WO2022054832A1 - Underpants-type absorbent article - Google Patents

Abstract

An underpants-type absorbent article (1) according to the present invention includes a composite elastic part (10E) in the natural state thereof, wherein: inner layer sheets (12) have a gather structure comprising a plurality of recessed strip parts (120) that include bonding parts (13) at a bottom section and that extend in the vertical direction (x), and protruding strip parts (121) positioned between the recessed strip parts (120) and having, as the top part thereof, curved sections (12P) of the inner layer sheets (12); and outer layer sheets (11) have a plurality of curved sections (11P) in a region that overlaps a single protruding strip part (121) of the inner layer sheets (12) in a planar view. At least one of a ventral section (A) and a dorsal section (B) is provided with an exterior folded-back part (14) that includes a portion where the composite elastic part (10E) is folded back with the inner layer sheets (12) inside.

Description

Pants type absorbent article

The present invention relates to pants-type absorbent articles such as pants-type disposable diapers.

A pants-type disposable diaper, which is a kind of pants-type absorbent article, typically includes an absorbent body including an absorbent body and an exterior body arranged on the non-skin facing surface side of the absorbent body, and is a predecessor. It has a structure in which both side edges along the vertical direction of the body and the back body are joined to form a pair of side joints, a waist opening, and a pair of leg openings. In a pants-type disposable diaper having such a configuration, in order to improve the fit to the wearer's body, a plurality of elastics fixed laterally extensiblely to the exterior body between the waist opening and the leg opening. The members are intermittently arranged in the vertical direction. The vertical direction is a direction corresponding to the front-back direction of the wearer, and the horizontal direction is a direction orthogonal to the vertical direction.

Patent Document 1 describes, as an exterior body of a pants-type disposable diaper, an outer layer sheet located on the outer surface side of the diaper, an inner layer sheet located on the inner surface side of the diaper, and a plurality of elastic members arranged between the two sheets. It is described that the one in which the gathers are formed by the composite elastic portion is used. In the composite elastic portion, the outer layer sheet and the inner layer sheet are joined at a large number of joints dispersed in both the expansion / contraction direction (horizontal direction of the diaper) and the orthogonal direction (vertical direction of the diaper) of the composite elastic portion. The elastic members are arranged so as not to pass through the joint portion, and both ends of the elastic member in the longitudinal direction are fixed between the two sheets, and both sheets extend continuously over a plurality of the elastic members. The folds of the book are formed, and the size of the folds differs between the outer layer sheet and the inner layer sheet. According to the pants-type disposable diaper described in Patent Document 1, it is said that the composite elastic portion is excellent in breathability and softness, and has different cushioning properties on the front and back of the exterior body.

Patent Document 2 describes that as an exterior body of a pants-type disposable diaper, a diaper having an elastic composite portion including an elastic sheet and a non-expandable sheet joined at a surface facing the elastic sheet is used. .. In the stretchable composite portion in a natural state, a large number of first ridges are formed on the surface on the non-stretchable sheet side, and the height is lower than the first ridges on the surface on the stretchable sheet side. A large number of the two ridges are formed, and the first ridges are arranged so as to be able to come into contact with the wearer's skin. According to the pants-type disposable diaper described in Patent Document 2, the surface side in contact with the wearer's skin is cushioned by the ridges, and the ridges having a lower height are arranged on the outer surface. Therefore, it is said that the fluffy appearance is reduced and an underwear-like appearance and feel can be realized.

In Patent Document 3, the exterior body in the vicinity of the waist opening of the pants-type disposable diaper naturally has a plurality of folds spaced apart from each other on the inner layer sheet surface and the outer layer sheet surface in the circumferential direction of the waist opening. It is described that the pitch between the folds on the surface of the inner layer sheet is smaller than the pitch between the folds on the surface of the outer layer sheet. According to the pants-type disposable diaper described in Patent Document 2, good cushioning is obtained by the folds of the inner layer sheet on the surface side in contact with the wearer's skin, and the outer surface side of the diaper has a relatively large pitch of the outer layer sheet. It is said that the folds of the diapers reduce the fluffy appearance and can realize an underwear-like appearance.

Japanese Unexamined Patent Publication No. 2009-297096 Japanese Unexamined Patent Publication No. 2010-284228 Japanese Unexamined Patent Publication No. 2010-284229

The present invention has a vertical direction extending from the ventral side of the wearer to the dorsal side through the crotch portion and a lateral direction orthogonal to the vertical direction, and the inseam arranged in the crotch portion of the wearer and the inseam. It is divided into a ventral part arranged on the ventral side of the wearer rather than the portion and a dorsal part arranged on the dorsal side of the wearer rather than the inseam. Equipped with an exterior body arranged on the non-skin facing side of the sex body,
The present invention relates to a pants-type absorbent article in which a waist opening and a pair of leg openings are formed by joining both side edges of the exterior body of the ventral portion and the dorsal portion along the vertical direction. ..
In one embodiment of the pants-type absorbent article of the present invention, the exterior body has an outer layer sheet arranged at a position relatively far from the absorber and an inner layer arranged at a position relatively close to the absorber. It is preferable to include a sheet.
In one embodiment of the pants-type absorbent article of the present invention, at least a part of the exterior body is a composite stretchable portion having elasticity in the lateral direction, and in the composite stretchable portion, the outer layer sheet and the inner layer are used. It is preferable that the sheet is joined by a plurality of joint portions intermittently arranged in the lateral direction.
In one embodiment of the pants-type absorbent article of the present invention, in the composite stretchable portion in a natural state, the inner layer sheet has a plurality of concave portions having the joint portion at the bottom and extending in the vertical direction, and the concave portion. It has a fold structure consisting of a ridge portion located between the strips and having a ridge portion having a bent portion of the inner layer sheet as a top, and the outer layer sheet overlaps with one of the ridge portions of the inner layer sheet in a plan view. It is preferable to have a plurality of bent portions in the region.
In one embodiment of the pants-type absorbent article of the present invention, an exterior body folded portion including a portion in which the composite elastic portion is folded back with the inner layer sheet inside at least one of the ventral side portion and the dorsal side portion. Is preferably provided.
Other features, effects and embodiments of the invention are described below.

FIG. 1 is a perspective view schematically showing a pants-type disposable diaper, which is an embodiment of the pants-type absorbent article of the present invention. FIG. 2 is a development plan view schematically showing the diaper shown in FIG. 1 in the unfolded and stretched state with the skin facing surface (inner surface) side partially broken. FIG. 3 is an exploded perspective view schematically showing the diaper shown in FIG. 1 in an exploded manner. FIG. 4 is a cross-sectional view schematically showing the cross section taken along the line II of FIG. FIG. 5 is a vertical sectional view schematically showing a sectional view taken along line II-II of FIG. FIG. 6 is a partially broken perspective view schematically showing an example of an elastic sheet that can be used as the outer layer sheet of the diaper shown in FIG. 1. FIG. 7 is a cross-sectional view schematically showing a cross section taken along line III-III of FIG. 5, and is a cross-sectional view of the folded portion of the exterior body of the diaper shown in FIG. 1 in a natural state. FIG. 8 is a schematic perspective view of the folded portion of the exterior body in the natural state shown in FIG. 7. FIG. 9 is a schematic cross-sectional view of the composite telescopic portion constituting the folded portion of the exterior body shown in FIG. 7. FIG. 10 is a view corresponding to FIG. 7 of another embodiment of the folded portion of the exterior body according to the present invention.

Detailed description of the invention

One of the main wearers of pants-type disposable diapers is young infants. In general, young infants spend a relatively long time in a sleeping position while wearing a diaper, and during that time, the waist area of the diaper's exterior body strongly presses the wearer's skin, so that the pressure marks are attached to the skin. It is easy and there is a concern about the burden on the skin. In addition, when an infant wearing a diaper is in a sleeping posture for a long time, the air permeability of the portion of the diaper that strongly presses the wearer's skin is reduced, and there is a concern that inconvenience such as stuffiness may occur. The conventional pants-type absorbent article has room for improvement in terms of cushioning property and breathability of the exterior body.

Therefore, the present invention relates to a pants-type absorbent article having an exterior body having excellent cushioning and breathability, which makes it difficult for a wearer who has a lot of sleeping postures to have a pressing mark on the skin and which is hard to get stuffy.

Hereinafter, the present invention will be described based on the preferred embodiment thereof with reference to the drawings. In the description of the drawings below, the same or similar parts are designated by the same or similar reference numerals. The drawings are basically schematic, and the ratio of each dimension may differ from the actual one.

The pants-type absorbent article of the present invention has a vertical direction (direction indicated by reference numeral "X" in the figure) corresponding to the front-back direction of the wearer, that is, a direction extending from the ventral side to the dorsal side via the crotch portion, and the vertical direction. It has a lateral direction (direction indicated by reference numeral “Y” in the figure) orthogonal to the direction.
In the following description, unless otherwise specified, the vertical direction is the vertical direction of the absorbent article or the direction along the vertical direction of its constituent members (for example, an absorber), and the horizontal direction is the lateral direction of the absorbent article or its constituents. This is the direction along the lateral direction of the constituent members.
The pants-type absorbent article of the present invention has a crotch portion (the portion indicated by the reference numeral "B" in the figure) arranged in the crotch portion of the wearer and a ventral side arranged on the ventral side of the wearer rather than the crotch portion. It is divided into a part (the part indicated by the symbol "A" in the figure) and a dorsal part (the part indicated by the symbol "C" in the figure) arranged on the back side of the wearer from the inseam, and the absorber (the part). An absorbent main body (member indicated by the reference numeral "2" in the figure) including the reference numeral "5" in the figure) and an exterior body (the member indicated by the reference numeral "2" in the figure) arranged on the non-skin facing surface side of the absorbent main body (reference numeral "10" in the figure). ”).
In the present specification, the "skin facing surface" is a surface of the absorbent article or a component thereof (for example, an exterior body) that is directed toward the wearer's skin side when the absorbent article is worn, that is, the wearer's skin relatively. The "non-skin facing surface" is the surface of the absorbent article or its constituents that faces the opposite side of the skin when the absorbent article is worn, that is, relatively far from the wearer's skin. On the side. The term "when worn" as used herein means a state in which the normal proper wearing position, that is, the correct wearing position of the absorbent article is maintained.
In the pants-type absorbent article of the present invention, both side edges of the ventral and dorsal exterior bodies are joined to each other along the vertical direction, and the waist opening (the portion indicated by the reference numeral "WH" in the figure) and A pair of leg openings (parts indicated by reference numeral "LH" in the figure) are formed.
1 to 5 show a pants-type disposable diaper 1 which is an embodiment of the pants-type absorbent article of the present invention, and the diaper 1 has the above-mentioned configuration.

In the present embodiment, both side edge portions 10S along the vertical direction X of the outer body 10 of each of the ventral side portion A and the dorsal side portion C are joined to each other to form a pair of side joint portions S. The means for joining the exterior bodies 10 to each other in the side joint portion S is not particularly limited, and examples thereof include fusion, adhesives, sewing, etc., depending on the use of the pants-type absorbent article, the material of the exterior body 10, and the like. It can be selected arbitrarily. Typically, the means of joining the exterior bodies 10 to each other in the side joint portion S of the pants-type disposable diaper is fusion and / or adhesive, and the joining of the exterior bodies 10 to each other in the side joint portion S of the pants-type sanitary shorts. The means is sewing. The side joint portion S of the present embodiment is a so-called side seal portion in which both side edge portions 10S of the exterior body 10 are joined by fusion, and as shown in FIG. 1, it protrudes outward from the peripheral portion.

Diaper 1 is divided into front body F and back body R. The front body F is the ventral side of the wearer's body when worn, with reference to the vertical center line CLx that bisects the expanded and extended diaper 1 in the vertical direction X and extends in the horizontal direction Y as shown in FIG. The rear body R is a portion that covers the back side (rear side) of the wearer's body. The "expanded and extended state" as used herein means that the diaper 1 is separated by the side joint S to be in the expanded state, and the diaper 1 in the expanded state is extended with the elastic members of each part to have design dimensions (the influence of the elastic members is completely affected). It means the state of being expanded until it becomes the same as the dimensions when it is expanded in a plane with it removed.

The ventral part A is a part of the front body F, and the dorsal part C is a part of the back body R. The inseam B straddles the vertical center line CLx in the vertical direction X, and exists from the front body F to the back body R. The ventral portion A and the dorsal portion C are typically portions that are co-located with the side junction S in the longitudinal direction X, respectively. The inseam B typically has a region where leg openings LS and LS, which are recesses for forming leg openings LH and LH, are formed on both side edges 10S along the vertical direction X of the exterior body 10. Including the excretion portion facing portion which is arranged to face the excretion portion such as the wearer's penis when the diaper 1 is worn.
In the present invention, the ventral portion A, the inseam B, and the dorsal portion C can be each region when the unfolded and extended diaper 1 is divided into three equal parts in the vertical direction X.

In this embodiment, as shown in FIG. 2, the ventral portion A and the dorsal portion C are the iliac region D2 corresponding to the site from the iliac crest to the anterior superior iliac spine of the wearer, respectively, and the iliac region D2. The waist region D1 located outside the vertical direction X (above the diaper 1) from the region D2 and the waist circumference region D3 located inside the vertical direction X (below the diatom 1) with respect to the region D2. Have. The iliac crest and the anterior superior iliac spine as used herein are anatomical terms. The waist region D1 is located on the outermost side of the vertical direction X of each of the ventral side portion A and the dorsal side portion C, and includes a vertical end 1E which is one of both ends of the vertical direction X of the diaper 1. The vertical end 1E of the diaper 1 is also the vertical end of the exterior body 10.
In the present invention, the waist region D1, the iliac region D2, and the waist circumference region D3 have the ventral side portion A or the dorsal side portion C (the portion at the same position as the side joint portion S in the vertical direction X) in the vertical direction X. It can be each area when divided into equal parts.
In the present embodiment, the ventral portion A and the dorsal portion C are basically configured in the same manner, and the description of either one is applied to the other unless otherwise specified.

In the present embodiment, the absorbent main body 2 has a rectangular shape in a plan view, is arranged in the central portion of the exterior body 10 in the horizontal direction Y so that its longitudinal direction coincides with the vertical direction X of the diaper 1, and has a belly. It extends in the vertical direction X from the side portion A to the dorsal side portion C. The absorbent body 2 is bonded to the exterior body 10 with an adhesive.
As shown in FIGS. 4 and 5, the absorbent body 2 includes an absorber 5, a liquid-permeable surface sheet 3 arranged on the skin facing surface side of the absorber 5, and a non-skin facing surface of the absorber 5. It is configured to include a leak-proof (specifically, liquid-impermeable, impermeable or water-repellent) back surface sheet 4 arranged on the side. The absorber 5 contains at least an absorbent core mainly composed of a water-absorbent material such as wood pulp or a water-absorbent polymer, and further, as a liquid-permeable core wrap sheet covering the outer surface of the absorbent core, is a paper or non-woven fabric. Etc. may be included. As the constituent member of the absorbent main body 2, those usually used in this kind of absorbent article can be used without particular limitation. For example, as the surface sheet 3, various non-woven fabrics, perforated films, and the like can be used. As the back sheet 4, a resin film, a laminate of the resin film and a non-woven fabric, or the like can be used. The constituent members of the absorbent main body 2 are integrated with each other by a known joining means such as an adhesive.
A pair of leak-proof sheets composed of liquid-resistant or water-repellent and breathable leak-proof cuff forming sheets 60 on both sides of the absorbent body 2 on the skin-facing surface (surface sheet 3 side) along the vertical direction X. Cuffs 6 and 6 are provided. One or a plurality of thread-shaped elastic members 61 for forming a leak-proof cuff are fixed to the free end of each leak-proof cuff 6 so as to be extendable in the vertical direction X. The leak-proof cuff 6 stands up on the wearer's skin side at least at the inseam B due to the contraction of the elastic member 61, whereby the outflow of body fluid in the lateral direction Y is prevented. The pants-type absorbent article of the present invention does not have to be provided with the leak-proof cuff 6.

Hereinafter, the exterior body 10 which is the main part of the diaper 1 will be described in detail. The exterior body 10 includes an outer layer sheet 11 arranged at a position relatively far from the absorber 5 and an inner layer sheet 12 arranged at a position relatively close to the absorber 5.

In the present embodiment, in the exterior body 10, the portion corresponding to the inseam B (the central region of the vertical direction X) is convex toward the center of the horizontal direction Y in the expanded and extended state of the diaper 1 as shown in FIG. The portion corresponding to the ventral side A and the dorsal side C (the end region of the vertical direction X) has a rectangular shape in which the length of the horizontal direction Y is longer than that of the vertical direction X. The exterior body 10 as a whole has an hourglass shape.
As shown in FIGS. 3 and 5, the outer layer sheet 11 includes a ventral outer layer sheet 11A corresponding to the ventral side A, an inseam outer layer sheet 11B corresponding to the inseam B, and a dorsal side corresponding to the dorsal side C. Includes outer layer sheet 11C. Each outer layer sheet 11A, 11B, 11C forms the outer surface of the diaper 1. The outer layer sheets 11A, 11B, and 11C are laminated with each other at the ends in the vertical direction X, and are joined to each other by known joining means such as an adhesive, a heat seal, a high frequency seal, and an ultrasonic seal at the overlapped portion. It has been transformed. In the superposed portion of the sheets 11A and 11C and the sheet 11B, the sheet 11B located at the center of the vertical direction X is located relatively close to the absorbent main body 2, and both ends of the sheet 11B in the vertical direction X are located. The non-skin facing surface of the portion is covered with sheets 11A and 11C (see FIG. 5).
The inner layer sheet 12 includes a ventral inner layer sheet 12A corresponding to the ventral side A and a dorsal inner layer sheet 12C corresponding to the dorsal side C. Both sheets 12A and 12C are arranged so as to be separated from each other.
In the present invention, the outer layer sheet 11 and the inner layer sheet 12 may each have the form of one continuous sheet instead of the form including such a plurality of sheets.
The following description of the outer layer sheet 11 applies to the sheets 11A, 11B, and 11C unless otherwise specified. Further, the following description of the inner layer sheet 12 applies to the ventral inner layer sheet 12A and the dorsal inner layer sheet 12C unless otherwise specified.

The outer layer sheet 11 and the inner layer sheet 12 may be the same type of sheet or different types of sheets. In this embodiment, as will be described later, the former includes a stretchable sheet and the latter is a non-stretchable sheet, which are different from each other.
The plurality of sheets 11A, 11B, 11C constituting the outer layer sheet 11 may be sheets of the same type or different types. In the present embodiment, the ventral outer layer sheet 11A and the dorsal outer layer sheet 11C are the same type of sheet (expandable sheet 20), but both sheets 11A and 11C and the inseam outer layer sheet 11B are different sheets (non-expandable). Sheet).
The plurality of sheets 12A and 12C constituting the inner layer sheet 12 may be sheets of the same type or different types of sheets. In the present embodiment, the ventral inner layer sheet 12A and the dorsal inner layer sheet 12C are sheets of the same type (non-stretchable sheet).
In the present specification, "same type of sheet" means sheets having the same sheet manufacturing process, type of sheet constituent fibers, fiber diameter and length of constituent fibers, sheet thickness, basis weight, and the like. Means. If at least one of these is different, it is a "heterogeneous sheet".

The basis weight of the outer layer sheet 11 (when the outer layer sheet 11 has a laminated structure, the basis weight of the laminated structure) is not particularly limited, but is preferably 20 g / m ² or more, more preferably 30 g / m ² or more, and preferably. Is 60 g / m ² or less, more preferably 55 g / m ² or less.
The basis weight of the inner layer sheet 12 (when the inner layer sheet 12 has a laminated structure, the basis weight of the laminated structure) is not particularly limited, but is preferably 13 g / m ² or more, more preferably 15 g / m ² or more, and preferably. Is 30 g / m ² or less, more preferably 25 g / m ² or less.

At least a part of the exterior body 10 is a composite expansion / contraction portion 10E having elasticity in the lateral direction Y. In the composite telescopic portion 10E, as shown in FIG. 4, the outer layer sheet 11 and the inner layer sheet 12 are joined by a plurality of joint portions 13 intermittently arranged in the lateral direction Y.
The composite expansion / contraction portion 10E includes an expansion / contraction member that imparts elasticity to the composite expansion / contraction portion 10E. In other words, the composite telescopic portion 10E is a portion of the exterior body 10 in which an elastic member having elasticity in the lateral direction Y is arranged. The elastic member is not particularly limited, and may be, for example, an elastic sheet or a thread-shaped or strip-shaped elastic member. The composite elastic member 10E may include a plurality of types of the elastic member (for example, both the elastic sheet and the elastic member). For example, when at least one of the outer layer sheet 11 and the inner layer sheet 12 is a stretchable sheet (stretchable member) having elasticity in the lateral direction Y, the arrangement portion of the stretchable sheet may be a composite stretchable portion 10E. Further, when a plurality of elastic members (expandable members) are extensiblely fixed between both sheets 11 and 12, even if both of the sheets 11 and 12 are not elastic sheets, the elastic members The arrangement portion of may be the composite elastic portion 10E.

In the present embodiment, the outer layer sheet 11, more specifically, the ventral outer layer sheet 11A and the dorsal outer layer sheet 11C are each composed of a stretchable sheet 20 (see FIG. 6) described later, and have elasticity in the lateral direction Y. On the other hand, the inner layer sheets 12 (12A, 12C) are made of non-stretchable sheets and do not have elasticity. That is, in the present embodiment, the outer layer sheet 11 is an elastic member that imparts elasticity to the composite elastic portion 10E, but the inner layer sheet 12 is not the elastic member. In the exterior body 10, the portion where the outer layer sheets 11A and 11C which are elastic sheets and the inner layer sheets 12A and 12C which are non-expandable sheets are joined via the joint portion 13 has elasticity in the lateral direction as a whole. It has a composite telescopic portion 10E. Therefore, in the present embodiment, the arrangement portion of the outer layer sheets 11A and 11C, that is, the arrangement portion of the expansion / contraction sheet 20, is the composite expansion / contraction portion 10E.

Explaining the stretchable sheet that can be used as a constituent member of the composite stretchable portion 10E, the stretchable sheet preferably has a maximum elongation of 50% or more in the lateral direction Y, and the sheet is stretched to 100% in the lateral direction Y. It is preferable that the elongation recovery rate (that is, the elongation recovery rate at 100% elongation) when contracted after being allowed to grow is at least 70% or more.
The stretchable sheet has a higher maximum elongation and a higher elongation recovery rate in the horizontal direction Y than in the vertical direction X. More specifically, the stretchable sheet preferably has a maximum elongation of 50% or more and an elongation recovery rate of 70% or more in the lateral direction Y and contracts after elongation, but does not contract after elongation in the longitudinal direction X. .. The elongation recovery rate of the sheet is measured by the following measuring method.

<Measurement method of elongation recovery rate>
Prepare a sample piece having a length of 50 mm and a width of 25 mm from the sheet (expandable sheet) to be measured. A sample piece is fixed between chucks (chuck spacing K0) of a tensile tester (Orientec Co., Ltd. "Tencilon" RTC-1150A) in a non-stretchable and slack state, and the chuck spacing is widened at a tensile speed of 300 mm / min. After pulling the sample piece to the length K2 (= K0 × 2) when the sample piece is 100% stretched, the chucks are narrowed at the same speed as the tensile speed, and the tensile stress becomes 0. Let the length of the sample piece in 1 be the length K1 after elongation and recovery. The elongation recovery rate at 100% elongation of the sheet to be measured is calculated by the following equation.
Elongation recovery rate at 100% elongation (%) = [(K2-K1) / (K2-K0)] × 100

Examples of the elastic sheet include (1) an elastic non-woven fabric in which an expandable fiber layer is integrated on both sides or one side of an elastic fiber layer, and (2) a fiber layer that can be extended on both sides or one side of a net-shaped elastic sheet. Elastic non-woven fabric in which is integrated, (3) Elastic non-woven fabric in which an stretchable fiber layer is integrated on both sides or one side of an elastic sheet made of an elastic film, (4) One-way without intersecting each other A stretchable nonwoven fabric or the like in which a large number of elastic filaments arranged so as to be stretched are bonded to an stretchable fiber layer over the entire length thereof in a substantially non-stretched state can be preferably used.
The "extensible fiber layer" referred to here is defined as a fiber layer that can be stretched before being integrated with an elastic material, and can be stretched by machining or the like after being integrated with an elastic material. Includes a fibrous layer.
As a method of integrating the elastic fiber layer and the stretchable fiber layer, for example, a method of laminating them and entwining the fibers by water flow entanglement or air through, a method of joining by heat embossing, an adhesive, ultrasonic waves or the like. Can be mentioned.

FIG. 6 shows an elastic sheet 20 which is an example of an elastic sheet. The elastic sheet 20 corresponds to the elastic nonwoven fabric of (4) above. The elastic sheet 20 includes a fiber layer that can be extended in the lateral direction Y and a plurality of elastic filaments 23 that are joined to one surface of the fiber layer and extend in the lateral direction Y. In the form shown in FIG. 6, the fiber layer includes two fiber sheets 21 and 22 facing each other, and a plurality of elastic filaments 23 are interposed and arranged between the fiber sheets 21 and 22.
The stretchable sheet 20 can be manufactured, for example, according to the method described in JP-A-2009-61743. Specifically, for example, while a plurality of elastic filaments 23 in a molten state spun from a spinning nozzle are taken up at a predetermined speed and stretched, the elastic filaments 23 do not intersect each other before solidification. After the elastic filaments 23 are fused to the fiber sheets 21 and 22 so as to be arranged in the direction, both sheets 21 and 22 to which the elastic filaments 23 are fused are stretched along the extending direction of the elastic filaments 23. Thereby, the elastic sheet 20 can be manufactured.

The entire stretchable sheet 20 has elasticity in one direction (horizontal direction Y). In the elastic sheet 20, the pitch P (see FIG. 6) of the elastic filament 23 that imparts elasticity to the elastic sheet 20 in the lateral direction Y is relatively short, and the plurality of elastic filaments 23 are relatively high in the vertical direction X. The elastic filaments 23 are arranged in a density, and the entire elastic sheet 20 has elasticity in the lateral direction Y due to the arrangement of the elastic filaments 23. The pitch P of the elastic filaments 23, that is, the distance P between the centers of any two elastic filaments 23, 23 adjacent to each other in the vertical direction X is preferably 3 mm or less from the viewpoint of imparting elasticity to the entire elastic sheet 20. More preferably, it is 2 mm or less. The lower limit of the pitch P of the elastic filament 23 is not particularly limited, but is preferably 0.5 mm or more, more preferably 1 mm or more.

Both of the two fiber sheets 21 and 22 constituting the elastic sheet 20 can be extended in the same direction as the elastic filament 23 extends (horizontal direction Y). The "extensible" here means that (a) the constituent fibers of the fiber sheets 21 and 22 are elongated, and (b) the constituent fibers themselves are not elongated, but the fibers bonded at the intersections are connected to each other. This includes the case where the three-dimensional structure formed by a plurality of fibers is structurally changed due to separation, the fibers are bonded to each other, or the constituent fibers are torn off, and the fiber sheets 21 and 22 are elongated as a whole. ..

The elastic filament 23 is formed by stretching an elastic resin in a molten or softened state. Each of the plurality of elastic filaments 23 is continuously arranged over the entire length of the elastic sheet 20 in the lateral direction Y. The plurality of elastic filaments 23 are arranged so as to extend in one direction (horizontal direction Y) without intersecting each other. The elastic filament 23 is bonded to the two sheets 21 and 22 in a substantially non-stretched state. The bonding between the elastic filament 23 and the fiber sheets 21 and 22 is performed by fusing the constituent fibers (non-elastic fibers) of both sheets 21 and 22 to the elastic filament 23 in a state of being embedded in the elastic filament 23. It is not made by using an adhesive such as a hot melt type adhesive. Therefore, there is no adhesive between the fiber sheets 21 and 22 (extensible fiber layer mainly composed of inelastic fibers) and the elastic filament 23 bonded to the fiber sheets 21 and 22.

The elastic sheet 20 can be expanded and contracted in the same direction as the elastic filament 23 extends (horizontal direction Y). The elasticity of the elastic sheet 20 is exhibited due to the elasticity of the elastic filament 23. When the elastic sheet 20 is stretched in the same direction as the elastic filament 23 extends, the elastic filament 23 and the fiber sheets 21 and 22 are stretched. When the stretchable sheet 20 is released from stretching, the elastic filament 23 contracts, and the fiber sheets 21 and 22 return to the state before stretching as the stretchable sheet 20 shrinks. Further, in the elastic sheet 20, as described in Japanese Patent Application Laid-Open No. 2009-61743, both sheets are formed by stretching the fiber sheets 21 and 22 along the extending direction of the elastic filament 23 at the time of manufacturing the elastic sheet 20. The bonds between the 21 and 22 fibers are partially broken, so that both sheets 21 and 22 are provided with "stretch margins". Specifically, as shown in FIG. 9, the fiber sheets 21 and 22 of the elastic sheet 20 manufactured through such a stretching treatment are composed of a high-density portion 24 having a relatively high density of constituent fibers. The low-density portions 25, which have relatively low fiber densities, are alternately formed in the extending direction of the elastic filament 23. Therefore, the fiber sheets 21 and 22 are elastic due to the easy deformation of the low-density portions 25. It is possible to follow the expansion and contraction of the filament 23. Therefore, when the stretchable sheet 20 is stretched in the extending direction (horizontal direction Y) of the elastic filament 23, the stretchable sheet 20 can be stretched with almost no so-called width shrinkage, that is, shrinkage in the lateral direction Y. Further, the expansion / contraction sheet 20 has a relatively small change in apparent thickness due to expansion / contraction, and can be a flat sheet even if it expands / contracts. In the form shown in FIG. 9, the elastic sheet 20 is used as the outer layer sheet 11, and the outer layer sheet 11 has the above-mentioned characteristics. The details of the form shown in FIG. 9 will be described later.

The two fiber sheets 21 and 22 constituting the elastic sheet 20 may be short fiber non-woven fabrics, respectively. Examples of the non-woven fabric include air-through non-woven fabric, heat roll non-woven fabric, spunlace non-woven fabric, spunbond non-woven fabric, melt blown non-woven fabric and the like. Both sheets 21 and 22 may be of the same type or different from each other.
The elastic filament 23 constituting the elastic sheet 20 is made of, for example, a thermoplastic elastomer, rubber, or the like. In particular, when a thermoplastic elastomer is used as a raw material, melt spinning using an extruder is possible as in the case of a normal thermoplastic resin, and the elastic filament thus obtained is easily heat-fused, so that the elastic sheet can be expanded and contracted. 20 is suitable. Examples of the thermoplastic elastomer include styrene such as SBS (styrene-butadiene-styrene), SIS (styrene-isoprene-styrene), SEBS (styrene-ethylene-butadiene-styrene), and SEPS (styrene-ethylene-propylene-styrene). Examples thereof include olefin-based elastomers (ethylene-based α-olefin elastomers, styrene-based elastomers obtained by copolymerizing ethylene, butene, octene, etc.), polyester-based elastomers, polyurethane-based elastomers, etc., and one of these may be used alone or. Two or more types can be used in combination. Further, a core-sheath type or side-by-side type composite fiber made of these resins can also be used.

In the present embodiment, as described above, the inner layer sheet 12 (12A, 12C) is made of a non-stretchable sheet. Further, the inseam outer layer sheet 11B, which is a part of the outer layer sheet 11, is also made of a non-stretchable sheet. It is preferable that the non-stretchable sheet has a stretch recovery rate of 20% or less measured by the above-mentioned <method for measuring stretch recovery rate>, or breaks before 100% stretch.
As the non-stretchable sheet, non-woven fabrics produced by various manufacturing methods can be used, and examples thereof include spunbonded non-woven fabrics, air-through non-woven fabrics, and needle punched non-woven fabrics. The non-stretchable sheet ( inner layer sheets 12A, 12C, outer layer sheet 11B) may have a single-layer structure, or may be a laminated structure in which two or more sheets (nonwoven fabric) are laminated, and typically has a single-layer structure.

In the present embodiment, a plurality of waist circumference gathers are provided on the portions of the composite elastic portion 10E (exterior body 10) corresponding to the ventral side portion A and the dorsal side portion C (waist region D1, iliac region D2, waist circumference region D3). The forming elastic member 7 is arranged so as to be expandable and contractible in the lateral direction Y. The plurality of elastic members 7 are fixed by an adhesive so as to be extendable in the horizontal direction Y between the outer layer sheets 11 (11A, 11C) and the inner layer sheets 12 (12A, 12C) constituting the exterior body 10, and are fixed in the vertical direction. It is intermittently arranged in X. That is, in the present embodiment, the composite stretchable portion 10E is a stretchable member that imparts elasticity to the composite stretchable portion 10E, in addition to the stretchable sheet 20 constituting the outer layer sheet 11, further the outer layer sheet 11 and the inner layer sheet 12. An elastic member 7 is provided between the elastic members 7 so as to be expandable and contractible in the lateral direction Y.
In the natural state or the wearing state of the diaper 1, a plurality of folds extending in a direction intersecting the contraction direction of the elastic member 7 on the portions corresponding to the ventral side portion A and the dorsal side portion C of the exterior body 10 due to the contraction of the elastic member 7. (Gathers) are formed, thereby forming annular girth gathers in which the folds are substantially continuous over the entire circumference of each of the ventral portion A and the dorsal portion C. The portion of the elastic member 7 that overlaps with the absorber 5 (absorbent body 2) in a plan view is subjected to expansion / contraction inhibition treatment such as cutting and heating (see FIG. 3).
Further, in the present embodiment, one or a plurality of leg gather forming elastic members 8 are arranged on the leg edge portion LS forming the opening edges of each of the pair of leg openings LH and LH. The elastic member 8 is stretchably fixed between the outer layer sheet 11 (11A, 11C) and the inner layer sheet 12 (12A, 12C) with an adhesive. In the natural state or the wearing state of the diaper 1, a plurality of folds extending in a direction intersecting the contraction direction of the elastic member 8 on the portion constituting the opening edge portion of the leg opening LH in the exterior body 10 due to the contraction of the elastic member 8 ( Gathers) are formed, thereby forming annular leg gathers in which the folds are substantially continuous over the entire circumference of the opening edge of the leg opening LH.

Unless otherwise specified, various known elastic materials usually used for this kind of absorbent article can be used without particular limitation as materials for various elastic members in diaper 1, including elastic members 7 and 8. Examples thereof include synthetic rubbers such as styrene-butadiene, butadiene, isoprene and neoprene, natural rubbers, EVA, elastic polyolefins and polyurethanes. As the form of the elastic member, a thread-like (thread rubber, etc.) or string-like (flat rubber, etc.) having a rectangular, square, circular, polygonal cross section, or a multifilament type thread-like member is preferably used. can.

At least one of the ventral side portion A and the dorsal side portion C is provided with an exterior body folded portion 14 including a portion in which the composite telescopic portion 10E is folded with the inner layer sheet 12 inside. In the present embodiment, as shown in FIGS. 2 and 5, exterior body folded portions 14 are provided on both the ventral side portion A and the dorsal side portion C. FIG. 7 shows a cross section of the ventral body folded portion 14 along the lateral direction Y, and FIG. 8 shows a perspective view of the exterior body folded portion 14 as viewed from the outer surface side 14a. There is. 7 and 8 both show an exterior body in a natural state of the diaper 1 (a state in which an external force is not applied to the diaper 1), that is, an exterior body in a non-extended state such as an elastic member or an elastic sheet provided in the exterior body 10. The state of the folded-back portion 14 is schematically shown. Hereinafter, the exterior body folded-back portion 14 of the ventral side portion A will be described as an example, but such description is also applied to the exterior body folded-back portion 14 of the dorsal side portion C unless otherwise specified.

The exterior body folded-back portion 14 is a portion formed by folding back a composite elastic portion 10E including a two-layer structure of an outer layer sheet 11 (11A, 11C) and an inner layer sheet 12 (12A, 12C), and is composed of four sheets. Includes a four-layer structure including. The outer body folded portion 14 is located on the outer side in the thickness direction of the folded curve of the composite stretchable portion 10E and forms the outer surface (non-skin facing surface) of the diaper 1 and the folded composite stretchable portion 14a. It is divided into an inner surface side 14b including a portion 10E, which is located inward in the thickness direction of the folding curve and forms an inner surface (skin facing surface) of the diaper 1.

In the present embodiment, the outer layer sheet 11 and the inner layer sheet 12 each have an extension portion extending outward in the vertical direction X from the vertical end 5E of the absorber 5, and the extension of both sheets 11 and 12 thereof. The exterior body folded portion 14 is formed by folding the protruding portion with the inner layer sheets 12A and 12C inside. The vertical end 1E of the diaper 1 coincides with the folding curve of the exterior body 10 at the folding. Therefore, in the present embodiment, the outer body folded portion 14 is arranged at least in the waist region D1 which is the end portion of the diaper 1 in the vertical direction X.
In the present invention, the outer body folded portion 14 may be further arranged in the iliac region D2 and the waist circumference region D3 in addition to the waist region D1.

In the present embodiment, the inner layer sheet 12 has a longer length in the vertical direction X of the portion located on the inner surface side 14b than the outer layer sheet 11.
In the present invention, the size relationship between the lengths of the two sheets 11 and 12 on the inner surface side 14b of the folded portion 14 of the exterior body is not particularly limited, and contrary to the illustrated embodiment, the outer layer sheet 11 is compared with the inner layer sheet 12. It may be long, or both sheets 11 and 12 may have the same length.

In the present embodiment, the composite expansion / contraction portion 10E, that is, the arrangement portion of the expansion / contraction sheet 20 in the exterior body 10, includes all of the following configurations (1) to (3).
(1) A configuration in which the outer layer sheet 11 (11A, 11C) and the inner layer sheet 12 (12A, 12C) are joined by a plurality of joint portions 13 intermittently arranged in both the vertical direction X and the horizontal direction Y. (See FIGS. 4 and 8).
(2) The outer layer sheet 11 (11A, 11C) is made of a stretchable sheet 20 (see FIG. 6) having elasticity in the lateral direction Y, and the inner layer sheet 12 (12A, 12C) is made of a non-stretchable sheet.
(3) A plurality of elastic members 7 extending in the horizontal direction Y are intermittently arranged in the vertical direction X between the outer layer sheets 11 (11A, 11C) and the inner layer sheets 12 (12A, 12C), and each elastic member 7 is arranged. Is fixed so as to be extendable in the lateral direction Y so as not to pass through the joint portion 13. In other words, a plurality of joint portions 13 are intermittently arranged in the horizontal direction Y to form a row, and a plurality of rows of the joint portions 13 extending in the horizontal direction Y are intermittently arranged in the vertical direction X. The rows of 13 and the elastic members 7 are alternately arranged in the vertical direction X (see FIGS. 5 and 8). The elastic member 7 is joined to both sheets 11 and 12 by an adhesive.

In the composite telescopic portion 10E in the natural state, as shown in FIGS. 7 and 8, the inner layer sheet 12 has a plurality of concave portions 120 having a joint portion 13 at the bottom and extending in the vertical direction X, and the concave portion 120. It has a fold structure that is located between them and is composed of a ridge portion 121 having a bent portion 12P of the inner layer sheet 12 as a top. The ridge portion 121 is a portion in which the portion of the inner layer sheet 12 located in the non-formed portion of the joint portion 13 protrudes to the opposite side to the outer layer sheet 11, and the ridge portion 121 is hollow, that is, in the ridge portion 121. There is a space between the outer layer sheet 11 and the inner layer sheet 12.

On the other hand, in the composite elastic portion 10E in the natural state, the outer layer sheet 11 (expandable sheet 20) has one convex portion 121 of the inner layer sheet 12 and a plan view (in the thickness direction of the outer layer sheet 11) as shown in FIG. It has a plurality of bent portions 11P in the overlapping regions (projective view). That is, in the composite stretchable portion 10E in the natural state, the number of bent portions per unit length in the lateral direction Y is larger in the outer layer sheet 11 (stretchable sheet 20) than in the inner layer sheet 12 (non-stretchable sheet). That is, in the composite elastic portion 10E in the natural state, the outer layer sheet 11 is also located between the plurality of concave portions extending in the vertical direction X and the bent portions 11P of the outer layer sheet 11 as in the inner layer sheet 12. Having a fold structure consisting of a ridge portion having a top portion, the pitch (interval) of the ridge portion or the concave portion in the outer layer sheet 11 is shorter than that in the inner layer sheet 12.

The outer layer sheet 11 is used as one of the reasons why the outer layer sheet 11 is deformed so as to be bent by the plurality of bent portions 11P intermittently formed in the lateral direction Y in the composite elastic portion 10E in the natural state. It is conceivable that the stretchable sheet 20 to be formed alternately has "two types of parts having different shapes or physical properties" in the lateral direction Y.
In the present embodiment, as described above, the elastic sheet 20 is stretched in the extending direction (horizontal direction Y) of the elastic filament 23 in the manufacturing process thereof, and the fiber sheet constituting the elastic sheet 20 is formed by this stretching treatment. In 21 and 22, as shown in an enlarged manner in FIG. 9, the elastic filament 23 includes a high-density portion 24 having a relatively high density of constituent fibers and a low-density portion 25 having a relatively low density of constituent fibers. The fibers are alternately formed in the extending direction (horizontal direction Y), and it is considered that such a difference in fiber density promotes bending deformation of the elastic sheet 20 (outer layer sheet 11). In the natural state of the telescopic sheet 20, typically, as shown in FIG. 9, the high-density portion 24 serves as the bending starting point and becomes the bending portion 11P, and the low-density portion between the two adjacent bending portions 11P and 11P. 25 is located. In the enlarged view of the portion surrounded by the dotted line in FIG. 9, only the fiber sheets 21 and 22 are described as the constituent members of the elastic sheet 20, and the elastic filament 23 is not described, but actually. The elastic filament 23 is interposed and integrated between the fiber sheets 21 and 22.
In addition to the above-mentioned "fiber density", for example, the "shape or physical properties" in the above-mentioned "two types of sites having different shapes or physical properties" that can promote bending deformation of the outer layer sheet 11 (expandable sheet 20) include, for example. , Rigidity, distance between fibers, basis weight, presence / absence of stretching treatment, degree of fiber end, degree of flatness, etc.

The composite stretchable portion 10E is typically joined to the non-stretchable inner layer sheet 12 in a state where the elastic member 7 is stretched in the lateral direction Y, and the outer layer sheet 11 (stretchable sheet 20) is joined in the lateral direction. It is produced by joining at the joining portion 13 in a state of being stretched to Y, and then releasing the elastic member (elastic member 7 and outer layer sheet 11) from the stretched state to bring it into a natural state. In the natural state of the composite expansion / contraction portion 10E thus produced, the expansion / contraction member contracts in the lateral direction Y, so that the inner layer sheet 12 is deformed so as to bend between the joint portions 13 and 13 adjacent to each other in the lateral direction Y. On the inner layer sheet 12 after the deformation, the convex portion 121 having the bent portion 12P as the top and the concave portion 120 having the joint portion 13 at the bottom are alternately arranged in the lateral direction Y. On the other hand, the outer layer sheet 11 made of the elastic sheet 20 is deformed so as to be bent by a plurality of bent portions 11P intermittently formed in the lateral direction Y like the inner layer sheet 12, but the uneven pitch thereof is the inner layer sheet. It is shorter than that in 12, and the height of the ridges of the outer layer sheet 11 is lower than the height of the ridges 121 of the inner layer sheet 12 (the depth of the ridges of the outer layer sheet 11 is lower than that of the inner layer sheet 12). (It is shallower than the depth of the concave portion 120), so that the outer layer sheet 11 looks like a flat sheet without unevenness in some cases.

As described above, the exterior body folded portion 14 has a laminated structure by folding the composite elastic portion 10E having an uneven structure in a natural state, so that it is excellent in cushioning property and breathability. Further, the surface of the folded-back portion 14 of the exterior body, which can come into contact with the skin of the wearer of the diaper 1, is formed by the outer layer sheet 11 having a relatively small degree of unevenness, and is typically substantially flat. The burden on the wearer's skin is small, and even a wearer with many sleeping postures does not easily have pressure marks on the skin. Since the diaper 1 is configured such that the exterior body 10 includes the exterior body folded portion 14 having such a feature, even a wearer who has a lot of sleeping postures does not easily have pressure marks on the skin and is less likely to get stuffy.

In the composite stretchable portion 10E in the natural state, a region of the outer layer sheet 11 (stretchable sheet 20) that overlaps with one convex portion 121 in a plan view (between two joint portions 13 and 13 adjacent to each other in the lateral direction). The number of bent portions 11P existing in the outer layer sheet 11 (total number of those existing on one surface side of the outer layer sheet 11 and those existing on the other surface side) is the type of the constituent member of the composite elastic portion 10E including the outer layer sheet 11. Although it depends on the basis weight, the elongation characteristics of the elastic sheet 20 and the elastic member 7, and the like, preferably two or more, more preferably, from the viewpoint of ensuring the action and effect of the outer body folded portion 14 more reliably. 3 or more. The upper limit of the number of such bent portions 11P is not particularly limited, but is preferably 10 or less, more preferably 5 or less, from the viewpoint of preventing a decrease in strength of the elastic sheet 20 due to an increase in the low density portion 25. be.
The length (width) of one convex portion 121 in the lateral direction Y, that is, the distance between the two joint portions 13 and 13 adjacent to each other in the lateral direction Y is preferably 2 mm or more, more preferably 3 mm or more, and It is preferably 15 mm or less, more preferably 10 mm or less.

The above-mentioned "number of bent portions 11P in the outer layer sheet 11" is determined by, for example, observing a cross section of the outer layer sheet 11 along the thickness direction in the expansion / contraction direction with a microscope at an arbitrary magnification from the stretched state of the outer layer sheet 11. In the process of changing to the natural length state (non-extended state), it is formed in a region (between two joints 13 and 13 adjacent to each other in the lateral direction) that overlaps with one convex portion 121 in a plan view. It can be measured by visually counting the number of bent portions 11P. Hereinafter, this measurement method is also referred to as "measurement method A". In the measurement method A, the bent portion 11P to be counted has an apparent thickness of the outer layer sheet 11 that is at least twice the thickness of the outer layer sheet 11 in the extended state (the state in which the bent portion 11P is not substantially formed). In a certain case, the height of the convex portion of the outer layer sheet 11 having the bent portion 11P as the top is the same as the height of the convex portion 121 of the inner layer sheet 12 that overlaps the convex portion in a plan view, or the convex portion. It shall be lower than the height of the portion 121.

The measurement method A is difficult to apply when the size of the bent portion 11P is relatively small and it is difficult to visually recognize it. For example, when the outer layer sheet 11 is a stretchable sheet 20 manufactured by a method accompanied by a stretching treatment as described in Japanese Patent Application Laid-Open No. 2009-61743, the bent portion 11P tends to be fine and the bent portion 11P is likely to be fine. It is often difficult to measure the number of 11Ps by the measuring method A. In such a case, the composite telescopic portion 10E (the portion of the exterior body 10 in which the stretchable member having elasticity in the lateral direction is arranged) is cut out from the exterior body 10, and the cut out composite stretchable portion 10E is brought into an extended state to be high. The above-mentioned "number of bent portions 11P in the outer layer sheet 11" can be measured by a method of counting the numbers of the density portions 24 and the low density portions 25 (hereinafter, also referred to as "measurement method B"). That is, referring to FIG. 9, the bent portion 11P is formed by the expansion and contraction of the elastic filament 23 and the deformation of the low density portion 25 without deforming the high density portion 24. Therefore, the outer layer sheet 11 (expandable sheet 20) is formed. ), The convex or concave portion is for "combination of two low-density portions 25 and one high-density portion 24" or "combination of one low-density portion 25 and two high-density portions 24". Is formed. Therefore, in the measurement method B, the outer layer sheet 11 (expandable sheet 20) in the stretched state is observed, the numbers of the high-density portion 24 and the low-density portion 25 in that state are counted, and the count number and the joint portion 13 are counted. Based on the number, the above-mentioned "number of bent portions 11P in the outer layer sheet 11" is calculated.

When the composite stretchable portion 10E (exterior body folded portion 14) is compressed in the thickness direction, specifically, for example, when a load of 3 kPa is applied to the composite stretchable portion 10E and compressed in the thickness direction, the outer layer sheet 11 (stretchable sheet 20) is compressed. ), It is preferable that the reduction rate of the thickness is higher than that of the inner layer sheet 12. The rate of decrease in thickness is calculated by the following equation.
Thickness reduction rate (%) = {(thickness of sheet before compression-thickness of sheet in compressed state) / thickness of sheet before compression} x 100
The outer layer sheet 11 (expandable sheet 20) forms the surface of the folded portion 14 of the exterior body and can come into contact with the skin of the wearer of the diaper 1, and the reduction rate of the thickness of the outer layer sheet 11 is reduced to the inner layer sheet 12. Compared to the above, that is, the outer layer sheet 11 is easily compressed and deformed, and when compressed with a constant load, it tends to be flat, so that the skin of the wearer of the diaper 1 is less likely to have a pressing mark. On the other hand, since the thickness reduction rate of the inner layer sheet 12 is lower than that of the outer layer sheet 11, the shape of the ridge portion 121 formed in a natural state is easily maintained, and the exterior body folded portion 14 (composite elastic portion 10E) is easily maintained. ) Cushioning property and breathability can be further improved.
Such a magnitude relationship of "decrease rate of thickness of outer layer sheet 11> decrease rate of thickness of inner layer sheet 12" is established when the outer layer sheet 11 and the inner layer sheet 12 are configured as described in the present specification. obtain.

The joint portion 13 may be formed of an adhesive such as a hot melt adhesive, that is, both sheets 11 and 12 may be bonded to each other by an adhesive, but in the present embodiment, the joint portion 13 is both. It is composed of a fused portion of the sheets 11 and 12. If the joint portion 13 is formed of an adhesive, there is a concern that the adhesive may seep out, but since the joint portion 13 is formed from the fused portion, such a concern is dispelled, and the diaper 1 is applied to the wearer's skin. It is possible to further reduce the burden.
In the joint portion 13 composed of the fused portions of both sheets 11 and 12, both sheets 11 and 12 have a film shape or a similar form. The formation of the joint portion 13 by fusing the two sheets 11 and 12 can be carried out by a known method of fusing resin sheets such as embossing with heat and ultrasonic sealing.

As shown in FIG. 8, the joint portion 13 preferably extends in the vertical direction X. With such a configuration, the cushioning property of the outer body folded portion 14 is further improved, and when the wearer of the diaper 1 takes a sleeping posture and a load is applied to the outer body folded portion 14, a good cushioning feeling is obtained. Is obtained. In the "extending in the vertical direction X" here, 1) a plurality of joint portions 13 are intermittently arranged in the vertical direction X to form a row of the joint portions 13 extending in the vertical direction X (see FIG. 8). ) And 2) a form (not shown) in which the joint portion 13 has a continuous linear shape (straight line, curved line, etc.) in a plan view is included. In the form of 1) above, the plan view shape of the joint portion 13 is not particularly limited, and may be, for example, a circular shape, an elliptical shape, a triangular shape, a quadrangular shape, or the like, in addition to the quadrangular shape as shown in the figure. In the case of the form 2) above, the elastic member 7 may intersect the continuous linear joint portion 13.

In the present embodiment, in the composite telescopic portion 10E in the natural state, the ridge portion 121 constituting the fold structure of the inner layer sheet 12 is hollow as shown in FIGS. 7 and 8 as described above, and such ridges are formed. The hollow structure of the portion 121 contributes not a little to the improvement of the cushioning property and the breathability of the folded portion 14 of the exterior body. From the viewpoint of ensuring that the hollow structure of the convex portion 121 is stably maintained while the diaper 1 is worn, the inner layer sheet 12 is preferably more rigid than the outer layer sheet 11 (expandable sheet 20). ..
The rigidity of the sheet constituting the composite telescopic portion 10E (exterior body 10) is measured by the following method.

<Measurement method of rigidity>
From the sheet to be measured, specifically, for example, the outer layer sheet 11 (stretchable sheet 20) or the inner layer sheet 12), the length of the composite stretchable portion 10E including the sheet in the stretch direction (horizontal direction Y of the absorbent article) is 150 mm. A rectangular shape in a plan view having a length of 30 mm in a direction orthogonal to the expansion / contraction direction (longitudinal direction X of the absorbent article) is cut out and used as a test piece. The expansion / contraction direction typically coincides with the flow direction (mechanical direction MD) at the time of manufacturing the sheet. When the sheet to be measured is taken out from the absorbent article (composite elastic part), if the sheet to be measured is joined to another member, a heating means such as a dryer, a cold spray, an organic solvent or the like is used. After invalidating the bonding between the sheet to be measured and other members, the sheet to be measured is carefully peeled off from the other members and isolated.
The test piece is rolled so that the longitudinal direction of the test piece is the circumferential direction, and both ends of the test piece in the longitudinal direction are overlapped by 5 mm to form a cylinder having a diameter of 45 mm. Then, in the overlapping portion at both ends, the upper end and the lower end in the axial direction of the cylinder are designated by Max Co., Ltd. No. A cylindrical measurement sample is prepared by fastening with a staple such as a 10-1M needle. The direction of the staples is parallel to the circumferential direction. Each of the produced cylindrical measurement samples is set up so that its axial direction coincides with the vertical direction, and is set in a compression tester such as "RTA-100" manufactured by Orientec Co., Ltd. Then, the measurement sample is compressed at a compression rate of 10 mm / min in the axial direction of the cylinder by a circular compression plate having a diameter of 70 mm or more, and the maximum load (N / 30 mm) shown at the time of compression is recorded. Five measurement samples are prepared for each type of sheet to be measured, the maximum load of each is measured, and the arithmetic mean value thereof is used as the value of the rigidity of the sheet to be measured.

The ratio of the rigidity of the inner layer sheet 12 to the rigidity of the outer layer sheet 11 (expandable sheet 20) is 1.1 or more, more preferably 1.2 or more, and preferably 1.2 or more as the former / the latter, assuming the former> the latter. It is 3.0 or less, more preferably 2.0 or less.
The rigidity of the outer layer sheet 11 (expandable sheet 20) is preferably 10.0 N or less, more preferably 8.0 N or less, on the premise that it is lower than that of the inner layer sheet 12.
The rigidity of the inner layer sheet 12 is preferably 16.0 N or less, more preferably 15.0 N or less, on the premise that it is higher than that of the outer layer sheet 11 (expandable sheet 20).

In the present embodiment, as described above, as shown in FIGS. 8 and 9, the composite stretchable portion 10E is a stretchable member that imparts elasticity to the composite stretchable portion 10E in addition to the outer layer sheet 11 (stretchable sheet 20). An elastic member 7 is provided between the outer layer sheet 11 and the inner layer sheet 12 so as to be expandable and contractible in the lateral direction. In this elastic member 7, the hollow structure of the ridge portion 121 is formed while the diaper 1 is worn. It contributes to more stable maintenance, and in turn, can contribute to further improvement of the cushioning property and the breathability of the folded portion 14 of the exterior body. That is, while wearing the diaper 1, a part of the outer layer sheet 11 invades the hollow portion of the convex portion 121 in the inner layer sheet 12, whereby the convex portion 121 does not have a substantially hollow structure, and the outer body folded portion 14 In the present embodiment, the elastic member 7 is arranged between the two sheets 11 and 12, so that the convex portion 121 of the outer layer sheet 11 is arranged. Invasion into the hollow is suppressed and such concerns are dispelled.
From the viewpoint of ensuring that the effect of improving the stability of the hollow structure of the convex portion 121 by the elastic member 7 is achieved and preventing the wearer from being excessively tightened by the excessive number of elastic members 7, the vertical portion is formed. The distance 7P (see FIG. 8) between the elastic members 7 and 7 adjacent to each other in the direction X is preferably 4 mm or more, more preferably 5 mm or more, and preferably 10 mm or less, more preferably 8 mm or less.

In order to ensure that the predetermined effect of the present invention, particularly the action and effect of the exterior body folded portion 14, is exerted, the plurality of convex portions 121 of the exterior body folded portion 14 are uniformly aligned along the vertical direction X. It is preferable that the hollow structure is maintained while extending. As one of the factors that influence the formation of the ridge portion 121, the expansion / contraction characteristics of the composite expansion / contraction portion 10E (elongation ratio, extension stress, etc. of the expansion / contraction member) can be mentioned. Further, since the expansion / contraction characteristics of the composite expansion / contraction portion 10E are affected by the absorber 5 that overlaps with the composite expansion / contraction portion 10E in a plan view, the absorber portion 121 can be stably present in a desired form. It is also necessary to consider the arrangement of 5.
In this respect, as shown in FIGS. 2 and 5, in this embodiment, the vertical end 5E of the absorber 5 is longer than the vertical end 1E of the diaper 1 in the ventral portion A and the dorsal portion C, respectively. The region located inward of X and sandwiched between the vertical ends 5E and 1E is the absorber non-arranged region 5N. From the above viewpoint, in the composite expansion / contraction portion 10E, the absorber non-arranged region 5N In the portion located in, the elongation ratio of the stretchable member that imparts elasticity to the composite stretchable portion 10E is lower than that in the portion located in the absorber placement region 5N adjacent to the absorber non-placement region 5N in the vertical direction X. preferable.
In the "absorbent arrangement region", when one virtual straight line (not shown) crossing the ventral side A or the dorsal side C in the lateral direction Y is drawn, the virtual straight line overlaps with the absorber 5. It is a region, in other words, a region in which a projection image of the absorber 5 in the lateral direction Y can be formed in the ventral portion A or the dorsal portion C. In the present embodiment, the regions other than the absorber non-arranged region 5N in each of the ventral portion A and the dorsal portion C are the absorber-arranged regions.
Since the absorber 5 having relatively high rigidity is not arranged in the absorber non-arranged region 5N, it is more susceptible to the expansion / contraction member than the absorber arranged region. Therefore, depending on the expansion / contraction characteristics of the expansion / contraction member included in the composite expansion / contraction portion 10E, the extending direction of the ridge portion 121 of the absorber non-arrangement region 5N is not parallel to the vertical direction X but intersects the vertical direction X. There is a possibility that there may be inconveniences such as the direction of the protrusion 121 and the shape of the convex portion 121 being collapsed so that the hollow structure cannot be maintained. On the other hand, as described above, with respect to the expansion ratio of the expansion / contraction member of the composite expansion / contraction portion 10E, the magnitude relationship of "absorbent non-arrangement region 5N <the absorber arrangement region" is established, so that such an inconvenience occurs. It will be prevented and the predetermined effect of the present invention will be more reliably achieved.

The "elongation ratio" is an index of the tensioning condition of the elastic member (elastic member, elastic sheet, etc.) of the composite elastic member 10E, and the length of the elastic member in the natural state (non-extendable state) is 100. It shows what percentage of the growth is when it is done. The elongation ratio is measured by the following method.
First, an absorbent article (for example, diaper 1) including the elastic member (for example, the elastic member 7) to be measured is brought into a state of being extended to the maximum in the expansion / contraction direction (for example, the lateral direction Y) of the elastic member, and an oil-based pen is used. Then, the elastic member is marked with two marks at regular intervals L0 (eg, 100 mm) in the elastic direction. If the stretchable member is covered with a sheet such as a non-woven fabric, the stretchable member may be marked with an oil-based pen through the sheet, so that the ink of the oil-based pen can pass through the sheet to the stretchable member. And the telescopic member can be marked. Next, a portion sandwiched between the two marks is cut out from the stretchable member, and the length L1 of the cut out stretchable member in a natural state (non-stretched state) is measured. Then, the elongation ratio is obtained by the following formula [1].
Elongation ratio (%) = (L0 / L1) × l00 ... [1]

In the present embodiment, as described above, the composite stretchable portion 10E includes an outer layer sheet 11 (stretchable sheet 20) and an elastic member 7 as stretchable members. In the case where the composite stretchable portion 10E includes a plurality of types of stretchable members as described above, The magnitude relationship may be established for a part of the expansion ratios of the plurality of types of elastic members, or the magnitude relationship may be established for all the expansion ratios of the plurality of types of elastic members. In particular, since the elastic characteristics of the elastic member 7 have a large influence on the formation of the convex portion 121, it is preferable to establish the magnitude relationship at least with respect to the elongation ratio of the elastic member 7.

From the viewpoint of ensuring that the effect of establishing the magnitude relationship of the expansion ratio of the expansion / contraction member of the composite expansion / contraction portion 10E is more reliably achieved, the portion of the composite expansion / contraction portion 10E located in the absorber non-arrangement region 5N is a composite. It is preferable that the elongation stress is lower than that of the stretchable portion 10E located in the absorber placement region.
The "elongation stress" is a load required to extend the portion of the composite expansion / contraction portion 10E by a certain length along the expansion / contraction direction (horizontal direction Y). It's hard to do. The elongation stress is measured by the following method.
The elongation stress of the composite elastic member 10E is, for example, the type of elastic member (expandable sheet, elastic member, etc.) included in the composite elastic member 10E, the arrangement of the elastic member, and the number and arrangement of the elastic member if the elastic member is an elastic member. It can be adjusted by appropriately adjusting the spacing, the thickness of the elastic member, and the like.

In the present embodiment, as shown in FIGS. 2 and 5, the absorber non-placement region 5N includes a waist region D1 corresponding to the wearer's waist circumference, and the absorber placement region is the wearer's iliac crest. It includes the iliac region D2 corresponding to the site from the anterior superior iliac spine to the anterior superior iliac spine, and further includes the waist circumference region D3.
In the magnitude relation regarding the elongation ratio of the expansion / contraction member of the composite expansion / contraction portion 10E and the magnitude relation regarding the elongation stress of the composite expansion / contraction portion 10E, the absorber arrangement region to be compared with the absorber non-arrangement region 5N is at least the ilium. It is preferable to include the region D2. That is, it is preferable that the magnitude relationship of "waist region D1 (absorber non-arranged region 5N) <iliac region D2" is established for each of the elongation ratio and the elongation stress.

<Measurement method of elongation stress>
The case where the pants-type absorbent article to be measured is the above-mentioned diaper 1 will be described as an example. First, the exterior bodies 10 joined by the side joint portion S are peeled off, the diaper 1 is expanded and expanded in a plane, and the measurement target area (composite expansion / contraction portion) is formed along a straight line parallel to the lateral direction Y of the diaper 1. The non-absorbent region 5N in 10E, the portion located in the iliac region D2, etc.) are cut out and used as a measurement sample. At the time of this cutting, not only the composite elastic portion 10E (exterior body 10) but also the entire diaper 1 including the absorbent main body 2 and the like is cut. Further, when an elastic member such as an elastic member 7 that imparts elasticity to the composite elastic portion or a member equivalent thereto (hereinafter, also referred to as “elastic member or the like”) exists in the measurement target region, it is cut out from the measurement target region. The measurement sample includes at least one elastic member or the like in the vertical direction X (direction orthogonal to the extending direction of the elastic member or the like) of the measurement sample.
Both ends (side joint S or its vicinity) in the longitudinal direction (horizontal direction Y) of the measurement sample are sandwiched between chucks of a Tencilon universal testing machine (RTC-1210A) manufactured by ORIENTEC Co., Ltd., and the measurement sample is placed at 300 mm / min. Elongate in the longitudinal direction at the speed of, and measure the stress (elongation stress) of the measurement sample at that time. Specifically, the inner dimensions of the composite telescopic portion 10E, more specifically, the pair of side seal portions S, S in a state where the sheets 11 and 12 constituting the composite telescopic portion 10E by the elastic member 7 are not contracted. When the intervening length is 100 (for example, 350 mm), the tensile load (cN) when the measurement sample is stretched to a length equivalent to 80 (for example, 280 mm) and then contracted to a length equivalent to 71 (for example, 250 mm). ) Is the elongation stress of the measurement sample. The elongation stress of the measurement sample is calculated as the average elongation stress by converting it into the length in the direction (longitudinal direction X) orthogonal to the tensile direction (longitudinal direction of the measurement sample) of the measurement target region.
As mentioned above, the reason why the return force at the length equivalent to 71 when the inner dimension of the exterior body is 100 is specified as the stress of the measurement sample is that the main infant wearing a pants-type absorbent article such as a diaper 1 is used. This is because the length around the abdomen is about 71% of the inner size of the diaper. The length around the abdomen referred to here is an average value around the abdomen measured in a standing position and a sitting position in consideration of the change in the circumference of the abdomen when the posture of the infant changes.

The expansion ratio of the stretchable member (elastic member 7 or outer layer sheet 11) of the portion located in the absorber non-placement region 5N (waist region D1) in the composite stretchable portion 10E, and the absorber placement region (iliac bone) in the composite stretchable portion 10E. As described above, the ratio of the portion located in the region D2) to the expansion ratio of the elastic member is preferably 0.3 or more, more preferably 0.5 or more, and more preferably 0.5 or more as the former / the latter, assuming the former <the latter. It is preferably 0.9 or less, more preferably 0.8 or less.
The expansion ratio of the elastic member of the portion located in the absorber non-arranged region 5N (waist region D1) in the composite elastic portion 10E is the expansion / contraction of the portion located in the absorbent body arrangement region (iliac region D2) in the composite elastic portion 10E. Assuming that it is lower than the elongation ratio of the member, it is preferably 150% or more, more preferably 200% or more, and preferably 300% or less, more preferably 250% or less.
The expansion ratio of the elastic member of the portion located in the absorber placement region (iliac region D2) in the composite expansion / contraction portion 10E is the expansion / contraction of the portion located in the absorber non-arrangement region 5N (waist region D1) in the composite expansion / contraction portion 10E. Assuming that it is higher than the elongation ratio of the member, it is preferably 200% or more, more preferably 250% or more, and preferably 400% or less, more preferably 350% or less.

The elongation stress of the portion located in the absorber non-arrangement region 5N (waist region D1) in the composite expansion / contraction portion 10E and the elongation stress of the portion located in the absorber arrangement region (iliac region D2) in the composite expansion / contraction portion 10E. As described above, the ratio is preferably 0.3 or more, more preferably 0.5 or more, and preferably 0.9 or less, more preferably 0.8 or less as the former / the latter, assuming the former <the latter. be.
The elongation stress of the portion located in the absorber non-arrangement region 5N (waist region D1) in the composite expansion / contraction portion 10E is higher than the elongation stress of the portion located in the absorber arrangement region (iliac region D2) in the composite expansion / contraction portion 10E. It is preferably 0.01 N / mm or more, more preferably 0.02 N / mm or more, and preferably 0.1 N / mm or less, more preferably 0.05 N / mm or less, on the premise that it is low.
The elongation stress of the portion located in the absorber placement region (iliac region D2) in the composite expansion / contraction portion 10E is higher than the elongation stress of the portion located in the absorber non-placement region 5N (waist region D1) in the composite expansion / contraction portion 10E. It is preferably 0.02 N / mm or more, more preferably 0.04 N / mm or more, and preferably 0.2 N / mm or less, more preferably 0.1 / mm or less, on the premise that it is high.

In the exterior body folded portion 14, as shown in FIGS. 7 and 8, the concave portion 120 of the outer surface side 14a (composite expansion / contraction portion 10E located on the outer side in the thickness direction of the exterior body folded portion 14) and the inner surface. It is preferable that the concave portions 120 of the side 14b (folded composite telescopic portion 10E located on the inner side in the thickness direction of the outer body folded portion 14) face each other. With such a configuration, the cushioning property of the outer body folded portion 14 is further improved, and when the wearer of the diaper 1 takes a sleeping posture and a load is applied to the outer body folded portion 14, a good cushioning feeling is obtained. Is obtained.

From the same viewpoint, in the exterior body folded portion 14, as shown in FIGS. 7 and 8, the convex strip of the outer surface side 14a (composite elastic portion 10E located on the outer side in the thickness direction of the exterior body folded portion 14). It is preferable that the portion 121 and the convex portion 121 of the inner surface side 14b (the folded composite telescopic portion 10E located on the inner side in the thickness direction of the outer body folded portion 14) face each other.
Further, as shown in the illustrated form, in the outer body folded portion 14, the convex portion 121 of the outer surface side 14a (one of the opposing composite expansion / contraction portions 10E and 10E) and the inner surface side 14b (the opposite composite expansion / contraction portion) It is preferable that the other of the portions 10E and 10E is adhered to the ridge portion 121 of the folded composite expansion / contraction portion 10E). In the illustrated form, the tops (bent portions 12P) of both convex portions 121 are joined to each other via the adhesive portion 15. The adhesive portion 15 is formed by applying an adhesive such as a hot melt adhesive.

It is preferable that the adhesive portion 15 extends in the vertical direction X from the viewpoint of further improving the cushioning property of the outer body folded portion 14. The "extending in the vertical direction X" here includes 1) a form in which a plurality of adhesive portions 15 are intermittently arranged in the vertical direction X to form a row of adhesive portions 15 extending in the vertical direction X, and 2). The form in which the adhesive portion 15 has a continuous linear shape (straight line, curved line, etc.) in a plan view is included.

FIG. 10 shows the exterior body folded portion 14A, which is another embodiment of the exterior body folded portion according to the present invention. Regarding the exterior body folded-back portion 14A, the above-mentioned exterior body folded-back portion 14 (a configuration different from that of FIG. 7 will be mainly described, and the same configuration will be designated by the same reference numerals and description thereof will be omitted. As for the configuration not particularly described, the description of the exterior body folded-back portion 14 is appropriately applied.

In the exterior folded portion 14A, the composite stretchable portion 10E on the outer surface side 14a (composite telescopic portion 10E located on the outer side in the thickness direction of the exterior body folded portion 14A) and the inner surface side 14b (thickness of the exterior body folded portion 14A). The pattern of the ridge portion 121 is different from that of the folded composite telescopic portion 10E) located on the inner side in the direction. The "pattern of the ridges 121" here means the pitch of the ridges 121 (the distance between the tops of the ridges 121 and 121 adjacent to each other in the lateral direction) and the width of the ridges 121 (the ridges 121). It is a concept including the length in the direction orthogonal to the extending direction (vertical direction X) of 121 (horizontal direction Y) and the height of the convex portion 121, and among these three, the outer surface side 14a and the inner surface side 14b. If even one of them is different, the pattern of the ridge portion 121 will be different between the outer surface side 14a and the inner surface side 14b.
In the exterior body folded portion 14A, the three convex portions 121 on the inner surface side 14b correspond to the two convex portions 121 adjacent to each other in the lateral direction Y on the outer surface side 14a, and the inner surface side 14b However, the width of the convex portion 121 is short. Further, the height of the ridge portion 121 is lower on the inner surface side 14b. In the exterior body folded-back portion 14A, the convex portion 121 is smaller on the inner surface side 14b, which is a portion that can come into contact with the wearer's skin of the pants-type absorbent article, as compared with the outer surface side 14a. The smaller the strip 121, the easier it is for the composite stretchable portion 10E to become flat, so that the inner surface side 14b can come into contact with the wearer's skin in a flat state with less unevenness. As a result, the rubbing of the wearer's skin by the outer body folded portion 14A and the skin trouble caused by the rubbing can be reduced.
It should be noted that the present invention includes a form in which the convex portion 121 is larger on the inner surface side 14b than on the outer surface side 14a, contrary to the outer body folded portion 14A. As a merit of such a form, the wearer The point is that the air permeability of the inner surface side 14b close to the skin is improved.
The patterns (pitch, width, height) of the ridges 121 are the types and arrangements of the stretchable members (stretchable sheets, elastic members, etc.) included in the composite stretchable portion 10E, and the stacked sheets 12 constituting the composite stretchable portion 10E. Since it is determined by the pattern of the joints 13 between the 13s (the distance between the joints, the length of the lateral Y of the joints), etc., by making these different on the outer surface side 14a and the inner surface side 14b, the convex stripes of both It is possible to make the patterns of the portions 121 different from each other.

The pants-type absorbent article of the present invention is applicable not only to disposable diapers but also to general absorbent articles having a pants-type structure such as disposable shorts and shorts-type napkins, and even those for infants are adults. It may be for.

Although the present invention has been described above based on the embodiment, the present invention can be appropriately modified without being limited to the embodiment.
For example, in the diaper 1, as shown in FIG. 2, the exterior body 10 has a continuous shape extending over the ventral side A, the inseam B, and the dorsal side C, but instead, the exterior body 10 has a continuous shape. It is a form divided into a ventral seat member and a dorsal seat member, and the absorbent main body 2 may be bridged and fixed to both seat members.
Moreover, all the portions having only one embodiment described above can be mutually used as appropriate. Further, the following additional notes will be disclosed with respect to the above-described embodiment of the present invention.

<1>
It has a vertical direction extending from the ventral side of the wearer to the dorsal side through the crotch part and a lateral direction orthogonal to the vertical direction, and the crotch part arranged in the crotch part of the wearer and the crotch part worn more than the crotch part. It is divided into a ventral part arranged on the ventral side of the person and a dorsal part arranged on the dorsal side of the wearer rather than the inseam. Equipped with an exterior body arranged on the side facing the skin,
A pair of side seals, a waist opening, and a pair of leg openings are formed by joining both side edges of the exterior body of the ventral portion and the dorsal portion along the vertical direction. It is a pants-type absorbent article,
The exterior body includes an outer layer sheet arranged at a position relatively far from the absorber and an inner layer sheet arranged at a position relatively close to the absorber.
At least a part of the exterior body is a composite expansion / contraction portion having elasticity in the lateral direction, and in the composite expansion / contraction portion, a plurality of outer layer sheets and inner layer sheets are intermittently arranged in the lateral direction. It is joined at the joint,
In the composite stretchable portion in a natural state, the inner layer sheet has a plurality of concave portions having the joint portion at the bottom and extending in the vertical direction, and is located between the concave portions and has a bent portion of the inner layer sheet at the top. The outer layer sheet has a fold structure including the ridges thereof, and the outer layer sheet has a plurality of bent portions in a region overlapping the ridges of the inner layer sheet in a plan view.
A pants-type absorbent article provided with an exterior body folded portion including a portion in which the composite stretchable portion is folded back with the inner layer sheet inside, on at least one of the ventral side portion and the dorsal side portion.
<2>
The pants-type absorbent article according to <1>, wherein in the composite stretchable portion in a natural state, there are 2 or more and 10 or less, preferably 2 or more and 5 or less of the bent portions between the adjacent joint portions. ..
<3>
The pants-type absorbent article according to <2>, wherein the distance between the adjacent joints is 2 mm or more and 15 mm or less, preferably 3 mm or more and 10 mm or less.
<4>
The pants-type absorbent article according to any one of claims <1> to <3>, wherein the outer body folded portion is arranged in a waist region including a vertical end of the pants-type absorbent article.
<5>
The pants-type absorption according to any one of claims <1> to <4>, wherein the outer layer sheet has a higher rate of decrease in thickness than the inner layer sheet when the composite elastic portion is compressed in the thickness direction. Sex goods.
<6>
The pants-type absorbent article according to any one of claims <1> to <5>, wherein the outer layer sheet has elasticity in the lateral direction and the inner layer sheet does not have elasticity.
<7>
The pants-type absorbent article according to any one of claims <1> to <6>, wherein the joint portion is a fused portion between the outer layer sheet and the inner layer sheet.
<8>
The pants-type absorbent article according to any one of claims <1> to <7>, wherein the inner layer sheet has higher rigidity than the outer layer sheet.
<9>
The pants-type absorbent article according to <8>, wherein the ratio of the rigidity of the inner layer sheet to the rigidity of the outer layer sheet is 1.1 or more and 3.0 or less, preferably 1.2 or more and 2.0 or less.
<10>
The composite elastic member includes, as an elastic member for imparting elasticity to the composite elastic member, an elastic member arranged so as to be stretchable in the lateral direction between the outer layer sheet and the inner layer sheet. The pants-type absorbent article according to any one of <9>.
<11>
At least one of the ventral and dorsal portions, the longitudinal end of the absorber is located inward in the longitudinal direction from the longitudinal end of the pants-type absorbent article and at both longitudinal ends. The sandwiched area is the absorber non-placement area,
The portion of the composite stretchable portion located in the absorber non-arranged region is compared with the portion of the composite stretchable portion located in the absorber arranged region adjacent to the absorber non-arranged region in the vertical direction. The pants-type absorbent article according to any one of <1> to <10>, wherein the stretchable member that imparts elasticity to the portion has a low elongation ratio.
<12>
The pants-type absorption according to <11>, wherein the portion of the composite stretchable portion located in the absorber non-placement region has a lower elongation stress than the portion of the composite stretchable portion located in the absorber placement region. Sex goods.
<13>
The absorber non-placement region includes a waist region corresponding to the wearer's waist circumference, and the absorber placement region includes an iliac region corresponding to a site from the wearer's iliac crest to the anterior superior iliac spine. The pants-type absorbent article according to <11> or <12>, which comprises.
<14>
In the folded portion of the exterior body, the pattern of the ridge portion is different between the composite stretchable portion located on the outer side in the thickness direction and the folded composite stretchable portion located on the inner side in the thickness direction. The pants-type absorbent article according to any one of <1> to <13>.
<15>
In the folded portion of the exterior body, the concave portion of the composite elastic portion located on the outer side in the thickness direction and the concave portion of the folded composite elastic portion located on the inner side in the thickness direction are formed. The pants-type absorbent article according to any one of <1> to <14>, which are opposed to each other.
<16>
In the folded portion of the exterior body, the ridge portion of the composite stretchable portion located on the outer side in the thickness direction and the ridge portion of the folded composite stretchable portion located on the inner side in the thickness direction are formed. The pants-type absorbent article according to any one of <1> to <15>, which are opposed to each other.
<17>
The pants-type absorption according to <16>, wherein in the folded portion of the exterior body, the ridge portion of one of the composite stretchable portions facing each other and the ridge portion of the other composite stretchable portion are adhered to each other. Sex goods.
<18>
The pants-type absorbent article according to <17>, wherein the adhesive portions of the convex portions facing each other extend in the vertical direction.
<19>
The pants-type absorbent article according to any one of <1> to <18>, wherein the joint portion extends in the vertical direction.
<20>
The pants type according to any one of <1> to <19>, wherein the outer layer sheet has a basis weight of 20 g / m ² or more and 60 g / m ² or less, preferably 30 g / m ² or more and 55 g / m ² or less. Absorbent article.
<21>
The pants type according to any one of <1> to <20>, wherein the inner layer sheet has a basis weight of 13 g / m ² or more and 30 g / m ² or less, preferably 15 g / m ² or more and 25 g / m ² or less. Absorbent article.

According to the present invention, there is provided a pants-type absorbent article having an exterior body having excellent cushioning and breathability, which makes it difficult for a wearer who has a lot of sleeping postures to have a pressing mark on the skin and which is hard to get stuffy.

Claims (21)

1. It has a vertical direction extending from the ventral side of the wearer to the dorsal side through the crotch part and a lateral direction orthogonal to the vertical direction, and the crotch part arranged in the crotch part of the wearer and the crotch part worn more than the crotch part. It is divided into a ventral part arranged on the ventral side of the person and a dorsal part arranged on the dorsal side of the wearer rather than the inseam. Equipped with an exterior body arranged on the side facing the skin,
   A pants-type absorbent article in which a waist opening and a pair of leg openings are formed by joining both side edges of the exterior body of the ventral portion and the dorsal portion along the vertical direction. There,
   The exterior body includes an outer layer sheet arranged at a position relatively far from the absorber and an inner layer sheet arranged at a position relatively close to the absorber.
   At least a part of the exterior body is a composite expansion / contraction portion having elasticity in the lateral direction, and in the composite expansion / contraction portion, a plurality of outer layer sheets and inner layer sheets are intermittently arranged in the lateral direction. It is joined at the joint,
   In the composite stretchable portion in a natural state, the inner layer sheet has a plurality of concave portions having the joint portion at the bottom and extending in the vertical direction, and the bent portion of the inner layer sheet located between the concave portions. The outer layer sheet has a fold structure including a ridge portion as a top portion, and the outer layer sheet has a plurality of bent portions in a region overlapping one of the ridge portions of the inner layer sheet in a plan view.
   A pants-type absorbent article provided with an exterior body folded portion including a portion in which the composite stretchable portion is folded back with the inner layer sheet inside, on at least one of the ventral side portion and the dorsal side portion.
2. The pants-type absorbent article according to claim 1, wherein the composite stretchable portion in a natural state has two or more and ten or less bent portions between the adjacent joint portions.
3. The pants-type absorbent article according to claim 2, wherein the distance between the adjacent joints is 2 mm or more and 15 mm or less.
4. The pants-type absorbent article according to any one of claims 1 to 3, wherein the outer body folded portion is arranged in a waist region including a vertical end of the pants-type absorbent article.
5. The pants-type absorbent article according to any one of claims 1 to 4, wherein when the composite elastic portion is compressed in the thickness direction, the outer layer sheet has a higher rate of decrease in thickness than the inner layer sheet.
6. The pants-type absorbent article according to any one of claims 1 to 5, wherein the outer layer sheet has elasticity in the lateral direction, and the inner layer sheet does not have elasticity.
7. The pants-type absorbent article according to any one of claims 1 to 6, wherein the joint portion is a fusion portion between the outer layer sheet and the inner layer sheet.
8. The pants-type absorbent article according to any one of claims 1 to 7, wherein the inner layer sheet has higher rigidity than the outer layer sheet.
9. The pants-type absorbent article according to claim 8, wherein the ratio of the rigidity of the inner layer sheet to the rigidity of the outer layer sheet is 1.1 or more and 3.0 or less.
10. The composite stretchable portion includes, as a stretchable member for imparting elasticity to the composite stretchable portion, an elastic member arranged so as to be stretchable in the lateral direction between the outer layer sheet and the inner layer sheet. The pants-type absorbent article according to any one of 9.
11. At least one of the ventral and dorsal portions, the longitudinal end of the absorber is located inward in the longitudinal direction from the longitudinal end of the pants-type absorbent article and at both longitudinal ends. The sandwiched area is the absorber non-placement area,
    The portion of the composite stretchable portion located in the absorber non-arranged region is compared with the portion of the composite stretchable portion located in the absorber arranged region adjacent to the absorber non-arranged region in the vertical direction. The pants-type absorbent article according to any one of claims 1 to 10, wherein the stretchable member that imparts elasticity to the portion has a low elongation ratio.
12. The pants-type absorbent according to claim 11, wherein the portion of the composite stretchable portion located in the absorber non-arranged region has a lower elongation stress than the portion of the composite stretchable portion located in the absorber arranged region. Goods.
13. The absorber non-placement region includes a waist region corresponding to the wearer's waist circumference, and the absorber placement region includes an iliac region corresponding to a site from the wearer's iliac crest to the anterior superior iliac spine. The pants-type absorbent article according to claim 11 or 12, which comprises.
14. In the folded portion of the exterior body, the pattern of the ridge portion is different between the composite stretchable portion located on the outer side in the thickness direction and the folded composite stretchable portion located on the inner side in the thickness direction. The pants-type absorbent article according to any one of claims 1 to 13.
15. In the folded portion of the exterior body, the concave portion of the composite elastic portion located on the outer side in the thickness direction and the concave portion of the folded composite elastic portion located on the inner side in the thickness direction are formed. The pants-type absorbent article according to any one of claims 1 to 14, which are opposed to each other.
16. In the folded portion of the exterior body, the ridge portion of the composite stretchable portion located on the outer side in the thickness direction and the ridge portion of the folded composite stretchable portion located on the inner side in the thickness direction are formed. The pants-type absorbent article according to any one of claims 1 to 15, which are opposed to each other.
17. The pants-type absorbent according to claim 16, wherein in the folded portion of the exterior body, the ridge portion of one of the composite stretchable portions facing each other and the ridge portion of the other composite stretchable portion are adhered to each other. Goods.
18. The pants-type absorbent article according to claim 17, wherein the adhesive portions of the convex portions facing each other extend in the vertical direction.
19. The pants-type absorbent article according to any one of claims 1 to 18, wherein the joint portion extends in the vertical direction.
20. The pants-type absorbent article according to any one of claims 1 to 19, wherein the outer layer sheet has a basis weight of 20 g / m ² or more and 60 g / m ² or less.
21. The pants-type absorbent article according to any one of claims 1 to 20, wherein the inner layer sheet has a basis weight of 13 g / m ² or more and 30 g / m ² or less.

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