WO2019082677A1 - Absorbent article - Google Patents

Abstract

Disclosed is an absorbent article which is provided with a top sheet having a protrusion/recess area therein, a rear sheet, and an absorber interposed between these two sheets, and which has a longitudinal direction corresponding to the front-rear direction of a wearer and a widthwise direction that is orthogonal to said longitudinal direction, wherein: the protrusion/recess area (P) has formed therein a plurality of inclined protrusion parts (41); and each of the inclined protrusion parts (41) protrudes toward the skin side of the wearer, and has a top (t) positioned in such a manner as to be offset from the center position (41c) between both ends of the inclined protrusion part (41) in the longitudinal direction (X) toward one side in the longitudinal direction (X).

Description

Absorbent articles

The present invention relates to absorbent articles such as disposable diapers, urine absorbing pads, incontinence pads, sanitary napkins and the like.

Conventionally, for the purpose of suppressing the flow of excrement on the surface sheet or controlling the flow direction to a specific direction, the skin facing surface side of the surface sheet of an absorbent article such as a disposable diaper has a three-dimensional shape and Technology is known.
For example, Patent Document 1 includes, as a non-woven fabric used as a surface sheet or the like of a disposable diaper, a base extending in a substantially planar shape, and a plurality of projections projecting from the base, each projection being the base A nonwoven fabric comprising: a circumferential surface portion which stands up from the surface to form a circumferential surface; and a top portion formed on the tip side of the circumferential surface portion, the circumferential surface portion having a projecting portion projecting outward on at least a part of the circumferential surface Is described.
In addition, also for the present applicant, as a surface sheet of the absorbent article, the laminated first sheet and second sheet are bonded to each other at a plurality of bonding portions, and the first sheet is at a portion other than the bonding portion. It has been proposed to use a composite sheet that protrudes in a direction away from the second sheet and forms a convex portion that protrudes toward the skin side of the wearer (Patent Document 2 and the like).

JP, 2016-8367, A JP, 2017-93732, A

The present invention comprises a top sheet having a concavo-convex area, a back sheet, and an absorber disposed between the two sheets, and an absorbent having a longitudinal direction corresponding to the longitudinal direction of the wearer and a width direction orthogonal to the longitudinal direction. Sex goods. A plurality of inclined protrusions are formed in the uneven region. The inclined convex portion protrudes toward the skin side of the wearer, and the position of the top is biased to one side in the longitudinal direction from the central position between the longitudinal ends of the inclined convex portion.

FIG. 1 is a plan view showing the basic configuration of a disposable diaper as an embodiment of the absorbent article of the present invention. FIG. 2 is a cross-sectional view taken along line II-II of FIG. FIG. 3: is a top view which shows the surface sheet (composite sheet) of the disposable diaper of 1st Embodiment. FIG. 4 is an enlarged plan view showing a part of the uneven region P of the composite sheet shown in FIG. 5 is an enlarged cross-sectional view showing a cross section along the thickness direction of the surface sheet (composite sheet) shown in FIG. 3, and FIG. 5 (a) is a top of the inclined convex portion along the line III-III in FIG. 5 (b) is a cross-sectional view taken along the line IV-IV of FIG. FIG. 6 is an explanatory view of the effect of the present invention, and FIG. 6 (a) is an operation view of the present invention, and FIG. 6 (b) is an operation view of the prior art. FIG. 7 is an explanatory view of the effect of the present invention, FIG. 7 (a) is an operation view of the present invention, and FIG. 7 (b) is an operation view of the prior art. FIG. 8: is an enlarged plan view (a) which expands and shows a part of uneven | corrugated area | region of the surface sheet (composite sheet) which concerns on 2nd Embodiment, and an enlarged view (b) of an inclined convex part. FIG. 9 is an explanatory view of the effect of the inclined convex portion in the same inclined region, and FIG. 9 (a) is an operation view when friction occurs along the inclined direction of the inclined convex portion, and FIG. It is an action view when friction arises along the direction opposite to the inclination direction.

Detailed Description of the Invention

According to the non-woven fabric proposed in PTL 1, the circumferential surface portion of the convex portion is provided with the projecting portion protruding outward from the circumferential surface in Patent Document 1 in a case where the non-woven fabric can be inclined. It is described that the projection can stop the flow of the liquid, as a result, the liquid does not flow easily on the non-woven fabric, and the liquid can be efficiently absorbed and permeated.
However, in the nonwoven fabric of Patent Document 1, the rigidity of the convex portion is enhanced in order to maintain the convex shape even under pressure, and, for example, when the excrement has a relatively high viscosity such as soft stool, etc. The disadvantage that the excrement left behind is likely to adhere to the skin of the wearer is not resolved.
Moreover, although the surface sheet which consists of a composite sheet described in Patent Document 2 is excellent in air permeability and liquid drawability, when the excrement is soft stool, the viewpoint of controlling the flow of the soft stool, It is not sufficient in terms of preventing excrement from remaining on the top sheet and adhering to the skin of the wearer.

Accordingly, the present invention relates to an absorbent article which can eliminate the drawbacks of the prior art mentioned above.

Hereinafter, the present invention will be described based on its preferred embodiments with reference to the drawings.
1 and 2 show the basic structure of a disposable diaper 100 (hereinafter, also simply referred to as a diaper 100) which is an embodiment of the absorbent article of the present invention.
The diaper 100 comprises a liquid-permeable top sheet 12, a liquid-impermeable back sheet 13, and an absorbent body 14 disposed between the two sheets 12, 13 as shown in FIGS. The liquid impermeability of the back sheet 13 is a concept including liquid impermeability, and includes the case where the back sheet 13 does not pass the liquid at all, the case where the back sheet 13 is made of a water repellent sheet, and the like.

The diaper 100 has a longitudinal direction X corresponding to the longitudinal direction of the wearer, and a width direction Y orthogonal to the longitudinal direction X in a state where the diaper 100 is spread in a planar shape as shown in FIG. There is. In the diaper 100, the entire length in the longitudinal direction X is equally divided into three, and the belly side A is disposed on the front side of the wearer when worn, the back side B disposed on the back side of the wearer when worn, It can be divided into a crotch portion C located between the ventral side A and the dorsal side B. The diaper 100 is a spread-type disposable diaper, and fastening tapes 17 are provided on both side edges of the back side B, and a landing zone 18 for fastening the fastening tape 17 on the outer surface of the abdominal side A Is provided.

The absorbent 14 in the diaper 100 includes an absorbent core 14 a and a core wrap sheet 14 b that wraps the absorbent core 14 a. The absorbent core 14a can be composed of, for example, a piled body of liquid absorbent fibers such as pulp fibers, or a mixed piled body of liquid absorbent fibers and a water absorbent polymer. Examples of the absorbent fibers include cellulose-based hydrophilic fibers such as pulp fibers, rayon fibers, cotton fibers and cellulose acetate. In addition to the cellulose-based hydrophilic fibers, fibers obtained by hydrophilizing fibers made of synthetic resins such as polyolefin, polyester, and polyamide with a surfactant or the like can also be used. For example, a tissue paper or a water-permeable nonwoven fabric is used as the core wrap sheet 14b. The core wrap sheet 14 b may wrap the whole of the absorbent core 14 a by one sheet, or may combine two or more sheets to wrap the absorbent core 14 a. As the back surface sheet 13, a liquid impermeable or water repellent resin film, a laminate sheet of a resin film and a non-woven fabric, or the like is used.

A sheet 15 for forming a solid gather having an elastic member 15a is disposed on both sides in the longitudinal direction X of the diaper 100, and contraction of the elastic member 15a causes the crotch C in the worn state to be on the skin side of the wearer Solid gathers are formed to stand up to the In addition, the leg elastic member 16 is disposed in a stretched state at a portion disposed around the leg in the crotch C, and the contraction thereof causes the crotch C in the worn state to fit around the leg of the wearer. Leg gathers are formed to improve

The top sheet 12 in the disposable diaper 100 according to the first embodiment is composed of the composite sheet 10 shown in FIG.
As shown in FIG. 3, the composite sheet 10 has a central area M located at the center in the width direction Y and a pair of side areas S and S located on both sides of the central area M. The uneven | corrugated area | region P in the surface sheet 12 is formed.

The uneven region P is a region in which a plurality of inclined convex portions 41 formed of a fiber sheet such as a non-woven fabric is formed, and the inclined convex portions have a predetermined pattern as shown in FIG. Preferably, it is formed in a dispersed state.
As shown in FIG. 5A, the inclined convex portion 41 protrudes toward the skin side of the wearer, and the position of the top t is the center between both ends e1 and e2 in the longitudinal direction X of the inclined convex portion 41. It is a convex portion biased to one side in the longitudinal direction X from the position 41 c. The both ends e1 and e2 of the inclined convex portion 41 are both ends in a cross section along the longitudinal direction X of the absorbent article, preferably in the cross section passing through the top t. Further, both ends are the rising base ends of the inclined convex portion 41.
The one side where the position of the top t is biased is the front side (lower side in FIG. 1) or the rear side (upper side in FIG. 1) in the longitudinal direction X of the absorbent article, as shown in FIG. The position of the top t may be an inclined convex that is biased to the front side from the central position 41c, or the position of the top t may be an inclined convex that is biased to the rear than the central position 41c (not shown) ). Hereinafter, the inclined convex portion 41 in which the position of the top t is biased to the front side from the central position 41c is also referred to as a front inclined convex portion, and the inclined convex portion in which the position of the apex t is biased to the rear side from the central position 41c is also referred to as a rear inclined convex portion.

The position of the top t of the inclined convex portion 41 is a distance within 5% of the center position 41c within a range of 5% when the length L2 (FIG. 2A) between the both ends e1 and e2 of the inclined convex portion 41 is 100%. It is preferable to be out of the range, and it is more preferable to be outside the range of distance within 10% of the center position 41c.

The composite sheet 10 in the disposable diaper 100 according to the first embodiment has a sloped convex portion which is a front sloped convex portion formed over the entire central region M where the concavo-convex region P is formed. In the uneven region P, a front sloped convex portion is formed in any of the portion located on the back side B, the portion located on the crotch C, and the portion located on the abdominal side A, Instead of this, on the portion of the top sheet 12 located on the dorsal side B, a front inclined convex portion is formed in which the position of the top t is biased to the front side, while on the portion located on the abdominal side A, A rear sloped convex portion may be formed in which the position of the top t is biased to the rear side. In addition, the crotch C may be formed with a front sloped convex portion, or may be formed with a rear sloped convex portion, and the position of the top t does not lie in the central position between both ends of the convex portion. An inclined convex portion may be formed.
In addition, the disposable diaper 100 is divided into two at the widthwise center line dividing the entire length in the longitudinal direction into two equal parts, the front inclined convex part in one area on the rear side and the rear inclined convex part in the other area on the front side You may form

According to the disposable diaper 100 of the first embodiment, since the uneven region P in which the plurality of inclined convex portions 41 are formed is provided, in the uneven region P, as shown in FIG. The movement of the excrement U supplied on the surface sheet 12 is effectively prevented by the inclined convex portion 41 acting as a steric barrier, as shown by the arrow a 1. Diffusion can be effectively suppressed. Therefore, it can be effectively suppressed that the excrement U migrates on the top sheet 12 and diffuses in a region or direction in which it is not desired to diffuse.
For example, as in the present embodiment, by providing the front sloped convex portion in the portion positioned on the back side B of the surface sheet 12, it is possible to effectively suppress leakage of excrement such as soft feces from the back side. be able to. Further, by providing the rear inclined convex portion in the portion located on the ventral side portion A of the surface sheet 12, it is possible to effectively suppress leakage of excrement such as soft feces from the ventral side. In the surface sheet 12 in the present invention, only one of the front inclined convex portion and the rear inclined convex portion may be formed over the entire area or the entire central region M.

Further, in the present embodiment, the periphery of each inclined convex portion 41 is surrounded by the concave portion 30 (see FIG. 5) in which the bonding portion 3 is discontinuously formed in the bottom portion. The excrement U is likely to move to the absorber 14 through a portion other than the joint portion 3 as indicated by the arrow a2. Therefore, it is further excellent in the diffusion inhibitory effect of the excretion U to the site | part and direction which you do not want to diffuse.
On the other hand, in the case of the non-inclined convex portion 43 in which the position of the top t is at the central position 43c between both ends in the longitudinal direction X, as shown in FIG. It is easy for the excrement U such as urine and loose stool to move over the non-inclined convex portion 43, and it is difficult to control the diffusion of the excrement U sufficiently.

Further, as in the present embodiment, when the top sheet 12 has the uneven region P in which the plurality of inclined convex portions 41 are formed, the inclined surface is inclined in a state where the excrement U is accumulated in the concave portion 30 between the inclined convex portions 41. When the convex part 41 is pressurized by the skin 7 of a wearer as shown to Fig.7 (a), the inclination convex part 41 falls easily in the state which covered the wide range of the excretion U. As shown in FIG. Moreover, the inclined convex part 41 in the state which fell down like that WHEREIN: The part to which the excrement U does not adhere is easy to contact the wearer's skin 7. FIG. Therefore, adhesion of excrement U to the wearer's skin 7 is also prevented.
Furthermore, when the inclined convex portion 41 falls down so as to cover all or part of the excrement U, a part of the excrement U is pushed by the inclined convex portion 41 toward the absorber 14 side.
In this manner, in the uneven region P in which the inclined convex portions 41 are formed, the excrement remaining in the concave portions 30 between the convex portions can be efficiently made difficult to adhere to the skin of the wearer .
Such an effect is that the periphery of each inclined projection 41 is surrounded by a recess 30 (see FIG. 5) in which the joint 3 is discontinuously formed at the bottom, and the joint 3 at the bottom of the recess 30 is When the excrement U is likely to move to the absorber 14 through other parts, it is more reliably played.

On the other hand, in the case of the conventional non-inclined convex portion 43 in which the position of the top t is at the central position 43c between both ends in the longitudinal direction X, as shown in FIG. In the state where excrement U is accumulated in the recess 30, when the surface sheet 12 'is pressed by the skin 7 of the wearer, the excrement U easily adheres to the skin 7 of the wearer. When the non-inclined convex portion 43 is made rigid so that the excrement U accumulated in the concave portion 30 between the non-inclined convex portions 43 does not easily adhere to the skin 7 of the wearer, the excrement by the convex portion 43 The pushing effect of U can not be obtained.

From the viewpoint of ensuring one or more of the effects described above to be more reliably exhibited, the inclined convex portion 41 present in the concavo-convex area P has the position of the top t deviated like the inclined convex portion 41 a shown in FIG. 5 Preferably, the rising portion g on one side of the longitudinal direction X is inclined in a state of being inclined to the one side than the vertical. Here, perpendicular means that the direction is perpendicular to a plane (plane orthogonal to the thickness direction) F extending in parallel to the surface of the surface sheet 12, and in a state of being inclined to the one side with respect to the perpendicular, as shown in FIG. When the position of the top t is deviated to the front side from the central position 41c as in the case of the inclined convex portion 41a shown in FIG. 5, the position of the top t of the inclined convex portion 41a is the center In the case of being biased backward from the position 41c, it is in a state of being tilted backward.
In the inclined convex portion 41a shown in FIG. 5, the rising portion g on the front side in the longitudinal direction X in which the position of the apex t is deviated is inclined to the front side with respect to the vertical, and the inclined convex portion 41a is An overhanging portion is provided on the front side (one side) where the position is biased. As a result, when the top sheet 12 is pressed against the skin 7 of the wearer, the inclined convex portion 41 is more likely to fall to the state of covering a wide range of the excrement U, and the excrement U to the skin of the wearer. Adhesion is suppressed more effectively.
The rising portion g of the inclined convex portion 41 is less than 90 °, assuming that the inclination angle θ with respect to a plane (plane orthogonal to the thickness direction) F extending in parallel with the surface of the surface sheet 12 is 90 °. Is more preferably 30 ° or more and less than 80 °, and still more preferably 45 ° or more and 60 ° or less.

From the viewpoint of preventing the concave 30 from being covered with the inclined convex 41 in advance, the inclined convex 41 has the position of the top t, the position of the top t, as the inclined convex 41a shown in FIG. 5A. It is preferable not to exceed the position of the end e1 on the opposite side (rear side) to the one side (front side) of the other inclined convex part 41b adjacent to the one side (front side) in which the B is biased. As a result, the excrement U easily enters the recess 30 between the inclined convex portions 41, and the transferability of the excrement U to the absorber 14 is improved.

Further, as shown in FIG. 4 and FIG. 5, the inclined convex portion 41 in the present embodiment has a horizontally long planar view shape in which the length L1 of the absorbent article in the width direction Y is longer than the length L2 of the longitudinal direction X ing. When the inclined convex portion 41 has a horizontally long planar view shape, the inclined convex portion 41 easily falls down in a state of covering the excrement U when pressed by the skin 7 of the wearer, for example, Two or more effects are more likely to be exhibited. In the inclined convex portion 41, the length L1 in the width direction Y is preferably 1.1 times or more, more preferably 1.5 times or more, and preferably 6.0 times or less of the length L2 in the longitudinal direction X More preferably, it is 4.0 times or less, Preferably it is 1.1 times or more and 6.0 times or less, More preferably, it is 1.5 times or more and 4.0 times or less.
In addition, from the viewpoint of controlling the diffusion of excrement in the longitudinal direction, the length L1 of the widthwise direction Y of the inclined convex portion 41 is preferably 3 mm or more, more preferably 5 mm or more, and preferably 100 mm or less, more preferably It is 75 mm or less, preferably 3 mm or more and 100 mm or less, more preferably 5 mm or more and 75 mm or less.

Further, in the concavo-convex region P of the present embodiment, the laminated first sheet 1 and second sheet 2 are joined to each other at the plurality of joining portions 3 and the first sheet 1 is a portion other than the joining portion 3 In the direction away from the second sheet 2 to form an inclined convex portion 41.
Thereby, the three-dimensional shape of the inclined convex portion 41 formed by the first sheet 1 is stably maintained, and by fixing the vicinity of the rising base end of the inclined convex portion 41 to the second sheet 2, the inclined convex portion 41 is easy to fall around the rising proximal end as an axis. Moreover, it is also prevented that the shape of the inclined convex part 41 collapse | crumbles and it becomes impossible to express an effect, during wear of an absorbent article. This makes the one or more effects described above more likely to be exhibited. In the present embodiment, as shown in FIG. 5, in the composite sheet 10 constituting the uneven area P of the surface sheet 12, the surface on the side of the second sheet 2 is substantially flat, and the surface is inclined toward the first sheet 1. A large unevenness is formed by the convex portion 41 and the concave portion 30 between the inclined convex portions.

From the same point of view, as shown in FIGS. 3 and 4, the surface sheet 12 has a plurality of inclined convex portions in the longitudinal direction X in which the position of the top t is biased to the same side in the longitudinal direction X. It is preferable to have convex part row R1 lined up along and to partially have portions 31 and 32 consolidated by embossing between the inclined convex parts 41 and 41 in the convex part row R1.
In the present embodiment, the first bonding portion 31 in which the first sheet 1 and the second sheet 2 are fused by heat embossing as the portions 31 and 32 consolidated by embossing is similarly heated. It has the 2nd junction part 32 by which between the 1st sheet 1 and the 2nd sheet 2 was fusion-bonded by embossing.

As the first sheet 1 of the composite sheet 10 in the present embodiment, for example, a non-woven fabric, a woven fabric, a knitted fabric, or the like is used as the fiber sheet forming the inclined convex portion 41, and is preferably a non-woven fabric. As the second sheet 2 partially joined to the first sheet 1 to form the composite sheet 10, sheet materials made of various materials such as non-woven fabric, woven fabric, fibrous sheet such as woven fabric and film, etc. can be used. . The types of sheet materials constituting the first sheet 1 and the second sheet 2 may be the same or different. The sheet material constituting the second sheet 2 may be a mesh or the like.

As a nonwoven fabric in the case of using a nonwoven fabric as a sheet material which constitutes the 1st sheet 1 or the 2nd sheet 2, an air through nonwoven fabric, a spunbond nonwoven fabric, a spunlace nonwoven fabric, a meltblown nonwoven fabric, a resin bond nonwoven fabric, a needle punch nonwoven fabric etc. are mentioned, for example Be It is also possible to use a laminate in which two or more of these nonwoven fabrics are combined, or a laminate in which these nonwoven fabrics are combined with a film or the like. Among these, it is preferable to use an air through nonwoven fabric or a spunbond nonwoven fabric. The basis weight of the non-woven fabric used as the sheet material constituting the first sheet 1 and the second sheet 2 is preferably 10 g / m ² or more, more preferably 15 g / m ² or more, and preferably 40 g / m ² or less. More preferably, it is 35 g / m ² or less. The basis weight of the non-woven fabric is preferably 10 g / m ² or more and 40 g / m ² or less, and more preferably 15 g / m ² or more and 35 g / m ² or less.

As a fiber which comprises a nonwoven fabric, the fiber which consists of various thermoplastic resins can be used. Examples of the thermoplastic resin include polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate, polyamides such as nylon 6 and nylon 66, polyacrylic acid, polymethacrylic acid alkyl ester, polyvinyl chloride, polyvinylidene chloride and the like. These resins can be used alone or as a blend of two or more. Moreover, it can be used in the form of a composite fiber such as a core-sheath type or a side-by-side type.

The uneven region P of the top sheet 12 in the present embodiment will be further described. In the uneven region P, as shown in FIG. It is formed to be dispersed in the width direction Y. More specifically, as shown in FIG. 3, the inclined convex portions 41 are arranged in a zigzag shape, and a longitudinal convex portion row in which a plurality of inclined convex portions 41 are arranged in series along the longitudinal direction X at constant intervals. A plurality of rows R1 are formed in the width direction Y, and in the longitudinal direction convex portion rows R1 adjacent in the width direction Y, the arrangement positions of the inclined protrusions 41 are shifted by a half pitch in the longitudinal direction X. Further, the inclined convex portions 41 of the longitudinal direction convex portion row R1 adjacent in the width direction Y overlap so that the portions thereof are alternately arranged in the longitudinal direction X. With such an arrangement, a barrier by the inclined convex portion 41 exists in the entire area in the width direction Y, and diffusion of excrement in the longitudinal direction can be effectively suppressed.
Further, in the concavo-convex region P, a plurality of width direction convex portion rows R2 in which a plurality of inclined convex portions 41 are connected in series along the width direction Y at constant intervals are formed in a plurality of rows in the longitudinal direction X.

Between the inclined convex portions 41 adjacent to each other in the longitudinal direction X in the longitudinal direction convex portion row R 1, as shown in FIG. 4, the first longitudinal first having a length b in the longitudinal direction X longer than a length a in the width direction Y A joint 31 is formed. Further, the first bonding portion 31 is positioned between the inclined convex portions 41 adjacent in the width direction Y in the width direction convex portion row R2. The first joint portion 31 between the inclined convex portions 41 adjacent in the width direction Y is the first joint portion 31 located between the inclined convex portions 41 in the longitudinal direction convex portion row R1 adjacent in the width direction. In the longitudinally-long first bonding portion 31, the length b in the longitudinal direction X is preferably 1.2 times or more, more preferably 1.5 times or more the length a in the width direction Y, and preferably 5. It is 0 times or less, more preferably 3.0 times or less, preferably 1.2 times or more and 5.0 times or less, more preferably 1.5 times or more and 3.0 times or less.

Each of the inclined convex portions 41 is surrounded by the first bonding portion 31 and a second bonding portion 32 whose length in the longitudinal direction is shorter than that of the first bonding portion 31. Each of the inclined convex portions 41 is surrounded by the four or more joints 3 to form a concave portion 30 surrounding the individual inclined convex portions 41. Further, the concave portions 30 surrounding the plurality of inclined convex portions 41 are continuous with one another, and continuous concave portions continuous in a mesh shape are formed in portions other than the inclined convex portions 41 in the uneven region P.
When the joined portion between the first sheet 1 and the second sheet 2 is collectively referred to as a joined portion 3, the number of joined portions 3 surrounding the individual inclined convex portions 41 is preferably 4 or more, more preferably 8 or more. And preferably 20 or less, more preferably 16 or less. It is preferable that the number of bonding portions 3 be provided as a pair sandwiching the inclined convex portions 41 from both sides in the longitudinal direction X or a pair sandwiching the inclined convex portions 41 from both sides in the width direction Y.

The second bonding portion 32 has a length d in the longitudinal direction X of preferably 20% to 85%, and more preferably 30% to 70% of the length b of the first bonding portion 31 in the longitudinal direction. . The length c of the second bonding portion 32 in the width direction Y is preferably 0.8 or more and 1.2 or less of the length a of the first bonding portion 31 in the width direction Y, and more preferably 0. 9 or more and 1.1 or less.

Between the inclined convex portions 41 adjacent in the longitudinal direction X, such as a plurality of inclined convex portions 41 included in the same longitudinal convex portion row R1, the first sheet (sheet material) forming the inclined convex portions 41 is partially It is preferable to have a densified part, and as in this embodiment, the inclined convex part 41 is formed from the composite sheet 10 having the joint part 3 between the first sheet 1 and the second sheet 2 In the case where it is carried out, it is preferable that the joint portion is a portion which is partially pressurized and consolidated by embossing or the like. When the single-layer sheet material is partially compressed under pressure, or when the bonding portion 3 between the first sheet 1 and the second sheet 2 is partially compressed by embossing or the like, the pressure and compression The portion where it becomes, becomes the consolidation section where density is raised vis-a-vis the other section, as for slope convex section 41 starting from near the end of this consolidation section as a starting point, the wide range of excrement U inside recess 30 It is preferable because it tends to fall down so as to cover.
Furthermore, the consolidation portion formed between the inclined convex portions 41 has one side and the other side of the inclined convex portions 41 with respect to the density of the end 3a on the one side (front side or rear side) where the position of the top t is biased. It is more preferable from the same viewpoint that the density of the opposite side (rear side or front side) end 3b is high.

The densities of the one end 3a and the other end 3b of the consolidation part are measured as follows.
[Method of measuring density of end of consolidation part]
The density of the end of the consolidation part is obtained by cutting out a 1.0 mm × 1.0 mm measuring piece from each end of the consolidation part in the longitudinal direction X, and the plane area of the measuring piece is 1.0 mm ² The volume (mm ³ ) of the measurement piece is determined by multiplying the thickness of the measurement piece, the value (mm ³ ) of this volume is converted to “cm ³ ”, and the weight (g) of the measurement piece is the volume (cm ^3). It can obtain by dividing by). The weight of the measurement piece is an average value obtained by dividing each of the measurement pieces cut out from both ends of the consolidation part by 5 or more each with a balance and dividing by the number of the measurement pieces. The thickness of the measurement piece is a digital microscope (a product made by Keyence) cut at a position of 0.5 mm in the same direction X from both ends in the longitudinal direction X of the consolidation part using a sharp blade in the direction of the width direction Y ), And the distance from the lower surface to the upper surface of the consolidation part in the central part of the cross section in the width direction is measured to obtain a value. Let thickness be an average value which measured a minimum of five test pieces about each end of a consolidation part.

From the viewpoint of ensuring one or more of the effects described above to be more reliably exhibited, the height H1 (see FIG. 5A) of the inclined convex portion 41 is preferably 1.0 mm or more, more preferably 2 It is not less than 0. 0 mm, preferably not more than 5.0 mm, more preferably not more than 4.0 mm, preferably not less than 1.0 mm and not more than 5.0 mm, more preferably not less than 2.0 mm and not more than 4.0 mm. When the non-inclined convex portions are present in the uneven region P, the height of the non-inclined convex portions may be the same as or different from that of the inclined convex portions 41, but in one example, the inclined convex portions 41 Slightly lower than The preferable range of the height of the non-inclined convex portion is the same as the preferable range of the height of the inclined convex portion described above.
When the concavo-convex region P is formed of the composite sheet 10 having the joint portion 3 between the first sheet 1 and the second sheet 2, the height of the inclined convex portion 41 is the second sheet 2 as shown in FIG. The distance from the lower surface of the first sheet 1 to the upper surface of the first sheet 1 is defined. The height is a value obtained by observing the cross section of each convex portion using a digital microscope (manufactured by Keyence) and measuring the shortest distance between the lower surface of the second sheet 2 and the top of the convex portion.
When the concavo-convex region P is formed of a single-layer sheet material, the height of the inclined convex portions is the straight line connecting the tops of the inclined convex portions adjacent in the longitudinal direction X and the most positioned between the inclined convex portions The height difference with the lower surface of the portion away from the straight line is taken as the height of the inclined convex portion.

The position of the top portion t of the sloped convex portion 41, the height of the sloped convex portion 41, and the like are determined by observing a cross section extending in the longitudinal direction X through the top portion t of the sloped convex portion 41. When the inclined convex portion 41 is formed of a sheet material (first sheet) joined to another sheet or the like such as the second sheet 2, the observation is made by the first sheet 1 and the second sheet 2. The composite sheet 10 having the joint portion 3 is removed from the absorbent article, and a cross section extending through the top portion t of the inclined convex portion 41 and extending in the longitudinal direction X is observed and judged.

In order to manufacture the composite sheet 10 which has the uneven | corrugated area | region P in which the inclined convex part 41 was formed, it carries out similarly to the method of Unexamined-Japanese-Patent No. 2015-112343, and the belt-shaped 1st sheet 1 is carried out. After the first sheet 1 is deformed into a concavo-convex shape by being supplied between the first roll and the second roll in the meshing shape, the first sheet 1 is held on the circumferential surface portion of the first roll After being moved from the meshing portion, the second sheet 2 is supplied so as to be superimposed on the first sheet 1, and both sheets 1 and 2 are pinched under heat between the convex portion of the first roll and the heat roll. Partially bond.
Next, the obtained composite sheet is pressurized by a first nip roll, and at that time, the composite sheet is pressed while being strongly pulled downstream by a second nip roll or the like disposed downstream of the first nip roll. Thereby, the convex part formed in the composite sheet inclines toward the upstream side, and the composite sheet 10 which has the uneven | corrugated area | region P in which the inclined convex part 41 was formed is obtained. From the viewpoint of forming the inclined convex portion 41, the peripheral speed of the second nip roll is preferably higher than the peripheral speed of the first nip roll, and preferably not less than 1.05 times the peripheral speed of the first nip roll. More preferably, it is 1.1 times or more. In addition, the first nip roll heats at least the roll contacting the first sheet 1 to a temperature less than the melting point of main constituent fibers of the first sheet 1, for example, a temperature lower than the melting point by 50 ° C. and less than the melting point Is preferred.

In addition, in order to form a consolidated portion (bonded portion 3) having different densities at both ends in the longitudinal direction X, as a first roll, the height from the base surface to the tip end face of the roll is continuous in the circumferential direction of the roll or Between the first roll and the heat roll, one having the non-continuously changing convex portion is pressed to form the joint portion 3 such as the first joint portion 31 or the second joint portion 32 described above. Just do it.

As shown in FIG. 3, the composite sheet 10 used in the disposable diaper 100 according to the first embodiment has a central area M as the uneven area P and side areas S and S located on both sides of the central area M. In the side regions S and S, the non-inclined convex portion 43 in which the position of the top t is at the central position 43c between both ends of the convex portion is formed. In order to produce the composite sheet 10 having such a configuration, the concavo-convex shape of the first roll and the second roll and the pattern of the joint formed by the first roll and the heat roll in the central portion and the side portions of the first sheet. And the processing by the first nip roll described above may be applied only to the central portion of the obtained composite sheet.

Next, a second embodiment of the absorbent article of the present invention will be described with reference to FIG. About the diaper which concerns on 2nd Embodiment, a different point from the diaper which concerns on 1st Embodiment is demonstrated. About the point which is not explained in particular, it is the same as that of the diaper concerning a 1st embodiment, and explanation of the diaper is applied suitably.

Fig.8 (a) is a figure which shows a part of uneven | corrugated area | region of the surface sheet 12 which concerns on 2nd Embodiment. The surface sheet in the second embodiment is composed of a composite sheet, and has a concavo-convex area formed in a state where the inclined convex portions 41 d are dispersed in the longitudinal direction X and the width direction Y in a predetermined pattern. In the composite sheet in the second embodiment, the pattern shown in FIG. 8A is formed uniformly in the inclined convex portions 41 d, and the central region M and the side regions S are included as in the first embodiment described above. I did not.
The composite sheet in the second embodiment has a concavo-convex area over the entire area. Moreover, the uneven | corrugated area | region is formed with the inclined convex part 41d of the planar view shape different from the composite sheet 10 in 1st Embodiment. As shown in FIG. 8B, the inclined convex portion 41d in the concavo-convex area has a horizontally long plan view shape in which the length L5 in the width direction Y of the absorbent article is longer than the length L7 in the longitudinal direction X At the central portion of the direction Y, there is a constricted portion 45 whose length in the longitudinal direction X is shorter than the portions located on both sides thereof. The length L5 of the inclined projection 41d in the width direction Y is the maximum length of the inclined projection 41d in the width direction Y, and the length L7 in the longitudinal direction X is the maximum length of the inclined projection 41d in the width direction Y It is. The composite sheet in which such an inclined convex portion 41d is formed can capture excrement U in the constricted portion 45 of the inclined convex portion 41d, and the rising portion g (see FIG. 5) of the inclined convex portion 41d is inclined. It is further excellent by the diffusion control effect of the excrement U with the diffusion suppression effect of the excrement U by doing.

From the viewpoint of effectively capturing the excrement U, the inclined convex portion 41d has a length L5 in the width direction Y (see FIG. 8B) and a length L6 in the longitudinal direction X in the constricted portion 45 [FIG. b), preferably 1.5 times or more, more preferably 2.0 times or more, and preferably 8.0 times or less, more preferably 6.0 times or less, and preferably 1 .5 times or more and 8.0 times or less, more preferably 2.0 times or more and 6.0 times or less.

As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to each embodiment mentioned above, It can change suitably.
For example, the composite sheet 10 used for the surface sheet 12 may not have the side regions S and S in which the convex portions are formed in a pattern different from the central region M, and the central region M and the entire region A composite sheet 10 having a similar configuration may be used as the top sheet 12.
Further, in the first embodiment described above, as shown in FIG. 3, the concavo-convex area P having the sloped convex portion 41 is formed to extend over the entire length in the longitudinal direction of the diaper 100. In the elastic article, the concavo-convex area P having the inclined convex portion 41 may be formed only in any part in the longitudinal direction of the absorbent article, for example, only the abdominal side A, only the dorsal side B, Alternatively, it may be formed only in the crotch portion C, or may be formed only in the crotch portion C and the ventral side portion A or only in the crotch portion C and the back side portion B.

The absorbent article of the present invention may have a region in which a plurality of inclined convex portions in which the position of the top t is biased to the same side in the longitudinal direction X are formed in the uneven region. Such an area is also referred to as the same inclined area. For example, in the case where the dorsal side B has a region in which a plurality of forward inclined convex portions are formed, the region is the same inclined region.

In the same inclination region, it is preferable that the average deviation MMD ₁ of the friction coefficient in the inclination direction of the plurality of inclination convex portions is different from the average deviation MMD ₂ of the friction coefficient in the opposite direction to the inclination direction. More preferably, the mean deviation MMD ₁ of the friction coefficient in the inclining direction is larger than the mean deviation MMD ₂ of the friction coefficient in the direction opposite to the inclining direction. With such a configuration, it is possible to reduce the frictional force when the skin comes into contact along the inclined direction in the same inclined region, while increasing the frictional force when the skin comes into contact along the opposite direction. It is possible to control the moving direction of the top sheet by the contact of In order to describe the above-mentioned effect in detail, the case where it has an identical inclined area in which a plurality of forward inclined convex portions are formed on the back side B and an identical inclined area in which a plurality of backward inclined convex parts are formed on the abdominal side A Explain to. In this example, the skin 7 and the inclined convex portions 41 contact with each other along the inclination direction of the front inclined convex portion and the rear inclined convex portion when putting on the diaper [see FIG. 9 (a)]. It is possible to suppress the friction force (resistance) between the and the inclined convex portion, and the work of putting on the diaper can be easily performed. Further, in the wearing state, that is, in the contact state between the skin 7 and the inclined convex portion, when a force is applied in the direction opposite to the inclined direction of the inclined convex portion, the inclined convex portion is deformed to increase the frictional force [ See FIG. 9 (b)]]. Thereby, the shift | offset | difference of the diaper of a wearing condition is suppressed effectively, and the leak of the above-mentioned excrement is suppressed more.

The friction in the inclination direction of the plurality of inclined projections in the same inclination region is the friction generated when moving on the plurality of inclined projections toward the side where the positions of the top portions t of the plurality of inclined projections are biased. The friction in the direction opposite to the inclined direction is a friction that occurs when moving toward the side opposite to the biasing side. The friction in the inclined direction in the same inclined region of the back side B in the above example is the friction generated along the inclination direction of the front inclined convex portion, and when moving from the back side B to the crotch C side The friction in the opposite direction is the friction that occurs when moving from the crotch C side to the back side B side. In addition, the friction in the inclination direction in the same inclination region of the abdominal side A in the above example is the friction generated along the inclination direction of the rear inclined convex portion, and moves from the abdominal side A to the crotch C side The friction in the opposite direction is the friction that occurs when moving from the crotch C side to the belly side A side. The mean deviation of the coefficient of friction MMD indicates the degree of variation of the coefficient of friction that occurs when moving along the inclined direction or the opposite direction in the following measurement method.

[Method of measuring average deviation MMD of friction coefficient in inclination direction and in opposite direction in the same inclination region]
The average deviation MMD of the coefficient of friction is measured using KESFB4-AUTO-A (trade name) manufactured by Kato Tech Co., Ltd. according to the method described in the following book.
Kawabata Akio, "Standardization and Analysis of Texture Evaluation", 2nd Edition, Japan Textile Opportunity Society, Japan Committee on Texture Measurement and Standardization, published on July 10, 1959 First, from the same inclined area of the surface sheet, A test piece with a length of 20 cm in the longitudinal direction and a length of 10 cm in the width direction is cut out and mounted on a smooth metal flat test stand with the skin contact surface up. While pressing the contact surface of the contact to the skin contact surface of the test piece with a force of 49 cN, the test piece is reciprocated by 2 cm along the longitudinal direction of the diaper at a constant speed of 0.1 cm / sec. Measure the friction coefficient in each direction and in the opposite direction. The outward path and the return path of this reciprocating movement are the movement in the inclination direction of the inclined convex portion and the movement in the opposite direction of the inclination direction. During reciprocation, the specimen is subjected to a uniaxial tension of 19.6 cN / cm. The contactor is formed by arranging 20 piano wires of 0.5 mm diameter and bending it into a U shape with a width of 10 mm, and the contact surface is crimped to the test piece with a force of 49 cN by a weight. By this measurement, the average deviation MMD of the friction coefficient in each of the inclination direction and the opposite direction of the inclined convex portion in the same inclination region is determined. The measurement is repeated three times, and the average deviation MMD of the friction coefficient is determined as the average value in each of the inclination direction and the opposite direction, and this is used as the average deviation MMD ₁ of the friction coefficient in the inclination direction and the average deviation MMD ₂ of the friction coefficient in the opposite direction. I assume.

The average deviation MMD _{1 of the} coefficient of friction in the inclined direction is the average deviation MMD _{2 of the} coefficient of friction in the opposite direction, from the viewpoint of making the task of putting on the diaper easier and suppressing the displacement of the diaper in the wearing condition more effectively. The difference between the average deviation MMD ₁ of the friction coefficient in the inclination direction in the same inclination region and the average deviation MMD ₂ of the friction coefficient in the opposite direction is preferably 0, on the assumption that it is smaller than (MMD ₂ > MMD ₁ ) .001 or more, more preferably 0.002 or more, preferably 0.02 or less, more preferably 0.01 or less, and preferably 0.001 or more and 0.02 or less, more preferably 0.002 It is more than 0.01 or less.

The top sheet 12 preferably has the same sloped area at least at the dorsal side B, more preferably at each of the dorsal side B and the ventral side A, and has a coefficient of friction in the inclined direction and the opposite direction in the same sloped area. The mean deviation MMD satisfies the above-mentioned magnitude relationship (MMD ₂ > MMD ₁ ). When only the dorsal side B has the same inclination region and satisfies the above-mentioned magnitude relationship (MMD ₂ > MMD ₁ ), the difference between the mean deviation MMD of the friction coefficient in the inclination direction and the opposite direction in the abdominal side A It is preferable that there is no

In addition, in the uneven region P, the inclined convex portion and the non-inclined convex portion may coexist. As an aspect of coexistence, it may be mixed. A mixed aspect is mentioned. However, in the concavo-convex area, at least one part where two or more inclined convex parts (front inclined convex parts or rear inclined convex parts) in which the positions of the top parts are deviated in the same direction are arranged along the longitudinal direction X Preferably, a plurality is formed. Further, a convex portion row in which a plurality of forward inclined convex portions or rear inclined convex portions are arranged in the longitudinal direction X and a convex portion row in which a plurality of non-inclined convex portions are arranged in the longitudinal direction X may be formed They may be alternately formed in the width direction Y of the absorbent article, or may be formed in an appropriate order.

The number of inclined convex portions in the concavo-convex area P is preferably 30% or more, more preferably 50% or more, preferably 100% or less, with respect to the number of all the convex parts in the concavo-convex area P. Is 90% or less, preferably 30% to 100%, and more preferably 50% to 90%.
The ratio of the number of inclined convex portions to the number of all the convex portions in the uneven region P, that is, the ratio of the inclined convex portions is an average value of the ratio of the inclined convex portions in five or more measurement pieces. The ratio of the inclined convex portions in the measurement piece is as follows: after cutting out at least five measurement pieces of 50 mm × 50 mm from the concavo-convex area P and determining the number of all the convex portions present in the measurement piece, pass through the top of each convex portion Further, the number of inclined convex portions is determined by observing a cross section extending in the longitudinal direction X, and the number of inclined convex portions is divided by the number of all the convex portions present in the measurement piece.

In the concavo-convex region P, the width direction convex portion row in which the plurality of convex portions 4 are arranged along the width direction Y may be constituted only by the inclined convex portions, and the inclined convex portions and the non-inclined convex portions It may be included. In addition, the concavo-convex region P may have a width direction convex portion array in which the ratio of the number of inclined convex portions is different.
From the viewpoint of suppressing the diffusion of stool in the longitudinal direction X, the concavo-convex region P is a high ratio inclination in which the number of inclined convex portions is half or more among the convex portions constituting the width direction convex portion row as the width direction convex portion row. It is preferable to include a convex portion row. In the high proportion inclined convex portion row, the proportion of the inclined convex portions is half or more, preferably more than half, more preferably 60% or more, further preferably 80% or more, and still more preferably 100%. From the viewpoint of further suppressing the diffusion of feces, the uneven region P preferably includes a plurality of high ratio inclined convex portion rows. As an embodiment including a plurality of high ratio inclined convex part rows, the whole area of the concavo-convex region P is a high ratio inclined convex part line, or the high ratio inclined convex part row and the non-high ratio inclined convex part row are longitudinal directions X The thing of the arbitrary patterns arranged alternately to is mentioned. As the width direction convex portion row, the non-high ratio inclined convex portion row includes a low ratio inclined convex portion row having a small ratio of inclined convex portions and a non-inclined convex portion row formed only of non-inclined convex portions. As an arbitrary pattern, for example, a pattern in which two non-high ratio inclined convex portion rows and one high ratio inclined convex portion row are alternately arranged along the longitudinal direction X can be mentioned. In addition, when the high proportion inclined convex part line has the inclined convex part and the non-inclined convex part, the high proportion inclined convex part line is an inclined convex part small line in which a plurality of inclined convex parts are continuously arranged in the width direction Y It is preferable that non-inclined convex portions are alternately arranged in the width direction Y.
As shown in FIG. 1, when the top sheet has a central area M and side areas S and S, and the pattern of forming the convex portion is different between the central area M and the side areas S and S, the inclination in the uneven area P is The ratio of the convex portions, the ratio of the inclined convex portions in the width direction convex portion row, and the like are measured for the central region M.

Further, the shapes of the bonding portion 3 and other bonding portions surrounding the inclined convex portion 41 and the arrangement thereof can be determined as appropriate. The shape of each joint may be any shape such as a circle, an ellipse, an oval, a triangle, a quadrangle, a pentagon, a star, a heart, etc., in addition to a rectangle and a square.
Further, the absorbent article of the present invention may be a pant-type (pull-on type) disposable diaper in place of the unfolded disposable diaper, and may be a pant-type or ordinary non-pant type sanitary napkin It may be an incontinence pad, a panty liner or the like.

Regarding the above-mentioned embodiment, the present invention further discloses the following absorbent article.
<1>
An absorbent article comprising a top sheet having a concavo-convex area, a back sheet, and an absorber disposed between the two sheets, and having a longitudinal direction corresponding to the front-rear direction of the wearer and a width direction orthogonal to the longitudinal direction. ,
A plurality of inclined protrusions are formed in the uneven region,
The inclined convex portion protrudes toward the skin side of the wearer, and the position of the top portion is biased to one side in the longitudinal direction from the central position between the longitudinal ends of the inclined convex portion. Goods.

<2>
The absorbent article according to <1>, wherein the one side rising portion where the position of the top portion of the inclined convex portion is deviated is inclined to the one side with respect to the vertical.
<3>
The absorbent article according to <1> or <2>, wherein the inclined convex portion has an overhang portion on one side where the position of the top portion is biased.
<4>
The inclined convex portion does not exceed the position of the end of the other inclined convex portion adjacent to the one side adjacent to the one side where the position of the apex is biased. The absorbent article according to any one of 1> to <3>.
<5>
The rising portion of the inclined convex portion 41 is less than 90 °, preferably 30 ° or more and less than 80 °, assuming that the inclination angle with respect to a plane extending in parallel with the surface sheet is 90 °. The absorbent article according to any one of <1> to <4>, which is more preferably 45 ° or more and 60 ° or less.
<6>
When the length between both ends in the longitudinal direction of the inclined convex portion 41 is 100%, the position of the top of the inclined convex portion is outside the distance range within 5% of the front and rear from the central position, and the center The absorbent article according to any one of the above <1> to <5>, which is preferably outside the distance range of 10% or less from the position.
<7>
The absorbent article according to any one of <1> to <6>, wherein the inclined convex portion has a horizontally long plan view shape in which the length in the width direction is longer than the length in the longitudinal direction.
<8>
In the inclined convex portion, the length L1 in the width direction is 1.1 times or more, preferably 1.5 times or more, preferably 6.0 times or less, preferably 4. times the length L2 in the longitudinal direction. The absorbent according to any one of the above <1> to <7>, which is 0 times or less and 1.1 times or more and 6.0 times or less, preferably 1.5 times or more and 4.0 times or less Goods.
<9>
The length L1 in the width direction of the inclined convex portion is 3 mm or more, preferably 5 mm or more, 100 mm or less, preferably 75 mm or less, and 3 mm or more and 100 mm or less, preferably 5 mm or more and 75 mm or less. The absorbent article according to any one of the above <1> to <8>.
<10>
The height H1 of the inclined convex portion is 1.0 mm or more, more preferably 2.0 mm or more, and 5.0 mm or less, more preferably 4.0 mm or less, and 1.0 mm or more and 5.0 mm or less The absorbent article according to any one of <1> to <9>, more preferably 2.0 mm or more and 4.0 mm or less.

<11>
In addition to the inclined convex portion, the uneven region has a non-inclined convex portion,
The non-inclined convex portion protrudes toward the skin side of the wearer, and the position of the top is located at a central position between both ends of the non-inclined convex portion in the longitudinal direction. The absorbent article according to 1.
<12>
The number of the inclined protrusions in the uneven region is 30% or more, preferably 50% or more, and 100% or less, preferably 90% or less, with respect to the number of all the convex portions in the uneven region. The absorbent article according to any one of <1> to <11>, which is 30% or more and 100% or less, more preferably 50% or more and 90% or less.
<13>
The top sheet is a front sloped convex portion in which the position of the top portion is biased to the front side relative to the center position between the both ends as the sloped convex portion over the whole or the entire central region located at the center in the width direction. The absorbent article according to any one of <1> to <12>, wherein only one of the rear inclined convex portions is formed such that the position of the top portion is offset to the rear side from the central position.
<14>
The uneven region has a convex portion row in which a plurality of inclined convex portions whose positions of the apexes are deviated to the same side in the longitudinal direction are arranged along the longitudinal direction, and between the inclined convex portions in the convex portion row The absorbent article according to any one of the above <1> to <13>, which has a recess having a consolidation part.
<15>
In the uneven area, the stacked first and second sheets are joined to each other at a plurality of joining portions, and the first sheet protrudes in a direction away from the second sheet at a portion other than the joining portions. The absorbent article according to any one of <1> to <14>, which forms the inclined convex portion.
<16>
The surface according to <15>, wherein the surface on the side of the second sheet is substantially flat, and on the side of the first sheet, large concaves and convexes of unevenness are formed by the concave portion between the inclined convex portion and the inclined convex portion. Absorbent article.
<17>
The surface sheet is formed into the concavo-convex area as a compacting portion, and the first bonding portion in which the first sheet and the second sheet are fused by embossing as well as the first bonding portion by embossing. And a second joint portion welded between the sheet 1 and the second sheet,
In the concavo-convex region, a plurality of width direction convex portion rows in which a plurality of the inclined convex portions are connected in series along the width direction at constant intervals are formed in a plurality of rows in the longitudinal direction, and a plurality of the inclined convex portions A plurality of convex portion rows are formed in the width direction, the convex portion rows being arranged in series along the longitudinal direction at regular intervals,
The first joint between the inclined convex portions adjacent in the longitudinal direction in the convex portion row is located between the inclined convex portions adjacent in the width direction in the width direction convex portion row,
The <15> or <16>, wherein the first joint between the inclined convex portions adjacent in the width direction is located between the inclined convex portions in the convex portion row adjacent in the width direction. The absorbent article as described.
<18>
In the first joint portion, the length b in the longitudinal direction is 1.2 times or more, preferably 1.5 times or more, preferably 5.0 times or less, preferably 3.times. The absorbent article as described in said <17> which is 0 times or less, and is 1.2 times or more and 5.0 times or less, preferably 1.5 times or more and 3.0 times or less.
<19>
Each of the inclined convex portions is surrounded by the first joint and the second joint whose length in the longitudinal direction is shorter than that of the first joint. The absorbent article as described in>.
<20>
The length d of the longitudinal direction X of the second bonding portion is 20% to 85%, preferably 30% to 70%, of the length b of the first bonding portion in the longitudinal direction. The absorbent article according to any one of the above <17> to <19>.
<21>
In the second bonding portion, the length c in the width direction is 0.8 or more and 1.2 or less, preferably 0.9 or more of the length a in the width direction of the first bonding portion. The absorbent article according to any one of the above <17> to <20>, which is 1 or less.

<22>
The consolidation unit according to any one of <17> to <21>, wherein the density on the side opposite to the one side is higher than the density on the one side where the position of the top portion is deviated. Absorbent article.
<23>
The concavo-convex area has a width direction convex portion row in which a plurality of convex portions are arranged along the width direction, and the inclined convex of the convex portions constituting the width direction convex portion row as the width direction convex portion row The absorbent article according to any one of the above <1> to <22>, which comprises a high proportion inclined convex part row having a half or more part.
<24>
The absorbent article according to <23>, wherein in the width direction convex portion row, the ratio of inclined convex portions is more than half, preferably 60% or more, more preferably 80% or more, and still more preferably 100%. .
<25>
The absorbent article according to <23> or <24>, wherein the concavo-convex area includes a plurality of rows of the high proportion inclined convex portion row.
<26>
The uneven region is, as the width direction convex portion row, in addition to the high ratio inclined convex portion row, a low ratio inclined convex portion row having a small ratio of the inclined convex portion, or a non-inclined convex consisting only of non-inclined convex portions The <23> to <25, having a non-high ratio inclined convex portion row which is a partial row, wherein the high ratio inclined convex portion row and the non-high ratio inclined convex portion row are alternately arranged in the longitudinal direction. The absorbent article as described in any one of>.
<27>
The absorbent article is divided into three equal longitudinal lengths, and a dorsal side disposed on the rear side of the wearer, a ventral side disposed on the front side of the wearer, and a crotch positioned between them. <1> to <26>, wherein a front inclined convex portion is formed as the inclined convex portion on the back side when the front portion is divided into two, wherein the position of the apex is biased to the front side from the central position between the both ends The absorbent article according to any one of the above.
<28>
The absorbent article is divided into three equal longitudinal lengths, and a dorsal side disposed on the rear side of the wearer, a ventral side disposed on the front side of the wearer, and a crotch positioned between them. <1> to <27 as the inclined convex portion, a rear inclined convex portion in which the position of the apex is deviated to the rear side from the central position between the both ends is formed on the belly side when divided into The absorbent article as described in any one of>.
<29>
In the uneven region, the inclined convex portions are formed in a state of being dispersed in the longitudinal direction and the width direction, and are arranged in a zigzag shape according to any one of <1> to <28>. Absorbent article.

<30>
The uneven region has the same inclined region in which a plurality of inclined convex portions are formed in which the position of the top portion is deviated to the same side in the longitudinal direction, and in the same inclined region, the plurality of inclined convex portions The absorbent article according to any one of <1> to <29>, wherein the mean deviation MMD ₁ of the friction coefficient in the inclining direction and the mean deviation MMD ₂ of the friction coefficient in the opposite direction to the inclining direction are different.
<31>
The uneven region has the same inclined region in which a plurality of inclined convex portions are formed in which the position of the top portion is deviated to the same side in the longitudinal direction, and in the same inclined region, the plurality of inclined convex portions The absorbent article according to any one of <1> to <30>, wherein the mean deviation MMD ₁ of the friction coefficient in the inclining direction is smaller than the mean deviation MMD ₂ of the friction coefficient in the opposite direction to the inclining direction.
<32>
<30> or <31, wherein the difference between the average deviation MMD ₁ of the friction coefficient in the inclination direction and the average deviation MMD ₂ of the friction coefficient in the opposite direction in the same inclination region is 0.001 or more and 0.02 or less The absorbent article as described in>.
<33>
<30> or <31, wherein the difference between the average deviation MMD ₁ of the friction coefficient in the inclination direction and the average deviation MMD ₂ of the friction coefficient in the opposite direction in the same inclination region is 0.002 or more and 0.01 or less, The absorbent article as described in>.

According to the absorbent article of the present invention, it is easy to control the movement of the excrement, and by suppressing or controlling the diffusion of the excrement, it is possible to effectively enhance the leakage prevention property etc. of the excrement, and the inclination By the deformation of the convex portion or the like, it is possible to effectively make the excrement remaining between the convex portions difficult to adhere to the skin of the wearer.

Claims (33)

An absorbent article comprising a top sheet having a concavo-convex area, a back sheet, and an absorber disposed between the two sheets, and having a longitudinal direction corresponding to the front-rear direction of the wearer and a width direction orthogonal to the longitudinal direction. ,
A plurality of inclined protrusions are formed in the uneven region,
The inclined convex portion protrudes toward the skin side of the wearer, and the position of the top portion is biased to one side in the longitudinal direction from the central position between the longitudinal ends of the inclined convex portion. Goods. 2. The absorbent article according to claim 1, wherein the one side rising portion from which the position of the top portion is deviated is inclined such that the inclined convex portion is inclined to the one side from the vertical. The absorbent article according to claim 1, wherein the inclined convex portion has an overhang portion on one side where the position of the top portion is biased. The said inclined convex part does not exceed the position of the end on the opposite side to the said one side in the other inclined convex part adjacent to the said one side where the position of the said top part biases the position of the said top part. The absorbent article according to any one of 1 to 3. The rising portion of the inclined convex portion is 30 ° or more and less than 80 °, where the inclination angle with respect to a plane extending parallel to the surface of the surface sheet is 90 ° when vertical. The absorbent article according to item 1. The position of the top of the inclined convex portion is out of the range of 5% or less from the central position forward and backward from the central position when the length between both ends in the longitudinal direction of the inclined convex portion is 100%, the central position The absorbent article according to any one of claims 1 to 5, which is out of the range of distance within 10% of back and forth. The absorbent article according to any one of claims 1 to 6, wherein the inclined convex portion has a horizontally long plan view shape in which the length in the width direction is longer than the length in the longitudinal direction. The absorbability according to any one of claims 1 to 7, wherein the inclined convex portion has a length L1 in the width direction of 1.1 times or more and 6.0 times or less of a length L2 in the longitudinal direction. Goods. The absorbent article according to any one of claims 1 to 8, wherein the length L1 in the width direction of the inclined convex portion is 3 mm or more and 100 mm or less. The absorbent article according to any one of claims 1 to 9, wherein the height H1 of the inclined convex portion is 1.0 mm or more and 5.0 mm or less. In addition to the inclined convex portion, the uneven region has a non-inclined convex portion,
The non-inclined convex portion protrudes toward the skin side of the wearer, and the position of the top portion is at a central position between both ends of the non-inclined convex portion in the longitudinal direction. The absorbent article as described. The number of the said inclined convex part in the said uneven | corrugated area | region is 30% or more and 100% or less with respect to the number of objects of all the convex parts in this uneven | corrugated area | region, The absorbent article in any one of Claims 1-11 . The top sheet is a front sloped convex portion in which the position of the top portion is biased to the front side relative to the center position between the both ends as the sloped convex portion over the whole or the entire central region located at the center in the width direction. The absorbent article according to any one of claims 1 to 12, wherein only one of the rear sloped convex portions is formed such that the position of the top portion is shifted to the rear side from the central position. The uneven region has a convex portion row in which a plurality of inclined convex portions whose positions of the apexes are deviated to the same side in the longitudinal direction are arranged along the longitudinal direction, and between the inclined convex portions in the convex portion row The absorbent article according to any one of claims 1 to 13, further comprising a recess having a consolidation part. In the uneven area, the stacked first and second sheets are joined to each other at a plurality of joining portions, and the first sheet protrudes in a direction away from the second sheet at a portion other than the joining portions. The absorbent article according to any one of claims 1 to 14, wherein the inclined convex portion is formed. The absorption according to claim 15, wherein the surface on the side of the second sheet is substantially flat, and on the side of the first sheet, large concaves and convexes of unevenness are formed by the concave portion between the sloped convex portion and the sloped convex portion. Sex goods. The surface sheet is formed into the concavo-convex area as a compacting portion, and the first bonding portion in which the first sheet and the second sheet are fused by embossing as well as the first bonding portion by embossing. And a second joint portion welded between the sheet and the second sheet,
In the concavo-convex region, a plurality of width direction convex portion rows in which a plurality of the inclined convex portions are connected in series along the width direction at constant intervals are formed in a plurality of rows in the longitudinal direction, and a plurality of the inclined convex portions A plurality of convex portion rows are formed in the width direction, the convex portion rows being arranged in series along the longitudinal direction at regular intervals,
The first joint between the inclined convex portions adjacent in the longitudinal direction in the convex portion row is located between the inclined convex portions adjacent in the width direction in the width direction convex portion row,
The absorption according to claim 15 or 16, wherein the first joint between the inclined convex portions adjacent in the width direction is located between the inclined convex portions in the convex portion row adjacent in the width direction. Sex goods. The absorbent article according to claim 17, wherein the length b in the longitudinal direction of the first bonding portion is not less than 1.2 times and not more than 5.0 times the length in the width direction. 19. The device according to claim 17, wherein each of the inclined convex portions is surrounded by the first joint and the second joint whose length in the longitudinal direction is shorter than that of the first joint. Absorbent articles. The length d in the longitudinal direction of the second bonding portion is 20% or more and 85% or less of the length b in the longitudinal direction of the first bonding portion. The absorbent article as described. The length c in the width direction of the second bonding portion is 0.8 or more and 1.2 or less of the length a in the width direction of the first bonding portion. The absorbent article as described in a term. 22. The absorbent according to any one of claims 17 to 21, wherein the consolidation portion has a higher density on the side opposite to the one side than the density on the one side where the position of the top portion is deviated. Goods. The concavo-convex area has a width direction convex portion row in which a plurality of convex portions are arranged along the width direction, and the inclined convex of the convex portions constituting the width direction convex portion row as the width direction convex portion row The absorbent article according to any one of claims 1 to 22, comprising a high proportion inclined convex portion row having a half or more part. The absorbent article according to claim 23, wherein in the width direction convex portion row, the ratio of inclined convex portions is more than half. The absorbent article according to claim 23 or 24, wherein the uneven region includes a plurality of rows of high proportion inclined convex portion rows. The uneven region is, as the width direction convex portion row, in addition to the high ratio inclined convex portion row, a low ratio inclined convex portion row having a small ratio of the inclined convex portion, or a non-inclined convex consisting only of non-inclined convex portions The method according to any one of claims 23 to 25, further comprising a non-high ratio inclined convex portion row which is a partial row, wherein the high ratio inclined convex portion row and the non-high ratio inclined convex portion row are alternately arranged in the longitudinal direction. An absorbent article according to any one of the preceding claims. The absorbent article is divided into three equal longitudinal lengths, and a dorsal side disposed on the rear side of the wearer, a ventral side disposed on the front side of the wearer, and a crotch positioned between them. The front inclined convex part in which the position of the top is biased to the front side from the central position between the both ends is formed as the inclined convex part on the back side when it is divided into The absorbent article according to item 1. The absorbent article is divided into three equal longitudinal lengths, and a dorsal side disposed on the rear side of the wearer, a ventral side disposed on the front side of the wearer, and a crotch positioned between them. 28. The apparatus according to any one of claims 1 to 27, wherein a rear inclined convex portion is formed as the inclined convex portion on the ventral side when divided into two, wherein the position of the apex is biased to the rear side from the central position between the both ends. An absorbent article according to any one of the preceding claims. The absorption according to any one of claims 1 to 28, wherein the inclined convex portions are disposed in a zigzag shape in a state of being dispersed in the longitudinal direction and the width direction in the uneven region. Sex goods. The uneven region has the same inclined region in which a plurality of inclined convex portions are formed in which the position of the top portion is deviated to the same side in the longitudinal direction, and in the same inclined region, the plurality of inclined convex portions The absorbent article according to any one of claims 1 to 29, wherein the mean deviation MMD _{1 of the} coefficient of friction in the inclining direction and the mean deviation MMD _{2 of the} coefficient of friction in the opposite direction to the inclining direction are different. The uneven region has the same inclined region in which a plurality of inclined convex portions are formed in which the position of the top portion is deviated to the same side in the longitudinal direction, and in the same inclined region, the plurality of inclined convex portions The absorbent article according to any one of claims 1 to 30, wherein the mean deviation MMD _{1 of the} coefficient of friction in the inclining direction is smaller than the mean deviation MMD _{2 of the} coefficient of friction in the opposite direction to said inclining direction. 32. The method according to claim 30, wherein a difference between an average deviation MMD ₁ of the friction coefficient in the inclination direction and an average deviation MMD ₂ of the friction coefficient in the opposite direction in the same inclination region is 0.001 or more and 0.02 or less. Absorbent articles. 32. The method according to claim 30, wherein a difference between an average deviation MMD ₁ of the friction coefficient in the inclination direction and an average deviation MMD ₂ of the friction coefficient in the opposite direction in the same inclination region is 0.002 or more and 0.01 or less. Absorbent articles.

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