WO2021149694A1

WO2021149694A1 - Absorbent article

Info

Publication number: WO2021149694A1
Application number: PCT/JP2021/001746
Authority: WO
Inventors: 瓊呉; 亮太蔵前
Original assignee: 花王株式会社
Priority date: 2020-01-23
Filing date: 2021-01-20
Publication date: 2021-07-29
Also published as: CN114945349B; JP2021115180A; CN114945349A; JP7405628B2

Abstract

In the present invention, an absorbent (5) has: a pair of raised portions (50) at an inseam (B) that are positioned on both sides across the center section in a lateral direction (Y) of the absorbent (5) and that, when worn, rise toward the skin of the wearer; and a non-raised portion (51) positioned in said center section. A surface sheet (3) crosses the skin-facing side of the raised portions (50) and the non-raised portion (51) in the lateral direction (Y), and a section (3E) of the surface sheet (3) is wrapped around the non-skin-facing side of the absorbent (5). Uneven regions (30A, 30B) that include a plurality of convex sections (31) and concave sections (32) are formed in areas covering the skin-facing surfaces of the raised portions (50) and the non-raised portion (51) of the surface sheet (3). The convex sections (31) include a plurality of types of convex sections (31A, 31B) which have mutually different protrusion heights and surface areas. Small convex sections (31A) are arranged in the uneven regions (30A) of the raised portions (50), and large convex sections (31B) are arranged in the uneven region (30B) of the non-raised portion (51).

Description

Absorbent article

The present invention relates to absorbent articles such as disposable diapers.

The absorbent article is typically composed of an absorbent body mainly composed of a water-absorbent material such as pulp or a water-absorbent polymer, and a surface sheet arranged on the skin-facing surface side of the absorbent body. .. In Patent Document 1, as a pants-type disposable diaper having such a configuration, a pair of leak-proof cuffs are provided, and the side portions of the absorber are raised in the vicinity of both side edges along the longitudinal direction of the absorber. The side elastic members of the above are arranged, and the pair of leak-proof cuffs and the side portion of the absorber are described so as to stand up toward the wearer's skin side when worn. Further, the surface sheet included in the pants-type disposable diaper described in Patent Document 1 is an uneven surface sheet in which an uneven region is formed in a portion covering the skin-facing surface of the absorber.

Patent Document 2 describes an absorbent article provided with a concavo-convex surface sheet, wherein the concavo-convex surface sheet is composed of a composite sheet in which two sheets are partially joined. This composite sheet (concavo-convex surface sheet) has a plurality of joints between the two sheets and a plurality of convex portions protruding toward the skin side of the wearer, and has a central region in the width direction of the article and the central region. The pattern of the convex portion is different from that of the side regions located on both sides of the above. According to the absorbent article described in Patent Document 2, the boundary between the central region and the side region is likely to be bent, and the absorbent article is easily deformed into a boat shape when worn, so that excellent leakage prevention performance can be obtained. It is said that it will be done.

Japanese Unexamined Patent Publication No. 2016-22282 Japanese Unexamined Patent Publication No. 2016-209535

The present invention has a vertical direction extending from the ventral side of the wearer to the dorsal side via the crotch portion and a lateral direction orthogonal to the vertical direction, and the crotch portion arranged in the crotch portion and the crotch portion. An absorber that is divided into a ventral portion arranged on the ventral side of the wearer and a dorsal portion arranged on the dorsal side of the wearer rather than the crotch portion, and extends in the vertical direction through the crotch portion. And an absorbent article comprising a surface sheet arranged on the skin-facing surface side of the absorber.
In one embodiment of the absorbent article of the present invention, the absorber is located on both sides of the absorber, at least in the inseam, with the lateral central portion of the absorber in between, and faces the wearer's skin side when worn. It has a pair of standing portions that stand upright and a non-standing portion located in the central portion.
In one embodiment of the absorbent article of the present invention, the surface sheet traverses the skin-facing surface side of the pair of upright portions and the non-upright portion in the lateral direction, and the pair of upright portions in the surface sheet. The extending portion from the above is wrapped around the non-skin facing surface side of the absorber.
In one embodiment of the absorbent article of the present invention, a plurality of convex portions projecting toward the skin side of the wearer are formed on a portion of the surface sheet that covers the skin-facing surface of the pair of upright portions and the non-upright portion. An uneven region including a concave portion located around the convex portion is formed.
In one embodiment of the absorbent article of the present invention, the convex portion includes a plurality of types of convex portions having different protrusion heights or areas, and the concave-convex region of the upright portion is compared with the concave-convex region of the non-upright portion. Therefore, the protruding height or area of the convex portion is small.
Other features, effects and embodiments of the present invention are described below.

FIG. 1 is a perspective view schematically showing a natural state of a pants-type disposable diaper, which is an embodiment of an absorbent article of the present invention. FIG. 2 is a developed plan view schematically showing the skin-facing surface side (surface sheet side) in the unfolded and stretched state of the diaper shown in FIG. FIG. 3 is a cross-sectional view schematically showing a cross section along the vertical center line CLx of FIG. 2 in the wearing state of the diaper shown in FIG. FIG. 4 is a cross-sectional view schematically showing a cross section taken along line II of FIG. 2 in the wearing state of the diaper shown in FIG. FIG. 5 is an enlarged perspective view schematically showing an example of the surface sheet according to the present invention. FIG. 6 is a schematic plan view of a part of the surface sheet of the diaper shown in FIG. FIG. 7 is a view corresponding to FIG. 2 of another embodiment of the absorbent article of the present invention. FIG. 8 is a cross-sectional view schematically showing a cross section along the vertical center line CLx of FIG. 7 when the diaper shown in FIG. 7 is worn. FIG. 9 is a cross-sectional view schematically showing a cross section along the thickness direction of one embodiment of an absorbent sheet that can be used as an absorber according to the present invention. FIG. 10 is a schematic perspective view of the absorbent sheet shown in FIG.

Detailed description of the invention

Although the techniques described in

Patent Documents

1 and 2 have improved absorption performance and leakage-proof performance of excreted body fluid as compared with conventional products, there is still room for improvement in this respect.

Therefore, the present invention relates to an absorbent article having excellent absorption performance of excreted body fluid and less likely to cause leakage.

Hereinafter, the present invention will be described based on the preferred embodiment with reference to the drawings. In the description of the drawings below, the same or similar parts are designated by the same or similar reference numerals. The drawings are basically schematic, and the ratio of each dimension may differ from the actual one.

The absorbent article of the present invention corresponds to the front-back direction of the wearer, that is, the direction extending from the ventral side to the dorsal side via the crotch portion (the direction indicated by the symbol "X" in the figure) and the vertical direction. It has orthogonal lateral directions (directions indicated by reference numerals “Y” in the figure).
In the following description, unless otherwise specified, the vertical direction is the vertical direction of the absorbent article or the direction along the vertical direction of its constituent members (for example, an absorber), and the horizontal direction is the lateral direction of the absorbent article or its constituent members (for example, an absorber). This is the direction along the lateral direction of the constituent members.
The absorbent article of the present invention is arranged in the crotch portion of the wearer, and is indicated by the inseam (indicated by reference numeral "B" in the figure) including the excretion portion facing portion (not shown) facing the excretion portion such as the wearer's penis. Part), the ventral part (the part indicated by the symbol "A" in the figure) arranged on the ventral side (front side) of the wearer from the inseam, and the dorsal side (posterior side) of the wearer from the crotch part. ) Is divided into three parts (the part indicated by the symbol "C" in the figure).
The absorbent article of the present invention comprises an absorber extending in the vertical direction through the lower crotch (member indicated by reference numeral "5" in the figure) and a surface sheet arranged on the skin-facing surface side of the absorber (reference numeral in the figure). (Member represented by "3").
1 to 4 show a disposable diaper 1 which is an embodiment of the absorbent article of the present invention, and the diaper 1 has the above-described configuration.

In the present specification, the "skin facing surface" is a surface of the absorbent article or a component thereof (for example, an absorber) that is directed toward the wearer's skin when the absorbent article is worn, that is, relative to the wearer's skin. The "non-skin facing surface" is the surface of the absorbent article or its constituents that faces the opposite side of the skin when the absorbent article is worn, that is, relatively far from the wearer's skin. On the side. The term "when worn" as used herein means a state in which the normal proper wearing position, that is, the correct wearing position of the absorbent article is maintained.

The ventral portion A and the dorsal portion C each include a portion that is typically located at the same position as the side seal portion S in the vertical direction X, that is, a waist circumference portion that is arranged around the waist circumference of the wearer when the diaper 1 is worn. .. The inseam B typically provides a region in which leg openings LS, LS, which are recesses for forming leg openings LH, LH, are formed on both side edges 10S along the vertical direction X of the exterior body 10. include. The inseam B bisects the unfolded and extended diaper 1 as shown in FIG. 2 in the vertical direction X and straddles the vertical center line CLx extending in the horizontal direction Y in the vertical direction X. The "expanded and extended state" as used herein means that the diaper 1 is separated by the side seal portion S to be in the expanded state, and the diaper 1 in the expanded state is extended with the elastic members of each part to have design dimensions (the influence of the elastic members is completely affected). It refers to the state in which it is expanded to the same size as when it is expanded in a flat shape in the excluded state).
In the present invention, the ventral portion A, the inseam B, and the dorsal portion C can be each region when the unfolded and extended diaper 1 is divided into three equal parts in the vertical direction X.

The diaper 1 is a so-called pants-type disposable diaper, and as shown in FIG. 1, has a pair of side seal portions S and S, a waist opening WH, and a pair of leg openings LH and LH. More specifically, the diaper 1 has an absorbent body 2 including a surface sheet 3 and an absorbent body 5 and a side farther from the wearer's skin than the absorbent body 2, that is, a non-skin facing surface side of the absorbent body 2. The exterior body 10 is provided on the ventral side A and the dorsal side C, respectively, and both side edge portions 10S along the vertical direction X of the exterior body 10 are joined to each other to form a pair of side seal portions S. , S, waist opening WH and a pair of leg openings LH, LH are formed. The absorbent body 2 and the exterior body 10 are joined by an adhesive 21.
The absorbent body 2 has a rectangular shape in a plan view, is arranged in the central portion of the exterior body 10 in the lateral direction Y so that its longitudinal direction coincides with the vertical direction X of the diaper 1, and is arranged from the ventral side A to the dorsal side. It extends in the vertical direction X over C.

The absorbent body 2 is a liquid-permeable surface sheet 3 arranged at a position relatively close to the wearer's skin, and a liquid-impermeable or impermeable surface sheet placed at a position relatively far from the wearer's skin. It is composed of a back surface sheet 4 having a property or water repellency (that is, leak-proof property) and an absorber 5 interposed between the

sheets

3 and 4. The absorber 5 includes an absorbent core 6 capable of absorbing and holding body fluid, and a core wrap sheet 7 that covers the outer surface of the absorbent core 6. These members constituting the absorbent main body 2 are integrated by a known joining means such as an adhesive. As these members constituting the absorbent main body 2, those normally used in this type of absorbent article may be used without particular limitation on the premise that the members are in accordance with the description described later. can.

As shown in FIGS. 3 and 4, the surface sheet 3 crosses the skin-facing surface side of the absorber 5 (a pair of standing portions 50 and non-standing portions 51, which will be described later) in the lateral direction Y, and is formed on the surface sheet 3. The extending portions 3E from both side edges (a pair of standing portions 50, 50) along the vertical direction X of the absorber 5 are wound around the non-skin facing surface side of the absorber 5.
In the present embodiment, the pair of extending

portions

3E and 3E of the surface sheet 3 are the absorber 5 (core wrap sheet 7) and the leak-proof cuff described later at the base end portion 81 of the leak-proof cuff 8 described later, respectively. It is fixed between the forming sheet 80 and the forming sheet 80. The surface sheet 3 does not cover the entire non-skin facing surface of the absorber 5, and is located at the center of the non-skin facing surface of the absorber 5 in the lateral direction Y (between the pair of base end portions 81, 81). The portion) is not covered with the surface sheet 3 (extending portion 3E).
In the present embodiment, the surface sheet 3 has a size capable of covering the entire skin-facing surface of the absorber 5, and the skin-facing surface of the absorber 5 and both side edges of the absorber 5 along the vertical direction X are formed therein. It covers the entire area of the absorber 5, and further covers a region extending inward in the lateral direction Y from both side edges on the non-skin facing surface of the absorber 5.

In the exterior body 10, in the unfolded and extended state of the diaper 1 as shown in FIG. 2, both end regions of the vertical direction X corresponding to the ventral side A and the dorsal side C are longer in the horizontal direction Y than in the vertical direction X. In the central region of the vertical direction X corresponding to the inseam B, which has a long rectangular shape, both

side edge portions

10S, 10S, that is, a pair of leg edge portions LS, LS along the vertical direction X of the central region are formed. It is curved in a convex arc shape toward the center in the lateral direction Y, and has an hourglass shape as the entire exterior body 10.

The exterior body 10 is arranged at a position relatively far from the absorber 5 and forms the outer surface of the diaper 1, and is arranged at a position relatively close to the absorber 5 to form the inner surface of the diaper 1. It is configured to include an inner layer sheet 12. Both

sheets

11 and 12 are joined to each other and integrated through a joining means such as an adhesive. In the present embodiment, as shown in FIG. 2, the outer layer sheet 11 has a longer length in the vertical direction X than the inner layer sheet 12, and has an extending portion 11E extending from the edge of the inner layer sheet 12 in the vertical direction X. The extending portion 11E is folded back toward the skin-facing surface side of the inner layer sheet 12 to cover the end portion of the absorbent main body 2 in the vertical direction X.

Both

sheets

11 and 12 constituting the exterior body 10 may be sheets of the same type or different types of sheets. The

sheets

11 and 12 may have elasticity, particularly elasticity in the lateral direction Y. As the

sheets

11 and 12, non-woven fabrics produced by various manufacturing methods can be used. Specifically, for example, a single-layer non-woven fabric or two layers made of an air-through non-woven fabric, a heat roll non-woven fabric, a spunlace non-woven fabric, a spunbond non-woven fabric, a melt blown non-woven fabric, or the like. The above-mentioned laminated non-woven fabric can be mentioned. Further, the

sheets

11 and 12 may be a composite sheet in which these non-woven fabrics and a film are laminated and integrated.

In this embodiment, gathers around the waist are formed on the ventral side A and the dorsal side C. The waist circumference gather is configured to include an exterior body 10 and a plurality of waist circumference gather forming elastic members 13 fixed to the exterior body 10. The plurality of elastic members 13 extend in the horizontal direction Y and are intermittently arranged in the vertical direction X. The waist circumference gather is fixed between the outer layer sheet 11 and the inner layer sheet 12 constituting the exterior body 10 in a state where the elastic member 13 is extended in the lateral direction Y, and then the elastic member 13 is released from the extended state. It is made by. When the diaper 1 is worn, the contraction of the elastic member 13 forms a substantially continuous annular waist circumference gather over the entire circumference of the diaper 1.

In the present embodiment, leg gathers are formed on the leg edge LS forming the opening edges of each of the pair of leg openings LH and LH. The leg gather includes an exterior body 10 and an elastic member 14 for forming leg gathers fixed to the exterior body 10. The leg gather is manufactured by fixing the elastic member 14 in the stretched state between the outer layer sheet 11 and the inner layer sheet 12 constituting the exterior body 10, and then releasing the elastic member 14 from the stretched state. When the diaper 1 is worn, the contraction of the elastic member 14 forms the annular leg gathers that are substantially continuous over the entire circumference of the opening edge of the leg opening LH. The number of elastic members 14 may be one or a plurality.

In the present embodiment, a pair of leakage-

proof cuffs

8 and 8 are provided on both sides of the absorbent body 2 (absorbent body 5) along the vertical direction X. Each of the leak-proof cuffs 8 is configured to include a liquid-resistant or water-repellent and breathable leak-proof cuff forming sheet 80, and the sheet 80 is folded in two in the lateral direction Y. It contains a layered part. Each leak-proof cuff 8 (leak-proof cuff forming sheet 80) is continuously arranged along the side portion of the absorbent body 2 along the vertical direction X over substantially the entire length of the absorbent body 2 in the vertical direction X. There is. As the leak-proof cuff forming sheet 80, those used as the material of the leak-proof cuff in this type of absorbent article can be used without particular limitation. For example, a single-layer or multi-layer water-repellent non-woven fabric or a resin film can be used. A laminate material such as a non-woven fabric and the like can be used.

The leak-proof cuff 8 has a base end portion 81 in which the leak-proof cuff forming sheet 80 is fixed to another member, and an upright portion 82 in which the sheet 80 stands up on the wearer side. The upright portion 82 is a non-fixed portion of the leak-proof cuff forming sheet 80 with other members. The standing portion 82 is present at least in the inseam B.

The base end portion 81 is a portion that serves as a standing base end when the standing portion 82 stands up toward the wearer's skin side when the diaper 1 is worn, and the leak-proof cuff forming sheet 80 adheres to the hot melt or the like. It is a portion fixed to another member, specifically, the absorbent body 2 and / or the exterior body 10 by a known fixing means such as an agent or heat fusion. The base end portion 81 extends continuously or discontinuously in the vertical direction X over substantially the entire length of the leak-proof cuff forming sheet 80 in the vertical direction X.

The upright portion 82 is partially elastic in the vertical direction X.
In the present embodiment, as shown in FIG. 3, the first elastic member 83 for forming a leak-proof cuff is vertically formed at the free end portion of the standing portion 82 (the portion closest to the wearer's skin when the standing portion 82 is standing). A second elastic member 84 for forming a leak-proof cuff extends in the vertical direction X at an intermediate position between the free end portion and the base end portion 81 of the upright portion 82 so as to extend in the direction X. It is arranged like this. Each

elastic member

83, 84 is fixed between the leakage-proof

cuff forming sheets

80, 80 forming a two-layer structure by a fixing means such as an adhesive in an elongated state. The upright portion 82 has elasticity in the vertical direction X at the fixed portions of the

elastic members

83 and 84.
The number of

elastic members

83 and 84 is not particularly limited, and may be one or a plurality of elastic members, respectively. The second elastic member 84 for forming a leak-proof cuff (an elastic member arranged at an intermediate position between the free end portion and the base end portion 81 of the standing portion 82) may not be provided.

At both ends of the leak-proof cuff 8 in the vertical direction X, standing-inhibiting portions 85, which are portions in which the standing of the leak-proof cuff forming sheet 80 is inhibited, are formed. The standing portion 85 is formed on the ventral side A and the dorsal side C, and the portion sandwiched between the standing blocking

portions

85 and 85 is the standing portion 82. FIG. 4 shows an orthostatic inhibition portion 85 of the dorsal portion C. The standing inhibition portion 85 is formed by fixing the leak-proof cuff forming sheet 80 to the skin-facing surface (surface sheet 3) of the absorbent main body 2 by the fixing portion 86. The fixing portion 86 can be formed by using an adhesive such as hot melt or a known fixing means such as heat fusion. Although not shown, the orthostatic portion 85 of the ventral portion A is also configured in the same manner as the orthostatic portion 85 of the dorsal portion C.

As described above, since the pair of standing-inhibiting

portions

85 and 85 are formed at both ends of the leakage-proof cuff 8 in the vertical direction X, they are sandwiched between the standing-inhibiting

portions

85 and 85 when the diaper 1 is worn. As shown in FIG. 3, the upright portion 82, which is a portion, stands up toward the skin side of the wearer with the base end portion 81 as the upright base end due to the contraction force of the

elastic members

83 and 84 for forming the leak-proof cuff. In such an upright state of the leak-proof cuff 8, the upright standing portion 82 blocks the outward movement of body fluid such as urine excreted by the wearer in the lateral direction Y, so that the side of the absorber 5 described later In combination with the effect of blocking the body fluid by the pair of standing

portions

50, 50 on both sides in the direction Y, lateral leakage is effectively suppressed.
Further, although not shown, in the upright state of the leak-proof cuff 8, the entire diaper 1 is formed by the contraction force of the

elastic members

83 and 84 for forming the leak-proof cuff, and the central portion of the absorbent body 2 in the vertical direction X is formed. Since the diaper 1 is curved and deformed so as to be convex toward the non-skin facing surface side (back surface sheet 4 side), the diaper 1 can easily fit the wearer's body shape.

The absorber 5 is located at least on the inseam B on both sides of the central portion of the absorber 5 in the lateral direction Y, and is a pair of standing

portions

50, 50 that stand up toward the wearer's skin side when worn. , Which is located in the central portion and has a non-standing portion 51 sandwiched between the pair of standing

portions

50, 50.

In the present embodiment, as shown in FIG. 3, both side edges of the absorber 5 along the vertical direction X or its vicinity (specifically, for example, a region within 10 mm from the side edges of the absorber 5 along the vertical direction X). A side elastic member 52 for erecting the upright portion 50 is arranged therein. The side elastic member 52 is arranged between the absorber 5 and the surface sheet 3 in a state of being extended in the vertical direction X, and is known to be at least on the absorber 5 and further on the surface sheet 3 as an adhesive or the like. It is fixed by the fixing means of. The side elastic members 52 are arranged at least in the inseam B, and may be one or a plurality of side elastic members 52 as shown in the drawing.

Although not shown, the side elastic member 52 may be arranged inside the absorber 5. Specifically, for example, the side elastic member 52 extends in the vertical direction X between the absorbent core 6 and the core wrap sheet 7 at or near both side edges of the absorber 5 along the vertical direction X. It may be arranged by. In that case, the side elastic member 52 can be fixed to one or both of the absorbent core 6 and the core wrap sheet 7 by a known fixing method such as an adhesive.

In the present embodiment, the side elastic members 52 are fixed to both sides of the absorber 5 in the lateral direction Y in the extended state, so that when the diaper 1 is worn, as shown in FIG. Both side portions of the absorber 5 in the lateral direction Y stand up toward the wearer's skin side as a pair of standing

portions

50, 50 due to the contraction of the side elastic member 52. At this time, in the cross-sectional view along the lateral direction Y as shown in FIG. 3, the absorber 5 has a pair of standing portions 50, with the non-standing portion 51 as the bottom and extending diagonally from the bottom toward the skin side of the wearer. It has a tray shape with 50 as a side part.

Unless otherwise specified, various known elastic materials usually used for this kind of absorbent article can be used without particular limitation as the material of various elastic members in the diaper 1, including the side elastic member 52. Examples thereof include synthetic rubbers such as styrene-butadiene, butadiene, isoprene and neoprene, natural rubbers, EVA, elastic polyolefins and polyurethanes. As the form of the elastic member, a thread-like (thread rubber, etc.) or string-like (flat rubber, etc.) having a rectangular, square, circular, or polygonal cross section, or a multifilament type thread-like member is preferably used. can.

In the diaper 1, in addition to the above-mentioned "configuration in which both sides of the absorbent body 5 in the lateral direction Y stand on the skin side of the wearer as a pair of standing

portions

50, 50", the skin facing surface of the absorbent body 5 is further provided. As the surface sheet 3 to cover, an uneven surface sheet having irregularities formed on the surface is adopted. Specifically, as shown in FIGS. 3 and 4, the pair of

upright portions

50, 50 and the non-upright portions 51 of the surface sheet 3 project toward the skin side of the wearer on the portions covering the skin-facing surfaces. Concavo-

convex regions

30A and 30B including a plurality of convex portions 31 and concave portions 32 located around the convex portions 31 are formed. The uneven region 30A is a portion of the surface sheet 3 that covers the skin-facing surface of the absorber 5, and is a portion corresponding to the upright portion 50, and the uneven region 30B is a portion corresponding to the non-upright portion 51. In the present embodiment, the surface sheet 3 is one continuous sheet, and the uneven region 30A and the uneven region 30B are continuous.

FIG. 5 shows a surface sheet 3A as an example of the surface sheet according to the present invention. The surface sheet 3A can be used as the surface sheet 3 in the diaper 1. Unless otherwise specified, the description of the surface sheet 3A can be appropriately applied to the surface sheet 3. The surface sheet 3A has a laminated structure (two-layer structure) of two sheets (first sheet 35 and second sheet 36). The surface sheet 3A has an uneven region on one surface (skin facing surface) including a convex portion 31 projecting toward the skin side of the wearer and a concave portion 32 located around the convex portion 31. ing.

The surface sheet 3A is formed by partially squeezing the raw material sheets (first sheet 35, second sheet 36), which are the raw materials thereof. The material for forming the raw material is compacted to form a concave portion 32, and the portion not subjected to the pressing process protrudes to one side in the thickness direction, specifically to the skin facing surface side, and becomes a convex portion 31. Further, due to the fact that the convex portion 31 and the concave portion 32 are formed depending on the presence or absence of the pressing process, the convex portion 31 that is not subjected to the pressing process is subjected to a low density portion and a pressing process having a relatively low density. The recess 32 to be formed is a high-density portion having a relatively high density. As the pressing process, a known method can be used without particular limitation, and examples thereof include embossing with or without heat, and ultrasonic embossing.

In the surface sheet 3A, a plurality of joints, that is, recesses 32 (high-density portions) are formed by partially joining the laminated first sheet 35 and second sheet 36 by squeezing. By such squeezing, the first sheet 35 projects in a direction away from the second sheet 36 at a portion other than the recess 32, so that the convex portion 31 (low density portion) projecting toward the wearer's skin side is formed. It is formed. In the recess 32, the two

sheets

35 and 36 are integrally pressed by pressing, and preferably, the heat is generated between the two

sheets

35 and 36 due to the melting and subsequent solidification of the constituent resins of one or both sheets. It is fused.
In the surface sheet 3A, the skin-facing surface (the surface facing the first sheet 35) and the non-skin-facing surface of the second sheet 36 are both substantially flat, whereas the skin-facing surface and the non-skin-facing surface of the first sheet 35 are both substantially flat. Both surfaces (surfaces facing the second sheet 36) are formed with large undulating irregularities.

In the surface sheet 3A, a plurality of convex portions 31 are arranged in a scattered pattern, and more specifically, in a staggered pattern. That is, in the surface sheet 3A, a plurality of convex portion rows in which a plurality of convex portions 31 are linearly arranged in a row at predetermined intervals in the horizontal direction Y are arranged in a plurality of rows in the vertical direction X and in the horizontal direction Y. In, the convex portions 41 are displaced from each other by the adjacent convex portions rows. In other words, in the surface sheet 3A, the plurality of convex portions 31 in which the plurality of convex portions 31 are linearly arranged in a row at predetermined intervals in the vertical direction X are orthogonal to each other in the vertical direction X. When projected in the lateral direction Y, the projection image of each convex portion 31 in a specific convex portion row (for example, an intermediate position between two adjacent

convex portions

31 and 31 in the specific convex portion row) A plurality of convex portions 31 are arranged in a staggered manner so that a projected image of the convex portions 31 in another convex portion row adjacent to the specific convex portion row in the lateral direction Y is arranged.

As the first sheet 35 and the second sheet 36 constituting the surface sheet 3A, various non-woven fabrics, woven fabrics, fiber sheets such as knitted fabrics, films and the like can be used, but the fiber sheets may be used from the viewpoint of touch and the like. It is preferable to use, and it is particularly preferable to use a non-woven fabric. Both

sheets

35 and 36 may be of the same type or different types of sheets.
The basis weights of the first sheet 35 and the second sheet 36 are preferably 10 g / m ² or more, more preferably 15 g / m ² or more, and preferably 50 g / m ² or less, more preferably 30 g / m ^{2, respectively.} It is as follows.

One of the main features of the diaper 1 is that the uneven region (pattern of the convex portion 31) of the surface sheet 3 is different between the upright portion 50 and the non-upright portion 51. That is, the convex portion 31 constituting the concave-

convex region

30A and 30B of the surface sheet 3 includes a plurality of types of convex portions having different protrusion heights or areas, and the concave-convex region 30A of the upright portion 50 is a non-upright portion. The protruding height or area of the convex portion 31 is smaller than that of the uneven region 30B of 51. That is, "the protruding height of the convex portion 31 of the uneven region 30A <the protruding height of the convex portion 31 of the concave-convex region 30B" and "the area of the convex portion 31 of the concave-convex region 30A <the area of the convex portion 31 of the concave-convex region 30B". The magnitude relationship of at least one of them is established.

The "protruding height of the convex portion 31 of the uneven region 30A" refers to the average value of the protruding heights of the plurality of convex portions 31 existing in the concave-convex region 30A, and refers to the area of the convex portion 31 of the concave-convex region 30A. Refers to the average value of the areas of the plurality of convex portions 31 existing in the concave-convex region 30A. The same applies to the protruding height and area of the convex portion 31 of the concave-convex region 30B. The protruding height and area of the convex portion 31 are measured by the following method.

<Measuring method of protruding height of convex part>
The uneven region of the surface sheet 3 to be measured is cut in the thickness direction using a cutting tool such as a sharp razor, and the cut surface is observed to be located near the convex portion 31 on the skin-facing surface of the concave-convex region. The distance between the (concave portion 32) and the top of the convex portion 31, that is, the virtual straight line extending horizontally through the bottom of the concave portion 32 and the virtual straight line extending horizontally through the top of the convex portion 31. The shortest distance between the two virtual straight lines (the length between the vertical lines orthogonal to the two virtual straight lines) is measured under no load and is taken as the protruding height of the convex portion 31. The protruding height of the convex portion 31 corresponds to the apparent thickness of the surface sheet 3. When observing the cut surface with the naked eye, for example, the cut surface is observed and measured at a magnification of 20 to 100 times using a microscope (VHX-1000 manufactured by KEYENCE). You may.
For each of the five regions arbitrarily selected from one target region (for example, the

uneven region

30A or 30B), the protruding height of the convex portion 31 is measured by the above procedure, and the average value of the measured values of the five regions is calculated. Let it be the protruding height of the convex portion 31 of the target region.

<Measuring method of convex area>
A rectangular shape in a plan view having a length of 50 mm in the vertical direction and a rectangular shape in the horizontal direction of 20 mm is cut out from one target area (for example, an

uneven area

30A or 30B) to form a measurement piece, which is attached to a flat acrylic plate to form a measurement piece and an acrylic plate. To prepare a laminate of. In the laminated body, the non-skin facing surface of the measuring piece is in contact with the acrylic plate, and the skin facing surface of the measuring piece is exposed. The laminate is placed on a general stamp stand used for stamping rubber stamps (for example, Unistamp (trade name) manufactured by Mitsubishi Pencil Co., Ltd., red), and the measurement piece is placed below (acrylic plate). Place it on the top) so that the surface of the measurement piece facing the skin and the ink on the stamp pad are in contact with each other. Next, the laminate is pressed against the stamp pad side at 1.2 kPa to attach ink to the skin-facing surface of the measurement piece. The surface of the measurement piece to which ink is attached facing the skin is also referred to as an ink surface. Next, the measurement piece is placed on a blank sheet of paper with the ink side facing down, and the pressure is applied from the top of the acrylic plate at 1.2 kPa to transfer the ink to the blank sheet of paper. The portion where the ink is transferred to this blank paper (contact portion) is a convex portion, and the portion where the ink is not transferred (non-contact portion) is a concave portion. The ink transfer surface of this blank sheet is observed with a microscope (VHX-1000 manufactured by KEYENCE) at a magnification of 20 to 100 times, and the area of the convex portion is measured using an image analyzer.

When measuring the protruding height and area of the convex portion of the surface sheet of the absorbent article in the state of being compressed and filled in the package, the surface sheet taken out from the absorbent article is subjected to normal temperature and pressure for 1 day or more. After leaving it to stand, measure in the same manner as described above.

In the present embodiment, as shown in FIG. 6, the surface sheet 3 includes two types of

convex portions

31A and 31B having different protrusion heights or areas as the convex portions 31. The small convex portion 31A having a relatively small protrusion height or area exists in the uneven region 30A of the surface sheet 3 that covers the skin-facing surface of the upright portion 50 (both sides of the absorber 5 in the lateral direction Y), and protrudes. The large convex portion 31B having a relatively large height or area exists in the uneven region 30B of the surface sheet 3 that covers the skin-facing surface of the non-standing portion 51 (the central portion of the absorber 5 in the lateral direction Y). ..
The small convex portion 31A and the large convex portion 31B may differ in only one of the protruding height and the area, or both may be different. In the illustrated form, the small convex portion 31A and the large convex portion 31B are different from each other in both the protruding height and the area.
The uneven region 30A includes a plurality of small convex portions 31A and concave portions 32A located around the small convex portions 31A. The uneven region 30B includes a plurality of large convex portions 31B and concave portions 32B located around the large convex portions 31B.
In the following, the "small convex portion 31A" and the "large convex portion 31B" may be collectively referred to as the "convex portion 31", and the "recessed portion 32A" and the "recessed portion 32B" may be collectively referred to as the "recessed portion 32".

In the present invention, the convex portion 31 may include three or more types of convex portions having different protrusion heights or areas. That is, the convex portion 31 may include one type or two or more types of convex portions (middle convex portions) whose protruding height or area is between the small convex portion 31A and the large convex portion 31B. In that case, the middle convex portion has the above-mentioned "protruding height of the convex portion 31 of the uneven region 30A <protruding height of the convex portion 31 of the uneven region 30B" and the "area of the convex portion 31 of the uneven region 30A <concavo-convex region". On the premise that the magnitude relationship of at least one of "the area of the convex portion 31 of 30B" is established, it may be arranged in the concave-convex region 30A corresponding to the upright portion 50, and the concave-convex region 30B corresponding to the non-standing portion 51. May be placed in.

As described above, the diaper 1 has the size (protruding height or protrusion height) of the absorber 5 in which both sides in the lateral direction Y stand up toward the skin side of the wearer as standing portions 50 and the convex portion 31 in the uneven region on the skin facing surface. By providing the surface sheet 3 having a non-uniform area), the absorption performance of body fluids such as urine is excellent, and leakage is unlikely to occur.
More specifically, since both sides of the absorber 5 in the lateral direction Y are a pair of standing

portions

50, 50 that stand up toward the wearer's skin side when worn, lateral leakage of body fluid such as urine occurs. It's hard to happen.
Further, in general, a concavo-convex surface sheet such as the surface sheet 3 can control the flow of liquid (liquid diffusion) on the skin-facing surface by the concavo-convex region of the skin-facing surface. If the protruding height or area of the convex portion constituting the uneven region is large, it is advantageous in terms of controlling liquid diffusion, but on the other hand, the liquid drawing property is inferior, and if the protruding height or area of the convex portion constituting the uneven region is small, , The opposite tendency becomes remarkable, and there is a possibility that the liquid diffuses excessively, leading to leakage and deterioration of the touch. In this regard, in the diaper 1, as described above, the magnitude relationship of "concavo-convex region 30A <concave-convex region 30B" is established with respect to the protruding height and / or area of the convex portion 31, and more specifically, the upright portion 50 The small convex portion 31A is arranged in the uneven region 30A covering the skin facing surface, and the large convex portion 31B is arranged in the uneven region 30B covering the skin facing surface of the non-standing portion 51, so that the liquid diffusion in the surface sheet 3 is prevented. Since control and liquid withdrawal are highly compatible, absorption performance is significantly improved compared to conventional products.
That is, when the diaper 1 is worn, the pair of standing

portions

50, 50 on both sides of the absorber 5 in the lateral direction Y are in the standing state as shown in FIG. 3, blocking body fluids such as urine existing on the surface sheet 3. Since it is stopped, lateral leakage is prevented, and the body fluid on the surface sheet 3 (concavo-convex region 30A) covering the skin facing surface of each standing portion 50 is quickly drawn to the standing portion 50 side and absorbed, so that the surface is absorbed. It is difficult for the liquid to remain on the sheet 3 and a good dry feeling can be obtained. Further, in the central portion of the diaper 1 (absorbent main body 2) in the lateral direction Y, the diffusion of body fluid is appropriately controlled by the action of the surface sheet 3 (concavo-convex region 30B) covering the skin-facing surface of the non-standing portion 51. The body fluid is drawn into the non-standing portion 51 and absorbed without causing leakage or deterioration of the touch.

In particular, in the present embodiment, in the concave-convex region 30B of the non-standing portion 51, the convex portions 31 (large convex portions 31B) are arranged in a staggered pattern as shown in FIG. ) It is difficult to connect with each other. The recess 32 can function as a flow path for body fluids such as urine excreted by the wearer of the diaper 1, but if a plurality of recesses 32 are connected to form one continuous recess, the concave-convex region 30B Excessive liquid diffusion may occur, leading to leakage and deterioration of the touch. By arranging the convex portions 31 (large convex portions 31B) in a staggered pattern, such inconvenience can be effectively suppressed. In the surface sheet 3 shown in FIG. 6, the convex portions 31 (small convex portions 31A) are arranged in a staggered pattern even in the uneven region 30A of the upright portion 50, and the same effect can be obtained.

From the viewpoint of ensuring that the above-mentioned action and effect are more reliably performed, it is preferable to set the dimensions and the like of each part of the diaper 1 as follows.
The ratio of the protruding height of the small convex portion 31A to the protruding height of the large convex portion 31B is preferably 0.5 or more, more preferably 0.65 or more, and more preferably 0.65 or more as the former / the latter, assuming the former <the latter. It is preferably 0.95 or less, more preferably 0.90 or less.
The protruding height of the small convex portion 31A is preferably 0.3 mm or more, more preferably 0.6 mm or more, and preferably 4 mm or less, assuming that the protruding height of the small convex portion 31A is smaller (lower) than the protruding height of the large convex portion 31B. More preferably, it is 3 mm or less.
Assuming that the protruding height of the large convex portion 31B is larger (higher) than the protruding height of the small convex portion 31A, it is preferably 0.5 mm or more, more preferably 1 mm or more, and preferably 5 mm or less, more preferably. Is 4 mm or less.

The ratio of the area of the small convex portion 31A to the area of the large convex portion 31B is preferably 0.1 or more, more preferably 0.15 or more, and preferably 0.15 or more as the former / the latter, assuming the former <the latter. It is 0.9 or less, more preferably 0.8 or less.
^{The area of the small convex portion 31A is preferably 1 mm 2} or more, more preferably 2 mm ² or more, and preferably 15 mm ² or less, more preferably 10 mm ² or less, assuming that the area of the small convex portion 31A is smaller than the area of the large convex portion 31B. be.
^{The area of the large convex portion 31B is preferably 5 mm 2} or more, more preferably 10 mm ² or more, and preferably 30 mm ² or less, more preferably 25 mm ² or less, assuming that the area of the large convex portion 31B is larger than the area of the small convex portion 31A. be.

The length (width) of the lateral Y of each of the standing portions 50 is preferably 10% or more, more preferably 15% or more, and preferably 45, with respect to the total length (total width) of the horizontal Y of the absorber 5. % Or less, more preferably 40% or less.
The length (width) of the non-standing portion 51 in the lateral direction Y is preferably 10% or more, more preferably 20% or more, and preferably 80 with respect to the total length (total width) of the absorber 5 in the lateral direction Y. % Or less, more preferably 70% or less.
The "total width of the absorber 5" as used herein means the total width of the absorber 5 at the location where the upright portion 50 exists.
The length (width) of each of the standing portions 50 in the lateral direction is preferably 10 mm or more, more preferably 20 mm or more, and preferably 60 mm or less, more preferably 50 mm or less.
The length (width) of the non-standing portion 51 in the lateral direction Y is preferably 20 mm or more, more preferably 40 mm or more, and preferably 150 mm or less, more preferably 130 mm or less.

It is preferable that the uneven region 30A of the upright portion 50 has a larger number of convex portions 31 (small convex portion 31A, large convex portion 31B) per unit area than the uneven region 30B of the non-upright portion 51. An increase in the number of the convex portions 31 per unit area leads to an increase in the number of the concave portions 32. The concave portions 32 are typically squeezed in the surface sheet 3 as described above. It is a part and therefore has a relatively high fiber density and excellent liquid drawability. Therefore, with respect to the number of convex portions 31 per unit area, the magnitude relationship of "concave-convex region 30A of the upright portion 50> concavo-convex region 30B of the non-standing portion 51" is established, so that the liquid can be drawn in particularly in the concavo-convex region 30A. It can be further improved and the above-mentioned action and effect can be more reliably achieved. The number of convex portions 31 per unit area is measured by the following method.

<Measuring method of the number of convex parts of the surface sheet per unit area>
A quadrangular shape in a plan view having a length of 50 mm in the vertical direction and 20 mm in the horizontal direction is cut out from the surface sheet to be measured and used as a test piece. The test piece is observed with a microscope (for example, a microscope manufactured by KEYENCE, VHX-1000) at an observation magnification of 20 to 100 times, and the number of convex portions of the test piece is measured. The value obtained by dividing the measured value by the area of the test piece (1000 mm ² ) is defined as the number of convex portions of the surface sheet to be measured per unit area.

The ratio of the number of convex portions 31 (small convex portions 31A) of the uneven region 30A per unit area to the number of convex portions 31 (large convex portions 31B) of the uneven region 30B per unit area is based on the premise that the former ≥ the latter. The former / latter is preferably 1 or more, more preferably 2 or more, and preferably 10 or less, more preferably 5 or less.
It is preferable that the number of convex portions 31 (small convex portions 31A) of the uneven region 30A per unit area is larger than the number of convex portions 31 (large convex portions 31B) of the uneven region 30B per unit area. 25 pieces / 1000 mm ² or more, more preferably 50 pieces / 1000 mm ² or more, and preferably 175 pieces / 1000 mm ² or less, more preferably 150 pieces / 1000 mm ² or less.
The number of convex portions 31 (large convex portions 31B) of the uneven region 30B per unit area is preferably smaller than the number of convex portions 31 (small convex portions 31A) of the uneven region 30A per unit area. 10 pieces / 1000 mm ² or more, more preferably 25 pieces / 1000 mm ² or more, and preferably 75 pieces / 1000 mm ² or less, more preferably 50 pieces / 1000 mm ² or less.

It is preferable that the uneven region 30A of the upright portion 50 has a larger microcompression value measured by the following method than the uneven region 30B of the non-upright portion 51. The smaller the micro-compression value, the softer the measurement target. Therefore, the fact that the magnitude relationship of "micro-compression value of uneven region 30A> micro-compression value of uneven region 30B" is established means that the concave-convex region 30B is softer than the concave-convex region 30A, that is, the concave-convex region 30A is compared with the concave-convex region 30B. It is hard. The uneven region 30A is a portion that is more likely to come into contact with the skin of the wearer of the diaper 1 than the uneven region 30B. By establishing such a magnitude relationship, the convex portion 31 (small convex portion 31A) of the uneven region 30A is established. ) Is improved, the convex portion 31 is not easily crushed even if it comes into contact with the skin, and the contact area with the skin is maintained in a relatively small area for the uneven region 30A. As a result, the skin after excretion of body fluid is maintained. Stickiness is reduced.

<Measurement method of minute compression value>
Using a commercially available measuring device (KES-FB3 compression tester manufactured by Kato Tech Co., Ltd.), calculate the characteristic value of ^{[0.3 to 1 (gf / cm 2) / mm] when the surface sheet to be measured is under a small load.} did. The average of the characteristic values at any nine points of the surface sheet to be measured was taken as the minute compression value of the surface sheet. The measurement conditions were a compression speed of 0.02 mm / s, a compression load of 10 gf / cm ² , and a measurement distance of 0.8 mm.

The ratio of the micro-compression value of the concavo-convex region 30A to the micro-compression value of the concavo-convex region 30B is preferably 1.1 or more, more preferably 1.5 or more, and preferably 1.5 or more as the former / the latter, assuming the former> the latter. Is 10 or less, more preferably 5 or less.
The micro-compression value of the concavo-convex region 30A is preferably 4 (gf / cm ² ) / mm or more, more preferably 5 (gf / cm ² ) / mm or more, assuming that it is larger than the micro-compression value of the concavo-convex region 30B. , And preferably 15 (gf / cm ² ) / mm or less, more preferably 10 (gf / cm ² ) / mm or less.
^{The micro-compression value of the concavo-convex region 30B is preferably 0.5 (gf / cm 2} ) / mm or more, more preferably 1 (gf / cm ² ) /, on the assumption that it is smaller than the micro-compression value of the concavo-convex region 30A. It is mm or more, preferably 10 (gf / cm ² ) / mm or less, and more preferably 8 (gf / cm ² ) / mm or less.

In the present embodiment, as shown in FIG. 6, in the surface sheet 3, the boundary between the small convex portion 31A having a relatively small protruding height or area and the large convex portion 31B having a relatively large protruding height or area. When the line BL extends in the vertical direction X, it is preferable that the standing starting point of the standing portion 50 exists at a position where the boundary line BL and the absorber 5 (standing portion 50) overlap in the thickness direction. The boundary line BL is also a boundary line between the uneven region 30A and the uneven region 30B. Here, "existing at a position where the boundary line BL and the absorber 5 (standing portion 50) overlap in the thickness direction" means that at least a part, preferably all of the standing starting points of the standing portion 50 are on the boundary line BL. It means that it is located or is located within 15 mm in the lateral direction Y from the boundary line BL. Since the boundary line BL between the small convex portion 31A (concave and convex region 30A) and the large convex portion 31B (concave and convex region 30B) in the surface sheet 3 has different bending rigidity of the large and small irregularities, the absorber 5 joined to the surface sheet 3 Can function as a deformation guiding portion (flexible shaft) when deforming, but the standing portion 50 exists in the thickness direction of the boundary line BL and the absorber 5 (standing portion 50) so that the standing portion 50 can function as a deformation guiding portion (flexible shaft). Can stand up more reliably.

As for the standing starting point of the standing portion 50, for example, the non-skin facing surface of the absorber 5 and another member (for example, the exterior body 10) arranged to face the non-skin facing surface thereof are partially adhered to the non-standing portion 51 as a center. When joined by, it can be the boundary between the joined portion and the non-joined portion. In that case, as described above, the boundary between the joint portion and the non-joint portion is preferably located on the boundary line BL or in a region within 30 mm in the lateral direction Y from the boundary line BL.

Further, for example, the standing starting point of the standing portion 50 may be a portion where a rigidity difference (density difference) occurs in the absorber 5 (absorbent core 6). When the non-standing portion 51 has a low basis weight portion in which the material for forming the absorber 5 (absorbent core 6) is smaller than that in the peripheral portion, as in the diaper 1A (see FIG. 7) described later, the low basis weight portion is present. The quantity part can be the standing starting point of the standing part 50. In that case, as described above, the low basis weight portion is preferably located on the boundary line BL or in a region within 30 mm in the lateral direction Y from the boundary line BL.

The low basis weight portion is a portion of the non-standing portion 51 of the absorber 5 that has a smaller basis weight than a peripheral portion (for example, a region within 10 mm from the low basis weight portion). In 1) the form in which the material for forming the absorber 5 (absorbent core 6) does not exist in the low basis weight portion (that is, the form in which the basis weight of the absorber forming material is zero) and 2) in the low basis weight portion. The form in which a small amount of the absorber-forming material is present as compared with the peripheral portion is included. The low basis weight portion of the form 1) is a through hole that penetrates the non-standing portion 51 in the thickness direction. The basis weight of the low basis weight portion of the form 2) is preferably 20% or less, more preferably 10% or less, based on the basis weight of the peripheral portion of the non-standing portion 51. In any form, the low basis weight portion is a low rigidity portion having a lower rigidity than the peripheral portion of the low basis weight portion in the non-standing portion 51. The form of the low basis weight portion (shape in plan view, number, arrangement, etc.) is not particularly limited, and can be appropriately set in consideration of the standing property of the standing portion 50 and the like.

In the present embodiment, as shown in FIG. 3, the outer end portion of the upright portion 50 in the lateral direction Y (the portion where the side elastic member 52 is arranged and its vicinity) does not contain a water-absorbing polymer (hereinafter, “configuration”). Also called "A"). Here, "does not contain a water-absorbent polymer" means that the content of the water-absorbent polymer at the outer end portion of the standing portion 50 in the lateral direction Y is preferably 30 with respect to the total mass of the outer end portion. It means that it is mass% or less, more preferably 10 mass% or less.
In addition, in the present embodiment, the portion of the surface sheet 3 that covers the outer end portion of the upright portion 50 in the lateral direction Y does not have irregularities on the surface (hereinafter, also referred to as “configuration B”). More specifically, in the present embodiment, the portion of the surface sheet 3 that covers the outer end portion of the upright portion 50 in the lateral direction Y has a single-layer structure and does not have irregularities on the surface (hereinafter, "configuration"). Also called "B'"). For example, when the surface sheet 3 is the surface sheet 3A having a two-layer structure shown in FIG. 5, the outer end portion of the upright portion 50 in the lateral direction Y of the portion of the surface sheet 3A that covers the skin-facing surface of the absorber 5 is used. The portion other than the covering portion is composed of a two-layer structure of the first sheet 35 and the second sheet 36, and the portion covering the outer end portion is composed of only the second sheet 36, whereby the configuration B'is realized. NS.
By including the configuration A and the configuration B or B'in the diaper 1, the standing portion 50 can stand up more reliably, and lateral leakage can be prevented more reliably. The outer end portion of the upright portion 50 in the lateral direction Y is preferably within 20 mm, more preferably 10 mm, from the side edge (outer edge of the upright portion 50) along the vertical direction X of the absorber 5 to the inner side in the lateral direction Y. It can be within the area.

In the diaper 1, the composition of the absorber 5 (absorbent core 6) is not particularly limited, and those normally used for this type of absorbent article can be used without particular limitation. As the absorbent core 6 which is the main component of the absorber 5, for example, a pulp layer containing pulp can be used. The pulp layer can be produced according to a conventional method using a known fiber stacking device equipped with a rotating drum. The pulp layer typically contains a fiber aggregate mainly composed of wood pulp such as NBKP and LBKP. The fiber aggregate may contain a water-absorbent polymer. As the water-absorbent polymer contained in the fiber aggregate, a particulate polymer having a spherical shape, a lump shape, a bale shape, an indefinite shape or the like is usually used, but a fibrous shape may be used.

In the present embodiment, as shown in FIG. 3, the absorbent core 6 is an absorbent sheet including a fiber sheet facing each other and a water-absorbing polymer arranged between the fiber sheets. The absorbent sheet has a feature that the fiber material is smaller than that of the pulp layer, the thickness is thin, and the absorbent sheet has sufficient liquid absorption performance while being thin. When the absorber 5 includes the absorbent sheet having such a feature, the upright portion 50 can stand up more reliably and lateral leakage can be prevented more reliably.

The fiber sheet constituting the absorbent sheet is a sheet having liquid permeability or liquid absorption, and is typically a sheet mainly composed of fibers, that is, a sheet having a fiber content of more than 50% by mass. Examples of the constituent fibers of the fiber sheet include wood pulp such as coniferous pulp and broadleaf pulp, natural fiber such as non-wood pulp such as cotton pulp and hemp pulp; and modified pulp such as cationized pulp and marcelled pulp (above, Cellular fibers); Synthetic fibers composed of resins such as polyethylene and polypropylene can be mentioned, and one of these fibers can be used alone or in combination of two or more.
Examples of the form of the fiber sheet include paper, woven fabric, and non-woven fabric. Examples of the non-woven fabric include air-through non-woven fabric, heat roll non-woven fabric, spunlace non-woven fabric, spunbond non-woven fabric, melt-blown non-woven fabric, and spunbond-melt-blown-span. Bond (SMS) non-woven fabric can be mentioned. The fiber sheet typically has a single-layer structure composed of one of these types, but may also have a laminated structure in which two or more types are laminated and integrated.
In the absorbent sheet, the fiber sheets facing each other with the water-absorbent polymer interposed therebetween may have the same composition and form, or may be different from each other.
In the absorbent sheet, the opposing fiber sheets are typically bonded together via an adhesive. Further, the water-absorbent polymer may also be bonded to the fiber sheet via an adhesive. As the adhesive used for the absorbent sheet, an adhesive that can be used for joining members in this type of absorbent article can be used without particular limitation, and examples thereof include a hot melt adhesive.

The basis weight per fiber sheet constituting the absorbent sheet is preferably 4 g / m ² or more, more preferably 6 g / m ² or more, and preferably 50 g / m ² or less, more preferably 30 g / m. It is m ² or less.
In the absorbent sheet, the basis weight of the water-absorbent polymer is preferably 60 g / m ² or more, more preferably 100 g / m ² or more, and preferably 500 g / m ² or less, more preferably 400 g / m ² or less. be.
In the absorbent sheet, as the water-absorbent polymer, the same polymer as that usually used in this kind of absorbent article can be used as in the pulp layer. The water-absorbent polymer is typically composed mainly of a polymer or copolymer of acrylic acid or an alkali metal salt of acrylic acid. Examples thereof include polyacrylic acid and salts thereof, and polymethacrylic acid and salts thereof, and specific examples thereof include partial sodium salts of acrylic acid polymers.

In the present embodiment, as shown in FIG. 3, the upright portion 50 includes the absorbent sheet, and more specifically, the absorbent core 6 constituting the upright portion 50 is the absorbent sheet.
In the present embodiment, the convex portion 31 of the surface sheet 3 is only two types of

convex portions

31A and 31B having different protrusion heights or areas, and the convex portion 31 (small convex) arranged in the concave-convex region 30A. All of the portions 31A) have a smaller protruding height or area than the convex portions 31 (large convex portions 31B) arranged in the uneven region 30B.
With such a configuration, the features of the absorbent sheet can be fully utilized, and the predetermined effect of the present invention (the effect of improving the absorption performance of body fluid and the leakproof property) can be more reliably achieved.

7 and 8 show diapers 1A as another embodiment of the absorbent article of the present invention. Regarding other embodiments described later, components different from the diaper 1 of the above-described embodiment will be mainly described, and similar components will be designated by the same reference numerals and description thereof will be omitted. The description of the diaper 1 is appropriately applied to the configurations not particularly described in other embodiments described later.

In the diaper 1A, as shown in FIGS. 7 and 8, the non-standing portion 51 has a two-layer structure. More specifically, the absorbent cores 6 constituting the non-upright portion 51 are located on the skin facing surface side (front surface sheet 3 side) and on the non-skin facing surface side (back surface sheet 4 side). It has a laminated structure with the second core 61 located. In the diaper 1A, the first core 60 is a pulp layer containing pulp, and the second core 61 is an absorbent sheet. As the pulp layer and the absorbent sheet in the diaper 1A, the same ones as described above can be used, respectively. The first core 60 (pulp layer) may contain a water-absorbent polymer.
According to the diaper 1A, since the non-standing portion 51 has the characteristic two-layer structure described above, the absorption rate of the liquid in the non-standing portion 51 is improved, and the diffusion of the liquid in the thickness direction is suppressed. Therefore, the dry feeling of the uneven region 30B covering the skin-facing surface of the non-standing portion 51 is improved, and lateral leakage can be prevented more reliably.

In the form shown in FIG. 7, the first core 60 is arranged only in the inseam B, but may be arranged in the ventral side A and / or the dorsal side C. The first core 60 and the second core 61 may be joined by a joining means such as an adhesive.
In the diaper 1A, the basis weight of the first core 60 is preferably 100 g / m ² or more, more preferably 200 g / m ² or more, and preferably 1200 g / m ² or less, more preferably 1000 g / m ² or less. .. When the first core 60 contains a material other than pulp (for example, a water-absorbing polymer), the basis weight of the first core 60 referred to here is the entire first core 60 including the other material. It means the basis weight.

In the form shown in FIG. 7, the first core 60 (pulp layer) has a low basis weight portion 65 that penetrates the first core 60 in the thickness direction and extends in the vertical direction X. The low basis weight portion 65 is a groove having no bottom, and is typically a region in which an absorber forming material such as pulp does not exist. However, there may be a case where the absorber forming material is present in the low basis weight portion 65 because the absorber forming material that has fallen off from the peripheral portion enters the low basis weight portion 65. In such a case, the basis weight of the absorber forming material in the low basis weight portion 65 is lower than that of the peripheral portion (for example, a region within 10 mm in the vertical direction X or the horizontal direction Y from the low basis weight portion 65), for example. It is preferably 20% or less, more preferably 10% or less, based on the basis weight of the peripheral portion. The low basis weight portion 65 can be formed according to a conventional method, and typically, when the pulp layer is produced using a known fiber stacking device, the fiber stacking of the material for forming the pulp layer is intentionally inhibited. Can be formed by

The low basis weight portion 65 contributes to the reduction of discomfort when wearing the diaper 1 and the improvement of liquid uptake and diffusivity. That is, the low basis weight portion 65 functions as a deformation guiding portion (flexible shaft) when the absorber 5 (first core 60) including the absorber 5 (first core 60) is deformed by being bent by receiving an external force such as body pressure. As a result, the absorber 5 is deformed along the body shape of the wearer, and as a result, the discomfort when wearing the diaper 1A can be reduced, and the wearing feeling and the fit can be improved. Further, the low basis weight portion 65 functions as a flow path for body fluid such as urine to be absorbed by the absorber 5 (first core 60), promotes diffusion of the body fluid in the surface direction, and has an absorption performance of the absorber 5. It can contribute to effective utilization. Since the low basis weight portion 65 plays such a role, it is preferable that the low basis weight portion 65 is arranged in a portion of the first core 60 that is easily affected by an external force such as body pressure and in which body fluid is easily concentrated. From such a viewpoint, it is preferable that the low basis weight portion 65 is arranged at a portion of the first core 60 located at the lower part B, as shown in FIG.

In the form shown in FIG. 7, a plurality of low basis weight portions 65 are intermittently arranged in the lateral direction Y on the inseam B. More specifically, the low basis weight portion 65 is formed symmetrically with reference to a horizontal center line (not shown) extending in the vertical direction X by bisecting the unfolded and stretched diaper 1 in the horizontal direction Y. , A pair is formed on both sides of the horizontal center line. Each of the pair of low basis weight portions 65 has a shape long in the vertical direction X in a plan view, specifically, a rectangular shape. The low basis weight portion 65 may extend from the lower crotch B to the ventral side A, or may extend from the lower crotch B to the dorsal side C.

In the diaper 1A, as shown in FIG. 8, in the projection view in the thickness direction of the first core 60 (pulp layer), in other words, in the plan view of the diaper 1A, the low basis weight portion 65 and the convex portion 31 (large portion 31). It overlaps with the convex portion 31B). As described above, the low basis weight portion 65 can promote the diffusion of the body fluid excreted by the wearer in the surface direction, but depending on the conditions, this liquid diffusion becomes excessive and the liquid absorption performance and the leakage prevention performance are achieved. However, there is concern that it will decline. On the other hand, in the diaper 1A, the convex portion 31 (large convex portion 31B) is formed by overlapping the low basis weight portion 65 and the convex portion 31 (large convex portion 31B) in the projection view in the thickness direction of the first core 60. Is receiving body fluids prior to the low basis weight section 65, thus dispelling such concerns.

In the present invention, the number of low basis weight portions 65 is not particularly limited, and may be one or three or more. Further, the plurality of low basis weight portions 65 may not be formed symmetrically with respect to the horizontal center line. Further, the plurality of low basis weight portions 65 may have different shapes and dimensions in a plan view. Further, in the form shown in FIG. 7, the length (width) of the low basis weight portion 65 in the lateral direction Y is constant over the entire length of the low basis weight portion 65 in the vertical direction X (longitudinal direction), but is constant. It does not have to be.

Further, in the present invention, as described above, the non-standing portion 51 may have a low basis weight portion in which the material for forming the absorber 5 (absorbent core 6) is smaller than that in the peripheral portion. When the non-standing portion 51 has a laminated structure of two or more layers, a low basis weight portion may be present in a part or all of the plurality of layers constituting the laminated structure.
For example, in the diaper 1A, the low basis weight portion 65 may be present in the second core 61 (absorbent sheet) instead of the first core 60 (pulp layer).
Alternatively, in the diaper 1A, the low basis weight portion 65 may be present in both the first core 60 and the second core 61. In that case, the low basis weight portion 65 of the first core 60 (pulp layer) and the low basis weight portion 65 of the second core 61 may overlap in a plan view. Further, in the overlapping portion between the low basis weight portion 65 of the first core 60 and the low basis weight portion 65 of the second core 61 in a plan view, the core wrap sheet 7 and the first core wrap sheet 7 covering the skin-facing surface of the first core 60 The core wrap sheet 7 that covers the non-skin facing surface of the two cores 61 may be joined by a joining means such as an adhesive or fusion.

Hereinafter, refer to FIGS. 9 and 10 for a preferred embodiment of the absorbent sheet, that is, a “sheet-like absorber comprising a fiber sheet facing each other and a water-absorbent polymer arranged between the fiber sheets”. I will explain. The above description of the absorbent sheet is appropriately applied to the structure of the absorbent sheet described later which is not particularly described.

As shown in FIG. 9, the absorbent sheet 9 comprises a first fiber sheet 91, a second fiber sheet 92, and a plurality of particles of the water-absorbing polymer 93 arranged between the

sheets

91 and 92. Be prepared. Both

sheets

91 and 92 are joined to each other by an adhesive 94. In the illustrated form, the adhesive 94 is arranged on the inner surface of each of the sheets 91 and 92 (the surface facing the water-absorbent polymer 93). The plurality of particles of the water-absorbent polymer 93 are arranged in a certain unit in the plane direction of the absorbent sheet 9, and form an arrangement region of the water-absorbent polymer 93.

In the arrangement region of the water-absorbent polymer 93 in the absorbent sheet 9, the water-absorbent polymer 93 is arranged in such a manner that no gap that can be visually recognized macroscopically is observed. Here, "no gap that can be visually recognized macroscopically" means that when the absorbent sheet 9 is viewed in plan from one surface side with the naked eye, the water-absorbent polymer 93 evenly covers the one surface. Although there is a region arranged in such a manner, it is permissible that a gap between the water-absorbing polymers 93 is unintentionally formed when the region is viewed microscopically. This void is about 10 to 1000 μm. In the following description, the voids between the water-absorbent polymers 93 that are microscopically observed in the arrangement region of the water-absorbent polymer 93 are also referred to as “microscopic voids”.

In the arrangement region of the water-absorbent polymer 93, the first fiber sheet 91 and the second fiber sheet 92 are directly joined by the adhesive 94 without the intervention of the water-absorbent polymer 93 (hereinafter, simply referred to as this). It also has a "direct bonding site 95"). The direct junction 95 is formed in each of the above-mentioned microscopic voids. When the direct bonding portion 95 is viewed in cross section in the sheet thickness direction, the adhesive 94 becomes a columnar shape and both

sheets

91 and 92 are directly bonded to each other. Further, as shown in FIG. 10, a plurality of direct joining portions 95 are formed in a regular or irregular scattered spot shape when the absorbent sheet 9 is viewed in the sheet plane direction. Since the direct bonding portion 95 is formed, the water-absorbent polymer 93 can be sufficiently exhibited in liquid absorbency while being held at a predetermined position on the absorbent sheet 9. The direct bonding portion 95 can be formed, for example, by appropriately adjusting the basis weight and particle size of the water-absorbent polymer 93, or the coating amount and area of the adhesive 94.

As shown in FIGS. 9 and 10, in the absorbent sheet 9, in addition to the direct bonding portion 95, both

sheets

91 and 92 are further bonded to the site 96 by the adhesive 94 via the water-absorbent polymer 93 (hereinafter, hereinafter, This is also referred to as "indirect joint site 96"). In the indirect bonding portion 96, the coating portion of the adhesive 94 on the first fiber sheet 91, the presence portion of the water-absorbent polymer 93, and the coating portion of the adhesive 94 on the second fiber sheet 92 overlap in the thickness direction. There is. With such a configuration, the water-absorbent polymer 93 can be held at a predetermined position on the absorbent sheet 9, the unintended movement or uneven distribution of the water-absorbent polymer 93 can be further reduced, and the absorbent sheet can be further reduced. The liquid absorbency of 9 can be further enhanced.

As the adhesive 94, it is preferable to use an adhesive having flexibility that allows the water-absorbent polymer 93 to expand in accordance with the swelling change accompanying the liquid absorption. Examples of such raw materials include (co) polymers of vinyl monomers such as 2-ethylhexyl acrylate, butyl acrylate, ethyl acrylate, cyanoacrylate, vinyl acetate, and methyl methacrylate (ethylene vinyl acetate copolymer and the like). ) Etc., acrylic adhesive containing one or more, silicone-based adhesive containing polydimethylsiloxane polymer polymer, etc., and natural rubber-based adhesive containing natural rubber, polyisoprene, chloroprene, etc. Isoprene-based adhesive, styrene-butadiene copolymer (SBR), styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer (SBS), styrene-ethylene-butadiene-styrene block Examples thereof include rubber-based adhesives such as styrene-based adhesives containing one or more polymers (SEBS) and styrene-ethylene-propylene-styrene block copolymers (SEPS). These may be used individually by 1 type or in combination of 2 or more type. As shown in FIG. 9, when the adhesive 94 is arranged on the facing surface (inner surface) of each of the

sheets

91 and 92 with the water-absorbent polymer 93, the adhesive arranged on the first fiber sheet 91. The 94 and the adhesive 94 arranged on the second fiber sheet 92 may be the same type or different types.

Of these, both sheets 91 are excellent in flexibility and elasticity, and even after the water-absorbent polymer 93 is swollen, both

sheets

91 and 92 are maintained in a state of being directly bonded to each other, and contraction force is exhibited to develop both sheets 91. From the viewpoint of facilitating the retention of the water-absorbent polymer 93 between the and 92, it is preferable to use a rubber-based adhesive as the adhesive 94, and it is more preferable to use a styrene-based adhesive among the rubber-based adhesives.

The adhesive 94 is preferably a hot melt adhesive from the viewpoint of achieving both the flexibility of the adhesive and the adhesiveness to the sheet. Examples of the hot melt adhesive include the above-mentioned various adhesives, tackifiers such as petroleum resin and polyterpene resin, plasticizers such as paraffin oil, and, if necessary, phenol-based, amine-based, and phosphorus-based adhesives. It may contain an antioxidant such as a benzimidazole type.

According to the absorbent sheet 9 having the above structure, the adhesive 94 present at the direct bonding portion 95 provides an appropriate bonding force between the

fiber sheets

91 and 92 so that the water-absorbing polymer 93 does not move or fall off. When expressed, the water-absorbent polymer 93 can be carried at an appropriate position between the

fiber sheets

91 and 92. In addition, since the water-absorbent polymer 93 exhibits an appropriate bonding force that allows it to swell sufficiently, the liquid absorbability of the water-absorbent polymer 93 can be sufficiently exhibited. According to a preferred embodiment of the present invention, since the adhesive 94 has elasticity, the extension of the adhesive 94 existing at the direct bonding portion 95 due to the swelling of the water-absorbent polymer 93 and the accompanying adhesion thereof. The force balance with the contraction of the agent 94 is likely to occur, and the bonding force capable of both supporting the water-absorbent polymer 93 at an appropriate position and securing a space in which the water-absorbent polymer 93 can swell is efficiently developed. be able to. As a result, the liquid absorbency of the absorbent sheet 9 is further improved.

The adhesive 94 is preferably applied to the inner surface of each of the

sheets

91 and 92, that is, the surface facing the water-absorbent polymer 93. With such a configuration, the adhesives 94 applied to both the

sheets

91 and 92 are bonded to each other to efficiently form the direct bonding portion 95 on the absorbent sheet 9, and the water-absorbent polymer 93 is supported at an appropriate position. And the securing of a space in which the water-absorbent polymer 93 can swell can be achieved at the same time. In addition to this, since the adhesive 94 can easily exist in the gap between the fibers constituting both

sheets

91 and 92, peeling at the interface between both

sheets

91 and 92 and the adhesive 94 is unlikely to occur. There is also the advantage of becoming.

As shown in FIGS. 9 and 10, from the viewpoint of suppressing unintentional movement and falling off of the water-absorbent polymer 93 and further increasing the absorption rate of the liquid, the water-absorbent polymer 93 is combined with the second fiber sheet 92 in the first fiber sheet 91. The adhesive 94 is discontinuously applied to the joint region so as to have a non-coated portion, and the adhesive 94 has a gap in the entire area of the joint region of the second fiber sheet 92 with the first fiber sheet 91. It is preferable that the coating is continuously applied without any problem. Further, the liquid receiving surface on which the adhesive 94 does not exist in the first fiber sheet 91, that is, the outer surface of the absorbent sheet 9 on the first fiber sheet 91 side, is the surface where the absorbent sheet 9 and the liquid first come into contact with each other. It is also preferable to use it as a surface. The bonding region is a region in which the water-absorbent polymer 93 is arranged in such a manner that no gaps that can be visually recognized macroscopically are observed.
Examples of the form in which the adhesive 94 is applied discontinuously so as to have a non-applied portion in the first fiber sheet 91 include a spiral shape, a summit shape, an omega shape, a curtain shape, and a stripe shape. In the form shown in FIG. 10, the adhesive 94 applied to the first fiber sheet 91 has a spiral shape.

The thickness of the absorbent sheet 9 is preferably 0.3 mm or more, more preferably 0.6 mm or more, from the viewpoint of improving liquid absorption. Further, from the viewpoint of improving the usability of the user when the absorbent article containing the absorbent sheet 9 is used, the thickness of the absorbent sheet 9 is preferably 4 mm or less, more preferably 3 mm or less, still more preferably 2 mm or less. Is. The thickness of the absorbent sheet 9 described above is the thickness of the entire absorbent sheet measured under a pressure of 1.7 kPa.

The absorbent article of the present invention is not limited to the pants-type disposable diaper as in the above embodiment, and broadly includes articles used for absorbing body fluids (urine, menstrual blood, loose stool, sweat, etc.) discharged from the human body. Expandable disposable diapers equipped with so-called fastening tapes, sanitary napkins, sanitary shorts and the like are also included.

Although the present invention has been described above based on the embodiment, the present invention can be appropriately modified without being limited to the embodiment.
For example, the surface sheet according to the present invention does not have to have a laminated structure of a plurality of sheets as in the surface sheet 3A shown in FIG. 5, but may have a single-layer structure.
Further, in the diaper 1 of the above-described embodiment, the exterior body 10 is in a form in which the exterior body 10 extends continuously from the ventral side portion A to the dorsal side portion C. A member constituting the (front body) and a member constituting the dorsal side C (rear body) may be independently provided, and the absorbent main body 2 may be bridged and fixed to both members.
All the parts of only one embodiment described above can be mutually used as appropriate. The following additional notes will be further disclosed with respect to the above-described embodiments of the present invention.

<1>
It has a vertical direction extending from the ventral side of the wearer to the dorsal side via the crotch portion and a lateral direction orthogonal to the vertical direction, and the crotch portion arranged in the crotch portion and the wearer's lower crotch portion. An absorber that is divided into a ventral portion arranged on the ventral side and a dorsal portion arranged on the dorsal side of the wearer rather than the crotch portion, and extends in the vertical direction through the crotch portion, and the absorption. An absorbent article comprising a surface sheet arranged on the side facing the skin of the body.
The absorber is located on both sides of the absorber at least in the inseam with the lateral central portion of the absorber in between, and a pair of upright portions that stand up toward the wearer's skin side when worn, and the central portion. Has a non-standing part located in
The surface sheet traverses the skin-facing surface side of the pair of upright portions and the non-upright portion in the lateral direction, and the extending portion from the pair of upright portions on the surface sheet is a non-absorbent. It is wrapped around the side facing the skin,
The portion of the surface sheet that covers the pair of upright portions and the non-upright portion facing the skin includes a plurality of convex portions protruding toward the skin side of the wearer and concave portions located around the convex portions. Concavo-convex areas are formed
The convex portion includes a plurality of types of convex portions having different protrusion heights or areas, and the concave-convex region of the upright portion has a protruding height or area of the convex portion as compared with the uneven region of the non-upright portion. Small, absorbent article.
<2>
The uneven region of the upright portion and the uneven region of the non-upright portion have the same number of convex portions per unit area, or the uneven region of the upright portion has more uneven regions, according to the above <1>. Absorbent article.
<3>
Assuming that the former ≥ the latter, the ratio of the number of the convex portions per unit area in the concave-convex region of the upright portion to that in the uneven region of the non-upright portion is preferably 1 or more, more preferably 1 or more. The absorbent article according to <2> above, which is 2 or more, preferably 10 or less, and more preferably 5 or less.
<4>
Assuming that the number of convex portions per unit area in the concave-convex region of the upright portion is larger than the number of convex portions per unit area in the uneven region of the non-standing portion, preferably 25 pieces / 1000 mm ^2. The absorbent article according to <2> or <3> above, more preferably 50 pieces / 1000 mm ² or more, preferably 175 pieces / 1000 mm ² or less, and more preferably 150 pieces / 1000 mm ^{2 or less.}
<5>
Assuming that the number of the convex portions in the uneven region of the non-standing portion per unit area is smaller than the number of the convex portions in the concave-convex region of the upright portion per unit area, preferably 10 pieces / 1000 mm ^2. The above, more preferably 25 pieces / 1000 mm ² or more, preferably 75 pieces / 1000 mm ² or less, more preferably 50 pieces / 1000 mm ² or less, according to any one of <2> to <4>. Absorbent article.

<6>
The absorbent article according to any one of <1> to <5>, wherein the uneven region of the upright portion has a larger microcompression value than the uneven region of the non-upright portion.
<7>
The ratio of the micro-compression value of the concavo-convex region of the upright portion to the micro-compression value of the concavo-convex region of the non-standing portion is preferably 1.1 or more, more preferably 1 as the former / the latter, assuming the former> the latter. The absorbent article according to <6> above, which is .5 or more, preferably 10 or less, and more preferably 5 or less.
<8>
Assuming that the micro-compression value of the concavo-convex region of the upright portion is larger than the micro-compression value of the concavo-convex region of the non-standing portion, it is preferably 4 (gf / cm ² ) / mm or more, more preferably 5 (gf). / Cm ² ) / mm or more, preferably 15 (gf / cm ² ) / mm or less, more preferably 10 (gf / cm ² ) / mm or less, according to the above <6> or <7>. Absorbent article <9>
Assuming that the micro-compression value of the uneven region of the non-standing portion is smaller than the micro-compression value of the concave-convex region of the upright portion, it is preferably 0.5 (gf / cm ² ) / mm or more, more preferably 1. (Gf / cm ² ) / mm or more, preferably 10 (gf / cm ² ) / mm or less, more preferably 8 (gf / cm ² ) / mm or less, according to the above <6> to <8>. The absorbent article according to any one item.

<10>
In the surface sheet, the boundary line between the large convex portion having a relatively large protruding height or area and the small convex portion having a relatively small protruding height or area extends in the vertical direction.
The absorbent article according to any one of <1> to <9>, wherein the standing starting point of the standing portion exists at a position where the standing starting point overlaps the boundary line in the thickness direction of the absorber.
<11>
By partially joining the other member to the non-skin facing surface of the absorber, a joint portion and a non-joint portion of both are formed between the absorber and the other member.
The absorbent article according to <10>, wherein the standing starting point of the standing portion is a boundary between the joint portion and the non-joining portion and is located on the boundary line.
<12>
The absorbent article according to any one of <1> to <11>, wherein the convex portions are arranged in a staggered pattern in the uneven region of the non-standing portion.
<13>
The absorbent article according to any one of <1> to <12>, wherein the non-standing portion has a low basis weight portion in which the material for forming the absorber is smaller than that in the peripheral portion.
<14>
The lateral outer end of the upright portion does not contain a water-absorbing polymer, and the portion of the surface sheet that covers the outer end has no irregularities on the surface. The absorbent article according to any one of 13>.
<15>
The absorbent article according to <14>, wherein the portion of the surface sheet that covers the laterally outer end of the upright portion has a single-layer structure.

<16>
The item according to any one of <1> to <15>, wherein the absorber includes an absorbent sheet comprising a fiber sheet facing each other and a water-absorbing polymer arranged between the fiber sheets. Absorbent article.
<17>
The absorbent article according to <16>, wherein the upright portion includes the absorbent sheet.
<18>
The non-standing portion has a two-layer structure, the skin-facing surface side of the two-layer structure is a pulp layer containing pulp, and the non-skin facing surface side of the two-layer structure is the absorbent sheet. Or the absorbent article according to <17>.
<19>
The pulp layer has a low basis weight portion that penetrates the pulp layer in the thickness direction and extends in the vertical direction, and the low basis weight portion and the convex portion are projected in the thickness direction of the pulp layer. The absorbent article according to <18> above, wherein
<20>
The low basis weight portion is present in both the pulp layer and the absorbent sheet.
The absorbent article according to <19>, wherein the low basis weight portion of the pulp layer and the low basis weight portion of the absorbent sheet overlap in a plan view.

<21>
In the arrangement region of the water-absorbent polymer in the absorbent sheet, the water-absorbent polymer is arranged in such a manner that no gap that can be visually recognized macroscopically is observed.
The item according to any one of <16> to <20>, wherein there is a portion where both fiber sheets are directly bonded by an adhesive without interposing the water-absorbent polymer in the arrangement region of the water-absorbent polymer. Absorbent article.
<22>
The absorbent sheet includes a portion where both fiber sheets are directly bonded by an adhesive without using the water-absorbent polymer, and a portion where both fiber sheets are bonded by an adhesive via the water-absorbent polymer. The absorbent article according to <21>.
<23>
The absorbent article according to <21> or <22>, wherein the adhesive is a styrene-based adhesive.
<24>
The absorbent article according to any one of <21> to <23>, wherein the adhesive is a hot melt adhesive.
<25>
The thickness of the absorbent sheet measured under a pressure of 1.7 kPa is preferably 0.3 mm or more, more preferably 0.6 mm or more, and preferably 4 mm or less, more preferably 3 mm or less. The absorbent article according to any one of <16> to <24>, which is more preferably 2 mm or less.

<26>
The item according to any one of <1> to <25>, wherein the plurality of types of convex portions include two types of convex portions (large convex portion and small convex portion) having different protrusion heights and areas. Absorbent article.
<27>
In the above two types of convex portions, the protrusion height of the convex portion (small convex portion) having a relatively small protrusion height and area and the protrusion height of the convex portion (large convex portion) having both relatively large protrusion heights. Assuming that the ratio is the former (small convex portion) <the latter (large convex portion), the former (small convex portion) / latter (large convex portion) is preferably 0.5 or more, more preferably 0.65 or more. The absorbent article according to <26>, which is preferably 0.95 or less, more preferably 0.90 or less.
<28>
Of the two types of protrusions, the protrusion height of the convex portion (small convex portion) having a relatively small protrusion height and area is the protrusion of the convex portion (large convex portion) having both relatively large protrusion heights (large convex portion). The above <26> or <27>, which is preferably 0.3 mm or more, more preferably 0.6 mm or more, and preferably 4 mm or less, more preferably 3 mm or less, assuming that the height is smaller than the height. Absorbent article.
<29>
Of the two types of protrusions, the protrusion height of the convex portion (large convex portion) having a relatively large protrusion height and area is the protrusion of the convex portion (small convex portion) having both relatively small protrusion heights (small convex portion). Any one of <26> to <28>, preferably 0.5 mm or more, more preferably 1 mm or more, and preferably 5 mm or less, more preferably 4 mm or less on the premise that the height is larger than the height. Absorbent article described in.
<30>
In the above two types of convex portions, the ratio of the area of the convex portion (small convex portion) having a relatively small protrusion height and the area to the area of the convex portion (large convex portion) having both relatively large protrusion heights and the area is Assuming the former (small convex part) <the latter (large convex part), the former (small convex part) / latter (large convex part) is preferably 0.1 or more, more preferably 0.15 or more, and The absorbent article according to any one of <26> to <29>, preferably 0.9 or less, more preferably 0.8 or less.
<31>
Of the two types of convex portions, the area of the convex portion (small convex portion) having a relatively small protrusion height and area is larger than the area of the convex portion (large convex portion) having both relatively large protrusion heights and areas. Assuming that it is small, it is preferably 1 mm ² or more, more preferably 2 mm ² or more, and preferably 15 mm ² or less, more preferably 10 mm ² or less, in any one of the above <26> to <30>. The absorbent article described.
<32>
Of the two types of convex portions, the area of the convex portion (large convex portion) having a relatively large protrusion height and area is larger than the area of the convex portion (small convex portion) having both relatively small protrusion heights and areas. Assuming that it is large, it is preferably 5 mm ² or more, more preferably 10 mm ² or more, and preferably 30 mm ² or less, more preferably 25 mm ² or less, in any one of the above <26> to <31>. The absorbent article described.

<33>
A pair of leak-proof cuffs were provided on both sides of the absorber along the vertical direction, and the leak-proof cuff was configured to include a leak-proof cuff forming sheet, and the sheet was fixed to another member. It has a base end portion and an upright portion on which the sheet stands up on the wearer side.
The pair of extending portions of the surface sheet are fixed between the absorber and the leak-proof cuff forming sheet at the base end portion of the leak-proof cuff, respectively, <1>. The absorbent article according to any one of <32>.
<34>
The item according to any one of <1> to <33>, wherein side elastic members for erecting the upright portion are arranged on or near both side edges of the absorber along the vertical direction. Absorbent article.
<35>
The lateral length (width) of each of the pair of erecting portions is preferably 10% or more, more preferably 15% or more, and preferably 15% or more, based on the total length (total width) of the absorber in the lateral direction. The absorbent article according to any one of <1> to <34>, wherein is 45% or less, more preferably 40% or less.
<36>
The lateral length (width) of the non-standing portion is preferably 10% or more, more preferably 20% or more, and preferably 80% with respect to the total length (total width) of the absorber in the lateral direction. The absorbent article according to any one of <1> to <35> above, which is% or less, more preferably 70% or less.
<37>
The length (width) of each of the pair of standing portions in the lateral direction is preferably 10 mm or more, more preferably 20 mm or more, and preferably 60 mm or less, more preferably 50 mm or less. 36> The absorbent article according to any one item.
<38>
The length (width) of the non-standing portion in the lateral direction is preferably 20 mm or more, more preferably 40 mm or more, and preferably 150 mm or less, more preferably 130 mm or less. The absorbent article according to any one of the above items.

According to the present invention, an absorbent article having excellent absorption performance of excreted body fluid and less likely to cause leakage is provided.

Claims

It has a vertical direction extending from the ventral side of the wearer to the dorsal side via the crotch portion and a lateral direction orthogonal to the vertical direction, and the crotch portion arranged in the crotch portion and the wearer's lower part rather than the crotch portion. An absorber that is divided into a ventral portion arranged on the ventral side and a dorsal portion arranged on the dorsal side of the wearer rather than the crotch portion, and extends in the vertical direction through the crotch portion, and the absorption. An absorbent article comprising a surface sheet arranged on the side facing the skin of the body.
The absorber is located on both sides of the absorber at least in the inseam with the lateral central portion of the absorber in between, and a pair of upright portions that stand up toward the wearer's skin side when worn, and the central portion. Has a non-standing part located in
The surface sheet traverses the skin-facing surface side of the pair of upright portions and the non-upright portion in the lateral direction, and the extending portion from the pair of upright portions on the surface sheet is a non-absorbent. It is wrapped around the side facing the skin,
The portion of the surface sheet that covers the pair of upright portions and the non-upright portion facing the skin includes a plurality of convex portions protruding toward the skin side of the wearer and concave portions located around the convex portions. Concavo-convex areas are formed
The convex portion includes a plurality of types of convex portions having different protrusion heights or areas, and the concave-convex region of the upright portion has a protruding height or area of the convex portion as compared with the uneven region of the non-upright portion. Small, absorbent article.
The uneven region of the upright portion and the uneven region of the non-upright portion have the same number of convex portions per unit area, or the uneven region of the upright portion has more uneven regions, according to claim 1. Absorbent article.
The absorbent article according to claim 1 or 2, wherein the uneven region of the upright portion has a larger microcompression value than the uneven region of the non-upright portion.
In the surface sheet, the boundary line between the large convex portion having a relatively large protruding height or area and the small convex portion having a relatively small protruding height or area extends in the vertical direction.
The absorbent article according to any one of claims 1 to 3, wherein the standing starting point of the standing portion exists at a position where the boundary line overlaps with the thickness direction of the absorber.
The absorbent article according to any one of claims 1 to 4, wherein the convex portions are arranged in a staggered pattern in the uneven region of the non-standing portion.
The absorbent article according to any one of claims 1 to 5, wherein the non-standing portion has a low basis weight portion in which the material for forming the absorber is smaller than that of the peripheral portion.
The outer end portion of the upright portion in the lateral direction does not contain a water-absorbing polymer, and the portion of the surface sheet covering the outer end portion has no unevenness on the surface, according to claims 1 to 6. The absorbent article according to any one item.
The absorbent article according to any one of claims 1 to 7, wherein the absorbent body comprises an absorbent sheet comprising a fiber sheet facing each other and a water-absorbing polymer arranged between the fiber sheets. ..
The absorbent article according to claim 8, wherein the upright portion includes the absorbent sheet.
8. The non-standing portion has a two-layer structure, the skin-facing surface side of the two-layer structure is a pulp layer containing pulp, and the non-skin-facing surface side of the two-layer structure is the absorbent sheet. 9. The absorbent article according to 9.
The pulp layer has a low basis weight portion that penetrates the pulp layer in the thickness direction and extends in the vertical direction, and the low basis weight portion and the convex portion are projected in the thickness direction of the pulp layer. The absorbent article according to claim 10, wherein the products are overlapped with each other.
In the arrangement region of the water-absorbent polymer in the absorbent sheet, the water-absorbent polymer is arranged in such a manner that no gap that can be visually recognized macroscopically is observed.
The absorbent article according to any one of claims 8 to 11, wherein there is a portion where both fiber sheets are directly bonded by an adhesive without interposing the water-absorbent polymer in the arrangement region of the water-absorbent polymer. ..
The absorbent sheet includes a portion where both fiber sheets are directly bonded by an adhesive without using the water-absorbent polymer, and a portion where both fiber sheets are bonded by an adhesive via the water-absorbent polymer. The absorbent article according to claim 12.
The absorbent article according to claim 12 or 13, wherein the adhesive is a styrene-based adhesive.
The absorbent article according to any one of claims 12 to 14, wherein the adhesive is a hot melt adhesive.
The absorbent article according to any one of claims 8 to 15, wherein the absorbent sheet has a thickness of 0.3 mm or more and 4 mm or less measured under a pressure of 1.7 kPa.