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WO2012086265A1 - Produit absorbant et article absorbant - Google Patents

Produit absorbant et article absorbant Download PDF

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Publication number
WO2012086265A1
WO2012086265A1 PCT/JP2011/069663 JP2011069663W WO2012086265A1 WO 2012086265 A1 WO2012086265 A1 WO 2012086265A1 JP 2011069663 W JP2011069663 W JP 2011069663W WO 2012086265 A1 WO2012086265 A1 WO 2012086265A1
Authority
WO
WIPO (PCT)
Prior art keywords
liquid
absorption
absorber
recess
receiving layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2011/069663
Other languages
English (en)
Japanese (ja)
Inventor
玲子 大西
京子 石橋
辻　誠
長原　進介
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kao Corp
Original Assignee
Kao Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kao Corp filed Critical Kao Corp
Priority to RU2013134459/12A priority Critical patent/RU2560916C2/ru
Priority to CN201180060691.9A priority patent/CN103260570B/zh
Priority claimed from JP2011186765A external-priority patent/JP5889577B2/ja
Priority claimed from JP2011186764A external-priority patent/JP2012143534A/ja
Publication of WO2012086265A1 publication Critical patent/WO2012086265A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A61F13/535—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes
    • A61F13/536—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes having discontinuous areas of compression
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/531—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad
    • A61F13/532—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad
    • A61F13/533—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad having discontinuous areas of compression

Definitions

  • the present invention relates to an absorbent body and an absorbent article.
  • absorbent articles such as disposable diapers
  • the material and structure of each member have been improved to improve its function and feeling of wear.
  • the absorbent body applied to the absorbent article has also been developed with the aim of such improvement, and in recent years, various ones having functionality according to the use situation and the type of the article have been proposed.
  • an absorber made up of a large number of individual absorbent parts is arranged between the top sheet and the back sheet and in the plane direction, and an intermediate sheet is arranged between the absorber and the back sheet.
  • An absorbent article is disclosed.
  • This intermediate sheet has a function of drawing the liquid drained into the absorbent article and a function of diffusing the liquid, and fixes the absorbing portion through a fixing point.
  • This fixing point is, for example, ultrasonic embossing or hot melt adhesive. Therefore, the absorber and the intermediate sheet have an interface between them and are not integrally molded.
  • Patent Document 2 includes a tuft area that is a low-density area that is not substantially densified, and a channel that separates and surrounds the tuft area from each other, and the tuft area and the channel are continuous.
  • An absorbent pad is disclosed.
  • the channel includes a storage area and a transport area, the storage area having a density greater than the tuft area, and the transport area having a density greater than the storage area.
  • the transport area is separated and surrounded by a storage area. Thereby, the penetration capability is improved and softness is imparted.
  • the absorbent portion is arranged and fixed to the intermediate sheet via a fixed portion having a smaller area than the absorbent portion. Therefore, the absorbent article is attached to perform an operation such as walking.
  • the absorber may “sway” and the absorbent part may float, and in either case, there was a sense of incongruity.
  • the fixed portion is interposed between the intermediate sheet and the absorbent portion and has an interface, diffusion from the intermediate sheet to the absorber may be hindered by the fixed portion and the interface, and may be insufficient. The absorption performance of the absorber was not sufficiently drawn out.
  • the disposable diaper disclosed in Patent Document 3 includes a liquid-permeable top sheet, a liquid-impervious back sheet, and a liquid-absorbent core interposed between the two sheets. It has a front waistline region, a back waistline region, and a crotch region located between both regions, and absorbs along a virtual line extending from the front waistline region to the back waistline region via the crotch region. At least a part of the liquid core is divided.
  • the liquid-absorbent core is disposed between the fiber layer and the first fiber layer and the second fiber layer containing pulverized pulp as a main component and containing 1 to 10% by mass of the superabsorbent polymer particles.
  • the first and second fiber layers and the particle layer except for the side surfaces of the liquid-absorbing core in the divided portions, and the surface sheet is a side surface between the side surfaces of the liquid-absorbing core that is divided and opposed to each other.
  • the front and back sheets are joined to each other at the contact portion.
  • the body fluid is not only absorbed from the top surface of the absorbent core, but also directly absorbed from the side surface of the absorbent core into the particle layer and the fiber layer located below the particle layer.
  • the paper diaper disclosed in Patent Document 4 includes a water-absorbing polymer excellent in water absorption for artificial urine under load in the absorber. However, since a plurality of grooves are not arranged in the absorber, it has been difficult to achieve a high absorption rate.
  • Patent Document 5 as an absorbent article, an abdominal panel that can be bent between panels, a crotch panel, a back panel, and an outer edge panel are arranged at intervals, and each panel is a single absorbent core panel as a whole. Is held as. Each panel is configured to be able to bend in the front, rear, left and right directions independently within each panel surface. Therefore, as shown in FIG. 33, gaps C1 and C2 may be generated between the skin surfaces 120S of the model 120 at the bent portions B1 and B2 between the panels 121 and 122 and between the panels 121 and 122 when worn. is there.
  • the object of the present invention is to improve the feeling of wearing and improve liquid diffusibility and liquid absorbency while maintaining excellent body compatibility even when walking or sitting. Further, it is an object of the present invention not to significantly reduce these performances even in repeated excretion.
  • the present invention is divided into a first absorbent part of an intermediate part in which the absorbent body is divided into three in the longitudinal direction, a second absorbent part divided on one side of the first absorbent part, and a second absorbent part on the other side of the first absorbent part
  • Each of the absorbing parts is continuous with the liquid receiving layer part on one side of the liquid receiving layer part, and a liquid receiving layer part that absorbs the liquid and diffuses in the plane direction.
  • a projecting liquid absorption storage section that is separately distributed and absorbs and stores the liquid, and has a recess recessed in a groove shape on one surface or in a position opposite to both surfaces,
  • the concave portion is disposed between the projecting liquid absorbing and storing portions, and the first concave portion disposed in the first absorbing portion is disposed in the longitudinal direction inside the outer edge of the first absorbing portion in plan view, and 2, the second and third recesses arranged in each of the third absorption parts are respectively arranged obliquely with respect to the longitudinal direction, and the same as the first and second recesses.
  • the first and third recesses are formed as continuous recesses, or the first recess, the second recess, and the third recess are separated from each other, and the protruding liquid absorption storage part is more than the recess.
  • the liquid receiving layer portion at the bottom of the concave portion solves the above problems by an absorbent body having a lower basis weight and density than the protruding liquid absorption storage portion.
  • the absorbent body of the present invention is capable of diffusing liquid over a wide range by improving liquid diffusibility, and also diffusing the liquid supplied to the absorbent body in the plane direction with a low-density liquid receiving layer part, Since the diffused liquid can be absorbed and stored in a high-density protruding liquid absorption storage part that is continuous with the liquid receiving layer part, the amount of liquid absorption increases and the absorption performance can be improved.
  • each absorption part is easy to change so as to fit the body shape well by the second and third recesses while expressing softness such as flexibility by the first recess, and the necessity for the skin surface of each absorption part Because the adhesion at the part to be raised is improved, it is excellent in body shape compatibility even when walking or sitting.
  • the absorbent article of the present invention is excellent in body conformity even when walking or sitting because the adhesiveness at the required portion of each absorbent portion with respect to the skin surface is enhanced.
  • the side edge part of an absorber becomes easy to fit a shading part by a 1st recessed part, the side leakage of the liquid supplied to the 1st absorption part can be prevented.
  • the upper surface side of the protruding liquid absorption storage part is arranged on the skin contact surface side, and the liquid receiving layer part side is on the non-skin contact surface side By arranging, the feeling of stickiness to the skin can be reduced. Furthermore, since the protruding liquid absorption storage part is continuous with the liquid receiving layer part, it is reduced that the protruding liquid absorption storage part is lifted, and the protruding liquid absorption storage part is not lifted. Is eliminated and the feeling of wearing becomes better.
  • the absorbent body 10 (10A) of the present invention includes a liquid-receiving layer part 31 that once receives a liquid, and a continuous surface of the liquid-receiving layer part 31 on one side of the liquid-receiving layer part 31. And it has the protrusion liquid absorption storage part 32 distribute
  • the protruding liquid absorption storage part 32 and the recessed part 20 are arranged so that the area ratio of the plurality of protruding liquid absorption storage parts 32 is higher than the area ratio of the recessed part 20.
  • the area ratio will be described in detail later.
  • the plurality of protruding liquid absorption storage portions 32 absorb and store the liquid diffused in the liquid receiving layer portion 31.
  • the plurality of protruding liquid absorption storage parts 32 absorb and store the liquid from the part that directly contacts the liquid.
  • the density of the protruding liquid absorption storage part 32 is higher than the density of the liquid receiving layer part 31 below the protruding liquid absorption storage part 32. Therefore, the protruding liquid absorption storage part 32 absorbs liquid from the liquid receiving layer part 31 by capillary force.
  • the basis weight of the liquid receiving layer portion 31 is preferably 10 g / m 2 or more and 300 g / m 2 or less, more preferably 30 g / m 2 or more and 200 g / m 2 or less, and particularly preferably 40 g / m 2 or more. 150 g / m 2 or less.
  • the basis weight of the protruding liquid absorption storage part 32 is higher than the basic weight of the liquid receiving layer part 31 in the recess as the total basic weight of the liquid receiving layer part 31 in contact with the protruding liquid absorption storage part 32, preferably Is 200 g / m 2 or more and 800 g / m 2 or less, more preferably 300 g / m 2 or more and 700 g / m 2 or less, and particularly preferably 400 g / m 2 or more and 600 g / m 2 or less.
  • the basis weight of the protruding liquid absorption storage part 32 can be calculated from the difference in basis weight of the liquid receiving layer part 31 in the recess.
  • the basis weight of the protruding liquid absorption storage unit 32 is 100 g / m 2 or more and 600 g / m 2 or less, preferably 200 g / m 2 or more and 600 g / m 2 or less, more preferably 300 g / m 2 or more and 600 g / m 2. 2 or less.
  • the density of the liquid receiving layer portion 31 is preferably 0.01 g / cm 3 or more and 0.09 g / cm 3 or less, more preferably 0.02 g / cm 3 or more and 0.07 g / cm 3 or less. If the basis weight of the liquid receiving layer part 31 is too low, the diffusibility in the liquid receiving layer part 31 is low, the liquid accumulates in the vicinity of the urination part, the liquid return amount becomes large, and the liquid easily leaks. If the basis weight of the part 31 is too high, the liquid will not easily move to the protruding liquid absorption storage part 32 and the liquid will easily return.
  • the density of the liquid receiving layer part 31 is too low, the capillary force does not work sufficiently, the diffusibility in the liquid receiving layer part 31 decreases, the liquid accumulates in the vicinity of the urination part, and the liquid return amount increases. It becomes easy to leak.
  • the density of the liquid receiving layer portion 31 is too high, voids in the liquid receiving layer portion 31 are reduced, so that the amount of liquid to be diffused is reduced and the amount of liquid delivered to the protruding liquid absorption storage portion 32 is reduced. And it becomes easy to leak.
  • the density of the protruding liquid absorption storage part 32 is higher than the density of the liquid receiving layer part 31, preferably 0.03 g / cm 3 or more and 0.3 g / cm 3 or less, more preferably 0.05 g / cm 3. 3 or more and 0.2 g / cm 3 or less, particularly preferably 0.06 g / cm 3 or more and 0.15 g / cm 3 or less.
  • the density of the protruding liquid absorption storage part 32 is too low, the capillary force hardly acts and it is difficult to guide the liquid that has passed through the liquid receiving layer part 31 to the protruding liquid absorption storage part 32 and it is difficult to hold the liquid. .
  • the density of the protruding liquid absorption storage part 32 is higher than that of the liquid receiving layer part 31 and set in the above range.
  • the measuring method of basic weight and a density is mentioned later.
  • the shape of the protruding liquid absorption storage part 32 is not particularly limited, and an arbitrary shape can be adopted.
  • the liquid receiving layer portion 31 and the protruding liquid absorption storage portion 32 are composed of pulp fibers and a superabsorbent polymer (SAP), and the contours thereof are not regular as shown in the figure. It is preferable that the whole is a three-dimensional shape. Further, the vertical and horizontal arrangements of the protruding liquid absorption storage unit 32 are not limited, and are preferably determined as appropriate according to the application.
  • the protrusion liquid absorption storage part 32 has a rectangle or trapezoid which is long in the width direction in the longitudinal section, and the area of the surface 32S on the skin contact surface side is the area of the back surface 32B on the non-skin contact surface side. Are the same or smaller.
  • the absorbent body 10 of the present embodiment is configured by a set of a large number of separated protruding liquid absorption storage portions 32, the “body compatibility” that fits the undulations on the skin surface is a normal large-sized absorbent body (continuous). Significantly higher than that of the absorber.
  • the “tracking ability” that follows the wearer's movement satisfactorily and prevents a partial gap from occurring on the skin is extremely good. According to the present embodiment, it is possible to achieve both such good deformability and good absorption and retention of liquid and the like that are not affected by the deformation.
  • the absorber 10 repeats the excretion from the initial excretion, so that the liquid is spread to a wider range, for example, the entire region of the liquid receiving layer 31 or a region close to the entire region by the diffusion action of the liquid receiving layer 31. Spread. Then, the liquid can be absorbed from the liquid receiving layer portion 31 by using the protruding liquid absorption storage portion 32 in the diffused region. Therefore, the amount of liquid absorbed by the absorber 10 is greatly improved.
  • the absorption amount of the conventional absorbent body (see Patent Document 1) in which the protruding liquid absorption storage unit is independently arranged is reduced by repeating the discharge from the first discharge.
  • the protruding liquid absorption storage parts are separated from each other, so that the liquid does not easily transfer between the protruding liquid absorption storage parts, thereby lowering the liquid permeability, and in particular the liquid transfer from the drainage part to other parts.
  • This is thought to be due to the fact that it may not be performed sufficiently.
  • the range of use stays in a narrow area around the drainage section and its surroundings, and a large amount of liquid that exceeds the absorption amount is liable to cause liquid return and leakage.
  • the excretory part is a part directly receiving excretion of urine, soft stool, menstrual blood or vaginal discharge in the absorber and its vicinity.
  • the basic weight and density of each part of the above-mentioned absorber 10 are obtained as follows.
  • the basis weight in the planar direction of the absorbent body 10 is obtained as follows. First, when the absorber 10 is viewed in plan, the protruding liquid absorption storage part 32 and the lower liquid receiving layer part 31 are cut out integrally, and the liquid receiving layer part 31 of the concave part 20 is cut out to obtain a mass and a planar size. (Area) is measured and the basis weight is calculated. Moreover, the basic weight of the thickness direction of the absorber 10 is calculated
  • the protruding liquid absorption storage part 32 on the liquid receiving layer part 31 is cut out, the mass and the planar size (area) are measured, and the basis weight is calculated.
  • the difference from the basis weight of the liquid receiving layer portion 31 of the recess 20 measured previously is the basis weight of the protruding liquid absorption storage portion 32.
  • the basis weight of the liquid receiving layer portion 31 below the protruding liquid absorption storage portion 32 is equal to the basis weight of the liquid receiving layer portion 31 below the concave portion 20 adjacent thereto.
  • the thickness of the liquid receiving layer portion 31 and the protruding liquid absorption storage portion 32 is the same as that of the liquid receiving layer portion 31 and the liquid receiving portion in the recess 20 from cross-sectional observation using a microscope [Microscope manufactured by Keyence (trade name: VHX-1000)).
  • the area ratio of each of the plurality of protruding liquid absorption storage portions 32 and the recesses 20 is obtained as follows. Using the above-mentioned microscope, focusing on the concave portion 20, measuring a range including one or more protruding liquid absorption storage portions 32 and the concave portion 20, binarizing the concave portion from the image, and using the image processing apparatus, the area of the concave portion The ratio is derived, and the difference is the area ratio of the protruding liquid absorption storage unit 32. If necessary, use manual correction of the image analyzer. It is preferable to image the entire absorber at once and obtain the area ratio using an image analysis device.
  • a pixel (pixel) Sb of the protruding liquid absorption storage unit 32 in a predetermined region.
  • ⁇ Sb the sum ⁇ St of the pixels (pixels) St of the recess 20, or the sum ⁇ Sb + ⁇ St of the absorber pixels (pixels)
  • the area ratio is calculated, or the representative area ratios of parts having different area ratios
  • the area ratio of the protruding liquid absorption storage unit 32 is ⁇ Sb / ( ⁇ Sb + ⁇ St), and the area ratio of the recess 20 can be calculated by ⁇ St / ( ⁇ Sb + ⁇ St).
  • the area ratio is set so that the area ratio of the protruding liquid absorption storage section 32 is higher than the area ratio of the recess 20.
  • the area ratio of the recess 20 is 100%-[area ratio (%) of the protruding liquid absorption storage section 32].
  • the area ratio of the protruding liquid absorption storage unit 32 is set to 60% to 95%, preferably 60% to 90%, more preferably 65% to 90%, more preferably 70%. It is set to 85% or less. If the area ratio of the protruding liquid absorption storage part 32 is too high, the area ratio of the recess 20 becomes too low, and the amount of liquid absorbed from the bottom of the recess 20 to the liquid receiving layer part 31 decreases, and the liquid receiving layer part.
  • the diffusion of the liquid to the entire region 31 is insufficient.
  • the area ratio of the protruding liquid absorption storage unit 32 is too low, the amount of liquid that can be stored in the protruding liquid absorption storage unit 32 decreases, and the amount of liquid absorbed as the absorber 10 decreases. Therefore, it is desirable that the area ratio of the protruding liquid absorption storage unit 32 be in the above range.
  • the liquid 61 passing through the recess 20 is diffused and absorbed from the side surface of the protruding liquid absorption storage unit 32 into the protruding liquid absorption storage unit 32.
  • the liquid 61 diffused in the liquid receiving layer portion 31 is diffused from the liquid receiving layer portion 31 into the protruding liquid absorption storage portion 32 by capillary force. In this way, the liquid 61 is stored inside the protruding liquid absorption storage section 32. Since most of the liquid 61 supplied to the surface of the absorbent body 10 diffuses inside the liquid receiving layer portion 31, the protruding liquid absorption storage portion 32 side is defined as the skin contact surface side, and the liquid receiving layer portion 31 side. By using the absorbent body 10 on the non-skin contact surface side, the liquid 61 can be diffused in the liquid receiving layer portion 31 far from the skin side. As a result, the effect of reducing the feeling of stickiness on the skin can be obtained.
  • the density of the protruding liquid absorption storage part 32 is higher than the density of the liquid receiving layer part 31, most of the liquid supplied to the absorbent body 10 has a low density liquid receiving layer. It penetrates into the portion 31 and diffuses in the liquid receiving layer portion 31, and is absorbed and stored by the capillary force from the liquid receiving layer portion 31 into the high-density protruding liquid absorption storage portion 32. Moreover, since the protruding liquid absorption storage part 32 is arranged continuously from the liquid receiving layer part 31, the diffusibility due to the presence of the interface when the liquid diffuses from the liquid receiving layer part 31 to the protruding liquid absorption storage part 32.
  • the liquid taken in the liquid receiving layer portion 31 without being lowered is smoothly absorbed and stored in the protruding liquid absorption storage portion 32 having a high density by capillary force. Thereby, the absorption performance (absorption amount and absorption speed) of the absorber 10 can be improved.
  • the area ratio of the plurality of protruding liquid absorption storage sections 32 is higher than the area ratio of the recesses 20 arranged between the respective protruding liquid absorption storage sections 32, the amount of liquid absorbed in the protruding liquid absorption storage section 32 is reduced. It can be secured sufficiently.
  • the absorbent article (not shown) on which the absorbent body 10 is disposed is mounted by arranging a plurality of protruding liquid absorption storage portions 32 so that a part of the absorbent body 10 is blocked.
  • the advantage that the adhesion (fitness) to the skin is improved is maintained.
  • the protrusion liquid absorption storage part 32 and the liquid receiving layer part 31 form a continuous body, the protrusion liquid absorption storage part 32 is reduced from being swung by a movement of the wearer or the like and prevented from floating.
  • the uncomfortable feeling at the time of wearing is eliminated, and the feeling of wearing is remarkably improved.
  • the absorbent body 10 (10B) of the second embodiment is similar to the absorbent body 10 (10A) of the first embodiment described above, and the liquid receiving layer portion 31, the protruding liquid absorption storage portion 32, and A recess 20 is disposed. Further, the protruding liquid absorption storage part 32 and the concave part 20 are arranged so that the area ratio of the plurality of protruding liquid absorption storage parts 32 is higher than the area ratio of the concave part 20. Further, the density of the protruding liquid absorption storage part 32 is higher than the density of the liquid receiving layer part 31 below, and closer to the density of the liquid receiving layer part 31 at the bottom of the recess 20 than the liquid receiving layer part in the first embodiment. ing.
  • the protruding liquid absorption storage part 32 can more easily accept the liquid from the liquid receiving layer part 31 by using the capillary force, and more easily absorb the liquid. Furthermore, the density of the liquid receiving layer part 31 at the bottom of the recess 20 is lower than the density of the protruding liquid absorption storage part 32. It is preferable that the density of the liquid receiving layer part 31 and the protrusion liquid absorption storage part 32 is set to the same value as that of the absorber 10 of the first embodiment described above. Thereby, it becomes easy to absorb the liquid from the liquid receiving layer portion 31 at the bottom of the recess 20.
  • the absorbed liquid diffuses in the liquid receiving layer portion 31 and is absorbed into the protruding liquid absorption storage portion 32 from the lower portion of the protruding liquid absorption storage portion 32, so that the liquid absorbability of the absorber 10B is further improved. .
  • the absorbent body 10 (10C) of the third embodiment is similar to the absorbent body 10 (10A) of the first embodiment described above, and the liquid receiving layer portion 31, the protruding liquid absorption storage portion 32, and A recess 20 is disposed. Further, the protruding liquid absorption storage part 32 and the concave part 20 are arranged so that the area ratio of the plurality of protruding liquid absorption storage parts 32 is higher than the area ratio of the concave part 20. Further, the density of the protruding liquid absorption storage part 32 is higher than the density of the liquid receiving layer part 31 below. Therefore, the protruding liquid absorption storage part 32 is easy to absorb the liquid from the liquid receiving layer part 31 using the capillary force.
  • the density of the side surface of the protruding liquid absorption storage part 32 is lower than the density of the central part of the protruding liquid absorption storage part 32. It is preferable that the density of the center part of the liquid receiving layer part 31 and the protrusion liquid absorption storage part 32 is made into the same value as the absorber 10 of the above-mentioned 1st Embodiment. Further, the density of the side surface of the protruding liquid absorption storage part 32 is set to a value equivalent to the density of the liquid receiving layer part 31 or higher than the density of the liquid receiving layer part 31. It is preferable that the value be lower than the density of the central portion of 32.
  • the protruding liquid absorption storage unit 32 has a trapezoidal vertical cross section, but may be rectangular. Moreover, it is preferable to arrange
  • the absorbent body 10 (10D) of the fourth embodiment is similar to the absorbent body 10 (10A) of the first embodiment described above, and the liquid receiving layer portion 31, the protruding liquid absorption storage portion 32, and A recess 20 is disposed.
  • the protruding liquid absorption storage part 32 and the concave part 20 are arranged so that the area ratio of the plurality of protruding liquid absorption storage parts 32 is higher than the area ratio of the concave part 20.
  • the density on the upper side of the protruding liquid absorption storage part 32 is higher than the density of the liquid receiving layer part 31 below. Therefore, the protruding liquid absorption storage part 32 is easy to absorb the liquid from the liquid receiving layer part 31 using the capillary force.
  • the liquid-receiving layer portion 31 at the bottom of the concave portion 20 has a larger basis weight at the outer side than the central portion in the longitudinal direction.
  • the basis weight of the outer portion becomes larger than the central portion in the longitudinal direction. It is like that.
  • the thickness of the liquid receiving layer portion 31 may be increased (the depth of the concave portion 20 is reduced), and in order to reduce the basis weight, the thickness of the liquid receiving layer portion 31 is decreased ( What is necessary is just to deepen the depth of the recessed part 20).
  • the liquid taken into the liquid receiving layer portion 31 is easily drawn into the outer portion of the absorber 10D.
  • the absorbent body 10D is applied to a diaper as an absorbent article, the liquid excreted is taken in at the central portion of the liquid-receiving layer portion 31 and drawn into both outer portions, so that the amount of taken-in liquid is increased.
  • the absorbed liquid can be absorbed by the protruding liquid absorption storage part 32 in the entire absorber 10D, so that the amount of absorption can be improved.
  • the density of the liquid receiving layer portion 31 at the bottom of the concave portion 20 is lower than the density of the protruding liquid absorption storage portion 32 as in the second embodiment.
  • the density of the side surface of the protrusion liquid absorption storage part 32 may be lower than the density of the center part of the protrusion liquid absorption storage part 32 like the above-mentioned 3rd Embodiment.
  • the absorbent body 10 When the absorbent body 10 is used so that liquid is supplied from the protruding liquid absorption storage section 32 side, a large amount of liquid (particularly liquid with a low viscosity of 5 mm ⁇ Pa ⁇ sec or less such as urine) is discharged. Sometimes the liquid is guided along the recess 20 in the longitudinal direction. This is an effect due to the shape (concave portion) recessed from one surface of the absorbent body 10, and is a result of the liquid flowing into the concave portion 20 and the function as a water channel (see FIG. 8 (1)).
  • the projecting liquid of the absorbent body 10 is used.
  • the top sheet 16 is disposed on the absorption storage section 32 side, and the back sheet 17 is disposed so as to be bonded around the top sheet 16 and so as to wrap around the liquid receiving layer section 31 side of the absorbent body 10. do it.
  • the top sheet 16 is preferably formed of a hydrophilic nonwoven fabric.
  • the hydrophilic nonwoven fabric is an air-through nonwoven fabric, a point-bonded nonwoven fabric, a spunbonded nonwoven fabric, a spunlace nonwoven fabric, and a three-dimensionally shaped nonwoven fabric.
  • a fiber that has been subjected to a hydrophilic treatment with a composite fiber of polyethylene terephthalate and polyethylene can be preferably used.
  • the back sheet 17 is not particularly limited as long as it has waterproofness and moisture permeability.
  • a film is formed by melt-kneading a hydrophobic thermoplastic resin, a fine inorganic filler made of calcium carbonate or the like or an incompatible organic polymer, and the film is obtained by uniaxial or biaxial stretching.
  • a porous film is mentioned.
  • the thermoplastic resin include polyolefin.
  • the polyolefin include high to low density polyethylene, linear low density polyethylene, polypropylene, polybutene and the like, and these can be used alone or in combination.
  • the skin contact surface side of the absorbent body 10 is covered with a covering sheet. Furthermore, not only the skin contact surface side but also the non-skin contact surface side may be covered with the covering sheet, or the absorbent body 10 may be covered with the covering sheet. Furthermore, it is preferable that a pair of side sheets forming an inner three-dimensional gather is laminated on the skin contact surface side of the top sheet 16. Furthermore, it is preferable that the back sheet 17 and the leak-proof sheet are provided in this order on the non-skin contact surface side.
  • the absorbent body 10 of the present invention is composed of three parts in the longitudinal direction L of the absorbent body 10. Specifically, the first absorption part 11 divided into the intermediate part, the second absorption part 12 arranged on one side of the first absorption part 11, and the other side of the first absorption part 11 are arranged. And a third absorption portion 13. Therefore, the first absorption part 11 is arranged between the second absorption part 12 and the third absorption part 13.
  • the outer shape of the absorbent body 10 may be rectangular, but more preferably, the width direction d (hereinafter referred to as the width direction d is the above) so as to fit the thigh portion of the wearer's thigh.
  • the 1st, 2nd, 3rd absorption part 11,12,13 only displayed the area
  • the first absorbent portion 11 is disposed on the crotch portion, for example, the second absorbent portion 12 is disposed on the ventral side, and the third The absorption part 13 is arranged on the back side.
  • the 2nd absorption part 12 is arranged on the back side
  • the first absorbent portion 11 is provided with a plurality of first concave portions 21 (two first concave portions 21 in the drawing), and each first concave portion 21 is inside the side periphery of the first absorbent portion 11 in plan view. It is arranged in the longitudinal direction L.
  • a plurality of first recesses 21 are arranged in the first absorption part 11, and only the first recesses 21 are arranged in the first absorption part 11.
  • it includes a case where the second concave portion 22 and the third concave portion 23 are partially arranged.
  • the phrase “arranged in the longitudinal direction L” includes not only the case of being arranged only in the longitudinal direction L but also the case of being arranged in some other direction.
  • second and third recesses 22 and 23 are arranged in each of the second and third absorption parts 12 and 13, and each of the second and third recesses 22 and 23 is arranged in an oblique direction with respect to the longitudinal direction L.
  • the second and third recesses 22 and 23 are arranged in the second and third absorption parts 12 and 13, respectively, when only the second and third recesses 22 and 23 are arranged.
  • the case where the 1st recessed part 21 is partially arranged is included. It means that it may be arranged in an oblique direction and may be partially arranged in other directions. As a specific example of the oblique direction, it is arranged in an oblique lattice shape as shown in the figure. Accordingly, the first recess 21 is different from the second and third recesses 22 and 23 in the arrangement of the recesses.
  • the above oblique direction is defined as follows.
  • the measurement starting point is the midpoint position of the portion where the longitudinal center axis CL parallel to the width direction d passing through the longitudinal center of the absorbent body 10 (position of half the longitudinal length) and the first recess 21 intersect.
  • the straight line that passes the longest through the first recess 21 is defined as the first line.
  • the end of the second recess 22 to be measured that is closest to the edge of the absorbent body 10 is set as the measurement starting point, and the straight line that passes through the second recess is longest.
  • the second line direction when the first line and the second line have an intersection angle is defined as an “oblique direction”.
  • intersection angle ends at the first line of the first recess 21 that is closest to the edge of the first absorption portion 11 and the position that is closest to the first absorption portion 11 and closest to the widthwise edge of the second absorption portion 12.
  • the intersection angle is preferably 10 ° or more and 80 ° or less, more preferably 30 ° or more and 70 ° or less, and most preferably 40 ° or more and 60 ° or less. If the crossing angle is less than 10 °, the abdominal part and the concave part of the back part are arranged in parallel with respect to the longitudinal direction of the absorber. For this reason, a gap is generated between the abdomen and the absorbent body, which easily induces leakage and is inappropriate.
  • FIG. 9 shows an example in which the first concave portion 21 and the second and third concave portions 22 and 23 are arranged in a continuous line shape. In the same manner as described above, the first line and the second line can also be defined.
  • FIG. (1) When the end of the first recess 21 is linear and the second recess 22 of the connection portion with the first recess 21 is linear, the extension line of the first recess 21 and the second recess 22 form.
  • the angle ⁇ is 0 ° ⁇ ⁇ 90 ° or 0 °> ⁇ > ⁇ 90 °.
  • the positive angle means a case where the angle with the second concave portion 22 exists outside the extended line of the first concave portion 21, and the negative angle means an inside of the extended line of the first concave portion 21.
  • the case where there exists an angle with the 2nd recessed part 22 is said.
  • the outer side refers to the end side in the width direction d of the absorbent body 10
  • the inner side refers to the center side of the absorbent body 10 in the width direction d. The same applies hereinafter.
  • the tangent of the first recess 21 at the connection with the second recess 22 And the second recess 22 is 0 ° ⁇ ⁇ > ⁇ 180 ° or 0 ° ⁇ ⁇ ⁇ 180 °.
  • the positive angle means a case where the angle with the second recess 22 exists outside the tangent line of the first recess 21, and the negative angle means that the angle inside the extension line of the first recess 21 is inside. The case where there exists an angle with 2 recessed part 22 is said.
  • the tangent line of the first recess 21 at the connection with the second recess 22 is 0 ° ⁇ ⁇ 180 ° or 0 ° ⁇ ⁇ > ⁇ 180 °.
  • the positive angle means a case where the angle with the tangent of the second recess 22 exists outside the tangent of the first recess 21, and the negative angle means an inside of the tangent of the first recess 21.
  • a line passing through the center position of each width is a line representative of each recess.
  • the extension line of the first recess 21 means a line obtained by extending a line passing through the center of the first recess 21 in the width direction.
  • the tangent line of the first recess 21 means a tangent line passing through the center of the first recess 21 in the width direction.
  • connection portion between the first recess 21 and the second recess 22 a connection point between a line passing through the center in the width direction of the first recess 21 and a line passing through the center in the width direction of the second recess 22. (For example, an intersection or a contact).
  • the angular relationship is satisfied.
  • each of the above relations is the same as above when one or more of the first concave portion 21, the second concave portion 22, and the third concave portion 23 are distributed in a broken line shape or intermittently.
  • the positional relationship is as follows. In this case, the lines defining the angles are those extrapolated lines.
  • the first recess 21 may be partly disposed on the second and third absorption parts 12 and 13.
  • a part of the second recess 22 is arranged on a part of the first absorption part 11.
  • a part of the first recess 21 is arranged on a part of the second absorption part 12.
  • the third absorber 13 For example, if the boundary between the first and third absorption parts 11 and 13 is a C line, a part of the third recess 23 is arranged on a part of the first absorption part 11.
  • the boundary between the first and third absorption parts 13 is a D line
  • a part of the first recess 21 is arranged on a part of the third absorption part 13.
  • the arrangement relationship of the recesses with respect to the respective absorption units varies depending on the set position of the boundary between the first absorption unit 11 and the second and third absorption units 12 and 13.
  • the boundary of each absorption part is A line and C line was shown as an example.
  • first and second recesses 21 and 22 and the first and third recesses 21 and 23 are configured as continuous recesses.
  • the cross-sectional shape of the first to third recesses 21 to 23 (hereinafter referred to as the first to third recesses 21 to 23) is not limited, but is rectangular or inverted trapezoidal.
  • the absorber 10 is comprised with aggregates, such as a fiber like a nonwoven fabric, the outline of the cross-sectional shape of each recessed part is not decided, but is an approximate shape.
  • the second and third concave portions 22 and 23 are arranged in an oblique direction with respect to the longitudinal direction, and the second concave portion 22 is inside the second absorbent portion 12 in plan view, and the third concave portion More preferably, 23 is inside the third absorption portion 13 in plan view.
  • the first recess 21 is arranged as described above. Therefore, the outer edge portion of the absorbent body 10 is surrounded by the protruding liquid absorption storage portion 32.
  • the minimum distance dm between the outer edge of the absorbent body 10 and the outer edge edge of each of the second concave portion 22 and the third concave portion 23 is appropriately determined, and is, for example, 5 mm to 50 mm, preferably 5 mm to It is 40 mm, more preferably 5 mm to 30 mm.
  • the first concave portion 21 is arranged in the longitudinal direction L, so that liquid with low viscosity such as excreted urine (5 mPa ⁇ sec or less) is liquid along the concave portion. Is guided in the longitudinal direction. This is an effect due to the shape depressed from one surface of the absorber, and is likely to occur particularly when the amount of liquid to be discharged is large. When a depression is formed on the side of the drainage surface, the liquid will reach the depression and the concave portion will function as a water channel.
  • the 1st recessed part 21 is distribute
  • arranged to a crotch part is pressed inside by the sticking part inside a thigh at the time of wear.
  • the 1st absorption part 11 is bent by the 1st recessed part 21 so that the skin surface side of the absorber 10 may follow a wearer's skin surface, and a clearance gap (space of a wearer's skin and an absorber) is centered in the width direction. It becomes easier to form.
  • a part of the first recess 21 arranged in the second and third absorption parts 12, 13 are arranged toward the end face side in the width direction d, and the absorber 10 in that portion is easily bent by the first recess 21 and the second recess 22 or the third recess 23.
  • the central axis C is a line along the longitudinal direction that passes through a half position in the width direction (d direction) passing through a half position in the longitudinal direction of the absorbent body 10. From the point of preventing each absorbing portion from floating in a straight line in the direction parallel to the central axis C, the intersecting portion 26 (shown by diagonal lines) indicated by the region where the third recesses 23 arranged in at least two directions described above intersect.
  • the intersecting portion 26 is a region where concave portions having different arrangement directions intersect with each other, and is a common region of the concave portions intersecting in this region. Therefore, only one common region exists on a line parallel to the central axis C. That is, two or more common regions do not exist on a line parallel to the central axis C. Thereby, each absorption part becomes easy to bend in each recessed part along a skin surface, and will be in the state which is easy to adhere
  • the first recess 21 is inside the absorbent body 10 in plan view and is arranged in the longitudinal direction L, a gap is formed at the center in the width direction, and a tucked portion inside the thigh at the side in the width direction.
  • the liquid is supplied to the first absorbent part 11 along the first absorbent part 11 without leaking the liquid in the width direction d of the first absorbent part 11, through the first recess 21 in the longitudinal direction L of the absorbent body 10. 3 It can be made to flow in the direction of 12 absorption parts 13 and 13. Therefore, the 1st recessed part 21 also has a role which prevents a side leak in the 1st absorption part 11.
  • the liquid diffusibility is improved while preventing the side leakage, and the liquid is diffused in the second and third absorbers 12 and 13, so that the liquid can be diffused in a wide range of the absorber 10.
  • the second and third absorbent parts 12 and 13 are each provided with a recess in the oblique direction with respect to the longitudinal direction L, for example, the absorbent body 10 of the present invention is worn by an infant who does yes. In this case, the liquid is easily diffused into the second absorption part 12 or the third absorption part 13 worn on the lower abdomen when yes is applied.
  • the liquid can be diffused over a wide range of the second and third absorption parts 12 and 13 by the second and third concave parts 22 and 23, and the diffused liquid can be diffused into the second and third concave parts 22 and 23. Since the absorber 10 arranged in the part absorbs, leakage from the abdomen can be prevented. Furthermore, since the first and second recesses 21 and 22 and the first and third recesses 21 and 23 are configured as continuous recesses, the liquid supplied to the first absorption unit 11 is It becomes easy for liquid to pass through the second and third recesses 22 and 23 from the nozzle 21. Also from this point, since the liquid diffusibility is improved, the liquid can be diffused in a wide range of the absorber 10.
  • the second and third recesses may be extended to the end of the peripheral edge of each absorbing portion as shown in the figure, but are not limited thereto.
  • the second recess 22 is inside the second absorption part 12 in plan view
  • the third recess 23 is inside the third absorption part 13 in plan view. 2. Since the liquid transmitted through the third concave portions 22 and 23 is blocked by the edge portions of the second and third absorbing portions 12 and 13, side leakage can be prevented.
  • the first absorption part 11 is narrower than the second and third absorption parts 12 and 13. That is, the absorber 10 is configured in a shape narrowed in plan view with respect to the second and third absorbers 12 and 13 in the first absorber 11. And it is preferable that the outer periphery of the 1st absorption part 11 and the 2nd, 3rd absorption parts 12 and 13 is comprised in the continuous shape.
  • the concave portion is not disposed only on one surface of each absorption portion, but a concave portion that is recessed in a concave shape is disposed at a position where both surfaces of each absorption portion face each other. Also good.
  • the structure which the 1st recessed part 21, the 2nd recessed part 22, and the 3rd recessed part 23 spaced apart may be sufficient.
  • the first recess 21 and the second recess 22 may be spaced apart
  • the first recess 21 and the third recess 23 may be spaced apart.
  • the absorbent body 10 of the present invention changes the shape of each absorbent portion along the body shape while maintaining softness, the gap forming property at the crotch center with respect to the skin surface of each absorbent portion and the crotch side Since the adhesion of the part is enhanced, it is excellent in body shape compatibility even when walking or sitting, and a comfortable wearing feeling can be obtained.
  • the absorbent body 10 includes a concave portion for diffusing liquid in a plane direction, a liquid receiving layer portion 31 for temporarily holding and transferring the liquid, and a continuous surface of the liquid receiving layer portion 31 on one surface side of the liquid receiving layer portion 31. And a plurality of protruding liquid absorption storage sections 32 that finally hold a plurality of separated liquids.
  • first to third recesses 21 to 23 are disposed between each protruding liquid absorption storage part 32 and another adjacent protruding liquid absorption storage part 32.
  • first recess 21 an example in which the first recess 21 is arranged is shown as a representative.
  • the second and third recesses 22 and 23 shown in parentheses have the same cross-sectional configuration as the first recess 21.
  • the absorbent body 10 having such a cross-sectional configuration is not divided by the first to third recesses 21 to 23, the liquid supplied into the first to third recesses 21 to 23 is the first to third recesses 21.
  • Osmose permeates the liquid receiving layer part 31 at the bottom of ⁇ 23, and is held by the liquid receiving layer part 31 at the bottom of the protruding liquid absorption storage part 32 disposed on the side of the first to third recesses 21-23.
  • the liquid that cannot be held by the liquid receiving layer portion 31 is discharged, the liquid is diffused by the concave portion, guided in the longitudinal direction, and temporarily held by the liquid receiving layer portion arranged there.
  • the retained liquid is absorbed from the liquid receiving layer portion 31 and stored in the protruding liquid absorption storage portion 32. Therefore, by setting the side on which the first to third recesses 21 to 23 are formed as the skin contact surface side, most of the liquid can be temporarily held at the position farthest from the skin surface. A feeling of stickiness on the contact surface side is suppressed, and a comfortable wearing feeling can be obtained.
  • the first example of the arrangement form of the recesses in plan view shows an example of the arrangement form of the first recesses 21, and as shown in FIG. 13, a plurality of first recesses 21 are long in the first absorption part 11. Arranged in the direction L.
  • the first concave portion 21 is arranged in the longitudinal direction L as a whole of the first concave portion 21, and is configured in a linear shape, a curved shape, a broken line shape, or the like as long as it is arranged at least inside the planar view absorber 10. Or a combination of some of them.
  • This first example is a basic form of the arrangement of the first recesses 21.
  • the first concave portion 21 is arranged in the longitudinal direction L, the liquid supplied to the first absorbing portion 11 is guided to the second and third absorbing portions 12 and 13 through the first concave portion 21. Nature is increased and it becomes easy to diffuse. That is, the diffusibility of the liquid is improved. Furthermore, the lateral end of the liquid supplied to the first absorption unit 11 can be prevented by the first recess 21 being bent by being lifted and bent in the width direction, with the side portions becoming relatively high and closely contacting.
  • the second example of the arrangement of the recesses in plan view includes a plurality of recesses of the second recesses 22 (in the illustrated example, the two second recesses 22 ⁇ / b> A and 22 ⁇ / b> B).
  • the first recess 21 is connected in the region A1 where the first recess 21 is disposed.
  • a plurality of recesses in the illustrated example, two third recesses 23A and 23B) of the third recesses 23 are located in the area A1 where the first recesses 21 (21A and 21B) are arranged. It is connected with.
  • the plurality of recesses of each of the second recesses 22 and the third recesses 23 are connected to each other in the region A1 in which the first recesses 21 are arranged, and thus are supplied to the first absorption unit 11.
  • the liquid easily diffuses from the region A1 where the first recess 21 is disposed to the second absorption part 12 through the second recess 22 and to the third absorption part 13 through the third recess 23. That is, the diffusibility of the liquid is improved.
  • the 2nd recessed part 22 and the 3rd recessed part 23 which are between 1st recessed parts 21A and 21B make gap formation in a crotch part easy, and the 2nd recessed part 22 and the 3rd recessed part 23 which are on the side from the 1st recessed part 21 are
  • the end of the absorbent body 10 bends in the recess while being in close contact with the body so as not to cause the above-described pressure on the groin area or hindrance to the movement of the thigh. Part and second and third absorption parts).
  • the end of the first concave portion 21 arranged in the first absorbing portion 11 extends to the second and third absorbing portions 12 and 13.
  • the second concave portion 22 may be connected to the second absorbent portion 12.
  • the third recesses 23 connected to the first recesses 21 may be connected to each other at the third absorption portion 13.
  • the 2nd, 3rd recessed parts 22 and 23 are with respect to the longitudinal direction L so that it may return to the 1st absorption part 11 side from the position connected with the 1st recessed part 21 in the 2nd and 3rd absorption parts 12 and 13. May be arranged in an oblique direction.
  • the arrangement form of the second and third depressions 22 and 23 will be described as a fourth example of the arrangement form of the depressions in plan view.
  • the second and third recesses 22 and 23 are arranged in an oblique direction with respect to the longitudinal direction L, and one end of the second recess 22 reaches the circumferential surface S2 of the second absorption unit 12, and One end of the three recesses 23 reaches the circumferential surface S3 of the third absorption portion 13.
  • the fourth example is a basic form of the arrangement form of the second and third recesses 22 and 23.
  • the inclination angle of the second and third recesses 22 and 23 with respect to the longitudinal direction L can be determined as appropriate depending on the form of the second and third recesses 22 and 23 because they can take various forms such as a straight line and a curved line. Is done.
  • the liquid is easily diffused to the entire area of the second and third absorbers 12 and 13 by the second and third recesses 22 and 23 arranged in this way. Further, when the absorbent body 10 having such a recessed portion arrangement is worn, the second absorbent portion 12 is bent by the second recessed portion 22, and the third absorbent portion 13 is bent by the third recessed portion 23. It becomes easy and it becomes easy to fit the 2nd absorption part 12 or the 3rd absorption part 13 to a shading part. Thereby, the uncomfortable feeling at the time of operation
  • the plurality of concave portions of the second concave portion 22 and the third concave portion 23 are connected to each other in the first concave portion 21 and the second and third absorbing portions 12 and 13, and the second concave portions 22 are connected to each other. Since the third recesses 23 are connected to each other, the liquid supplied to the first absorption unit 11 is transferred from the first recess 21 to the second absorption unit 12 through the second recess 22 and through the third recess 23 to the third. It becomes easy to diffuse to the absorption part 13. That is, the diffusibility of the liquid is improved.
  • the sixth example of the arrangement of the concave portions in plan view includes a plurality of first concave portions 21 (two first concave portions 21 ⁇ / b> A and 21 ⁇ / b> B in the drawing) arranged in a direction intersecting the longitudinal direction L.
  • a communication recess 24 that connects the first recesses 21 is disposed.
  • the number of the connecting recesses 24 is two in the illustrated example, the number of the connecting recesses 24 is preferably determined as appropriate.
  • the communication recessed part 24 is distribute
  • the inclination direction of the communication recess 24A and the communication recess 24B is the same direction.
  • the communication recess 24A and the communication recess 24B may be arranged in different directions and at different angles.
  • the inclination angle of the communication recess 24 with respect to the longitudinal method L is, for example, 45 °.
  • the angle is not limited to 45 °, and may be 30 ° or 60 °, and the angle is appropriately determined.
  • one connecting recess 24 may be disposed at a position where the liquid is supplied, and the other connecting recess 24 may be disposed outside the position where the liquid is supplied.
  • the connection recessed part 24 may be formed similarly to the 1st recessed part, it squeezes the liquid receiving layer part 31 and the protrusion liquid absorption storage part 32 from a viewpoint of the diffusibility of a liquid and the free formation of a shape.
  • the formed compression recessed part may be sufficient. In the squeezed recess, once the liquid retainability is lowered, in addition to the diffusibility at the time of discharging a large amount, it also has the diffusibility of the liquid once held in the liquid receiving layer 31.
  • the basis weight of the absorber 10 (liquid receiving layer portion 31) at the bottom of each of the second concave portion 22 and the third concave portion 23 is the first.
  • the basis weight of the absorbent body 10 (liquid receiving layer portion 31) at the bottom of the recess 21 is larger.
  • the basis weight of the outer portion is larger than the central portion in the longitudinal direction. .
  • the thickness of the liquid receiving layer portion 31 may be increased (the depth of the concave portion is reduced), and in order to reduce the basis weight, the thickness of the liquid receiving layer portion 31 is decreased (the concave portion). Deepen).
  • the basis weight of the liquid-receiving layer portion 31 at the bottom of the first recess 21 is 10 g / m 2 or more and 300 g / m 2 or less, preferably 30 g / m 2 or more and 200 g / m 2 or less, more preferably 40 g / m. 2 to 150 g / m 2 or less.
  • the basis weight of the liquid receiving layer 31 at the bottom of the second and third recesses 22 and 23 is 10 g / m 2 or more and 330 g / m 2 or less, preferably 40 g / m 2 or more and 230 g / m 2 or less. preferably a 50 g / m 2 or more 180 g / m 2 or less.
  • the basis weight of the liquid receiving layer portion 31 at the bottom of the second and third recesses 22 and 23 is 10 g / m 2 , more preferably 20 g / m 2 , more preferably 30 g / m2 than the basis weight of the first recess 21. m 2 or more is preferably high.
  • the basis weight of the liquid receiving layer 31 at the bottom of the first recess 21 is 50 g / m 2
  • the basis weight of the liquid receiving layer 31 at the bottom of the second and third recesses 22 and 23 is 100 g / m 2.
  • the liquid taken into the liquid receiving layer part 31 of the first absorption part 11 is easily drawn into the liquid receiving layer part 31 of the second absorption part 12 and the third absorption part 13.
  • a liquid drained by the liquid receiving layer portion 31 of the first absorbent portion 11 is taken in, and is taken into the second absorbent portion 12 and the third absorbent portion 13 on both sides.
  • the absorbent body 10 of the present invention is configured by combining some of the above-described concave portions. Therefore, the absorbent body 10 of the present invention is excellent in body shape compatibility even when walking or sitting while maintaining softness, and can improve the absorption performance of the entire absorbent body. In addition, it also has the effect of the recesses of the above-described forms. Furthermore, in the cross-sectional configuration, the absorbent body 10 of the present invention is formed by the liquid-receiving layer portion 31 and the protruding liquid absorption storage portion 32. The configuration has the above-described effects, but improves each function.
  • the liquid-receiving layer part 31 has a low final holding function, and it is preferable that the superabsorbent polymer has a lower density than the protruding liquid absorption storage part 32 or is not disposed.
  • the protruding liquid absorption storage unit 32 is preferably provided with a highly absorbent polymer in order to increase the holding function as compared with the liquid receiving layer part 31, and has a higher density than the liquid receiving layer part 31. More preferred. Note that the liquid receiving layer portion 31 does not have to be formed at the same density in all portions, and in the position overlapping with the protruding liquid absorption storage portion 32, the liquid may be higher in density than each concave portion.
  • the density is gradually increasing toward the center part of the protrusion liquid absorption storage part 32 from the periphery of the protrusion liquid absorption storage part 32. preferable.
  • the absorbent body 10 of the present invention has a pulp 41 and a water-absorbing polymer 42, and the mass ratio represented by [mass of pulp] / [mass of water-absorbing polymer] is 1/3. It is 1 / 0.01 or less, preferably 1 / 2.5 or more and 1 / 0.1 or less, more preferably 1/2 or more and 1 / 0.5 or less.
  • a water-absorbing polymer 42 is dispersed between pulps 41 that are formed by stacking fibers.
  • the water absorbing polymer 42 may be disperse
  • the water absorption amount of the water-absorbing polymer 42 is 30 g / g or more and 50 g / g or less, preferably 30 g / g or more and 45 g / g or less in terms of physiological saline in consideration of the absorbability of the liquid of the product.
  • they are 31 g / g or more and 40 g / g or less, Especially preferably, they are 32 g / g or more and 36 g / g or less.
  • the absorbent polymer 42 absorbs water and gels. In order to cause gel blocking, the liquid permeability between gels is deteriorated, and the absorption performance of the absorber is lowered. As shown in FIG. 20, in the absorbent body 10 having a recess (groove 20), even if the water-absorbing polymer 42 causes gel blocking to some extent, the groove 20 (liquid flow path) is not blocked and liquid permeability is ensured.
  • the water absorption amount of the water absorbent polymer 42 is set in the above range.
  • the absorption amount of the excretory liquid under a predetermined pressure is 20 g / g or more and 40 g / g or less, preferably 20 g / g or more under a pressure of 2 kPa. It is 35 g / g or less, more preferably 21 g / g or more and 30 g / g or less, and particularly preferably 22 g / g or more and 28 g / g or less.
  • the pressurization value of 2 kPa is an example of an average pressure when the baby pressurizes the absorbent body 10 when the absorbent body 10 is worn.
  • the crosslinking of the polymer is very strong and the gel strength is too high, and (2) the crosslinking of the polymer is very weak and the gel strength is low. May be too low.
  • the water-absorbing polymer itself is not easily crushed under pressure, but the ability to absorb the liquid of the water-absorbing polymer is insufficient, so that the amount of absorption under pressure is reduced, and the liquid is the absorber 10. It will not be absorbed inside but will spread and leak.
  • the water-absorbing polymer is easily crushed under pressure, and if gel blocking is caused beyond the extent, the absorption rate of the absorbent body 10 is slow, the liquid return amount is large, and the absorption capacity is reduced.
  • a water-absorbing polymer having a large amount of absorption under pressure generally has (1) very strong cross-linking of the polymer, and the water-absorbing polymer itself is not crushed under pressure, but the amount of water absorption is small.
  • the water-absorbing polymer 42 in which the amount of the excreted liquid absorbed under pressure is set in the above range is moderately cross-linked so that the water-absorbing polymer 42 itself is not easily crushed. Therefore, since the wearer's load is not crushed under the pressure applied to the absorbent body 10 under the condition that the liquid (for example, urine) is discharged, the water-absorbing polymer 42 protrudes inside the groove 20 to be described later and absorbs water.
  • channel 20 is block
  • a water-absorbing polymer having a low amount of water absorption under pressure tends to be inhibited from swelling if the packing density (corresponding to an uneven distribution state) is high even under a constant load, and the water absorption amount tends to decrease.
  • the swelling inhibition can be alleviated to some extent by the space of the recess (groove 20). Therefore, the lower limit of the absorption amount of the water-absorbing polymer 42 under a pressure of 2 kPa is set to the above range.
  • the water-absorbing polymer 42 absorbs too much pressure under pressure, the water-absorbing polymer 42 swells to a greater extent, and the recess (groove 20) is buried or closed, and the passage of liquid is repeatedly excreted. Since there is a possibility that it will not be ensured, the upper limit of the absorption amount under a pressure of 2 kPa is set to the above range.
  • the thickness of the absorber 10 is not less than 0.5 mm and not more than 20 mm. Preferably, they are 1 mm or more and 10 mm or less, More preferably, they are 1.5 mm or more and 5 mm or less. If the thickness of the absorbent body 10 is too thin, it will be difficult to secure a sufficient amount of absorption and it will be difficult to wear for a long time, and if it is too thick, the fit of the absorbent body to the body (body compatibility) will be reduced. Therefore, the thickness of the absorber 10 was made into the said range.
  • the absorber 10 has a groove 20 on one side thereof.
  • the groove 20 has, for example, a plurality of vertical grooves 20A in the longitudinal direction (Y direction) of the absorber 10, and a plurality of horizontal grooves 20B in the width direction (X direction) orthogonal to the longitudinal direction.
  • the lateral grooves 20B are arranged by shifting the arrangement position in the longitudinal direction for each row in the longitudinal direction.
  • These vertical groove 20A and horizontal groove 20B are connected to form a continuous groove.
  • Various arrangements of the grooves 20 can be employed.
  • a part of the grooves 20 may be arranged in an oblique lattice shape or may be a curved shape.
  • the depth D of the groove 20 is 20% or more and less than 100% of the thickness T of the absorber 10, preferably 25% or more and 95% or less, more preferably 30% or more and 90% or less, and still more preferably 30. % To 85%.
  • a plurality of absorber blocks 44 are separated on the side of the groove 20, and a part of the absorber 10 is left at the bottom of the groove 20.
  • the plurality of absorber blocks 44 are connected by the absorber 10 ⁇ / b> B existing at the bottom of the groove 20.
  • the depth of the groove 20 is set to the above range.
  • the total area of the openings of the groove 20 as viewed in plan with respect to the surface area of the absorber 10 as viewed in plan is 10% or more and 40% or less, preferably 15% or more and 35% or less, and more preferably 20 % To 30%. If the total area of the groove 20 is less than 10%, the amount of liquid that can be passed through the groove 20 is reduced, so that the diffusibility of the liquid is lowered and it is difficult to spread the liquid over a wide area of the absorber 10. On the other hand, if the total area of the groove 20 becomes too large, the diffusibility of the liquid increases, but the volume of the absorbent body 10 that stores the liquid becomes too small, and it becomes difficult to sufficiently absorb the liquid. In addition, the function as a liquid flow path is also reduced.
  • the width of the groove 20 is not less than 1 mm and not more than 10 mm, preferably not less than 2 mm and not more than 8.5 mm, more preferably not less than 3 mm and not more than 7 mm. If the width of the groove 20 is too wide, it will not have the function as a groove, and if it is too narrow, the liquid permeability will be reduced and the range in which the liquid will be diffused through the groove 20 will be narrowed. The liquid will be returned to the surface.
  • the density of the absorber 10 at the bottom of the groove 20 is preferably lower than the density of the absorber 10 other than the bottom of the groove 20. Since the density of the absorber 10 at the bottom of the groove 20 is made lower than the density of the other absorbers 10 in this way, the liquid supplied into the groove 20 tends to spread in the groove 20 and the absorption at the bottom of the groove 20 is also achieved. It is easily absorbed by the body 10. When the density of the absorber 10 at the bottom of the groove 20 and the density of the absorber 10 at the side wall of the groove 20 are equal, the liquid supplied into the groove 20 flows into the absorber 10 from the bottom and side walls of the groove 20. To be absorbed.
  • the density range is set as described above.
  • the absorbent body 10 of the present invention has both the high absorption amount and the high absorption speed of the liquid by arranging a plurality of grooves 20 and using the water-absorbing polymer 42 having excellent absorbency even under load. Even in the absorption of the excretion liquid by repeated excretion, the absorption rate is unlikely to decrease, and an excellent effect of exhibiting high absorption performance from the start of use to the end of use is achieved.
  • an example of an absorption process when the drainage liquid is supplied to the absorber 10 described above will be described with reference to FIG.
  • an excretory liquid (for example, urine) 60 is supplied to the absorber 10.
  • the drainage liquid 60 quickly flows into the groove 20 of the absorbent body 10, and since the flow path of the groove 20 is secured, it quickly travels along the groove 20 and spreads in all directions. Go. At this time, it also diffuses into the absorber 10 at the bottom of the groove 20 and the side wall.
  • the absorber block 44 has a higher density than the absorber 10 portion at the bottom of the groove 20, it is diffused into the absorber 10 portion at the bottom of the groove 20. Then, as shown in FIG.
  • the drained liquid 60 spreads using the groove 20 as a flow path and is diffused into the absorber 10 portion at the bottom of the groove 20, and is eventually absorbed by the absorber block 44 by capillary force.
  • the drained liquid is stored in the absorber block 44 and fixed. In this way, the absorbent body 10 achieves high absorption performance and high absorption speed.
  • the liquid absorption amount of the absorber 10 improves by using the water absorbing polymer 42 mentioned above, when it is set as the same absorption amount as a conventional product, the usage-amount of the water absorbing polymer 42 is reduced, Thinning is possible. Therefore, there are also advantages such as thinning and downsizing of an absorbent article using the absorbent body 10 of the present invention. Furthermore, since the groove 20 is provided on one surface side of the absorbent body 10 obliquely in the vertical and horizontal directions, the degree of freedom for deformation of the absorbent body 10 is increased. For this reason, the body suitability of the absorbent body 10 is enhanced, and the liquid can be passed to the end of the absorbent body 10. Therefore, the liquid absorption amount of the absorbent body 10 can be improved.
  • the water-absorbing polymer 42 is polymer particles having water absorption, and the production method is not limited.
  • the shape is not particularly limited, and may be spherical, lump, grape-like, indefinite shape, porous, powdery or fibrous.
  • the average particle diameter of the water-absorbing polymer 42 is 100 ⁇ m or more and 1000 ⁇ m or less, preferably 150 ⁇ m or more and 650 ⁇ m or less, in order to suppress dropping from the product, suppression of movement, and suppression of deterioration in use feeling (roughness). Preferably they are 200 micrometers or more and 500 micrometers or less.
  • the water absorption amount of the water-absorbing polymer 42 and the absorption amount under pressure are as described above.
  • the water-absorbing polymer 42 polymerizes one or more selected from the following monomers. Moreover, it bridge
  • the polymerization method is not particularly limited, and various generally known water-absorbing polymer methods such as a reverse phase suspension polymerization method and an aqueous solution polymerization method can be employed. Thereafter, the polymer is obtained by subjecting the polymer to operations such as pulverization and classification as necessary to adjust the polymer to a desired average particle size and, if necessary, treating with inorganic fine particles.
  • the monomer used in producing the water-absorbing polymer 42 is a water-soluble monomer having a polymerizable unsaturated group. Specifically, olefinic unsaturated carboxylic acid or salt thereof, olefinic unsaturated carboxylic acid ester, olefinic unsaturated sulfonic acid or salt thereof, olefinic unsaturated phosphoric acid or salt thereof, olefinic unsaturated phosphate ester And vinyl monomers having polymerizable unsaturated groups such as olefinic unsaturated amines, olefinic unsaturated ammonium salts, and olefinic unsaturated amides.
  • Examples of the olefinic unsaturated carboxylic acid or salt thereof include unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid and fumaric acid, alkali metal salts and ammonium salts thereof.
  • olefinic unsaturated carboxylic acid esters examples include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, methoxypolyethylene glycol (meth) acrylate, polyethylene glycol mono (meth) acrylate, and phenoxypolyethylene glycol (meth). An acrylate etc. are mentioned.
  • olefinic unsaturated sulfonic acids or salts thereof examples include vinyl sulfonic acid, allyl sulfonic acid, styrene sulfonic acid, 2- (meth) acrylamide-2-methylpropane sulfonic acid, 2- (meth) acryloylethane sulfonic acid, 2- (Meth) acryloylpropane sulfonic acid or a salt thereof may be mentioned.
  • Examples of the olefinic unsaturated phosphoric acid or a salt thereof include (meth) acryloyl (poly) oxyethylene phosphoric acid ester or a salt thereof.
  • Examples of the olefinic unsaturated amine include N, N-dimethylaminoethyl (meth) acrylate, N, N-diethylaminoethyl (meth) acrylate, N, N-dimethylaminopropyl (meth) acrylate, and N, N-dimethylaminopropyl. (Meth) acrylamide etc. are mentioned.
  • olefinic unsaturated ammonium salt examples include quaternary ammonium salts of the above olefinically unsaturated amines.
  • Examples of the olefinic unsaturated amide include (meth) acrylamide, methyl (meth) acrylamide, N-ethyl (meth) acrylamide, N-propyl (meth) acrylamide, N-isopropyl (meth) acrylamide, N, N-dimethyl (meth) ) (Meth) acrylamide derivatives such as acrylamide, vinylmethylacetamide and the like.
  • nonionic hydrophilic group-containing unsaturated monomers such as vinylpyridine, N-vinylpyrrolidone, N-acryloylpiperidine, N-acryloylpyrrolidine, and N-vinylacetamide.
  • (meth) acrylate means acrylate or methacrylate
  • (meth) acrylamide means acrylamide or methacrylamide
  • (meth) acryloyl means acryloyl or methacryloyl.
  • olefinic unsaturated carboxylic acids or salts thereof are preferred, acrylic acid, methacrylic acid, alkali metal salts, alkaline earth metal salts or ammonium salts thereof are more preferred, and acrylic acid, alkali metal acrylate salts. (Lithium salt, sodium salt, potassium salt, etc.) and ammonium acrylate are further preferred.
  • the absorber manufacturing apparatus 100 has a rotatable fiber pile 101.
  • a suction part 102 is arranged in the fiber stacking drum 101.
  • a supply unit 103 is provided on the outer peripheral surface of the stacking drum 101 to supply pulp and superabsorbent polymer (SAP), which are constituent materials of the absorbent body 10, on the air.
  • SAP superabsorbent polymer
  • the supply unit 103 includes a pulp supply unit 104 that supplies pulp by crushing pulp and a polymer supply pipe 105 that supplies superabsorbent polymer, and the outer peripheral surface of the stacking drum 101 that supplies the supplied pulp and superabsorbent polymer. It has a duct 106 for carrying air.
  • the fiber stacking drum 101 is partitioned on the drum surface in the shape of an absorbent body, and a fiber stacking cavity 107 is disposed in which the absorbent body is stacked.
  • the bottom surface of the stacking cavity 107 has a large number of ventilation holes (not shown), and the air supplied into the stacking cavity 107 is sucked by the suction part 102 through the ventilation holes.
  • a non-suction protrusion 108 is provided on the bottom surface of the fiber stacking cavity 107 to provide a recess in the absorber.
  • the protrusion 108 has a shape obtained by transferring the shape of the recess disposed in the absorber.
  • an unloading means (not shown) for unloading the stacked absorbent body is arranged at the lower part of the stacking drum 101.
  • the pulverized pulp and the highly water-absorbing polymer supplied together with the carrier gas (for example, air) by the supply unit 103 are supplied into the fiber stacking cavity 107 and predetermined by the suction force of the suction unit 102.
  • the absorber is manufactured by depositing in shape.
  • the density of the absorber can be adjusted to a desired density by adjusting the supply amount of pulverized pulp and superabsorbent polymer per hour, the wind speed (wind pressure) at the time of supply, and the like.
  • pulverized pulp 111 and superabsorbent polymer 112 are deposited in the stacking cavity 107 disposed on the outer periphery of the stacking drum 101.
  • the stacking cavity 107 is arranged on the outer periphery of the stacking drum 101, the bottom surface may be curved along the outer peripheral surface thereof.
  • the pulverized pulp 111 and the superabsorbent polymer 112 are further deposited in the stacking cavity 107 to form the protruding liquid absorption storage portion 32.
  • the liquid receiving layer portion 31 is formed. Since the protruding liquid absorption storage part 32 and the liquid receiving layer part 31 are continuously deposited in this way, the deposition is completed without generating an interface between the protruding liquid absorption storage part 32 and the liquid receiving layer part 31.
  • the absorber 10 can be manufactured.
  • the absorber 10 deposited from inside the fiber stack cavity 107 is peeled off, and a pressing process is performed in which only the protruding liquid absorption storage section 32 having a large thickness is pressurized and compressed so that the protruding liquid absorption storage section 32 is A density difference is generated between the liquid receiving layer portion 31 at the bottom of the recess 20 so as to have a high density. Furthermore, the absorber 10 is completed by inverting it up and down, as shown in FIG. Therefore, in the absorber manufacturing apparatus 100, the protruding liquid absorption storage unit 32 is configured first, and then the liquid receiving layer unit 31 is configured continuously.
  • the absorbent body 10 manufactured by stacked fiber (deposition) is not particularly limited as a constituent material, but a fiber material, a porous body, a combination thereof, or the like can be used.
  • fiber materials include natural fibers such as wood pulp, cotton and hemp, polyolefin resins such as polyethylene and polypropylene, polyester resins such as polyethylene terephthalate, single fibers made of synthetic resins such as polyvinyl alcohol resin, and these resins.
  • a composite fiber containing two or more kinds, or a semi-synthetic fiber such as acetate or rayon can be used.
  • the fiber may be a heat-shrinkable fiber that changes its shape by heat.
  • heat increases the fineness but shortens the fiber length, or heat hardly changes the fineness, but the shape is deformed into a coil shape and the apparent fiber occupies a shorter length. May be.
  • a porous body a sponge, a nonwoven fabric, an aggregate of a superabsorbent polymer, or the like can be used.
  • the superabsorbent polymer contained in the absorbent body 10 is preferably one that can absorb and hold a liquid that is five times or more of its own weight and can gel.
  • the shape is not particularly limited and may be spherical, massive, grape-like, powdery or fibrous.
  • the particle size is preferably 1 ⁇ m to 1000 ⁇ m, more preferably 10 ⁇ m to 500 ⁇ m.
  • examples of such superabsorbent polymers include polyacrylic acid and its salts and polyacrylate graft weights such as starch, cross-linked carboxymethylated cellulose, polymers or copolymers of acrylic acid or alkali metal acrylates. Coalescence can be mentioned.
  • the polyacrylic acid salt a sodium salt can be preferably used as the polyacrylic acid salt.
  • acrylic acid may contain a comonomer such as maleic acid, itaconic acid, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, 2- (meth) acryloylethanesulfonic acid, 2-hydroxyethyl (meth) acrylate or styrenesulfonic acid.
  • Copolymers copolymerized within a range that does not deteriorate the performance of the superabsorbent polymer can also be preferably used.
  • the absorbent body 10 contains the superabsorbent polymer
  • the superabsorbent polymer occupies the mass of the absorbent body 10.
  • the proportion is preferably 5% by mass to 95% by mass.
  • 10% by mass to 30% by mass is preferable, and in the case of an article that absorbs a high excretion amount of liquid such as a diaper, 50% by mass. It is preferably ⁇ 80% by mass.
  • the absorbent body 10 Regardless of whether the absorbent body 10 contains or does not contain a superabsorbent polymer, the absorbent body 10 has a holding amount of 0.9 mass% sodium chloride aqueous solution of 0.1 g or more, particularly 1 g or more, per 1 g of the absorbent body. Is preferable from the viewpoint of expressing stable absorption performance.
  • a holding amount As a constituent material of the absorbent body 10, fibers having high hydrophilicity and high capillary force (for example, pulp, rayon, etc.) and not dull even when wet (not plasticized or wet) It is advantageous to use a combination of synthetic fibers (which do not decrease strength) and superabsorbent polymers.
  • the protruding liquid absorption storage unit 32 is piled in a state where the density becomes high.
  • the protrusion 108 having a height smaller than the depth of the stacking cavity 107 is installed so as to obtain a shape shown in FIG. 26 to be described later, and fluff pulp and superabsorbent polymer are added.
  • the protruding liquid absorption storage part 32 is deposited first, and then the liquid receiving layer part 31 is deposited.
  • the suction force at the time of deposition of the liquid receiving layer portion 31 is reduced by the influence of the deposit accumulated in the protruding liquid absorption storage portion 32, and the density is lower than that of the protruding liquid absorption storage portion 32.
  • the density difference occurs from the top of the protruding liquid absorption storage part 32 to the liquid receiving layer part 31. Further, after the pulp and the superabsorbent polymer are deposited, the deposited absorbent body 10 is peeled from the stacking cavity 107 and pressed.
  • the protruding liquid absorption storage section 32 having a large basis weight and thickness, thereby causing a density difference between the protruding liquid absorption storage section 32 and the liquid receiving layer section 31 at the bottom of the recess 20.
  • the liquid absorption storage part 32 has a higher density than the liquid receiving layer part 31 at the bottom of the recess 20.
  • the absorber 10 (10C) of the said 3rd Embodiment makes the cross-sectional shape of the protrusion part 108 the trapezoid shape in which the fiber drum 101 side becomes a long side, and is the same method as said absorber 10A and 10B. Perform piles. Since the cross-sectional shape of the protruding portion 108 is a trapezoidal shape, the cross-section of the accumulated protruding liquid absorption storage portion 32 becomes a trapezoidal shape having the liquid receiving layer portion 31 side as a long side. Thereby, the top part of the protrusion liquid absorption storage part 32 becomes a trapezoid-shaped upper surface, and the difference in basic weight and thickness arises from a top part to a bottom part.
  • the trapezoidal upper surface which is the top of the protruding liquid absorption storage section 32, is actively subjected to pressure, and the central portion of the protruding liquid absorption storage section 32 And a side difference of the protruding liquid absorption storage part 32 cause a density difference.
  • the absorbent body 10 having the liquid receiving layer portion 31 on the non-skin contact surface side is produced by inverting the absorbent body 10.
  • the height of the protrusion 108 arranged in the fiber stacking cavity 107 shown in FIG. 25 (1) will be described below.
  • the center part and outer side part of the absorber 10 demonstrated below are as having demonstrated with the said FIG.
  • the fiber stacking cavity 107 corresponding to the portion where the recess 20 is disposed in order to reduce the basis weight of the liquid receiving layer 31 at the bottom of the recess 20 at the center of the absorbent body 10, the fiber stacking cavity 107 corresponding to the portion where the recess 20 is disposed.
  • the height of the inner protrusion 108 is set higher than that of the outer portion so that the liquid receiving layer portion 31 is deposited thinner than the outer portion.
  • the stacked fibers corresponding to the portion where the recess 20 is disposed in order to increase the basis weight of the liquid receiving layer portion 31 at the bottom of the recess 20 in the outer portion of the absorbent body 10, the stacked fibers corresponding to the portion where the recess 20 is disposed.
  • the height of the protruding portion 108 in the cavity 107 is set lower than that of the outer portion so that the liquid receiving layer portion 31 is deposited thickly. Further, as shown in FIG. 25 (4), in the vicinity of the boundary from the central portion to the outer portion of the absorber 10, the height of the protruding portion 108 may be gradually lowered from the central portion toward the outer portion. .
  • the pulverized pulp 111 and the superabsorbent polymer 112 are deposited in the stacking cavity 107 in which the protrusion 108 is formed with the thickness of the central portion in the longitudinal direction of the absorber 10 being 2 mm and the thickness of the outer periphery being 1 mm.
  • the basis weight of the liquid-receiving layer portion 31 at the bottom of the recess 20 at the center of the absorbent body 10 is 50 g / m 2.
  • the liquid receiving layer 31 at the bottom of the recess 20 on the outer side of the body 10 can be deposited thickly so that the basis weight of the liquid receiving layer 31 is 100 g / m 2 .
  • the thickness of the liquid receiving layer portion 31 at the bottom of the recess 20 is constant over the entire area of the absorber 10, The basis weight is also constant.
  • the diaper 50 has a constricted central portion in the longitudinal direction L corresponding to the crotch portion as a whole.
  • the top sheet 16 and the back sheet 17 respectively extend outward from the left and right side edges and both front and rear ends of the absorbent body 10.
  • the surface sheet 16 has a width direction d dimension smaller than the width direction dimension of the back sheet 17.
  • the diaper 50 is an unfolded diaper, and a pair of fastening tapes FT are attached to both side edges at one end in the longitudinal direction L. Further, a landing tape LT is attached on the back sheet 17 at the other end. It is preferable that the surface sheet 16 is not joined to the concave portion of the absorbent body 10 from the viewpoint that the water-absorbing polymer 42 is easily swelled.
  • the diaper 50 includes a three-dimensional gather that can rise above the edge in the width direction d side of the absorbent body 10. That is, a sheet material (side sheet) 18 for a three-dimensional gather having a gather elastic member 56 is arranged on each side of the diaper 50 in the longitudinal direction L to form a three-dimensional gather. Further, on one side of the diaper 50 in the longitudinal direction L, a pair of right and left leg elastic members 58 and 58 (two in this drawing) for leg gathers are arranged to form a leg gather. Yes.
  • the leg elastic members 58 for leg gathers are arranged substantially linearly in an extended state in the leg flaps extending outward from both side edges in the longitudinal direction of the absorbent body 10. In this case, the longitudinal direction L in the diaper 50 and the longitudinal direction L in the absorbent body 10 are the same direction.
  • the sheet material 18 for three-dimensional gathers has one or more gather elastic members 56 (three in the drawing) fixed to one side edge in an extended state.
  • the sheet material 18 is joined to the surface sheet 16 along the longitudinal direction L of the diaper 50 at positions outside the left and right side edges of the absorbent body 10 in the width direction d, and the joined portion is a three-dimensional gather. It is a rising base.
  • the sheet material 18 extends outward in the width direction d of the diaper 50 from the rising base end portion, and is joined to the back sheet 17 at the extended portion.
  • the sheet material 18 is bonded onto the top sheet 16 at the front and rear end portions in the longitudinal direction L of the diaper 50.
  • a liquid-impermeable or water-repellent and moisture-permeable material is preferably used.
  • the sheet material 18 include a liquid-impermeable or water-repellent porous resin film, a liquid-impermeable or water-repellent nonwoven fabric, or a laminate of the porous resin film and the nonwoven fabric.
  • the nonwoven fabric include thermal bond nonwoven fabric, spunbond nonwoven fabric, SMS nonwoven fabric, and SMMS nonwoven fabric.
  • the basis weight of the sheet material 18 is preferably 5 g / m 2 to 30 g / m 2 , more preferably 10 g / m 2 to 20 g / m 2 .
  • the surface sheet 16 various kinds of conventionally used diapers of this type can be used, and there is no limitation as long as it can transmit a liquid such as urine, and the liquid is permeable to the skin. It is preferably made of a soft material that hits the center. Examples thereof include woven fabrics and nonwoven fabrics made of synthetic fibers or natural fibers, and porous sheets. As an example, a non-woven fabric made of natural fibers such as cotton or a non-woven fabric made of various synthetic fibers subjected to a hydrophilic treatment can be used.
  • a core-sheath structure type including side-by-side type
  • composite fiber using polypropylene or polyester as a core component and polyethylene as a sheath component is formed into a web by carding, and then nonwoven fabric ( Thereafter, a predetermined portion may be subjected to a hole opening treatment).
  • an apertured sheet made of polyolefin such as low density polyethylene can also be preferably used.
  • the back sheet 17 various types conventionally used in this type of diaper can be used, and a liquid-impermeable or water-repellent and moisture-permeable sheet is preferably used.
  • a liquid-impermeable or water-repellent and moisture-permeable sheet is preferably used.
  • seat material 18 for solid gather formation mentioned above can be used.
  • a film made of a synthetic resin such as polyethylene in which fine powder made of a filler such as calcium carbonate is dispersed is stretched, and a porous film having fine holes is used. It is preferable.
  • the width of the back sheet 17 is set to be approximately the same as the width of the absorbent body 10 and is disposed on the non-skin contact surface side of the absorbent body 10.
  • the non-skin contact surface is a surface directed toward the clothing side (the side opposite to the wearer's skin side) when the diaper is worn.
  • the term skin contact surface may be used, and the skin contact surface is a surface directed toward the wearer's skin when the diaper is worn.
  • side sheets include non-woven fabrics, film sheets, and paper. From the viewpoint of leakage prevention, it is preferable that the side sheet is formed of a liquid non-permeable or hardly permeable hydrophobic nonwoven fabric, a leakage-proof film sheet, or the like. One sheet may be used, or two or more sheets may be combined with a functional sheet.
  • an intermediate sheet 19 (mounting paper) may be disposed between the top sheet 16 and the absorber 10.
  • the intermediate sheet 19 include those that have the function of drawing and diffusing excreted liquid, those that reduce the amount of liquid return, those that suppress leakage of the water-absorbing polymer, and those that suppress collapse of the absorbent body. Used.
  • seat which has such performance the nonwoven fabric and film which contain the fiber which has hydrophilic property, or was processed with the hydrophilic oil agent etc., or a porous body etc. are mentioned, for example.
  • the fibers for the intermediate sheet include (1) natural cellulose fibers such as wood pulp such as softwood kraft pulp and hardwood kraft pulp, and non-wood pulp such as cotton pulp and straw pulp, and (2) regenerated cellulose fibers such as rayon and cupra. (3) Hydrophilic synthetic fibers such as polyvinyl alcohol fibers and polyacrylonitrile fibers, (4) Synthetic fibers such as polyethylene terephthalate (PET) fibers, polyethylene (PE) fibers, polypropylene (PP) fibers, and polyester fibers. These can be used, and these can be used alone or in combination of two or more.
  • natural cellulose fibers such as wood pulp such as softwood kraft pulp and hardwood kraft pulp, and non-wood pulp such as cotton pulp and straw pulp
  • Hydrophilic synthetic fibers such as polyvinyl alcohol fibers and polyacrylonitrile fibers
  • Synthetic fibers such as polyethylene terephthalate (PET) fibers, polyethylene (PE) fibers, polypropylene (PP) fibers, and polyester fibers
  • the intermediate sheet 19 for example, paper such as tissue paper, woven fabric, non-woven fabric, knitted fabric, parchment, papyrus, pulp piled fiber, and the like can be used.
  • the nonwoven fabric include a chemical bond nonwoven fabric, a thermal bond nonwoven fabric, an airlaid nonwoven fabric, a spunlace nonwoven fabric, a spunbond nonwoven fabric, a melt blown nonwoven fabric, a needle punch nonwoven fabric, and a stitch bond nonwoven fabric.
  • These sheets may be in a single layer state or may have a multilayer structure in which a plurality of layers are laminated to form a single sheet.
  • a stretchable sheet for example, a non-woven fabric (elastic non-woven fabric) including a fiber containing an elastic resin as a constituent fiber, a film containing an elastic resin (elastic film), or a foaming means forms a three-dimensional network in the structure
  • an elastic porous body made of an elastic resin.
  • the basis weight of the intermediate sheet 19 is preferably 5 g / m 2 or more and 80 g / m 2 or less, particularly preferably 10 g / m 2 or more and 30 g / m 2 or less.
  • the thickness is preferably 0.05 mm or greater and 5.0 mm or less, and particularly preferably 0.1 mm or greater and 3.0 mm or less.
  • the intermediate sheet 19 may be disposed only between the top sheet 16 and the absorbent body 10, or may be disposed between the absorbent body 10 and the back sheet 17, and encloses the absorbent body 10. It may be arranged in such a way.
  • the material of the surface sheet 16, the absorber 10 and the back surface sheet 17 of the said embodiment, the conditions in a manufacturing method, and the dimensional specification of a product are not specifically limited, The various materials normally used can be used.
  • This diaper 50 can be used in the same manner as a normal unfolded diaper.
  • This diaper 50 is complicated by using a stretchable sheet for the liquid-receiving layer portion 31 serving as a base sheet of the absorbent body 10 by using the absorbent body 10 to achieve both a high absorption amount and a comfortable wearing feeling.
  • Human body compatibility that deforms according to the undulating skin surface and abuts on the surface without gaps, and motion tracking that deforms according to the movement of the wearer's body and maintains the state in contact with the skin surface and the surface Have.
  • a plurality of first recesses are formed from the viewpoint of diffusibility and fit.
  • the width of the recesses is larger than 2 mm to 5 mm, for example, 15 mm to 20 mm. The effect of can be produced.
  • the absorbent article is not limited to the above-described embodiment, and can be applied to this type of absorbent article, for example, disposable diapers, incontinence pads, incontinence liners, and the like. Moreover, even if the said absorbent article is for infants, it is applicable even if it is for adults. Furthermore, it is effective not only for urine but also for menstrual blood, orimono, loose stool and the like.
  • the top sheet 16, the absorbent body 10, the back sheet 17, and the side sheet members may be appropriately incorporated in accordance with the use and function.
  • the material of the surface sheet 16, the absorber 10 and the back surface sheet 17 of the said embodiment, the conditions in a manufacturing method, and the dimensional specification of a product are not specifically limited, The various materials normally used can be used.
  • Example 1 The absorber 10 of Example 1 was produced as follows. First, the protrusion part 108 having a height of 2 mm was arranged so as to obtain the shape shown in FIG. 26 with respect to the stacking cavity 107 having a depth of 6 mm. The cross-sectional shape of the protrusion 108 is a rectangle. Then, fluff pulp (made by Warehauser, trade name NB416) and superabsorbent polymer (made by Nippon Shokubai, trade name W101) were deposited in the stacking fiber cavity 107.
  • fluff pulp made by Warehauser, trade name NB416
  • superabsorbent polymer made by Nippon Shokubai, trade name W101
  • the basis weight of the protruding liquid absorption storage part 32 is 200 g / m 2 for the pulp and 320 g / m 2 for the superabsorbent polymer, and the basis weight of the liquid receiving layer part 31 at the bottom of the recess 20 is 50 g for the pulp. / M 2 , the superabsorbent polymer is 50 g / m 2 .
  • the deposited absorbent body 10 was peeled from the stacking cavity 107 and pressed at a pressure of 0.025 MPa.
  • the absorbent body 10 was inverted and arranged so as to have the liquid receiving layer portion 31 on the non-skin contact surface side, and the whole was covered with a tissue having a basis weight of 16 g / m 2 .
  • Example 2 The absorbent body 10 of Example 2 was manufactured in the same procedure as in Example 1 except that the height of the protrusion 108 was 2 mm at the center in the longitudinal direction of the absorber and 1 mm at the outer side.
  • the absorbent body of Comparative Example 1 performs fiber filling in the same manner as in Example 1 except that the height of the protrusion 108 is set to 6 mm for the fiber stacking cavity 107 having a depth of 6 mm, and does not have a liquid receiving layer portion.
  • Comparative Example 2 Similarly to Comparative Example 1, the absorbent body of Comparative Example 2 performs fiber filling in the same manner as in Example 1 except that the height of the protruding portion 108 is set to 6 mm for the fiber stacking cavity 107 having a depth of 6 mm.
  • An independent block was obtained without a layer. After the obtained block was arranged in the shape shown in FIG. 26 on a pulp sheet having a basis weight of 50 g / m 2 prepared in a separate process, the whole was covered with a tissue having a basis weight of 16 g / m 2. did.
  • the kink ratio of the absorber 10 was calculated
  • the walking test apparatus 200 is made by imitating a human body shape, for example, imitating from the upper abdomen to the thigh, and the thigh performs the same operation as human walking. It is. As for the walking conditions, first, walking was performed for 1 minute at a walking speed of 120 steps per minute.
  • physiological saline was supplied to the absorber at a supply rate of 8 g per second, and walking was further performed for 10 minutes at a walking speed of 120 steps per minute.
  • the physiological saline supply and 10-minute walking were taken as one set, and 5 sets were repeated continuously.
  • a total of 40 g of physiological saline is supplied to the absorber.
  • the floating state of the protrusion liquid absorption storage part of an absorber was confirmed by visual observation.
  • the liquid return amount of the absorber was determined as follows. Place a cylinder with an inner diameter of 35 mm at the center in the longitudinal direction and the width in the center of the absorbent body, and maintain the liquid so that the height from the position of the absorbent body into which the liquid is injected is 10 mm, while using physiological saline as the liquid 40 g was injected. At the bottom of the cylinder, an acrylic plate (thickness 5 mm, length 250 mm, width 100 mm) is provided with a size that can cover the entire product. Ten minutes after the start of absorption, 40 g is injected again by the same method. This operation was repeated four times, and a total of 160 g of physiological saline was absorbed by the absorber.
  • a filter paper Advanced Materials No.
  • Liquid return amount (g) mass of filter paper after pressurization (W2) ⁇ mass of first filter paper (W1) Table 1 shows the dripping rate, the floating state of the protruding liquid absorption storage unit, and the measured liquid return amount.
  • the kink rate is reduced and the protruding liquid absorption storage part is lifted more than the absorbent body in which the protruding liquid absorption storage part is arranged independently.
  • the liquid return amount was reduced to 33% to 77%, and the effect of maintaining a smooth feeling at the time of wearing was obtained even after the liquid was absorbed.
  • the amount of liquid return was further reduced by making the basis weight of the outer portion in the longitudinal direction higher than the basis weight of the central portion.
  • the average particle size is calculated by classifying 100 g of the water-absorbing polymer using a sieve according to JIS Z-8801-1982, and determining the average particle size from the mass fraction of each fraction.
  • the water absorption was measured at room temperature (20 ⁇ 5 ° C.) and 1.00 g of the water-absorbing polymer was swollen in 150 mL of physiological saline (0.9% NaCl aqueous solution, manufactured by Otsuka Pharmaceutical) at room temperature (20 ⁇ 5 ° C.) for 30 minutes. Then, it is put in a 250 mesh non-woven bag, dehydrated at 143 G for 10 minutes with a centrifuge, and the total mass (total mass) after dehydration is measured. And according to following Formula (1), the holding
  • the remaining amount of the nonwoven fabric bag liquid (the weight of the nonwoven fabric bag after centrifugal dehydration) ⁇ (the weight of the nonwoven fabric bag).
  • a measuring apparatus that performs a method for measuring the amount of absorption under pressure will be described.
  • a column 210 is prepared in which a mesh 213 (250 mesh) is attached to a lower end opening 212 of a vertically arranged cylinder 211 (inner diameter 30 mm).
  • 0.500 g of water-absorbing polymer 42 (particles) is put so as to have a uniform thickness.
  • a weight 221 (a weight to which a pressure of 2.0 kPa is applied) slightly smaller than the outer diameter of 30 mm is placed on the water-absorbing polymer 42.
  • the water-absorbing polymer I was synthesized as follows.
  • Synthesis Example 1 a SUS304 5 L reaction vessel (using anchor blades) equipped with a stirrer, a reflux condenser, a monomer dropping port, a nitrogen gas inlet tube, and a thermometer was used as a dispersant.
  • Sodium lauryl ether sodium sulfate (trade name EMAL 20C) 0.11% [to acrylic acid mass] was charged, and 1600 mL of cyclohexane was added. The mixture was stirred under a nitrogen atmosphere, and the temperature was raised to an internal temperature of 77 ° C.
  • a titanium citrate aqueous solution (50% citric acid and titanyl sulfate aqueous solution were mixed at a mass ratio of 20/27) was prepared.
  • Monomer A is prepared by adding 7.2 g of initiator (A) aqueous solution to monomer aqueous solution A
  • monomer B is prepared by adding 7.2 g of initiator (A) aqueous solution and 1.5 g of titanium citrate aqueous solution to monomer aqueous solution B.
  • 10.5 g of the initiator (B) aqueous solution and 3 g of the titanium citrate aqueous solution were added to the monomer aqueous solution C to prepare monomer C.
  • azeotropic dehydration is performed using a dehydrating tube, the water content of the water-absorbing polymer (hydrogel) is adjusted to 60%, and ethylene glycol diglycidyl ether manufactured by Nagase Kasei Kogyo Co., Ltd. (product) (Name Denacol EX-810) 0.33 g dissolved in 10 g of water was added.
  • the water-absorbing polymer II was synthesized as follows.
  • 0.33 g of ethylene glycol diglycidyl ether (trade name Denacol EX-810) manufactured by Nagase Kasei Kogyo Co., Ltd. was changed to 0.18 g as a crosslinking agent in Synthesis Example 1 described above, and a water-absorbing polymer was used. Obtained.
  • 1% of a quaternary ammonium salt (trade name Cotamine 86W) manufactured by Kao Corporation (based on the heavy mass of the water-absorbing polymer) was added with water dilution and dried. After removing coarse particles with a sieve having an opening of 850 microns, 100 parts of the polymer particles are dry blended with 0.5 part of the product name Aerosil 200 manufactured by Nippon Aerosil Co., Ltd. Obtained.
  • Synthesis Example 3 the water-absorbing polymer III was synthesized as follows.
  • Synthesis Example 3 is the same as Synthesis Example 2 except that 0.18 g of ethylene glycol diglycidyl ether (trade name Denacol EX-810) manufactured by Nagase Kasei Kogyo Co., Ltd. was changed to 0.25 g as a crosslinking agent. The water-absorbing polymer III was obtained.
  • the water-absorbing polymer IV was synthesized as follows.
  • a SUS304 5L reaction vessel (using anchor blades) equipped with a stirrer, reflux condenser, monomer dropping port, nitrogen gas inlet tube, thermometer, and sodium polyoxyethylene lauryl ether sulfate (manufactured by NOF Corporation) as a dispersant.
  • (Trade name Persoft EL) 0.06% [heavy weight of acrylic acid] and stearoyl methyl taurine sodium (trade name Nikkor SMT) manufactured by Nikko Chemicals Co., Ltd. 0.04% [weight of acrylic acid] were charged, and 1600 mL of heptane was added. added. The mixture was stirred under a nitrogen atmosphere and the temperature was raised to an internal temperature of 88 ° C.
  • monomer aqueous solution D was divided into three parts, 264 g (hereinafter referred to as monomer aqueous solution E) and 528 g (hereinafter referred to as monomer aqueous solution F).
  • a titanium citrate aqueous solution (50% citric acid and titanyl sulfate aqueous solution were mixed at a mass ratio of 20/54) was prepared.
  • Prepare monomer A by adding 2.3 g of initiator (C) aqueous solution to monomer aqueous solution D, and prepare monomer E by adding 6.9 g of initiator (C) aqueous solution and 1.5 g of titanium citrate aqueous solution to monomer aqueous solution E.
  • 10.5 g of the initiator (D) aqueous solution and 3 g of the titanium citrate aqueous solution were added to the monomer aqueous solution F to prepare monomer F.
  • azeotropic dehydration is performed using a dehydrating tube, the water content of the water-absorbing polymer (hydrogel) is adjusted to 60%, and ethylene glycol diglycidyl ether (trade name) manufactured by Nagase Chemical Industries, Ltd. is used as a crosslinking agent.
  • Table 1 shows the average particle diameter, water absorption, and absorption under 2 kPa pressure of each of the water-absorbing polymers I, II, III, and IV in Synthesis Examples 1 to 4 described above.
  • Example 3 In Example 3, the same operation as in Example 2 was performed, except that the superabsorbent polymer used in Example 2 was the water-absorbing polymer III of Synthesis Example 3.
  • the mass ratio represented by [mass of pulp] / [mass of water-absorbing polymer] was 1 / 1.6.
  • the thickness of the absorber was 3 mm and the depth of the groove was 2 mm.
  • the density of the block portion is 0.2 g / cm 3
  • the density of the liquid receiving layer portion of the concave bottom was 0.05 g / cm 3.
  • the absorbent body obtained by pressing was placed between the top sheet and the back sheet to obtain an absorbent article.
  • the surface sheet which is the skin contact surface, uses the surface material and intermediate sheet of the product name Marys manufactured by Kao Corporation, and the back sheet of the product name Marys manufactured by Kao Corporation is used for the liquid-impermeable back sheet. A sheet was used.
  • Example 4-1 was the same as Example 3 except that the superabsorbent polymer used in Example 3 was the water-absorbing polymer IV of Synthesis Example 4.
  • Example 4-2 was the same as Example 4-1, except that, in Example 4-1, the absorbent body was inverted and disposed so as to have a liquid-receiving layer portion on the skin contact surface side.
  • Example 1 In Reference Example 1, the same operation as in Example 3 was performed except that the superabsorbent polymer used in Example 3 was the water-absorbing polymer I of Synthesis Example 1.
  • Reference Example 2 In Reference Example 2, the same operation as in Example 3 was performed except that the water-absorbing polymer II of Synthesis Example 2 was used as the superabsorbent polymer in Example 3.
  • Comparative Example 3 Comparative Example 3 is the same as that of Example 4-1, except that the stacking fiber cavity 107 without the protrusions 108 is arranged with the contour shown in FIG. 26, and the spraying amount of the water-absorbing polymer IV is increased by 1.1 times. Then, the same operation as in Example 4-1 was performed to obtain an absorbent article having no recess. Moreover, the thickness of the absorber was 3 mm.
  • Example 5 an absorbent article including an absorbent body having the shape shown in FIG. 31 was produced as follows. As shown in FIG. 31 (1), the water-absorbing polymer III obtained in Synthesis Example 3 is used as the water-absorbing polymer 42, and a laminate 43 (with a basis weight of 50 g / m 2) of the pulp sheet 41S and the water-absorbing polymer 42 is used. A three-layer sprayed water-absorbing polymer 42 with a basis weight of 100 g / m 2 for each layer was produced between the four layers of the pulp sheet 41S. As shown in FIG. 31 (1), the water-absorbing polymer III obtained in Synthesis Example 3 is used as the water-absorbing polymer 42, and a laminate 43 (with a basis weight of 50 g / m 2) of the pulp sheet 41S and the water-absorbing polymer 42 is used. A three-layer sprayed water-absorbing polymer 42 with a basis weight of 100 g / m 2 for each layer was produced between the four layers of the pulp sheet 41S. As shown in FIG.
  • tissue paper (not shown) having a basis weight of 16 g / m 2 coated with a hot melt agent was placed on the upper side (skin contact surface side) of each absorber block 44 and pressed with a mangle.
  • the mass ratio represented by [mass of pulp] / [mass of water-absorbing polymer] was 1 / 1.4.
  • the thickness of the absorber was 3 mm and the depth of the groove was 1.5 mm.
  • an absorbent body obtained by pressing was placed between the top sheet and the back sheet to obtain an absorbent article.
  • For the top sheet that is the skin contact surface use the surface material of the brand name Marys manufactured by Kao Co., Ltd.
  • For the liquid-impermeable back sheet use the back sheet of the brand name of Kao Co., Ltd. It was.
  • Example 6 As Example 6, when placing the pressed absorbent body between the top sheet and the back sheet in Example 5 described above, the pulp continuous layer was disposed on the top sheet side by reversing the top and bottom.
  • Comparative Example 4 As Comparative Example 4, a laminate of the produced pulp and the water-absorbing polymer in Example 5 (water-absorbing polymer III between 4 layers of 50 g / m 2 basis weight pulp sheet at a basis weight of 80 g / m 2 for each layer) A three-layer spray) was cut to a width of 100 mm and a length of 375 mm to obtain an absorbent article. Note that the basis weight of the water-absorbing polymer was lowered by the amount that the area of the absorber was wider than that in Example 5, and the amount of water-absorbing polymer used was the same as that in Example 5.
  • the mass ratio represented by [mass of pulp] / [mass of water-absorbing polymer] in the absorber was 1 / 1.2, and the thickness of the absorber was 3 mm.
  • Comparative Example 5 Comparative Example 5, Reference Example 3, at a basis weight of each layer 90 g / m 2 water-absorbing polymer I between the laminate (basis weight 50 g / m 2 pulp sheets 4 layers of a pulp and water-absorbing polymer prepared A three-layer spray) was cut to a width of 100 mm and a length of 375 mm to obtain an absorbent article.
  • the area of the absorber is larger than that of Comparative Example 4, the basis weight of the water-absorbing polymer is lowered, and the amount of water-absorbing polymer used is about 1.13 times that of Example 5.
  • the mass ratio represented by [mass of pulp] / [mass of water-absorbing polymer] in the absorber was 1 / 1.4, and the thickness of the absorber was 3 mm.
  • an acrylic cylinder having an inner diameter of 35 mm is placed in the longitudinal direction of the absorbent article from the ventral side edge portion at 150 mm and in the width direction at the center, and 40 g of colored artificial urine is applied to the entire absorbent article while applying a load of 2.0 kPa.
  • the liquid was injected while maintaining the liquid so that the height was 10 mm.
  • an acrylic plate having a size covering the entire absorbent article is provided at the lowermost part of the cylinder. At this time, the time required for absorption was measured (absorption time 1). The shorter the absorption time, the better the performance.
  • Liquid return amount (g) Mass of filter paper after pressurization (W2)-Mass of first filter paper (W1)
  • the measured absorption rate and liquid return amount were evaluated in three stages according to the following evaluation criteria.
  • the case where the absorption time was less than 30 seconds was evaluated as ⁇
  • the case where the absorption time was 30 seconds or more and less than 60 seconds was evaluated as ⁇
  • the case where the absorption time was 60 seconds or more was evaluated as ⁇ .
  • the liquid return amount was less than 1.0 g, “ ⁇ ”, when 1.0 g or more and less than 1.5 g, ⁇ , and when 1.5 g or more, ⁇ .
  • Example 3 the first to fourth liquid absorption time was less than 30 seconds.
  • Reference Examples 1 and 2 the first to third absorption times were almost the same as those of Examples 3, 4-1, and 4-2, but the fourth absorption time was less than 60 seconds. Met.
  • Comparative Example C using an absorber having no groove (concave portion) the test liquid leaked from the portion corresponding to the crotch of the diaper during the third measurement, and the measurement could not be continued. As a result, it was found that the liquid absorption performance of the examples was maintained high from the start of use until the end of repeated absorption.
  • the water-absorbing polymer 42 used in the absorbent body 10 of the present invention is, for example, the first urination (urination), the second, the third, the fourth, Even if it is excreted, it does not swell even if the water-absorbing polymer 42 absorbs the excreted liquid (urine), and is not easily crushed by a load. Therefore, the state of the groove 20 at the first excretion is maintained. For this reason, the groove
  • the liquid return amount was less than 1.0 g, and Reference Example 1 using a water-absorbing polymer with a small amount of water absorption, a water-absorbing polymer with a low amount of absorption under pressure was used.
  • the liquid return amount was 1.0 g or more, and in Comparative Example 3 using an absorber having no groove (concave portion), measurement was impossible as described above.
  • the liquid can be passed through the groove 20 in the first to third urination.
  • the load of the wearer is applied to the water-absorbing polymer swollen by the third urination, so that the water-absorbing polymer is crushed and protrudes into the groove 20, and in the worst case, the groove 20 Since it is blocked, it becomes difficult to pass through the groove 20. For this reason, in the fourth drainage, it becomes difficult for the drained liquid to flow through the groove 20, so that the liquid cannot be sufficiently diffused and the liquid return amount increases.
  • the absorbent polymer used in Examples 3, 4-1, and 4-2 even if the water-absorbing polymer repeatedly absorbs the excretory liquid (urine), it does not swell and is not easily crushed by the load, so that the groove 20 is blocked.
  • the drained liquid can be diffused and absorbed throughout the absorber, so that the liquid return amount can be less than 1.0 g.
  • the absorption capacities of Examples 3, 4-1, and 4-2 were both 1.0 compared to Comparative Example 3 in which the amount of water-absorbing polymer used was 1.1 times greater than that of Example 4-1. It was found that the absorption capacity was equivalent to that of Comparative Example 3. That is, Examples 3, 4-1, and 4-2 were found to have a sufficient absorption capacity.
  • both the high absorption amount and the high absorption speed can be achieved in the repeated absorption of the drainage liquid after long-term use.
  • the liquid return amount is small and high absorption performance can be exhibited.
  • Example 5 the liquid absorption time was less than 30 seconds at the first time, and the absorption time was less than 60 seconds at the second to fourth absorption.
  • Comparative Example 3 obtained an evaluation result almost the same as that of the Example with respect to the absorption time, but Reference Example 4 using a water-absorbing polymer having a low absorption amount under pressure and a groove.
  • Comparative Examples 4 and 5 using an absorber that was not used the absorption time after the second time took 60 seconds or more, and the absorption time became longer. As a result, it was found that the liquid absorption performance of the examples was maintained high from the start of use until the end of repeated absorption.
  • the water-absorbing polymer 42 used in the absorbent body 10 of the present invention is, for example, the first urination (urination), the second, the third, the fourth, Even if it is excreted, it does not swell even if the water-absorbing polymer 42 absorbs the excreted liquid (urine), so the state of the groove 20 at the first excretion is maintained. For this reason, the groove
  • the liquid return amount was less than 1.5 g
  • Reference Example 3 using a water-absorbing polymer having a low water absorption amount Reference Example 4 using a water-absorbing polymer having a low absorption amount under pressure
  • Comparative Example 4 where the absorbent body did not have a groove the liquid return amount was 1.5 g or more. As a result, it was found that the liquid return amount of each example was small.
  • the groove 20 can be passed through the first urination.
  • the load of the wearer is applied to the water-absorbing polymer swollen in the first urination, so that the water-absorbing polymer is crushed and protrudes into the groove 20, and in the worst case, the groove 20 Since it is blocked, it becomes difficult to pass through the groove 20.
  • the drained liquid becomes difficult or no longer flows in the groove 20, so that the liquid cannot be sufficiently diffused and the liquid return amount increases.
  • the liquid return amount can be made less than 1.5 g.
  • the absorption capacities of Examples 5 to 6 are all 1.0 compared to Comparative Example 5 in which the amount of the water-absorbing polymer used is 1.13 times higher than that of Example 5, and is equivalent to Comparative Example 5. It was found to be absorption capacity. That is, it was found that each example has a sufficient absorption capacity. Thus, since each Example has sufficient absorption capacity, in each Example, the liquid return amount is less than 1.0 g, whereas in Reference Example 3, the absorption capacity is 0.8. The amount of liquid return increases. Further, in Comparative Example 4, the same amount of the same water-absorbing polymer III as in Example 5 was used, but because it did not have grooves, the absorption capacity as an absorber was lowered to 0.8, and the liquid return amount was become more.
  • both the high absorption amount and the high absorption speed can be achieved in the repeated absorption of the drainage liquid after long-term use.
  • the liquid return amount is small and high absorption performance can be exhibited.
  • the absorbent body 10 of the present invention is not limited to the above-described embodiment, but in addition to the unfolded diapers as described above, pants-type diapers, sanitary shorts, shorts-type napkins, sanitary napkins, incontinence pads, incontinence It can be used for an absorber contained in an absorbent article such as a liner. Moreover, even if the said absorbent article is for infants, it is applicable even if it is for adults. Furthermore, it is effective not only for urine but also for menstrual blood, orimono, loose stool and the like.

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  • Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Absorbent Articles And Supports Therefor (AREA)

Abstract

La présente invention concerne un produit absorbant qui, lorsqu'il est segmenté longitudinalement en trois parties, possède une première région d'absorption centrale, une deuxième région d'absorption qui est le segment sur un côté de la première région absorbante, et une troisième région d'absorption qui est le segment sur l'autre côté de la première région absorbante. Chacune desdites régions d'absorption possède les éléments suivants : une couche de réception de liquide, qui absorbe et diffuse du liquide dans la direction planaire ; et plusieurs régions de stockage et d'absorption de liquide en saillie ‑ situées sur une surface de la couche de réception de liquide ‑, qui forment une continuité avec la couche de réception de liquide et absorbent et stockent le liquide, et qui présentent des crevasses en forme de rainures encastrées sur une surface ou à des positions en regard sur les deux surfaces. Lesdites crevasses sont disposées entre les régions d'absorption et de stockage de liquide en saillie. Les premières crevasses situées dans la première région d'absorption sont à l'intérieur des rebords externes de la première région d'absorption, selon une vue en plan, et sont situées dans la direction longitudinale. Les deuxièmes et troisièmes crevasses situées respectivement dans les deuxième et troisième régions d'absorption se trouvent chacune dans une direction diagonale par rapport à la direction longitudinale. Les premières et deuxièmes crevasses, et les premières et troisièmes crevasses, sont conçues comme des crevasses formant une continuité les unes avec les autres, ou les premières crevasses sont séparées des deuxièmes crevasses et des troisièmes crevasses. Le rapport de section des régions d'absorption et de stockage de liquide en saillie est supérieur à celui des crevasses. La couche de réception de liquide des fonds des crevasses est un produit absorbant de masse surfacique et de densité inférieures à celles des régions d'absorption et de stockage de liquide en saillie.
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CN105455969A (zh) * 2014-09-30 2016-04-06 强生消费者公司 显示出受控变形和纵向流体分布的吸收制品
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JP2013085561A (ja) * 2011-10-13 2013-05-13 Kao Corp 吸収体
JP2014104036A (ja) * 2012-11-26 2014-06-09 Kao Corp 吸収性物品
CN105338937A (zh) * 2013-06-28 2016-02-17 大王制纸株式会社 吸收性物品
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CN105455971A (zh) * 2014-09-30 2016-04-06 强生消费者公司 显示出受控变形和纵向流体分布的吸收制品
EP3001993A1 (fr) * 2014-09-30 2016-04-06 Johnson & Johnson Consumer Inc. Article absorbant présentant une déformation contrôlée et une distribution de fluide longitudinale
CN105455969A (zh) * 2014-09-30 2016-04-06 强生消费者公司 显示出受控变形和纵向流体分布的吸收制品
EP3001995A1 (fr) * 2014-09-30 2016-04-06 Johnson & Johnson Consumer Inc. Article absorbant présentant une déformation contrôlée et une distribution de fluide longitudinale
EP3001997A1 (fr) * 2014-09-30 2016-04-06 Johnson & Johnson Consumer Inc. Article absorbant présentant une déformation contrôlée et une distribution de fluide longitudinale
CN105455970A (zh) * 2014-09-30 2016-04-06 强生消费者公司 显示出受控变形和纵向流体分布的吸收制品
EP3001996A1 (fr) * 2014-09-30 2016-04-06 Johnson & Johnson Consumer Inc. Article absorbant présentant une déformation contrôlée et une distribution de fluide longitudinale
EP3001994A1 (fr) * 2014-09-30 2016-04-06 Johnson & Johnson Consumer Inc. Article absorbant présentant une déformation contrôlée et une distribution de fluide longitudinale
EP3711728A1 (fr) * 2014-09-30 2020-09-23 Johnson & Johnson Consumer Inc. Article absorbant présentant une déformation contrôlée et une distribution de fluide longitudinale
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EP3494941A1 (fr) * 2014-09-30 2019-06-12 Johnson & Johnson Consumer Inc. Article absorbant présentant une déformation contrôlée et une distribution de fluide longitudinale
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