CN113825476B - Absorbent article - Google Patents

Absorbent article Download PDF

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Publication number
CN113825476B
CN113825476B CN202080030236.3A CN202080030236A CN113825476B CN 113825476 B CN113825476 B CN 113825476B CN 202080030236 A CN202080030236 A CN 202080030236A CN 113825476 B CN113825476 B CN 113825476B
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Prior art keywords
absorbent article
liquid
gel lotion
portions
present
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CN202080030236.3A
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CN113825476A (en
Inventor
和田一郎
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Unicharm Corp
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Unicharm Corp
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Priority claimed from JP2019080548A external-priority patent/JP2020174996A/en
Priority claimed from JP2019080547A external-priority patent/JP7178951B2/en
Application filed by Unicharm Corp filed Critical Unicharm Corp
Publication of CN113825476A publication Critical patent/CN113825476A/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
    • 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
    • A61F13/53—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

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

Abstract

The invention provides an absorbent article having excellent body fluid diffusion during repeated absorption. The present invention also provides an absorbent article that can exhibit a lotion function and is excellent in a liquid transfer function and a liquid-return inhibiting function. The absorbent article (1) of the present invention is provided with a gel lotion coating section (5) coated with a specific gel lotion at least in a part of a region of a fibrous sheet disposed between a top sheet (2) and an absorbent layer (4) that overlaps with the absorbent layer (4) in the thickness direction, and the region of the fibrous sheet provided with the gel lotion coating section (5) is provided with a high fiber density section having a higher fiber density than the peripheral section. The absorbent article of the present invention is provided with a fabric sheet that is arranged on the skin side of the absorbent body (40) and that contains fibers (2F), wherein the fabric sheet contains a specific gel lotion (60), and at least a part of the gel lotion is arranged as a plurality of film portions (610) that extend along a plurality of fiber portions that constitute the fibers (2F).

Description

Absorbent article
Technical Field
The present invention relates to an absorbent article.
Background
Absorbent articles having a gel lotion application section on the skin-side surface of the top sheet are known.
For example, patent document 1 discloses an absorbent article including a top sheet, a back sheet, and an absorbent layer disposed between the top sheet and the back sheet, wherein the absorbent article has a gel lotion containing a gelling agent such as a styrene-based elastomer and a lotion such as hydrocarbon in at least a part of a region in contact with the skin of a wearer.
Prior art documents
Patent document
Patent document 1: japanese patent laid-open publication No. 2015-229075
Disclosure of Invention
Problems to be solved by the invention
Among absorbent articles, there are absorbent articles that are required to absorb body fluid many times, and when an absorbent article absorbs body fluid, it is preferable to diffuse the body fluid in the longitudinal direction and the width direction on the top sheet and efficiently absorb the body fluid. However, when the absorbent article repeatedly absorbs body fluid, the diffusion of body fluid may not be sufficient.
In this regard, the absorbent article described in patent document 1 aims to continuously release a lotion for protecting the skin of a wearer to the skin of the wearer by applying a gel lotion to at least a part of a region in contact with the skin of the wearer, and does not provide a solution to the diffusion of a body fluid during repeated absorption that exhibits sufficient body fluid diffusion in the longitudinal direction and the width direction of the absorbent article even during the second and subsequent absorption of the body fluid.
In an absorbent article having a top sheet or the like surface-treated to improve the diffusion of body fluid, the affinity of body fluid for the top sheet or the like is improved, and the diffusion of body fluid may be insufficient when the absorbent article absorbs body fluid once, because the surface-treated agent is washed away by body fluid.
In the absorbent article disclosed in patent document 1, the gel lotion is hydrophobic, and therefore, although the gel lotion is disposed so as not to inhibit the absorption of liquid, there is still room for improvement in terms of liquid transferability and liquid return inhibition.
Accordingly, a first object of the present invention is to provide an absorbent article having excellent body fluid diffusion properties during repeated absorption even when components present on the surface of the absorbent article are washed away by body fluid absorbed by the absorbent article.
A second object of the present invention is to provide an absorbent article that can exhibit a lotion function and is excellent in a liquid transfer function and a rewet suppression function.
Means for solving the problems
The present inventors have made extensive studies in view of the above problems. As a result, the present inventors have found that the above-described problems can be solved by an absorbent article which is an absorbent article comprising: a gel lotion containing a styrene-based elastomer, a hydrocarbon oil and a surfactant is applied to at least a part of a fiber sheet disposed on the skin side of an absorbent layer of an absorbent article, and the fiber sheet has a high fiber density portion in a region coated with the gel lotion.
Specifically, the present invention provides an absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent layer disposed between the top sheet and the back sheet, wherein the absorbent article comprises a gel lotion coating section coated with a gel lotion containing a styrene elastomer, a hydrocarbon oil, and a surfactant in at least a part of a region of a fibrous sheet selected from the top sheet and a sheet capable of being disposed between the top sheet and the absorbent layer, the region of the fibrous sheet provided with the gel lotion coating section having a high fiber density section having a higher fiber density than that of a peripheral section, the region overlapping the absorbent layer in the thickness direction.
Effects of the invention
According to the present invention, an absorbent article having excellent diffusion of body fluid during repeated absorption can be provided.
The absorbent article of the present invention can exhibit a lotion function and is excellent in a liquid transfer function and a liquid return suppression function.
Drawings
Fig. 1 is a plan view of an absorbent article in a first embodiment.
Fig. 2 is a sectional view at II-II of fig. 1.
Fig. 3 is a perspective view of a top sheet used in the absorbent article in the first embodiment.
Fig. 4 is a plan view of the absorbent article in the second embodiment.
Fig. 5 is a sectional view at V-V of fig. 4.
Fig. 6 is a perspective view of a top sheet used in the absorbent article in the second embodiment.
Fig. 7 is a sectional view of the absorbent article in the third embodiment, corresponding to fig. 2.
Fig. 8 is a plan view of a sanitary napkin 10 according to an embodiment of the present invention.
Fig. 9 is an end view of the sanitary napkin 10 taken along the line II-II in fig. 8.
Fig. 10 is an enlarged perspective view of a main portion of the liquid-permeable sheet 20 in the sanitary napkin 10.
Fig. 11 is a main part enlarged plan view schematically showing the coated part of the gel lotion 60 in the liquid-permeable sheet 20.
Fig. 12 is a schematic diagram for explaining the film portion 610 made of the gel lotion 60.
Detailed Description
The present invention will be described below.
[ first mode ]
(Structure)
An absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent layer disposed between the top sheet and the back sheet, wherein the absorbent article comprises a gel lotion coating section coated with a gel lotion in at least a part of a region overlapping with the absorbent layer in the thickness direction of a fibrous sheet selected from the top sheet and a sheet capable of being disposed between the top sheet and the absorbent layer, wherein the gel lotion comprises a styrene-based elastomer, a hydrocarbon oil, and a surfactant, and wherein the region of the fibrous sheet provided with the gel lotion coating section comprises a high fiber density section having a fiber density higher than that of the peripheral section.
(Effect)
The absorbent article according to the first aspect of the present invention includes a gel lotion coating section coated with a gel lotion in at least a part of a region overlapping with an absorbent layer in a thickness direction of a fibrous sheet selected from a top sheet and a sheet disposed between the top sheet and the absorbent layer. Further, since the hydrocarbon oil and the surfactant contained in the gel lotion have different polarities, the surfactant is likely to bleed out to the surface of the gel lotion, and the diffusion of the body fluid absorbed by the absorbent article is improved by the action of the bled-out surfactant. In the absorbent article according to the first aspect of the present invention, even if the surfactant present on the surface of the fibrous sheet or the gel lotion is washed away by body fluid, the surfactant is supplied from the inside of the gel lotion and oozes out again to the surface of the gel lotion, and thus the diffusion of body fluid can be maintained.
In the absorbent article according to the first aspect of the present invention, since the region of the fibrous sheet provided with the gel lotion coating portion includes the high fiber density portion having a higher fiber density than the peripheral portion, the body fluid and the surfactant exuded to the surface of the gel lotion are easily diffused to the high fiber density portion by capillary action, and the diffusion property of the body fluid is improved. Therefore, the absorbent article of the present invention has excellent body fluid diffusion properties during repeated absorption.
[ second mode ]
(Structure)
The absorbent article according to the first aspect is characterized in that the fibrous sheet is the top sheet, and the gel lotion coating portion is disposed on a non-skin side surface of the top sheet.
(Effect)
According to the second aspect of the present invention, the gel lotion is applied to the non-skin side of the topsheet. Therefore, the gel lotion hardly blocks the permeation of body fluid through the top sheet, and therefore the absorbent article easily absorbs body fluid from the entire surface of the top sheet. Therefore, the body fluid permeability, which is the property of the top sheet to transmit donor fluid, can be maintained satisfactorily.
[ third mode ]
(Structure)
An absorbent article according to a second aspect is the absorbent article according to the first aspect, wherein the top sheet has concave portions and convex portions alternately arranged in at least one direction, and an amount of the gel lotion present on a non-skin side surface of the concave portions is smaller than an amount of the gel lotion present on a non-skin side surface of the convex portions.
(Effect)
According to the third aspect of the present invention, since the amount of the gel lotion present on the non-skin side surface of the recessed portion is smaller than the amount of the gel lotion present on the non-skin side surface of the raised portion, body fluid easily permeates from the recessed portion of the top sheet into the absorbent layer. Therefore, the body fluid permeability of the topsheet is improved.
[ fourth mode ]
(Structure)
The absorbent article according to a third aspect is characterized in that a convex portion is disposed on a non-skin side surface of a concave portion disposed on a skin side surface of the top sheet, and a concave portion is disposed on a non-skin side surface of the convex portion disposed on the skin side surface.
(Effect)
In a fourth aspect of the present invention, the top sheet has protrusions and recesses that form a wave-shaped cross section. Here, since the gel lotion is present more on the non-skin-side surfaces of the convex portions than on the non-skin-side surfaces of the concave portions, the surfactant that has oozed out from the gel lotion on the non-skin-side surfaces of the convex portions is likely to diffuse into the concave portions also by gravity. This improves the diffusion of body fluid not only in the convex portion but also in the concave portion.
[ fifth mode ]
(Structure)
The absorbent article according to the third or fourth aspect, wherein the concave portion and the convex portion are arranged in a direction orthogonal to the at least one direction, respectively, and the gel lotion coating portion is arranged in the orthogonal direction.
(Effect)
According to the fourth aspect of the present invention, since the convex portions which easily diffuse the body fluid by the action of the gel lotion and the concave portions through which the body fluid moved from the convex portions easily passes are present along the orthogonal direction, and the gel lotion coating portions are also arranged along the orthogonal direction, the body fluid diffusion property during repeated absorption of the absorbent article and the body fluid permeability of the top sheet are improved.
[ sixth mode ]
(Structure)
An absorbent article according to a fifth aspect is characterized in that an absorbent layer embossing pattern is formed on a surface of the absorbent layer along one or more directions intersecting with the orthogonal direction.
(Effect)
According to the sixth aspect of the present invention, the absorbent layer embossing pattern formed on the surface of the absorbent layer diffuses body fluid that has passed through the top sheet and reached the surface of the absorbent layer in one or more directions intersecting the direction orthogonal to the above-mentioned direction, so that the diffusion of body fluid during repeated absorption of the absorbent article is improved.
[ seventh mode ]
(Structure)
The absorbent article according to the third or fourth aspect, wherein the concave portions and the convex portions are arranged in a zigzag pattern.
(Effect)
According to the seventh aspect of the present invention, since the convex portions which easily diffuse the body fluid and the concave portions through which the body fluid moved from the convex portions easily passes are present in a zigzag pattern, the body fluid diffusion property at the time of repeated absorption of the absorbent article and the body fluid permeability of the top sheet are both improved.
[ eighth mode ]
(Structure)
The absorbent article according to any one of the third to seventh aspects, wherein the high fiber density portion of the top sheet is present in the concave portion.
(Effect)
According to the eighth aspect of the present invention, since the recessed portion easily absorbs the diffused body fluid due to the capillary phenomenon, the body fluid easily flows through the top sheet and flows into the absorbent layer. Therefore, the body fluid diffusion properties and the body fluid permeability of the top sheet are improved when the absorbent article is repeatedly absorbed.
[ ninth mode ]
(Structure)
The absorbent article according to any one of the first to eighth embodiments, wherein the surfactant is a nonionic surfactant.
(Effect)
According to the ninth aspect of the present invention, the surfactant derived from the gel lotion can be made more sustainable and slowly-releasing, and the irritation of the gel lotion to the skin can be reduced.
[ tenth mode ]
(Structure)
The absorbent article according to any one of the first to ninth aspects, wherein the surfactant has an HLB value of 7 or more and 20 or less.
(Effect)
According to the tenth aspect of the present invention, the surfactant more easily seeps out from the gel lotion, and the body fluid diffusion property when the absorbent article repeatedly absorbs the surfactant is improved.
< first embodiment >
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the first embodiment described below.
Fig. 1 is a plan view of an absorbent article 1 according to a first embodiment of the present invention, fig. 2 is a sectional view taken along line II-II of fig. 1, and fig. 3 is a perspective view of a top sheet 2 used in the absorbent article 1 according to the first embodiment of the present invention. As shown in fig. 1 to 3, the absorbent article 1 of the present embodiment has a longitudinal direction L, a width direction W, and a thickness direction T that are orthogonal to each other. The "absorbent article" of the present invention is used as, for example, a tape-fixed disposable diaper, a pants-type disposable diaper, a urine absorption pad, a light incontinence pad, a sanitary pad, a panty liner, or the like.
[ absorbent article ]
The absorbent article of the present invention has a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent layer disposed between the top sheet and the back sheet. As shown in fig. 1 and 2, the absorbent article 1 of the present embodiment includes a gel lotion coating section 5 coated with a gel lotion along the longitudinal direction L at least in a part of the region of the non-skin side surface of the top sheet 2 that overlaps with the absorbent layer 4 in the thickness direction T. The region of the top sheet 2 includes a high fiber density portion 8 having a higher fiber density than the peripheral portion.
As will be described later, the gel lotion provided in the absorbent article of the present invention contains a surfactant having a property of easily exuding to the surface of the gel lotion together with the hydrocarbon oil, but in the present embodiment, since the region of the top sheet 2 includes the high fiber density portion 8 having a higher fiber density than the peripheral portion in the recessed portion 6 arranged along the longitudinal direction L as described later, the body fluid and the surfactant exuded to the surface of the gel lotion easily diffuse from the non-skin surface side of the raised portion 7 of the top sheet 2 toward the high fiber density portion 8 in the top sheet 2 by capillary action, and the diffusion of the body fluid in the longitudinal direction L is improved by the action of the diffused surfactant. Therefore, the absorbent article 1 of the present embodiment has excellent diffusion of body fluid in the longitudinal direction L during repeated absorption. The high fiber density portion 8 may be, for example, a bottom portion extending in the longitudinal direction L in the recessed portion 6, or a compressed portion (embossed portion) continuously or intermittently located in the recessed portion 6.
In the present embodiment, the mechanism of improving the diffusion of body fluid during repeated absorption by disposing a gel lotion containing a surfactant on the non-skin surface side of the convex portions 7 in the top sheet 2 is estimated as follows, but the absorbent article of the present invention is not limited to an absorbent article that functions by the mechanism described below.
First, the gel lotion extending in the longitudinal direction L has a property of allowing the surfactant to bleed out, but the bled-out surfactant spreads in the width direction toward the high fiber density portion in the top sheet 2 due to gravity and a difference in fiber density in the top sheet 2, and the gel lotion can be automatically and widely disposed in the top sheet. Since the hydrocarbon oil contained in the gel lotion exudes similarly to the surfactant and functions as the body fluid slipping property-imparting agent, the permeation of body fluid into the absorbent layer 4 can also be improved by diffusing the exuded hydrocarbon oil in the top sheet 2.
In the present embodiment, even if the body fluid permeates the top sheet 2 to wash out the surfactant and the hydrocarbon oil, additional surfactant and hydrocarbon oil continuously exude from the inside of the gel lotion, and therefore, the body fluid absorbability and the body fluid permeability can be maintained well even when the absorption is repeated.
(gel lotion)
In the present invention, the gel lotion comprises a styrenic elastomer, a hydrocarbon oil and a surfactant. In the present embodiment, the top sheet 2 described later is provided with the gel lotion coating section 5 coated with such a gel lotion, and the surfactant is likely to bleed out to the surface of the gel lotion due to the difference in polarity between the hydrocarbon oil and the surfactant contained in the gel lotion, and therefore, the diffusion of the body fluid absorbed by the absorbent article 1 is improved by the action of the bled-out surfactant. In addition, in the present embodiment, even if the surfactant present on the surface of the top sheet 2 or the gel lotion is washed away by the body fluid, the surfactant is supplied from the inside of the gel lotion and oozes out again to the surface of the gel lotion, and thus the diffusion of the body fluid can be maintained.
(styrene-based elastomer)
The styrene-based elastomer is preferably a styrene-based elastomer having a hard segment and a soft segment, the hard segment is preferably a polystyrene block, and the soft segment is preferably a polyolefin block.
The polystyrene block used as the hard segment includes not only a block composed of a homopolymer of styrene (i.e., a polystyrene block), but also a block composed of a homopolymer of α -methylstyrene (i.e., a poly α -methylstyrene block) and a block composed of a copolymer of styrene and α -methylstyrene.
Examples of the polyolefin block used as the soft segment include a block composed of a homopolymer of polyolefin (a polyethylene block, a polypropylene block, a polybutylene block, and a polybutadiene block) and a block composed of a copolymer of polyolefin (a block composed of a copolymer of ethylene, propylene, butylene, butadiene, and the like). In the present specification, butadiene is also treated as an olefin monomer for convenience.
The soft segment also includes a hydrogenated product of a polybutadiene block and a hydrogenated product of a block composed of a copolymer of butadiene with ethylene, propylene, butene, butadiene, or the like.
In the embodiment of the present invention, as a method for disposing the hard segment and the soft segment in the styrene-based elastomer included in the gel lotion, it is preferable to dispose the hard segment at both ends and dispose one or more soft segments therebetween.
Specific examples of the styrene-based elastomer include the following styrene-based elastomers.
(i) Polystyrene-block-poly (ethylene-co-propylene)
(hereinafter, it may be abbreviated as "SEP")
(ii) Polystyrene-block-poly (ethylene-co-propylene) -block-polystyrene
(hereinafter, sometimes abbreviated as "SEPS")
(iii) Polystyrene-block-poly (ethylene-co-butylene) -block-polystyrene
(hereinafter, sometimes abbreviated as "SEBS")
(iv) Polystyrene-block-polyethylene-block-poly (ethylene-co-propylene) -block-polystyrene
(hereinafter, sometimes abbreviated as "SEEPS")
In the embodiment of the present invention, the styrene-based elastomer preferably has a weight average molecular weight of 5000 or more and 500000 or less, more preferably 10000 or more and 400000 or less, and further preferably 50000 or more and 300000 or less. By setting the weight average molecular weight to 5000 or more, the styrene-based elastomer can more easily maintain the gel structure, and by setting the weight average molecular weight to 500000 or less, the gel lotion can be prevented from becoming too hard, and the handling property of the gel lotion can be improved.
Further, the method of measuring the weight average molecular weight is described later.
In the embodiment of the present invention, the styrene-based elastomer preferably contains 10 mass% or more and 50 mass% or less of a polystyrene block and 50 mass% or more and 90 mass% or less of a polyolefin block, more preferably contains 15 mass% or more and 40 mass% or less of a polystyrene block and 60 mass% or more and 85 mass% or less of a polyolefin block, and further preferably contains 18 mass% or more and 35 mass% or less of a polystyrene block and 65 mass% or more and 82 mass% or less of a polyolefin block.
When the amount of the polystyrene block is 10% by mass or more, the polystyrene block can more easily form a microlayer structure described later. By setting the amount of the polystyrene block to 50 mass% or less, the amount of the polyolefin block capable of holding the detergent is kept at a constant level or more, and therefore, the amount of the hydrocarbon oil capable of holding tends to be kept at a constant level or more. Further, the amount of the microlayer structure of the polystyrene block increases, and the formed gel lotion becomes hard, and the wearing feeling tends to deteriorate.
In the gel lotion produced from the styrene-based elastomer, the hard segments of the styrene-based elastomer are aggregated with each other to form domains (domains) that function as crosslinking points. On the other hand, the soft segment functions as a mesh connecting the crosslinking points. When the styrene-based elastomer is mixed with the hydrocarbon oil, the soft segment of the styrene-based elastomer retains the hydrocarbon oil, while the hard segment retains a domain-forming state. As a result, the mixture of the styrene-based elastomer and the hydrocarbon-based oil (gel lotion) becomes an elastomer capable of maintaining the shape of a gel to some extent.
The hydrocarbon oil is retained only in the loose mesh of the soft segment of the styrene-based elastomer, and can move to the surface of the gel lotion together with the surfactant described later.
(Hydrocarbon oil)
The gel lotion in embodiments of the present invention comprises a hydrocarbon oil. Here, in the present specification, the "hydrocarbon oil" refers to a compound (hydrocarbon) composed of carbon and hydrogen, and has a certain fluidity at normal temperature. Examples of the hydrocarbon include chain hydrocarbons, for example, paraffin hydrocarbons (also referred to as alkanes not containing a double bond and a triple bond), olefin hydrocarbons (also referred to as alkenes containing one double bond), acetylene hydrocarbons (also referred to as alkynes containing one triple bond), hydrocarbons containing two or more bonds selected from the group consisting of a double bond and a triple bond, and cyclic hydrocarbons, for example, aromatic hydrocarbons and alicyclic hydrocarbons.
In the embodiment of the present invention, as the hydrocarbon used as the hydrocarbon oil, a chain hydrocarbon and an alicyclic hydrocarbon are preferably used, more preferably a chain hydrocarbon is used, still more preferably an alkane, an olefin, and a hydrocarbon having two or more double bonds (not including a triple bond) are used, and most preferably an alkane is used. The chain hydrocarbon includes a straight-chain hydrocarbon and a branched-chain hydrocarbon.
The hydrocarbon oil in the embodiment of the present invention preferably has a kinematic viscosity of 0.01mm at 40 ℃ 2 More than s and 80mm 2 The weight average molecular weight is preferably less than 1000.
In the present invention, the hydrocarbon oil contained in the gel lotion exudes a certain amount to the surface of the gel lotion together with the surfactant. When the hydrocarbon oil exuded to the surface of the gel lotion slips down into the absorbent layer together with body fluid such as menstrual blood and urine and disappears, the hydrocarbon oil exudes again from the gel lotion. Thereby, the gel lotion is able to release the hydrocarbon oil continuously.
In addition, in the embodiment of the present invention, in order to form the gel efficiently, the hydrocarbon oil is preferably contained in an amount of 50 mass% or more and 100 mass% or less, more preferably 60 mass% or more and 100 mass% or less, and further preferably 70 mass% or more and 100 mass% or less in the lotion component contained in the gel lotion.
(surfactant)
In the present invention, the gel lotion comprises a surfactant. As the surfactant, a cationic surfactant, an anionic surfactant, a nonionic surfactant, and the like can be cited, but in the embodiment of the present invention, it is preferable that the gel lotion contains a nonionic surfactant. In the embodiment of the present invention, since the gel lotion contains the nonionic surfactant, the surfactant derived from the gel lotion can be more sustained and slowly released, and the irritation of the gel lotion to the skin can be reduced.
(nonionic surfactant)
The nonionic surfactant is not particularly limited, and examples thereof include: ether surfactants such as polyoxyalkylene alkyl ethers and polyoxyalkylene alkylaryl ethers; an ester surfactant such as a polyglycerol fatty acid ester, a sucrose fatty acid ester, a polyoxyalkylene fatty acid ester, and a polyoxyalkylene polyol fatty acid ester, and in the embodiment of the present invention, the gel lotion preferably contains the ester surfactant.
In an embodiment of the present invention, the surfactant preferably has an HLB value of 7 or more and 20 or less, and more preferably has an HLB value of 10 or more and 18 or less. By having the HLB value of 7 or more and 20 or less, the surfactant more easily bleeds out from the gel lotion, and the diffusion property of body fluid during repeated absorption of the absorbent article is improved. Examples of the ether surfactant having an HLB of 7 or more and 20 or less include polyoxyethylene alkyl ether, polyoxypropylene alkyl ether, and polyoxyethylene alkylphenyl ether, and examples of the ester surfactant having an HLB of 7 or more and 20 or less include polyglycerol fatty acid ester, sucrose fatty acid ester, polyoxyethylene glycerol fatty acid ester (e.g., polyoxyethylene glycerol monostearate, and polyoxyethylene glycerol triisostearate), polyoxyethylene sorbitan fatty acid ester (e.g., polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monooleate, polyoxyethylene sorbitan tetraoleate, polyoxyethylene sorbitan tetrastearate, and polyoxyethylene sorbitan tetraisostearate), and polyethylene glycol fatty acid ester. As an ester surfactant other than the above-mentioned ester surfactants, CERAMELA (a surfactant having a glycolipid structure in which a fatty acid is attached to a hydroxy ester bond of mannosylerythritol) manufactured by tokyo corporation can also be used. When the ester surfactant has a fatty acid ester structure, the number of carbon atoms of the fatty acid is preferably 8 or more and 20 or less, more preferably 10 or more and 18 or less, and still more preferably 12 or more and 16 or less, in order to achieve the HLB of 7 or more and 20 or less.
The HLB value is a value indicating the degree of affinity of a surfactant for water and oil, and is calculated using the following formula in "synthesis and application of a surfactant" (field, temple, 27097, (1957), page 501).
HLB value = [ (Σ inorganic value)/(Σ organic value) ] × 10
The HLB value is taken from the range of 0 to 20, and the closer to 0, the higher the lipophilicity, and the closer to 20, the higher the hydrophilicity.
(other lotion ingredients)
The gel lotion may further contain, in addition to the hydrocarbon oil, other lotion components used as lotion components in the production of gel lotions in the art.
(various measured values)
In the present specification, the kinematic viscosity is measured in accordance with JIS K2283: 2000 "kinematic viscosity test method", using a Cannon-Fenske countercurrent viscometer at a test temperature of 40 ℃.
In addition, the concept that the weight average molecular weight includes a polydisperse compound (e.g., a compound produced by sequential polymerization, an ester formed from a plurality of fatty acids and a plurality of aliphatic monohydric alcohols) and a single compound (e.g., an ester formed from one fatty acid and one aliphatic monohydric alcohol) means that the average molecular weight is within the range of N i Molecular weight M i In the group consisting of molecules (i =1, 2 \8230;), mw is determined by the following formula:
Mw＝ΣN i M i 2 /ΣN i M i 。
in the present specification, the weight average molecular weight refers to a value in terms of polystyrene determined by gel filtration chromatography (GPC).
The measurement conditions of GPC include, for example, the following conditions.
Model: high-speed liquid chromatogram prepared by Hitachi high technology (manufactured by Kabushiki Kaisha)
A chromatographic column: SHODEX KF-801, KF-803, and KF-804 manufactured by SHOWA DENKO K.K.)
Eluent: THF
Flow rate: 1.0 mL/min
Driving amount: 100 μ L
And (3) detection: RI (differential refractometer)
(amount of each component)
In the embodiment of the present invention, the gel lotion preferably contains 1 mass% or more and 20 mass% or less of the surfactant, more preferably 2 mass% or more and 15 mass% or less of the surfactant, and further preferably 2 mass% or more and 10 mass% or less of the surfactant, from the viewpoint of improving the diffusion of the body fluid during repeated absorption.
In an embodiment of the present invention, the gel lotion preferably contains the styrene elastomer and the hydrocarbon oil at a ratio of 1 part by mass or more and 30 parts by mass or less and 70 parts by mass or more and 99 parts by mass or less, more preferably contains the styrene elastomer and the hydrocarbon oil at a ratio of 2 parts by mass or more and 20 parts by mass or less and 80 parts by mass or more and 98 parts by mass or less, and further preferably contains the styrene elastomer and the hydrocarbon oil at a ratio of 3 parts by mass or more and 15 parts by mass or less and 85 parts by mass or more and 97 parts by mass or less, respectively, based on 100 parts by mass of the total of the styrene elastomer and the hydrocarbon oil. By setting the ratio of the styrene-based elastomer to 1 part by mass or more, the formed gel lotion has sufficient elastic force, and the shape of the gel lotion can be easily maintained even when body pressure is applied when the absorbent article is worn. By setting the ratio of the styrene-based elastomer to 30 parts by mass or less, the gel lotion formed can be inhibited from having excessively high elasticity and hardly giving a feeling of discomfort when worn.
In most of conventional lotion coating agents, a method of making the active ingredient highly viscous (to be made into a viscous state) is employed in order to fix the active ingredient at a predetermined position. However, when the viscosity of the aqueous dispersion is increased, the active ingredient is encapsulated in the detergent coating agent or the like, and it is difficult to exhibit the function thereof. Further, most of the conventional lotion coating agents are merely adhesive bodies, and when body pressure such as wearing pressure is applied, there is a problem that the lotion coating agents are not fixed at a predetermined position and move into the absorbent article, and thus are hard to continuously act on the skin of the wearer.
On the other hand, the gel lotion used in the present invention exhibits behavior as an elastomer in a range of applied body pressure and the like. Therefore, even if a high body pressure is applied to the gel lotion, the gel lotion stays elastically deformed and is not pressed between the fibers of the top sheet and the like, and returns to its original position by elastic recovery when the body pressure is low. Therefore, the hydrocarbon oil and the surfactant contained in the gel lotion can exert their functions at desired positions.
(other Components)
The gel lotion used in the present invention may contain other components within a range not to impair the effects of the present invention.
Examples of the other components include antioxidants such as BHT (2, 6-di-tert-butyl-p-cresol), BHA (butylated hydroxyanisole), propyl gallate, and the like; and natural zeolites such as analcime, chabazite, heulandite, natrolite, stilbite, and smithsonite, and synthetic zeolites.
(Top sheet)
As described above, the absorbent article of the present invention includes the gel lotion coating section described later on at least a part of the region overlapping the absorbent layer in the thickness direction of the fibrous sheet selected from the top sheet and the sheet that can be disposed between the top sheet and the absorbent layer, but as shown in fig. 2, the absorbent article 1 of the present embodiment includes the gel lotion coating section 5 on the non-skin side surface of the top sheet 2. By providing the gel lotion coating section 5 on the non-skin side surface of the top sheet 2, the gel lotion hardly blocks the permeation of body fluid through the top sheet 2, and therefore the absorbent article 1 easily absorbs body fluid from the entire surface of the top sheet 2. Therefore, the body fluid permeability, which is the property of the top sheet 2 to transmit the donor fluid, can be maintained satisfactorily.
As shown in fig. 3, the top sheet 2 used in the absorbent article 1 of the present embodiment has a wavy cross-section in which the concave portions 6 and the convex portions 7 are alternately provided along the longitudinal direction L with respect to the width direction W, the convex portions are formed on the non-skin side surfaces of the concave portions 6, and the concave portions are formed on the non-skin side surfaces of the convex portions 7. As shown in fig. 2, the top of the convex portion formed on the non-skin-side surface of the concave portion 6 (the non-skin-side surface of the bottom of the concave portion 6) is held in contact with the skin-side surface of the absorbent layer 4, and the top sheet 2 has the convex portion 7 and the concave portion 6 which form a wave-shaped cross section. In the present invention, it is preferable that the amount of the gel lotion present on the non-skin side surface of the depressed portion is smaller than the amount of the gel lotion present on the non-skin side surface of the depressed portion, but in the present embodiment, as described later, the gel lotion is present mainly on the non-skin side surface of the depressed portion 7, and therefore the surfactant that has oozed out from the gel lotion on the non-skin side surface of the depressed portion 7 is likely to diffuse along the width direction W to the depressed portion 6 along the width direction W by gravity. This can improve the diffusion of the body fluid in the longitudinal direction L in the concave portions 6 as well as in the convex portions 7.
(concave and convex parts and gel lotion coating part)
As shown in fig. 1 to 3, in the present embodiment, the concave portions 6 and the convex portions 7 are alternately arranged with respect to the width direction W and arranged along the longitudinal direction L. The gel lotion coating section 5 is provided along the longitudinal direction L in a recessed section formed on the non-skin side surface of the convex section 7. In the present invention, the gel lotion contains the surfactant, but as described above, in the absorbent article 1 of the present embodiment, the body fluid is easily diffused in the longitudinal direction L by the action of the gel lotion at the convex portions 7, and the body fluid moved from the convex portions 7 is easily transmitted in the thickness direction T at the concave portions 6, but since the concave portions 6 and the convex portions 7 are present in the longitudinal direction L, the gel lotion coating portions 5 are also arranged along the longitudinal direction L, and therefore, the diffusion of the body fluid at the time of repeated absorption of the absorbent article 1 and the body fluid permeability of the top sheet 2 are both improved. Further, since the gel lotion coating portion 5 is provided in the recessed portion formed on the non-skin-side surface of the convex portion 7, the body fluid easily permeates from the recessed portion 6 of the top sheet 2 toward the absorbent layer 4, and the body fluid permeability of the top sheet 2 is improved.
In the present invention, the concave portions and the convex portions are not limited to the form of being arranged alternately in the width direction W and along the longitudinal direction L, and may be arranged alternately in the longitudinal direction L and along the width direction W.
In the present invention, the gel lotion coating portion 5 is not limited to the embodiment in which it is provided only in the recessed portion of the convex portion 7 on the non-skin surface side, and may be provided in at least a part of the region overlapping with the absorbent layer in the thickness direction, and for example, the following forms are possible: the gel lotion is also present on the non-skin surface side of the recessed portion, and the amount of the gel lotion present on the non-skin surface side of the recessed portion is smaller than the amount of the gel lotion present on the non-skin surface side of the raised portion. In the present invention, the gel lotion coating section is not limited to the form in which it is provided on the non-skin side surface of the top sheet, and may be provided on the skin side surface or the non-skin side surface of a sheet that can be disposed between the top sheet and the absorbent layer. In the embodiment of the present invention, the gel lotion has a strong tendency not to permeate in the thickness direction T of the top sheet 2, and tends to be present on the surface of the concave portion of the convex portion 7 on the non-skin surface side.
In the present invention, the gel lotion is not limited to being continuously provided in the longitudinal direction, and may be provided intermittently along the longitudinal direction.
In the embodiment of the present invention, the concave portion and the convex portion can be formed by embossing or gear machining. Here, the gear machining is performed by: the gear processing is performed by loading and stretching a blank sheet between a shaping device provided with a pair of upper and lower stretching rollers, wherein the pair of upper and lower stretching rollers are provided with a plurality of ridges and grooves between adjacent ridges, which are arranged in parallel with each other at a constant interval in a roller width direction along an outer peripheral surface, and the ridges of one stretching roller are meshed with the grooves of the other stretching roller. The distance between the apexes of the adjacent projections is, for example, 2.0 to 5.0mm. The difference in height between the top of the convex portion and the bottom of the concave portion is, for example, 0.2 to 2mm.
(high fiber Density portion)
In the absorbent article of the present invention, the region of the fibrous sheet provided with the gel lotion coating section has a high fiber density section having a higher fiber density than the peripheral section.
As shown in fig. 3, in the present embodiment, the recessed portion 6 of the top sheet 2 has a high fiber density portion 8 having a higher fiber density than the raised portion 7 along the longitudinal direction L. The high fiber density portion 8 is, for example, a portion of the web pressed against the concave groove of one of the stretching rollers by the top of the ridge of the other stretching roller in the embossing or gear processing. This makes it easy for the body fluid or the surfactant that has oozed out onto the surface of the gel lotion to diffuse into the high fiber density portions 8 by capillary action, and thus makes it possible to improve the diffusion of the body fluid in the longitudinal direction L, and also makes it easy for the body fluid that has diffused into the recessed portions 6 to be absorbed into the high fiber density portions 8 by capillary action, and therefore the body fluid easily passes through the top sheet 2 toward the absorbent layer 4. Therefore, the body fluid diffusion property during repeated absorption of the absorbent article 1 and the body fluid permeability of the top sheet 2 are improved.
(absorbing layer)
The absorbent article of the present invention has an absorbent layer disposed between the top sheet and the back sheet. In the absorbent article of the present invention, the type of the absorbent layer is not particularly limited, and may be an absorbent body composed of water-absorbent fibers such as fluff pulp and a super-absorbent polymer, or an absorbent sheet in which a super-absorbent polymer is held between nonwoven fabrics. In the present embodiment, the absorbent layer 4 may have an absorbent layer embossed pattern, not shown, formed on the surface of the absorbent layer 4 in one or more directions intersecting the longitudinal direction L. With such a configuration, the absorbent layer flower pattern formed on the surface of the absorbent layer 4 can diffuse the body fluid that has permeated the top sheet 2 and reached the surface of the absorbent layer 4 in one or more directions intersecting the longitudinal direction L, and thus the diffusion of the body fluid during repeated absorption of the absorbent article 1 is improved.
< second embodiment >
Hereinafter, a second embodiment of the present invention will be described in detail with reference to the drawings. In the following description, the configuration common to the first embodiment may be omitted. The present invention is not limited to the second embodiment described below.
Fig. 4 is a plan view of an absorbent article 1' according to a second embodiment of the present invention, fig. 5 is a cross-sectional view at V-V in fig. 4, and fig. 6 is a perspective view of a top sheet 2' used in the absorbent article 1' according to the second embodiment of the present invention. As shown in fig. 4 to 6, the absorbent article 1' of the present embodiment has a longitudinal direction L, a width direction W, and a thickness direction T that are orthogonal to each other. As shown in fig. 4, the absorbent article 1' according to the second embodiment of the present invention is different from the absorbent article 1 according to the first embodiment of the present invention shown in fig. 1 to 3 in that: the recessed portions 6' and the raised portions 7' of the top sheet 2', and the gel lotion coating portion 5' and the high fiber density portion 8' have a zigzag pattern in plan view.
(Top sheet)
As shown in fig. 5, the absorbent article 1' of the present embodiment includes the gel lotion coating portions 5' on the non-skin side surface of the top sheet 2', but as shown in fig. 6, the concave portions 6' and the convex portions 7' of the top sheet 2' used in the absorbent article 1' of the present embodiment are alternately arranged with respect to the width direction W and the width direction W, that is, arranged in a zigzag pattern, the convex portions are formed on the non-skin side surface of the concave portions 6', and the concave portions are formed on the non-skin side surface of the convex portions 7', and have a wavy cross section. As shown in fig. 5, the top of the convex portion formed on the non-skin-side surface of the concave portion 6 '(the non-skin-side surface at the bottom of the concave portion 6') is held in contact with the skin-side surface of the absorbent layer 4.
(concave and convex parts and gel lotion coating part)
As shown in fig. 4 to 6, in the present embodiment, the concave portions 6 'and the convex portions 7' are arranged in a zigzag pattern. Further, a gel lotion application part 5 'is provided in a concave part formed on the non-skin-side surface of the convex part 7'. In the present embodiment, the gel lotion contains the surfactant, and as described in the first embodiment, since the convex portions 7' which easily diffuse the body fluid in the planar direction by the action of the gel lotion and the concave portions 6' through which the body fluid moved from the convex portions 7' easily passes are present in a zigzag pattern, the body fluid diffusion property during repeated absorption of the absorbent article 1' and the body fluid permeability of the top sheet 2' are both improved.
In the present embodiment, the concave portions and the convex portions can be formed by embossing or gear machining. The distance between the apexes of the adjacent projections is, for example, 2.0 to 5.0mm. The difference in height between the top of the convex portion and the bottom of the concave portion is, for example, 0.2 to 2mm.
(high fiber Density portion)
In the absorbent article of the present invention, the region of the fibrous sheet provided with the gel lotion coating section has a high fiber density section having a higher fiber density than the peripheral section.
As shown in fig. 3, in the present embodiment, the high fiber density portion 8 'having a higher fiber density than the convex portion 7' is present in the concave portion 6 'of the top sheet 2'. The high fiber density portion 8' is, for example, a portion of the web pressed against the grooves of the zigzag pattern of one of the stretching rollers by the top of the ridges of the zigzag pattern of the other stretching roller in the embossing or gear processing. Thus, the recessed portions 6 'easily absorb the diffused body fluid by capillary action, and thus the body fluid easily passes through the top sheet 2' toward the absorbent layer 4. Therefore, the liquid diffusibility in the planar direction upon repeated absorption of the absorbent article 1 'and the liquid permeability of the top sheet 2' are improved.
< third embodiment >
Hereinafter, a third embodiment of the present invention will be described in detail with reference to the drawings. In the following description, a description of a configuration common to the first embodiment may be omitted. The present invention is not limited to the third embodiment described below.
Fig. 7 is a cross-sectional view of an absorbent article 1 ″ according to a third embodiment of the present invention, which corresponds to fig. 2 of the first embodiment. The absorbent article 1 "of the present embodiment has a top sheet 2", a back sheet 3, and an absorbent layer 4 disposed between the top sheet 2 "and the back sheet 3, and an auxiliary sheet 9 is disposed between the top sheet 2" and the absorbent layer 4. The present embodiment is different from the absorbent article 1 according to the first embodiment of the present invention shown in fig. 1 to 3 in that: the top sheet 2 "is provided with no concave and convex portions, the auxiliary sheet 9 is provided with concave and convex portions, and the gel lotion coating portion 5" is provided on the non-skin side surface of the convex portion of the auxiliary sheet 9.
In the present embodiment, it is assumed that the concave portions and the convex portions disposed on the auxiliary sheet 9 are concave portions and convex portions disposed alternately in the longitudinal direction L with respect to the width direction W, but the concave portions and the convex portions provided in the absorbent article of the present invention are not limited to such an embodiment, and the concave portions and the convex portions may be disposed alternately in the width direction W with respect to the longitudinal direction L or may be disposed alternately in the width direction W and the width direction W, that is, in a zigzag pattern.
Since the gel lotion coating portions 5 are provided on the non-skin side surfaces of the convex portions of the auxiliary sheet 9, the body fluid permeability of the top sheet 2 ″ is further improved, and the diffusion of body fluid during repeated absorption can be improved by the auxiliary sheet 9. Further, since the gel lotion coating portion is provided on the non-skin side surface of the convex portion, the permeation of the body fluid in the auxiliary sheet 9 is hardly hindered, and therefore, the body fluid does not remain in a part of the auxiliary sheet 9, and the absorbent article 1 ″ easily absorbs the body fluid from the entire surface of the top sheet 2 ″ positioned on the upper layer of the auxiliary sheet 9. Therefore, the liquid diffusibility during repeated absorption of the absorbent article 1 "and the liquid permeability of the top sheet 2" can be maintained satisfactorily.
The following embodiments of the present invention will be explained below.
One aspect (embodiment 11) of the present invention is an absorbent article including an absorbent and a fabric sheet including fibers and disposed on a skin side of the absorbent, wherein the fabric sheet includes a gel lotion containing a styrene-based elastomer, a hydrocarbon, and a surfactant, and at least a part of the gel lotion is disposed as a plurality of thin film portions extending along a plurality of fiber portions constituting the fibers.
In the absorbent article of the present embodiment, at least a part of the gel lotion is disposed as a predetermined film portion. Further, the hydrocarbon constituting the gel lotion imparts a lotion function to the skin of the wearer, and the surfactant constituting the gel lotion contributes to making the gel lotion thin and hydrophilizing the gel lotion. The hydrophilized gel lotion has affinity for a liquid such as a body fluid, and the liquid easily comes into contact with the film portion made of the gel lotion, and a part of the surfactant dissolves in the liquid in contact with the film portion, thereby exhibiting a liquid transfer function of easily transferring the liquid to the absorbent body.
On the other hand, after the liquid has been transferred to the absorbent body, the film portion made of the gel lotion exhibits a liquid-return suppressing function of suppressing the liquid in the absorbent body from returning to the wearer side. The liquid return inhibition function tends to be as follows: when the absorbent article repeatedly absorbs liquid, the surfactant in the film portion moves to the liquid, and the more hydrophobic the film portion is, the higher the liquid return suppressing function is.
As described above, the absorbent article of the present embodiment can impart a lotion function to the skin of the wearer by the film section made of the gel lotion, and can exhibit a liquid transfer function and a liquid return suppression function.
In another aspect (aspect 12) of the present invention, in the absorbent article according to aspect 11, each of the plurality of film portions extends in a planar direction of the fabric sheet.
In the absorbent article of the present embodiment, each of the plurality of film portions extends in the planar direction of the fabric sheet, and therefore, the washing function and the rewet suppression function by the gel lotion can be effectively exhibited.
In still another aspect (aspect 13) of the present invention, in the absorbent article according to aspect 11 or 12, each of the plurality of film portions has a thickness equal to or thinner than the thickness of the fibers.
In the absorbent article of the present embodiment, each of the plurality of film portions has a predetermined thickness, and therefore, the gel lotion can efficiently exhibit a lotion function, a liquid transfer function, and a liquid return suppression function.
In still another aspect (aspect 14) of the present invention, in the absorbent article according to any one of the above aspects 11 to 13, the fabric sheet includes a first fiber portion and a second fiber portion that constitute the plurality of fiber portions, the first fiber portion and the second fiber portion intersect with each other at an intersection point thereof, and at least a part of the plurality of film portions is disposed over the first fiber portion, the intersection point, and the second fiber portion.
In the absorbent article of the present embodiment, at least a part of the plurality of film portions is arranged in the above-described predetermined relationship with the fiber portion, and therefore, the liquid-return suppressing function can be further exhibited.
In still another aspect (aspect 15) of the present invention, in the absorbent article according to aspect 14, a relationship between the following expressions (1) and (2) is provided between a length a of at least a part of the plurality of film portions in contact with the first fiber portion, a length b of at least a part of the plurality of film portions in contact with the second fiber portion, and a length c of at least a part of the plurality of film portions in contact with an imaginary bisector of the first fiber portion and the second fiber portion:
0.5a＜c…(1)
0.5b＜c…(2)。
in the absorbent article of the present embodiment, at least a part of the plurality of film portions is arranged in the above-described predetermined relationship with the fiber portion, and therefore, the liquid-return suppressing function can be further exhibited.
In still another aspect (aspect 16) of the present invention, in the absorbent article according to any one of aspects 11 to 15, at least a part of the plurality of film portions is disposed over the plurality of fiber portions in the entirety of the peripheral edge portions thereof.
In the absorbent article of the present embodiment, the liquid-return suppressing function can be further exhibited because at least a part of the plurality of film portions is disposed in the above-described predetermined relationship with the fiber portion.
In still another aspect (aspect 17) of the present invention, in addition to the absorbent article according to any one of the above aspects 11 to 16, the absorbent article includes a liquid-permeable sheet having a skin-side surface and a non-skin-side surface, and the fabric sheet constitutes the liquid-permeable sheet.
In the absorbent article of this embodiment, the fabric sheet constitutes the liquid-permeable sheet, and therefore, the gel lotion can further exhibit the function of a lotion. In the absorbent article of the present embodiment, the fabric sheet constitutes the liquid-permeable sheet, and therefore, the liquid transfer function can be rapidly exhibited with respect to the liquid that has reached the liquid-permeable sheet that is the absorbent article. In the absorbent article of the present embodiment, since the fabric sheet constitutes the liquid-permeable sheet, the return of liquid can be suppressed at a position closer to the wearer, and therefore, the liquid-return suppressing function can be further exhibited.
In still another aspect (aspect 18) of the present invention, in the absorbent article according to aspect 17, an amount of the gel lotion disposed on the non-skin side surface is larger than an amount of the gel lotion disposed on the skin side surface.
In the absorbent article of this embodiment, since the amount of the gel lotion disposed on the non-skin side surface is larger than the amount of the gel lotion disposed on the skin side surface, the gel lotion hardly prevents the liquid that has reached the liquid-permeable sheet from penetrating into the liquid-permeable sheet, and the liquid transfer function can be further exhibited. In addition, in the absorbent article of this embodiment, since the gel lotion disposed on the non-skin side can exhibit the liquid-return inhibiting function at a position away from the wearer, even when excessive body pressure is applied and the liquid absorbed by the absorbent body is returned to the wearer side, the wearer is less likely to come into contact with the returned liquid.
In still another aspect (aspect 19) of the present invention, in the absorbent article according to the above aspect 17 or 18, the liquid-permeable sheet includes a plurality of convex portions and a plurality of concave portions, and at least a part of the plurality of film portions is disposed on each of the plurality of convex portions.
In the absorbent article of the present embodiment, since the film portion made of the gel lotion is disposed at the convex portion, the convex portion which comes into contact with the liquid reaching the liquid-permeable sheet first can promptly exhibit the liquid transfer function. Further, the thin film portion disposed on the convex portion can suppress the return of the liquid at a position closer to the wearer, and therefore, the liquid return suppressing function can be further exhibited.
In still another aspect (aspect 20) of the present invention, in the absorbent article according to aspect 19, an amount of the gel lotion disposed in each of the plurality of convex portions is larger than an amount of the gel lotion disposed in each of the plurality of concave portions.
In the absorbent article of this embodiment, since the amount of the gel lotion disposed on the convex portions is larger than the amount of the gel lotion disposed on the concave portions, the surfactant present in the film portion can be dissolved in the liquid at the convex portions that first come into contact with the liquid that has reached the liquid-permeable sheet, and the liquid can be rapidly transferred to the concave portions, and the liquid transferred from the convex portions to the concave portions can be rapidly transferred to the absorbent body through the concave portions having a small amount of the gel lotion, and the liquid transfer function can be further exhibited. Further, since the thin film portion disposed in a large amount at the convex portion can suppress the return of the liquid at a position closer to the wearer, the liquid return suppressing function can be further exhibited.
In still another aspect (aspect 21) of the present invention, in the absorbent article according to the above aspect 19 or 20, a fiber density of each of the plurality of concave portions is higher than a fiber density of each of the plurality of convex portions.
In the absorbent article of the present embodiment, since the fiber density of the concave portions is higher than that of the convex portions, the concave portions can easily take in the liquid present in the convex portions, and the liquid transfer function can be further exhibited. Further, since the liquid returning from the absorbent body is more likely to be present in the concave portions than in the convex portions, the liquid return suppressing function can be further exhibited.
In still another aspect (aspect 22) of the present invention, in the absorbent article according to any one of the aspects 19 to 21, each of the plurality of convex portions and each of the plurality of concave portions are alternately arranged in a predetermined direction.
In the absorbent article of the present embodiment, the convex portions and the concave portions are alternately arranged in the predetermined direction, and therefore the liquid transfer function and the liquid return suppressing function are easily further exhibited.
In still another aspect (aspect 23) of the present invention, in the absorbent article according to any one of the aspects 19 to 22, the plurality of convex portions and the plurality of concave portions extend in a first direction, respectively, and are alternately arranged in a second direction intersecting the first direction.
In the absorbent article of the present embodiment, the convex portions and the concave portions are alternately arranged in the predetermined direction, and therefore the liquid transfer function and the liquid return suppressing function are easily further exhibited.
(definitions of each)
Hereinafter, preferred embodiments of the absorbent article of the present invention will be described in detail with reference to the drawings. In the present specification, unless otherwise specified, "an object (for example, an absorbent article, a fabric sheet, or the like) placed on a horizontal plane in an expanded state as viewed from above in the vertical direction along the thickness direction of the object" will be simply referred to as "in plan view".
The various directions and the like used in the present specification are as follows unless otherwise specified.
In the present specification, "longitudinal direction" means a direction in which the length of a longitudinal object (for example, an absorbent article) is long in a plan view, "width direction" means a direction in which the length of the longitudinal object is short in a plan view, "thickness direction" means a vertical direction perpendicular to an object placed on a horizontal plane in a state after being developed, "and the longitudinal direction, the width direction, and the thickness direction are in a mutually orthogonal relationship. In the present specification, the "planar direction" refers to a "direction in which a plane of a substantially sheet-shaped object (for example, a fabric sheet or the like) extends in a plan view," and the planar direction and the thickness direction are in a mutually orthogonal relationship.
In the present specification, the term "longitudinal axis C" refers to a central axis C that is located at the center of a longitudinal object and extends in the width direction W The relatively close proximal side is referred to as "the inner side in the longitudinal direction", and will be referred to as "the inner side in the longitudinal direction of the longitudinal object with respect to the central axis C W The relatively distant distal side is referred to as the "longitudinally outward side". Similarly, "a central axis C extending in the longitudinal direction and located at the center in the width direction of a vertically long object is defined as a central axis C L The relatively close proximal side is referred to as "inner side in the width direction", and will be referred to as "relative to the central axis C in the width direction of the longitudinal object L The relatively distant side is referred to as "the outer side in the width direction".
In the present specification, unless otherwise specified, in the thickness direction of the absorbent article, "the proximal side relatively close to the skin surface of the wearer when the absorbent article is worn" is referred to as "skin side", and "the distal side relatively distant from the skin surface of the wearer when the absorbent article is worn" is referred to as "non-skin side".
[ absorbent article ]
The absorbent article of the present invention is an absorbent article comprising an absorbent body and a fabric sheet comprising fibers and disposed on the skin side of the absorbent body, wherein the fabric sheet comprises a gel lotion containing a styrene-based elastomer, a hydrocarbon and a surfactant, and at least a part of the gel lotion is disposed in a plurality of film portions extending along a plurality of fiber portions constituting the fibers.
In the present invention, the hydrocarbon constituting the gel lotion imparts a lotion function to the skin of the wearer, and the surfactant constituting the gel lotion contributes to making the gel lotion thin and hydrophilizing the gel lotion. The gel lotion hydrophilized with the surfactant has affinity for a liquid such as a body fluid, the liquid is easily brought into contact with the film portion made of the gel lotion, and a part of the surfactant is dissolved in the liquid in contact with the film portion, thereby exhibiting a liquid transfer function of transferring the liquid to the absorbent body.
On the other hand, the film portion formed of the gel lotion can exhibit a liquid-returning suppressing function of suppressing the liquid in the absorbent core from returning to the wearer's side after the liquid has been transferred to the absorbent core.
As described above, the absorbent article of the present invention can impart a lotion function to the skin of the wearer by the film section made of the gel lotion, and can exhibit a liquid transfer function and a liquid-return inhibiting function.
In the present invention, the fabric sheet is not particularly limited as long as it is disposed on the skin side of the absorbent body, and examples thereof include liquid-permeable sheets such as top sheets and auxiliary sheets used in general absorbent articles. The type of fabric is not particularly limited, and examples thereof include nonwoven fabric, woven fabric, and knitted fabric.
The type of absorbent article to which the present invention is applied is not particularly limited, and the present invention can be applied to various absorbent articles such as a panty liner, (light) incontinence pad, and disposable diaper, in addition to the sanitary napkin according to the embodiment described later.
Hereinafter, the absorbent article of the present invention will be described in more detail by using an example applied to a sanitary napkin as an embodiment of the present invention.
As shown in fig. 8, a sanitary napkin 10, which is an example of the "absorbent article" of the present invention, has a longitudinal direction L and a width direction W in plan view, and has a vertically long outer shape in which both end portions in the longitudinal direction L protrude so as to draw an arc outward in the longitudinal direction L, and a pair of wing portions in which both end portions in the width direction W of the sanitary napkin 10 protrude outward in the width direction W in a substantially trapezoidal shape in a substantially central portion in the longitudinal direction L.
As shown in fig. 9, the sanitary napkin 10 includes, as main components in the thickness direction T: a liquid-permeable sheet 20, the liquid-permeable sheet 20 being positioned relatively on the skin side T 1 And is composed of a nonwoven fabric having a specific uneven structure having projections 210 and recesses 220 described later; a liquid-impermeable sheet 30, the liquid-impermeable sheet 30 being positioned on the non-skin side T in a manner facing each other 2 A hydrophobic nonwoven fabric or a resin film; and an absorber 40, wherein the absorber 40 is positioned between the two sheets and has liquid absorption and liquid retention properties.
The sanitary napkin 10 further includes, as a structural member: a pair of side sheets 50, the pair of side sheets 50, 50 being on the skin side T of the liquid-permeable sheet 20 1 At both ends in the width direction W; and a garment-attachment adhesive portion (not shown) disposed on the non-skin side T of the liquid-impermeable sheet 30 2 Of the surface of (a).
As shown in fig. 9 to 11, the liquid-permeable sheet 20 of the sanitary napkin 10 according to the present embodiment includes a gel lotion 60 containing a styrene-based elastomer, a hydrocarbon, and a surfactant, and at least a part of the gel lotion 60 is disposed as a plurality of film portions 610 extending along a plurality of fiber portions of the structural fibers 2F of the liquid-permeable sheet 20.
That is, in the present embodiment, the fabric sheet constitutes the liquid-permeable sheet 20. In this way, when the fabric sheet is configured as the liquid-permeable sheet 20, the lotion function by the gel lotion 60 can be more effectively exerted, and in addition, the liquid transfer function can be rapidly exerted with respect to the liquid such as the body fluid supplied to the liquid-permeable sheet 20. In addition, in the present embodiment, since the thin film portion 610 of the gel lotion 60 in the liquid-permeable sheet 20 can suppress the return of the liquid transferred to the absorbent body 40 at a position closer to the wearer, the liquid return suppressing function can be more effectively exhibited.
Hereinafter, various members that can be used in the absorbent article of the present invention will be described in more detail using the sanitary napkin 10.
[ liquid-permeable sheet ]
In the sanitary napkin 10, as shown in fig. 8 and 9, in the liquid-permeable sheet 20, portions other than the portions overlapping the pair of side sheets 50, 50 in the thickness direction T are disposed at positions that can be brought into direct contact with the skin of the wearer, and are constituted by liquid-permeable sheet members through which body fluid such as menstrual blood discharged from the wearer can pass.
As shown in fig. 1 and 2, the liquid-permeable sheet 20 has at least the skin side T of the absorber 40 1 Is provided to extend in the longitudinal direction L and the width direction W so as to cover the entire surface of the sanitary napkin and has a vertically long outer shape similar to the outer shape of the sanitary napkin 10. In the present invention, the outer shape and the size of the liquid-permeable sheet may be any outer shape and size according to various applications, as long as the skin-side surface of the absorbent body is not exposed.
In the present invention, the sheet-like member that can be used as the liquid-permeable sheet is not particularly limited as long as it has various characteristics (for example, liquid permeability, texture, flexibility, strength, and the like) that can be used as the liquid-permeable sheet of the absorbent article, and for example, nonwoven fabrics such as a hot-air nonwoven fabric, a spunbond nonwoven fabric, and a point-bond nonwoven fabric can be preferably used. Furthermore, the nonwoven fabric may be subjected to hydrophilization treatment.
The structural fiber of the nonwoven fabric is not particularly limited, and examples thereof include hydrophilic fibers such as cellulose fibers and hydrophilized thermoplastic resin fibers (e.g., hydrophilized olefin resins and hydrophilized polyester resins). These fibers may be used alone, or two or more kinds of fibers may be used in combination.
The weight and thickness of the nonwoven fabric per unit area are not particularly limited, and may be, for example, 25g/m 2 ～50g/m 2 The weight per unit area of (2) and a thickness of 0.5mm to 3.0 mm.
The weight per unit area of the nonwoven fabric can be measured in accordance with JIS L1906 of 5.2, and the thickness of the nonwoven fabric can be measured in a non-contact manner by using a laser displacement meter (for example, high-precision two-dimensional laser displacement meter LJ-G series (model: LJ-G030) manufactured by kirschmann). In the measurement of the thickness of the nonwoven fabric, the measurement is performed on the measurement target portions at five different positions, and the average value thereof is used.
In the above embodiment, as shown in fig. 8 to 10, the liquid-permeable sheet 20 has a concavo-convex structure in which a plurality of convex portions 210 and a plurality of concave portions 220 are alternately arranged along a second direction (a direction corresponding to the width direction W of the sanitary napkin 10 in the present embodiment) intersecting with the first direction, and the plurality of convex portions 210 are directed toward the skin side T in the thickness direction T 1 The plurality of concave portions 220 protrude and extend in the first direction (in the present embodiment, the direction corresponding to the longitudinal direction L of the sanitary napkin 10), and the plurality of concave portions 220 are located on the non-skin side T in the thickness direction T 2 Recessed and extending in the first direction in parallel with the convex portion 210.
When the liquid-permeable sheet 20 has such a concavo-convex structure, the body fluid supplied to the liquid-permeable sheet 20 can be diffused in the first direction (i.e., the longitudinal direction L of the sanitary napkin 10) along the concave portions 220 and directed toward the non-skin side T of the liquid-permeable sheet 20 2 And (4) soaking. In the present embodiment, the gel lotion 60 is disposed along the longitudinal direction L of the sanitary napkin 10 in the projections 210, and therefore the gel lotion 60 worksIn the concave portion 220, the body fluid is easily diffused along the longitudinal direction L, and the body fluid moved from the convex portion 210 is easily transmitted in the thickness direction T.
In the present invention, the first direction in which the convex portions and the concave portions of the liquid-permeable sheet extend is not limited to the form of the above-described embodiment (i.e., the direction corresponding to the longitudinal direction of the absorbent article), and any direction such as the direction corresponding to the width direction of the absorbent article can be adopted. In the above embodiment, the convex portions and the concave portions are disposed on the entire liquid-permeable sheet, but the present invention is not limited to such an arrangement form, and the convex portions and the concave portions may be disposed only on predetermined portions of the liquid-permeable sheet. In this case, it is preferable that the convex portions and the concave portions are arranged at least in a region overlapping with the absorber in the thickness direction.
In the present specification, the convex portions and the concave portions of the liquid-permeable sheet can be divided as follows. That is, when the liquid-permeable sheet is placed on a horizontal plane such that the surface on the non-skin side is the lower side, the portion with the highest height from the horizontal plane is the top of the convex portion, the portion with the lowest height from the horizontal plane is the bottom of the concave portion, the portion protruding upward from a virtual reference horizontal plane extending at a position bisecting the thickness d of the entire liquid-permeable sheet (i.e., at a position where the distances in the thickness direction from the top and bottom are each d/2) is the "convex portion", and the portion recessed downward is the "concave portion".
The convex portions and the concave portions can be distinguished from each other by observing a cross section of the liquid-permeable sheet along the second direction under magnification by a magnifying observation means such as a scanning electron microscope and by taking a photograph or an image of the cross section.
In the above embodiment, as shown in fig. 9 and 10, the non-skin side T of the liquid-permeable sheet 20 2 Has a surface having a contact surface with a skin side T 1 The concave-convex structure of the convex portion and the convex portion corresponding to the convex portion 210 and the concave portion 220 has a hollow structure inside the convex portion 210. In the absorbent article of the present invention, the surface structure of the liquid-permeable sheet on the non-skin side is not limited to such a structure, and examples thereof includeThe liquid-permeable sheet may have a flat structure without irregularities (that is, the internal structure of the convex portion is a solid structure), but from the viewpoint of liquid permeability (particularly, permeability of repeatedly supplied body fluid) and the like, it is preferable that the surface structure on the non-skin side of the liquid-permeable sheet has an irregular structure having concave portions and convex portions corresponding to the convex portions and concave portions on the skin side as in the above-described embodiments (that is, the internal structure of the convex portions is a hollow structure).
In the above embodiment, the liquid-permeable sheet 20 has a high-density portion (not shown) in the concave portion 220, in which the fiber density is relatively higher than that of the convex portion 210. When the liquid-permeable sheet has such a high-density portion in the concave portion, the body fluid supplied to the liquid-permeable sheet is easily drawn into the high-density portion by capillary action, and therefore, the body fluid can be easily transferred to the absorbent body.
In the determination of the density (fiber density) in each part (convex part, concave part, etc.) of the liquid-permeable sheet, the part to be compared in the density (for example, a size of 1mm × 1 mm) can be observed under magnification at a magnification of about 20 to 100 times by a magnification observation means such as a scanning electron microscope, and the determination can be made visually from the number of fibers per unit area.
Specific structures of the convex portions and the concave portions of the liquid-permeable sheet are not particularly limited, and for example, the height of the convex portions (i.e., the distance in the thickness direction from the virtual reference horizontal plane to the top portion) is in the range of 0.1mm to 3.0mm, the depth of the concave portions (i.e., the distance in the thickness direction from the virtual reference horizontal plane to the bottom portion) is in the range of 0.1mm to 3.0mm, and the pitch of the plurality of convex portions (i.e., the distance between the top center of two convex portions adjacent in the second direction) is in the range of 1.0mm to 10.0 mm.
The width of the convex portion (i.e., the length of the portion of the convex portion in the second direction where the length in the second direction is the largest) is, for example, in the range of 0.5mm to 5.0mm, and the width of the concave portion (i.e., the length of the portion of the concave portion in the second direction where the length in the second direction is the largest) is, for example, in the range of 0.5mm to 5.0mm. The width of the convex portion and the width of the concave portion may be the same or different for each of the convex portion and the concave portion.
The pitch and width of the convex portions and the concave portions can be measured from a plane image or a cross-sectional image of the nonwoven fabric under a non-pressurized state by observing the nonwoven fabric under magnification using a magnifying observation means such as a scanning electron microscope. The heights, depths, thicknesses, and the like of the projections and the recesses may be measured by observing with a magnifying observation means such as a scanning electron microscope under magnification in the same manner as the above pitches and widths, but may be measured in a non-contact manner using a laser displacement meter.
The method of forming the above-described uneven structure in the liquid-permeable sheet is not particularly limited, and any shaping method such as a gas blowing method of continuously blowing a gas (for example, air) to one surface of the web before forming the nonwoven fabric, a gear processing method using a pair of shaping rollers arranged vertically, an embossing method, a method using vacuum forming or compression forming, or the like can be used. Among them, the gas blowing method, the gear processing method, and the embossing method are preferable because the uneven structure is shaped and a high-density portion having a high fiber density is easily formed in the concave portion.
The liquid-permeable sheet may be joined to the non-skin side surfaces of the pair of side sheets, may be joined to the skin side surface or the non-skin side surface of the absorbent body, may be joined to the skin side surface of the liquid-impermeable sheet, or may be joined to both of them. The joining method is not particularly limited, and any joining means such as a hot-melt adhesive and thermal fusion can be used.
In the sanitary napkin 10 of the above embodiment, the liquid-permeable sheet 20 contains the gel lotion 60 containing a styrene-based elastomer, a hydrocarbon and a surfactant, and at least a part of the gel lotion 60 is arranged to form a plurality of film portions 610 as shown in fig. 10, and the plurality of film portions 610 extend along a plurality of fiber portions of the structural fibers 2F constituting the liquid-permeable sheet 20.
[ gel lotion ]
As mentioned above, comprises a styrenic elastomer, a hydrocarbon and a surfactantThe gel lotion 60 of the nature agent is disposed on the skin side T of the absorber 40 1 At least a part of the liquid-permeable sheet 20 at the position(s) in (b) is formed with a plurality of film portions 610 extending along a plurality of fiber portions of the structural fibers 2F of the liquid-permeable sheet 20, whereby the above-described lotion function, liquid transfer function and liquid-returning suppressing function are imparted to the liquid-permeable sheet 20.
The gel lotion 60 penetrates into the inside from the front surface (non-skin side surface in the present embodiment) of the liquid-permeable sheet 20, and in this penetrated portion, a thin film portion 610 composed of the gel lotion 60 as shown in fig. 11 is formed between the plurality of structural fibers of the liquid-permeable sheet 20.
The gel lotion 60 acts on the hydrocarbons and arranges the surfactants contained in the gel lotion 60 on the surface thereof, thereby reducing the surface tension of the hydrocarbons and increasing the viscosity, and thus facilitating the formation of the thin film portions 610 between the structural fibers of the liquid-permeable sheet 20.
The liquid-permeable sheet 20 has a plurality of film portions 610 formed therein, and the form thereof varies depending on the number, arrangement, inter-fiber distance, and the like of the structural fibers involved in the formation of the film portions 610.
For example, in the present embodiment, as shown in fig. 11, the entire peripheral edge portion of one thin film portion 610 of the plurality of thin film portions 610 is disposed on the plurality of fiber portions, and a part of the peripheral edge portion of the other thin film portion 610 is disposed on the plurality of fiber portions. When at least a part of the plurality of thin film portions is arranged as in the former case, the entire peripheral edge portion of the thin film portion is arranged on the plurality of fiber portions, and therefore the liquid return suppressing function can be more effectively exhibited.
As described above, in the present invention, as shown in fig. 12, it is preferable that the liquid-permeable sheet (fabric sheet) includes the first fiber part 2F of the plurality of fiber parts constituting the structural fiber 1 And a second fiber portion 2F 2 The first fiber part 2F 1 And a second fiber portion 2F 2 At their intersection point CP, at least a part of the plurality of film portions 610 cross the first fiber portion 2F 1 Intersection point CP and second fiber portion 2F 2 Is ground configured and has advantagesOptionally, in the first fiber part 2F 1 Length a of contact with second fibre portion 2F 2 Length b of contact and first fibre portion 2F 1 And a second fiber portion 2F 2 Imaginary bisector L of F The lengths c of the contacts have the following relationships of formula (1) and formula (2).
0.5a＜c…(1)
0.5b＜c…(2)
When at least a part of the plurality of thin film portions 610 is arranged in such a predetermined relationship with the fiber portion, the above-described liquid-back suppressing function can be more effectively exhibited.
Preferably, each of the plurality of film portions has a thickness equal to or thinner than that of the structural fiber of the liquid-permeable sheet (fabric sheet). When each of the plurality of film portions has such a thickness, the gel lotion can efficiently exhibit a cleaning function, a liquid transfer function, and a liquid return suppressing function.
In the above embodiment, as shown in fig. 9 and 10, the gel lotion 60 is disposed on the non-skin side surface of the liquid-permeable sheet 20 and permeates in the thickness direction T, and the amount of the gel lotion disposed on the non-skin side surface of the liquid-permeable sheet 20 is larger than the amount of the gel lotion disposed on the skin side surface. In the absorbent article of the present invention, the gel lotion may be disposed on either the skin-side surface or the non-skin-side surface of the liquid-permeable sheet (fabric sheet), but when the amount of the gel lotion disposed on the non-skin-side surface of the liquid-permeable sheet is larger than the amount of the gel lotion disposed on the skin-side surface as in the above-described embodiment, the gel lotion hardly prevents the body fluid reaching the liquid-permeable sheet from penetrating into the liquid-permeable sheet, and can more reliably exhibit the above-described liquid transfer function.
In the above embodiment, as shown in fig. 9 and 10, the liquid-permeable sheet 20 includes a plurality of convex portions 210 and a plurality of concave portions 220, and at least a part of the plurality of thin film portions 610 is disposed in each of the plurality of convex portions 210. In this way, when the thin film portion 610 made of the gel lotion 60 is disposed on the convex portion 210 of the liquid-permeable sheet 20, the convex portion 210 that is first brought into contact with the body fluid that has reached the liquid-permeable sheet 20 can quickly exhibit the liquid transfer function. Further, the thin film portion 610 disposed in the convex portion 210 can suppress the return of the body fluid at a position closer to the wearer, and therefore, the above-described liquid return suppressing function can be more effectively exhibited.
In the above embodiment, as shown in fig. 9 and 10, the gel lotion 60 is disposed on each of the plurality of projections 210 of the liquid-permeable sheet 20, and the amount of the gel lotion 60 disposed on each of the plurality of projections 210 is larger than the amount of the gel lotion 60 disposed on each of the plurality of recesses 220. In the absorbent article of the present invention, the gel lotion may be disposed in any of the plurality of convex portions and concave portions of the liquid-permeable sheet (fabric sheet), but when the amount of the gel lotion disposed in each of the plurality of convex portions is larger than the amount of the gel lotion disposed in each of the plurality of concave portions as in the above-described embodiment, the surfactant present in the film portion can be dissolved in the body fluid in the convex portions that are first in contact with the body fluid that has reached the liquid-permeable sheet, and the body fluid can be rapidly transferred to the concave portions, and the body fluid transferred from the convex portions to the concave portions can be rapidly transferred to the absorbent body through the concave portions having a smaller amount of the gel lotion, and therefore, the above-described liquid transfer function can be more reliably exhibited. Further, since the thin film portion disposed in a large amount on the convex portion can suppress the return of the body fluid at a position closer to the wearer, the above-described liquid return suppressing function can be more effectively exhibited.
In the above embodiment, the fiber density of each of the plurality of concave portions 220 of the liquid-permeable sheet 20 is higher than the fiber density of each of the plurality of convex portions 210, and the high-density portions are formed in each of the plurality of concave portions 220. As described above, when the fiber density of the concave portions 220 is higher than that of the convex portions 210, the liquid present in the convex portions 210 is easily drawn in by the capillary phenomenon into the concave portions 220, and the liquid transfer function can be more reliably exhibited. Further, since the body fluid returning from the absorber 40 is more likely to be present in the concave portions 220 than in the convex portions 210, the above-described liquid-return suppressing function can be more effectively exhibited.
In the above embodiment, each of the plurality of projections 210 and each of the plurality of recesses 220 of the liquid-permeable sheet 20 are alternately arranged in the predetermined direction (i.e., the second direction), and therefore the liquid transfer function and the liquid-return suppressing function described above are easily further exhibited.
Further, since the plurality of convex portions 210 and the plurality of concave portions 220 each extend in the first direction (direction corresponding to the longitudinal direction L of the sanitary napkin 10), the body fluid supplied to the liquid-permeable sheet 20 is easily diffused in the first direction, and particularly, the body fluid repeatedly supplied is excellent in diffusion property, and the liquid transfer function and the liquid-return suppressing function are easily exhibited further.
In the present invention, the arrangement form of the plurality of film portions made of the gel lotion is not particularly limited, but preferably, each of the plurality of film portions extends in the plane direction of the liquid-permeable sheet (fabric sheet). When each of the plurality of film portions extends in the plane direction of the liquid-permeable sheet (fabric sheet), the cleaning function and the rewet suppression function by the gel lotion can be effectively exhibited.
Hereinafter, various components of the gel lotion containing the styrene-based elastomer, the hydrocarbon and the surfactant which can be used in the present invention will be described in detail.
(styrene elastomer)
Examples of the styrene-based elastomer used for the gel lotion include styrene-based elastomers having a hard segment and a soft segment. Examples of the hard segment include styrene-based hard segments, and examples of the soft segment include olefin-based soft segments.
Examples of the hard segment of the styrene-based compound include polystyrene, poly α -methylstyrene, and a copolymer of styrene and α -methylstyrene.
Examples of the olefin soft segment include homopolymers of polyolefins (for example, polyethylene, polypropylene, polybutene, and polybutadiene), copolymers of polyolefins, and hydrogenated products thereof.
The arrangement form of the hard segment and the soft segment in the styrene-based elastomer is not particularly limited, but it is preferable that the hard segments are arranged at both ends of a molecular chain composed of one or more kinds of soft segments.
In addition, in the styrene-based elastomer, since a network structure in a mesh shape is formed by a plurality of condensed domains formed by the interaction of the hard segment and the soft segment connecting the plurality of condensed domains, a function as an elastomer can be exhibited, and a gel state can be maintained even under a temperature condition near the body temperature (about 35 to about 40 ℃). Such a mesh-like network structure also has a function of holding the hydrocarbon and the surfactant so as to be releasable.
Specific examples of the styrene-based elastomer include styrene-based block copolymers such as styrene-ethylene-propylene block copolymer (SEP), styrene-ethylene-propylene-styrene block copolymer (SEPs), styrene-ethylene-butylene-styrene block copolymer (SEBS), and styrene-ethylene-propylene-styrene block copolymer (SEEPS).
Weight average molecular weight (M) of styrene-based elastomer W ) Although not particularly limited, the content is preferably 5000 to 500000, more preferably 10000 to 400000, and still more preferably 50000 to 300000. When the weight average molecular weight is 5000 or more, the styrene-based elastomer easily maintains a gel structure, and when the weight average molecular weight is 500000 or less, the gel lotion does not become excessively hard, and the wearer can hardly feel uncomfortable or uncomfortable when wearing the absorbent article.
The weight average molecular weight can be determined by taking Tetrahydrofuran (THF) as a mobile phase, measuring by Gel Permeation Chromatography (GPC) under the following conditions, and calculating the weight average molecular weight in terms of polystyrene.
< GPC measurement Condition >
Model: high-speed liquid chromatogram obtained by Hitachi high technology (manufactured by Hitachi Kagaku Co., ltd.)
A chromatographic column: SHODEX KF-804 manufactured by SHOWA DENKO K.K.)
Solvent: THF (tetrahydrofuran)
Flow rate: 1.0 mL/min
Driving amount: 100 μ L
And (3) detection: RI (differential refractometer)
The styrene-based elastomer preferably contains 10 mass% to 50 mass% of a styrene-based block component and 50 mass% to 90 mass% of an olefin-based block component, more preferably contains 15 mass% to 40 mass% of a styrene-based block component and 60 mass% to 85 mass% of an olefin-based block component, and still more preferably contains 18 mass% to 35 mass% of a styrene-based block component and 65 mass% to 82 mass% of an olefin-based block component.
When the amount of the styrene-based block component is 10% by mass or more, the amount of the hard segment (i.e., styrene-based block component) forming the coagulated domain can be kept constant or more, and therefore, the styrene-based elastomer easily forms a network structure in a mesh shape. On the other hand, when the amount of the styrene-based block component is 50 mass% or less, the amount of the olefin-based block component that holds hydrocarbons or the like can be secured to a certain amount or more, and therefore, the amount of hydrocarbons or the like that can be held can be increased, and further, since the amount of the aggregation domains formed by the hard segments (styrene-based block component) can be limited to a certain amount or less, the gel after application to the liquid-permeable sheet (fabric sheet) does not become excessively hard, and discomfort or discomfort to the wearer can be made less likely to occur when the absorbent article is worn.
The amount of the styrene-based elastomer to be incorporated in the gel lotion is not particularly limited, but is preferably 1 part by mass or more and 30 parts by mass or less, more preferably 2 parts by mass or more and 20 parts by mass or less, and still more preferably 3 parts by mass or more and 15 parts by mass or less, based on 100 parts by mass of the total of the styrene-based elastomer and the hydrocarbon. When the amount of the styrene-based elastomer is 1 part by mass or more, the gel lotion has sufficient elasticity, and therefore, even when body pressure is applied when the absorbent article is worn, the shape of the gel lotion can be easily maintained. When the amount of the styrene-based elastomer blended is 30 parts by mass or less, the elasticity of the gel lotion does not become too high, and discomfort or discomfort to the wearer can be hardly caused.
(hydrocarbons)
The hydrocarbon used in the gel lotion has a certain fluidity at normal temperature, and when it comes into contact with the skin of the wearer of the absorbent article, it imparts a lotion function to the skin of the wearer.
The hydrocarbon is not particularly limited, and may have a linear, branched or cyclic structure, or may have a saturated bond or an unsaturated bond. Examples of such hydrocarbons include chain hydrocarbons such as olefinic hydrocarbons (olefins containing one double bond), paraffinic hydrocarbons (alkanes containing neither double bonds nor triple bonds), acetylenic hydrocarbons (alkynes containing one triple bond), and hydrocarbons containing two or more double bonds and/or triple bonds; cyclic hydrocarbons such as aromatic hydrocarbons and alicyclic hydrocarbons.
Among such hydrocarbons, a chain hydrocarbon or an alicyclic hydrocarbon is preferably used, more preferably a chain hydrocarbon, still more preferably a paraffin hydrocarbon, an olefin hydrocarbon or a hydrocarbon containing two or more double bonds (but not including a triple bond), and particularly preferably a paraffin hydrocarbon. The chain hydrocarbon includes a straight-chain hydrocarbon and a branched-chain hydrocarbon.
The hydrocarbon preferably has a kinematic viscosity of 0.01mm at 40 DEG C 2 More than s and 80mm 2 The weight average molecular weight is preferably less than 1000.
The kinematic viscosity was measured in accordance with JIS K2283: 2000 "kinematic viscosity test method", using a Cannon-Fenske countercurrent viscometer at a test temperature of 40 ℃.
In addition, the hydrocarbon contained by the gel wash, along with the surfactant, exudes an amount to the surface of the gel wash. When the hydrocarbons exuded to the surface of the gel lotion are transferred together with the body fluid and absorbed by the absorbent body, a new amount of hydrocarbons exude to the surface of the gel lotion. In this way, the gel lotion is able to release a certain amount of hydrocarbon continuously.
The amount of the hydrocarbon contained in the gel lotion is not particularly limited, but is preferably 70 parts by mass or more and 99 parts by mass or less, more preferably 80 parts by mass or more and 98 parts by mass or less, and still more preferably 85 parts by mass or more and 97 parts by mass or less, based on 100 parts by mass of the total of the styrene-based elastomer and the hydrocarbon.
When the gel lotion contains a lotion component other than a hydrocarbon, the hydrocarbon can be contained in a proportion of preferably 50% by mass or more and 100% by mass or less, more preferably 60% by mass or more and 100% by mass or less, and still more preferably 70% by mass or more and 100% by mass or less, with respect to the total mass of all the lotion components (that is, the hydrocarbon and the other lotion components).
(surfactant)
The surfactant used in the gel lotion contributes to the thinning of the gel lotion and hydrophilization of the gel lotion. In particular, since the surfactant acts on the hydrocarbons and is arranged on the surface of the hydrocarbons, the surface tension of the hydrocarbons is lowered and the viscosity is increased, and therefore, the thin film portion of the gel lotion can be easily formed between the structural fibers of the liquid-permeable sheet (fabric sheet).
Examples of the surfactant include cationic surfactants, anionic surfactants, and nonionic surfactants. Among these surfactants, nonionic surfactants are also preferably used. When such a nonionic surfactant is used, the following advantages are obtained: the surfactant can be easily and continuously released from the gel lotion, and the irritation of the gel lotion to the skin can also be reduced.
The nonionic surfactant is not particularly limited, but examples thereof include ether surfactants such as polyoxyalkylene alkyl ether and polyoxyalkylene alkylaryl ether; ester surfactants such as polyglycerin fatty acid esters, sucrose fatty acid esters, polyoxyalkylene fatty acid esters, and polyoxyalkylene polyol fatty acid esters. Among these nonionic surfactants, ester surfactants are also preferably used from the viewpoint of ease of formation of the thin film portion.
The surfactant used in the gel lotion preferably has an HLB value of 7 or more and 20 or less, and more preferably has an HLB value of 10 or more and 18 or less. When the surfactant has an HLB value of 7 or more and 20 or less, the following advantages are obtained: the surfactant that has exuded can improve the liquid diffusibility (particularly, the liquid diffusibility when a body fluid is repeatedly supplied) of the liquid-permeable sheet (fabric sheet).
Examples of the surfactant having an HLB value of 7 or more and 20 or less include ether surfactants such as polyoxyethylene alkyl ether, polyoxypropylene alkyl ether, and polyoxyethylene alkylphenyl ether; ester surfactants such as polyglycerin fatty acid esters, sucrose fatty acid esters, polyoxyethylene glycerin fatty acid esters (e.g., polyoxyethylene glycerin monostearate, polyoxyethylene glycerin triisostearate, etc.), polyoxyethylene sorbitan fatty acid esters (e.g., polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monooleate, polyoxyethylene sorbitan tetraoleate, polyoxyethylene sorbitan tetrastearate, polyoxyethylene sorbitan tetraisostearate, etc.), polyethylene glycol fatty acid esters, and the like.
As the ester surfactant other than the above-exemplified ester surfactants, for example, CERAMELA (biosurfactant having a glycolipid structure in which a fatty acid is attached to a hydroxy ester bond of mannosylerythritol) manufactured by tokyo corporation, and the like can be used.
When the ester surfactant has a fatty acid ester structure, the fatty acid preferably has 8 or more and 20 or less carbon atoms, more preferably 10 or more and 18 or less carbon atoms, and still more preferably 12 or more and 16 or less carbon atoms in order to achieve an HLB value of 7 or more and 20 or less.
In the present specification, the HLB value is a value indicating the degree of affinity of a surfactant for water and oil, and is a value calculated by the following formula in "synthesis and application of a surfactant" (field, temple, world 27097shop (1957), page 501).
HLB value = [ (Σ inorganic value)/(Σ organic value) ] × 10
The HLB value is taken from the range of 0 to 20, and the closer to 0, the higher the lipophilicity, and the closer to 20, the higher the hydrophilicity.
The amount of the surfactant to be incorporated in the gel lotion is not particularly limited, but is preferably 1 mass% or more and 20 mass% or less, more preferably 2 mass% or more and 15 mass% or less, and further preferably 2 mass% or more and 10 mass% or less with respect to the mass (100 mass%) of the gel lotion, from the viewpoints of easiness of formation of the film portion, liquid diffusibility, and the like.
(other Components)
The gel lotion used in the present invention may contain other components than the styrene-based elastomer, the hydrocarbon and the surfactant within a range not to impair the effects of the present invention.
Examples of such other components include antioxidants such as 2, 6-di-tert-butyl-p-cresol (BHT), butylated Hydroxyanisole (BHA), propyl gallate; natural zeolites such as analcime, chabazite, heulandite, natrolite, stilbite, and smithsonite; synthetic zeolites, and the like.
[ absorbent body ]
In the sanitary napkin 10 of the above embodiment, as shown in fig. 9, the absorber 40 is disposed between the liquid-permeable sheet 20 and the liquid-impermeable sheet 30, and is formed of an absorbent member having predetermined liquid-absorbing properties and liquid-retaining properties, which is capable of absorbing and retaining body fluids that have passed through the liquid-permeable sheet 20 in the thickness direction T.
As shown in fig. 8, the absorber 40 extends over a wide range in the longitudinal direction L of the sanitary napkin 10 in plan view, and has a vertically long shape in which a substantially central portion in the longitudinal direction L is tapered inward in the width direction W. The outer shape of the absorbent body is not limited to this shape, and any outer shape (for example, a rectangular shape, an oval shape, an hourglass shape, etc.) and size according to various uses and the like can be adopted.
In the present invention, the absorbent member that can be used as the absorbent body is not particularly limited as long as it can absorb and retain at least liquid such as body fluid, and any absorbent member known in the art can be used. Examples of such an absorbent member include an absorbent member in which at least one absorbent core made of an absorbent material is covered with a core wrap sheet such as a hydrophilic tissue. Examples of the absorbent material constituting the absorbent core include hydrophilic fibers, superabsorbent polymers, and the like, and more specifically, cellulose fibers such as ground pulp, cotton cloth, rayon, and acetate; a granular material comprising a high-absorbency polymer such as a sodium acrylate copolymer; and a mixture of any combination thereof.
The thickness, weight per unit area, and the like of the absorbent body are not particularly limited, and any thickness, weight per unit area, and the like can be adopted according to desired absorption performance, flexibility, and the like.
In the sanitary napkin 10, the absorber 40 is bonded to the liquid-permeable sheet 20 on the skin-side surface by any bonding means such as a hot-melt adhesive, and is bonded to the liquid-impermeable sheet 30 on the non-skin-side surface by any bonding means such as a hot-melt adhesive.
[ liquid-impermeable sheet ]
In the sanitary napkin 10 of the above embodiment, as shown in fig. 9, the liquid-impermeable sheet 30 is disposed on the non-skin side T of the absorber 40 2 The liquid-impermeable sheet member is formed to prevent permeation of body fluid discharged from a wearer and to prevent the body fluid from leaking to underwear of the wearer.
Preferably, the liquid-impermeable sheet is impermeable to liquid such as body fluid, but has predetermined air permeability. When the liquid-impermeable sheet has such air permeability, moisture released from the absorbent body (specifically, moisture from body fluid or the like absorbed and held by the absorbent body) is easily released to the outside of the absorbent article through the liquid-impermeable sheet, and therefore, it is possible to make it difficult for moisture to accumulate inside the absorbent article or between the absorbent article and the skin surface of the wearer.
In the present invention, the liquid-impermeable sheet-like member that can be used as the liquid-impermeable sheet is not particularly limited as long as it has various characteristics (for example, liquid-impermeability, flexibility, strength, and the like) that can be used as the liquid-impermeable sheet of the absorbent article, and for example, a hydrophobic nonwoven fabric formed of an arbitrary hydrophobic thermoplastic resin fiber (for example, polyolefin fiber such as Polyethylene (PE) and polypropylene (PP), polyester fiber such as polyethylene terephthalate (PET), and various composite fibers such as a core-sheath type) can be used; a porous or nonporous resin film formed of a hydrophobic thermoplastic resin such as PE or PP; a laminate in which a nonwoven fabric is bonded to the resin film; an optional liquid-impermeable sheet such as a SMS nonwoven fabric is laminated.
The thickness, weight per unit area, outer shape, and the like of the liquid-impermeable sheet are not particularly limited, and any thickness, weight per unit area, outer shape, and the like can be adopted according to the desired leakage-proof performance, air permeability, strength, and the like.
The absorbent article of the present invention is not limited to the above-described embodiments and the like, and can be appropriately combined, substituted, modified, and the like without departing from the object and the gist of the present invention. In this specification, ordinal numbers such as "first" and "second" are used to distinguish between items having the ordinal number, and do not mean the order, priority, importance, and the like of the items.
Examples
The present invention will be described below by referring to test examples, but the present invention is not limited to these test examples.
< example 1 >
2 parts of SEEPS (product of Coli, SEPTON 4055, styrene content: 30 mass%, weight average molecular weight: about 25 ten thousand) and 0.1 to 16.7 parts by mass of polysorbate 20 (product of Nichioil Co., ltd.; trade name of raw material: nonionic LT-20, HLB: 16.7) as an ester surfactant were added to 98 parts of PARLEAMEX (product of Nichioil Co., ltd.; branched hydrocarbon produced by copolymerizing liquid isoparaffin, isobutylene, and n-butene and then adding hydrogen) heated to about 140 deg.C, and kinematic viscosity at 37.8 deg.C was 10mm 2 S) was mixed for 5 hours while stirring, thereby producing a mixture, which was poured into a cylindrical vessel having a diameter of 40mm until the height was 8mm, followed by cooling the mixtureThus, a cylindrical gel lotion No.1 having a diameter of 40mm and a height of 8mm was obtained.
< example 2 >
Gel lotion No.1 was obtained in the same manner as in preparation example 1 except that 0.1 to 16.7 parts by mass of CERAMELA (biosurfactant having a glycolipid structure in which a fatty acid is attached to the hydroxyl ester bond of mannosylerythritol) dissolved in 50% of triglyceride (manufactured by Nippon oil Co., ltd., PANACET 810S) was added to liquid paraffin and heated in place of polysorbate 20 (manufactured by Nippon oil Co., ltd., nonionic LT-20, HLB: 16.7) as the ester surfactant.
< comparative example 1 >
Gel detergent No.3 was obtained in the same manner as in preparation example 1, except that no ester surfactant was added.
< evaluation >
[ evaluation of wettability of gel lotion itself ]
1 drop (0.05 ml) of the colored distilled water was dropped on the surface of gel lotion Nos. 1 to 3, and the diameter of the drop after 10 minutes was measured. The results are shown in table 1.
[ evaluation of wettability of nonwoven Fabric coated with gel lotion ]
On the top sheet (hydrophobic spun-bonded nonwoven fabric, weight per unit area 17 g/m) 2 ) In the longitudinal direction of (A), the coating layer was formed in a linear shape so as to have a coating amount of 0.2g/m, 1.0g/m and 2.0g/m (Japanese: \ 124992. In the center of the applied 20cm gel lotion, 2 drops (0.1 ml) of colored distilled water were dropped, and the state of liquid diffusion after 2 minutes had elapsed was observed, and the diffusion length of the gel lotion applied in a line shape was measured. The results are shown in table 2.
[ absorbency of absorbent article coated with gel lotion ]
On the top sheet (hydrophilic spun-bonded nonwoven fabric, weight per unit area 18 g/m) 2 ) In the above, 21 projections are formed for every 7cm width in the width directionThe gel lotions No.2 and No.3 were applied in an amount of 0.05 g/m/piece to the back surfaces of the projections. The back surface of the concave part of the top sheet and an auxiliary sheet (hydrophilic spun-bonded nonwoven fabric manufactured by Asahi Kasei Co., ltd., weight per unit area of 18 g/m) were subjected to hot embossing 2 ) The laminate was bonded, and the absorption rate and liquid diffusibility of the laminate were evaluated by the following methods.
(1) A load cylinder having a diameter of 7cm and 200g was placed on the upper surface of the top sheet, 80cc of artificial urine was injected thereinto and the time (sec) required was measured, and the liquid spread of the artificial urine on the top sheet was measured while the artificial urine in the cylinder disappeared.
(2) After 10 minutes from the start of the injection of the artificial urine, the same amount of artificial urine was injected again, and the same measurement as described above was performed.
(3) The total of three injections (total of 240 cc) was performed. The results are shown in table 3.
[ Table 1]
Figure BDA0003310031160000411
[ Table 2]
Figure BDA0003310031160000421
[ Table 3]
Figure BDA0003310031160000422
As can be seen from table 1, the droplet diameter increases as the concentration of surfactant added to the gel increases. It is considered that the reason why the expansion of the droplet diameter is large by adding a small amount of gel lotion No.2 is that the solvent itself is likely to bleed out because triglyceride is used in the solvent, and as a result, the droplet diameter of CERAMEA is increased.
As can be seen from table 2, the distilled water diffused along the gel lotion applied in a line shape. Further, the distilled water also diffused in the width direction of the gel lotion over the width of the gel lotion. Therefore, it is considered that the surfactant spreads from the gel lotion to the nonwoven fabric, and the surfactant is efficiently bled out. Furthermore, no measurement was made for gel lotion No.1.
Further, as is clear from table 3, the absorption rate of gel lotion No.2 was maintained for ten seconds up to the third time. This is presumably because, even in the case of the third injection in which the absorbent body is filled to capacity and absorption is difficult, liquid diffusion from the top sheet of the load cylinder of 7cm occurs. The liquid diffusion of the top sheet starts at the embossed portions of the concave portions and the convex portions extending in the longitudinal direction. This is considered to be because the fiber density of the embossed portion is high, and the capillary force acts.
In the case of no gel lotion (no), and in the case of no ester surfactant (No. 3), the third absorption rate decreased to twenty seconds, which is considered to be due to the fact that the fiber finish (surfactant) originally adhered to the nonwoven fabric flowed out by repeated injection of artificial urine. In gel lotion No.2, although the fiber finish adhered to the nonwoven fabric also flowed out, it could be maintained for a ten-second period, and it is considered that this was because the surfactant in the gel lotion permeated out and transferred to the embossed portion having a high fiber density, and therefore the wettability of the fibers was supplemented and the capillary force was maintained.
Description of the reference numerals
1. 1', 1' absorbent article
2. 2', 2' topsheet
3. Back sheet
4. Absorbing layer
5. 5', 5' gel lotion coating section
6. 6' recess
7. 7' convex part
8. 8' high fiber density section
9. Auxiliary sheet
10. Sanitary napkin
20. Liquid-permeable sheet
210. Convex part
220. Concave part
30. Liquid-impermeable sheet
40. Absorbent body
50. Side panel
60. Gel lotion
610. Thin film part

Claims (11)

1. An absorbent article comprising an absorber and a fabric sheet containing fibers and disposed on the skin side of the absorber,
the fabric sheet comprises a gel lotion containing a styrene elastomer, a hydrocarbon and a surfactant,
at least a portion of the gel lotion is configured as a plurality of film portions extending along a plurality of fiber portions that make up the fibers,
the absorbent article includes a liquid-permeable sheet having a skin-side surface and a non-skin-side surface, the fabric sheet constituting the liquid-permeable sheet,
the amount of the gel lotion disposed on the non-skin side is greater than the amount of the gel lotion disposed on the skin side.
2. The absorbent article according to claim 1,
each of the plurality of film portions extends in a planar direction of the fabric sheet.
3. The absorbent article according to claim 1 or 2,
each of the plurality of film portions has a thickness that is the same as or thinner than the fiber.
4. The absorbent article according to claim 1 or 2,
the fabric sheet includes a first fiber portion and a second fiber portion constituting the plurality of fiber portions, the first fiber portion and the second fiber portion intersect with each other at an intersection point thereof, and at least a part of the plurality of film portions is disposed over the first fiber portion, the intersection point, and the second fiber portion.
5. The absorbent article according to claim 4,
the relationship between the following expressions (1) and (2) is given between a length a of at least a part of the plurality of film portions in contact with the first fiber portion, a length b of at least a part of the plurality of film portions in contact with the second fiber portion, and a length c of at least a part of the plurality of film portions in contact with an imaginary bisector of the first fiber portion and the second fiber portion:
0.5a＜c …(1)
0.5b＜c …(2)。
6. the absorbent article according to claim 1 or 2,
at least a part of the thin film portions is disposed over the fiber portions in its entire peripheral edge portion.
7. The absorbent article according to claim 1,
the liquid-permeable sheet includes a plurality of convex portions and a plurality of concave portions, and at least a part of the plurality of thin film portions is disposed on each of the plurality of convex portions.
8. The absorbent article according to claim 7,
an amount of the gel lotion disposed in each of the plurality of convex portions is greater than an amount of the gel lotion disposed in each of the plurality of concave portions.
9. The absorbent article according to claim 7 or 8,
the fiber density of each of the plurality of concave portions is higher than the fiber density of each of the plurality of convex portions.
10. The absorbent article according to claim 7 or 8,
each of the plurality of convex portions and each of the plurality of concave portions are alternately arranged in a predetermined direction.
11. The absorbent article according to claim 7 or 8,
the plurality of convex portions and the plurality of concave portions extend in a first direction, respectively, and are alternately arranged in a second direction intersecting the first direction.
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