CN114206285B

CN114206285B - Absorbent article

Info

Publication number: CN114206285B
Application number: CN202080054971.8A
Authority: CN
Inventors: 梶原顺; 川口宏子
Original assignee: Kao Corp
Current assignee: Kao Corp
Priority date: 2019-08-26
Filing date: 2020-08-19
Publication date: 2023-03-24
Anticipated expiration: 2040-08-19
Also published as: JP2021029684A; JP7289242B2; CN114206285A; WO2021039513A1

Abstract

A laminated structure (20) of the present invention comprises: a first layer (21) disposed at a position relatively close to the skin of the wearer; a third layer (23) disposed at a position relatively distant from the skin of the wearer; and a second layer (22) disposed between the two layers (21, 23). The first layer (21) and the third layer (23) have depressions (21 a, 23 a) on the skin-facing surface. A space corresponding to the recessed portion (23 a) of the third layer (23) is present between the second layer (22) and the third layer (23). The second layer (22) or the third layer (23) contains an antibacterial agent (24). The recessed part (21 a) of the first layer (21) and the recessed part (23 a) of the third layer (23) are located at positions overlapping with an antibacterial agent arrangement region in which the antibacterial agent (24) is arranged in a plan view.

Description

Absorbent article

Technical Field

The present invention relates to an absorbent article containing an antibacterial agent.

Background

An absorbent article such as a disposable diaper typically includes: an absorbent body for absorbing and retaining excrement such as urine; a topsheet disposed closer to the skin of the wearer than the absorber; and a back sheet disposed on a side of the absorbent member away from the skin of the wearer, wherein the absorbent member includes an absorbent core mainly made of an absorbent material such as a fiber material or a water-absorbent polymer, and a core sheet covering an outer surface of the absorbent core.

Conventionally, in order to suppress the growth of bacteria derived from excrement during wearing of an absorbent article, a treatment of mixing an antibacterial agent with the absorbent article has been performed. For example, patent document 1 describes an absorbent article having a functional material region in which a functional material containing an antimicrobial agent is disposed between an absorbent body and a topsheet, and a compressed portion in which the functional material region and a layer adjacent thereto in the thickness direction are compressed in the thickness direction. In the compression section, the topsheet, the core sheet constituting the absorbent body, and the absorbent core are integrally recessed toward the backsheet, and the members located in the compression section are in close contact with each other without a gap.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2016-67749

Disclosure of Invention

Technical problem to be solved by the invention

The present invention provides an absorbent article having a layered structure for absorbing and retaining body fluid excreted by a wearer. The laminated structure has: a first layer disposed relatively close to the skin of the wearer; a third layer disposed at a position relatively distant from the skin of the wearer; and a second layer disposed between the first layer and the third layer. The first layer and the third layer each have a recessed portion on a skin-facing surface. A space corresponding to the recess of the third layer exists between the second layer and the third layer. The second layer or the third layer contains an antimicrobial agent. The recessed portion of the first layer and the recessed portion of the third layer are present at positions overlapping with an antimicrobial agent placement region where the antimicrobial agent is placed in a plan view.

Drawings

Fig. 1 is a developed plan view schematically showing a skin-facing surface side (inner surface side) in a developed and extended state of an unfolded disposable diaper as one embodiment of an absorbent article of the present invention.

Fig. 2 is a cross-sectional view schematically showing a section I-I of fig. 1.

Fig. 3 is a cross-sectional view schematically showing a part of the laminated structure shown in fig. 2 in an enlarged manner.

Fig. 4 corresponds to fig. 3, and shows another embodiment of the laminated structure of the present invention.

Fig. 5 corresponds to fig. 3, and shows a laminated structure according to still another embodiment of the present invention.

Fig. 6 corresponds to fig. 3, which is a further embodiment of the laminated structure of the present invention.

Fig. 7 corresponds to fig. 3, and shows a laminated structure according to still another embodiment of the present invention.

Detailed Description

When an absorbent article is mixed with an antimicrobial agent, the antimicrobial agent is usually incorporated into a member (for example, a topsheet) disposed closer to the skin of the wearer than the absorbent body. In this way, when excrement such as urine passes through the member mixed with the antimicrobial agent in the thickness direction thereof, the antimicrobial agent is precipitated together with the excrement, and the precipitate is absorbed and held by the absorbent body, thereby exhibiting a predetermined antimicrobial effect. However, when the antibacterial agent is mixed only in a member such as a topsheet, since the time for which the precipitate containing the antibacterial agent passes through the member in the thickness direction is usually very short, the amount of the precipitate of the antibacterial agent accompanying the passage of the precipitate is small, and the antibacterial effect to a desired degree cannot be obtained.

The present invention relates to an absorbent article having excellent antibacterial properties.

The present invention will be described below based on preferred embodiments with reference to the accompanying drawings. In the following description of the drawings, the same or similar reference numerals are given to the same or similar parts. The drawings are basically schematic drawings, and the proportions of the dimensions and the like may differ from the actual proportions.

Fig. 1 and 2 show a disposable diaper 1 as an embodiment of the absorbent article of the present invention. The diaper 1 has a longitudinal direction X corresponding to the front-back direction of the wearer, i.e., the direction extending from the abdominal side to the back side via the crotch portion, and a transverse direction Y orthogonal thereto, and is divided into a front body F disposed on the abdominal side of the wearer when worn and a rear body R disposed on the back side of the wearer, with the longitudinal center (longitudinal center line CLx) as a boundary.

As shown in fig. 1, the diaper 1 is divided into a front body F disposed on the front side (ventral side) of the wearer and a rear body R disposed on the back side (rear side) of the wearer when worn, with the longitudinal center (longitudinal centerline CLx) as a boundary. The longitudinal centerline CLx is an imaginary straight line that bisects the diaper 1 in the longitudinal direction X and extends in the transverse direction Y in the unfolded and extended state as shown in fig. 1. The "developed and extended state" of the diaper 1 means a state in which the diaper 1 is brought into a developed state as shown in fig. 1, and the diaper 1 in the developed state is extended to a state in which the elastic members of the respective portions are extended to a designed size (the same size as a size when the diaper is extended to a flat shape in a state in which the influence of the elastic members is completely eliminated).

The diaper 1 has a stomach-side portion a disposed on the stomach side of the wearer, a crotch portion B disposed in the crotch portion, and a back-side portion C disposed on the back side. The stomach-side portion a is a part of the front body F, the back-side portion C is a part of the back body R, and the crotch portion B is located at a position reaching the front body F and the back body R across the longitudinal center line CLx in the longitudinal direction X. The crotch portion B includes a excretory part facing portion (not shown) disposed to face an excretory part such as a penis of a wearer when worn. The diaper 1 is a so-called open-type disposable diaper, and as shown in fig. 1, fastening members 14 having fastening portions 13 are provided on both side edge portions of the back side portion C of the diaper 1 in the longitudinal direction X, and fastening regions 15 in which the fastening portions 13 can be fastened are provided on the non-skin-facing surface of the stomach side portion a.

The diaper 1 has: an absorbent main body 2 having an absorber 5 that absorbs and holds body fluid such as urine excreted by a wearer of the diaper 1; and a wing part 6 extending outward from the periphery of the absorbent main body 2.

The absorbent body 2 of the present embodiment includes: a liquid-permeable topsheet 3 forming a skin-facing surface; a back sheet 4 having liquid impermeability, or water repellency, which is formed on the non-skin-facing surface; and a liquid-retentive absorbent body 5 disposed between the two

sheets

3 and 4, and integrally formed by a known joining means such as an adhesive. As shown in fig. 1, the absorbent main body 2 has a rectangular shape in plan view, extends in the longitudinal direction X from the stomach-side portion a to the back-side portion C, and has a longitudinal direction that coincides with the longitudinal direction X. The absorbent body 5 is formed in an hourglass shape that narrows inward at a center portion in the longitudinal direction X of the crotch portion B in a plan view, and has a vertically long shape that is long in the longitudinal direction X.

In the present specification, the "skin-facing surface" is a surface of the absorbent article or a constituent member thereof (e.g., an absorbent body) that faces the skin side of the wearer when the absorbent article is worn, that is, a surface that is relatively close to the skin of the wearer, and the "non-skin-facing surface" is a surface of the absorbent article or a constituent member thereof that faces the side opposite to the skin side when the absorbent article is worn, that is, a surface that is relatively far from the skin of the wearer. The term "worn" as used herein means a state in which the absorbent article is maintained at a normal and proper wearing position, that is, a proper wearing position of the absorbent article.

The front sheet 3, the back sheet 4, and the absorbent body 5 are each made of a material that has been conventionally used in absorbent articles of this type, without any particular limitation. As the front sheet 3, various nonwoven fabrics and apertured films can be used, for example. As the back sheet 4, for example, a laminate of a resin film, and a nonwoven fabric can be used. The absorbent body 5 contains an absorbent material, and as the absorbent material, materials used as the material of the absorbent body in the absorbent article of this type can be used without particular limitation, and examples thereof include wood pulp, synthetic fibers after hydrophilization treatment, water-absorbent polymers, and the like. The form of the absorbent body 5 is not particularly limited as long as it contains an absorbent material, and may be, for example, a stacked body formed by stacking absorbent materials or a sheet-like absorbent structure containing an absorbent material.

The absorbent body 5 of the present embodiment includes, as shown in fig. 2, an absorbent core 50 containing an absorbent material, and a core sheet 51 covering the outer surface (skin-facing surface, non-skin-facing surface) of the absorbent core 50. The absorbent core 50 is typically a fiber-laminated body obtained by laminating an absorbent material. As the core sheet 51, for example, a liquid-permeable sheet such as paper, various nonwoven fabrics, and an apertured film can be used. The absorbent core 50 and the core-wrapped sheet 51 may be joined to each other by a known joining means such as a hot-melt adhesive.

The core-spun sheet 51 may be constituted by 1 sheet or a plurality of sheets. The core-wrapped sheet 51 made of 1 sheet, for example, has a width 2 times or more and 3 times or less the length in the transverse direction Y of the absorbent core 50, covers the entire region of the skin-facing surface of the absorbent core 50, extends outward in the transverse direction Y from both side edges of the absorbent core 50 in the longitudinal direction X, and is folded back toward the non-skin-facing surface side of the absorbent core 50, so that the entire region of the non-skin-facing surface of the absorbent core 50 can be covered. In the core sheet 51 constituted by 1 sheet as described above, a portion covering the skin-facing surface of the absorbent core 50 is a skin-side wrapping sheet 52, and a portion covering the non-skin-facing surface of the absorbent core 50 is a non-skin-side wrapping sheet 53. Further, the core-clad sheet 51 constituted by a plurality of sheets includes, for example: 1 skin-side wrapping sheet 52 covering the skin-facing surface of the absorbent core 50; and 1 non-skin-side wrapping sheet 53 which is separate from the sheet 52 and covers the non-skin-facing surface of the absorbent core 50.

The wing portions 6 are members extending outward from the periphery of the absorbent main body 2, and are non-arrangement portions of the absorbent body. In the present embodiment, as shown in fig. 2, the front sheet 3 covers the entire skin-facing surface region of the absorbent body 5, the back sheet 4 covers the entire non-skin-facing surface region of the absorbent body 5, and the two

sheets

3 and 4 further extend outward in the lateral direction Y from both side edges of the absorbent main body 2 in the longitudinal direction X, and together with a leakage prevention cuff forming sheet 70 described later, form a part of the wing portion 6 (both side edges of the absorbent main body 2 in the longitudinal direction X and a side flap portion extending outward in the lateral direction Y from an imaginary extension line of the both side edges). The plurality of members constituting the wing part 6 are joined to each other by a known joining method such as an adhesive, heat sealing, or ultrasonic sealing.

As shown in fig. 1 and 2, leakage preventing cuffs 7 that stand up toward the skin of the wearer when worn are arranged along both side portions of the absorbent main body 2 (the layered structure) in the longitudinal direction X. More specifically, a pair of

leakage preventing cuffs

7 and 7 including a liquid-resistant, water-repellent, and air-permeable leakage preventing cuff forming sheet 70 are disposed on both side portions of the skin-facing surface of the absorbent body 2 along the longitudinal direction X. The pair of leakage preventing

cuff forming sheets

70 and 70 are fixed at one end side in the lateral direction Y to another member (the front sheet 3 and the back sheet 4 in the illustrated embodiment) to form a fixed end portion, and at the other end side in the lateral direction Y, a free end portion which is not fixed to another member is fixed, and at the free end portion, a linear or belt-shaped leakage preventing cuff forming elastic member 71 is fixed in an extended state in the longitudinal direction X. When the diaper 1 is worn, the free end portion side of the leak-proof cuff-forming sheet 70 rises toward the wearer side with the fixing portion 72 of the other member as a rising base end at least in the crotch portion B due to the contractive force of the elastic member 71 for forming the leak-proof cuff, and the outflow of excrement such as urine to the outside in the lateral direction Y can be prevented by the rising of the leak-proof cuff 7.

In the wing portions 6 at the end portions in the longitudinal direction X of each of the front and back side portions a and C, that is, at the waist end portions, a plurality of linear or belt-like elastic members 11 for forming waist gathers are arranged in an extended state in the transverse direction Y, and these plurality of elastic members 11 are arranged at intervals in the longitudinal direction X. As described above, the elastic member 11 is disposed in a state where its stretchability is exhibited, and substantially continuous annular waistline gathers are formed over the entire circumference of the waist end portions of the abdomen-side portion a and the back-side portion C, which are the disposed portions. Further, in the wing portions 6, the leg gathers forming elastic members 12 in the state of being stretched in the longitudinal direction X extend in the longitudinal direction X at least over the entire length in the longitudinal direction X of the crotch portion B, and therefore, when the diaper 1 is worn, the leg gathers are formed in the leg portions by contraction of the elastic members 12. These

elastic members

11 and 12 for wrinkle formation are each sandwiched and fixed between a plurality of sheets constituting the wing portions 6 (2 of the front sheet 3, the back sheet 4, and the sheet 70 for leak-proof cuff formation in the present embodiment) by a joining method using an adhesive or the like.

As shown in fig. 1 and 2, the absorbent main body 2 has a layered structure 20 that absorbs and holds bodily fluids excreted by the wearer, that is, excretions. Fig. 3 shows a part of the laminated structure 20 in an enlarged manner. The laminated structure 20 includes: a first layer 21 disposed relatively close to the skin of the wearer; a third layer 23 disposed at a position relatively distant from the skin of the wearer; and a second layer 22 disposed between the first layer 21 and the third layer 23.

As shown in fig. 2, the absorbent body 2 of the present embodiment includes a topsheet 3, a skin-side wrapping sheet 52, and an absorbent core 50 in order from the near side to the far side of the skin of the wearer, the topsheet 3 being a first layer 21, the skin-side wrapping sheet 52 being a second layer 22, and the absorbent core 50 being a third layer 23. There are no other layers between the 3 layers, and the 3 layers are adjacent to and in contact with each other in the thickness direction.

The laminated structure 20 plays a role of absorbing and holding excrement, and is therefore preferably disposed at least in the excrement-facing portion, more specifically, at least in the center portion in the transverse direction Y of the crotch portion B. In the present embodiment, since the entire absorbent main body 2 is substantially the laminated structure 20, the disposition portion of the absorbent main body 2 is also substantially the disposition portion of the laminated structure 20, and the laminated structure 20 is disposed in the center portion in the lateral direction Y of the crotch portion B over the entire length in the longitudinal direction X of the crotch portion B.

As shown in fig. 3, the first layer 21 has a depression 21a on the skin-facing surface thereof, and the third layer 23 has a depression 23a on the skin-facing surface thereof. The recessed

portions

21a and 23a are recessed portions recessed from the skin-facing surface side to the non-skin-facing surface side, and are also referred to as recessed portions.

In the present embodiment, the recessed portion 23a of the third layer 23 is a through hole penetrating the third layer 23 in the thickness direction, and unlike this, the recessed portion 21a of the first layer 21 has a bottom portion instead of a through hole. That is, unlike the case where the material for forming the third layer 23 is not present in the recessed portion 23a of the third layer 23 and the grammage at the position where the recessed portion 23a is formed is zero, the material for forming the first layer 21 is present in the recessed portion 21a of the first layer 21 and the grammage at the position where the recessed portion 21a is formed is not zero. The depression of the present invention includes a through-type depression such as the depression 23a and a non-through-type depression having a bottom such as the depression 21a. The grammage of the formation position of the non-through type recessed portion may be larger, smaller, or equal to the grammage of the peripheral portion. Even when the grammage of the formation position of the non-through type recessed portion is equal to or greater than the grammage of the peripheral portion thereof, for example, when the recessed portion is a portion in which the formation position is compressed in the thickness direction, the recessed portion is recessed more than the peripheral portion.

The method for forming the recessed portion of the present invention is not particularly limited. As an example of a method of forming a non-penetrating type depressed portion such as the depressed portion 21a, there is a method of manufacturing a first layer 21 (front sheet 3) having a flat surface without a depressed portion, and performing compression processing such as embossing with or without heat at a predetermined portion of the first layer 21. The formation position of the recessed portion 21a formed by this method is compressed in the thickness direction, and therefore has a higher density than the peripheral portion. When the depressed portion 21a is formed as a through-type depressed portion, a material of a portion to be formed of the depressed portion 21a may be removed by punching, cutting, or the like instead of compression processing. In particular, another example of a method for forming the through-type or non-through-type depressions in the absorbent core 50 is a method in which the formation of the depressions in the intended portions is intentionally inhibited in the step of stacking absorbent materials such as wood pulp during the production of the absorbent core 50. The method of forming the depressed portion can be performed by a known conventional method of manufacturing an absorbent core, for example, a method of manufacturing the absorbent core 50 by sucking and depositing a core forming material supplied with an air flow onto a forming die formed on the outer peripheral surface of a rotary drum, and the depressed portion can be formed by using a forming die having a predetermined pattern, for example, a forming die in which a portion corresponding to the depressed portion protrudes upward from the peripheral portion as the forming die.

In the present embodiment, the first layer 21 has a plurality of concave portions 21a on the skin-facing surface and a plurality of convex portions 21b protruding toward the skin of the wearer. That is, the first layer 21 of the present embodiment has a concavo-convex structure including a plurality of concave portions 21a, that is, concave portions, and a plurality of convex portions 21b on the skin-facing surface.

The pattern of the uneven structure in the first layer 21, that is, the shape and arrangement of each of the recessed portion 21a and the projecting portion 21b are not particularly limited, and various patterns can be employed without departing from the scope of the present invention. As a typical pattern of the uneven structure of the first layer 21, as shown in fig. 3, a pattern in which recessed portions 21a and raised portions 21b are alternately arranged in the lateral direction Y can be exemplified. As an example of the pattern of the uneven structure of the first layer 21, a pattern in which a plurality of concave portions 21a are arranged in a scattered manner on the skin-facing surface and each concave portion 21a is surrounded by a plurality of convex portions 21b can be given. Another example of the pattern of the uneven structure of the first layer 21 is a pattern in which recessed portions 21a extending in the longitudinal direction X and raised portions 21b extending in the longitudinal direction X are alternately arranged in the lateral direction Y. The shapes of the recessed portion 21a and the projecting portion 21b in plan view are not particularly limited, and for example, a circle, an ellipse, a triangle, a quadrangle, a polygon having five or more sides, a straight line, a curved line, or the like can be used.

The recessed portion 23a of the present embodiment has a rectangular shape in plan view as shown in fig. 1, and the longitudinal direction thereof coincides with the longitudinal direction X. In the present embodiment, a plurality of (3 in the illustrated embodiment) recessed portions 23a extending in the longitudinal direction X are arranged at intervals in the lateral direction Y in the crotch portion B. The pattern of the recessed portions 23a in the third layer 23, that is, the shape and arrangement of the recessed portions 23a are not particularly limited, and various patterns can be employed without departing from the spirit of the present invention.

As shown in fig. 3, a space corresponding to the recess 23a of the third layer 23 exists between the second layer 22 and the third layer 23. There is no other layer between the second layer 22 and the third layer 23, and since the non-skin-facing surface of the second layer 22 is in contact with and adjacent to the skin-facing surface of the third layer 23, the recessed portion 23a present on the skin-facing surface of the third layer 23 itself becomes a space (gap) present between the two

layers

22, 23. Thus, the number of spaces existing between the second layer 22 and the third layer 23 is generally the same as the number of the recesses 23a of the third layer 23. In the present embodiment, as shown in fig. 2, since the number of the recessed portions 23a of the third layer 23 is 3, there are 3 spaces between the second layer 22 and the third layer 23, which correspond to the 3 recessed portions 23a one-to-one.

As shown in fig. 3, an antibacterial agent 24 is disposed in the laminated structure 20. One of the main features of the diaper 1 is that the second layer 22 or the third layer 23 contains the antimicrobial agent 24, and the recessed portions 21a of the first layer 21 and the recessed portions 23a of the third layer 23 are located at positions overlapping with the antimicrobial agent placement region where the antimicrobial agent 24 is placed, in a plan view, that is, a projection in the thickness direction of the laminated structure 20. The "antimicrobial agent-containing region" is a region in which the antimicrobial agent is contained at a higher density than the peripheral portion, and typically has a certain spread in a portion to which the antimicrobial agent or a composition containing the antimicrobial agent is attached by coating or spraying. In the present invention, 1 or 2 or more antimicrobial agent placement regions can be present in a plan view of 1 layer constituting the laminated structure 20.

In the present embodiment, as shown in fig. 3, the second layer 22 contains the antibacterial agent 24, and thus the antibacterial properties of the second layer 22 (skin-side wrapping sheet 52) are improved. In fig. 3, 1 of the 3 recessed portions 23a shown in fig. 2 is shown in an enlarged manner together with its vicinity, and the other 2 recessed portions 23a and their vicinity are configured in the same manner as in fig. 3.

Conventionally, in a laminate structure including a topsheet, a skin-side wrapping sheet, and an absorbent core, an antimicrobial agent is mixed in the topsheet and/or the skin-side wrapping sheet, and in order to obtain a predetermined antimicrobial effect, in the conventional technique, the antimicrobial agent mixed in the sheet must be deposited as bodily fluid such as urine passes through the topsheet and the skin-side wrapping sheet in the thickness direction. However, since the time for passing a body fluid such as urine through the topsheet or the skin-side cover sheet in the thickness direction is usually very short, the amount of deposition of the antibacterial agent accompanying the passage of the body fluid is small in the conventional art, and the antibacterial effect to a desired degree cannot be obtained in practice.

Therefore, in the present invention, in order to make the most of the antibacterial effect by the antibacterial agent, the body fluid can be temporarily stored in the predetermined portion of the laminated structure of the absorbent article, and the stored body fluid and the antibacterial agent placement region disposed in the predetermined portion of the laminated structure can be brought into contact with each other for a relatively long time, whereby the efficiency of the deposition of the antibacterial agent can be improved. Specifically, in the laminated structure 20, as described above, 1) the first layer 21 (topsheet 3) has the concave portion 21a on the skin-facing surface, and the third layer 23 (absorbent core 50) has the

concave portions

23a and 2 on the skin-facing surface, and a space corresponding to the concave portion 23a of the third layer 23 exists between the second layer 22 (skin-side wrapping sheet 52) and the third layer 23, and 3) the second layer 22 or the third layer 23 contains the antibacterial agent 24,4) the concave portion 21a of the first layer 21 and the concave portion 23a of the third layer 23 are located at positions overlapping with the antibacterial agent placement region where the antibacterial agent 24 is placed in a plan view. As for the above 3), in the present embodiment, as shown in fig. 3, the second layer 22 has an antibacterial agent 24. With the configuration of 1) above, since the first layer 21 and the third layer 23 have the recessed

portions

21a and 23a on the skin-facing surface, the liquid retentivity of the two

layers

21 and 23 is improved, and the time period in which the body fluid can be temporarily stored in the two

layers

21 and 23 becomes longer, as compared with the case where the two

layers

21 and 23 do not have recessed portions and the skin-facing surfaces thereof are flat, so that the time period for the antimicrobial agent 24 to precipitate can be obtained. By adopting the structures 2) to 4), the body fluid passing through the formation site of the recessed portion 21a in the first layer 21 and the second layer 22 can be temporarily stored in the space (gap) formed by the recessed portion 23a existing between the second layer 22 and the third layer 23, and the stored body fluid can be brought into contact with the antimicrobial agent 24 for a relatively long time. The diaper 1 is excellent in antibacterial properties because the antibacterial agent 24 can be sufficiently deposited from its initial arrangement position (antibacterial agent arrangement region) by the cooperation of the structures 1) to 4) described above, and can effectively suppress a trouble caused by the propagation of bacteria derived from excrement, for example, the occurrence of a problem on the skin of a wearer or the generation of an unpleasant odor when worn.

In particular, in the present embodiment, as described above, since the plurality of concave portions 21a (concave portions) and the plurality of convex portions 21b are respectively present on the skin-facing surface of the first layer 21 as shown in fig. 3, and the skin-facing surface has the uneven structure, the liquid retentivity is improved and the deposition of the antibacterial agent 24 can be further promoted as compared with the case where the skin-facing surface of the first layer 21 does not have such an uneven structure.

From the viewpoint of improving the liquid retainability of the first layer 21, the ratio of the total area of the recessed portions 21a to the area of the skin-facing surface of the first layer 21 is preferably 1% or more, more preferably 3% or more, and preferably 15% or less, more preferably 12% or less. By forming the area ratio of the concave portions 21a in the skin-facing surface of the first layer 21 in this range, the liquid retention of the first layer 21 is improved, and the liquid easily passes through the first layer 21.

The depression depth 23D (see fig. 3) of the depression 23a of the third layer 23 is preferably deeper than the depression depth 21D (see fig. 3) of the depression 21a of the first layer 21. In the laminated structure 20, since the antibacterial agent 24 is basically disposed on the side farther from the skin of the wearer than the first layer 21, in order to promote precipitation of the antibacterial agent 24 accompanying passage of bodily fluid, it is preferable that bodily fluid stay in the second layer 22 and/or the third layer 23 for as long as possible, and by establishing the size relationship of 23d >, 21d with respect to the depth of concavity, this preferable state can be stably formed.

The ratio of the depression depth 23D to the depression depth 21D is 23d >, 21d, and 23D/21D is preferably 3 or more, more preferably 10 or more, and preferably 200 or less, more preferably 150 or less.

The depression depth 23D of the depression 23a of the third layer 23 is preferably 0.05mm or more, more preferably 1mm or more, and preferably 10mm or less, more preferably 8mm or less.

The depression depth 21D of the depression 21a of the first layer 21 is preferably 0.05mm or more, more preferably 0.075mm or more, and preferably 1mm or less, more preferably 0.8mm or less.

The depression depth of the depressed portion of each layer (first layer 21, second layer 22, or third layer 23) constituting the laminated structure was measured by the following method.

< method for measuring depth of depression in depressed portion >

A sheet to be measured (a layer to be measured in a laminated structure) was taken out from an absorbent article, and the taken-out sheet was cut into a planar quadrangular shape having a length of 50mm in the longitudinal direction (longitudinal direction) and a length of 50mm in the transverse direction (width direction) of the absorbent article, to prepare cut pieces of the sheet. However, when a cut piece having such a size cannot be produced, a cut piece as large as possible is produced.

A magnified photograph of the cut surface of the cut piece was obtained with a microscope (VHX-1000, manufactured by KEYENCE CORPORATION) at a temperature of 20. + -. 2 ℃ and a relative humidity of 65. + -. 5%. The maximum depth of the depressions was regarded as the depression depth of the depression based on the enlarged photograph, and the depression depths of 3 depressions were measured. The average value of the 3 points was set as the depression depth of the depressed portion of the sheet to be measured.

In the third layer 23 (absorbent core 50 in the present embodiment), the grammage at the position where the depressed portion 23a is formed is preferably lower than the grammage at the peripheral portion thereof. The "peripheral portion of the recessed portion 23 a" herein refers to a non-recessed portion adjacent to the recessed portion 23a in the planar direction of the third layer 23, and typically is within 10mm in the planar direction from the recessed portion 23a. Since the recessed portion 23a of the present embodiment is a through-type recessed portion as described above and the grammage at the formation position thereof is zero, it is needless to say that the magnitude relationship "the grammage at the formation position of the recessed portion < the grammage at the peripheral portion of the recessed portion" is established. Even when the recessed portion 23a of the third layer 23 is a non-penetrating recessed portion like the recessed portion 21a of the first layer 21, such a magnitude relationship is preferably established. By establishing such a magnitude relationship, diffusion of the body fluid stored in the recessed portion 23a in the surface direction (direction orthogonal to the thickness direction) of the third layer 23 is suppressed, and therefore, the liquid retainability of the recessed portion 23a, which is the space between the second layer 22 and the third layer 23, is further improved, and precipitation of the antimicrobial agent 24 can be further promoted. In particular, as shown in the present embodiment, when the recessed portion 23a is a through-type recessed portion, diffusion of the body fluid stored in the recessed portion 23a is easily suppressed, which is preferable.

When the recessed portion 23a of the third layer 23 is a non-through recessed portion, the ratio of the grammage of the formation position of the non-through recessed portion 23a to the grammage of the peripheral portion thereof is preferably 0.08 or more, more preferably 0.1 or more, and preferably 0.8 or less, more preferably 0.6 or less, on the premise that the former/the latter is less than the former.

Non-penetrating type concaveThe gram weight of the recess 23a is preferably 50g/m ² Above, more preferably 100g/m ² Above, and preferably 500g/m ² Hereinafter, it is more preferably 400g/m ² The following.

The composition of the third layer 23 (the absorbent core 50 in the present embodiment) is not particularly limited, and preferably includes cellulose fibers and a water-absorbent polymer in view of improving the liquid retention of the third layer 23. As the cellulose fibers and the water-absorbent polymer, materials that can be used as a material for forming the absorbent body in the absorbent article can be used without particular limitation. Examples of the cellulose fibers include natural fibers such as wood pulp such as softwood pulp and hardwood pulp, and non-wood pulp such as cotton pulp and hemp pulp; modified pulp such as cationized pulp and mercerized pulp; regenerated fibers such as cuprammonium fibers and rayon fibers, and 1 of them can be used alone or 2 or more of them can be mixed and used. As the water-absorbent polymer, a particulate polymer is generally used, but a fibrous polymer may be used. When the particulate water-absorbent polymer is used, the shape thereof may be any of spherical, block, bag, or amorphous. The average particle diameter of the water-absorbent polymer is preferably 10 μm or more, more preferably 100 μm or more, and preferably 1000 μm or less, more preferably 800 μm or less. As water-absorbing polymers, it is generally possible to use polymers or copolymers of acrylic acid or alkali metal salts of acrylic acid. As examples thereof, polyacrylic acid and salts thereof and polymethacrylic acid and salts thereof can be cited.

The content of the cellulose fibers in the third layer 23 is preferably 20% by mass or more, more preferably 30% by mass or more, and preferably 80% by mass or less, more preferably 70% by mass or less, with respect to the entire mass of the third layer 23.

The content of the water-absorbent polymer in the third layer 23 is preferably 20 mass% or more, more preferably 30 mass% or more, and preferably 80 mass% or less, more preferably 70 mass% or less, with respect to the entire mass of the third layer 23.

From the viewpoint of improving the liquid retention of the third layer 23, the third layer 23 preferably has a lower liquid permeability than the second layer 22.

The second layer 22 preferably has lower liquid permeability than the first layer 21. In the laminated structure 20, since the antibacterial agent 24 is basically disposed on the side away from the skin of the wearer than the first layer 21, by setting the liquid permeability of the second layer 22 to be lower than the liquid permeability of the first layer 21, the body fluid can stay for a relatively long time in the antibacterial agent disposition region where the antibacterial agent 24 is disposed, and the deposition of the antibacterial agent 24 can be further promoted.

The Liquid permeability of each layer (first layer 21, second layer 22 or third layer 23) constituting the laminated structure 20 can be evaluated using "Liquid Strike-Through Time" as an index, which is measured using a penetration Time measuring apparatus Lister manufactured by Lenzing Technik. The Liquid spike-Through Time is a Time (seconds) required for a predetermined amount of physiological saline to pass from the front surface to the back surface (from the skin-facing surface to the non-skin-facing surface) of the measurement material (e.g., the first layer 21). The longer the Liquid spike-Through Time, the lower the Liquid permeability of the layer, and conversely, the shorter the Liquid permeability of the layer.

< method of measuring Liquid Strike-Through Time >

On the base of the measuring apparatus (Lister), 10 sheets of filter paper were stacked and the measuring material was placed thereon. At this time, the non-skin-facing surface of the measurement material (1 of the plurality of layers constituting the laminated structure 20) was directed toward the filter paper side, and the skin-facing surface of the measurement material was set to be the upper surface. Then, a penetration plate having an electrode was placed on the upper surface of the measurement material, 10mL of a physiological saline (Japanese pharmacopoeia physiological saline Otsuka Denshi (trade name)) was injected from a liquid inlet connected to the penetration plate, and then the power supply of the measurement device was turned on. From the state where the physiological saline was in contact with the electrode, the time (seconds) until the physiological saline passed through the measurement material and the potential dropped to be in non-contact with the electrode was calculated. 3 measurements were made, and the average value was taken as the Liquid spike-Through Time of the measurement material.

In the present embodiment, as shown in fig. 1 and 2, the leakage preventing cuffs 7 that stand up toward the skin of the wearer when worn are arranged along both side portions of the layered structure 20 (absorbent body 2) in the longitudinal direction X. The standing mode of the leakage-proof flanging 7 is as follows: as described above, when the diaper 1 is worn, the contraction force of the elastic member 71 for forming the leakage-preventing cuffs raises the free end portion side of the sheet 70 for forming the leakage-preventing cuffs toward the wearer side with the fixing portions 72 as the standing base ends at least in the crotch portion B. When the leak cuffs 7 that can stand up when worn are disposed on both sides of the laminate structure 20 in the transverse direction Y, wrinkles can be formed in at least 1 of the plurality of layers (the first layer 21, the second layer 22, and the third layer 23) constituting the laminate structure 20 due to the effect of the standing up of the leak cuffs 7 in the standing state of the leak cuffs 7. The wrinkles are generally formed on the outer surface (skin-facing surface, non-skin-facing surface) of the layer. In this way, since the wrinkles formed in the laminated structure 20 by the standing of the leakage prevention cuffs 7 can function as a portion capable of temporarily storing bodily fluids, the liquid retention property of the entire laminated structure 20 is improved, and the deposition time of the antibacterial agent 24 can be sufficiently obtained.

The uneven structure including the recessed portions 21a on the skin-facing surface of the first layer 21 does not need to be the structure originally provided in the first layer 21 (the topsheet 3 in the present embodiment), and may be, for example, wrinkles formed on the skin-facing surface of the first layer 21 in the standing state of the leakage prevention cuffs 7 as described above. That is, the skin-facing surface of the first layer 21 is a flat surface having no uneven structure when the diaper 1 is not worn, which is a state in which the leakage preventing cuffs 7 are not raised, and wrinkles are formed on the skin-facing surface of the first layer 21 when the diaper 1 is worn, which is a state in which the leakage preventing cuffs 7 are raised, and as a result, the recessed portions 21a may be formed on the skin-facing surface.

In the laminated structure 20, at least one of the second layer 22 and the third layer 23 may contain the antibacterial agent 24, and the first layer 21 may not contain the antibacterial agent 24, but when the first layer 21 contains the antibacterial agent 24, the antibacterial property can be further improved.

Fig. 4 to 7 show another embodiment of the laminated structure of the present invention. In another embodiment described later, components different from the laminated structure 20 are mainly described, and the same components are denoted by the same reference numerals and are not described again. The description of the laminated structure 20 can be applied to the components not specifically described.

In the laminated structure 20A shown in fig. 4, both the first layer 21 and the third layer 23 contain the antibacterial agent 24. In the laminated structure 20A, the first layer 21 is a skin-side wrapping sheet 52, the second layer 22 is an absorbent core 50, and the third layer 23 is a non-skin-side wrapping sheet 53. As described above, the skin-facing concave portion 21a (concave-convex structure) of the first layer 21 (skin-side wrapping sheet 52) and the skin-facing concave portion 23a (concave-convex structure) of the third layer 23 (non-skin-side wrapping sheet 53) may be structures that are originally provided in the

layers

21 and 23, that is, structures that are always present, or structures that are formed when the diaper 1 is worn, such as wrinkles formed in the standing state of the leakage-preventing cuffs 7. In the laminated structure 20A, the first layer 21 may not contain the antibacterial agent 24.

In the laminated structure 20A, as shown in fig. 4, the second layer 22 (absorbent core 50) has a depression 22a on the skin-facing surface. As described above, the recessed portions 22a are formed not only in the first layer 21 and the third layer 23 but also in the skin-facing surface of the second layer 22, whereby the liquid retention property of the laminated structure 20A is further improved, and the deposition of the antibacterial agent 24 can be further promoted. In the embodiment shown in fig. 4, the recessed portion 22a is a through-hole (through-type recessed portion) penetrating the second layer 22 in the thickness direction, and may be a non-through-type recessed portion such as the recessed

portions

21a and 23a.

The recess depth 22D (see fig. 4) of the recess 22a of the second layer 22 is preferably deeper than the recess depth 21D (see fig. 4) of the recess 21a of the first layer 21. The reason for this is the same as the reason why the above-described magnitude relationship of "the depression depth 23D of the depression 23a of the third layer 23> the depression depth 21D of the depression 21a of the first layer 21" is preferable.

The ratio of the depression depth 22D to the depression depth 21D is preferably 3 or more, more preferably 10 or more, and preferably 200 or less, more preferably 150 or less, on the premise of 22d >, 21d.

The depression depth 22D of the depression 22a of the second layer 22 is preferably 0.05mm or more, more preferably 1mm or more, and preferably 10mm or less, more preferably 8mm or less.

In addition, as shown in the laminated structure 20A, when the second layer 22 has the recessed portion 22a on the skin-facing surface, the recessed depth 22D of the recessed portion 22a of the second layer 22 may be the same as or different from the recessed depth 23D of the recessed portion 23a of the third layer 23. 22d > <23d in the embodiment shown in fig. 4.

On the other hand, if 22d 23d, that is, if the depression depth 23D of the depressions 23a of the third layer 23 is deeper than the depression depth 22D of the depressions 22a of the second layer 22, in the layer in which body fluid is most likely to accumulate in the laminated structure, that is, the third layer 23, the body fluid stays for a relatively long time, and the deposition of the antimicrobial agent 24 is further promoted, which is preferable. The ratio of the depression depth 23D to the depression depth 22D is 23d >, 22d, and 23D/22D is preferably 3 or more, more preferably 10 or more, and preferably 200 or less, more preferably 150 or less.

Although not shown in fig. 4, the second layer 22 may have a plurality of through-type or non-through-type recesses 22a on the skin-facing surface, and may have a plurality of protrusions protruding toward the skin of the wearer. For example, in the laminated structure 20A, when the recessed portion 22a of the second layer 22 is a non-penetrating recessed portion, the skin-facing surface of the second layer 22 may have the same uneven structure as the skin-facing surfaces of the first layer 21 and the third layer 23. By adopting such a structure, the liquid retainability of the second layer 22 is further improved, and the precipitation of the antibacterial agent 24 is further promoted.

From the viewpoint of further reliably exerting the above-described operational effects, the ratio of the total area of the recessed portions 22a to the area of the skin-facing surface of the second layer 22 is preferably 1% or more, more preferably 3% or more, and preferably 15% or less, more preferably 12% or less. According to such a ratio, the liquid retainability of the second layer 22 can be improved. The area of the recessed portion of each layer (the first layer 21, the second layer 22, or the third layer 23) constituting the laminated structure can be measured in the following manner.

< method for measuring area of depressed portion >

A magnified photograph of the cut piece was taken on a flat surface (skin-facing surface or non-skin-facing surface) under a microscope (VHX-1000, manufactured by KEYENCE CORPORATION) at a temperature of 20. + -. 2 ℃ and a relative humidity of 65. + -. 5%. The area of the depression was measured from the magnified photograph. The area of 3 depressed parts was measured, and the average value of 3 points was taken as the area of the depressed part of the sheet to be measured.

In the laminated structure 20B shown in fig. 5, the third layer 23 contains an antibacterial agent 24. In the laminated structure 20B, the topsheet 3 has a two-layer structure, and in the topsheet 3 having the two-layer structure, the skin-side layer relatively close to the skin of the wearer is the first layer 21, and the non-skin-side layer relatively far from the skin of the wearer is the second layer 22. The skin-side wrapping sheet 52 disposed adjacent to the front sheet 3 of the two-layer structure at a position on the non-skin-facing surface side of the sheet 3 is the third layer 23. As described above, the skin-facing concave portions 21a (concave-convex structure) of the first layer 21 (skin-side layer of the topsheet 3) and the skin-facing concave portions 23a (concave-convex structure) of the third layer 23 (skin-side wrapping sheet 52) may be structures that are originally provided in the

layers

21 and 23, that is, structures that are always present, or structures that are formed when the diaper 1 is worn, such as wrinkles formed in the standing state of the leakage-preventing cuffs 7. In the laminated structure 20B, the first layer 21 (the skin-side layer of the topsheet 3) and/or the second layer 22 (the non-skin-side layer of the topsheet 3) may contain the antimicrobial agent 24.

In the laminated structure 20C shown in fig. 6, the recess 23a of the third layer 23 is a non-penetrating recess. The laminated structure 20C is the same as the laminated structure 20 shown in fig. 3 except for the above points.

In the laminated structure 20D shown in fig. 7, the third layer 23 contains an antibacterial agent 24. In the laminated structure 20D, an intermediate sheet 25, which is also referred to as a sub-layer, a second sheet, or the like, is interposed between the topsheet 3 (the first layer 21) and the skin-side core sheet 52 (the third layer 23), and the intermediate sheet 25 is the second layer 22. As the intermediate sheet 25, for example, a liquid-permeable sheet such as nonwoven fabric or paper can be used. As described above, the skin-facing concave portions 21a (concave-convex structure) of the first layer 21 (topsheet 3) and the skin-facing concave portions 23a (concave-convex structure) of the third layer 23 (skin-side wrapping sheet 52) may be structures that are originally provided in the

layers

21 and 23, that is, structures that are always present, or structures that are formed when the diaper 1 is worn, such as wrinkles formed in the standing state of the leakage-preventing cuffs 7. In the laminated structure 20D, the second layer 22 (intermediate sheet 25) may contain the antibacterial agent 24 instead of the third layer 23 (skin-side wrapping sheet 52), or not only the third layer 23 but also the first layer 21 (front sheet 3) and/or the second layer 22 may contain the antibacterial agent 24.

In the laminated structure of the present invention including the

laminated structures

20, 20A, 20B, 20C, and 20D described above, the first layer 21 may have a fusion portion in which constituent fibers (synthetic fibers) are fused to each other. As a specific example of the first layer 21 having a fused portion, the topsheet 3 including a nonwoven fabric can be exemplified. Since the fused portion is a portion having a lower liquid permeability than the non-fused portion and hardly allowing liquid such as urine to pass therethrough, the first layer 21 has the fused portion, so that the liquid permeability of the first layer 21 is lowered and the liquid retention performance of the first layer 21 can be improved. In addition, the fused portion of the first layer 21 is preferably present at the formation position of the recessed portion 21a of the first layer 21. That is, the portion defining the bottom of the non-through recess 21a is preferably a fusion-spliced portion, whereby the liquid retention of the first layer 21 can be further improved. As a method of forming the fused portion at the formation position of the recessed portion 21a, for example, a method of manufacturing the first layer 21 (topsheet 3) having no recessed portion and a flat surface, and performing compression processing such as embossing with heat at a predetermined portion of the first layer 21 can be cited. By this compression process, the material of the compressed portion is heated and melted to form a fused portion.

From the viewpoint of more reliably achieving the effect of the fused portion, the ratio of the total area of the fused portion to the area of the skin-facing surface of the first layer 21 (hereinafter also referred to as "fused portion area ratio") is preferably 1% or more, more preferably 3% or more, and preferably 15% or less, more preferably 12% or less. By setting the area ratio of the fused portion of the skin-facing surface of the first layer 21 within this range, both the liquid retentivity and the liquid permeability of the first layer 21 can be achieved at a higher level. The area ratio of the fused portion of one face (skin-facing face or non-skin-facing face) of each of the layers (first layer 21, second layer 22, or third layer 23) constituting the laminated structure can be measured by the following method.

< method for measuring area ratio of welded portion >

A sheet to be measured (a layer to be measured in a laminated structure) was taken out from an absorbent article, and the taken-out sheet was cut into a planar quadrangular shape having a length of 50mm in the longitudinal direction (longitudinal direction) and a length of 50mm in the transverse direction (width direction) of the absorbent article, to prepare cut pieces of the sheet. However, when a cut piece having this size cannot be produced, the cut piece is produced as large as possible.

A magnified photograph of the cut piece was taken on a flat surface (skin-facing surface or non-skin-facing surface) under a microscope (VHX-1000, manufactured by KEYENCE CORPORATION) at a temperature of 20. + -. 2 ℃ and a relative humidity of 65. + -. 5%. The number of the fusion-joined portions is counted from the enlarged photograph, the area of each fusion-joined portion in a plan view is measured, and the total area of the fusion-joined portions is determined by multiplying the area by the number. Next, the total area of the fused portions is divided by the area of the plane of the cut pieces of the magnified photograph, and the area of the fused portions per unit area is calculated as the area ratio of the fused portions on the plane.

The second layer 22 may have a fused portion in which constituent fibers (synthetic fibers) are fused to each other. Specific examples of the second layer 22 having a fused portion include a skin-side wrapping sheet 52, an absorbent core 50, and an intermediate sheet 25, which are made of nonwoven fabric. In addition, as shown in fig. 5, when the non-skin side layer of the topsheet 3 having the two-layer structure is configured to include a nonwoven fabric, the non-skin side layer may have a fused portion. Since the second layer 22 has the fused portion, the liquid permeability of the second layer 22 is reduced, and the liquid retention performance of the second layer 22 can be improved. In addition, the fused portion of the second layer 22 is preferably present at the formation position of the recessed portion 22a of the second layer 22. That is, the portion defining the bottom of the non-through type recessed portion 22a is preferably a fused portion, whereby the liquid retention of the second layer 22 can be further improved. The recessed portions 22a of the second layer 22 can be formed by the same method as the method for forming the recessed portions 21a of the first layer 21.

From the viewpoint of more reliably exerting the action and effect by the above-described fused portions, the proportion of the total area of the fused portions to the area of the skin-facing surface of the second layer 22 is preferably 1% or more, more preferably 3% or more, and preferably 15% or less, more preferably 12% or less. When the area ratio of the fused portion in the skin-facing surface of the second layer 22 is within this range, the liquid retentivity and the liquid permeability of the second layer 22 can be achieved at a higher level.

When the second layer 22 has the recessed portion 22a on the skin-facing surface, there is a portion where the recessed portion 21a of the first layer 21 and the recessed portion 22a of the second layer 22 are integrally recessed (hereinafter, also referred to as "two-layer integrated recessed portion"), and it is preferable that the constituent fibers (synthetic fibers) of the second layer 22 in the two-layer integrated recessed portion are fused to each other. Typically, the portion defining the bottom of the two-layer integral recess is a fusion. Since the two-layer integrated recess portion is present, in the first layer 21 and the second layer 22 which are two layers closest to the skin of the wearer in the laminated structure, body fluid is likely to accumulate, and the deposition of the antibacterial agent 24 can be further promoted. The two-layer integrated recess portion can be formed by subjecting the laminate to compression processing such as embossing processing accompanied by heat from the first layer 21 side in a state where the first layer 21 and the second layer 22 are laminated.

The antimicrobial agent used in the present invention is not particularly limited, and any antimicrobial agent that can be mixed in the absorbent article of this type may be used, and may be an inorganic antimicrobial agent or an organic antimicrobial agent, and 1 type or 2 or more types may be used alone or in combination. Specific examples of the inorganic antibacterial agent include silver-supported zeolite and titanium oxide. Specific examples of the organic antibacterial agent include sodium lauryl sulfate, benzalkonium chloride, and alkylpolyaminoethyl glycine hydrochloride.

In the laminated structure of the present invention, the content of the antibacterial agent can be appropriately set depending on the use of the absorbent article, the kind of the antibacterial agent, and the like, and is not particularly limited, but is preferably 0.0005 mass% or more, more preferably 0.001 mass% or more, and preferably 0.05 mass% or less, more preferably 0.03 mass% or less with respect to the entire mass of the laminated structure. Generally, the antibacterial property is improved as the content of the antibacterial agent in the laminated structure is increased, but if the content of the antibacterial agent is too large, there is a possibility that the skin irritation caused by the antibacterial agent becomes too strong or the production cost becomes too high.

From the same viewpoint, the gram weight of the antibacterial agent in the laminated structure of the present invention is preferably 0.003g/m ² Above, more preferably 0.005g/m ² Above, and preferably 0.2g/m ² The amount of the surfactant is more preferably 0.15g/m or less ² The following.

The absorbent article of the present invention is not limited to the open type disposable diaper as in the above-described embodiment, and includes a wide range of articles for absorbing body fluid (urine, menstrual blood, loose stool, sweat, etc.) discharged from a human body, and also includes a pants type disposable diaper, a sanitary napkin, a sanitary panty, and the like which do not have a fastening structure such as the fastening member 14 and the fastening region 15.

The present invention has been described above based on embodiments thereof, but the present invention is not limited to the above embodiments and can be modified as appropriate.

For example, a through-type depression and a non-through-type depression may be mixed in the skin-facing surface of 1 layer (typically, the third layer made of an absorbent core) constituting the laminated structure.

All of the components of the above-described embodiment can be appropriately used with each other. The following is further disclosed with respect to the above-described embodiments of the present invention.

<1>

An absorbent article having a layered structure for absorbing and retaining body fluid excreted by a wearer,

the laminated structure has: a first layer disposed relatively close to the skin of the wearer; a third layer disposed at a position relatively distant from the skin of the wearer; and a second layer disposed between the first layer and the third layer,

the first layer and the third layer each have a concave portion on the skin-facing surface,

a space corresponding to the recess of the third layer exists between the second layer and the third layer,

the second layer or the third layer contains an antimicrobial agent,

the recessed portion of the first layer and the recessed portion of the third layer are present at positions overlapping with an antibacterial agent placement region where the antibacterial agent is placed in a plan view.

<2> the absorbent article according to <1>, wherein,

the depression depth of the depression of the third layer is greater than the depression depth of the depression of the first layer.

<3> the absorbent article according to <2>, wherein,

the ratio of the depression depth of the depression in the third layer to the depression depth of the depression in the first layer is 3 or more and 200 or less, preferably 10 or more and 150 or less.

<4> the absorbent article according to <2> or <3>, wherein,

the depressed depth of the depressed portion of the third layer is 0.05mm or more and 10mm or less, preferably 1mm or more and 8mm or less.

<5> the absorbent article according to any one of <2> to <4>, wherein,

the recessed depth of the recessed portion of the first layer is 0.05mm or more and 1mm or less, preferably 0.075mm or more and 0.8mm or less.

<6> the absorbent article according to any one of <1> to <5>, wherein,

the first layer also contains an antimicrobial agent.

<7> the absorbent article according to any one of <1> to <6>, wherein,

the first layer has a fused portion where the constituent fibers are fused to each other.

<8> the absorbent article according to <7>, wherein,

the ratio of the total area of the fused portions to the area of the skin-facing surface of the first layer is 1% to 15%, preferably 3% to 12%.

<9> the absorbent article according to any one of <1> to <8>, wherein,

the first layer has a plurality of the concave portions on the skin-facing surface, and a plurality of convex portions protruding toward the skin of the wearer.

<10> the absorbent article according to <9>, wherein,

the ratio of the total area of the recessed portions to the area of the skin-facing surface of the first layer is 1% or more and 15% or less, and preferably 3% or more and 12% or less.

<11> the absorbent article according to any one of <1> to <10>, wherein,

the second layer contains an antimicrobial agent.

<12> the absorbent article according to any one of <1> to <11>, wherein,

the second layer has a fused portion where the constituent fibers are fused to each other.

<13> the absorbent article according to <12>, wherein,

the ratio of the total area of the fused portions to the area of the skin-facing surface of the second layer is 1% or more and 15% or less, and preferably 3% or more and 12% or less.

<14> the absorbent article according to any one of <1> to <13>, wherein,

the second layer has a recess on the skin-facing surface.

<15> the absorbent article according to <14>, wherein,

the depression depth of the depressions of the second layer is greater than the depression depth of the depressions of the first layer.

<16> the absorbent article according to any one of <14> and <15>, wherein,

the ratio of the depression depth of the depressions in the second layer to the depression depth of the depressions in the first layer is 3 or more and 200 or less, preferably 10 or more and 150 or less.

<17> the absorbent article according to any one of <14> to <16>, wherein,

the recessed depth of the recessed portion of the second layer is 0.05mm or more and 10mm or less, preferably 1mm or more and 8mm or less.

<18> the absorbent article according to any one of <14> to <17>, wherein,

there is a portion where the depressed portions of the first layer and the depressed portions of the second layer are depressed integrally, and the constituent fibers of the second layer in this portion are fused to each other.

<19> the absorbent article according to any one of <14> to <18>, wherein,

the second layer has a plurality of the concave portions on the skin-facing surface and a plurality of convex portions protruding toward the skin of the wearer.

<20> the absorbent article according to <19>, wherein,

the ratio of the total area of the depressions to the area of the skin-facing surface of the second layer is 1% to 15%, preferably 3% to 12%.

<21> the absorbent article according to any one of <1> to <20>, wherein,

the second layer has a lower liquid permeability than the first layer.

<22> the absorbent article according to any one of <1> to <21>, wherein,

the third layer contains an antimicrobial agent.

<23> the absorbent article according to any one of <1> to <22>, wherein,

in the third layer, the grammage of the formation position of the recessed portion is lower than the grammage of the peripheral portion of the recessed portion.

<24> the absorbent article according to any one of <1> to <23>, wherein,

the recessed portion of the third layer is a through hole penetrating the third layer in the thickness direction.

<25> the absorbent article according to <24>, wherein,

the recessed portion of the third layer is a non-penetrating recessed portion, and the ratio of the grammage at the formation position of the recessed portion to the grammage at the peripheral portion of the recessed portion is 0.08 or more and 0.8 or less, preferably 0.1 or more and 0.6 or less.

<26> the absorbent article according to <24> or <25>, wherein,

the grammage of the formation position of the recessed part is 50g/m ² Above and 500g/m ² Hereinafter, it is preferably 100g/m ² Above and 400g/m ² The following.

<27> the absorbent article according to any one of <1> to <26>, wherein,

the second layer has a recessed portion on the skin-facing surface,

the depression depth of the depression of the third layer is greater than the depression depth of the depression of the second layer.

<28> the absorbent article according to <27>, wherein,

the ratio of the depression depth of the depression in the third layer to the depression depth of the depression in the second layer is 3 or more and 200 or less, preferably 10 or more and 150 or less.

<29> the absorbent article according to any one of <1> to <28>, wherein,

the third layer contains cellulose fibers and a water-absorbent polymer.

<30> the absorbent article according to <29>, wherein,

the content of the cellulose fibers in the third layer is 20 mass% or more and 80 mass% or less, and preferably 30 mass% or more and 70 mass% or less.

<31> the absorbent article according to <29> or <30>, wherein,

the content of the water-absorbent polymer in the third layer is 20 mass% or more and 80 mass% or less, and preferably 30 mass% or more and 70 mass% or less.

<32> the absorbent article according to any one of <1> to <31>, wherein,

the third layer has lower liquid permeability than the second layer.

<33> the absorbent article according to any one of <1> to <32>, wherein,

has a longitudinal direction corresponding to the front-back direction of the wearer and a transverse direction orthogonal to the longitudinal direction, and leak-proof cuffs which are erected toward the skin of the wearer when worn are arranged along both side portions of the laminated structure in the longitudinal direction,

in the standing state of the leakage prevention cuff, wrinkles can be formed in at least 1 of the plurality of layers constituting the laminated structure.

<34> the absorbent article according to any one of <1> to <33>, wherein,

the antibacterial agent is an inorganic antibacterial agent or an organic antibacterial agent.

<35> the absorbent article according to <34>, wherein,

the organic antibacterial agent is 1 or 2 selected from silver-carrying zeolite and titanium oxide.

<36> the absorbent article according to <34> or <35>, wherein,

the organic antibacterial agent is 1 or 2 selected from sodium dodecyl sulfate, benzalkonium chloride and hydrochloric acid alkyl polyamino ethyl glycine.

<37> the absorbent article according to any one of <1> to <36>, wherein,

there are no other layers between the first layer and the second layer and no other layers between the second layer and the third layer.

<38> the absorbent article according to any one of <1> to <37>, wherein,

the first layer is a topsheet arranged at a position close to the skin of the wearer, the third layer is a liquid-retentive absorbent core, and the second layer is a core-covering sheet covering the absorbent core.

Industrial applicability of the invention

The absorbent article of the present invention is excellent in antibacterial properties, and therefore can effectively suppress troubles caused by the growth of bacteria, such as a problem with the skin of a wearer or the generation of unpleasant odor when worn.

Claims

1. An absorbent article having a layered structure for absorbing and retaining body fluid excreted by a wearer, characterized in that:

the first layer and the third layer are respectively provided with a concave part on the skin-facing surface,

the second layer or the third layer contains an antimicrobial agent,

the recessed portion of the first layer and the recessed portion of the third layer are present at positions overlapping with an antibacterial agent disposition area where the antibacterial agent is disposed in a plan view,

the first layer is a front sheet arranged at a position close to the skin of a wearer, the third layer is a liquid-retentive absorbent core, the second layer is a core-covering sheet covering the absorbent core,

2. The absorbent article of claim 1, wherein:

3. The absorbent article of claim 2, wherein:

the ratio of the depression depth of the depression in the third layer to the depression depth of the depression in the first layer is 3 or more and 200 or less.

4. The absorbent article of claim 2 or 3, wherein:

the depth of the third layer of the recess is 0.05mm to 10 mm.

5. The absorbent article of claim 2 or 3, wherein:

the depth of the first layer is 0.05mm to 1 mm.

6. The absorbent article according to any one of claims 1 to 3, wherein:

the first layer also contains an antimicrobial agent.

7. The absorbent article according to any one of claims 1 to 3, wherein:

8. The absorbent article of claim 7, wherein:

the ratio of the total area of the fused portions to the area of the skin-facing surface of the first layer is 1% to 15%.

9. The absorbent article according to any one of claims 1 to 3, wherein:

10. The absorbent article of claim 9, wherein:

the ratio of the total area of the recessed portions to the area of the skin-facing surface of the first layer is 1% or more and 15% or less.

11. The absorbent article according to any one of claims 1 to 3, wherein:

the second layer contains an antimicrobial agent.

12. The absorbent article according to any one of claims 1 to 3, wherein:

13. The absorbent article of claim 12, wherein:

the ratio of the total area of the fused portions to the area of the skin-facing surface of the second layer is 1% to 15%.

14. The absorbent article according to any one of claims 1 to 3, wherein:

the second layer has a depression on the skin-facing surface.

15. The absorbent article of claim 14, wherein:

16. The absorbent article of claim 14, wherein:

the ratio of the depression depth of the depression in the second layer to the depression depth of the depression in the first layer is 3 or more and 200 or less.

17. The absorbent article of claim 14, wherein:

the depth of the recess of the second layer is 0.05mm to 10 mm.

18. The absorbent article of claim 14, wherein:

the second layer has a plurality of the concave portions on the skin-facing surface, and a plurality of convex portions protruding toward the skin of the wearer.

19. The absorbent article of claim 18, wherein:

the ratio of the total area of the recessed portions to the area of the skin-facing surface of the second layer is 1% or more and 15% or less.

20. The absorbent article according to any one of claims 1 to 3, wherein:

the second layer has a lower liquid permeability than the first layer.

21. The absorbent article according to any one of claims 1 to 3, wherein:

the third layer contains an antimicrobial agent.

22. The absorbent article according to any one of claims 1 to 3, wherein:

23. The absorbent article of claim 1, wherein:

24. The absorbent article of claim 1, wherein:

the recessed portion of the third layer is a non-penetrating recessed portion, and the ratio of the grammage at the formation position of the recessed portion to the grammage at the peripheral portion of the recessed portion is 0.08 or more and 0.8 or less.

25. The absorbent article of claim 23 or 24, wherein:

the grammage of the formation position of the recessed part is 50g/m ² Above and 500g/m ² The following.

26. The absorbent article according to any one of claims 1 to 3, wherein:

the second layer has a concave portion on the skin-facing surface,

27. The absorbent article of claim 26, wherein:

a ratio of a depression depth of the depression portion of the third layer to a depression depth of the depression portion of the second layer is 3 or more and 200 or less.

28. The absorbent article according to any one of claims 1 to 3, wherein:

the third layer contains cellulose fibers and a water-absorbent polymer.

29. The absorbent article of claim 28, wherein:

the content of the cellulose fibers in the third layer is 20 mass% or more and 80 mass% or less.

30. The absorbent article of claim 28, wherein:

the content of the water-absorbent polymer in the third layer is 20 mass% or more and 80 mass% or less.

31. The absorbent article according to any one of claims 1 to 3, wherein:

the third layer has lower liquid permeability than the second layer.

32. The absorbent article according to any one of claims 1 to 3, wherein:

has a longitudinal direction corresponding to the front-back direction of the wearer and a transverse direction orthogonal to the longitudinal direction, and leak-proof cuffs standing up to the skin side of the wearer when worn are arranged along both side portions of the laminated structure in the longitudinal direction,

in the standing state of the leakage preventive cuffs, at least 1 layer of the plurality of layers constituting the laminated structure can be wrinkled.

33. The absorbent article according to any one of claims 1 to 3, wherein:

34. The absorbent article of claim 33, wherein:

35. The absorbent article of claim 33, wherein:

36. The absorbent article according to any one of claims 1 to 3, wherein: