JP7195096B2 - sanitary napkin - Google Patents

Description

The present invention relates to sanitary napkins .

Absorbent articles such as sanitary napkins, panty liners, and incontinence pads generally have a liquid-permeable topsheet, a liquid-impermeable backsheet, and an absorbent body provided between the two sheets. is. In such absorbent articles, various measures have been taken so that they can conform to the shape of the body when worn. For example, a configuration is known in which compression grooves recessed from the top sheet side are provided, or the configuration of the absorbent body is locally changed.

For example, in Patent Document 1, a pair of first compressed grooves 91, 91 extending along the longitudinal direction and second compressed grooves 92, 92 formed on the outer side in the width direction than the first compressed grooves 91, 91 are provided. The rear end portions 91Eb of the first compressed grooves 91 and 91 are arranged on the rear side in the longitudinal direction from the front end portions 92Ef and 92Ef of the second compressed grooves 92 and 92, and the absorbent body 30 has the second compressed It has a low-rigidity region 100 along the longitudinal direction on the inner side of the grooves 92, 92 in the width direction and on the rear side of the center in the longitudinal direction. An absorbent article is disclosed in which the ends 91Eb are located.

JP 2014-223215 A

Patent Literature 1 describes that the disclosed configuration makes it easy for the absorbent body to fit along the grooves of the body and eliminates the cavity between the buttocks, thereby suppressing the backward leakage of bodily fluids. . However, no consideration is given to the movement of body fluids in the absorbent body after absorption, and when a large amount of body fluids are discharged at once, the guidance of the body fluids to the rear is not sufficient, and the rear region side Leakage may occur from the Leakage can also occur from the sides of the forward region as well.

In view of the above points, it is an object of one aspect of the present invention to provide an absorbent article that can suppress lateral leakage in at least one of the rear and front regions while maintaining high fitting properties. .

A first aspect of the present invention is an absorbent body elongated in the front-rear direction, having a liquid-permeable topsheet, a liquid-impermeable backsheet, and an absorbent body provided between the topsheet and the backsheet. wherein at least one side region in the front-rear direction from the central region including the part corresponding to the body fluid discharge port corresponding to the body fluid discharge port of the wearer when worn, and on both sides of the center line extending in the front-rear direction A pair of compressed grooves are provided, and the pair of compressed grooves extend toward the one side and the width between the compressed grooves gradually increases toward the one side, or between the compressed grooves when viewed in the front-rear direction The absorbent body has a body fluid guide portion on the center line that overlaps the pair of compressed grooves on the one side when viewed in the front-rear direction, and the one side of the body fluid guide portion At least part of the side edge is disposed between the pair of compression grooves, and the other side edge of the bodily fluid guide portion in the front-rear direction is included in the central region.

According to the first aspect, a pair of compression grooves are provided on both sides of the center line in the front-rear direction in at least one side in the front-rear direction (at least one of the front and rear sides) of the portion corresponding to the bodily fluid outlet. The pair of compressed grooves extends toward one side and includes a portion where the width between the compressed grooves gradually increases toward the one side, or a portion where the width between the compressed grooves is constant when viewed in the front-rear direction. Since the main body can be bent along the pair of compressed grooves, at least one of the front and rear regions of the body fluid outlet corresponding portion can be well fitted to the shape of the body. For example, the rear region can be fitted to the gluteal groove. Also, the anterior region can be fitted along the curve of the pubic bone.

Further, the absorbent body has a body fluid guide portion overlapping the pair of compressed grooves on one side when viewed in the front-rear direction, on the center line in the front-rear direction, and at least a portion of the edge on one side of the body fluid guide portion and the other end edge of the bodily fluid guide portion in the front-rear direction is included in the central region. Since the bodily fluid guiding portion is an absorber portion that has a higher bodily fluid drawing function than the surrounding absorber, the bodily fluid that has migrated in the front-rear direction from the bodily fluid outlet corresponding portion can be guided between the pair of compression grooves, At least one of the front region and/or the rear region can prevent body fluid from leaking to the outside in the width direction. For example, the bodily fluid that has migrated rearward from the body fluid outlet corresponding portion can be guided between the pair of compression grooves to prevent the bodily fluid from leaking from the obliquely rearward direction. In addition, body fluid that has moved forward from the body fluid outlet corresponding portion can be guided between the pair of compression grooves to prevent body fluid from leaking obliquely forward.

In the second aspect of the present invention, the edge of the one side of the bodily fluid guide portion is arranged between the pair of compression grooves.

According to the second aspect, it is possible to further improve the effect of guiding the bodily fluid between the pair of compression grooves and preventing leakage of the bodily fluid from at least one of the front region and/or the rear region.

In a third aspect of the present invention, a pair of central compression grooves extending substantially in the front-rear direction so as to include the body fluid outlet corresponding parts when viewed in the front-rear direction are provided on both sides of the center line, When viewed in the front-rear direction, the body fluid guide portion overlaps the one-side portion of the pair of central compressed grooves on the other side in the front-rear direction.

According to the third aspect, the provision of the pair of central compressed grooves makes it possible to prevent leakage to the outside in the width direction from the portion corresponding to the body fluid discharge port and the vicinity thereof. Furthermore, since the bodily fluid guide portion overlaps the portion on one side of the pair of central compression grooves on the other side in the front-rear direction when viewed in the front-rear direction, the body fluid discharged between the pair of central compression grooves can be quickly discharged to one side. It can be guided to the side and further between the pair of squeeze grooves in the region of one side. For example, body fluid expelled between a pair of central compression grooves can be directed rearward between a pair of compression grooves provided further in the posterior region, and can be guided forward and further between a pair of compression grooves provided in the front region. It can be guided between the squeeze grooves.

In a fourth aspect of the present invention, the ends of the pair of compressed grooves on the other side are spaced apart in the front-rear direction from the ends on the one side of the pair of central compressed grooves, and the pair of compressed grooves The other end of the groove is arranged inside the one end of the pair of front-rear compressed grooves when viewed in the width direction.

According to the fourth aspect, the ends of the pair of compressed grooves on the other side are spaced apart from the ends on the one side of the pair of central compressed grooves in the front-rear direction. The part provided and the part provided with the pair of central compression grooves can be moved independently. Therefore, at least one of the area extending from the front part of the central area to the front area and the area extending from the rear part of the central area to the rear area can be fitted so as to follow the movement of the body. In addition, since the ends on the other side of the pair of compressed grooves are arranged inside the ends on the one side of the pair of central compressed grooves when viewed in the width direction, the gas is guided forward along the central compressed grooves. To prevent bodily fluids from spreading outward in the width direction in the front region, body fluids guided backward along a central compressed groove from spreading outward in the width direction in the rear region, and to prevent body fluids from leaking.

In a fifth aspect of the present invention, the bodily fluid guiding portion includes a portion whose width gradually or stepwise decreases toward the one side.

According to the fifth aspect, at least part of body fluid can be reliably guided forward and/or backward.

In a sixth aspect of the present invention, the maximum width of the bodily fluid guiding portion is 10-35% of the width of the absorbent body.

In the sixth aspect, since the maximum width of the body fluid guide portion is within a predetermined range, the effect of guiding the body fluid between the pair of compression grooves can be further enhanced. is held, and on the contrary, it is possible to prevent hindrance to the front-rear direction guidance of body fluids.

ADVANTAGE OF THE INVENTION According to one aspect of the present invention, it is possible to provide an absorbent article that can suppress lateral leakage in at least one of the rear region and the front region while having high fitting properties.

1 is a partially cutaway view of an absorbent article according to one aspect of the invention; FIG. FIG. 1B shows a cross-sectional view taken along line II of FIG. 1A. FIG. 5 is a diagram illustrating the configuration and function of the bodily fluid guide portion and the pair of compression grooves in the rear region; 1B shows a variation of the configuration of FIG. 1A. 1B shows another variation of the configuration of FIG. 1A. It is a figure explaining the example of formation of a bodily fluid guide|induction part. It is a figure explaining another example of formation of a bodily fluid guidance part.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, in each drawing, unless there is a particular description, the same reference numerals may be attached to the same or corresponding configurations, and the description thereof may be omitted. Also, the drawings are schematic to aid understanding of the invention, and some dimensions may be larger or smaller.

(Basic structure of absorbent article)
FIG. 1A shows a partially cutaway plan view of an absorbent article 1 according to one embodiment of the present invention. Also, FIG. 1B shows a cross-sectional view of the absorbent article 1 taken along line II. As shown in FIGS. 1A and 1B, an absorbent article 1 includes a liquid-impermeable backsheet 2, a liquid-permeable topsheet 3, and an absorbent body 4 provided between the two sheets 2 and 3. and a main body (absorbent article main body) 8 having When the absorbent article 1 is worn, the top sheet 3 side is the side that touches the skin (skin side or surface side), and the back sheet 2 side is the side that is fixed to the underwear (underwear side or back side).

As shown in FIG. 1A, the main body 8 as a whole has a predetermined length in a first direction D1, a predetermined width in a second direction D2 orthogonal to the first direction D1, and a width in the front-rear direction D1. It has an elongated shape. Although the width of the main body 8 is substantially constant in the illustrated example, it may vary over the first direction (longitudinal direction) D1. As shown in FIG. 1A, the absorbent article 1 can have a shape substantially symmetrical with respect to a centerline (front-rear centerline) CL extending in a first direction (longitudinal direction) D1. In addition, the configuration of the absorbent article 1 (including the thickness and density of the absorbent body 4, the size and position of the compressed grooves, etc.) may be substantially symmetrical about the center line as an axis of symmetry, or may be asymmetrical. good.

The length of the absorbent article 1 in the first direction D1 (total length of the main body 8) is not particularly limited, but can be 150 to 450 mm, more preferably 170 to 290 mm. In addition, the length of the absorbent article 1 in the second direction D2 perpendicular to the first direction D1 (the width of the main body 8) is also not particularly limited, but can be 50 to 200 mm, preferably 70 to 120 mm. can do.

The absorbent article 1 has a portion (portion corresponding to the bodily fluid outlet) A corresponding to a bodily fluid outlet such as the vaginal opening of the wearer when worn, and the portion A corresponding to the bodily fluid outlet has a center Ac. . The center Ac is on the longitudinal center line CL and is located at the center of the length of the body fluid outlet corresponding portion A in the longitudinal direction. The position of the center Ac can be, for example, 70 to 130 mm from the front end of the absorbent article 1 . Further, the body fluid outlet corresponding portion A has a length (length in the longitudinal direction D1) of 10 to 50 mm, preferably about 20 to 40 mm, and a width of the body fluid outlet corresponding portion A (length in the width direction D2). can range from 5 to 40 mm, preferably from 10 to 30 mm. It should be noted that the illustrated shape and size of the portion A corresponding to the bodily fluid discharge port are merely examples for facilitating the description.

The absorbent article 1 has a central region M including the bodily fluid outlet corresponding portion A, a front region F in front of the central region M, and a rear region R behind the central region M. The central region M is a region corresponding to the crotch area of the wearer when worn. The central area M may be an area from the front end to the rear end of a pair of central compressed grooves 11, 11, which will be described later.

The central region M may also have wings W, W extending from both sides thereof for securely fixing the absorbent article 1 to the undergarment when worn. The front region F is a region from the starting point in front of the wing W or in front of it to the front edge, and the rear region R is the starting point in the rear of the wing W or from the rear to the rear edge. can be the area of In addition, when a central compressed groove extending substantially in the front-rear direction is provided so as to include a later-described bodily fluid outlet corresponding area in the front-rear direction D1, the central area M may be a region that includes the entire central compressed groove. can. When wings W are provided, the position in the longitudinal direction D1 of the center Ac of the part A corresponding to the bodily fluid outlet is near the position of the midpoint of the longitudinal length of the side edges of the wings W. can also be

Although the absorbent article 1 has wings W, W, the absorbent article 1 can be configured without the wings W, W. In that case, assuming that the wings W are formed, the area in front of the starting point of the front of the wings W, W or the vicinity thereof is defined as the front area F, and the starting point of the rear of the wings W, W or A rear area R can be defined as a rear area from the vicinity thereof.

As the back sheet 2, a sheet material having at least water impermeability, such as an olefin resin sheet such as polyethylene or polypropylene, can be used. A laminated nonwoven fabric obtained by laminating a nonwoven fabric on a polyethylene sheet or the like, or a laminated sheet of a nonwoven fabric in which a waterproof film is interposed to substantially ensure liquid impermeability can be used. Moreover, from the viewpoint of preventing stuffiness, it is more desirable to use a material having moisture permeability. Such water-impermeable/moisture-permeable sheet materials are produced by melting and kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching the sheet in a uniaxial or biaxial direction. A porous sheet or the like can be used.

The surface sheet 3 is a liquid-permeable sheet that allows bodily fluids such as menstrual blood, vaginal discharge, and urine to quickly pass therethrough. As the surface sheet 3, a perforated or non-perforated nonwoven fabric, a porous plastic sheet, or the like is preferably used. The material fibers that make up the nonwoven fabric include, for example, olefins such as polyethylene and polypropylene, synthetic fibers such as polyester and polyamide, regenerated fibers such as rayon and cupra, blended fibers thereof, and natural fibers such as cotton. It can be used in combination of two or more. Examples of nonwoven fabric processing methods include spunlace, spunbond, thermal bond, meltblown, needle punch, and the like. Among these processing methods, the spunlace method is preferable because it can produce a soft nonwoven fabric, the spunbond method is preferable because it can produce a nonwoven fabric with excellent drapeability, and the thermal bonding method is preferable because it can produce a bulky and soft nonwoven fabric. In addition, composite fibers such as core-sheath type fibers, side-by-side type fibers, split type fibers, etc., in which a fiber having a high melting point is used as a core and a fiber having a low melting point is used as a sheath, can also be used.

Absorbent body 4 is not limited as long as it is a material that can absorb and retain bodily fluids, but preferably contains cotton-like pulp and a water-absorbing polymer. As the absorbent polymer, superabsorbent polymer (SAP), superabsorbent fiber (SAF), and combinations thereof can be used. The pulp includes chemical pulp obtained from wood, cellulose fibers such as dissolving pulp, and artificial cellulose fibers such as rayon and acetate. Broad-leaved trees, softwoods, and the like are used as raw materials for chemical pulp, and softwoods are preferably used because of their long fiber length.

Synthetic fibers may also be mixed in the absorber 4 . As synthetic fibers, polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon, and copolymers thereof can be used. can also be used. In addition, composite fibers such as core-sheath type fibers, side-by-side type fibers, and split type fibers having a high melting point fiber as a core and a low melting point fiber as a sheath can also be used. It is also possible to use hydrophobic fibers surface-treated with a hydrophilizing agent to impart affinity to body fluids. The absorber 4 is preferably manufactured by a piling or airlaid method.

The thickness of the absorbent body 4 can be in the range of 0.3 to 30 mm, preferably in the range of 1.0 to 15 mm. The absorber 4 as a whole does not have to have a uniform thickness over the entire surface, and may have a structure in which the body fluid discharge port corresponding portion 50 and the region in the vicinity thereof are swollen. Also, the thickness of the portion where the later-described bodily fluid guiding portion 45 is provided may be smaller than the thickness of the periphery thereof.

The absorbent body 4 may be wrapped with an enveloping sheet 9 made of crepe paper or non-woven fabric for the purpose of retaining its shape. By wrapping the absorber layer with the enveloping sheet 9, the absorber 4 can be prevented from being twisted or cracked. As the enveloping sheet 9, non-colored (that is, white) crepe paper or non-woven fabric can be used, and colored ones can also be used. When a colored enveloping sheet 9 is used, the color of the enveloping sheet 9 can also be reflected as a light color from the top sheet 3 side. Therefore, the color of the discharged bodily fluid can be blended with the reflected color of the wrapping sheet 9 to make it inconspicuous. The enveloping sheet can be colored, for example, in a complementary color to the color of the bodily fluid. For example, in an absorbent article (such as a sanitary napkin) designed to absorb menstrual blood, the enveloping sheet can be colored green, which is a complementary color of red.

At the front and rear edge portions of the absorbent body 4, the outer edges of the backsheet 2 and the topsheet 3 are joined by adhesive such as hot melt, heat sealing, ultrasonic sealing or other bonding means. On the sides of the absorbent body 4, the side nonwoven fabrics 7, 7 provided along the longitudinal direction D1 on both sides of the topsheet 3 side and the backsheet 2 are joined by the above-mentioned adhesive means. The above wings W, W are formed by.

The side non-woven fabric 7 is made of a non-woven fabric material that has undergone appropriate water-repellent treatment or hydrophilic treatment in order to prevent permeation of bodily fluids or to improve touch feeling. The side nonwoven fabric 7 can be made of natural fibers, synthetic fibers, regenerated fibers, or the like. For the water-repellent treatment of the side non-woven fabric 7, a silicon-based, paraffin-based, or other water-repellent agent can be used.

(squeeze groove)
As shown in FIG. 1A, in the absorbent article 1 according to this embodiment, the main body 8 may be provided with a plurality of compressed grooves. The pressed grooves are pressed grooves (also referred to as fit emboss) recessed from the side of the top sheet 3 to the side of the back sheet 2, obtained by laminating the top sheet 3 and the absorbent body 4 and then pressing them together. . The compressed grooves can be formed by passing a laminate obtained by laminating the surface sheet 3 on the absorbent body 4 between a pair of pressure rolls. For example, a convex roll is arranged on the surface sheet 3 side of the laminate, and a flat roll is arranged on the absorber 4 side, and pressure can be applied by both rolls.

As shown in FIG. 1A, the compressed grooves provided in the absorbent article 1 include a pair of central compressed grooves 11, 11, front compressed grooves 13, 13, front auxiliary compressed grooves 14, 14, and rear compressed grooves 12, 12. is included. In the form shown in FIG. 1A, each compressed groove is provided line-symmetrically with respect to the center line CL in the front-rear direction in plan view, but the arrangement and configuration of the compressed groove (groove width, depth, etc.) are not necessarily It may not be line-symmetrical, and may be line-asymmetrical.

The pair of central compressed grooves 11, 11 are grooves that extend substantially in the front-rear direction on both sides of the front-rear center line CL at intervals from the front-rear center line CL. The pair of central compressed grooves 11, 11 can be provided laterally from the part A corresponding to the body fluid outlet so as not to overlap the part A corresponding to the body fluid outlet. Also, the pair of central compressed grooves 11, 11 extend so as to include the body fluid outlet corresponding portion A when viewed in the front-rear direction D1. The pair of central squeeze grooves 11, 11 are preferably located within the central region M, although they may extend beyond the central region M either forwardly or rearwardly.

The pair of central compressed grooves 11, 11 may be linear as long as they extend substantially in the front-rear direction, or may be curved or bent such that the vicinity of the center in the front-rear direction D1 expands inwardly or outwardly in the width direction D2. good. When the pair of central compressed grooves 11, 11 are curved so that the vicinity of the center in the front-rear direction D1 swells outward in the width direction D2 (away from the center line CL in the front-rear direction), the portion A corresponding to the body fluid discharge port is compressed when worn. It is preferable because it can be raised to fit the shape of the outlet.

In the rear region R of the absorbent article 1, a pair of rear compression grooves 12, 12 are provided on both sides of the centerline CL in the front-rear direction and spaced from the centerline CL. The pair of rear compressed grooves 12, 12 extend rearward, more specifically obliquely rearward, and have inter-groove width enlarged portions 12c, 12c in which the width between the compressed grooves gradually increases toward the rear. ing. In the illustrated embodiment, the groove-to-groove widened portions 12c, 12c form front portions of the pair of rear compression grooves 12, 12 (that is, the side near the central region M).

With the pair of rear compression grooves 12, 12, the absorber 4 can be easily folded along the pair of rear compression grooves 12, 12, and the planar main body 8 can be fitted to the shape of the body. In addition, since the width-enlarging portions 12c, 12c between the grooves are provided, the rear region R can be well fitted in accordance with the shape of the groove of the buttocks, which gradually widens toward the rear. It should be noted that the pair of rear compressed grooves 12, 12 are not groove-width enlarged portions 12c, 12c in which the width between the compressed grooves gradually increases toward the rear, but portions where the width between the compressed grooves is constant when viewed in the front-rear direction. may contain

The pair of rear compression grooves 12, 12 further extends rearward of the inter-groove widened portions 12c, 12c. The extended portions are respectively directed toward the center line CL in the front-rear direction, folded back forward, and curved again toward the outside in the width direction D2. In this way, the shape of the pair of rear compression grooves 12, 12 can be improved as a whole by making them substantially heart-shaped (substantially inverted heart-shaped in the orientation of FIG. 1A).

In the configuration shown in FIG. 1A, the front ends 12a, 12a of the pair of rear squeeze grooves 12, 12 are not in contact and the front ends 12a, 12a are spaced apart. Thereby, the softness of the main body 8 can be improved in the vicinity of the center line CL in the front-rear direction of the rear region R. On the other hand, the front ends 12a, 12a of the pair of rear compression grooves 12, 12 may be connected. When connected, deformation starting from the connecting portion is facilitated, so that deformation in the rear region R that fits the body can be promoted.

As shown in FIG. 1A, a pair of rear compression grooves 12,12 are provided rearward of a pair of central compression grooves 11,11. The pair of rear compression grooves 12,12 may be spaced rearwardly from the pair of central compression grooves 11,11. That is, the front ends 12a, 12a of the pair of rear compressed grooves 12, 12 may be spaced apart from the rear ends 11b, 11b of the pair of central compressed grooves 11, 11 in the front-rear direction D1. As a result, the compressed grooves become discontinuous in the front-rear direction D1 from the central region M to the rear region R, so that the central region M and the rear region R can move independently. Therefore, it becomes possible to deform to follow the movement of the body, and the fit is improved. However, the pair of rear compressed grooves 12, 12 may partially overlap the pair of central compressed grooves 11, 11 in the front-to-rear direction D1.

In the front region F of the absorbent article 1, a pair of front compression grooves 13, 13 are provided on both sides of the centerline CL in the front-rear direction and spaced from the centerline CL. The pair of front compression grooves 13, 13 extend forward, more specifically, obliquely forward, and have inter-groove width enlarged portions 13c, 13c in which the width between the compression grooves gradually increases toward the front. ing. The inter-groove widened portions 13c, 13c form rear portions of the pair of front compression grooves 13, 13 (closer to the central region M).

Since the pair of front compressed grooves 13, 13 are present, the absorbent body 4 can be easily folded along the pair of front compressed grooves 13, 13, and the planar main body 8 can be fitted to the shape of the body. In addition, since the pair of front compression grooves 13, 13 have groove-width enlarged portions 13c, 13c, the front region F fits well along the curve of the pubic bone protruding roundly on the ventral side of the body. can be made In addition, the pair of front compressed grooves 13, 13 are not the groove width widening portions 13c, 13c in which the width between the compressed grooves gradually increases toward the front, but the portions where the width between the compressed grooves is constant when viewed in the front-rear direction. may contain

The pair of front compression grooves 13, 13 further extend forward of the inter-groove widened portions 13c, 13c. The extension portions are respectively directed toward the center line CL in the front-rear direction, are further folded rearward, and are curved so as to face the outside in the width direction D2 again. In this way, the shape of the pair of front compression grooves 13, 13 is generally heart-shaped as a whole, and the design is high.

In the form shown in FIG. 1A, unlike the pair of rear compressed grooves 12, 12, the pair of front compressed grooves 13, 13 are connected to form a tip (front end) 13a. When the pair of compressed grooves are connected in this manner, the deformation is facilitated starting from the connecting portion, so that the deformation suitable for the body can be promoted. On the other hand, like the pair of rear compression grooves 12, 12, the pair of front compression grooves 13, 13 may be spaced apart, in which case the body 8 near the longitudinal centerline CL of the front region F can improve the softness of

As shown in FIG. 1A, a pair of front compression grooves 13,13 are provided in front of a pair of central compression grooves 11,11. The pair of front compression grooves 13,13 may be spaced forward from the pair of central compression grooves 11,11. That is, the rear ends 13a of the pair of front compression grooves 13,13 may be provided in front of the front ends 11a,11a of the pair of central compression grooves 11,11. As a result, the compressed grooves become discontinuous in the front-rear direction D1 from the central region M to the front region F, and the central region M and the front region F can move independently. As a result, it is possible to deform to follow the movement of the body, and it is possible to fit the body. However, it may partially overlap with the pair of central compressed grooves 11, 11 in the front-rear direction D1.

In addition, in the front region F, a pair of front auxiliary compression grooves 14, 14 may be provided. The pair of front auxiliary compression grooves 14, 14 are respectively behind the pair of front compression grooves 13, 13, i.e., the pair of front compression grooves 13, 13 and the pair of central compression grooves 11, 11 when viewed in the front-rear direction D1. is provided between The presence of the pair of auxiliary front compression grooves 14, 14 can assist the deformation along the front portion (abdominal portion) of the body that is the action of the pair of front compression grooves 13, 13. That is, the front region F is deformed so that the center in the width direction D2 protrudes forward along the curve of the pubic bone, thereby further improving fit.

(Body fluid induction part)
As described above, the absorbent article 1 according to this embodiment has a configuration with a high fitting property due to the compression grooves formed in the front region F and the rear region R. Due to the high fit, the gap between the body and the absorbent article 1 can be reduced or eliminated, so that the discharged body fluid can be immediately absorbed, and the body fluid can flow forward and/or backward along the body. You can prevent it from leaking. However, when a large amount of bodily fluid is discharged at once, even if the bodily fluid is absorbed by the absorbent body 4, it may not be sufficiently diffused in the absorbent body 4 along the front-rear direction D1. Therefore, even if the body fluid can be diffused to the front region F and/or the rear region R, the body fluid may leak from the width direction outside of the front region F and/or the rear region R.

In addition, the absorbent article may be worn, for example, shifted to the left or right from the appropriate wearing position. Such deviations often occur in the front region F and/or the rear region R due to their longitudinally elongated shape. In that case, body fluids tend to leak from the outside of the front region F and/or the rear region R in the width direction.

On the other hand, as shown in FIGS. 1A and 1B, the absorber 4 has a rear body fluid guide portion 45R on the front-rear direction center line CL in plan view. The rear body fluid guide portion 45R overlaps the pair of rear compression grooves 12, 12 when viewed in the front-rear direction D1. That is, the rear edge 45Ra of the rear body fluid guide portion 45R is located behind the front ends 12a, 12a of the rear compression grooves 12, 12. As shown in FIG. At least a portion of the rear edge 45Ra of the rear body fluid guide portion R is arranged between the rear compression grooves 12,12. In the configuration of FIG. 1A, the entire rear edge 45Ra of the rear bodily fluid guide portion R is disposed between the rear compression grooves 12, 12, that is, extends beyond the rear compression grooves 12, 12 in the width direction D2. No.

Here, the rear body fluid guide portion 45R is a portion that has a higher function of drawing liquid from the surrounding absorbent than the surrounding absorbent. By providing such a rear bodily fluid guiding portion 45R, the bodily fluid absorbed by the absorbent body 4 can be prevented from spreading outward in the width direction D2, and can be guided between the pair of rear compression grooves 12, 12. Therefore, leakage to the outside in the width direction D2 in the rear region R can be suppressed.

Hereinafter, with reference to FIG. 2, the function of the rear body fluid guide portion 45R will be described in more detail. FIG. 2 is a partially enlarged view of the absorbent article 1. FIG. In FIG. 2, arrows schematically indicate the flow of bodily fluids.

As indicated by the arrows, the body fluid discharged into the body fluid discharge port corresponding portion A of the central region M first diffuses rearward between the pair of central compression grooves 11 , 11 . Here, since the rear body fluid guide portion 45R is arranged near the body fluid outlet corresponding portion A, the body fluid is drawn into the rear body fluid guide portion 45R and continues to diffuse rearward. At this time, the bodily fluid is guided toward the center in the width direction D2 in the central region M, so that it is difficult to diffuse to the outside in the width direction D2.

Further, when the body fluid reaches a position of the pair of rear compression grooves 12, 12, it moves along the pair of rear compression grooves 12, 12 and is guided between the pair of rear compression grooves 12, 12. In the embodiment of FIG. 2, the rear end edge 45Ra of the rear body fluid guide portion 45R is arranged between the pair of rear compression grooves 12, 12, so that at least part of the body fluid diffusing rearward is more reliably absorbed by the pair of grooves. can be guided between the rear compression grooves 12, 12 of the . Therefore, the absorbent material behind the rear region R, that is, the region between the pair of rear compression grooves 12, 12 and the region behind it can also be utilized, and leakage to the outside in the width direction D2 in the rear region R can be prevented. can be reduced. That is, even if a large amount of body fluid is discharged at one time, the total amount of body fluid discharged increases due to long-term use, or the mounting position is slightly displaced, the entire rear region R can be utilized. , the leakage in the rear region R can be reduced.

In the illustrated embodiment, the rear body fluid guide part 45R overlaps the body fluid discharge port corresponding part A, but is provided near the body fluid discharge port corresponding part A to guide the body fluid between the pair of rear compression grooves 12, 12. It is not necessary to overlap as long as it has an effect that can be induced. However, if the rear body fluid guide portion 45R and the body fluid outlet corresponding portion A overlap each other, the effect of guiding the body fluid is improved. In addition, from the viewpoint of reducing discomfort when the area where the rear body fluid guide portion 45R is provided is in close contact with the body fluid outlet of the wearer, the rear body fluid guide portion 45R is provided at the center Ac of the body fluid outlet corresponding portion A. It is preferred that they do not overlap.

1A, 1B and 2, the shape of the rear body fluid guide part 45R is an isosceles triangle having a vertex behind the absorbent article 1 (on the side of the pair of rear compression grooves 12, 12). , is not particularly limited. The shape of the rear bodily fluid guiding portion 45R may be a polygonal shape other than the triangular shape, such as a quadrangle, a pentagon, or an ellipse, or a shape including or consisting of a part thereof. Further, the shape of the rear body fluid guide portion 45R is preferably line symmetrical (laterally symmetrical), and the line of symmetry of the line symmetry is preferably the front-rear direction center line CL.

Further, the shape of the rear body fluid guide portion 45R may include a portion whose width gradually or stepwise decreases toward the rear, that is, as it approaches the pair of rear compression grooves 12 , 12 . As a result, the body fluid discharged in a large amount at once is guided rearward and diffused sideways little by little, and at least a part of the body fluid is reliably guided between the pair of rear compression grooves 12, 12. - 特許庁can be done. As a result, the effect of preventing leakage in the rear region R can be further improved.

The length of the rear body fluid guiding portion 45R in the front-rear direction D1 is preferably 30 to 80 mm, more preferably 40 to 70 mm. The area of the rear body fluid guiding portion 45R can be set to approximately 100 to 2000 mm ² . Further, the maximum width of the rear body fluid guiding portion 45R can be set to 10 to 35% of the width of the absorbent body 4. FIG.

The configuration of the rear bodily fluid guiding portion 45R is not particularly limited as long as it has a higher function of drawing in liquid than the surrounding absorbent body. It can be formed by utilizing the phenomenon of For example, the rear body fluid guiding portion 45R can be a portion (high density portion) of the absorbent body 4 that has a higher density than the surroundings. Alternatively, it can be constructed using a different material or blend of materials than the surroundings. When using a material different from that of the surroundings, the material of the rear bodily fluid guiding portion 45R can also contain a larger amount of highly hydrophilic material. Also, the basis weight of the polymer contained in the rear bodily fluid guiding portion 45R can be made larger than that of the surroundings.

When the rear body fluid guide portion 45R is a high density portion, its density is preferably 80-170 kg/m ³ , more preferably 90-120 kg/m ³ . Further, the density of the absorbent material other than the rear body fluid guiding portion 45R is about 60 to 100 kg/m ³ . Here, the ratio of the density of the rear body fluid guiding portion 45R to the density of the surrounding absorbent is preferably 1.1 to 3.0, more preferably 1.3 to 2.0.

Incidentally, the density of the absorber can be measured as follows. A portion to be measured (a portion not provided with fit embossing) is cut out to an arbitrary size from the absorbent body, and the area is measured. In addition, the cut-out portion is weighed and the thickness is measured. The thickness can be measured, for example, using a thickness measuring instrument (“Peacock” manufactured by Ozaki Seisakusho Co., Ltd., model number: FFD-7). Then, the density can be calculated from the area, thickness, and weight thus measured.

(Modified example of body fluid guiding part)
3 and 4 show modifications of the rear body fluid guide 45R. FIGS. 3 and 4 show enlarged plan views of the portion where the rear body fluid guide portion R and the pair of rear compression grooves 12, 12 are provided, and details of other configurations are omitted.

In the example of FIG. 3(a), the shape of the rear body fluid guide portion 45R is a quadrangle, more specifically a rectangle. Further, in the example of FIG. 3A, unlike the embodiments shown in FIGS. 1A, 1B, and 2, the rear edge 45Ra of the rear body fluid guide portion 45R has a constant width when viewed in the front-rear direction D1. , and extends beyond the pair of rear compression grooves 12, 12 in the width direction D2 at the positions of the front ends 12a, 12a of the pair of rear compression grooves 12, 12.

In both the example of FIG. 1A and the example of FIG. rearwardly beyond the front ends 12a, 12a of the grooves 12, 12), allowing bodily fluids to be directed between the pair of rear compression grooves 12,12. In the example of FIG. 3A as well, the rear body fluid guide portion 45R has a higher function of drawing in and holding body fluid than the surrounding absorbent body. It is pulled into the portion 45R and guided further backward.

In addition, in the example of FIG. 3(a), the width of the rear bodily fluid guide portion 45R is constant in the front-rear direction D1, so that more bodily fluids can be absorbed in the rear area compared to the configuration tapered toward the rear. R can be derived.

In the example of FIG. 3(b), the shape of the rear body fluid guide portion 45R is semi-elliptical, that is, the shape of a part of an ellipse. In this example, as in the example of FIG. 1A and the like, the rear body fluid guide portion 45R has a shape including a portion whose width gradually decreases toward the rear. The contour of the edge 45Ra is curved.

For example, when the rear body fluid guide portion 45R is formed as a high-density portion so as to have different flexural rigidity, the absorber 4 is bent at the boundary between the rear body fluid guide portion 45R and its surroundings, and that portion is exposed to the skin. may hit. However, if the contour of the rear edge 45Ra of the rear body fluid guide portion 45R is curved as shown in FIG. 3(b), it is possible to reduce discomfort when the boundary touches the skin.

In the example of FIG. 3(c), the width of the rear body fluid guide portion 45R decreases stepwise toward the rear. Although one stepped portion is formed in this example, the shape may be such that two or more stepped portions are formed. In the example of FIG. 3(c), since the rear bodily fluid guiding portion 45R has a portion with a constant width, it is possible to increase the amount of bodily fluid to be guided rearward accordingly, and the edge 45Ra is formed between the pair of rear compression grooves 12. In the example of FIG. , 12, it is possible to increase the amount of body fluid that is guided backward at the center in the width direction D2.

In the example of FIG. 3(d), the pair of rear compressed grooves 12, 12 consist of portions in which the width between the compressed grooves gradually increases toward the rear. There is no extension to go. Therefore, the flexibility of the rear portion of the rear region R can be improved. Also in this example, as in the example of FIG. It does not overlap or touch the rear compression grooves 12, 12 in plan view. In this example, while part of the body fluid can be guided backward along the pair of rear compression grooves 12, 12, the width of the rear body fluid guide portion 45R can be reduced. Therefore, when the rear body fluid guiding portion 45R is configured as, for example, a high density portion, the flexibility of the absorber 4 can be improved by reducing the width.

On the other hand, in the examples shown in FIG. 1A and the like and FIGS. , or overlapping. This makes it easier to guide body fluid from the rear body fluid guide portion 45R to the pair of rear compression grooves 12, 12, so that the amount of body fluid guided and diffused rearward can be increased.

In the example of FIG.3(e), the width|variety between a pair of back compression grooves 12 and 12 is substantially constant in the front-back direction D1. In such an example as well, the rear region R can be deformed so as to be raised so as to fit to the groove of the buttocks. As in the example shown in FIGS. 3A to 3C, the rear body fluid guiding portion 45R can guide and diffuse the body fluid between the pair of rear compression grooves 12, 12, and the pair of rear compression grooves. From the front ends 12a, 12a of 12, 12, which are in contact with the rear bodily fluid guide portion 45R, it can be guided rearward along the pair of rear compression grooves 12, 12. As shown in FIG.

In the example shown in FIGS. 4A and 4B, the shape of the rear body fluid guide portion 45R is the same as the example shown in FIG. 1A and the like, but the configuration inside the rear body fluid guide portion 45R is different. In the example of FIG. 4(a), the posterior body fluid guide portion 45R is composed of a high density portion, but an ultra-high density portion 45h having a higher density within the posterior body fluid guide portion 45R. ' is formed. The ultra-high density portion 45h' is a striped portion extending in the front-rear direction D1.

The ultra-high density portion 45h' has a particularly high function of drawing in body fluid even in the rear body fluid guiding portion 45R. Induction can be facilitated.

In the example of FIG. 4A, three ultra-high density portions 45h' are provided, but the number is not particularly limited. However, it is preferable that the super-high-density portion 45h' is located at the center of the rear body fluid guide portion 45R in the width direction D2, preferably on the longitudinal center line CL, because the effect of guiding body fluid to the center of the width direction D2 is enhanced.

In the example of FIG. 4(b), the rear body fluid guide portion 45R is formed by dividing the high density portion 45h and the ultra-high density portion 45h' into two regions in the front-rear direction D1. In this example, the bodily fluid drawn into the rear bodily fluid guide portion 45R is further drawn from the high density portion 45h to the ultra-high density portion 45h'. can.

In this specification, expressions such as high density, ultra-high density, and low density are used to indicate relative properties in the absorbent body 4, and specific density values or density values are used. It does not indicate a range.

The configuration and function of the rear body fluid guide portion 45R in the rear region R have been mainly described above with reference to the drawings. The original relationship can be explained in the same way, has the same effect, and can be modified or changed in the same way. Also, the modifications described with reference to FIGS. 3 and 4 are applicable to the front bodily fluid guide portion 45F and the pair of front compression grooves 13, 13 as well.

A predetermined configuration including the front body fluid guide portion 45F and the front compression grooves 13, 13 and a predetermined configuration including the rear body fluid guide portion 45R and the rear compression grooves 12, 12 according to the present embodiment are Either one or both may be provided depending on the purpose and method of use.

(Formation of bodily fluid guiding portion)
FIG. 5 shows an example of a method of forming the rear body fluid guide portion 45R and/or the front body fluid guide portion 45F (simply referred to as the body fluid guide portion 45). FIG. 5 shows an example of forming a high-density portion with a press die P. As shown in FIG. FIG. 5(a) shows the state before the stack 4s to be the absorbent body 4 is pressed by the press die P1, and FIG. Shows the state after removal.

In the example of FIG. 5, the stack 4s has a uniform thickness. The fiber stack 4s is pressed with a press die P1 having a convex portion corresponding to the portion where the body fluid guide portion (high-density portion) 45 is desired to be formed in the absorbent body 4 (FIG. 5(a)). As shown in FIG. 5(b), an absorbent body 4 is obtained in which the thickness of the body fluid guiding portion (high density portion) 45 is smaller than the thickness of the surrounding portion.

In the example of FIG. 5, the body fluid guiding portion (high-density portion) 45 is recessed, and the thickness thereof is smaller than the thickness of the surrounding absorbent body 4 . When the absorbent body 4 formed in this way is used in the absorbent article 1, the upper side in the figure may be the surface side (the side where the depression is formed may be the surface side), or The lower side may be the front side (the side with the depression may be the back side). In either case, it has the effect of drawing in body fluid and guiding it backward and/or forward, but in the former case (when the depression is on the surface side), the body fluid is retained in the depression at least temporarily. Therefore, even when a large amount of bodily fluid is discharged, it is possible to prevent leakage of the absorbent body 4 to the outside. Moreover, in the latter case (where the recess is on the back side), the front side of the absorbent body 4 is flat, so that discomfort during wearing is reduced.

FIG. 6 shows another example of the method of forming the bodily fluid guide portion 45. As shown in FIG. In the example shown in FIG. 6, similarly to the example in FIG. 5, the high-density portion is formed by the press die P2. FIG. 6(a) shows the state before the stack 4s to be the absorbent body 4 is pressed by the press die P2, and FIG. Shows the state after removal.

In the example of FIG. 6, unlike the example of FIG. 5, the thickness of the fiber stack 4s to be the absorbent body 4 is not uniform, and the thickness of the portion where the body fluid guide portion (high density portion) 45 is desired to be formed is increased. (Fig. 6(a)). The thickness of the bodily fluid guide portion (high density portion) 45 is reduced by pressing the stack 4s having such a thick portion with a press die P2 having a flat surface, as shown in FIG. 6(b). An absorber 4 having a uniform thickness and a uniform peripheral thickness can be obtained.

1 Absorbent article 2 Back sheet 3 Top sheet 4 Absorbent body 4s Stacking body 11 Central compressed groove 11a Front end 11b of central compressed groove Rear end 12 of central compressed groove Rear compressed groove 12a Front end 12c of rear compressed groove Groove of rear compressed groove Enlarged width portion 13 Front compression groove 13a Rear end 13c of the front compression groove Groove width expansion portion 45F of the front compression groove Front bodily fluid guide portion 45Fa Front edge 45R of the front bodily fluid guide portion Rear bodily fluid guide portion 45Ra Rear bodily fluid guide portion Rear edge 45h High-density portion 45h' Ultra-high-density portion A Body fluid outlet corresponding portion CL Front-back direction center line F Front region M Central region R Rear region D1 First direction D2 Second direction

Claims (5)

A sanitary napkin elongated in the front-rear direction and having a liquid-permeable topsheet, a liquid-impermeable backsheet, and an absorbent body provided between the topsheet and the backsheet,
A pair of compression grooves are provided on both sides of the center line extending in the front-rear direction in at least one side region in the front-rear direction from the central region including the body fluid outlet corresponding portion corresponding to the body fluid outlet of the wearer when worn,
The pair of compression grooves may be a compression groove to fit along the gluteal groove and/or a compression groove to fit along the curve of the pubic bone, extending toward the one side and moving toward the one side. Including a portion where the width between the compressed grooves gradually increases or a portion where the width between the compressed grooves is constant when viewed in the front-back direction,
The absorbent body has a bodily fluid guiding portion overlapping the pair of compressed grooves on one side when viewed in the front-rear direction on the center line, and the bodily fluid guiding portion is formed by compressing the entire body fluid guiding portion. and has a maximum width that is 10 to 35% of the width of the absorbent body,
At least part of the one-side edge of the bodily fluid guide portion is disposed between the pair of compression grooves, and the other-side edge of the bodily fluid guide portion in the front-rear direction is included in the central region,
The bodily fluid guiding portion is a sanitary napkin that overlaps the center line over a length of 30 to 80 mm in the front-rear direction. 2. The sanitary napkin according to claim 1, wherein said one edge of said bodily fluid guiding portion is disposed between said pair of compression grooves. A pair of central compression grooves are provided on both sides of the center line and extend substantially in the front-rear direction so as to include the body fluid outlet corresponding parts when viewed in the front-rear direction,
3 . The sanitary napkin according to claim 1 , wherein the body fluid guide portion overlaps the one side portion of the pair of central compressed grooves on the other side in the front-rear direction when viewed in the front-rear direction. the other-side ends of the pair of compressed grooves are separated in the front-rear direction from the one-side ends of the pair of central compressed grooves;
4. The sanitary napkin according to claim 3, wherein said other side end of said pair of compressed grooves is arranged inside said one side end of said pair of central compressed grooves when viewed in the width direction. . The sanitary napkin according to any one of claims 1 to 4, wherein the bodily fluid guiding portion includes a portion whose width gradually or stepwise decreases toward the one side.

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