CN106794084B - Absorbent article - Google Patents

Absorbent article Download PDF

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Publication number
CN106794084B
CN106794084B CN201580055082.2A CN201580055082A CN106794084B CN 106794084 B CN106794084 B CN 106794084B CN 201580055082 A CN201580055082 A CN 201580055082A CN 106794084 B CN106794084 B CN 106794084B
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China
Prior art keywords
cyclodextrin
absorbent
liquid
layer
sheet
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Active
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CN201580055082.2A
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Chinese (zh)
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CN106794084A (en
Inventor
藤本和也
中岛海阳
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Eunija Co Ltd
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Eunija Co Ltd
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Publication of CN106794084A publication Critical patent/CN106794084A/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
    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/47—Sanitary towels, incontinence pads or napkins
    • A61F13/472—Sanitary towels, incontinence pads or napkins specially adapted for female use
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
    • A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
    • A61L15/20—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing organic materials
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
    • A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
    • A61L15/22—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing macromolecular materials
    • A61L15/26—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives thereof
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
    • A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
    • A61L15/42—Use of materials characterised by their function or physical properties
    • A61L15/46—Deodorants or malodour counteractants, e.g. to inhibit the formation of ammonia or bacteria

Abstract

The present invention provides an absorbent article which can efficiently and sufficiently exhibit the deodorizing function of cyclodextrin and the slow-release function of an active ingredient of a cyclodextrin complex. The absorbent article (1) of the present invention comprises a liquid-permeable layer (2), a liquid-impermeable layer (3), an absorbent layer (SA) located between the two layers, and a cyclodextrin-containing layer located between the absorbent layer (SA) and the liquid-impermeable layer (3).

Description

Absorbent article
Technical Field
The present invention relates to an absorbent article having an odor suppressing function.
Background
Absorbent articles such as light incontinence pads (light incontinence pads), sanitary napkins, disposable diapers, and the like are used to absorb and retain body fluids such as urine and menstrual blood discharged from a wearer. Since body fluids absorbed by the absorbent body of an absorbent article generally emit unpleasant odor, absorbent articles capable of suppressing the odor of the body fluids have been studied.
As such an absorbent article, patent document 1 discloses an absorbent article in which cyclodextrin and a cyclodextrin complex including at least 3 components complexed with cyclodextrin are located in a layer closer to the body-facing surface than the absorbent core.
Reference list
Patent document
[ patent document 1] Japanese unexamined patent publication No. 2013-545587
Disclosure of Invention
Problems to be solved by the invention
However, since body fluid such as urine discharged from a wearer immediately passes through a layer (e.g., a surface sheet) near the body-facing surface of an absorbent article, if cyclodextrin and a cyclodextrin complex are located in the layer near the body-facing surface of the absorbent article, as in the absorbent article disclosed in patent document 1, a sufficient contact time between the cyclodextrin and the cyclodextrin complex and the body fluid cannot be obtained, and the deodorizing function of cyclodextrin and the slow-release function of an active ingredient which the cyclodextrin complex has tend to be insufficient.
Accordingly, an object of the present invention is to provide an absorbent article which can efficiently and sufficiently exhibit the deodorizing function of cyclodextrin and the slow-release function of an active ingredient contained in a cyclodextrin complex.
Means for solving the problems
The absorbent article of the present invention comprises a liquid-permeable layer, a liquid-impermeable layer, an absorbent layer (absorbing layer) disposed between the two layers, and a cyclodextrin-containing layer (cyclodextrin-containing layer) disposed between the absorbent layer and the liquid-impermeable layer.
With the absorbent article of the present invention, since the cyclodextrin-containing layer is located between the absorbent layer and the liquid-impermeable layer, when bodily fluid such as urine discharged by the wearer passes through the liquid-permeable layer and is absorbed by the absorbent layer, the bodily fluid stagnates at the lower portion of the absorbent layer (i.e., the portion on the cyclodextrin-containing layer side) by the action of gravity, and the stagnant bodily fluid can contact at least one of cyclodextrin and a cyclodextrin complex in the cyclodextrin-containing layer over a wide contact area for a long period of time. As a result, the deodorizing function of cyclodextrin and the slow-release function of the active ingredient (the fragrance or deodorizing ingredient held by cyclodextrin) possessed by the cyclodextrin complex can be efficiently and sufficiently exhibited. Further, with respect to the absorbent article of the present invention, the "cyclodextrin-containing layer" means a layer including at least one of cyclodextrin and the cyclodextrin complex described below.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, an absorbent article capable of efficiently and sufficiently exhibiting the function of cyclodextrin can be provided.
Drawings
Fig. 1 is a plan view of a light incontinence pad according to the first or second embodiment of the present invention, as viewed in the thickness direction on the topsheet side in an unfolded state.
Fig. 2 is a cross-sectional end view of a mild incontinence pad according to a first embodiment of the invention, taken along line II-II' in fig. 1.
Fig. 3 is a plan view illustrating a body fluid absorbent region, a cyclodextrin disposition region, an adhesive-coated region, and a fragrance-coated region in the light incontinence pad of fig. 1.
Fig. 4 is a cross-sectional end view of a light incontinence pad according to a second embodiment of the invention, taken along line II-II' in fig. 1.
Detailed Description
Preferred embodiments of the absorbent article of the present invention will now be described in detail with reference to the accompanying drawings.
FIG. 1 shows a thickness direction D of the topsheet (liquid-permeable layer) side (i.e., the side opposite the skin of the wearer) in the unfolded stateTLooking at a plan view of a light incontinence pad 1 according to the first or second embodiment of the invention, fig. 2 is a sectional end view of the light incontinence pad 1 according to the first embodiment of the invention, taken along line II-II' of the light incontinence pad in fig. 1, and fig. 3 is a plan view illustrating the body fluid absorption zone, the cyclodextrin disposition zone, the adhesive application zone and the perfume application zone in the light incontinence pad of fig. 1. In this specification, unless otherwise indicated, the simple phrase "fromThe term "planar observation" will be used to mean "observation in the thickness direction on the liquid-permeable layer side in the developed state".
As shown in figures 1 and 3, a light incontinence pad 1 according to a first embodiment of the invention has a longitudinal direction D, seen in plan viewLLong side extending and in the width direction DWThe extended short side and both edges in the length direction are protruded to form a circular arc-shaped rectangular shape. However, the shape of the absorbent article of the present invention is not limited to this shape, and any longitudinal shape (for example, rectangular shape, oval shape, gourd-shaped shape, etc.) may be used as long as it is the longitudinal direction DLLength dimension to width direction DWThe width and the length of the strip-shaped structure can be just the same.
In the present specification, the longitudinal direction D of the absorbent article in the longitudinal direction will be orientedLExtended central axis CLIs referred to as "inner direction of width direction", and is away from the central axis CLThe direction of (b) is referred to as "widthwise outer direction". Similarly, the width direction D of the absorbent article in the longitudinal direction will be orientedWExtended central axis CWIs referred to as "inside direction in the longitudinal direction" and is away from the central axis CWThe direction of (b) is referred to as "outside direction in the longitudinal direction". In addition, the thickness direction D of the absorbent articleTThe direction toward the skin-facing surface side (skin-facing surface side) of the wearer is referred to as the skin-facing surface side, and the direction toward the opposite side (non-skin-facing surface side) of the skin-facing surface side of the wearer is referred to as the non-skin-facing surface side.
As shown in FIG. 3, the absorbent article of the present invention has a body fluid absorbent region T when viewed in plan viewAIn the width direction DWSpanning in the longitudinal direction D of the absorbent articleLExtended central axis CLIs extended and also in the length direction DLSpanning in the width direction D of the absorbent articleWExtended central axis CWExtending; and further has a region other than the body fluid absorption region. The term "body fluid absorption region" refers to a region corresponding to a body fluid discharge position of a wearer when the absorbent article is worn by the wearerDepending on the kind of absorbent article, specifically, the kind of body fluid discharged by the wearer such as urine, feces, menstrual blood, etc.; the age and sex of the wearer; the location and area of wearer's excretory opening contact; a structure of an absorption layer; among other factors, which are appropriately determined regions for each absorbent article. Body fluid absorption region TAGenerally having a longitudinal direction D of the absorbent articleLA length in the longitudinal direction of at least about 1/3 of the total length of the absorbent article, and the width direction D of the absorbent articleWIs at least about 1/3 a width-wise length of the overall length. Further, the term "region other than the body fluid absorption region" refers to a region other than the body fluid absorption region extending from the body fluid absorption region in the outside direction of the longitudinal direction and the width direction, and such a region includes a region which does not absorb the body fluid discharged by the wearer and a region which does not correspond to the body fluid discharge position of the wearer but can absorb the body fluid discharged by the wearer.
As shown in fig. 2, a light incontinence pad 1 according to a first embodiment of the present invention is constituted by various members, including a topsheet 2 as a liquid-permeable layer comprising any desired liquid-permeable sheet, such as a liquid-permeable nonwoven fabric, a plastic film, etc., in the thickness direction DTOn the side opposite the skin of the wearer; a back sheet 3 as a liquid-impermeable layer comprising any desired liquid-impermeable sheet such as a liquid-impermeable nonwoven fabric or a plastic film, which is located on the non-skin-opposing side of the wearer; absorbent sheet S as an absorbent layerAAn absorbent material comprising at least an absorbent polymer 6 sandwiched between two liquid-permeable sheets 7, 7' (for example, air-permeable nonwoven fabric) and positioned between the front sheet 2 and the back sheet 3; a cyclodextrin-containing layer on the absorbent sheet SAA cyclodextrin-containing absorbent layer (cyclodextrin-containing absorbent layer)4 including cyclodextrin and a mixture of an absorbent polymer and a liquid-retentive substance (e.g., pulp) is sandwiched between two carrier sheets 5, 5' including liquid-permeable sheets (e.g., tissues) and a back sheet 3; a pair of side gather sheets 8,8' extending in the longitudinal direction, which are folded and bonded to the stacked body from the front sheet to the back sheet so as to sandwich the stacked body from both outer sides in the width direction, and have inner sides in the width directionAs a free end to form a gather; linear elastic members 9,9 'located in the vicinity of the folding lines of the pair of side gusset sheets 8,8', two of which are arranged in each pair of side gusset sheets.
For the present embodiment, the absorbent sheet SA(absorbent layer) is not particularly limited as long as it has a function of absorbing and retaining body fluid such as urine and the like discharged from the wearer; however, it is preferably an absorbent sheet comprising two liquid-permeable sheets such as air-permeable nonwoven fabrics or the like sandwiching an absorbent material comprising at least the above-mentioned absorbent polymer 6. The term "absorbent polymer" as used herein is a polymer capable of absorbing and retaining water, and may for example be a polymer having a three-dimensional network structure of suitably crosslinked water-soluble polymers. In particular, it may be a granular or fibrous polymer of the starch, acrylic or amino acid type. The absorbent polymer absorbs not only water but also odor containing ammonia components and the like, and thus exhibits a deodorizing effect.
Further, the absorbent polymer can be suitably used even as an absorbent polymer containing a deodorizing component in which a desired deodorizing component is integrated with absorbent polymer particles. Here, the "deodorizing component" refers to a component capable of absorbing an odor component such as ammonia or dimethylamine and eliminating odor caused by these odor components. Examples of such deodorizing ingredients include activated carbon; alumina; a zeolite; a cyclodextrin; and bactericidal deodorant components such as zeolite substituted with bactericidal metal cations such as silver or copper, or complexes having quaternary ammonium salt compounds having bactericidal action attached to the surface of activated carbon or alumina; and combinations of 2 or more of these deodorizing ingredients.
When urea in urine is decomposed by urease enzyme existing in bacteria in urine, ammonia component is generated to generate ammonia odor; however, since the above bactericidal deodorant components function as bactericides against bacteria in urine, they can reduce the decomposition of urea by urease to prevent the generation of ammonia odor, and thus are advantageous deodorant components in this respect. Further, even when a bactericide having a similar bactericidal action to such bactericidal deodorant component is used, the effect of preventing generation of ammonia odor can be obtained, and for example, a bactericide-containing absorbent polymer obtained by, for example, spraying an aqueous solution containing such a bactericide onto absorbent polymer particles, which is integrated with the bactericide, is applicable to the present invention.
The absorbent polymer containing the deodorizing component can be obtained by mixing together and integrating absorbent polymer particles and the deodorizing component. The absorbent polymer containing the deodorizing component can also be obtained by adding water to absorbent polymer particles to form a water-containing gel, and then mixing the absorbent polymer in a water-containing gel state with the deodorizing component and integrating them.
According to the present invention, the absorbent sheet S can be usedAThe absorbent material (absorbent layer) is not particularly limited as long as it contains an absorbent polymer, and they include not only the absorbent polymer but also a liquid retentive material composed of a water absorbent fiber such as pulp. When the absorbent material contains an absorbent polymer and water-absorbent fibers, the content of the absorbent polymer is in the range of 10 to 90% of the mass of the water-absorbent fibers per unit area of the absorbent layer. According to the present invention, the absorbent material used is preferably a material that does not contain a liquid retentive substance such as pulp from the viewpoint that body fluid such as urine discharged by the wearer effectively contacts cyclodextrin in the cyclodextrin-containing absorbent layer located on the non-skin-facing surface side of the absorbent sheet.
Further, for the absorbent sheet SAThe liquid-permeable sheet (absorbent layer) is not particularly limited as long as it is a sheet having liquid permeability, and for example, a hydrophilic nonwoven fabric such as a breathable nonwoven fabric, a spunbonded fabric, a laminated nonwoven fabric (e.g., SBS nonwoven fabric), a tissue fabric, or the like can be used. From the viewpoint of liquid permeability, the liquid-permeable sheet is preferably a breathable nonwoven fabric.
For the light incontinence pad 1 of this embodiment, the absorbent sheet SACan be manufactured by the following method: an absorbent polymer 6 (absorbent material) is interposed between the two liquid-pervious sheets 7, 7' coated with the adhesive G and in the width direction D of the two liquid-pervious sheets 7, 7WA central region of, andwidth direction D of two liquid-permeable sheets 7, 7WThe region (absorbent polymer disposition region 11) on both side edges of the absorbent polymer and the region (absorbent polymer non-disposition region 12) in which the absorbent polymer is not disposed are arranged such that the absorbent polymer is oriented in the width direction DWThe absorbent polymer is sandwiched between the two liquid-permeable sheets 7, 7 in a manner not existing in the regions adjacent on both sides, and then each is sandwiched along the longitudinal direction DLIs oriented in the width direction DWInner fold (also referred to as "frame-like folded"). When the absorbent polymer non-arranged regions 12 on both widthwise edge sides of the two liquid-permeable sheets 7, 7' are folded inward in the widthwise direction, they can be folded in either direction of the skin-facing surface side or the non-skin-facing surface side. By thus folding each absorbent polymer non-disposition region of the two liquid-permeable sheets sandwiching the absorbent polymer, the absorbent polymer is less likely to leak from the absorbent sheet, and the portion (folded portion) of the folded absorbent sheet has high rigidity due to the 4-layer multilayer structure, so that when the absorbent article is worn, even if it is moved from the widthwise direction D of the absorbent article due to, for example, the wearer's legsWThe absorbent sheet can also resist deformation when a force is applied to the outside. As a result, it is possible to secure an absorption area of body fluid such as urine discharged by the wearer and maintain satisfactory absorption performance as an absorbent article.
Further, in the absorbent article of the present invention, the absorbent sheet (absorbent layer) is not limited to the above-described embodiment, and may be formed, for example, in the following manner: the absorbent material is held in the central region in the width direction and/or the longitudinal direction of the liquid-permeable sheets so that one liquid-permeable sheet is folded and sandwiched, or after being surrounded by 3 or more liquid-permeable sheets, the region adjacent to the central region, that is, the region where the absorbent material is not disposed (absorbent material non-disposed region), is folded toward the inside in the width direction and/or the longitudinal direction along the folding line extending in the longitudinal direction and/or the width direction.
Since the absorbent sheet formed in this way is located on the lower side (non-skin-facing side) of the top sheet as a liquid-permeable sheet, when bodily fluids such as urine discharged by the wearer pass through the top sheet, the absorbent polymers in the absorbent sheet immediately absorb the bodily fluids such as urine together with the odor. Further, since the absorbent polymer swells at this time, the thickness of the absorbent sheet increases, so that even when body pressure by the body weight of the wearer is applied to the absorbent article, the swollen absorbent polymer functions as a pressure buffer layer, and for example, body fluid having been absorbed by the absorbent polymer hardly permeates back to the topsheet (liquid-permeable layer). Further, since the body fluid passes through the absorbent sheet by the action of gravity, contact with cyclodextrin in the absorbent layer containing cyclodextrin positioned on the non-skin-facing surface side of the absorbent sheet can be sufficiently ensured. Further, when body fluid stagnates in the absorbent sheet for a long time, the body fluid spreads over a wide range in the in-plane direction of the absorbent sheet, so that the body fluid can contact the cyclodextrin over a wide area. As a result, in the absorbent layer containing cyclodextrin, the deodorizing function of cyclodextrin and the slow-release function of the active ingredient possessed by the cyclodextrin complex can be exhibited more efficiently and effectively.
Further, as shown in fig. 2 and 3, the light incontinence pad 1 of the present embodiment is provided on the absorbent sheet SAIn the width direction D ofWIn the longitudinal direction D between the two liquid-permeable sheets 7 and 7LExtended area (perfume application area T)F、T'F) Either or both, coated with a liquid fragrance. By applying the liquid fragrance at these positions, the liquid fragrance does not come into contact with the hot melt adhesive or the absorbent polymer used for fixing the absorbent sheet in the light incontinence pad 1, and therefore does not cause a decrease in the adhesive force of the adhesive or the absorption performance of the absorbent polymer, and the fragrance effect of the liquid fragrance can be exhibited. Further, by coating the liquid fragrance at a position away from the cyclodextrin in the cyclodextrin-containing layer, the liquid fragrance is less likely to be absorbed by the cyclodextrin which is not included, and the fragrance effect of the liquid fragrance can be continuously exhibited. The liquid fragrance used in the absorbent article of the present invention is not particularly limited, and any liquid fragrance known in the art, such as natural fragrance or synthetic fragrance; however, in view of the use of the absorbent article for the human body, it is preferable to useNatural fragrances derived from plants.
In the absorbent article of the present invention, the position where the absorbent sheet (absorbent layer) is provided is not particularly limited as long as it is located between the topsheet and the cyclodextrin-containing layer, and for example, another absorbent sheet may be provided at a position other than the skin-facing surface side of the cyclodextrin-containing layer.
As shown in FIG. 2, the light incontinence pad 1 of the present embodiment has an adhesive G for fixing an absorbent polymer 6 on an absorbent sheet SAThe absorbent polymer arrangement region (2) is intermittently applied to both the liquid-permeable sheet 7 positioned on the skin-facing surface side of the absorbent polymer and the liquid-permeable sheet 7' positioned on the non-skin-facing surface side of the absorbent polymer 6. The form of applying the adhesive G is not particularly limited as long as the adhesive G is intermittently applied, and for example, it may be in the form of a plurality of lines extending in the longitudinal direction of the liquid-permeable sheets 7, 7 'and arranged in the width direction, in the form of a plurality of lines extending in the width direction of the liquid-permeable sheets 7, 7' and arranged in the longitudinal direction, or in the form of a plurality of dots. The adhesive G is not particularly limited, and for example, a hot melt adhesive or the like can be used.
When the adhesive G is intermittently applied to the absorbent sheet S in this mannerAIn the absorbent polymer disposition region, body fluid such as urine discharged by the wearer in the light incontinence pad 1 passes through the part of the liquid-permeable sheet 7 where the adhesive G is not applied, and is fixed to the absorbent sheet SAThe absorbent polymer 6 in (b) does not inhibit the absorbent sheet S from absorbingACan inhibit the absorption of the absorbent sheet SAMovement of the absorbent polymer 6 in the inner portion.
Further, as shown in fig. 2, the adhesive G in the light incontinence pad 1 of the present embodiment is positioned in the thickness direction D between the position of the adhesive G applied to the liquid-permeable sheet 7 positioned on the skin-facing surface side of the absorbent polymer 6 and the position of the adhesive G applied to the liquid-permeable sheet 7' positioned on the non-skin-facing surface side of the absorbent polymer 6TAre applied to the liquid-permeable sheets 7 and 7' so as not to overlap each other. When the adhesive G is applied in this manner, a gap is formed between the liquid-permeable sheet 7 and the liquid-permeable sheet 7Less likely to cause odor due to retention of body fluid such as urine in the gap. Further, since there is no absorbent sheet SABody fluid such as urine absorbed by the inner absorbent polymer 6 can flow through the portion of the liquid-permeable sheet 7' where the adhesive G is not applied and to the absorbent sheet SAFrom the non-skin-contact surface side of the absorbent sheet SAThe discharged body fluids and the odor caused by these body fluids can be absorbed together by the cyclodextrin containing layer described below.
The absorbent sheet S of the light incontinence pad 1 of this embodimentACan be obtained by: for example, on the surface (top side) of the skin-facing surface side of the liquid-permeable sheet 7', except for the area where the below-described compressed groove 14 is to be formed, the adhesive G is intermittently applied, and the absorbent polymer is placed in the area where the adhesive G has been intermittently applied, and then the liquid-permeable sheet 7 on which the adhesive G has been intermittently applied on the surface (bottom side) on the non-skin-facing surface side is covered and joined thereto, and finally the absorbent polymer non-arranged area 12 is folded.
The absorbent sheet S obtained in this manner is seen in plan view due to the compressed grooves 14 in the regions where the liquid-permeable sheets 7' are to be formedAIs not coated with the adhesive G for fixing the absorbent polymer 6, and thus the absorbent sheet SAThe absorbent polymer disposition region 11 has an absorbent polymer non-existing region 13 where the absorbent polymer 6 is not locally present. The extent of the absorbent polymer non-existing region 13 may be suitably determined depending on the manner of the compressed groove 14 to be formed; however, it is preferably determined to extend outward from the periphery of the compression groove along a prescribed dimension (e.g., 2 to 5 mm).
Further, the light incontinence pad 1 of the present embodiment has a structure extending from the skin-facing surface of the topsheet 2 to at least the absorbent sheet SAThe inner compressed grooves 14 of (a), the compressed grooves 14 being formed in the absorbent polymer non-existing region 13 as viewed in plan. The compressed groove 14 may be formed by, as viewed in plan: laminated topsheet 2 (liquid-permeable layer), absorbent sheet SA(absorbent layer), cyclodextrin-containing layer and back sheet (liquid-impermeable layer), and hot embossing is performed in the absorbent polymer-non-existing region 13 from the skin-facing surface side of the top sheet 2. The lower portion (non-skin-facing side portion) of the bottom of the compressed groove 14 is compressed to form a high-density portion 15 having a higher fiber density than the surrounding area.
Since the compressed grooves are formed in the absorbent polymer non-existing region, the surface sheet can be prevented from being broken due to the embedding of the absorbent polymer at the time of compression. Further, since the lower part of the bottom of the compressed groove is formed with a high-density part having a higher fiber density than the surrounding, the body fluid such as urine flowing into the compressed groove can be rapidly moved to the lower side (non-skin-facing side) by the capillary action of the high-density part, and can be positioned on the absorbent sheet SAThe cyclodextrin-containing layer on the lower side (non-skin-facing surface side) of the (absorbing layer) efficiently absorbs body fluid and odors caused by body fluid.
The compressed groove may be formed from the skin-facing surface of the top sheet 2 to the inside of the cyclodextrin-containing layer described below, or to the carrier sheet 5' located on the back sheet side of the cyclodextrin-containing layer. When the compressed groove is formed in this manner, body fluid such as urine discharged by the wearer can move to the cyclodextrin-containing layer more quickly, and gaps and twisting between the layers of the absorbent article are more difficult to occur.
In addition to the compressed grooves, the surface sheet (liquid-permeable layer) may be provided with irregularities by embossing or the like. When such irregularities are provided in the top sheet, the contact area between the skin of the wearer and the discharged body fluid can be reduced, thereby reducing the occurrence of rash and the like.
In the light incontinence pad 1 of the present embodiment, the cyclodextrin-containing layer contains a hot-melt adhesive that bonds at least a part of cyclodextrin in the absorbent layer 4 containing cyclodextrin to the carrier sheet 5' (cyclodextrin-retaining sheet) on the non-skin-facing side of cyclodextrin, and along the longitudinal direction D of the light incontinence pad 1 (absorbent article)LContinuously or intermittently extending, the cyclodextrin-containing layer, however, also having a longitudinal direction D lying in the light incontinence pad 1, viewed in planLAnd the width direction DWAdhesive coating region T ofHAnd cyclodextrin is provided and extends along the length direction DLAnd the width direction DWExtended cyclodextrin disposition regionTC(ii) cyclodextrin-configured region TCLength direction D ofLTwo edges E ofLC、E'LCAnd the width direction DWTwo edges E ofWC、E'WCConfigured to be respectively specific to the adhesive coating regions THLength direction D ofLTwo edges E ofLH、E'LHAnd the width direction DWTwo edges E ofWH、E'WHIn the longitudinal direction DLAnd the width direction DWThe upper part is located at the inner side.
In the present specification, the "adhesive coated region" refers to a region coated with an adhesive when viewed from a plane, specifically, refers to a region along the longitudinal direction D of the absorbent articleLAnd the width direction DWThe extended region is connected in the width direction DWThe outermost adhesive end portion is in the longitudinal direction DLEach along the length direction D L2 virtual longitudinal straight lines and a connection longitudinal direction DLThe outermost adhesive end portion is in the width direction DWEach along the width direction D W2 width direction imaginary straight lines. In fig. 3, 2 longitudinal direction imaginary straight lines and 2 width direction imaginary straight lines are used only for partitioning the adhesive application region THAre respectively indicated as adhesive application regions THIn the width direction D ofWTwo edges E ofWH、E'WHAnd the length direction DLTwo edges E ofLH、E'LH。
From the viewpoint of the contact efficiency of the cyclodextrin with the body fluid discharged from the wearer, as shown in fig. 3, the adhesive-coated region T is viewed from the planeHPreferably in the width direction DWAcross the longitudinal direction D of the absorbent articleLExtended central axis CLAnd in the width direction DWExtension and in the longitudinal direction DLAcross the width direction D of the absorbent articleWExtended central axis CWAnd along the length direction DLAn extended region which is a body fluid absorption region T of the absorbent articleAThe overlapping region, and more preferably entirely including the body fluid absorption region TAThe area of (a).
In the present specification, the term "cyclodextrin disposition region" refers to a region in which cyclodextrin is disposed on the surface of the cyclodextrin-retaining sheet when viewed from the plane, and specifically refers to a region in which cyclodextrin is disposed along the longitudinal direction DLAnd the width direction DWExtended region, which is connected in width direction DWThe end of the most outside cyclodextrin is in the length direction DLEach along the length direction D L2 virtual longitudinal straight lines and a connection longitudinal direction DLThe end of the outermost cyclodextrin in the width direction DWEach along the width direction D W2 width direction imaginary straight lines. In FIG. 3, 2 virtual lines in the length direction and 2 virtual lines in the width direction are used only for dividing the cyclodextrin disposition region TCThe portions (line segments) of (A) are respectively represented as cyclodextrin disposition regions TCIn the width direction D ofWTwo edges E ofWC、E'WCAnd the length direction DLTwo edges E ofLC、E'LC。
From the viewpoint of improving the contact efficiency between the body fluid discharged from the wearer and the cyclodextrin, as shown in fig. 3, the cyclodextrin disposition region T is seen in plan viewCPreferably in the width direction DWAcross the longitudinal direction D of the absorbent articleLExtended central axis CLAnd in the width direction DWExtension and in the longitudinal direction DLAcross the width direction D of the absorbent articleWExtended central axis CWAnd along the length direction DLAn extended region which is a body fluid absorption region T of the absorbent articleAThe overlapping region, and more preferably entirely including the body fluid absorption region TAThe area of (a). If the cyclodextrin configures the region TCIs a body fluid absorption region T completely including the absorbent articleAThe region (2) is such that body fluid such as urine discharged by the wearer is likely to come into contact with the cyclodextrin, and the deodorizing function of the cyclodextrin and the slow-release function of the perfume can be exhibited more reliably.
In the light incontinence pad 1 of the present embodiment, the cyclodextrin contained in the cyclodextrin-containing layer is bound to the layer made of tissue paper or the like by a binderThe carrier sheet 5' (cyclodextrin-retaining sheet) is partially engaged and, viewed in plan, the cyclodextrin-disposed region TCLength direction D ofLTwo edges E ofLC、E'LCAnd the width direction DWTwo edges E ofWC、E'WCHas the following structure: respectively specific adhesive coating region THLength direction D ofLTwo edges E ofLH、E'LHAnd the width direction DWTwo edges E ofWH、E'WHIn the longitudinal direction DLAnd the width direction DWAnd thus, in the portion where the cyclodextrin is held on the carrier 5 'by the adhesive, the cyclodextrin in the absorbent layer 4 containing cyclodextrin is more difficult to move in the in-plane direction of the carrier 5', whereas in the portion where the cyclodextrin is not held on the carrier 5 'by the adhesive, the cyclodextrin in the absorbent layer 4 containing cyclodextrin can move to some extent in the in-plane direction of the carrier 5', but because of being located in the cyclodextrin disposition region TCLength direction D ofLTwo edges E ofLC、E'LCAnd the width direction DWTwo edges E ofWC、E'WCThe adhesive on the outer side is more difficult to move further to the outer side. Thus, the light incontinence pad 1 of this embodiment can maintain the cyclodextrin in the cyclodextrin-containing layer in the adhesive-coated region T defined by the adhesiveHIn addition, the cyclodextrin migration (maldistribution) can be effectively prevented. As a result, the light incontinence pad 1 of the present embodiment can keep body fluid such as urine discharged by the wearer in continuous contact with cyclodextrin, and thus can stably and sufficiently exhibit the deodorizing function (odor component absorbing function) of cyclodextrin and the slow-release function of active ingredients such as perfume and the like.
Further, in the light incontinence pad 1 of the present embodiment, the structure is: cyclodextrin disposition region TCLength direction D ofLTwo edges E ofLC、E'LCAnd the width direction DWTwo edges E ofWC、E'WCRespectively specific adhesive coating region THBoth edges E in the longitudinal direction ofLH、E'LHAnd the width direction DWTwo edges E ofWH、E'WHIn the longitudinal direction DLAnd the width direction DWThe upper part is positioned at the inner side; however, the absorbent article of the present invention is not limited to this structure, and it may have the following structure: cyclodextrin disposition region TCLength direction D ofLTwo edges E ofLC、E'LCOr the width direction DWTwo edges E ofWC、E'WCSpecific adhesive coating region THBoth edges E in the longitudinal direction ofLH、E'LHOr the width direction DWTwo edges E ofWH、E'WHIn the longitudinal direction DLOr the width direction DWThe upper part is located at the inner side. In the absorbent article having such a structure, the cyclodextrin in the cyclodextrin-containing layer can also be retained to some extent in the adhesive-coated region T defined by the adhesiveHThereby, the migration of cyclodextrin can be sufficiently prevented.
As described above, the cyclodextrin-containing layer in the light incontinence pad 1 of the present embodiment has the following structure: an absorbent layer 4 containing cyclodextrin, which contains cyclodextrin and a mixture of an absorbent polymer and a liquid-retentive substance, is sandwiched between carrier sheets 5, 5' composed of two liquid-permeable sheets; however, the absorbent article of the present invention is not limited to this structure. For example, the cyclodextrin-containing layer may have the following composition: the cyclodextrin in any desired form such as granular powder or the like together with the absorbent polymer and/or liquid retentive substance (if necessary) is sandwiched by folding a single liquid-permeable sheet, or is surrounded by 3 or more liquid-permeable sheets, as shown in the second embodiment described below, from the non-skin opposite surface side. Further, when a plurality of liquid-permeable sheets are used as the carrier sheet, the respective liquid-permeable sheets used may be the same kind of liquid-permeable sheet, or different kinds of liquid-permeable sheets may be used.
The liquid-permeable sheet used for the carrier sheet of the present invention may be any desired sheet-like fibrous structure, for example, a nonwoven fabric (including tissue paper), a woven fabric, or the like, composed of an aggregate of fine fibers such as pulp. The basis weight of the fibrous structure is not particularly limited; however, from the viewpoint of liquid permeability and prevention of the outflow of cyclodextrin, for example, 1 to 50g/m2Preferably 5～30g/m2Or even more preferably 10 to 20g/m2。
The fibrous structure preferably has an interfiber distance to the extent that the cyclodextrin does not pass between the constituent fibers of the fibrous structure but flows out from the cyclodextrin-containing layer (for example, a distance smaller than the particle diameter of the granular powder of cyclodextrin) while allowing the body fluid discharged by the wearer to pass therethrough. Examples of the fiber structure include a fiber structure having an inter-fiber distance of 1 to 300 μm in at least 90% of the whole, and preferably a fiber structure having an inter-fiber distance of 10 to 150 μm in at least 90% of the whole.
The distance between fibers of the fiber structure can be measured based on the mercury intrusion method (JIS R1655) using a mercury porosimeter (product of Shimadzu corp.). The mercury intrusion method provides information on the structure of a fiber structure by measuring the pressure applied to mercury by injecting mercury between constituent fibers of the fiber structure to be measured using mercury and the volume of mercury pressed into the spaces between the constituent fibers of the fiber structure.
Specifically, the inter-fiber distance of the fibrous structure can be measured by the following procedure using a mercury porosimeter.
1) The fiber structure to be measured was cut into a size of 24mm × 15mm, and a measurement sample was prepared. 3 measurement samples were made.
2) 3 measurement samples were placed in a sample cell of a mercury porosimeter (product of Shimadzu corp.) in a non-overlapping manner, and then the pressure applied to mercury was gradually changed while measuring the volume (i.e., pore volume) of mercury pressed into spaces (i.e., pores) between constituent fibers of a fiber structure. The measurement was carried out in an atmosphere of 22 ℃ and 65% RH.
3) The diameter D (μm) of the pores (i.e., the inter-fiber distance (μm) of the fiber structure) was calculated by the following formula (1), and the relationship between the diameter D and the pore volume was obtained as a distribution curve (integral curve) of the diameter D. The measurement conditions of the following formula (1) are that the mercury surface tension is 0.483N/m, the contact angle is 130 DEG, and the mercury pressure is 0 to 414MPa (absolute pressure).
[ mathematical formula 1]
D＝-4γcosθ/P…(1)
(in the formula, D represents a diameter (distance between fibers), γ represents a surface tension of mercury, θ represents a contact angle, and P represents a pressure.
4) Based on the obtained distribution curve of the diameter D, the ratio of the volume of the pores having the diameter D of 1 to 300 μm (or 10 to 150 μm) to the total volume of the pores having the diameter D of 0 to 500 μm is calculated.
5) Repeating the operations 2) to 4) 3 times, and taking the average value of the obtained volume ratios as the percentage (%) of the distance between fibers of 1 to 300 μm (or 10 to 150 μm) to the whole.
In the cyclodextrin-containing layer of the light incontinence pad 1 of the present embodiment, the cyclodextrin in the absorbent layer 4 containing cyclodextrin is partially bound to the carrier sheet 5' made of thin paper or the like disposed on the non-skin-facing surface side of cyclodextrin by an adhesive; however, the manner of bonding the cyclodextrin and the carrier sheet (liquid-permeable sheet) in the absorbent article of the present invention is not limited to this manner, and for example, the cyclodextrin may be bonded to the liquid-permeable sheet disposed on the skin-facing surface side of the cyclodextrin, or the cyclodextrin may be bonded to the liquid-permeable sheet disposed on both the skin-facing surface side and the non-skin-facing surface side of the cyclodextrin.
Herein, "cyclodextrin" is a cyclic oligosaccharide of glucopyranose units linked by α -1,4 linkages, and is generally referred to as α -cyclodextrin when the number of glucopyranose units per molecule of cyclodextrin is 6, β -cyclodextrin when 7, and γ -cyclodextrin when 8. Due to the presence of moisture and the like, cyclodextrin can include other molecules (for example, active ingredients such as perfumes and deodorizing ingredients, or odor components in excrement) within a cyclic structure, while releasing the included other molecules by external action such as environmental change and the like. The cyclodextrin used in the absorbent article of the present invention is not particularly limited, and may be α -, β -, γ -cyclodextrin and/or a mixture thereof, or chemically modified (e.g., methylated or acetylated) α -, β -, γ -cyclodextrin and/or a mixture thereof. With respect to the absorbent article of the present invention, "cyclodextrin" includes not only cyclodextrin which is not included, but also cyclodextrin which retains various active ingredients such as perfume and the like.
The cyclodextrin in the absorbent article of the present invention is preferably a cyclodextrin that retains a desired fragrance such as a natural fragrance or a synthetic fragrance. The cyclodextrin which retains such perfume has a function of gradually releasing the perfume retained in the cyclodextrin when it comes into contact with a body fluid such as urine discharged from a wearer, and therefore, the released perfume can mask the odor of the body fluid, and the cyclodextrin which is not included after the perfume is released can absorb odor components such as ammonia components and the like in the body fluid. Therefore, the use of cyclodextrin which retains such a perfume can effectively suppress odor generated by body fluid such as urine discharged by the wearer.
The perfume retained in the cyclodextrin is not particularly limited, and any perfume known in the art such as natural perfume or synthetic perfume, etc. may be used; however, in view of the use of the absorbent article for the human body, it is preferable to use natural perfumes derived from plants. The flavor retained in the cyclodextrin is preferably the same as the liquid flavor described above. When the perfumes are of the same composition, body fluid such as urine discharged by the wearer will come into contact with the cyclodextrin holding the perfume, and even if the perfume is released from the cyclodextrin, the perfume will not be changed by the mixture of different perfumes generated by the perfume, and unpleasant perfume due to the mixture of a plurality of perfumes will not be generated. Further, when the wearer discharges body fluid such as urine, the fragrance released from cyclodextrin generates fragrance in addition to the fragrance from the liquid fragrance, and therefore, the fragrance emitted from the absorbent article is increased, and odor at the time of discharge of body fluid can be more effectively masked.
Further, when the non-included cyclodextrin (cyclodextrin which does not retain a perfume) and the perfume-retaining cyclodextrin are used in combination in the absorbent article of the present invention, at least a certain amount of the non-included cyclodextrin can be secured in the absorbent article in addition to the effect of the perfume-retaining cyclodextrin, and therefore, the absorbing effect of the non-included cyclodextrin on odor components can be more reliably exhibited, and the deodorizing effect of the absorbent article can be further improved. The non-included cyclodextrin is preferably used in a proportion of 5 to 50 mass% with respect to the total amount of cyclodextrin used. In addition, "cyclodextrin molecules that retain a fragrance" includes clathrate complexes that include fragrance within the ring structure of the cyclodextrin molecule, as well as associations of cyclodextrin molecules and fragrance through various intermolecular forces or interactions.
The form of cyclodextrin used in the absorbent article of the present invention is not particularly limited, and various forms thereof may be used; however, from the viewpoints of dispersibility and ease of handling at the time of manufacture, and improvement of contact efficiency with body fluid such as urine discharged by a wearer, cyclodextrin particle powder whose particle size is adjusted using a binder such as maltose cyclodextrin (maltodextrine), pullulan, or gum arabic is preferable. The particle diameter of the cyclodextrin particle powder is not particularly limited, and for example, may be about 5 μm to 300 μm, preferably 10 μm to 100 μm; however, it is most preferable to have a particle diameter larger than the distance between fibers of the fibrous structure constituting the carrier sheet (liquid-permeable sheet) adjacent to the cyclodextrin. When the particle diameter of the cyclodextrin particle powder is larger than the distance between fibers of the fibrous structure constituting the carrier sheet, this can prevent the cyclodextrin particle powder from flowing out of the cyclodextrin containing layer through the constituting fibers of the fibrous structure, so that the deodorizing function of cyclodextrin and the slow-release function of an active ingredient such as perfume can be stably and sufficiently exhibited.
Further, the particle diameter of the cyclodextrin particle powder can be measured by a dry laser diffraction scattering method using a laser diffraction/scattering particle size distribution analyzer (e.g., MT3300EXII Microtrac manufactured by Nikkiso co., ltd.). The dry laser diffraction scattering method is a method as follows: the powder sample was dispersed in air while being irradiated with laser light, and the volume-based particle size distribution was measured from the diffraction scattering pattern, and for the purpose of the present invention, the median diameter (D50) obtained from the particle size distribution was used as the particle size of the particle powder. Specific measurement conditions of the dry laser diffraction scattering method are as follows.
Measuring frequency: 1 time of
Measuring time: 10 seconds
Dispersing pressure: 100kPa
Permeability of particles: through the use of
Refractive index of the particles: 1.81
Particle shape: non-spherical shape
Solvent: air (a)
Solvent refractive index: 1.00
Measurement range: 0.243 to 2000 μm
Further, the cyclodextrin particle powder may include a small amount (e.g., 10 mass% or less) of cyclodextrin and/or a binder holding any active ingredient such as a deodorizing ingredient, or any functional ingredient such as an absorbent ingredient (e.g., pulp or absorbent polymer) and an adsorptive ingredient (e.g., zeolite, silica gel, or activated carbon), in addition to cyclodextrin which is not included and cyclodextrin which holds a perfume. Examples of such active ingredients include deodorant ingredients and antibacterial ingredients known in the art, and mixtures thereof. Cyclodextrins that retain such active ingredients also include clathrate complexes that include the active ingredient within the ring structure of the cyclodextrin molecule, and associations of cyclodextrin molecules and active ingredients through various intermolecular forces or interactions.
The cyclodextrin (i.e., cyclodextrin complex) that retains an active ingredient has a function of gradually releasing the active ingredient retained in the cyclodextrin by contact with moisture in body fluid such as urine discharged by a wearer, thereby exhibiting the effect of the active ingredient. Such cyclodextrin complexes can be readily obtained by, for example, adding a fragrance or active ingredient to a solution containing the non-included cyclodextrin, stirring and mixing. The presence or absence of the cyclodextrin inclusion compound can be confirmed by elemental analysis using X-rays or the like.
In the light incontinence pad 1 of this embodiment, the cyclodextrin-containing layer has the following structure: the absorbent layer 4 containing cyclodextrin comprising the above cyclodextrin and a mixture of an absorbent polymer and a liquid-retentive substance (e.g., pulp) is sandwiched between carrier sheets 5, 5 'composed of two liquid-permeable sheets (e.g., thin paper) on the skin-facing surface side and the non-skin-facing surface side of the absorbent layer 4 containing cyclodextrin, and at least a part of the cyclodextrin in the absorbent layer 4 containing cyclodextrin is held by a hot-melt adhesive on the surface on the skin-facing surface side of the carrier sheet 5' (cyclodextrin-retaining sheet) on the non-skin-facing surface side of the absorbent layer 4 containing cyclodextrin. If the cyclodextrin-containing layer is constituted in this manner, when the body fluid such as urine discharged by the wearer reaches the cyclodextrin-containing layer, the body fluid moves to the portion of the lower side (non-skin-facing surface side) of the absorbent layer 4 containing cyclodextrin by the action of gravity and is deposited at the portion, and therefore, the body fluid deposited in the portion can be brought into a state of being easily brought into contact with the cyclodextrin held on the surface of the skin-facing surface side of the carrier sheet 5', whereby the deodorizing function of cyclodextrin and the slow-release function of the active ingredient such as perfume can be exhibited more efficiently and effectively.
The cyclodextrin-containing layer can be obtained by: an absorbent layer 4 containing cyclodextrin comprising cyclodextrin and a mixture of an absorbent polymer and a liquid retentive substance is joined to two carrier sheets 5, 5' using a hot melt adhesive. Specifically, the cyclodextrin-containing layer can be obtained by performing the following steps: an adhesive application step of disposing a carrier sheet 5 '(cyclodextrin-retaining sheet) made of thin paper or the like so that the side opposite to the skin of the wearer faces upward, and while the carrier sheet 5' is in a stationary state or being conveyed, the adhesive sheet is disposed along the longitudinal direction D corresponding to the light incontinence pad 1LIn the direction of (1), applying the adhesive to the surface of the skin-facing side of the slide 5'; a cyclodextrin preparing step of preparing cyclodextrin in the adhesive coating region T coated with the adhesiveHAt least on the surface of the adhesive; an absorbent layer containing cyclodextrin is formed by disposing a mixture of an absorbent polymer and a liquid retentive material (e.g., pulp) on the adhesive-coated region T of the carrier sheet 5HTo form a cyclodextrin-containing absorbent layer 4; and a carrier sheet disposing step of disposing a carrier sheet 5 on the surface of the skin-facing side of the absorbent layer 4 containing cyclodextrin with or without using an adhesive.
In the cyclodextrin disposing step, the method of disposing cyclodextrin on the surface of the adhesive that has been coated on the carrier sheet is not particularly limited, and may be a disposition in the form of the above-mentioned granular powder, a disposition in the form of dispersion in a dispersion medium (for example, silicone oil, mineral oil, etc.), or a disposition in the form of a solution dissolved in a solvent (for example, a glycol such as propylene glycol, dipropylene glycol, or 1, 3-butanediol, or an ester-based organic solvent such as triethyl citrate or diethyl phthalate).
In addition, in the cyclodextrin disposing step, the disposing means of cyclodextrin is not particularly limited, and for example, coating may be performed in any desired manner such as spraying, coating in a plurality of stripes, coating in an Ω -like shape, or the like, using a non-contact system or a contact coater. Viewed in plan, the cyclodextrin can be in the cyclodextrin disposition region TCCoated without gaps, or can be disposed in the cyclodextrin-containing region TCThe coating is carried out in such a manner that a plurality of regions free from cyclodextrin (i.e., cyclodextrin-absent regions) are formed. Most preferably, the region T is configured with cyclodextrinCBody fluid absorption region T including absorbent articleAThe coating is performed so that a plurality of cyclodextrin non-existing regions are formed in the overlapping region. When such cyclodextrin-absent regions are formed, these regions function as channels for body fluid such as urine discharged by the wearer, and therefore, the body fluid is not blocked by the absorbent layer containing cyclodextrin, and can be in the thickness direction D of the absorbent articleTAnd (4) upward infiltration. As a result, the absorbent article of the present invention can exhibit excellent absorption performance and deodorizing function.
The amount of cyclodextrin to be applied to the absorbent article of the present invention is not particularly limited, and may be suitably determined in accordance with the desired deodorizing ability and absorbing ability, and is, for example, 20mg to 100mg per absorbent article. Further, from the viewpoint of increasing the chance of contact between the body fluid such as urine discharged by the wearer and the cyclodextrin, as shown in fig. 3, the cyclodextrin is preferably disposed in the body fluid absorption region T entirely including the absorbent article as viewed in planAIn the region of (a).
For the present embodiment, the absorbent layer 4 containing cyclodextrin in the cyclodextrin-containing layer contains cyclodextrin and a mixture of an absorbent polymer and a liquid-retentive substance, and functions as an absorbent layer. Also, with the present embodiment, the absorber layer containing cyclodextrin is not particularly limited as long as it is a layer containing cyclodextrin and having absorbability; however, the absorbent layer containing cyclodextrin preferably contains cyclodextrin, and a mixture of an absorbent polymer and pulp. When this embodiment is used as an absorbent layer containing cyclodextrin, the pulp aggregate in the absorbent layer containing cyclodextrin acts so that the body fluid reaching the absorbent layer containing cyclodextrin is diffused through capillary motion over a wide range of the absorbent layer containing cyclodextrin, whereby the body fluid is absorbed and retained over a wide range of the absorbent layer containing cyclodextrin, and excellent absorption performance is obtained for the absorbent article, and further, since the body fluid can be absorbed and retained in the absorbent layer containing cyclodextrin, the body fluid retained in the absorbent layer containing cyclodextrin can be reliably brought into contact with cyclodextrin in the absorbent layer containing cyclodextrin for a long period of time even if the amount of body fluid such as urine or the like discharged by the wearer is large.
The contents of the absorbent polymer and the liquid retentive substance in the absorbent layer containing cyclodextrin are not particularly limited, but are preferably 60 parts by mass or less and 40 parts by mass or more, respectively, based on 100 parts by mass of the total. If the content of the absorbent polymer in the absorbent layer containing cyclodextrin is 60 parts by mass or less, the body fluid which is not absorbed by the absorbent polymer is easily present, and therefore the amount of the body fluid which can be brought into contact with cyclodextrin and the contact time will be increased, whereas if the content of the liquid retentive substance is 40 parts by mass or more, the body fluid is more easily diffused to a wider range by capillary movement of the liquid retentive substance, and therefore, the body fluid and cyclodextrin can be brought into contact in a wider range of regions.
In the light incontinence pad 1 of the present embodiment, the absorbent layer 4 containing cyclodextrin has at least a part of cyclodextrin in the absorbent layer 4 containing cyclodextrin bonded to the carrier sheet 5' (cyclodextrin-retaining sheet) by a hot melt adhesive; however, the adhesive used to join the cyclodextrin and the cyclodextrin retaining sheet in the absorbent article of the present invention is not particularly limited, and may be any desired adhesive known in the art.
In addition, the adhesive in the light incontinence pad 1 of the present embodiment is applied in the length direction D between the carrier sheet 5' (cyclodextrin retaining sheet) and the absorbent layer 4 containing cyclodextrinLUpper extension and in width direction DWArranged in a plurality of rows. When the adhesive is disposed in this manner, the adhesive-coated region is observed from the planeTHIn which regions where no adhesive exists (i.e., adhesive-absent regions) are locally formed, and these regions function as channels for body fluid such as urine discharged by the wearer, and therefore, the body fluid can pass through the thickness direction DTOn the non-skin-facing surface side of the cyclodextrin retaining sheet in the longitudinal direction DLAnd when a body fluid permeates from the skin-facing surface side to the non-skin-facing surface side of the cyclodextrin retaining sheet, the body fluid diffused in the in-plane direction of the cyclodextrin retaining sheet contacts the cyclodextrin at a wide range of positions by diffusing in the in-plane direction of the cyclodextrin retaining sheet and permeating at the same time. As a result, the absorbent article of the present invention has satisfactory absorption performance as an absorbent article, while more efficiently and effectively exhibiting the deodorizing function possessed by cyclodextrin and the slow-release function of perfume.
In the light incontinence pad 1 of the present embodiment, the application form of the adhesive is not particularly limited, and for example, may be a linear solid line or dotted line form such as a linear or wavy line, a spiral, a zigzag, or an Ω form, when viewed in a plane; in a dotted manner; or any desired pattern such as a geometric pattern such as a grid pattern. Further, the adhesive for joining the cyclodextrin and the cyclodextrin retaining sheet may be applied as an adhesive in the adhesive application region T as viewed in planHThe cyclodextrin-retaining sheet is coated in a planar form (i.e., a mat coating) without any gaps therebetween. If the binder is applied in such a form of full-face application, the binder will penetrate between the constituent fibers of the fibrous structure constituting the cyclodextrin-retaining sheet and fill in the gaps of the fibrous structure, thereby making it difficult for the cyclodextrin retained in the cyclodextrin-retaining sheet to flow out of the cyclodextrin-containing layer through the liquid-permeable sheet, while also increasing the strength of the liquid-permeable sheet to minimize breakage upon wearing, helping to prevent shrinkage due to heat. As a result, the absorbent article of the present invention can stably maintain the structure of the cyclodextrin-containing layer, and therefore, the deodorizing function and the fragrance-releasing function of cyclodextrin in the cyclodextrin-containing layer can be more stably and reliably exhibited. In addition, in the second embodiment described belowIn the case of an absorbent article having a structure in which cyclodextrin is bonded to a sheet located on the skin-facing surface side of cyclodextrin, it is not desirable to apply the adhesive to the cyclodextrin-retaining sheet over the entire surface thereof, because the liquid permeability of the cyclodextrin-retaining sheet will be blocked by the adhesive.
In the absorbent article of the present invention, the amount of the adhesive to be applied is not particularly limited, and may be appropriately determined depending on the desired adhesive strength, liquid permeability and deodorizing performance, and may be, for example, 1 to 40g/m2Preferably 2 to 20g/m2And even more preferably 4 to 10g/m2。
A second embodiment of the present invention will now be described in detail with reference to the accompanying drawings. Fig. 1 is a plan view of a light incontinence pad according to a first embodiment of the invention, and is also a plan view of a light incontinence pad according to a second embodiment of the invention. In addition, fig. 4 is a cross-sectional end view of a mild incontinence pad according to a second embodiment of the present invention, taken along line II-II' in fig. 1. The light incontinence pad 1 of the second embodiment has the same construction as the above-described embodiment, except that: the cyclodextrin-containing layer (cyclodextrin-containing absorbent layer 4 in the first embodiment) is a cyclodextrin layer 4 'composed only of cyclodextrin, at least a part of cyclodextrin is held on the surface (holding surface) of the liquid-permeable sheet 7' located between the topsheet 2 and the cyclodextrin layer 4 'on the non-skin-facing side, the liquid-permeable sheet 7' holds an absorbent material such as an absorbent polymer 6 on the surface on the side opposite to the holding surface, and forms an absorbent sheet S together with the liquid-permeable sheet 7 located on the skin-facing side of the absorbent materialA(absorption layer), the cyclodextrin covering sheet 10 composed of a liquid-permeable sheet such as a tissue is covered with the cyclodextrin from the non-skin-facing surface side (that is, the cyclodextrin-containing layer includes the cyclodextrin layer 4' and the cyclodextrin covering sheet 10).
Since the cyclodextrin-containing layer in the light incontinence pad 1 of the present embodiment is composed of only cyclodextrin, this can increase the chance that body fluid such as urine discharged by the wearer comes into contact with cyclodextrin, while the thickness of the cyclodextrin-containing layer can be reduced, and a desired product design of a thin thickness suitable for different absorption amounts can be realized.
Further, in the light incontinence pad 1 of the present embodiment, at least a part of the cyclodextrin is held on the holding surface on the non-skin-facing surface side of the liquid-permeable sheet 7' positioned between the topsheet and the cyclodextrin layer 4', the liquid-permeable sheet 7' holds an absorbent material such as an absorbent polymer 6 on the surface on the side opposite to the holding surface, and forms an absorbent sheet S together with the liquid-permeable sheet 7 positioned on the skin-facing surface side of the absorbent materialA(absorbing layer). If the light incontinence pad 1 is constructed in this manner, when body fluid such as urine discharged by the wearer reaches the absorbent sheet SAIn time, the body fluid moves to the absorbent sheet S by the action of gravityAThe lower side (non-skin-facing surface side) of the absorbent sheet S, and the body fluid accumulated in the portion gradually permeates into the liquid-permeable sheet 7' and is accumulated in the portionAIs diffused in the in-plane direction of the liquid-permeable sheet 7 'so that the body fluid comes into contact with the cyclodextrin held on the non-skin-facing surface side of the liquid-permeable sheet 7' in a wide range of areas. As a result, the deodorizing function of cyclodextrin and the slow-release function of an active ingredient such as perfume can be exhibited more efficiently and effectively.
Further, in the light incontinence pad 1 of the second embodiment, the absorbent sheet SACan be manufactured in the same manner as the absorbent sheet of the light incontinence pad 1 of the first embodiment described above. In addition, according to the second embodiment, the hot melt adhesive can be applied along the length direction D corresponding to the light incontinence pad 1LIs coated on the absorbent sheet SAOn the surface on the skin-facing surface side (i.e., on the holding surface of the liquid-permeable sheet 7' forming the non-skin-facing surface side of the absorbent sheet), and then the cyclodextrin is disposed in the adhesive application region T on which the adhesive has been appliedHThereby forming a cyclodextrin layer 4', and the cyclodextrin layer 4' can be further covered with a cyclodextrin covering sheet 10 composed of a liquid-permeable sheet, thereby obtaining an absorbent sheet SAA cyclodextrin-containing layer that is combined and comprises an absorbent layer 4 containing cyclodextrin and a cyclodextrin cover sheet 10.
Further, since the light incontinence pad 1 of the present embodiment has the cyclodextrin held in the liquid-permeable sheet 7 'covered from the non-skin-facing surface side by the cyclodextrin covering sheet 10 composed of a liquid-permeable sheet such as a thin paper, the cyclodextrin can be continuously held on the holding surface of the liquid-permeable sheet 7', and the deodorizing function possessed by the cyclodextrin and the slow-release function of the active ingredient such as perfume can be stably exhibited.
For the cyclodextrin covering sheet 10 of this embodiment, it is preferred to use a fibrous structure of the same material as the carrier sheet of the light incontinence pad 1 of the first embodiment described above, such as tissue paper. When this fibrous structure is used as the cyclodextrin covering sheet 10, the body fluid that reaches the cyclodextrin covering sheet 10 can diffuse in the in-plane direction of the cyclodextrin covering sheet 10, and therefore, the body fluid can come into contact with the cyclodextrin located on the skin-facing surface side of the cyclodextrin covering sheet 10 in a wide range of areas. When the above-described fibrous structure is used as the cyclodextrin covering sheet 10, the fibrous structure preferably has an interfiber distance (for example, smaller than the particle diameter of cyclodextrin particle powder) of such a size that the cyclodextrin does not pass through the constituent fibers of the fibrous structure.
The present invention is applicable not only to the light incontinence pad according to the different embodiments described above, but also to various types of absorbent articles such as panty liners, sanitary napkins, disposable diapers, and the like. The absorbent article of the present invention is not limited to the above-described embodiments, and can be appropriately combined and modified within a range not departing from the object and the gist of the present invention. Furthermore, the ordinal numbers "first" and "second" used in this specification are used only to distinguish between numbered embodiments and are not used to indicate any relative ordering, priority or importance.
Description of the reference numerals
1 light incontinence pad (absorbent article)
2 surface sheet (liquid permeable layer)
3 Back sheet (impermeable layer)
Absorbent layer containing cyclodextrin
4' Cyclodextrin layer
5 carrying sheet
5' slide glass
6 absorbent Polymer (absorbent Material)
7 liquid-permeable sheet on skin-facing surface side
Liquid-permeable sheet on 7' non-skin-facing surface side
8,8' side gather sheet
9,9' thread-like elastic member
10 Cyclodextrin cover sheet
11 absorbent polymer disposition region
12 non-disposed region of absorbent polymer
13 absorbent Polymer non-Presence region
14 compression groove
15 high density portion
G adhesive
TABody fluid absorption area
TCCyclodextrin disposition region
THAdhesive coated area
TF,T'FFragrance distribution area

Claims (8)

1. An absorbent article comprising a liquid-permeable layer, a liquid-impermeable layer, an absorbent layer disposed between the two layers, and a cyclodextrin-containing layer disposed between the absorbent layer and the liquid-impermeable layer,
the absorbent layer has a longitudinal direction, a width direction, and a thickness direction, and includes an absorbent polymer, a liquid-pervious sheet that holds the absorbent polymer, an adhesive that fixes the absorbent polymer to the liquid-pervious sheet, and a fragrance that is present in an end region of the absorbent layer in the width direction,
the absorption layer is formed by: has the absorbent polymer sandwiched by the liquid-permeable sheet in the thickness direction, has an absorbent polymer disposition region located in a central region in the width direction, and an absorbent polymer non-disposition region adjacent to the absorbent polymer disposition region in the width direction, and the liquid-permeable sheet is folded toward the inside in the width direction at the absorbent polymer non-disposition region by a fold line extending in the length direction, and the perfume is present in a region sandwiched by the liquid-permeable sheet in the thickness direction between the fold line and an end portion in the width direction of the liquid-permeable sheet, and
the adhesive is intermittently applied to the liquid-permeable sheet, and is applied to the liquid-permeable sheet such that an application position on the skin-facing surface side of the absorbent polymer on the liquid-permeable sheet and an application position on the non-skin-facing surface side of the absorbent polymer on the liquid-permeable sheet do not overlap each other in the thickness direction.
2. The absorbent article of claim 1, wherein the absorbent layer does not contain pulp fibers.
3. The absorbent article according to claim 1 or 2, wherein the absorbent layer has an absorbent polymer absent region where the absorbent polymer is locally absent in the absorbent polymer-disposed region as viewed in plane, and the absorbent article has a compressed groove extending from the skin-facing surface of the liquid-permeable layer to at least the inside of the absorbent layer, the compressed groove being formed in the absorbent polymer absent region as viewed in plane.
4. The absorbent article of claim 1 or 2, wherein the cyclodextrin containing layer comprises a cyclodextrin complex comprising a perfume-retaining cyclodextrin, and a perfume-not-retaining cyclodextrin.
5. The absorbent article according to claim 1 or 2, wherein the cyclodextrin-containing layer includes cyclodextrin particle powder including at least one of cyclodextrin and a cyclodextrin complex, and an absorbent material.
6. The absorbent article according to claim 5, wherein the absorbent material is a mixture of an absorbent polymer and a liquid retentive substance, and contains 60 parts by mass or less of the absorbent polymer and 40 parts by mass or more of the liquid retentive substance, based on 100 parts by mass of the total thereof.
7. The absorbent article of claim 5, wherein the cyclodextrin-containing layer further comprises the cyclodextrin particle powder; and a cyclodextrin retaining sheet located between the absorbent material and the liquid-impermeable layer and retaining at least a portion of the cyclodextrin particulate powder.
8. The absorbent article according to claim 1 or 2, wherein the cyclodextrin-containing layer comprises: a cyclodextrin particulate powder comprising at least one of a cyclodextrin and a cyclodextrin complex; and a cyclodextrin covering sheet which is located between the cyclodextrin granular powder and the liquid-impermeable layer and covers the cyclodextrin granular powder, at least a part of the cyclodextrin granular powder being fixed in the absorbent layer.
CN201580055082.2A 2014-10-10 2015-02-12 Absorbent article Active CN106794084B (en)

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AU2015249159B1 (en) 2015-12-24
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TW201628579A (en) 2016-08-16
JP2016077857A (en) 2016-05-16
WO2016056257A1 (en) 2016-04-14
TWI701022B (en) 2020-08-11
JP5769896B1 (en) 2015-08-26

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