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CN113679535B - absorbent materials - Google Patents

absorbent materials

Info

Publication number
CN113679535B
CN113679535B CN202010426324.7A CN202010426324A CN113679535B CN 113679535 B CN113679535 B CN 113679535B CN 202010426324 A CN202010426324 A CN 202010426324A CN 113679535 B CN113679535 B CN 113679535B
Authority
CN
China
Prior art keywords
skin
absorbent article
cover
absorbent
openings
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202010426324.7A
Other languages
Chinese (zh)
Other versions
CN113679535A (en
Inventor
泷野俊介
郭晓彤
吴晨
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Unicharm Corp
Original Assignee
Unicharm Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Unicharm Corp filed Critical Unicharm Corp
Priority to CN202010426324.7A priority Critical patent/CN113679535B/en
Publication of CN113679535A publication Critical patent/CN113679535A/en
Application granted granted Critical
Publication of CN113679535B publication Critical patent/CN113679535B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape specially adapted to be worn around the waist, e.g. diapers, nappies
    • A61F13/496—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape specially adapted to be worn around the waist, e.g. diapers, nappies in the form of pants or briefs
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers of the pads
    • A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
    • A61F13/51121—Topsheet, i.e. the permeable cover or layer facing the skin characterised by the material
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/56—Supporting or fastening means
    • A61F13/5622—Supporting or fastening means specially adapted for diapers or the like
    • A61F13/565—Supporting or fastening means specially adapted for diapers or the like pants type diaper
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/56—Supporting or fastening means
    • A61F13/58—Adhesive tab fastener elements
    • A61F13/581—Tab fastener elements combining adhesive and mechanical fastening
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/56—Supporting or fastening means
    • A61F13/64—Straps, belts, ties or endless bands
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers of the pads
    • A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
    • A61F2013/51186—Topsheet, i.e. the permeable cover or layer facing the skin specially shaped topsheets
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F2013/530481—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials

Landscapes

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

Abstract

本发明提供一种吸收性物品。课题在于提高吸收性物品内的透气性。一种吸收性物品(1)，其具有相互交叉的纵向、横向以及厚度方向，包括吸收性主体(10)和配置于穿着者的腰身的腰身部(2a)，其中，吸收性主体(10)包括：吸收性芯(11)；以及顶片(13)，其配置于比吸收性芯(11)靠肌肤侧的位置，具有向非肌肤侧凹陷且沿着纵向的凹部(13a)，腰身部(2)包括从肌肤侧覆盖吸收性主体(10)的纵向上的一侧的端头的罩部(5)，凹部(13a)包括从肌肤侧被罩部(5)覆盖的部分和未被罩部(5)从肌肤侧覆盖的部分，在伸长状态下，在纵向上，在罩部(5)中的从肌肤侧覆盖凹部(13a)的部分设有开孔(40)。

The present invention provides an absorbent article. The objective is to improve the breathability of the absorbent article. An absorbent article (1) having intersecting longitudinal, transverse and thickness directions includes an absorbent body (10) and a waist portion (2a) disposed on the waist of the wearer, wherein the absorbent body (10) includes: an absorbent core (11); and a top sheet (13) disposed on the skin side of the absorbent core (11) and having a recess (13a) recessed toward the non-skin side and along the longitudinal direction, the waist portion (2) includes a cover portion (5) covering one end of the absorbent body (10) in the longitudinal direction from the skin side, the recess (13a) includes a portion covered by the cover portion (5) from the skin side and a portion not covered by the cover portion (5) from the skin side, and in the extended state, in the longitudinal direction, the portion of the cover portion (5) covering the recess (13a) from the skin side is provided with an opening (40).

Description

Absorbent article
Technical Field
The present invention relates to an absorbent article.
Background
Conventionally, disposable diapers and the like have been known as absorbent articles for absorbing excretions such as urine. In such an absorbent article, in order to prevent the end of the absorbent body from directly contacting the skin of the wearer when worn, the end of the absorbent body may be covered with a folded-back portion of the waist portion and a sheet member different from the folded-back portion.
Prior art literature
Patent literature
Patent document 1 Japanese patent application laid-open No. 2017-99854
Disclosure of Invention
Problems to be solved by the invention
In the absorbent article of patent document 1, the end of the absorbent body having the sheet in which the concave portion is formed is covered with the folded-back portion of the waistline portion. However, there is a problem in that the air flowing in the concave portion is difficult to be discharged to the outside of the absorbent article. The same problem applies even when the end of the absorbent body having the sheet with the concave portion is covered with a sheet member different from the folded-back portion.
The present invention has been made in view of the above-described problems, and an object of the present invention is to improve breathability in an absorbent article.
Solution for solving the problem
The main invention for achieving the above object is an absorbent article comprising an absorbent main body and a waist portion disposed on the waist of a wearer, wherein the absorbent main body comprises an absorbent core and a top sheet disposed closer to the skin side than the absorbent core, the absorbent main body comprises a concave portion recessed toward the non-skin side and extending along the longitudinal direction, the waist portion comprises a cover portion covering one end of the absorbent main body in the longitudinal direction from the skin side, the concave portion comprises a portion covered by the cover portion from the skin side and a portion uncovered by the cover portion from the skin side, and an opening is provided in the cover portion in the portion covered by the concave portion from the skin side in the longitudinal direction in an extended state.
Other features of the present invention will become apparent from the description of the present specification and the accompanying drawings.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, the breathability in the absorbent article can be improved.
Drawings
Fig. 1 is a schematic perspective view of a pants-type disposable diaper 1.
Fig. 2 is a schematic plan view of the diaper 1 in an extended and stretched state when viewed from the skin side.
Fig. 3 is a schematic cross-sectional view of line A-A of fig. 2.
Fig. 4 is a schematic plan view of the cover 5 covering the end of the absorbent body 10.
Fig. 5 is a view showing a plurality of openings 40 in the schematic plan view of fig. 2.
Fig. 6 is a schematic plan view of the diaper 1 in an extended and stretched state when viewed from the non-skin side.
Fig. 7A is a schematic perspective view of example 1 of the skin side surface of the top sheet 13. Fig. 7B is a schematic perspective view of example 2 of the skin side surface of the top sheet 13.
Fig. 8 is a schematic cross-sectional view of the top sheet 13 having the concave portion 13a and the cover portion 5 having the opening 40.
Fig. 9A is a schematic plan view showing the inner side bonded portion 90 and the inner side non-bonded portion 91. Fig. 9B is a schematic cross-sectional view of line A-A of fig. 9A.
Fig. 10A is a schematic plan view showing the cover-side bonded portion 92 and the cover-side non-bonded portion 93. Fig. 10B is a schematic cross-sectional view of line A-A of fig. 10A.
Description of the reference numerals
1, Pants-type disposable diaper (absorbent article), 2, waist portion, 2a, skin-side sheet, 2b, non-skin-side sheet, 3, folded-back portion, 5, cover portion, 6, joining portion, 10, absorbent body, 11, absorbent core, 11c, neck portion, 13, top sheet, 13a, concave portion, 13b, convex portion, 14, compressed portion, 20, abdomen-side waist portion, 20et, abdomen-side upper end, 23, elastic member, 30, back-side waist portion, 30et, back-side upper end, elastic member, 40, aperture, 40a, skin-side aperture, 40b, non-skin-side aperture, 50, protruding portion, 90, inner-side adhesive portion, 91, inner-side non-adhesive portion, 92, cover-side adhesive portion, 93, cover-side non-adhesive portion, BH, waist opening portion, LH, leg opening.
Detailed Description
At least the following matters will be apparent from the description of the present specification and the accompanying drawings.
(Technical solution 1)
An absorbent article comprising an absorbent main body and a waist portion disposed on the waist of a wearer, wherein the absorbent main body comprises an absorbent core and a top sheet disposed closer to the skin side than the absorbent core, the absorbent main body comprises a concave portion recessed toward the non-skin side and along the longitudinal direction, the waist portion comprises a cover portion covering one end of the absorbent main body in the longitudinal direction from the skin side, the concave portion comprises a portion covered by the cover portion from the skin side and a portion not covered by the cover portion from the skin side, and an opening is provided in the cover portion in the longitudinal direction at a portion covering the concave portion from the skin side.
According to such an absorbent article, air in the absorbent article flows through the concave portion of the top sheet as a flow path, and is discharged from the opening provided in the cover portion. This can improve the breathability of the absorbent article.
(Technical solution 2)
As this absorbent article, it is desirable that an elastic member that is stretchable in the lateral direction is arranged in the waist portion along the lateral direction, and at least a part of the elastic member overlaps the cover portion when viewed in the thickness direction.
According to such an absorbent article, the cover portion is provided with the wrinkles extending in the longitudinal direction due to the elastic member, and the cover portion is also provided with the flow path through which the air in the absorbent article flows. This can further improve the breathability of the absorbent article.
(Technical solution 3)
As this absorbent article, it is desirable that the elastic member is arranged so as not to overlap the absorbent core when viewed in the thickness direction.
According to such an absorbent article, the influence of the rigidity of the absorbent core on the contraction of the elastic member can be suppressed. This makes it possible to easily form wrinkles in the cover portion, which are caused by the elastic member to extend in the longitudinal direction. Further, formation of wrinkles in the absorbent core can be suppressed, whereby a decrease in the absorption performance of the absorbent core can be suppressed.
(Technical solution 4)
As this absorbent article, it is desirable that the opening of the cover portion is provided so as not to overlap the absorbent core when viewed in the thickness direction.
According to such an absorbent article, the moisture absorbed by the absorbent core is suppressed from returning to the skin side through the openings. Thus, the uncomfortable feeling of the wearer due to rewet can be reduced.
(Technical solution 5)
As the absorbent article, it is desirable that the cover portion does not overlap the absorbent core when viewed in the thickness direction.
According to such an absorbent article, the moisture absorbed by the absorbent core is suppressed from returning to the wearer along the cover portion. Thus, the uncomfortable feeling of the wearer due to rewet can be reduced.
(Technical scheme 6)
As this absorbent article, it is desirable that the cover portion includes a region provided on the edge portion of the aperture toward the non-skin side and formed to have a higher area density than the surrounding area of the aperture.
According to such an absorbent article, even when moisture absorbed by the absorbent core flows along the cover portion, a certain degree of moisture is maintained in the high-density region. Thus, the uncomfortable feeling of the wearer due to rewet can be reduced.
(Technical scheme 7)
As the absorbent article, it is desirable that an opening-side elastic member is further disposed on the waist opening side of the waist portion in the longitudinal direction of the waist portion than the elastic member,
The force for elongating the elastic member by a unit length is larger than the force for elongating the opening-side elastic member by the unit length.
According to such an absorbent article, a flow path through which air flows is easily formed by forming wrinkles in the waistline portion. This makes it possible to facilitate the flow of air in the absorbent article.
(Technical scheme 8)
As this absorbent article, it is desirable that the cover portion has a back cover portion disposed on a back side and a stomach cover portion disposed on a stomach side, and the elastic member includes a back elastic member disposed on a back side of the waist portion and at least a portion of which overlaps the back cover portion, and a stomach elastic member disposed on a stomach side of the waist portion and at least a portion of which overlaps the stomach cover portion, and a force for extending the back elastic member by a unit length is larger than a force for extending the stomach elastic member by the unit length.
According to such an absorbent article, a flow path through which air flows is easily formed by forming wrinkles in the waistline portion. This makes it possible to make air easier to flow in the absorbent article.
(Technical solution 9)
As this absorbent article, it is desirable that the top sheet has other concave portions in the lateral direction, which are different from the concave portions, and that in the longitudinal direction, other apertures in the cover portion, which are different from the apertures, are provided in a portion covering the concave portions from the skin side, and that the pitch between the apertures and the other apertures in the lateral direction is smaller than the pitch between the concave portions and the other concave portions.
According to such an absorbent article, the openings of the cover portion are arranged in both the concave portion of the top sheet and the portion other than the concave portion of the top sheet when viewed in the thickness direction. This can further improve the air permeability.
(Technical scheme 10)
As this absorbent article, it is desirable that the top sheet has other concave portions in the lateral direction, which are different from the concave portions, and that in the longitudinal direction, other apertures in the cover portion, which are different from the apertures, are provided in a portion covering the concave portions from the skin side, and that the pitch between the apertures and the other apertures is larger than the pitch between the concave portions and the other concave portions.
According to such an absorbent article, the number of openings in the portion of the cover portion that covers the recess is reduced. Thus, the material strength can be improved while the air permeability is ensured.
(Technical scheme 11)
In the absorbent article, it is desirable that a plurality of inner side adhesive portions, which are fixed between the absorbent body and the waist portion, are arranged in the lateral direction by an adhesive.
According to such an absorbent article, a flow path for air is also formed longitudinally between the absorbent body and the waistline portion. Thereby, a ventilation path in the longitudinal direction of the absorbent article is easily formed.
(Technical scheme 12)
As the absorbent article, it is desirable that the waist portion has a skin-side sheet having the plurality of inner side adhesive portions provided on the skin side and having a plurality of skin-side openings, and that the plurality of inner side non-adhesive portions not forming the inner side adhesive portions are arranged on the skin side of the skin-side sheet in the lateral direction, and that the pitch at which the plurality of skin-side openings are arranged is smaller than the pitch at which the plurality of inner side non-adhesive portions are arranged in the lateral direction.
According to such an absorbent article, a flow path is formed through which air in the absorbent article flows through the skin-side opening. This can further improve the breathability of the absorbent article.
(Technical scheme 13)
As the absorbent article, it is desirable that the absorbent article has a cover-side bonded portion in which the cover portion and the absorbent body are fixed by an adhesive and a cover-side non-bonded portion in which the cover portion and the absorbent body are not fixed, and the hole overlaps the cover-side non-bonded portion when viewed in the thickness direction.
According to such an absorbent article, air in the absorbent article flows through the concave portion of the top sheet as a flow path, and is discharged through the openings provided in the region overlapping the cover-side non-bonded portion. This can improve the breathability of the absorbent article.
(Technical solution 14)
In the absorbent article, it is preferable that the cover portion has another hole, which is located at a position different from the hole in the lateral direction, in a portion covering the concave portion from the skin side in the longitudinal direction, and the other hole overlaps the cover-side adhesive portion when viewed in the thickness direction.
According to such an absorbent article, the plurality of openings of the cover portion have both openings that overlap with the bonded portions bonded to the absorbent body and openings that do not overlap with the bonded portions bonded to the absorbent body. Thus, the material strength can be improved while the air permeability is ensured.
(Technical scheme 15)
As the absorbent article, it is desirable that the waist portion has a skin-side sheet having skin-side openings and a non-skin-side sheet provided on a non-skin side of the skin-side sheet, and that at least a part of the openings of the cover portion overlap at least a part of the skin-side openings when viewed in the thickness direction.
According to such an absorbent article, the ventilation opening is formed in the thickness direction of the absorbent article. This can further improve the breathability of the absorbent article.
= = Embodiment= = = =
< Basic Structure of diaper 1 >
Fig. 1 is a schematic perspective view of a pants-type disposable diaper 1. Fig. 2 is a schematic plan view of the diaper 1 in an extended and stretched state when viewed from the skin side. Fig. 3 is a schematic cross-sectional view of line A-A of fig. 2. Fig. 4 is a schematic plan view of the cover 5 covering the end of the absorbent body 10. In fig. 2, the hole 40 described later is omitted for convenience of description.
As an example of the absorbent article used in the present embodiment, the basic structure of the pants-type disposable diaper 1 (hereinafter, also referred to as "diaper 1") will be described. Here, the "developed" state refers to a state in which both end portions of the lateral side portion (hereinafter referred to as the abdominal side waistline portion 20) of the diaper 1 are released from engagement with both end portions of the back side portion (hereinafter referred to as the back side waistline portion 30), the abdominal side portion and the back side portion are separated, and the diaper 1 is opened in the longitudinal direction thereof, whereby the diaper 1 is developed on a flat surface. The term "extended state" refers to a state in which the product (diaper 1) is extended to a state in which no wrinkles are generated, specifically, a state in which the product is extended to a length in which the dimensions of the respective members (for example, the waistline portion 2 and the like described later) constituting the diaper 1 match the dimensions of the members alone or are close to the dimensions of the members alone.
The diaper 1 has three directions, i.e., a vertical direction, a horizontal direction, and a front-rear direction, which are orthogonal to each other in the pants-type state of fig. 1. In the following, the upper side and the lower side in the up-down direction in the pants-type state are also referred to as the "waist opening side" and the "crotch side", respectively, and the front side and the rear side in the front-rear direction are also referred to as the "abdomen side" and the "back side", respectively.
On the other hand, in the developed and extended state of fig. 2, the diaper 1 has a longitudinal direction and a width direction orthogonal to each other. Hereinafter, the one side and the other side in the longitudinal direction in the expanded and extended state are also referred to as "ventral side" and "dorsal side", respectively. The width direction in the developed and extended state is the same direction as the left-right direction in the pants-type state. Therefore, hereinafter, the width direction is also referred to as "left-right direction". The longitudinal direction in the developed and extended state is a direction along the up-down direction in the pants-type state. The direction orthogonal to the up-down direction (longitudinal direction) and the left-right direction (width direction) is referred to as "thickness direction", the side that contacts the skin of the wearer is referred to as "skin side", and the opposite side is referred to as "non-skin side".
The diaper 1 has an absorbent main body 10 and a waist portion 2.
Absorbent body 10
The absorbent body 10 is a portion having a function of absorbing excrement such as urine. As shown in fig. 2, the absorbent main body 10 is formed in a rectangular shape in plan view. The absorbent main body 10 is disposed at the center in the lateral direction while being longitudinally along the vertical direction of the diaper 1. As shown in fig. 4, the absorbent main body 10 has an absorbent core 11 and a top sheet 13.
The absorbent core 11 is a portion having liquid absorbency. The absorbent core 11 is formed by molding liquid absorbent fibers such as pulp fibers into a predetermined shape, and a superabsorbent polymer (so-called SAP) or the like is mixed therein. As shown in fig. 2, the absorbent core 11 is formed in a substantially hourglass shape in plan view. The absorbent core 11 has a narrowed portion 11c recessed inward in the lateral direction at the central portion in the longitudinal direction. That is, the absorbent core 11 has a constricted portion 11c having a smaller dimension in the left-right direction than the two ends of the absorbent core 11 in the longitudinal direction at a position between the two ends in the longitudinal direction.
The top sheet 13 is a liquid-permeable sheet member that is disposed on the skin side surface in the thickness direction of the absorbent core 11 and that contacts the skin of the wearer when the diaper 1 is worn. The top sheet 13 is formed of, for example, a hot air nonwoven fabric, a spunbond nonwoven fabric, or the like. The detailed structure of the top sheet 13 will be described later.
Although not shown, the absorbent body 10 includes a core wrap sheet and a back film in addition to the absorbent core 11 and the top sheet 13. The core wrap sheet is a liquid-permeable sheet member that wraps the outer peripheral surface of the absorbent core 11. As the core wrap sheet, tissue paper, nonwoven fabric, or the like can be used. The back film is a liquid-impermeable and moisture-permeable sheet member disposed on the non-skin side surface in the thickness direction of the absorbent core 11 (core-coated sheet), and is formed of, for example, a resin film. By providing the back film, movement (permeation) of moisture such as urine absorbed by the absorbent main body 10 to the garment side of the wearer is suppressed. Leakage preventing walls, not shown, may be provided on both sides of the absorbent main body 10 in the left-right direction.
Waist portion 2
The waist portion 2 constitutes the exterior of the diaper 1 and is disposed on the waist of the wearer. The waist portion 2 is sometimes referred to as an "outer body 2". The waist portion 2 is located on the non-skin side of the absorbent main body 10. As shown in fig. 1 and 2, the waistline portion 2 has a ventral waistline portion 20 and a dorsal waistline portion 30.
The abdomen-side waist portion 20 is a portion located on the abdomen side of the wearer when the diaper 1 is worn, and is located on the abdomen side (front side) than the center position CL in the longitudinal direction in fig. 2. The back side waistline portion 30 is a portion that is located on the back side of the wearer when the diaper 1 is worn, and is located on the back side (rear side) than the center position CL in the longitudinal direction in fig. 2.
In the diaper 1 of the present embodiment, as shown in fig. 2, the abdomen-side waist part 20 and the back-side waist part 30 are formed of separate members. However, the abdomen-side waistline portion 20 and the back-side waistline portion 30 may be integrally formed.
The pants-shaped diaper 1 shown in fig. 1 is formed as follows. First, from the unfolded state of fig. 2, the absorbent main body 10 and the waist portion 2 are folded in half with the center position CL in the longitudinal direction (up-down direction) as a bending position. Then, the two end portions of the abdomen-side waist portion 20 and the back-side waist portion 30 facing each other in the folded state in the left-right direction are joined by a pair of joining portions 6 formed using joining means such as welding. As a result, the abdomen-side waist part 20 and the back-side waist part 30 are connected in a ring shape, and the pants-type diaper 1 having the waist opening BH and the pair of leg hole openings LH as shown in fig. 1 is formed.
As shown in fig. 3, the abdomen-side waist part 20 and the back-side waist part 30 have a skin-side sheet 2a and a non-skin-side sheet 2b, respectively. The abdomen-side waist part 20 further has a plurality of elastic members 23. In addition, the back-side waist portion 30 also has a plurality of elastic members 33.
The skin-side sheet 2a and the non-skin-side sheet 2b are soft sheet members that are joined so as to overlap in the thickness direction. The skin-side sheet 2a is provided on the skin side, and the non-skin-side sheet 2b is provided on the non-skin side of the skin-side sheet 2 a. The skin-side sheet 2a and the non-skin-side sheet 2b are formed of, for example, spunbonded nonwoven fabric, heat-sealed nonwoven fabric, spunlaced nonwoven fabric, or the like. Examples of the raw material fibers constituting the nonwoven fabric include polypropylene (PP), polyethylene (PE), and polyethylene terephthalate (PET). In addition, not only individual fibers of polypropylene, polyethylene, or the like, but also composite fibers of a sheath-core structure composed of polypropylene, polyethylene, or the like can be used.
The plurality of elastic members 23 are elastic members that are stretchable in the lateral direction, are arranged in an aligned manner in the up-down direction (longitudinal direction) between the skin side sheet 2a and the non-skin side sheet 2b of the abdomen-side waist portion 20, and are fixed in a state of stretching in the lateral direction by an adhesive such as a hot-melt adhesive. In the same manner, the plurality of elastic members 33 are also elastic members that can extend and retract in the lateral direction, are arranged in an aligned manner in the up-down direction (longitudinal direction) between the skin side sheet 2a and the non-skin side sheet 2b of the back side waist portion 30, and are fixed in an extended state in the lateral direction by an adhesive such as a hot-melt adhesive. Thereby, stretchability is imparted to the abdomen-side waist portion 20 and the back-side waist portion 30. Further, as the elastic members 23, 33, thread-like rubber or the like can be exemplified.
As shown in fig. 3, the non-skin side sheet 2b constituting the waist portion 2 is folded back from the upper side to the lower side in the up-down direction and from the non-skin side to the skin side in the thickness direction at the abdomen-side upper end 20et of the abdomen-side waist portion 20, thereby forming a folded back portion 3. By forming the folded-back portion 3, a plurality of (3 pieces in fig. 3) sheet members are stacked in the thickness direction at the upper end portion of the abdomen-side waist portion 20 (other layers are formed at the upper end portion of the abdomen-side waist portion 20). This can improve the material strength when the diaper 1 is lifted. In fig. 3, only the non-skin side sheet 2b is folded back at the abdomen-side upper end 20et of the abdomen-side waist portion 20, and the skin side sheet 2a is not folded back. However, the folded-back portion 3 may be formed by folding back only the skin-side sheet 2a instead of folding back the non-skin-side sheet 2 b. The skin-side sheet 2a may be folded back together with the non-skin-side sheet 2b in the same manner as the non-skin-side sheet 2b to form the other folded-back portion 3. The non-skin side sheet 2b and the skin side sheet 2a may not be folded back at the abdomen-side upper end 20et of the abdomen-side waist portion 20, and the folded-back portion 3 may not be formed. By not forming the folded-back portion 3, the number of layers of the material constituting the upper end portion of the abdomen-side waist portion 20 can be reduced, and the air permeability can be suppressed.
As shown in fig. 2 and 3, the lower end portion of the folded-back portion 3 has a portion overlapping the abdomen-side upper end portion of the absorbent main body 10 when viewed in the thickness direction, and is joined in the thickness direction by a joining material (not shown in fig. 3) such as a hot-melt adhesive. That is, in the up-down direction, there is a portion where at least a part of the folded-back portion 3 overlaps with the absorbent main body 10. Thus, when the diaper 1 is worn, the edge of the upper end of the absorbent body 10 is prevented from directly contacting the skin (abdomen) of the wearer, and the wearer can hardly feel hard to the touch caused by the upper end edge of the absorbent body 10. However, the folded back portion 3 may not be provided at least partially overlapping the absorbent body 10.
As shown in fig. 3, the non-skin side sheet 2b constituting the waist portion 2 is folded back from the upper side to the lower side in the up-down direction and from the non-skin side to the skin side in the thickness direction at the back upper end 30et of the back waist portion 30, and forms a folded back portion 3. By forming the folded-back portion 3, a plurality of (3 pieces in fig. 3) sheet members are stacked in the thickness direction at the upper end portion of the back-side waistline portion 30 (other layers are formed at the upper end portion of the back-side waistline portion 30). This can improve the material strength when the diaper 1 is lifted. In fig. 3, only the non-skin side sheet 2b is folded back at the back upper end 30et of the back waist portion 30, and the skin side sheet 2a is not folded back. However, the folded-back portion 3 may be formed by folding back only the skin-side sheet 2a instead of folding back the non-skin-side sheet 2 b. The skin-side sheet 2a may be folded back together with the non-skin-side sheet 2b in the same manner as the non-skin-side sheet 2b to form the other folded-back portion 3. The non-skin side sheet 2b and the skin side sheet 2a may not be folded back at the back upper end 30et of the back side waist portion 30, and the folded back portion 3 may not be formed. By not forming the folded-back portion 3, the number of layers of the material constituting the upper end portion of the back-side waistline portion 30 can be reduced, and the air permeability can be suppressed.
As shown in fig. 2 and 3, the lower end portion of the folded-back portion 3 has a portion overlapping the upper end portion of the back side of the absorbent main body 10 when viewed in the thickness direction, and is joined in the thickness direction by a joining material (not shown in fig. 3) such as a hot-melt adhesive. That is, in the up-down direction, there is a portion where at least a part of the folded-back portion 3 overlaps with the absorbent main body 10. Thus, when the diaper 1 is worn, the edge of the upper end of the absorbent body 10 is prevented from directly contacting the skin (back) of the wearer, and the wearer can hardly feel hard to the touch caused by the upper end edge of the absorbent body 10. However, the folded back portion 3 may not be provided at least partially overlapping the absorbent body 10.
Further, although not shown, other sheet members having a portion overlapping the abdomen-side upper end portion of the absorbent body 10 when viewed in the thickness direction may be provided in the abdomen-side waist portion 20 together with the folded-back portion 3 overlapping the absorbent body 10 or in place of the folded-back portion 3 overlapping the absorbent body 10. In addition, in the back side waistline portion 30, other sheet members having a portion overlapping the back side upper end portion of the absorbent body 10 when viewed in the thickness direction may be provided together with the folded-back portion 3 overlapping the absorbent body 10 or in place of the folded-back portion 3 overlapping the absorbent body 10. These other sheet members are rectangular sheet members made of nonwoven fabric or the like, independent of the abdomen-side waistline portion 20 and the back-side waistline portion 30. Thus, when the diaper 1 is worn, the edge of the upper end of the absorbent body 10 is prevented from directly contacting the skin (abdomen or back) of the wearer, and the wearer can hardly feel hard to the touch caused by the upper edge of the absorbent body 10. However, the other sheet member may be provided only in one of the abdomen-side waist part 20 and the back-side waist part 30. In addition, other sheet members may not be provided.
As described above, the abdomen-side waist part 20 or the back-side waist part 30 has a portion where at least a part of the folded-back part 3 or at least a part of another sheet member different from the folded-back part 3 overlaps the absorbent main body 10. Thus, when the diaper 1 is worn, the edge of the upper end of the absorbent body 10 is prevented from directly contacting the skin (abdomen or back) of the wearer, and the wearer can hardly feel hard to the touch caused by the upper edge of the absorbent body 10. In the following description, a member/portion covering the upper end edge of the absorbent main body 10 in order to make it difficult for the wearer to generate a hard touch feeling caused by the upper end edge is referred to as "cover portion 5".
< Open pore 40>
Fig. 5 is a view showing a plurality of openings 40 in the schematic plan view of fig. 2. Fig. 6 is a schematic plan view of the diaper 1 in an extended and stretched state when viewed from the non-skin side.
In the present embodiment, the skin-side sheet 2a has 1 or more openings (skin-side openings 40 a), and similarly, the non-skin-side sheet 2b has 1 or more openings (non-skin-side openings 40 b). The openings 40 are openings penetrating the skin-side sheet 2a or the non-skin-side sheet 2b in the thickness direction. The plurality of openings 40 are provided on the entire surface of the skin-side sheet 2a or the non-skin-side sheet 2b in plan view, but the plurality of openings 40 may be provided in a part of the skin-side sheet 2a or the non-skin-side sheet 2 b. As shown in fig. 4, in the present embodiment, 1 or more openings 40 are also formed in the cover portion 5 (in fig. 5, the folded-back portion 3 of the non-skin-side sheet 2 b). Details of the opening 40 of the cover 5 will be described later.
< Topsheet 13>
In the present embodiment, the skin side surface of the top sheet 13 has a concave-convex shape. Specifically, the concave portion 13a recessed toward the non-skin side is provided on the skin side surface of the top sheet 13, thereby forming a concave-convex shape. Hereinafter, two examples (examples 1 and 2) will be described with respect to the concave-convex shape formed in the top sheet 13.
1 St example
Fig. 7A is a schematic perspective view of example 1 of the skin side surface of the top sheet 13.
In example 1 of the skin side surface of the top sheet 13, the concave portions 13a and the convex portions 13b are alternately arranged in the left-right direction (lateral direction), that is, the concave portions 13a and the convex portions 13b are arranged at intervals in the left-right direction (lateral direction), so that the uneven shape is formed on the skin side surface of the top sheet 13. The concave portion 13a is a portion recessed toward the non-skin side. The convex portion 13b is a portion protruding toward the skin. In example 1 shown in fig. 7A, the concave portion 13a and the convex portion 13b are provided so as to extend in the up-down direction (longitudinal direction) of the top sheet 13. The concave portion 13a is formed by compressing the top sheet 13 from one side (here, the skin side) to the other side (here, the non-skin side) in the thickness direction by a known compression means such as embossing. However, the concave portion 13a may be formed by a method other than embossing or the like. In addition, a plurality of concave portions 13a are formed in the vertical direction (longitudinal direction) along the left-right direction (transverse direction) of the top sheet 13. In example 1 of the skin side surface of the top sheet 13, a flow path through which air in the diaper 1 flows in the up-down direction (longitudinal direction) is formed along the concave portion 13a.
2 Nd example
Fig. 7B is a schematic perspective view of example 2 of the skin side surface of the top sheet 13.
In example 2 of the skin side surface of the top sheet 13, a plurality of concave portions 13a along the up-down direction (longitudinal direction) are formed along the left-right direction (transverse direction) of the top sheet 13, and a plurality of concave portions 13a along the left-right direction (transverse direction) are formed along the up-down direction (longitudinal direction) of the top sheet 13. Thus, a plurality of protruding portions 13b are formed in the left-right direction (lateral direction), and a plurality of protruding portions are also formed in the up-down direction (longitudinal direction). In example 2 of the skin side surface of the top sheet 13, a flow path through which air in the diaper 1 flows in the up-down direction (longitudinal direction) is also formed along the concave portion 13 a.
Cover 5 of comparative example
As described above, in order to make it difficult for the wearer to generate a hard touch feeling caused by the upper end edge of the absorbent main body 10 (top sheet 13), the upper end edge is covered with the cover portion 5. At this time, in the case of the top sheet 13 in which the concave portion 13a is formed along the up-down direction (longitudinal direction) as shown in fig. 7A and 7B, a part of the top sheet 13 on the upper end edge side of the concave portion 13a is covered with the cover portion 5. At this time, the air flowing through the concave portion 13a may be covered with the cover portion 5, and thus may be difficult to be discharged to the outside of the diaper 1.
Cover 5 of the present embodiment
In contrast, in the diaper 1 of the present embodiment, as shown in fig. 4, in the absorbent main body 10 including the top sheet 13 having the concave portion 13a (not shown in fig. 4) along the up-down direction (longitudinal direction), the cover portion 5 of the waist portion 2 covers the upper end edge (one end in the longitudinal direction) of the absorbent main body 10 from the skin side. In this case, the concave portion 13a (top sheet 13) includes a portion (portion X shown in fig. 4) covered by the cover portion 5 from the skin side and a portion (portion Y shown in fig. 4) uncovered by the cover portion 5 from the skin side. In the extended state, an opening 40 is provided in a portion (portion X shown in fig. 4) of the cover portion 5 covering the concave portion 13a from the skin side in the up-down direction (longitudinal direction).
According to the diaper 1 of the present embodiment, air in the diaper 1 flows upward with the concave portion of the top sheet 13 as a flow path, and is discharged from the non-skin side to the skin side through the opening 40 provided in the cover portion 5. This can improve the breathability of the diaper 1.
< Arrangement of elastic members 23, 33 >
As shown in fig. 2, elastic members 23, 33 that can expand and contract in the lateral direction are arranged in the waist portion 2 (the abdomen-side waist portion 20 and the back-side waist portion 30) in the lateral direction. In the present embodiment, as shown in fig. 2, when viewed in the thickness direction, the elastic members 23, 33 partially overlap the cover portion 5 (in fig. 2, the folded-back portion 3 of the non-skin-side sheet 2 b). Accordingly, wrinkles extending in the longitudinal direction due to the elastic members 23 and 33 are formed in the cover 5, and a flow path through which air in the diaper 1 flows is also formed between the cover 5 and the skin. Thus, the air in the diaper 1 flowing upward with the concave portion of the top sheet 13 as a flow path is discharged from the opening 40 provided in the cover 5 to the skin side from the non-skin side, and then discharged from the flow path formed by forming the wrinkles to the outside of the diaper 1. Thus, when viewed in the thickness direction, the elastic members 23, 33 partially overlap the cover 5, and the breathability in the diaper 1 can be further improved. However, the elastic members 23 and 33 may not overlap the cover 5.
In the present embodiment, as shown in fig. 2, the elastic members 23 and 33 are arranged so as not to overlap the absorbent core 11 when viewed in the thickness direction. This can suppress the influence of the rigidity of the absorbent core 11 on the contraction of the elastic members 23, 33. Thus, wrinkles extending in the longitudinal direction due to the elastic members 23, 33 can be easily formed in the cover portion 5. Further, by disposing the elastic members 23, 33 so as not to overlap the absorbent core 11, formation of wrinkles in the absorbent core 11 can be suppressed, and thereby, degradation of the absorption performance of the absorbent core 11 can be suppressed. But it may also be configured that at least a part of the elastic members 23, 33 overlaps the absorbent core 11.
In the present embodiment, the elastic members 23 and 33 disposed on the lower side (crotch side) of the waist portion 2 are stretched by a unit length larger than the elastic members 23 and 33 disposed on the upper side (waist opening side) of the waist portion 2. This facilitates forming a flow path for air to flow by forming wrinkles in the waist portion 2. This makes it possible to make air flow in the diaper 1 easier. However, the elastic members 23 and 33 disposed on the lower side (crotch side) and the elastic members 23 and 33 disposed on the upper side (waist opening side) may not be provided as described above.
In the present embodiment, the force for extending the elastic member 33 provided on the back side and overlapping the cover 5 by a unit length is larger than the force for extending the elastic member 23 provided on the abdomen side and overlapping the cover 5 by a unit length. This facilitates forming a flow path for air to flow by forming wrinkles in the waist portion 2. This makes it possible to facilitate the flow of air in the diaper 1. The elastic members 23, 33 may not be provided as described above.
< Arrangement of cover 5 (opening 40) >)
In the present embodiment, as shown in fig. 5, the openings 40 of the cover portion 5 (in fig. 5, the folded-back portion 3 of the non-skin-side sheet 2 b) are provided so as not to overlap the absorbent core 11 when viewed in the thickness direction. This suppresses the moisture absorbed by the absorbent core 11 from returning to the skin side through the openings 40. Thus, the uncomfortable feeling of the wearer due to rewet can be reduced. However, the openings 40 of the cover 5 may overlap the absorbent core 11 when viewed in the thickness direction.
In the present embodiment, as shown in fig. 5, the cover portion 5 (in fig. 5, the folded-back portion 3 of the non-skin-side sheet 2 b) covers the upper end edge (one end in the longitudinal direction) of the absorbent main body 10 from the skin side so as not to overlap the absorbent core 11, as seen in the thickness direction. This suppresses the moisture absorbed by the absorbent core 11 from returning to the wearer along the cover 5. Thus, the uncomfortable feeling of the wearer due to rewet can be reduced.
< Protruding portion 50>
Fig. 8 is a schematic cross-sectional view of the top sheet 13 having the concave portion 13a and the cover portion 5 having the opening 40.
The top sheet 13 is provided with a plurality of compressed portions 14 on its surface. The compression portion 14 is formed by compressing the top sheet 13 from one side (here, the skin side) to the other side (here, the non-skin side) in the thickness direction by a known compression means such as embossing. The fiber density of the top sheet 13 is locally increased and the rigidity is increased at the portion compressed by the compressing portion 14. By providing the compression portion 14, the top sheet 13 is formed in a concave-convex shape as also shown in fig. 7A and 7B. Here, as shown in fig. 8, the convex portion 13b is a portion protruding to one side in the thickness direction (here, the skin side), and is a region where the thickness of the top sheet 13 is thickest when viewed in the cross section shown in fig. 8. As shown in fig. 8, the concave portions 13a are regions provided between adjacent concave portions 13 b.
In the present embodiment, the hole 40 is formed by penetrating the pin through the cover 5. Therefore, a protruding portion 50 is formed on the edge portion of the hole 40 on the opposite side to the insertion side of the pin, as shown in fig. 8. The protruding portion 50 is a so-called burr. The protruding portion 50 is formed to have a higher density than the surrounding area of the opening 40 when viewed in the thickness direction. In the present embodiment, as shown in fig. 8, the protruding portion 50 provided at the edge of the opening 40 protrudes toward the non-skin side. By providing the protruding portion 50 which is a region formed to have a higher density than the region around the aperture 40, even when the moisture absorbed by the absorbent core 11 flows along the cover portion 5, a certain degree of moisture can be maintained in the high-density region. Thus, the uncomfortable feeling of the wearer due to rewet can be reduced. The protruding portion 50 may protrude in a direction other than the direction shown in fig. 8. In addition, the protruding portion 50 may not be provided.
In the present embodiment, the pitch at which the plurality of openings 40 are arranged is smaller than the pitch at which the plurality of recesses 13a are arranged in the lateral direction shown in fig. 8. Here, the pitch at which the plurality of openings 40 are arranged is the length of the centers of the adjacent openings 40 in the lateral direction shown in fig. 8. The pitch at which the plurality of concave portions 13a are arranged is the length between the centers of adjacent concave portions 13a in the lateral direction shown in fig. 8. Thus, the opening 40 of the cover 5 is disposed in both the concave portion 13a of the top sheet 13 and a portion other than the concave portion 13a of the top sheet 13 (here, the convex portion 13 b) when viewed in the thickness direction. This can further improve the breathability of the diaper 1.
However, in the lateral direction shown in fig. 8, the pitch at which the plurality of openings 40 are arranged may be larger than the pitch at which the plurality of recesses 13a are arranged. Thus, the number of openings 40 in the cover portion 5 that cover the portion of the recess 13a is reduced. This can improve the material strength of the diaper 1 while ensuring breathability.
< Bonding portion of absorbent Main body 10 and waist portion 2 >
Fig. 9A is a schematic plan view showing the inner side bonded portion 90 and the inner side non-bonded portion 91. Fig. 9B is a schematic cross-sectional view of line A-A of fig. 9A.
As shown in fig. 9A, the absorbent main body 10 and the waist portion 2 (the skin-side sheet 2a in fig. 9A) are joined together by a joining material (the inner-side adhesive portion 90) such as a hot-melt adhesive. As shown in fig. 9A, the inner adhesive portion 90 is provided along the up-down direction (longitudinal direction). In addition, a plurality of the inner side adhesive portions 90 provided in the vertical direction (longitudinal direction) in this manner are arranged in the lateral direction. Thereby, a flow path for air is also formed longitudinally between the absorbent body 10 and the waistline portion 2. Thereby, a ventilation path in the longitudinal direction of the diaper 1 is easily formed. However, the inner side adhesive portion 90 may not be arranged as shown in fig. 9A.
As shown in fig. 9B, a plurality of inner side adhesive portions 90 are arranged in the lateral direction, and thus an inner side non-adhesive portion 91 where the inner side adhesive portions 90 are not formed is provided on the skin side of the skin side sheet 2 a. The plurality of inner non-adhesive portions 91 are arranged in the lateral direction. Further, in the lateral direction, the pitch PA at which the plurality of skin-side apertures 40a of the skin-side sheet 2a are arranged is smaller than the pitch PB at which the plurality of inner-side non-adhesive portions 91 are arranged (PA < PB). Here, the pitch PA at which the plurality of skin-side openings 40a are arranged is a length between predetermined positions of adjacent skin-side openings 40a when the plurality of skin-side openings 40a of the same size and shape are continuous in a certain direction. The pitch PB at which the plurality of inner non-adhesive portions 91 are arranged is a length between predetermined positions of adjacent inner non-adhesive portions 91 when the plurality of inner non-adhesive portions 91 of the same size are continuous in a certain direction. In fig. 9B, the pitch PA at which the plurality of skin-side apertures 40a are arranged is the length between the centers of the adjacent skin-side apertures 40a, and the pitch PB at which the plurality of inner-side non-adhesive portions 91 are arranged is the length between the centers of the adjacent inner-side non-adhesive portions 91. Thereby, a flow path is formed in which air in the diaper 1 flows through the skin-side opening 40. This can further improve the breathability of the diaper 1. However, the pitch PA at which the plurality of skin-side apertures 40a of the skin-side sheet 2a are arranged may be equal to or greater than the pitch PB at which the plurality of inner non-adhesive portions 91 are arranged.
< Bonding portion of cover portion 5 and absorbent body 10 >
Fig. 10A is a schematic plan view showing the cover-side bonded portion 92 and the cover-side non-bonded portion 93. Fig. 10B is a schematic cross-sectional view of line A-A of fig. 10A.
As shown in fig. 10A, the cover 5 and the absorbent body 10 are bonded to each other with a bonding material (cover-side bonding portion 92) such as a hot melt adhesive. As shown in fig. 10A, the cover-side adhesive portion 92 is provided along the up-down direction (longitudinal direction). In addition, a plurality of cover-side adhesive portions 92 provided in the vertical direction (longitudinal direction) in this manner are arranged in the lateral direction. However, the cover-side adhesive portion 92 may not be arranged as shown in fig. 10A.
As shown in fig. 10B, a plurality of cover-side adhesive portions 92 are arranged in the lateral direction, and cover-side non-adhesive portions 93 are provided that do not fix the cover 5 to the absorbent main body 10. The opening 40 (opening 40s shown in fig. 10B) overlaps the cover-side non-adhesive portion 93 when viewed in the thickness direction. Thus, the air in the diaper 1 flows through the concave portion 13a of the top sheet 13 as a flow path, and is discharged through the openings 40s provided in the region overlapping the cover-side non-bonded portion 93. This can improve the breathability of the diaper 1.
As shown in fig. 10A and 10B, the other openings 40 (openings 40t shown in fig. 10B) overlap the cover-side adhesive portion 92 when viewed in the thickness direction. Thus, the plurality of openings 40 of the cover 5 have both openings 40 (openings 40t shown in fig. 10B) overlapping the bonded portions bonded to the absorbent body 10 and openings 40 (openings 40s shown in fig. 10B) not overlapping the bonded portions bonded to the absorbent body 10. Thus, the material strength can be improved while the air permeability is ensured. However, the plurality of openings 40 of the cover 5 may have only any one of the openings 40 (the openings 40t shown in fig. 10B) overlapping the bonded portions bonded to the absorbent body 10 or the openings 40 (the openings 40s shown in fig. 10B) not overlapping the bonded portions bonded to the absorbent body 10.
Although not shown, at least a portion of the opening 40 of the cover 5 overlaps at least a portion of the skin-side opening 40a when viewed in the thickness direction. Thereby, a ventilation opening is formed in the thickness direction of the diaper 1. This can further improve the breathability of the diaper 1.
= = Other embodiments= = = =
The embodiments of the present invention have been described above, but the embodiments are made to facilitate understanding of the present invention, and are not intended to limit the present invention. The present invention is capable of modification and improvement without departing from the spirit thereof, and naturally includes equivalents thereof.

Claims (15)

1. An absorbent article having a longitudinal direction, a transverse direction, and a thickness direction intersecting each other, the absorbent article comprising:
an absorbent body, and
A waist portion disposed on the waist of the wearer, wherein,
The absorbent body includes:
an absorbent core, and
A top sheet disposed closer to the skin than the absorbent core, the top sheet having a recess recessed toward the non-skin side and forming a flow path along the longitudinal direction for air flow in the absorbent article,
The waist portion includes a cover portion covering an end of the absorbent main body on one side in the longitudinal direction from a skin side,
The concave portion includes a portion covered by the cover portion from the skin side and a portion uncovered by the cover portion from the skin side,
In the extended state of the device,
In the longitudinal direction, an opening is provided in a portion of the cover portion that covers the concave portion from the skin side.
2. The absorbent article of claim 1, wherein the absorbent article comprises,
An elastic member that can expand and contract in the lateral direction is arranged in the waistline portion in the lateral direction,
At least a part of the elastic member overlaps the cover portion when viewed in the thickness direction.
3. The absorbent article of claim 2, wherein the absorbent article comprises,
The elastic member is arranged so as not to overlap the absorbent core when viewed in the thickness direction.
4. The absorbent article as set forth in any one of claims 1 to 3, wherein,
The opening of the cover portion is disposed so as not to overlap the absorbent core when viewed in the thickness direction.
5. The absorbent article as in claim 4, wherein,
The cover portion does not overlap the absorbent core when viewed in the thickness direction.
6. The absorbent article as in claim 4, wherein,
The cover portion includes a region provided on an edge portion of the aperture toward the non-skin side and formed to have a higher density than a region surrounding the aperture.
7. The absorbent article as claimed in claim 2 or 3, characterized in that,
An opening-side elastic member is further disposed on the waist opening side of the waist portion in the longitudinal direction of the waist portion than the elastic member,
The force for elongating the elastic member by a unit length is larger than the force for elongating the opening-side elastic member by the unit length.
8. The absorbent article as claimed in claim 2 or 3, characterized in that,
The cover part comprises a back cover part arranged on the back side and a belly cover part arranged on the belly side,
The elastic member includes a back-side elastic member disposed on a back side of the waist portion and having at least a portion overlapping the back-side cover portion, and a abdomen-side elastic member disposed on an abdomen side of the waist portion and having at least a portion overlapping the abdomen-side cover portion,
The force for elongating the back side elastic member by a unit length is larger than the force for elongating the abdomen side elastic member by the unit length.
9. The absorbent article as set forth in any one of claims 1 to 3, wherein,
The top sheet has other recesses in the lateral direction at positions different from those of the recesses,
In the longitudinal direction, the portion of the cover portion covering the concave portion from the skin side is provided with other openings at positions different from the openings in the lateral direction,
In the lateral direction, the pitch of the openings and the other openings is smaller than the pitch of the recesses and the other recesses.
10. The absorbent article as set forth in any one of claims 1 to 3, wherein,
The top sheet has other recesses in the lateral direction at positions different from those of the recesses,
In the longitudinal direction, the portion of the cover portion covering the concave portion from the skin side is provided with other openings at positions different from the openings in the lateral direction,
In the lateral direction, the pitch of the openings and the other openings is larger than the pitch of the recesses and the other recesses.
11. The absorbent article as set forth in any one of claims 1 to 3, wherein,
A plurality of inner side adhesive parts for fixing the absorbent body and the waist part by using an adhesive are arranged along the transverse direction.
12. The absorbent article as in claim 11, wherein,
The waist part is provided with a skin side sheet provided with a plurality of inner side adhesive parts on the skin side and a plurality of skin side openings,
A plurality of inner non-adhesive parts which do not form the inner adhesive parts are arranged on the skin side of the skin side sheet along the transverse direction,
In the lateral direction, the pitch at which the plurality of skin-side apertures are arranged is smaller than the pitch at which the plurality of inner-side non-adhesive portions are arranged.
13. The absorbent article as set forth in any one of claims 1 to 3, wherein,
The absorbent article has a cover-side adhesive portion for fixing the cover portion to the absorbent body by an adhesive and a cover-side non-adhesive portion for not fixing the cover portion to the absorbent body,
The opening overlaps the cover-side non-adhesive portion when viewed in the thickness direction.
14. The absorbent article as set forth in claim 13 wherein,
In the longitudinal direction, the portion of the cover portion covering the concave portion from the skin side is provided with other openings at positions different from the openings in the lateral direction,
The other openings overlap the cover-side bonding portion when viewed in the thickness direction.
15. The absorbent article as set forth in any one of claims 1 to 3, wherein,
The waist part has a skin side sheet having skin side openings and a non-skin side sheet provided on a non-skin side of the skin side sheet,
At least a part of the opening of the cover portion overlaps at least a part of the skin-side opening when viewed in the thickness direction.
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