CN111683634A - Absorbent article - Google Patents

Absorbent article Download PDF

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Publication number
CN111683634A
CN111683634A CN201880088657.4A CN201880088657A CN111683634A CN 111683634 A CN111683634 A CN 111683634A CN 201880088657 A CN201880088657 A CN 201880088657A CN 111683634 A CN111683634 A CN 111683634A
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CN
China
Prior art keywords
heat
portions
longitudinal direction
width direction
excrement
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Granted
Application number
CN201880088657.4A
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Chinese (zh)
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CN111683634B (en
Inventor
山本纯子
高阪翔士
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Unicharm Corp
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Unicharm Corp
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Publication of CN111683634A publication Critical patent/CN111683634A/en
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Publication of CN111683634B publication Critical patent/CN111683634B/en
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    • 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
    • A61F13/47—Sanitary towels, incontinence pads or napkins
    • A61F13/475—Sanitary towels, incontinence pads or napkins characterised by edge leakage prevention means
    • A61F13/4751—Sanitary towels, incontinence pads or napkins characterised by edge leakage prevention means the means preventing fluid flow in a transversal direction
    • A61F13/4756—Sanitary towels, incontinence pads or napkins characterised by edge leakage prevention means the means preventing fluid flow in a transversal direction the means consisting of grooves, e.g. channels, depressions or embossments, resulting in a heterogeneous surface level
    • 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
    • A61F13/47—Sanitary towels, incontinence pads or napkins
    • A61F13/475—Sanitary towels, incontinence pads or napkins characterised by edge leakage prevention means
    • 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 articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/494—Absorbent articles specially adapted to be worn around the waist, e.g. diapers characterised by edge leakage prevention means
    • 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
    • A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
    • 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
    • A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
    • A61F13/51104—Topsheet, i.e. the permeable cover or layer facing the skin the top sheet having a three-dimensional cross-section, e.g. corrugations, embossments, recesses or projections
    • 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
    • A61F13/53—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
    • A61F13/531—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 a homogeneous composition through the thickness of the pad
    • A61F13/532—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 a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad
    • 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
    • A61F13/531—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 a homogeneous composition through the thickness of the pad
    • A61F13/532—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 a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad
    • A61F13/533—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 a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad having discontinuous areas of compression
    • 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
    • A61F13/534—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 an inhomogeneous composition through the thickness of the pad
    • A61F13/537—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 an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
    • A61F13/53708—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 an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer the layer having a promotional function on liquid propagation in at least one direction
    • A61F13/53717—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 an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer the layer having a promotional function on liquid propagation in at least one direction the layer having a promotional function on liquid propagation in the horizontal direction
    • 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
    • A61F13/539—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 characterised by the connection of the absorbent layers with each other or with the outer layers
    • 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
    • A61F13/539—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 characterised by the connection of the absorbent layers with each other or with the outer layers
    • A61F2013/53908—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 characterised by the connection of the absorbent layers with each other or with the outer layers with adhesive
    • A61F2013/53925—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 characterised by the connection of the absorbent layers with each other or with the outer layers with adhesive with intermittent pattern, e.g. spots
    • 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
    • A61F13/539—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 characterised by the connection of the absorbent layers with each other or with the outer layers
    • A61F2013/5395—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 characterised by the connection of the absorbent layers with each other or with the outer layers with thermoplastic agent, i.e. softened by heat

Abstract

Provided is an absorbent article having a pair of embossed sections, wherein an absorbent body can be used as a whole with high efficiency. The absorbent body (4) of the absorbent article comprises a super absorbent polymer and a heat-fusible fiber. The absorbent article has a pair of embossed portions (5, 5) arranged at intervals in the width direction. Each embossed section extends in the longitudinal direction, is recessed in the thickness direction from the skin-side surface of the top sheet (2) toward the non-skin-side surface of the absorbent body, and includes a plurality of heat-fused sections (5t) intermittently arranged in the longitudinal direction. The heat fusion part does not contain pulp fibers. The super absorbent polymer is present at least in a region between the heat-welded parts adjacent in the longitudinal direction among the plurality of heat-welded parts.

Description

Absorbent article
Technical Field
The present invention relates to an absorbent article.
Background
An absorbent article is known which includes a topsheet and an absorbent body positioned on the non-skin side of the topsheet, and which has a pair of embossed portions arranged at intervals in the width direction. For example, patent document 1 discloses an absorbent article including a topsheet and an absorbent body (absorbent sheet) positioned on the non-skin side of the topsheet, and having a pair of embossed portions arranged at intervals in the width direction. Each embossed portion is provided to extend continuously in the longitudinal direction and has a shape recessed in the thickness direction from the skin-side surface of the topsheet toward the non-skin-side surface of the absorbent member (absorbent sheet).
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2017-158654
Disclosure of Invention
Problems to be solved by the invention
In the absorbent article described in patent document 1, a thermally embossed portion may be used as the embossed portion. The embossed section is formed by heat-welding the topsheet and the absorbent body while being pressed. However, when fibers having no thermal adhesiveness, such as pulp fibers, are included in the top sheet or the absorbent body, the adhesive strength of the embossed portion may decrease. Therefore, by providing the embossed portion so as to extend continuously in the longitudinal direction, the bonding strength of the entire embossed portion can be increased, and the separation of the thermally fused portion of the embossed portion can be suppressed. The pair of embossed sections can allow excrement (for example, urine) reaching the embossed sections directly from above or through the surface of the surface sheet to flow forward and backward in the longitudinal direction through the dimples of the embossed sections continuously extending in the longitudinal direction. However, since the thermal embossing portion is formed by melting and solidifying the fibers by heat, the liquid cannot penetrate and diffuse inside. Therefore, the excrement is less likely to spread from the region between the pair of embossed portions to the region outside in the width direction beyond each embossed portion. Therefore, when the excrement is absorbed in the region between the pair of embossed portions in the absorbent body, the excrement spreads outward in the width direction in the absorbent body, but is blocked by the pair of embossed portions and is substantially less likely to spread to the absorbent body outside the pair of embossed portions. Therefore, it is difficult to sufficiently absorb excrement in the portions of the absorbent body located outside the pair of embossed portions in the width direction, and it is difficult to effectively use the absorbent body.
Accordingly, an object of the present invention is to provide an absorbent article having a pair of embossed portions, in which an absorber can be used efficiently as a whole.
Means for solving the problems
The absorbent article of the present invention is as follows. (1) An absorbent article having a longitudinal direction, a width direction, and a thickness direction, and comprising a topsheet and an absorbent body positioned on the non-skin side of the topsheet, characterized in that the absorbent body comprises a super absorbent polymer and a heat-fusible fiber, the absorbent article has a pair of embossed sections arranged at intervals in the width direction, the pair of embossed sections are respectively arranged to extend in the longitudinal direction, and is recessed from the skin-side surface of the surface sheet toward the non-skin-side surface of the absorber in the thickness direction, the pair of embossed portions includes a plurality of heat-fusion portions intermittently arranged along the longitudinal direction, the plurality of heat-fusion portions do not contain pulp fibers, and the super absorbent polymer is present at least in a region between the heat-fusion portions adjacent in the longitudinal direction among the plurality of heat-fusion portions.
In the absorbent article of the present invention, the pair of embossed portions may have a plurality of heat-fused portions arranged intermittently in the longitudinal direction, and each of the heat-fused portions may not contain pulp fibers.
In this way, the heat-fused portion is formed without including pulp fibers, which are absorbent materials that are difficult to heat-fuse, and therefore, the bonding strength by the heat-fused portion can be enhanced. That is, even if the heat fusion bonded portion (heat embossed portion) is not formed continuously along the longitudinal direction, the heat fusion bonded portion can be in a state of being difficult to be peeled. Therefore, since it is not necessary to form the heat-fused portions continuously in a groove shape along the longitudinal direction, the excrement can be diffused widely to the outer side of the pair of embossed portions through the regions between the plurality of heat-fused portions formed intermittently.
When excrement is discharged to the vicinity of the center portion of the absorbent article and spreads at substantially the same speed in the width direction and the longitudinal direction in the absorbent body, the excrement easily reaches the pair of embossed portions in the width direction. Therefore, in the width direction, at the initial stage of the absorption of the excrement by the absorbent body, for example, at the time of the 1 st absorption of the excrement, the excrement spreading in the width direction can be blocked by the heat-fusion portions, and the excrement can be guided to the region between the adjacent heat-fusion portions. That is, the excrement can be made to flow through the region between the adjacent heat-fused portions where the super absorbent polymer exists. Further, the excrement flowing through the region between the adjacent heat-fused portions can be guided to the absorbent body on the outer side in the width direction W than the pair of embossed portions. This allows the outer absorbent body to absorb the excrement.
At this time, as the excrement flows through the region between the adjacent heat-fused portions, the superabsorbent polymer present in the region between the adjacent heat-fused portions absorbs the excrement and gradually swells, and then the region between the adjacent heat-fused portions is closed to make the excrement difficult to flow.
Therefore, when the absorbent body absorbs excrement later, for example, the 2 nd order of excrement absorption, the excrement is blocked by the high-absorbent polymer in the regions between the plurality of fusion-bonded parts and the adjacent fusion-bonded parts, and does not spread outward in the width direction from the pair of embossed parts. This allows the excrement to be diffused forward and backward in the longitudinal direction with a margin for absorption. Further, the excrement can be prevented from being excessively diffused to the outside in the width direction than the pair of embossed portions and leaking to the outside in the width direction.
Therefore, the excrement can be absorbed over a wide range in the width direction and the longitudinal direction. This enables efficient use of the absorber as a whole. In addition, even when the amount of excrement is large, for example, a large number of excretions are excreted, it is possible to prevent the excrement from leaking because of incomplete absorption.
The absorbent article of the present invention may be the absorbent article according to the above (1), (2) the distance between adjacent ones of the plurality of heat-fused portions is 0.5mm or more and 5mm or less, and the basis weight of the super absorbent polymer between the adjacent heat-fused portions is 20g/m2Above and 80g/m2The following.
In the absorbent article of the present invention, the distance between the heat-fused parts is 0.5mm to 5mm, and the basis weight of the absorbent polymer is 20g/m2Above and 80g/m2The following. That is, the super absorbent polymer having a predetermined basis weight is disposed in the region between the predetermined heat-fusion bonded portions. This enables the excrement to flow through the adjacent heat-fused portions at an initial stage, and thereafter the excrement can be blocked by the swollen super absorbent polymer.
The absorbent article of the present invention may be the absorbent article according to the above (1) or (2), wherein (3) the length of each of the pair of embossed portions in the longitudinal direction is 30% or more and 80% or less of the length of the absorbent body in the longitudinal direction.
In the absorbent article of the present invention, the length of each embossed portion in the longitudinal direction is 30% to 80% of the length of the absorbent body in the longitudinal direction. Therefore, the thermally fused portions can more reliably block the spread of excrement in the width direction and guide the excrement to the region between the adjacent thermally fused portions.
The absorbent article of the present invention may be the absorbent article according to any one of the above (1) to (3), (4) in the pair of heat embossed portions, a distance in the width direction between the center portions in the longitudinal direction may be shorter than a distance in the width direction between the end portions in the longitudinal direction.
In the absorbent article of the present invention, the distance between the longitudinal center portions of the pair of heat embossed portions is shorter than the distance between the longitudinal end portions. That is, the pair of embossed portions has a shape in which the longitudinal center portion is narrowed inward. Therefore, the area of the region inside the pair of embossed portions can be relatively narrowed at the center portion in the longitudinal direction, and the area of the inside of the pair of embossed portions can be relatively enlarged at the end portions in the longitudinal direction. In other words, the amount of excrement that can be absorbed by the center portion in the longitudinal direction of the absorbent body can be relatively reduced, and the amount of excrement that can be absorbed by the end portions in the longitudinal direction can be relatively increased. Here, the central portion in the longitudinal direction substantially corresponds to the drain port contact region. Therefore, the excreted excrement can be prevented from staying in the central portion and can be easily spread toward the end portions in the longitudinal direction.
The absorbent article of the present invention may be the absorbent article according to any one of the above (1) to (4), (5) further comprising a pair of other embossed portions arranged at intervals in the longitudinal direction, each of the pair of other embossed portions extending in the width direction and recessed in the thickness direction from the skin-side surface of the topsheet toward the non-skin-side surface of the absorbent body, each of the pair of other embossed portions including a plurality of other heat-fused portions arranged intermittently in the width direction, the plurality of other heat-fused portions not including pulp fibers, the high-absorbent polymer being present at least in a region between the other heat-fused portions adjacent in the width direction among the plurality of other heat-fused portions.
In the absorbent article, the pair of other embossed portions have a plurality of other heat-fused portions arranged intermittently in the width direction, and each of the other heat-fused portions does not contain pulp fibers.
In this way, the other heat-fusion bonded parts are formed without including pulp fibers, which are absorbent materials that are difficult to heat-fuse, and therefore the bonding strength by the other heat-fusion bonded parts can be enhanced. That is, even if another heat-fused portion (another heat-embossed portion) is not continuously formed in the width direction, the heat-fused portion can be in a state of being difficult to be peeled.
In addition, in the longitudinal direction, for example, when the absorbent body absorbs the excrement for the 2 nd time, the excrement spreading in the longitudinal direction can be blocked at the position of the other heat-fused portions, and the excrement can be guided to the region between the adjacent other heat-fused portions. That is, the excrement can be made to flow through the region between the adjacent other heat-fused portions where the super absorbent polymer exists. Further, the excrement flowing through the region between the other adjacent heat-fused portions can be guided to the absorbent body located outside the pair of other embossed portions in the longitudinal direction L. This allows the outer absorbent body to absorb the excrement.
At this time, as the excrement flows through the region between the adjacent other heat-fused portions, the super absorbent polymer present in the region between the adjacent other heat-fused portions absorbs the excrement and gradually swells, and then the region between the adjacent other heat-fused portions is closed to make the excrement difficult to flow.
Therefore, when the excrement is absorbed by the absorbent body later, for example, the 3 rd order excrement absorption, the excrement is blocked by the superabsorbent polymer in the region between the plurality of other heat-fused portions and the adjacent other heat-fused portions, and does not spread to the outside in the longitudinal direction than the pair of other heat-embossed portions. This allows the excrement to be diffused in both ends in the width direction of the front and rear in the longitudinal direction of the absorbent article having a margin. Further, the excrement can be prevented from being excessively diffused to the outside in the longitudinal direction than the pair of other embossed portions and leaking to the outside in the longitudinal direction. Therefore, the excrement can be absorbed over the entire width and length directions.
The absorbent article of the present invention may be the absorbent article according to (5) above, and (6) the pair of other embossed portions may have a length in the width direction of 10% or more and 70% or less of a length in the width direction of the absorbent body.
In the absorbent article, the length of each of the other embossed sections in the width direction is 10% to 70% of the length of the absorbent body in the width direction. Therefore, the excrement can be guided to the region between the adjacent other heat-fused portions while blocking the diffusion of the excrement in the longitudinal direction more reliably by the other heat-fused portions.
The absorbent article of the present invention may be the absorbent article according to the above (5) or (6), wherein (7) in the pair of other heat-embossed portions, the distance in the longitudinal direction between the widthwise central portions is longer than the distance in the longitudinal direction between the widthwise end portions.
In the absorbent article of the present invention, the distance between the widthwise central portions is longer than the distance between the widthwise end portions in the pair of heat-embossed portions. That is, the pair of other embossed portions have a shape in which the widthwise central portion bulges outward. Therefore, the area of the inner side of the pair of other embossed portions can be enlarged in the center portion in the width direction. In other words, the amount of excrement that can be absorbed by the widthwise central portion of the absorber can be increased. Therefore, the excreted excrement is more likely to spread toward the end in the longitudinal direction.
The absorbent article of the present invention may be the absorbent article according to any one of the above (1) to (7), (8) in the absorbent body, the basis weight of the super absorbent polymer in a region existing between adjacent heat-fused portions may be higher than the basis weight of the super absorbent polymer in a region other than the region.
In the absorbent article of the present invention, the basis weight of the super absorbent polymer in the region of the absorbent body between the heat-fused portions is higher than the basis weight of the super absorbent polymer in the other regions. Therefore, when the excrement is blocked by the swollen super absorbent polymer, the excrement can be blocked more reliably. Further, when the super absorbent polymer blocks excrement and further absorbs excrement while diffusing the excrement in the longitudinal direction (width direction), and swells, the heat-welded part cannot completely receive the force of swelling, and finally the heat-welded part is peeled off. Therefore, the excrement can be diffused again in the width direction (or the longitudinal direction) through the heat-fused portion. Thus, even in a region of the absorbent body which does not absorb excrement due to the blocking of the super absorbent polymer, the blocking becomes weak and excrement can flow into the region, and excrement can be absorbed in the region of the absorbent body.
The absorbent article of the present invention may be the absorbent article according to any one of the above (1) to (8), (9) the heat-fused portion may have a rectangular shape in plan view,
the rectangle is arranged such that a 1 st edge of the rectangle is along the longitudinal direction and a 2 nd edge adjacent to the 1 st edge is along the width direction, a ratio of the 1 st edge to the 2 nd edge is 1: 0.7-1: 1.3.
in the absorbent article, the heat-fused portion has an aspect ratio of 1: 0.7-1: 1.3 rectangular shape. Therefore, the excrement spreading outward in the width direction can be blocked more reliably by the surface forming the 1 st edge, that is, the surface substantially perpendicular to the width direction. In addition, the super absorbent polymer swollen by absorbing the excrement can be held so as not to move in the excrement so as to be sandwiched from both sides by the surface forming the 2 nd side, that is, the surface substantially along the width direction.
The absorbent article of the present invention may be the absorbent article of any one of (1) to (9) above, and (10) the heat-fused portion may have an area of 0.5mm in plan view2Above and 5mm2The following.
In the absorbent article, the heat-fused part has a thickness of 0.5mm in a plan view2Above and 5mm2The following area. Therefore, the heat-fused portion can reliably block excrement spreading outward in the width direction, and the superabsorbent polymer swollen by absorbing excrement can be held so as not to move in the excrement.
The absorbent article of the present invention may be the absorbent article according to any one of (1) to (10) above, wherein (11) the heat-fusion bonded portion has an adhesive strength of 0.05N/25mm or more and 1N/25mm or less.
In the absorbent article, the adhesive strength of the heat-fused part is 0.05N/25mm or more and 1N/25mm or less. Therefore, the heat-fused portions do not peel off during the initial swelling of the super absorbent polymer, and the swollen super absorbent polymer can block excrement spreading in the width direction between adjacent heat-fused portions. This allows the excrement to be diffused in the longitudinal direction. Further, if the swelling of the super absorbent polymer progresses to a certain extent, the force of swelling cannot be fully received, and finally the heat-fused part is peeled off. This allows the excrement to be diffused again in the width direction through the heat-fused portion. Thus, even in a region of the absorbent body which does not absorb excrement due to the blocking of the super absorbent polymer, the blocking becomes weak and excrement can flow into the region, and excrement can be absorbed in the region of the absorbent body.
The absorbent article of the present invention may be the absorbent article according to any one of the above (1) to (11), wherein (12) a surface of the heat-fused portion facing inward in the width direction is a flat surface along the longitudinal direction or a curved surface recessed inward in the width direction.
In the present absorbent article, the surface facing the inside in the width direction (the surface substantially perpendicular to the width direction W) of the heat-fusion bonded portion is a plane along the longitudinal direction, that is, a plane facing the center side of the absorbent article, or a curved surface recessed inward in the width direction, that is, a curved surface recessed with respect to the center side of the absorbent article. This can more reliably block excrement that tends to spread outward in the width direction.
The absorbent article of the present invention may be the absorbent article according to any one of the above (1) to (12), wherein (13) a surface of the heat-fused portion facing the longitudinal direction is a plane along the width direction.
In the absorbent article of the present invention, the surfaces of the heat-fusion bonded portions facing in the longitudinal direction (surfaces substantially perpendicular to the longitudinal direction L), that is, the surfaces of the adjacent heat-fusion bonded portions facing each other, are flat surfaces along the width direction. Therefore, the superabsorbent polymer can be swollen by absorbing excrement more reliably by the surfaces facing each other.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, an absorbent article can be provided, in which an absorbent body can be used efficiently as a whole in an absorbent article having a pair of embossed portions.
Drawings
Fig. 1 is a plan view showing the structure of an absorbent article according to the embodiment.
Fig. 2 is a sectional view taken along line II-II of fig. 1.
Fig. 3 is a schematic diagram illustrating the function of a mild incontinence pad.
Fig. 4 is a plan view showing the structure of the absorber.
Detailed Description
Hereinafter, the absorbent article of the embodiment will be described by taking the light incontinence pad 1 as an example. In this case, the excrement to be absorbed by the light incontinence pad 1 is urine. However, the type and use of the absorbent article are not limited to this example, and other absorbent articles may be used without departing from the scope of the present invention. Examples of such absorbent articles include sanitary pads, sanitary napkins, and disposable diapers.
Fig. 1 to 2 are views showing the structure of a light incontinence pad 1 according to an embodiment. In which fig. 1 shows a top view of a light incontinence pad 1 in an unfolded state, and fig. 2 shows a cross-sectional view along the line II-II in fig. 1. The light incontinence pad 1 has a longitudinal direction L, a width direction W, and a thickness direction T that are orthogonal to each other, and has a longitudinal center line CL that passes through the center of the width direction W and extends in the longitudinal direction L, and a width center line CW that passes through the center of the longitudinal direction L and extends in the width direction W. The direction approaching the longitudinal center line CL and the direction separating from the longitudinal center line CL are respectively defined as the inner and outer directions in the width direction W. The direction approaching the width-direction center line CW and the direction away from the width-direction center line CW are respectively defined as the inner and outer directions in the longitudinal direction L. The "plan view" refers to the light incontinence pad 1 in a state of being developed into a plane including the longitudinal direction L and the width direction W as viewed from above in the thickness direction T, and the "plane shape" refers to a shape grasped when viewed from above. The "skin side" and the "non-skin side" are respectively a side relatively close to the skin surface of the wearer and a side relatively distant from the skin surface of the wearer in the thickness direction T when the light incontinence pad 1 is worn by the wearer. The "in-plane direction" refers to an arbitrary direction parallel to a plane including the width direction W and the length direction L. These definitions are also common not only for light incontinence pads 1, but also for the respective materials of light incontinence pads 1.
As shown in fig. 1, the light incontinence pad 1 has a shape in which both end edges in the longitudinal direction L of a rectangle having long sides extending in the longitudinal direction L and short sides extending in the width direction W are bulged in an arc shape in a plan view. However, in the present embodiment, the shape of the light incontinence pad 1 is not limited to this shape, and any vertically long shape (for example, a rectangle, an ellipse, a gourd-shaped shape, and an hourglass shape) can be used as long as the length dimension in the longitudinal direction L is longer than the width dimension in the width direction W.
As shown in fig. 2, the light incontinence pad 1 includes a front sheet 2, a back sheet 3, and an absorbent body 4 positioned on the non-skin side of the front sheet 2, that is, between the front sheet 2 and the back sheet 3. The light incontinence pad 1 further has a pair of embossed portions 5, 5 arranged at intervals in the width direction W. Each embossed portion 5 extends along the longitudinal direction L and has a structure recessed from the skin-side surface of the topsheet 2 toward the non-skin-side surface of the absorbent body 4 in the thickness direction T. The embossed portion 5 is formed by thermally bonding the topsheet 2 and the absorbent body 4 while pressing them from the skin-side surface of the topsheet 2 toward the non-skin-side surface of the absorbent body 4 (hot embossing). In the present embodiment, as shown in fig. 1, the light incontinence pad 1 further has a pair of other heat embossed portions 6, 6. Each of the other embossed portions 6 extends in the width direction W and is configured to be depressed from the skin-side surface of the topsheet 2 toward the non-skin-side surface of the absorbent body 4 in the thickness direction T. The other embossed portions 6 are also formed by thermally bonding the topsheet 2 and the absorbent body 4 while pressing them from the skin-side surface of the topsheet 2 toward the non-skin-side surface of the absorbent body 4, similarly to the embossed portions 5 (hot embossing).
However, the direction D is a direction along the longitudinal direction L, and includes not only a case where the direction D is parallel to the longitudinal direction L, but also a case where the component Dx in the longitudinal direction L of the direction D is larger than the component Dy in the width direction W of D (Dx > Dy). Similarly, the direction D is a direction along the width direction W, and includes not only a case where the direction D is parallel to the width direction W, but also a case where the component Dy in the width direction W of the direction D is larger than the component Dx in the longitudinal direction L of D (Dy > Dx). In addition, with respect to the curve, the tangent line of each point on the curve is evaluated in the certain direction D as described above.
In the light incontinence pad 1, there is a region where the topsheet 2 and the absorbent body 4 overlap in the thickness direction T, that is, a region that comes into contact with the excretory opening of the wearer when worn, namely, an excretory opening contact region XA. In the present embodiment, the drain contact region XA is a region inside the pair of embossed portions 5 and the pair of other embossed portions 6 and 6 centered on the intersection point of the longitudinal center line CL and the width center line CW. The excrement is mainly excreted into the excretory opening abutment region XA, and after being absorbed, it spreads to the periphery thereof. Specifically, the excretory opening contact region XA is, for example, a region having a length of about 1/4 to 1/2 of the total length of the absorbent body 4 and a width of about 1/2 to 1/3 of the total width of the absorbent body 4, at a substantially central portion in the longitudinal direction L and a substantially central portion in the width direction W of the absorbent body 4. However, the excretory opening contact region XA can be appropriately changed depending on the type of the absorbent article, the sex and age of the wearer of the absorbent article.
The topsheet 2 has the same planar shape as that of the light incontinence pad 1 and is positioned on the skin side of the light incontinence pad 1. The top sheet 2 is a liquid-permeable sheet. The surface sheet 2 is not particularly limited as long as it is a liquid-permeable sheet formed of a heat-fusible fiber or a heat-fusible material, from the viewpoint of heat fusion in hot embossing. Examples of the top sheet 2 include a liquid-permeable nonwoven fabric and woven fabric made of heat-fusible fibers, a liquid-permeable synthetic resin film made of a heat-fusible material, and a composite sheet of these. In the present embodiment, a liquid-permeable through-air nonwoven fabric formed of heat-fusible fibers is used. The basis weight of the surface sheet 2 is, for example, 5g/m2～100g/m2Preferably 20g/m2～50g/m2. The thickness of the surface sheet 2 is, for example, 0.2 to 3 mm.
The back sheet 3 has the same planar shape as that of the light incontinence pad 1 and is located on the non-skin side of the light incontinence pad 1. The back sheet 3 is a liquid impermeable sheet. The back sheet 3 is not particularly limited as long as it is a liquid-impermeable sheet, and examples thereof include a liquid-impermeable nonwoven fabric, a synthetic resin film, a composite sheet of a nonwoven fabric and a synthetic resin film, and an SMS nonwoven fabric. In the present embodiment, an SMS nonwoven fabric having liquid impermeability is used.
The absorbent member 4 has a planar shape similar to that of the light incontinence pad 1, and is enclosed between the front sheet 2 and the back sheet 3. The surface of the front sheet 2 on the non-skin side and the surface of the absorbent member 4 on the skin side are joined to each other, and the surface of the absorbent member 4 on the non-skin side and the surface of the back sheet 3 on the skin side are joined to each other. The peripheral edge portion of the non-skin side surface of the front sheet 2 and the peripheral edge portion of the skin side surface of the back sheet 3 are joined to each other. The absorbent member 4 is a layer having liquid absorbing and liquid retaining properties and comprises a super absorbent polymer and heat-fusible fibers. The thickness of the absorbent member 4 is, for example, 1mm to 5 mm. In the present embodiment, the absorbent body 4 includes an absorbent material 4a and a liquid-permeable sheet 4b covering the absorbent material 4 a. The super absorbent polymer 40 is preferably fixed to the liquid-permeable sheet 4b by a hot melt adhesive or the like (not shown), but may be present without being fixed and covered with the liquid-permeable sheet 4 b.
The absorbent material 4a has a super absorbent polymer 40. The super absorbent polymer 40 is not particularly limited as long as it is a polymer capable of absorbing and retaining water, and examples thereof include starch-based, acrylic acid-based, and amino acid-based particulate or fibrous Super Absorbent Polymers (SAP). The basis weight of the super absorbent polymer 40 can be appropriately adjusted depending on the absorption performance required for the light incontinence pad 1, and examples thereof include 10 to 500g/m2Preferably 100 to 400g/m2. The absorbent material 4a may also have water-absorbent fibers such as pulp fibers and hydrophilic heat-fusible fibers. The content of the water-absorbent fibers is, for example, in the range of 0 to 50% by mass of the super absorbent polymer 40. However, from the viewpoint of thermal fusion in the thermal embossing process, the absorbent material 4a is configured not to include pulp fibers in a region of a thermal fusion portion (described later) of the thermal embossing portion. In the present embodiment, the absorbent material 4a is composed only of the super absorbent polymer 40 and does not include the water absorbent fibers. In another embodiment, the absorbent material 4a contains pulp fibers and/or hydrophilic heat-fusible fibers in addition to the super absorbent polymer 40, but is configured to be thermally responsive to heatThe heat-fused portion (described later) of the embossed portion 5 does not contain pulp fibers.
The liquid-permeable sheet 4b is not particularly limited as long as it is formed of heat-fusible fibers, does not contain pulp fibers, and has liquid permeability, from the viewpoint of heat fusion in the hot embossing process. Examples of the liquid-permeable sheet 4b include a liquid-permeable nonwoven fabric formed of heat-fusible fibers, a laminated nonwoven fabric, and a hydrophilic nonwoven fabric such as a crepe paper. The basis weight of the liquid-permeable sheet 4b may be, for example, 2g/m2～80g/m2Preferably 10g/m2～40g/m2. In the present embodiment, a liquid-permeable air-through nonwoven fabric formed of heat-fusible fibers and not including pulp fibers is used. The liquid-permeable sheet 4b may be a laminate of a plurality of sheets containing heat-fusible fibers and not containing pulp fibers.
One or more liquid-permeable sheets may be provided between the top sheet 2 and the absorbent member 4. For example, a known sheet that imparts liquid diffusibility and cushioning properties to the light incontinence pad 1 can be cited. The liquid-permeable sheet is not particularly limited as long as it is formed of heat-fusible fibers and does not contain pulp fibers, from the viewpoint of heat fusion in hot embossing. In addition, a thin crepe paper may be provided between the back sheet 3 and the absorbent member 4 to supplement the absorption performance.
The heat-fusible fiber is not particularly limited as long as it can be melted and heat-fused by heating in the heat embossing process. Examples of such heat-fusible fibers include polyolefin-based single fibers such as polyethylene, polypropylene, and polyvinyl alcohol, and core-sheath composite fibers such as polyethylene terephthalate (core portion)/polyethylene (sheath portion), polyethylene terephthalate (core portion)/polypropylene (sheath portion), and polypropylene (core portion)/polyethylene (sheath portion). When used for the topsheet 2, the absorbent material 4a, the liquid-permeable sheet 4b, and the like, hydrophilic treatment may be performed with a hydrophilic oil agent or the like. Examples of the heat-fusible material include synthetic resins such as thermoplastic resins.
In the present embodiment, the shape (or pattern) of the pair of embossed portions 5 and 5 has a gentle arc shape (gentle arcuate shape) protruding from the longitudinal center line CL in a plan view. In other words, the distance between the pair of embossed portions 5 and 5 is small (narrow) near the center in the longitudinal direction L and is large (expanded) toward both outer sides in the longitudinal direction L. This shape is line-symmetrical with respect to the longitudinal center line CL and line-symmetrical with respect to the width center line CW. The pair of embossed portions 5, 5 extend in the longitudinal direction L to the vicinity of both ends of the absorbent body 4, and extend in the width direction W to the vicinity of both ends of the absorbent body. The width of the hot embossing part 5 is preferably 0.5 to 4mm, and more preferably 1 to 2 mm. However, the shape of the pair of embossed portions 5 and 5 is not limited to this example, and may have another shape. Examples of the other shape include a shape parallel to the longitudinal direction L and a shape recessed with respect to the longitudinal center line CL.
The pair of embossed portions 5 and 5 includes a plurality of heat-fused portions 5t and a plurality of non-heat-fused portions 5s, respectively. The plurality of heat-fusion portions 5t are arranged intermittently in the longitudinal direction L in the embossed portion 5. The plurality of non-heat-fusion-bonded portions 5s are arranged between the adjacent heat-fusion-bonded portions 5t and 5t in the heat embossing portion 5. In other words, the heat-fused portions 5t and the non-heat-fused portions 5s are alternately arranged along the longitudinal direction L in the heat embossed portion 5. In the present embodiment, the heat-fusion bonded portions 5t and the non-heat-fusion bonded portions 5s are alternately arranged in a gentle arc shape (gentle arc shape) so as to be convex with respect to the longitudinal center line CL in a plan view.
The heat fusion part 5t has the following structure: the topsheet 2 and the liquid-permeable sheet 4b on the skin side of the absorbent body 4 collapse toward the non-skin side in the thickness direction T, and are thermally welded together with the liquid-permeable sheet 4b on the non-skin side of the absorbent body 4. In the present embodiment, the heat fusion bonded portion 5t includes: a bottom portion 5tB formed by heat-sealing the top sheet 2 and the liquid-permeable sheet 4b to each other in the thickness direction T; and a side wall portion 5tW which is erected so as to surround the bottom portion 5tB in a cylindrical shape in the thickness direction T and is configured by overlapping the top sheet 2 and the liquid-permeable sheet 4 b. The bottom portion 5tB of the heat fusion bonded portion 5t has a high-density portion whose material density is higher than that of the surrounding portion by extrusion and melting. The side wall portion 5tW of the heat fusion bonded portion 5t has a shape gradually spreading from the bottom portion 5tB toward the skin side. The non-heat-fused portions 5s are also dependent on the distance between the adjacent heat-fused portions 5T, but have a structure in which the topsheet 2 and the absorbent body 4 are slightly recessed in the thickness direction T due to collapse of the heat-fused portions 5T, 5T on both sides. However, the non-heat-fusion bonded portion 5s may not be recessed.
The heat-fusion bonded portion 5T is configured by the top sheet 2 and the liquid-permeable sheet 4b of the absorbent body 4 being pressed and heat-fused in the thickness direction T. Therefore, the heat fusion bonded portion 5t does not contain pulp fibers. The heat-fused portion 5t may include the absorbent material 4a, but the absorbent material 4a is configured such that the region of the heat-fused portion does not include pulp fibers. Therefore, in this case, the heat fusion bonded portion 5t does not include pulp fibers. The heat-fused part 5t may contain a super absorbent polymer as the absorbent material 4 a. The super absorbent polymer can be melted by heat at the time of hot embossing and constitutes a part of the heat-fused portion, so that the adhesive strength of the heat-fused portion is not lowered.
On the other hand, the non-heat-fused part 5s is configured by laminating the topsheet 2, the liquid-permeable sheet 4b of the absorbent body 4, and the absorbent material 4a in the thickness direction T. Therefore, in the case where the absorbent material 4a is only the super absorbent polymer 40 and does not contain pulp fibers, the non-heat-fused part 5s does not contain pulp fibers. On the other hand, in the case where the absorbent material 4a includes the super absorbent polymer 40 and pulp fibers such as pulp fibers, the non-heat-fusion bonded portion 5s may include pulp fibers. In the present embodiment, the absorbent material 4a is only the super absorbent polymer 40 from the viewpoint of thermal fusion in the hot embossing process, and therefore the non-heat-fused portions 5s include the super absorbent polymer as the absorbent material 4a without including pulp fibers. In the present embodiment, in the absorbent body 4, the basis weight of the superabsorbent polymer present in the non-heat-fused portions 5s is higher than the basis weight of the superabsorbent polymer present in the regions other than the non-heat-fused portions 5 s.
In the present embodiment, the shape (or pattern) of the pair of other emboss portions 6, 6 has a gentle arc shape (gentle arcuate shape) recessed with respect to the widthwise center line CW in a plan view. In other words, the distance between the pair of other embossed portions 6 and 6 is large (wide) near the center in the width direction W and is small (narrow) toward both outer sides in the width direction W. This shape is line-symmetrical with respect to the width-direction center line CW and line-symmetrical with respect to the longitudinal-direction center line CL. The pair of other embossed portions 6 and 6 extend in the width direction W to the vicinity of both end portions of the absorbent body 4, and extend in the longitudinal direction L to the vicinity of both end portions of the absorbent body 4. The width of the other embossed portions 5 is preferably 0.5 to 4mm, and more preferably 1 to 2 mm. However, the shape of the pair of other embossed portions 6 and 6 is not limited to this example, and may have other shapes. Examples of the other shape of the pair of other embossed portions 6 and 6 include a shape parallel to the width direction W and a shape protruding from the width direction center line CW. Further, a pair of other embossed portions may be further provided on the inner side in the longitudinal direction L of the pair of other embossed portions 6 and 6.
The pair of other heat embossing parts 6 and 6 includes a plurality of other heat-fused parts 6t and a plurality of other non-heat-fused parts 6s, respectively. The other heat-fusion portions 6t are arranged intermittently in the width direction W in the other embossed portions 6. The plurality of other non-heat-fusion-bonded parts 6s are arranged between the adjacent other heat-fusion-bonded parts 6t, 6t at the other heat-fusion-bonded parts 6. In other words, the other heat-fused portions 6t and the other non-heat-fused portions 6s are alternately arranged along the width direction W in the other heat embossing portions 6. In the present embodiment, the other heat-fusion bonded portions 6t and the other non-heat-fusion bonded portions 6s are alternately arranged in a gentle arc shape (gentle arcuate shape) so as to be recessed with respect to the widthwise center line CW in a plan view.
Other structures of the other heat-fusion bonded part 6t and the other non-heat-fusion bonded part 6s, for example, specific shapes, structures, and materials are the same as those of the heat-fusion bonded part 5t and the non-heat-fusion bonded part 5s, respectively. Therefore, the description thereof is omitted.
As shown in fig. 2, in the present embodiment, the light incontinence pad 1 further includes a pair of side gusset sheets 7, linear elastic members 8, and a fixing portion 9. The pair of side gather sheets 7 and 7 are leakage preventing walls arranged to cover both surfaces of the top sheet 2 in the width direction W and extending in the longitudinal direction L. The pair of side gather sheets 7 and 7 are foldable so as to be able to stand on both surfaces of the top sheet 2 in the width direction W, and inner edges in the width direction W become free ends so as to form gather portions. The threadlike elastic members 8, 8 are threadlike elastic bodies extending in the longitudinal direction L at the outer end portions in the width direction W of the pair of side gather sheets 7, 7. The linear elastic members 8, 8 are disposed, for example, 2 in each of the pair of side gusset sheets 7, and contract the outer end portions of the pair of side gusset sheets 7, 7 in the width direction W. The fixing portion 9 is an elongated rectangular adhesive tape that is attached to the non-skin side of the back sheet 3 along the longitudinal direction L. In the present embodiment, 3 fixing portions 9 are provided, which are arranged at intervals in the width direction W. The fixing portion 9 fixes the light incontinence pad 1 to a packaging sheet (not shown) via a spacer (not shown) when the light incontinence pad 1 is individually packaged, and fixes the light incontinence pad 1 to underwear of a wearer when the light incontinence pad 1 is used.
Next, an example of a method for producing the light incontinence pad 1 of the present embodiment will be described.
First, the absorbent body 4 is manufactured by, for example, the following method. First, the absorbent material 4a (super absorbent polymer) is disposed in the central region in the width direction W of the liquid-permeable sheet 4b to which the adhesive is applied. Next, regions adjacent to both sides in the width direction W of the region where the absorbent material 4a is arranged are folded inward in the width direction W along the folding line extending in the longitudinal direction L. Here, an adhesive is applied in advance to both ends in the width direction W of the folded liquid-permeable sheet 4 b. Therefore, both end portions are pressed to bond the end portions to each other. On the other hand, an adhesive is applied in advance to both ends in the longitudinal direction L of the region where the absorbent material 4a is disposed. Therefore, both end portions are pressed to bond the end portions to each other. This forms the absorbent body 4 in which the absorbent material 4a is covered with the liquid-permeable sheet 4 b. For example, in the case where the basis weight of the absorbent material 4a (superabsorbent polymer) is intended to be relatively large in the thermally embossed portion of the finished light incontinence pad 1, a method can be adopted in which the basis weight of the adhesive in the region of the liquid-permeable sheet 4b where the thermally embossed portion is formed is relatively large. In this case, for example, the adhesive may be arranged in a shape substantially identical to the shape of the embossed portion in plan view, or may be arranged in a rectangular shape or a band shape including the embossed portion.
Subsequently, the continuous sheet-like surface sheet is supplied to a conveying belt. One surface of the surface sheet is coated with a hot melt adhesive. The absorbent body 4 is pressed against the one surface of the top sheet by a roller. This results in a laminate in which the absorbent body 4 and the topsheet are laminated. Next, the laminate is embossed (hot embossing) while being heated by a pair of rollers of an extrusion apparatus. Thus, the laminate is formed with the pair of embossed portions 5 and 5 including the plurality of heat-fused portions 5t and the pair of other embossed portions 6 and 6 including the plurality of other heat-fused portions 6t, which are described with reference to fig. 1 to 2. Subsequently, the continuous sheet-like back sheet is supplied to a conveying belt. One surface of the back sheet is coated with a hot melt adhesive. The one surface of the back sheet is pressed against the laminated body subjected to the hot embossing process by a roller. This results in a laminate in which the front sheet, the absorbent body 4, and the back sheet are laminated. Then, the laminate is cut at its peripheral portion by a peripheral cutting device, and is separated into the shape of the light incontinence pad 1. Thus, a light incontinence pad 1 (fig. 1) is produced.
However, the above-described manufacturing method is an example, and other known methods can be used.
Next, the operation of the light incontinence pad 1 of the present embodiment will be described. Fig. 3 is a schematic view illustrating the function of the light incontinence pad 1. Fig. 3(a) shows a state of the embossed portion 5 at the initial stage of absorption of excrement by the absorbent body 4, for example, at the time of the 1 st absorption of excrement. Fig. 3(b) shows a state of the embossed portion 5 at the time of absorption of excrement by the absorbent body 4 after comparison with the case of fig. 3(a), for example, 2 nd absorption of excrement. Fig. 3(c) shows a state of the embossed portion 5 at the time of absorption of excrement by the absorbent body 4 after comparison with the case of fig. 3(b), for example, 3 rd time of absorption of excrement. The number of excretions (1 st, 2 nd, 3 rd) is an example, and the number of times the state of fig. 3(a) to 3(c) is reached can vary in various ways depending on the amount of excretion at the time of one excretion.
In the light incontinence pad 1, the pair of embossed portions 5 and 5 has a plurality of heat-fused portions 5t intermittently arranged in the longitudinal direction L, and each heat-fused portion 5t does not contain pulp fibers. In this way, the heat-fusion bonded part 5t is formed by the topsheet 2 and the liquid-permeable sheet 4b formed without including pulp fibers, which are absorbent materials that are difficult to heat-fuse, that is, made of heat-fusion-bondable fibers that are easy to heat-fuse. Therefore, the adhesive strength of the heat fusion bonded part 5t can be increased, and the heat fusion bonded part 5t can be in a state of being difficult to peel. Therefore, it is not necessary to form the heat-fused portions continuously in a groove shape along the longitudinal direction L, and the excrement can be diffused widely through the regions between the plurality of heat-fused portions 5t formed intermittently. In addition, in order to improve the adhesive strength, it is not necessary to arrange the heat-fusion part widely in the light incontinence pad.
It is considered that excrement (exemplified by urine) is excreted in the vicinity of the central portion (excretory opening contact region XA) of the light incontinence pad 1, and diffuses at substantially the same speed in the width direction W and the longitudinal direction L in the absorbent body 4. Therefore, the excrement first reaches the pair of embossed portions 5 and 5 in the width direction W. In this case, as shown in fig. 3(a), at the initial stage of the absorption of the excrement by the absorbent body 4 in the width direction W, for example, at the time of the absorption of the 1 st excrement F10, the excrement F10 spreading in the width direction W can be blocked by the heat-fusion bonded portions 5 t. The blocked excrement F10 can be guided to the non-heat-fused part 5s, which is the region between the adjacent heat-fused parts 5t and 5t where the super absorbent polymer 40 exists. This enables the excrement F10 to flow through the non-heat-fused part 5 s. The excrement F10, namely the excrement F11, flowing through the non-heat-fused portion 5s can be guided to the absorbent body 4 on the outer side in the width direction W than the pair of embossed portions 5, 5. This allows the outer absorbent body 4 to absorb the excrement F11.
As the excrement F11 flows through the non-heat-fused portion 5s, which is the region between the adjacent heat-fused portions 5t, 5t in which the super absorbent polymer 40 is present, the super absorbent polymer 40 present in the non-heat-fused portion 5s absorbs the excrement F11 and gradually swells. As a result, the super absorbent polymer 40 becomes a swollen super absorbent polymer 40 in the near future, and the super absorbent polymer 40 blocks the non-heat-fused part 5s to make the flow of excrement difficult. Therefore, as shown in fig. 3(b), when the absorbent body 4 absorbs excrement later than in the case of fig. 3(a), for example, the 2 nd time excrement F20, the excrement F20 is trapped by the superabsorbent polymer 40 present in the region between the plurality of heat-fused portions 5t and the adjacent heat-fused portions 5t, that is, the non-heat-fused portion 5 s. As a result, the excrement F20 cannot be spread outward in the width direction W from the pair of embossed portions 5 and 5. This allows the excrement F20 to spread forward and backward in the longitudinal direction L with a margin for absorption (excrement F21). Further, the excrement F20 can be prevented from being excessively diffused to the outside in the width direction W than the pair of embossed portions 5 and leaking to the outside in the width direction W.
In this way, in the absorbent body, excrement can be primarily guided in the width direction W region at the initial stage and then primarily guided in the longitudinal direction L region, that is, guided over a wide range in the width direction W and the longitudinal direction L, and absorbed. This enables the absorbent body 4 to be used as a whole with high efficiency. As a result, even when the amount of excrement is large, for example, a large number of excretions are excreted, it is possible to prevent the excrement from being incompletely absorbed and leaking.
When the swelling of the super absorbent polymer 40 progresses further (the super absorbent polymer 40), the force of swelling cannot be fully received, and finally the heat-fusion bonded portion 5t may be peeled off (the heat-fusion bonded portion 5 ta). For example, the top sheet 2 may be peeled off from the absorbent body 4, or the bottom portion 5tB of the heat-fusion bonded portion 5t may be peeled off from the liquid-permeable sheet 4b on the non-skin side. In such a state, as shown in fig. 3(c), when the excrement F30 is absorbed by the absorbent body 4 later than in the case of fig. 3(b), for example, when the 3 rd excrement F30 is absorbed, the excrement F30 is blocked by the super absorbent polymer 40 present in the non-heat-fused portion 5 s. The blocked excrement F30 can be guided to the peeled portion of the heat-fused portion 5 ta. This allows the excrement F30 to flow through the peeled portion of the heat-fused portion 5 ta. Further, the excrement F30, namely the excrement F31, flowing through the peeled portion of the heat-fused portion 5ta can be diffused again into the absorbent body 4 on the outer side in the width direction W than the pair of embossed portions 5, 5. Thus, even in the region of the absorbent body 4 where the excrement is not absorbed by the blocking of the super absorbent polymer 40, the blocking becomes weak and the excrement can flow into the region, and the excrement can be absorbed in the region of the absorbent body. The region of the absorbent body 4 that does not absorb excrement due to blocking by the superabsorbent polymer 40 includes a region outside the heat embossed portion 5 in the width direction W, in which the superabsorbent polymer 40 has blocked too early and has a sufficient capacity to absorb excrement. Therefore, excrement can be guided and absorbed in a wider range in the width direction W and the length direction L. Therefore, the absorbent body 4 can be used more efficiently as a whole.
As a preferred embodiment of the present embodiment, the heat embossing device further includes a pair of other heat embossing portions 6 and 6 arranged with a space therebetween in the longitudinal direction L. The pair of other heat embossing portions 6, 6 has a plurality of other heat fusion portions 6t, 6t intermittently arranged in the width direction W, and each of the other heat fusion portions 6t does not contain pulp fibers. In this way, the other heat-fusion bonded parts 6t are formed of the top sheet 2 and the liquid-permeable sheet 4b which are formed without including pulp fibers as an absorbent material that is difficult to heat-fuse, that is, which are made of heat-fusion-bondable fibers that are easy to heat-fuse. Therefore, the adhesive strength of the other heat-fusion bonded portions 6t can be increased, and the other heat-fusion bonded portions 6t can be made to be in a state of being difficult to peel. Therefore, it is not necessary to form other heat-fused portions continuously in a groove shape along the width direction W, and the excrement can be diffused widely through the regions between the plurality of other heat-fused portions formed intermittently. In addition, in order to improve the adhesive strength, it is not necessary to widely arrange other heat-fusion portions on the light incontinence pad.
In the longitudinal direction L, for example, when the absorbent body absorbs the 2 nd time excrement, the excrement spreading in the longitudinal direction L can be blocked by the other heat-fused portions 6t and guided to the region between the adjacent other heat-fused portions 6t and 6 t. That is, the excrement can flow through the region between the adjacent other heat-fused portions 6t and 6t where the super absorbent polymer 40 is present. Further, the excrement flowing through the region between the other adjacent heat-fused portions 6t, 6t can be guided to the absorbent body 4 outside the pair of other embossed portions 6, 6 in the longitudinal direction L. This allows the outer absorbent body 4 to absorb the excrement.
At this time, as the excrement flows through the region between the adjacent other heat-fusion bonded parts 6t, the super absorbent polymer 40 present in the region between the adjacent other heat-fusion bonded parts 6t, 6t absorbs the excrement and gradually swells, and then the region between the adjacent other heat-fusion bonded parts 6t, 6t is closed to make the excrement hardly flow. Therefore, when the excrement is absorbed by the absorbent body later, for example, the 3 rd excrement absorption, the excrement is blocked by the superabsorbent polymer 40 in the region between the plurality of other heat-fused portions 6t and the adjacent other heat-fused portions 6t and 6t, and does not spread outward in the longitudinal direction L from the pair of other heat-embossed portions 6 and 6. This allows the excrement to be diffused in both end directions in the width direction W in front and rear of the longitudinal direction L having a margin for absorption. Further, the excrement can be prevented from being excessively diffused to the outside in the longitudinal direction L than the pair of other embossed portions 6 and leaking to the outside in the longitudinal direction L. Therefore, the excrement can be absorbed over the entire range in the width direction W and the length direction L.
In a preferred embodiment of the present embodiment, the distance (distance P shown in fig. 3 (a)) between adjacent heat-fusion bonded portions 5t and 5t among the plurality of heat-fusion bonded portions 5t is preferably 0.5mm or more and 5mm or less, and more preferably 1mm or more and 3mm or less. The basis weight of the super absorbent polymer 40 between the adjacent heat-fused portions 5t, 5t is preferably 20g/m2Above and 80g/m2Hereinafter, more preferably 30g/m2Above and 50g/m2The following. Similarly, the distance between the adjacent other heat-fusion bonded portions 6t and 6t among the plurality of other heat-fusion bonded portions 6t is preferably 0.5mm or more and 5mm or less, and more preferably 1mm or more and 3mm or less. The basis weight of the super absorbent polymer 40 between the adjacent other heat-fusion bonded parts 6t, 6t is preferably 20g/m2Above and 80g/m2Hereinafter, more preferably 30g/m2Above and 50g/m2The following.
This enables the excrement to initially flow between the adjacent heat-fused portions 5t and 5t (and the other heat-fused portions 6t and 6t), and thereafter the excrement can be blocked by the swollen super absorbent polymer 40. In the case of less than 0.5mm or more than 80g/m2In the case of (2), the adjacent thermally fused portions 5t, 5t (and the other thermally fused portions 6t, 6t) are blocked by the swelling of the super absorbent polymer 40 too early, and there is a possibility that the excrement is difficult to sufficiently diffuse into the region outside the pair of thermally embossed portions 5, 5 (the pair of other thermally embossed portions 6, 6) in the width direction W (and the longitudinal direction L). In the case of more than 5mm or less than 20g/m2In the case of (3), the adjacent thermally fused parts 5t, 5t and the other thermally fused parts 6t, 6t cannot be blocked sufficiently, and the excrement may excessively spread to the outside in the width direction W (the longitudinal direction L) of the pair of thermally embossed parts 5, 5 (the pair of other thermally embossed parts 6, 6), and may be difficult to spread in the longitudinal direction L (the width direction W) or may leak to the outside in the width direction W (the longitudinal direction L).
In a preferred embodiment of the present embodiment, in the absorbent body 4, the basis weight of the super absorbent polymer 40 in the region (non-heat-bonded portion 5s) between the adjacent heat-bonded portions 5t, 5t is preferably higher than the basis weight of the super absorbent polymer 40 in the other regions. Similarly, in the absorbent body 4, the basis weight of the super absorbent polymer 40 in the region between the adjacent other heat-fusion bonded portions 6t and 6t (the other non-heat-fusion bonded portion 6s) is preferably higher than the basis weight of the super absorbent polymer 40 in the other regions. Wherein the basis weight comparison is made at the maximum of the basis weight of each region.
Therefore, when the excrement is blocked by the swollen super absorbent polymer 40, the excrement can be blocked more reliably. When the super absorbent polymer 40 blocks excrement and further absorbs excrement while diffusing the excrement in the longitudinal direction L (or the width direction W) and swells, the heat-fusion bonded part 5t (or the other heat-fusion bonded parts 6t) cannot completely receive the force of swelling, and finally the heat-fusion bonded part 5t (or the other heat-fusion bonded parts 6t) peels off. Therefore, the excrement can be diffused again in the width direction W (the longitudinal direction L) through the peeled heat-fusion bonded portion 5t (the other heat-fusion bonded portions 6 t). Thus, even in the region of the absorbent body 4 where the excrement is not absorbed by the blocking of the super absorbent polymer 40, the blocking becomes weak and the excrement can flow into the region of the absorbent body 4, and the excrement can be absorbed in the region of the absorbent body 4.
In another embodiment, the region of the super absorbent polymer 40 having a high basis weight may be, for example, a region of an elongated rectangle (for example, inscribed in the hot embossing portion 5) including the hot embossing portion 5 and having long sides parallel to the longitudinal direction L, or a region of an approximately similar elongated rectangle (for example, inscribed in the other hot embossing portion 6) including the other hot embossing portion 6 and having long sides parallel to the width direction W, in view of the simplicity of the manufacturing method. In these cases, when the excrement is blocked by the swollen super absorbent polymer 40, the excrement can be blocked more reliably.
In another embodiment, the absorbent body 4 preferably has the following structure in addition to the basis weight of the super absorbent polymer 40 present in the non-heat-fused portions 5s being higher than the basis weight of the super absorbent polymer 40 present in the other regions as described above. In the absorbent body 4, the basis weight of the super absorbent polymer 40 present in the region adjacent to the outside in the width direction W of the region (non-heat-fused portion 5s) between the adjacent heat-fused portions 5t and outside in the width direction W of each of the pair of embossed portions 5 and 5 is higher than the basis weight of the super absorbent polymer 40 present in the other regions except the region (non-heat-fused portion 5s) between the adjacent heat-fused portions 5t and 5 t. And/or more preferably, in the absorbent body 4, the basis weight of the super absorbent polymer 40 present in the region adjacent to the outside in the longitudinal direction L of the region (other non-heat-bonded portion 6s) between the adjacent other heat-bonded portions 6t, 6t outside in the longitudinal direction L of each of the pair of other heat embossed portions 6, 6 is higher than the basis weight of the super absorbent polymer 40 present in the other regions except the region (other non-heat-bonded portion 6s) between the adjacent other heat-bonded portions 6t, 6 t. Here, the region adjacent to the outside in the width direction W of the non-heat-fusion-bonded portion 5s is, for example, a region having a width in the width direction W that is approximately the same as the width of the non-heat-fusion-bonded portion 5 s. Similarly, the region adjacent to the outside in the longitudinal direction L of the other non-heat-bonded portion 6s is, for example, a region having a width in the longitudinal direction L approximately equal to the width of the other non-heat-bonded portion 6 s. In these cases, the superabsorbent polymer 40 swollen in each adjacent region can further more reliably block excrement.
As a preferred embodiment of the present embodiment, as shown in fig. 3(a), the shape of the heat-fusion bonded portion 5t in plan view is preferably rectangular. The rectangle is arranged such that the 1 st side Y1 of the rectangle is along the longitudinal direction L, and the 2 nd side X1 adjacent to the 1 st side Y1 is along the width direction W. Further, the ratio of the 1 st side Y1 to the 2 nd side X1 is preferably 1: 0.7-1: 1.3, more preferably 1: 0.9-1: 1.1. the other heat-fusion bonded portions 6t are also the same as the heat-fusion bonded portions 5 t.
Therefore, in the case of the heat-fused portion 5t, the excrement spreading outward in the width direction W can be more reliably blocked by the surface forming the 1 st side Y1, that is, the surface substantially perpendicular to the width direction W. In addition, the super absorbent polymer swollen by absorbing the excrement can be held so as not to move in the excrement so as to be sandwiched from both sides by the surface forming the 2 nd side X1, that is, the surface substantially along the width direction W. If the 1 st edge is too short, it is difficult to reliably block excrement spreading outward in the width direction. When the 2 nd side is too short, it is difficult to retain the swollen super absorbent polymer which absorbs the excrement. The other heat-fusion bonded parts 6t are the same as those of the heat-fusion bonded parts 5t except for the function of exchanging the 1 st side Y1 in the width direction W with the 2 nd side X1 in the longitudinal direction L.
In a preferred embodiment of the present invention, the area of the heat-fusion bonded part 5t in a plan view is preferably 0.5mm2Above and 5mm2Hereinafter, more preferably 1mm2Above and 4mm2The following. The other heat-fusion bonded portions 6t are also the same as the heat-fusion bonded portions 5 t.
Therefore, the heat-fused portions 5t (and the other heat-fused portions 6t) can reliably block the excrement spreading to the outside in the width direction W (and the longitudinal direction L), and the super absorbent polymer 40 swollen by absorbing the excrement can be held in the rowThere is no movement in the reject. At less than 0.5mm2In the case of (2), it may be difficult to reliably block excrement. In excess of 5mm2In the case of (2), it may be difficult to hold the super absorbent polymer.
In a preferred embodiment of the present embodiment, the adhesion strength of the heat-fusion bonded portion 5t is preferably 0.05N or more and 1N or less, and more preferably 0.08N or more and 0.5N or less. The other heat-fusion bonded portions 6t are also the same as the heat-fusion bonded portions 5 t.
Therefore, in the initial swelling of the super absorbent polymer 40, the thermally fused portions 5t (and the other thermally fused portions 6t) do not peel off, and the excrement which is about to spread in the width direction W (or the longitudinal direction L) of the swollen super absorbent polymer 40 can be blocked between the adjacent thermally fused portions 5t, 5t (and the other thermally fused portions 6t, 6 t). This allows the excrement to be diffused in the longitudinal direction L (or the width direction W). When the swelling of the super absorbent polymer 40 progresses to a certain extent, the force of swelling cannot be fully received, and finally the heat-fusion bonded portion 5t (and the other heat-fusion bonded portions 6t) are peeled off. This allows the excrement to be diffused again in the width direction W (or the longitudinal direction L) through the heat-fused portion 5t (or the other heat-fused portions 6 t). Thus, even in the region of the absorbent body 4 where the excrement is not absorbed by the blocking of the super absorbent polymer 40, the blocking becomes weak and the excrement can flow into the region of the absorbent body 4, and the excrement can be absorbed in the region of the absorbent body 4. When the adhesive strength is less than 0.05N, the thermally fused portion 5t (or the other thermally fused portions 6t) may peel off during attachment. When the adhesive strength exceeds 1N, the heat-fused portion 5t (or the other heat-fused portions 6t) may not be peeled off when the swelling of the super absorbent polymer 40 progresses to a certain extent.
In a preferred embodiment of the present invention, the surface of the heat-fusion bonded portion 5t facing the inside in the width direction W (the surface substantially perpendicular to the width direction W) is preferably a flat surface along the longitudinal direction L or a curved surface recessed inward in the width direction W. Similarly, the surface of the other heat-fusion bonded portion 6t facing inward in the longitudinal direction L (the surface substantially perpendicular to the longitudinal direction L) is preferably a flat surface along the width direction W or a curved surface recessed inward in the longitudinal direction L.
The surface of the heat-fusion bonded portion 5t facing the inside in the width direction W (the surface substantially perpendicular to the width direction W) is a plane along the longitudinal direction L, that is, a plane facing the center side of the light incontinence pad 1, or a curved surface recessed inward in the width direction W, that is, a curved surface recessed toward the center side of the light incontinence pad 1. This can more reliably block excrement that tends to spread outward in the width direction W. Similarly, the surface of the other heat-fusion bonded portion 6t facing the inside in the longitudinal direction L (the surface substantially perpendicular to the longitudinal direction L) is a plane along the width direction W, that is, a plane facing the center side of the light incontinence pad 1, or a curved surface recessed inward in the longitudinal direction L, that is, a curved surface recessed toward the center side of the light incontinence pad 1. This can more reliably block excrement that tends to spread outward in the longitudinal direction L.
In a preferred embodiment of the present embodiment, a surface of the heat-fusion bonded portion 5t facing the longitudinal direction L (a surface substantially perpendicular to the longitudinal direction L) is preferably a plane along the width direction W. Similarly, the surface of the other heat-fusion bonded portion 6t facing the width direction W (the surface substantially perpendicular to the width direction W) is preferably a plane along the longitudinal direction L.
That is, the surfaces of the heat-fusion bonded portions 5t facing the longitudinal direction L (surfaces substantially perpendicular to the longitudinal direction L), that is, the surfaces facing each other in the adjacent heat-fusion bonded portions 5t and 5t are flat surfaces along the width direction W. Therefore, the super absorbent polymer 40 swollen by absorbing the excrement can be held more reliably by the surfaces facing each other. Similarly, the surfaces of the other heat-fusion bonded portions 6t facing in the width direction W (surfaces substantially perpendicular to the width direction W), that is, the surfaces facing each other of the adjacent other heat-fusion bonded portions 6t and 6t are flat surfaces along the longitudinal direction L. Therefore, the super absorbent polymer 40 swollen by absorbing the excrement can be held more reliably by the surfaces facing each other.
Fig. 4 is a plan view showing the structure of the absorbent body 4.
In a preferred embodiment of the present embodiment, the length E1L in the longitudinal direction L of each of the pair of embossed portions 5 and 5 is preferably 30% to 80%, more preferably 40% to 70%, with the length AL in the longitudinal direction L of the absorbent body 4 being 100%. This enables the thermally fused portions 5t to more reliably block the spread of excrement in the width direction W, and to guide the excrement to the region between the adjacent thermally fused portions 5t and 5 t. If the amount is less than 30%, even if the adjacent heat-fused portions 5t and 5t are blocked by the swelling of the super absorbent polymer 40, the excrement may easily spread outward in the width direction W in the portions other than the pair of embossed portions 5 and 5 in the absorbent body 4, and may be difficult to spread in the longitudinal direction L. If the content exceeds 80%, the excrement may be less likely to spread to the regions at both ends in the longitudinal direction L outside the pair of embossed portions 5, 5 in the width direction W in the absorbent body 4.
In a preferred embodiment of the present embodiment, in the pair of embossed portions 5 and 5, the distance E1Wa in the width direction W between the center portions in the longitudinal direction L is preferably shorter than the distance E1Wb in the width direction W between the end portions in the longitudinal direction L. That is, the pair of embossed portions 5 and 5 have a shape in which the central portion in the longitudinal direction L is narrowed inward. Therefore, the area of the region inside the pair of embossed portions 5 and 5 can be relatively narrowed at the center portion in the longitudinal direction L, and the area of the region inside the pair of embossed portions 5 and 5 can be relatively enlarged at the end portions in the longitudinal direction L. In other words, the amount of excrement that can be absorbed by the center portion in the longitudinal direction L of the absorbent body 4 can be relatively reduced, and the amount of excrement that can be absorbed by the end portions in the longitudinal direction L can be relatively increased. Here, the central portion in the longitudinal direction substantially corresponds to the drain port contact region. Therefore, the excreted excrement is less likely to stay in the central portion and can easily spread toward the end portions in the longitudinal direction L. However, the distance between the central portions in the longitudinal direction L of the pair of embossed portions 5 and 5 is preferably 30% to 70%, more preferably 40% to 60%, with the width in the width direction W of the central portion in the longitudinal direction L of the absorbent body 4 being 100%. The distance between the ends of the pair of embossed portions 5 and 5 in the longitudinal direction L is preferably 35% to 95%, more preferably 45% to 85%, with the width of the ends of the absorbent body 4 in the width direction W being 100%.
In a preferred embodiment of the present embodiment, the length E2W in the width direction W of each of the pair of other embossed portions 6 and 6 is preferably 10% to 70%, more preferably 20% to 60% with the length AW in the width direction W of the absorbent body 4 as 100%. This can more reliably block the diffusion of excrement in the longitudinal direction L by the other heat-fusion bonded parts 6t, and guide the excrement to the region between the adjacent other heat-fusion bonded parts 6t, 6 t. If the ratio is less than 10%, the excrement may excessively spread to the region outside the pair of other embossed portions 6 and 6 in the longitudinal direction L in the absorbent body 4 and leak to the outside in the longitudinal direction L. If the ratio exceeds 70%, the excrement is less likely to spread to the outside in the longitudinal direction L and the areas near both ends in the width direction W of the pair of other embossed portions 6, 6 in the absorbent body 4, and the absorbent body 4 may not be used efficiently.
In a preferred embodiment of the present embodiment, in the pair of other embossed portions 6 and 6, the distance E2Wa in the longitudinal direction L between the central portions in the width direction W is preferably longer than the distance E2Wb in the longitudinal direction L between the end portions in the width direction W. That is, the pair of other embossed portions 6 and 6 have a shape in which the central portion in the width direction W bulges outward. Therefore, the area of the inner side of the pair of other embossed portions 6, 6 can be enlarged in the center portion in the width direction W. In other words, the amount of excrement that can be absorbed in the central portion of the absorber in the width direction W can be increased. Therefore, the excreted excrement can be more easily diffused toward the end in the longitudinal direction L. However, the distance in the longitudinal direction L between the center portions in the width direction W of the pair of other embossed portions 6 and 6 is preferably 35% to 85%, more preferably 45% to 80%, with the length in the longitudinal direction L of the center portion in the width direction W of the absorbent body 4 being 100%. The distance in the longitudinal direction L between the ends in the width direction W of the pair of other embossed portions 6, 6 is preferably 30% to 80%, more preferably 40% to 75%, with the length in the longitudinal direction L of the ends in the width direction W of the absorbent body 4 being 100%.
In the example of fig. 2, the heat fusion bonded portion 5t includes a bottom portion 5tB and a side wall portion 5 tW. However, in another embodiment, the heat-fusion bonded portion 5t may include a bottom portion and a peripheral wall portion (not shown). The bottom portion is a high-density portion in which the front sheet 2 and at least the liquid-permeable sheet 4b are heat-welded to each other in the thickness direction T. This bottom is identical to the bottom 5tB of fig. 2. The peripheral wall portion is a wall portion that is erected so as to surround the bottom portion in a cylindrical shape in the thickness direction T, and the top sheet 2 and at least the liquid-permeable sheet 4b are heat-welded to each other in the thickness direction T. The height of the peripheral wall in the thickness direction may be, for example, about 2 times the thickness of the bottom portion, or about 1/3 times the thickness of the absorbent body 4 (the remaining portion is the side wall portion). The peripheral wall portion and the side wall portion 5tW in fig. 2 are different from each other in that the peripheral wall portion and the bottom portion are formed by thermal welding. That is, the peripheral wall portion is formed by melting the top sheet 2 and at least the liquid-permeable sheet 4b by heat and then cooling and solidifying, whereas the side wall portion 5tW in fig. 2 is formed by laminating the top sheet 2 and at least the liquid-permeable sheet 4b without melting. Such a peripheral wall portion is formed by relatively increasing the energy supplied during the hot embossing (for example, increasing the heating temperature, extending the heating and pressing time, and using an ultrasonic horn during pressing). If the heat-fusion bonded portion 5t has a peripheral wall portion, the peripheral wall portion is less likely to deform than the heat-fusion bonded portion 5t having the side wall portion 5tW in fig. 2, and therefore the swollen super absorbent polymer 40 can be held more reliably between the adjacent heat-fusion bonded portions 5t, 5 t. The other heat fusion bonded portions 6t may similarly include a bottom portion and a peripheral wall portion.
< distance between the heat-fused parts >
The distance between the heat-fusion bonded portions was measured by the following method. (1) A sample was obtained by cutting out a light incontinence pad having a size of 20X 40mm from the area to be measured. (2) The sample was scanned 360 degrees by using a fluoroscopy apparatus FLEX-M863 (manufactured by BEAMSENCENCE Co., Ltd.). Specifically, an X-ray fluoroscopic image is taken every time the sample is rotated by 0.2 degrees, 1800X-ray fluoroscopic images corresponding to 360 degrees are acquired, and the acquired 1800X-ray fluoroscopic images are pieced together to create a 3D image. (3) A cross-sectional view including the edge of the object to be measured is extracted from the 3D image, and the distance between the edges of the heat-fusion bonded portions is measured as the distance between the heat-fusion bonded portions from the extracted cross-sectional view.
Basis weight of superabsorbent polymers
The basis weight of the superabsorbent polymer is determined using the following method. (1) The dimension of the measurement target region in a light incontinence pad in a plan view is measured, and the area of the measurement target region is determined. (2) The area to be measured was cut out from the light incontinence pad as a sample. (3) Only the super absorbent polymer was carefully taken out from the sample, and the mass of the super absorbent polymer taken out was measured. (4) The basis weight was calculated by dividing the mass of the taken-out super absorbent polymer by the area of the measurement target region. (5) The basis weight of the super absorbent polymer was determined as the average of the basis weights of the 3 samples.
< adhesion Strength test >
The adhesive strength of the heat-fused part was measured by the following method. (1) The laminate of the topsheet and the absorbent member was taken out of the light incontinence pad and cut into a width of 25mm to obtain a sample. At this time, the cut is performed to separate the liquid-permeable sheet on the skin side from the liquid-permeable sheet on the non-skin side. (2) The ends of the top sheet and the liquid-permeable sheet on the non-skin side of the sample in the longitudinal direction were held by grips of a tensile tester (distance between grips 10 mm). (3) The surface sheet and the liquid-permeable sheet on the non-skin side were pulled apart in the 180 ° direction by a tensile tester, and the load value was measured. (4) The maximum value of the measured load values was defined as the joint strength (N/25 mm).
Examples
The present invention will be described in more detail below with reference to examples and comparative examples. However, the present invention is not limited to such an embodiment.
(1) Test specimen
As a sample of example 1, a light incontinence pad of the embodiment shown in fig. 1 to 2 was produced. As a sample of comparative example 1, a light incontinence pad was produced in the same manner as in example 1, except that the embossed portions were heat-fused portions continuously formed in a groove shape instead of a plurality of heat-fused portions formed intermittently.
However, in the sample of example 1, the distance between the adjacent heat-fusion bonded portions at this time was 2.4mm, basis weight of the super absorbent polymer between adjacent heat-fused parts is 40g/m2The distance between adjacent other heat-fused portions and the basis weight of the super absorbent polymer between adjacent other heat-fused portions are also the same. The shape of each of the heat-fusion bonded portion and the other heat-fusion bonded portions in a plan view is square, and therefore, the ratio of the 1 st side to the 2 nd side is 1: 1 the area of each of the heat-fusion bonded part and the other heat-fusion bonded part in plan view is 1mm2. The length of each of the pair of embossed portions in the longitudinal direction is 60% of the length of the absorbent body in the longitudinal direction. In the pair of heat embossing portions, the distance in the width direction between the center portions in the longitudinal direction is 50% of the width of the absorbent body, and the distance in the width direction between the end portions in the longitudinal direction is 70% of the width of the absorbent body. The length of each of the pair of other embossed portions in the width direction is 55% of the length of the absorbent body in the width direction. The longitudinal distance between the widthwise central portions of the pair of other embossed portions 6, 6 is 80% of the length of the absorbent body, and the longitudinal distance between the widthwise end portions is 75% of the length of the absorbent body 4. In the absorbent body, the basis weight of the superabsorbent polymer in the region between the adjacent heat-fused portions is relatively higher than the basis weight of the superabsorbent polymer in the other regions.
(2) Method for evaluating absorption performance
In the center portion of the sample (a portion where the longitudinal center line CL and the width center line CW in fig. 1 cross each other), 3cc of each of physiological saline used as urine was dropped from a height of 30cm every 30 seconds. Then, each time the physiological saline was dropped, the time from when the physiological saline reached the surface of the surface sheet in the central portion of the sample to when the physiological saline disappeared from the surface of the surface sheet, that is, the time required for absorption of the physiological saline (hereinafter, referred to as "absorption time") was measured.
(3) Evaluation results
The results of the absorption property evaluation are shown in Table 1. As shown in table 1, in the sample of example 1, the absorption time hardly changed from the 1 st drop to at least the 5 th drop. On the other hand, in the sample of comparative example 1, the absorption time increased as the number of dropping times increased. Specifically, the absorption time B of the sample of comparative example 1 was 1.0 times the absorption time a of the sample of example 1 and hardly changed, but was 1.2 times the absorption time B of 2, 2.2 times the absorption time B of 3, 4.3 times the absorption time B of 4, and 7.0 times the absorption time B of 5. That is, in the sample of example 1, although the absorption performance hardly changed regardless of the frequency, it was found that the absorption performance was deteriorated as the frequency was increased in the sample of comparative example 1. This is considered to be because the embossed portions of the sample of example 1 were not heat-fused portions formed continuously in a groove shape, but were a plurality of heat-fused portions formed intermittently. The adhesive strength between the heat-fused part and the other heat-fused parts is 0.1 to 0.3N/25mm, which is a value that causes no problem when used.
[ Table 1]
Figure BDA0002618992110000291
The absorbent article of the present invention is not limited to the above-described embodiments, and can be appropriately combined with, modified, and the like without departing from the object and the gist of the present invention.
Description of the reference numerals
1 light incontinence pad (absorbent article)
2 surface sheet
3 Back sheet
4 absorbent body
5 hot pressing flower part
5t hot-melt part
40 superabsorbent polymers

Claims (13)

1. An absorbent article having a longitudinal direction, a width direction, and a thickness direction, and comprising a topsheet and an absorbent body positioned on the non-skin side of the topsheet,
the absorbent body comprises a super absorbent polymer and heat-fusible fibers,
the absorbent article has a pair of embossed portions arranged at intervals in the width direction,
the pair of embossed portions are provided so as to extend in the longitudinal direction and are recessed in the thickness direction from the skin-side surface of the top sheet toward the non-skin-side surface of the absorbent body,
the pair of embossed portions includes a plurality of heat-fusion portions intermittently arranged along the longitudinal direction,
the plurality of heat fusion parts do not contain pulp fibers,
the super absorbent polymer is present at least in a region between the heat-welded parts adjacent in the longitudinal direction among the plurality of heat-welded parts.
2. The absorbent article according to claim 1,
the distance between adjacent heat-fused parts in the plurality of heat-fused parts is more than 0.5mm and less than 5mm, and the basis weight of the high-absorptivity polymer between the adjacent heat-fused parts is 20g/m2Above and 80g/m2The following.
3. The absorbent article according to claim 1 or 2,
the length of each of the pair of embossed portions in the longitudinal direction is 30% to 80% of the length of the absorbent body in the longitudinal direction.
4. The absorbent article according to any one of claims 1 to 3,
in the pair of heat embossing portions, a distance in the width direction between the center portions in the longitudinal direction is shorter than a distance in the width direction between the end portions in the longitudinal direction.
5. The absorbent article according to any one of claims 1 to 4,
the absorbent article further includes a pair of other embossed portions arranged at intervals in the longitudinal direction,
the pair of other embossed portions are respectively provided so as to extend in the width direction and are recessed in the thickness direction from the skin-side surface of the top sheet toward the non-skin-side surface of the absorbent body,
the pair of other embossed portions include a plurality of other heat-fusion portions intermittently arranged in the width direction,
the plurality of other heat welds do not contain pulp fibers,
the super absorbent polymer is present at least in a region between the other heat-fused portions adjacent in the width direction among the plurality of other heat-fused portions.
6. The absorbent article according to claim 5,
the length of each of the pair of other embossed portions in the width direction is 10% to 70% of the length of the absorbent body in the width direction.
7. The absorbent article according to claim 5 or 6,
in the pair of other thermal embossing portions, the distance in the longitudinal direction between the widthwise central portions is longer than the distance in the longitudinal direction between the widthwise end portions.
8. The absorbent article according to any one of claims 1 to 7,
in the absorbent body, the basis weight of the super absorbent polymer in the region between the adjacent heat-fused portions is higher than the basis weight of the super absorbent polymer in the other regions.
9. The absorbent article according to any one of claims 1 to 8,
the shape of the hot-melt connecting part in a plan view is rectangular,
the rectangle is arranged such that the 1 st edge of the rectangle is along the longitudinal direction and the 2 nd edge adjacent to the 1 st edge is along the width direction,
the ratio of the 1 st edge to the 2 nd edge is 1: 0.7-1: 1.3.
10. the absorbent article according to any one of claims 1 to 9,
the area of the hot melt joint in plan view is 0.5mm2Above and 5mm2The following.
11. The absorbent article according to any one of claims 1 to 10,
the adhesive strength of the hot-melt part is more than 0.05N/25mm and less than 1N/25 mm.
12. The absorbent article according to any one of claims 1 to 11,
the surface of the heat-fusion part facing the inner side of the width direction is a plane along the length direction or a curved surface recessed towards the inner side of the width direction.
13. The absorbent article according to any one of claims 1 to 12,
the surface of the heat-fusion part facing the longitudinal direction is a plane along the width direction.
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