JP2022044233A - Underpants type absorbent article - Google Patents

Abstract

To provide an underpants type absorbent article that is excellent in fitness and appearance.SOLUTION: An abdomen side exterior body 4A and a back side exterior body 4C include a lateral direction expansion/contraction part 6 that includes a lateral direction expansion/contraction sheet member 5 and expands/contracts in a lateral direction Y. A crotch exterior body 4B includes a longitudinal direction expansion/contraction part 8 that includes a longitudinal direction expansion/contraction sheet member 7 and expands/contracts in a longitudinal direction X. An absorber 23 overlaps with the crotch exterior body 4B. When an underpants type absorbent article 1 is in a spread and stretched state, a longitudinal direction length 7L of the longitudinal direction expansion/contraction sheet member 7 constituting the crotch exterior body 4B is equal to a longitudinal direction length 23L of the absorber 23 or longer than the longitudinal direction length 23L.SELECTED DRAWING: Figure 2

Description

The present invention relates to an absorbent article in the shape of a pants.

The pants-type absorbent article typically has a pants shape and is arranged at a position corresponding to the outer body forming the outer surface of the absorbent article and the wearer's crotch portion in the outer body to absorb body fluids. It is configured to include an absorbent body including an absorber to be retained. Further, in the pants-type absorbent article, in order to improve the fit to the wearer's skin, the waist circumference arranged around the wearer's torso and the leg circumference arranged around the wearer's legs, etc. , It is common to impart elasticity by arranging elastic members such as rubber threads. In Patent Documents 1 to 3, as a pants-type disposable diaper, the portion constituting the waist circumference portion of the exterior body expands and contracts in the horizontal direction, and the portion constituting the leg circumference portion of the exterior body expands and contracts in the vertical direction. Is described. The vertical direction corresponds to the front-back direction of the wearer of the absorbent article, and the horizontal direction is a direction orthogonal to the vertical direction.

Japanese Unexamined Patent Publication No. 2019-118554 Japanese Unexamined Patent Publication No. 2016-67511 International Publication No. 2013/077360

The conventional pants-type absorbent article has room for improvement in terms of the fit to the wearer's skin, especially the fit of the absorber. In recent years, pants-type absorbent articles intended for adult wearers, such as sanitary shorts and pants-type disposable diapers for adults, have been added to the basic performance of absorbent articles such as fit. It is required to have an appearance like underwear, and specifically, for example, it is required to have a texture like cloth, and to look compact when placed flat. Pants-type absorbent articles that have an excellent fit and an appearance like underwear have not yet been provided.

Therefore, an object of the present invention relates to providing a pants-type absorbent article having excellent fit and appearance.

The present invention has a vertical direction extending from the ventral side of the wearer to the dorsal side via the crotch portion and a lateral direction orthogonal to the vertical direction, and the crotch portion arranged in the crotch portion and the crotch portion. It is divided into a ventral part arranged on the ventral side of the wearer and a dorsal part arranged on the dorsal side of the wearer rather than the crotch part, and an absorbent body including an absorber that absorbs and retains body fluid. It is provided with an exterior body arranged on the non-skin facing surface side of the absorbent body, and both side edges of the exterior body along the vertical direction on each of the ventral side portion and the dorsal side portion are joined to each other. A pants-type absorbent article in which a waist opening and a pair of leg openings are formed.
In one embodiment of the pants-type absorbent article of the present invention, the exterior body comprises a ventral exterior body constituting the ventral side portion, a dorsal exterior body constituting the dorsal side portion, and the inseam portion. It has an inseam exterior body.
In one embodiment of the pants-type absorbent article of the present invention, the ventral exterior body and the dorsal exterior body each include the laterally stretchable sheet member having elasticity in the lateral direction, and the laterally stretchable sheet member, respectively. It has a lateral expansion and contraction part that expands and contracts.
In one embodiment of the pants-type absorbent article of the present invention, the inseam exterior body includes the vertical stretchable sheet member having the vertical stretchability, and has the vertical stretchable portion that stretches in the vertical direction. ing.
In one embodiment of the pants-type absorbent article of the present invention, the absorber overlaps with the inseam exterior body, and in the deployed and extended state of the pants-type absorbent article, the inseam exterior body constitutes the vertical expansion and contraction. The vertical length of the sheet member is the same as the vertical length of the absorber, or is longer than the vertical length of the absorber.
Other features, effects and embodiments of the invention are described below.

INDUSTRIAL APPLICABILITY According to the present invention, a pants-type absorbent article having excellent fit and appearance is provided.

FIG. 1 is a schematic perspective view of a pants-type disposable diaper according to an embodiment of the pants-type absorbent article of the present invention. FIG. 2 is a developed plan view schematically showing a skin-facing surface (arrangement side of the absorbent body) in the unfolded and stretched state of the diaper shown in FIG. FIG. 3 is a cross-sectional view of the diaper shown in FIG. 1 along the thickness direction of FIG. 2 along the line I-I, and is a schematic cross-sectional view of the inseam of the diaper shown in FIG. FIG. 4 is a schematic exploded perspective view of the diaper shown in FIG. FIG. 5 is a perspective view schematically showing an embodiment of a laterally stretchable sheet member and / or a sheet material that can be used as a laterally stretchable portion according to the present invention, partially broken. FIG. 6 is a schematic perspective view of sanitary shorts, which is another embodiment of the pants-type absorbent article of the present invention.

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.

1 to 4 show a pants-type disposable diaper 1 which is an embodiment of the pants-type absorbent article of the present invention. The diaper 1 has a vertical direction X corresponding to the front-back direction of the wearer, that is, a direction extending from the ventral side to the dorsal side through the crotch portion, and a horizontal direction Y orthogonal to the vertical direction X. The diaper 1 has a crotch part B arranged in the crotch part of the wearer, a ventral side part A arranged on the ventral side (anterior side) of the wearer rather than the crotch part B, and a wearer's back rather than the crotch part B. It is divided into three parts, the dorsal side C arranged on the side (rear side). The diaper 1 includes an absorbent main body 2 including an absorbent body 23 that absorbs and holds body fluid, and an outer body 4 arranged on the non-skin facing surface side of the absorbent main body 2, and has a ventral side portion A and a dorsal side portion. Both side edges of the exterior body 4 along the vertical direction X in each of C are joined to each other to form a waist opening WH and a pair of leg openings LH and LH.

As shown in FIG. 2, the diaper 1 is formed symmetrically on one side and the other side with the horizontal center line CLi in between. The ventral part A is a part of the front body F of the diaper 1, and the dorsal part C is a part of the back body R of the diaper 1. 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 horizontal center line CLy is a virtual straight line extending in the vertical direction X by bisecting the expanded and extended diaper 1 in the horizontal direction Y as shown in FIG. The vertical center line CLx is a virtual straight line that bisects the expanded and extended diaper 1 in the vertical direction X and extends in the horizontal direction Y.
The "expanded and extended state" means that the diaper 1 is separated by the side joint S to be in the expanded state, and the elastic member of each part of the expanded state of the diaper 1 is extended to eliminate the influence of the elastic member. It refers to the state in which it is expanded to the size) when it is expanded in a flat state.

The ventral portion A and the dorsal portion C each have a waist circumference portion arranged around the torso of the wearer, and the waist circumference portion is a first region including the longitudinal end 1E of the diaper 1 and its vicinity. It has a second region D2 composed of a portion D1 and a portion other than the first region D1 (a portion closer to the lower crotch B in the waist circumference portion). The vertical end 1E of the diaper 1 is the vertical end of the exterior body 4, and is also the opening peripheral edge of the waist opening WH. The waist circumference portion is typically a region at the same position in the vertical direction X as the side joint portion S, that is, a region extending from the vertical end 1E of the diaper 1 to the lower end Sb of the side joint portion S, and is the present embodiment. Then, as shown in FIG. 2, it has a rectangular shape in a plan view. The first region D1 is a so-called waist end including the opening peripheral edge of the waist opening WH, and typically, in the expanded and extended state of the diaper 1 as shown in FIG. 2, the vertical end 1E of the diaper 1 It is a region extending from 3 to 7% of the total length of the vertical direction X of the diaper 1 on the inner side (vertical center line CLx side) of the vertical direction X.
The inseam B includes an excretion portion facing portion (not shown) facing the excretion portion such as the wearer's penis, and typically, the portion of the diaper 1 having the shortest lateral Y length (width) (not shown). The narrowest part) is included.
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 the present embodiment, as shown in FIG. 2, the absorbent main body 2 is arranged at least in the inseam B at the central portion of the diaper 1 (exterior body 4) in the lateral direction Y. The absorbent main body 2 has a rectangular shape in a plan view, and the longitudinal direction of the absorbent main body 2 coincides with the vertical direction X of the diaper 1.
As shown in FIG. 3, the absorbent body 2 is a liquid-permeable surface sheet 21 arranged at a position relatively close to the wearer's skin, and a protective body 2 arranged at a position relatively far from the wearer's skin. It is configured to include a leakable (liquid impermeable, impermeable or water repellent) back surface sheet 22 and an absorber 23 interposed between both sheets 21 and 22. The contour of the absorbent body 2 in a plan view substantially coincides with the contour of the absorbent body 23.
The absorber 23 includes an absorbent core 24 capable of absorbing and holding body fluid, and a core wrap sheet 25 covering an outer surface of the absorbent core 24 including a skin facing surface and a non-skin facing surface. These members constituting the absorbent main body 2 are integrated by a known joining means such as an adhesive. The absorber 23 does not include the core wrap sheet 25 and may be composed of the absorbent core 24.
As the above-mentioned members constituting the absorbent main body 2, those usually used in this kind of absorbent article can be used without particular limitation. For example, various non-woven fabrics, perforated films and the like can be used as the front surface sheet 21, and a resin film or a laminate of a resin film and a non-woven fabric or the like can be used as the back surface sheet 22. The absorbent core 24 is typically mainly composed of a water-absorbent material, and contains one or more selected from a fiber material such as wood pulp and a water-absorbent polymer as the water-absorbent material. The core wrap sheet 25 has liquid permeability and is typically made of paper, non-woven fabric or the like.

In the present specification, the "skin facing surface" is a surface of the absorbent article or a component thereof (for example, an absorbent body) that is directed toward the wearer's skin when the absorbent article is worn, that is, relative to the wearer's skin. 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.

A pair of leak-proof cuffs 3 and 3 that stand up on the wearer's skin side when the diaper 1 is worn are provided on both sides of the absorbent body 2 along the vertical direction X. Each leak-proof cuff 3 includes a liquid-resistant or water-repellent and breathable leak-proof sheet 30, in which one end side in the lateral direction Y is another member (absorbent body 2 in the illustrated form). And the fixed end portion fixed to the exterior body 4), and the other end side in the lateral direction Y is a free end portion which is not fixed to other members. An elastic member 31 for forming a leak-proof cuff is fixed at the free end of the leak-proof sheet 30 in an extended state in the vertical direction X so as to be expandable and contractible in the same direction. When wearing the diaper 1, the contraction force of the elastic member 31 causes the free end side of the leak-proof sheet 30 to stand up on the wearer side with the fixed end as the standing base end, at least in the inseam B. The leak-proof cuffs 3 and 3 stand up to prevent the outflow of excrement such as urine to the outside in the lateral direction Y.

The exterior body 4 has a ventral exterior body 4A constituting the ventral side portion A, a dorsal exterior body 4C constituting the dorsal side portion C, and an inseam exterior body 4B constituting the inseam lower portion B.
In the present embodiment, these plurality of exterior bodies 4A to 4C are connected to each other in the vertical direction X to form an exterior body 4 having one continuous shape. The exterior body 4 has a larger area than the absorbent main body 2, and extends outward from the peripheral edge of the absorbent main body 2. In the plan view of the diaper 1 in the expanded and extended state as shown in FIG. 2, the outer body 4 has an hourglass shape as a whole of the outer body 4 in which the central portion in the vertical direction X including the inseam outer body 4B is constricted. There is. Both ends of the exterior body 4 in the vertical direction X including the ventral exterior body 4A and the dorsal exterior body 4C have a rectangular shape in a plan view of the diaper 1 in the expanded and extended state.

In the present embodiment, a pair of side joints S, which are joints between the side edge portions 4S along the vertical direction X of the ventral exterior body 4A and the dorsal exterior body 4C, are formed on both sides of the diaper 1 in the lateral direction Y. Has been done. The means for joining the exterior bodies 4 to each other in the side joint portion S is not particularly limited, and examples thereof include fusion, adhesive, sewing, etc., depending on the use of the pants-type absorbent article, the material of the exterior body 4, and the like. It can be selected arbitrarily. Typically, the means of joining the exterior bodies 4 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 4 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 4S of the ventral exterior body 4A and the dorsal exterior body 4C are joined by fusion, and as shown in FIG. 1, a peripheral portion is formed. It protrudes outward.

The ventral exterior body 4A and the dorsal exterior body 4C each include a lateral expansion / contraction sheet member 5 having elasticity in the lateral direction Y, and have a lateral expansion / contraction portion 6 that expands / contracts in the lateral direction Y.
In the present embodiment, the ventral exterior body 4A and the dorsal exterior body 4C have the same configuration. In the present specification, the description of one of the ventral exterior body 4A and the dorsal exterior body 4C also applies to the other unless otherwise specified.
The inseam exterior body 4B includes a vertical stretchable sheet member 7 having elasticity in the vertical direction X, and has a vertical stretchable portion 8 that stretches and contracts in the vertical direction X.

As used herein, the term "stretchable" means a property of being expandable in a predetermined direction and contracting when the extension is released.
The laterally stretchable sheet member 5 is expandable in the lateral direction Y and contracts when the extension is released. The lateral stretchable sheet member 5 does not have elasticity in the vertical direction X, or even if it has elasticity in the vertical direction X, the stretchability in the vertical direction X is the stretchability in the horizontal direction Y. Low compared to.
The vertically stretchable sheet member 7 can be extended in the vertical direction X and contracts when the extension is released. The vertical stretchable sheet member 7 does not have elasticity in the horizontal direction Y, or even if it has elasticity in the horizontal direction Y, the stretchability in the horizontal direction Y is the stretchability in the vertical direction X. Low compared to.

Regarding the presence or absence of elasticity of the sheet, the breaking elongation of the sheet measured by the following tensile test can be used as an index. The fracture elongation is the elongation rate when the sheet is extended to a length that cannot be extended in one direction (the length immediately before the material is broken), and is also called the maximum elongation. When the elongation at break exceeds 10%, it can be evaluated that the sheet has elasticity in the tensile direction (for example, vertical direction X or horizontal direction Y). When the elongation at break is 10% or less, the sheet does not have elasticity in the tensile direction and can be evaluated as non-stretchable.
The laterally stretchable sheet member 5 has a breaking elongation of more than 10% in the lateral direction Y, preferably 30% or more, and more preferably 50% or more. The upper limit of the breaking elongation in the lateral direction Y of the laterally stretchable sheet member 5 is not particularly limited, but is preferably 250% or less, more preferably 200% or less.
The vertical stretchable sheet member 7 has a breaking elongation of more than 10% in the vertical direction X, preferably 30% or more, and more preferably 50% or more. The upper limit of the breaking elongation in the vertical direction X of the vertical stretchable sheet member 7 is not particularly limited, but is preferably 150% or less, more preferably 100% or less.

<Measurement method of breaking elongation>
A rectangular shape in a plan view having a length of 15 cm in the longitudinal direction and a length of 5 cm in the lateral direction is cut out from the sheet to be evaluated and used as a measurement sample. The longitudinal direction of the measurement sample is the direction for evaluating the presence or absence of elasticity. For example, when evaluating whether or not the product has elasticity in the lateral direction Y, the lateral direction Y is set as the longitudinal direction of the measurement sample. Place the measurement sample between a pair of chucks of Tensilon Tensile Testing Machine Co., Ltd., manufactured by Shimadzu Corporation, product name "Shimadzu Precision Universal Testing Machine Autograph AG-X") so that the longitudinal direction of the measurement sample matches the tensile direction. set. Then, the measurement sample is stretched by increasing the distance between chucks at a constant speed (5 mm / sec), the distance between chucks when the measurement sample breaks is measured, and the break elongation of the measurement sample is measured by the following formula (1). Calculate the degree.
Elongation at break (%) = {(C1-C0) / C0} × 100 ... (1)
In the formula (1), "C1" refers to the distance between chucks at the time of breaking of the measurement sample, and "C0" indicates the distance between chucks before the start of extension of the measurement sample (initial distance between chucks).

In the present embodiment, in the ventral exterior body 4A and the dorsal exterior body 4C, the only sheet member having elasticity is the lateral telescopic sheet member 5, and the ventral exterior body 4A and the dorsal exterior body 4C are lateral, respectively. It is mainly composed of the directional telescopic sheet member 5. Further, the inseam exterior body 4B has only the vertical stretchable sheet member 7 as a sheet member having elasticity, and the inseam exterior body 4B is mainly composed of the vertical stretchable sheet member 7.
In the present embodiment, the ventral exterior body 4A and the dorsal exterior body 4C are non-woven leg cover sheet members 12 (see FIG. 2) that cover the elastic member 11 described later as sheet members other than the laterally stretchable sheet member 5. ), But the leg cover sheet member 12 is non-stretchable.

As shown in FIG. 2, the laterally stretchable sheet member 5 of each of the ventral exterior body 4A and the dorsal exterior body 4C and the vertically stretchable sheet member 7 of the inseam exterior body 4B are located at the ends thereof in the vertical direction X. The overlapping portions 9 are partially overlapped with each other, and are joined to each other by known joining means such as an adhesive and fusion.
In the present embodiment, the overlapping portion 9 extends in the vertical direction X from the lower end Sb of the side joint portion S toward the inner side (vertical center line CLx) of the vertical direction X, and is in the vertical direction with the side joint portion S. It does not overlap in X.
Further, in the present embodiment, in the overlapping portion 9, the laterally stretchable sheet member 5 is arranged on the non-skin facing surface side of the vertically stretchable sheet member 7. That is, in the overlapping portion 9, the vertical stretchable sheet member 7 constituting the inseam exterior body 4B is a absorbent main body as compared with the lateral stretchable sheet member 5 constituting the ventral exterior body 4A and the dorsal exterior body 4C. Close to the skin of the wearer of 2 or diaper 1. In the present invention, the form of the overlapping portion 9 is not particularly limited, and contrary to the present embodiment, the vertical stretchable sheet member 7 may be arranged on the non-skin facing surface side of the lateral stretchable sheet member 5. ..

In the present embodiment, as shown in FIG. 2, the ventral exterior body 4A and the dorsal exterior body 4C each include only the laterally stretchable sheet member 5 as the stretchable seat member (the first in the present embodiment). It has one region D1 and a second region D2), and a portion (overlapping portion 9) including both a laterally stretchable sheet member 5 and a vertically stretchable sheet member 7 as a sheet member having elasticity. The former is naturally a lateral stretchable portion 6, but the latter, that is, the overlapping portion 9 is also a lateral stretchable portion 6, so that the ventral exterior body 4A and the dorsal exterior body 4C are at least in plan view with the absorber 23. Except for the overlapping part, it expands and contracts laterally over the entire area.
Since the overlapping portion 9 can exhibit elasticity of all the sheet members 5 and 7 constituting the overlapping portion 9, it can be expanded and contracted in both the vertical direction X and the horizontal direction Y, and is the lateral expansion and contraction portion 6. It is also a vertical expansion / contraction portion 8.
Further, in the present embodiment, since the inseam exterior body 4B includes only the vertical stretchable sheet member 7 as a sheet member having elasticity, the entire area of the exterior body 4B is the vertical stretchable portion 8, and the entire area thereof is covered. It expands and contracts in the vertical direction X.
It should be noted that the above-mentioned "portion that overlaps with the absorber 23 in a plan view" is usually because the elastic sheet member (exterior body 4) is joined to the absorbent body 23 (absorbent body 2) having relatively high rigidity. , The elasticity of the sheet member may be hindered by the absorber 23 and may not be sufficiently exhibited. However, as will be described later, by devising the joining form of the two, it is possible to join the absorber 23 (absorbent main body 2) to the sheet member without impairing the elasticity of the sheet member, and in that case, The portion that overlaps with the absorber 23 in a plan view can exhibit the elasticity of the sheet member arranged in the portion, specifically, the laterally stretchable sheet member 5 and / or the vertically stretchable sheet member 7.

In the present invention, the position of the overlapping portion 9 is not particularly limited, and the overlapping portion 9 may be located at one or more of the ventral side portion A, the crotch portion B, and the dorsal side portion C. In the present invention, the ventral exterior body 4A may form a part of the crotch part B in addition to the ventral part A, and the inseam exterior body 4B may form the ventral part A and / or the crotch part A in addition to the crotch part B. Since the dorsal exterior body 4C may form a crotch lower portion B in addition to the dorsal side portion C in some cases, it may form a part of each of the dorsal side portions C. The overlapping portion 9, which is a portion where two adjacent parts in the vertical direction X overlap, is the portion of the vertical direction X of the diaper 1 excluding the end portion of the vertical direction X of the diaper 1 (the vertical end 1E and its vicinity). It can be set to any position.
In the form shown in FIG. 2, the overlapping portion 9 is located on the ventral side portion A and the dorsal side portion C, and is not located on the crotch portion B. In the present invention, in addition to the form shown in FIG. 2, for example, 1) the overlapping portion 9 is located only on the ventral side A, 2) the overlapping portion 9 is located only on the inseam B, and 3) the overlapping portion 9 is provided. There may be a form located only on the dorsal side C.
For example, in the form of 3) above, the ventral exterior body 4A constituting the ventral portion A and the inseam exterior body 4B constituting the inseam B are not independent members as in the form shown in FIG. The inseam exterior body 4B in the integrated body of the ventral exterior body 4A and the inseam exterior body 4B and the dorsal exterior body 4C constituting the back side portion C of a member different from the integrated body are integrated. , May be connected and configured via an overlapping portion 9 located on the dorsal side portion C.

In the present embodiment, as shown in FIGS. 2 and 4, the lateral telescopic sheet member 5 has the outer end side (the side relatively far from the vertical center line CLx) of the sheet member 5 in the vertical direction X. It is folded back in the vertical direction X by a folding curve (not shown) extending in the horizontal direction Y with the skin facing surface (arranged surface of the absorbent main body 2) inside, and has a folded portion 50. The folding curve is at the same position as the vertical end 1E of the diaper 1, and the folded portion 50 is from the vertical end 1E of the diaper 1 in the lateral expansion and contraction portions 6 of the ventral exterior body 4A and the dorsal exterior body 4C, respectively. It extends a predetermined distance toward the inward side of the vertical direction X. The folded-back portion 50 is joined to the laterally stretchable sheet member 5 facing the folded-back portion 50 by a joining means such as an adhesive or fusion. The folded portion 50 may be omitted.

In the present embodiment, a plurality of elastic members 10 extending in the lateral direction Y are intermittently arranged in the vertical direction X in the first region D1 of each of the ventral side portion A and the dorsal side portion C. The plurality of elastic members 10 are fixed in an extended state between the folded-back portion 50 and the laterally telescopic sheet member 5 facing the folded portion 50. In the natural state or the wearing state of the diaper 1, due to the contraction of the elastic member 10, a plurality of folds (gathers) extending in a direction intersecting the contraction direction of the elastic member 10 are formed on the laterally stretchable sheet member 5 constituting the first region D1. It is formed, thereby forming waist gathers in the first region D1 in which the folds are substantially continuous over the entire circumference of the diaper 1.
In the second region D2 of each of the ventral side portion A and the dorsal side portion C, a plurality of elastic members extending in the lateral direction Y may be intermittently arranged in the vertical direction X as in the first region D1.

In the present embodiment, a plurality of elastic members 11 are arranged at the opening edges of each of the pair of leg openings LH and LH. The plurality of elastic members 11 are non-stretchable and are arranged between the laterally stretchable sheet member 5 and the vertically stretchable sheet member 7 constituting the overlapping portion 9 and on the laterally stretchable sheet member 5 and the skin facing surface side thereof. It is fixed in an extended state between the leg cover sheet member 12 and the leg cover sheet member 12. As shown in FIG. 2, the leg cover sheet member 12 has a rectangular shape in a plan view, and extends along the entire length of the ventral side portion A or the dorsal side portion C (laterally stretchable portion 6) along the folded portion 50 in the lateral direction Y. It is postponed. In the natural state or the wearing state of the diaper 1, a plurality of sheet members 5, 7 and 12 constituting the opening edge of the leg opening LH extend in a direction intersecting the contraction direction of the elastic member 11 due to the contraction of the elastic member 11. The folds (gathers) are formed, thereby forming leg gathers in which the folds are substantially continuous over the entire circumference of the opening edge of the leg opening LH.

In the diaper 1, the absorbent body 23 overlaps the inseam exterior body 4B, and in the expanded and extended state of the diaper 1 as shown in FIG. 2, the vertical length 7L of the vertically elastic sheet member 7 constituting the inseam exterior body 4B is provided. , The same as the vertical length 23L of the absorber 23, or characterized by a longer point than the vertical length 23L. That is, one of the main features of the diaper 1 is that the magnitude relationship of "vertical length 7L of the vertical telescopic sheet member 7 ≥ vertical length 23L of the absorber 23" is established. In the present embodiment, as shown in FIG. 2, the magnitude relationship of "vertical length 7L of the vertical stretchable sheet member 7> vertical length 23L of the absorber 23" is established. The vertical length 7L is the vertical length of the vertical telescopic sheet member 7 including the overlapping portion 9.

In the conventional pants-type absorbent article, since the absorber is always sandwiched between the wearer's thighs when worn, it is easily compressed laterally by both thighs and contracts laterally. However, since the absorber is not devised to shrink in the vertical direction, the absorber substantially shrinks only in the horizontal direction Y. On the other hand, in the diaper 1 having the above-mentioned characteristics, since the vertical stretchable sheet member 7 that can be expanded and contracted in the vertical direction X overlaps with the absorber 23 and exists over the entire length of the absorber 23 in the vertical direction X, the diaper 1 has the same characteristics. When worn, the absorber 23 (absorbent body 2) can shrink not only in the horizontal direction Y but also in the vertical direction X, and can shrink uniformly in both directions X and Y. Therefore, according to the diaper 1, the absorbent body is applied to a part of the wearer's body where it is difficult to fit the absorbent body with the conventional pants-type absorbent article, for example, the buttocks and the inguinal region where the skin stretches and contracts relatively large. Since 23 (absorbent body 2) can be fitted, a good fit can be obtained and leakage of excrement can be effectively prevented. Further, in the natural state (non-wearing state) of the diaper 1, the absorbent body 23 (absorbent main body 2) can be contracted relatively compactly due to the action of the vertically elastic sheet member 7, so that the diaper 1 is placed flat, for example. Sometimes diaper 1 looks compact and easy to see. The diaper 1 having such a compact appearance can give the viewer the impression that the diaper 1 is like underwear.

From the viewpoint of ensuring that the above-mentioned action and effect are more reliably performed, it is preferable to set the dimensions and the like of each part of the diaper 1 as follows.
In the unfolded and stretched state of the diaper 1, the ratio of the vertical length 7L of the vertical stretchable sheet member 7 (see FIG. 2) to the vertical length 23L of the absorber 23 (see FIG. 2) is 7L ≧ 23L. As a premise, 7L / 23L is preferably 1 or more, more preferably 1.2 or more, and preferably 3.5 or less, more preferably 3 or less.
The vertical length 7L of the vertical stretchable sheet member 7 in the unfolded and stretched state of the diaper 1 is preferably 250 mm or more, more preferably 250 mm or more, on the premise that the vertical length 7L of the absorber 23 in the same state is 23L or more. It is 300 mm or more, preferably 650 mm or less, and more preferably 600 mm or less.
The vertical length 7L of the vertical stretchable sheet member 7 is the same as the length of the vertical stretchable portion 8 in the vertical direction X.
The vertical length 23L of the absorber 23 in the unfolded and extended state of the diaper 1 is preferably 200 mm or more, more preferably 200 mm or more, on the premise that the vertical length of the vertically elastic sheet member 7 in the same state is 7 L or less. It is 250 mm or more, preferably 600 mm or less, and more preferably 550 mm or less.

In the unfolded and stretched state of the diaper 1, the ratio of the vertical length 7L of the vertical stretchable sheet member 7 to the total length of the vertical X of the diaper 1 is preferably 30% or more, more preferably 40% or more, and It is preferably 90% or less, more preferably 80% or less.
In the unfolded and stretched state of the diaper 1, the ratio of the vertical length 23L of the absorber 23 to the total length of the vertical X of the diaper 1 is preferably 20% or more, more preferably 30% or more, and preferably. It is 90% or less, more preferably 80% or less.

The length 5L (see FIG. 2) of the laterally telescopic sheet member 5 of the ventral exterior body 4A or the dorsal exterior body 4C in the unfolded and extended state of the diaper 1 is preferably 200 mm or more, more preferably 250 mm or more. The thickness is preferably 400 mm or less, more preferably 350 mm or less. The vertical length 5L is the vertical length of the lateral telescopic sheet member 5 including the overlapping portion 9.
In the unfolded and extended state of the diaper 1, the ratio of the lateral length 5L of the lateral telescopic sheet member 5 of the ventral exterior body 4A or the dorsal exterior body 4C to the total length of the diaper 1 in the vertical direction X is preferable. It is 30% or more, more preferably 40% or more, and preferably 80% or less, more preferably 70% or less.
The vertical length 5L of the horizontal expansion / contraction sheet member 5 is the same as the length of the horizontal expansion / contraction portion 6 in the vertical direction X.
The vertical length 9L (see FIG. 2) of the overlapping portion 9 in the unfolded and extended state of the diaper 1 is preferably 20 mm or more, more preferably 30 mm or more, and preferably 110 mm or less, more preferably 100 mm or less.
In the unfolded and extended state of the diaper 1, the ratio of the vertical length 9L of one overlapping portion 9 to the total length of the vertical X of the diaper 1 is preferably 5% or more, more preferably 10% or more, and It is preferably 30% or less, more preferably 20% or less.

It is preferable that the lateral telescopic sheet member 5 constituting the ventral exterior body 4A and the dorsal exterior body 4C and the vertical telescopic sheet member 7 constituting the inseam exterior body 4B are of the same type. Since both the seat members 5 and 7 are the same type of seat members, the unified appearance of the diaper 1 is improved, and a good appearance closer to that of underwear can be obtained.
"The same type" here means that a) the manufacturing process of the seat member, b) the type / fiber diameter / fiber length of the constituent fibers of the seat member, and c) the thickness and basis weight of the seat member are all the same. Means. When at least one of the above a) to c) is different, the sheet members are "different in type". For example, in the lateral stretchable sheet member 5 and the vertical stretchable sheet member 7, the stretchable characteristics (stretching direction, elongation rate, stretching stress, etc.), color, presence / absence of a pattern, presence / absence of placement of elastic members, placement pattern of elastic members, etc. Even if the above-mentioned a) to c) are all the same, the types of both seat members 5 and 7 are the same.

Similarly, from the viewpoint of improving the unified appearance of the diaper 1, when there are a plurality of overlapping portions 9 of the laterally stretchable sheet member 5 and the vertically stretchable sheet member 7, as in the present embodiment, the plurality of overlapping portions 9 are present. It is preferable that the parts 9 have the same joining pattern of both sheet members 5 and 7. The term "same joining pattern" as used herein means that the joint portions of both sheet members 5 and 7 have the same plan-view shape and arrangement. The "joining portion" is, for example, an adhesive coating portion when the joining means of both sheet members 5 and 7 is an adhesive, and the joining means is fused by heat fusion treatment, ultrasonic fusion treatment, or the like. In the case of, it is a fusion part.

The above-mentioned "same shape of joints in plan view" includes not only the case where the joint portions to be contrasted have the same dimensional relationship in plan view but also the case where they have a similar relationship. Therefore, for example, the joint portion of one of the overlapping portions 9 is the coating portion of the plan-view spiral adhesive, and the joint portion of the other overlap portion 9 is the joint portion of the plan-view spiral adhesive having a different diameter. In the case of the coated portion, the one overlapping portion 9 and the other overlapping portion 9 have "the same planological shape of the joint portion".
Further, the above-mentioned "same arrangement of joints" means that, for example, when a plurality of joints are arranged in a staggered pattern, the plurality of joints have a certain regularity and are scattered. When arranged, it means that the regularity is the same. Therefore, for example, if the regularity of the plurality of joints of both sheet members 5 and 7 is the same between the one overlapping portion 9 and the other overlapping portion 9, the spacing (pitch) between the plurality of joints is different. Even so, the one overlapping portion 9 and the other overlapping portion 9 have "the same arrangement of joints".

In the diaper 1, the magnitude of "extension stress in the lateral direction Y of the first region D1> extension stress in the lateral direction Y of the second region D2> extension stress in the longitudinal direction X of the inseam B (longitudinal expansion and contraction portion 8)". It is preferable that the relationship is established.
In each of the ventral portion A and the dorsal portion C, the magnitude relationship of "extension stress in the lateral direction Y of the first region D1> extension stress in the lateral direction Y of the second region D2" is established, and "ventral portion A" is established. It is particularly preferable that the magnitude relationship of "extension stress in the lateral direction Y of the second region D2 of each of the dorsal side portion C> extension stress in the longitudinal direction X of the crotch portion B (longitudinal expansion and contraction portion 8)" is established.
The elongation stress in the lateral direction Y correlates with the degree of tightening (fitness) of the diaper 1 to the wearer, and the larger the extension stress in the lateral direction Y, the stronger the tightening. The magnitude relationship is established, and the extension stress in the lateral direction Y of the first region D1, which is the so-called waist end, is set to be relatively large, so that the inconvenience that the diaper 1 slips off during wearing is effectively prevented. obtain. Further, the lower crotch B (longitudinal expansion / contraction portion 8) is an arrangement portion of the absorber 23 that absorbs and holds excrement, and is absorbed in order to secure the absorption performance of the absorber 23 and obtain a predetermined leakage-proof performance. It is important to fit the body 23 to the wearer's crotch without over-tightening, and as an index of the function of such inseam B (longitudinal stretchable portion 8), lateral Y extension stress Since the extensional stress in the vertical direction X is more appropriate than that, the extensional stress in the vertical direction X of the inseam B (longitudinal expansion and contraction portion 8) is the first region D1 and the extension stress as in the magnitude relationship. It is preferable that the extension stress in the lateral direction Y of the second region D2 (lateral expansion / contraction portion 6) is smaller than that of the extension stress. Further, the second region D2 includes a portion arranged on the lower abdomen of the wearer, and the lower abdomen is a delicate portion as compared with the waist circumference of the wearer on which the first region D1 is arranged. The lateral extension stress of the two regions D2 is preferably such that the second region D2 can flexibly fit the lower abdomen, and specifically, as in the magnitude relationship, the lateral direction of the first region D1. It is preferable that the strength is about halfway between the elongation stress of Y and the elongation stress of the crotch portion B (longitudinal expansion and contraction portion 8) in the longitudinal direction X. The elongation stress is measured by the following method.
For the elongation stress, the type of sheet member constituting the site (first region D1, second region D2, inseam B), the type, thickness, number, pitch, etc. of the elastic member arranged in the site are appropriately adjusted. It can be adjusted by doing.

<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 4 joined by the side joints S are peeled off, the diaper 1 is unfolded and spread in a plane, and the stretching stress measurement target sites (first region D1, second region D2, inseam B). Is cut out over the entire area of the site and used as a measurement sample. When cutting out from the diaper 1, all the constituent members of the diaper 1 existing in the cut-out portion are included. Therefore, for example, when the absorbent main body 2 is present in the cutout portion in addition to the outer body 4, the outer body 4 and the absorbent main body 2 are cut out so as to be included. Shimadzu Co., Ltd. Tensile Testing Machine Co., Ltd. It is sandwiched between a pair of chucks manufactured by Shimadzu Corporation, product name "Shimadzu Precision Universal Testing Machine Autograph AG-X"). The distance between the chucks at this time is 10 mm. Next, the measurement sample is stretched by increasing the distance between the chucks at a constant speed (5 mm / sec), and the tensile load when stretched to a predetermined length is measured. Specifically, when the length of the measurement sample in the expansion / contraction direction when the measurement sample is stretched to the design dimension is 100 (for example, 350 mm), the measurement sample is equivalent to 80 from the natural state (non-stretched state). After extending to a length of (for example, 280 mm), the tensile load (cN / 10 mm) when contracted to a length equivalent to 71 (for example, 250 mm) is measured. The expansion and contraction of the measurement sample performed when measuring the tensile load was determined in consideration of the typical usage mode when wearing this type of pants-type absorbent article. Such measurement is repeated three times, and the average of these is taken as the elongation stress (cN / 10 mm) of the measurement target site corresponding to the measurement sample.

The ratio of the lateral extension stress of the first region D1 to the lateral extension stress of the second region D2 is such that the first region D1> the second region D2 is assumed, and the first region D1 / second region D2. It is preferably 2.0 or more, more preferably 2.5 or more, and preferably 4.5 or less, more preferably 4.0 or less.
The ratio of the extension stress in the lateral direction Y of the second region D2 to the extension stress in the vertical direction X of the inseam B (vertical expansion and contraction portion 8) is such that the second region D2> the inseam B (longitudinal expansion and contraction portion 8). As a premise, the second region D2 / inseam B (longitudinal stretchable portion 8) is preferably 1.1 or more, more preferably 1.5 or more, and preferably 3.0 or less, more preferably 2.5. It is as follows.

The elongation stress in the lateral direction Y of the first region D1 is preferably 10 cN / 10 mm or more, more preferably 15 cN / 10 mm or more, and preferably 30 cN / 10 mm or less, more preferably 30 cN / 10 mm or less, on the premise that the magnitude relationship is established. Is 25 cN / 10 mm or less.
The elongation stress in the lateral direction Y of the second region D2 is preferably 5 cN / 10 mm or more, more preferably 5.5 cN / 10 mm or more, and preferably 10 cN / 10 mm or less, on the premise that the magnitude relationship is established. It is preferably 9 cN / 10 mm or less.
The elongation stress in the vertical direction X of the inseam B (longitudinal expansion and contraction portion 8) is preferably 2 cN / 10 mm or more, more preferably 2.5 cN / 10 mm or more, and preferably 2.5 cN / 10 mm or more, on the premise that the magnitude relationship is established. Is 5 cN / 10 mm or less, more preferably 4.5 cN / 10 mm or less.

In the present embodiment, the absorbent main body 2 and the exterior body 4 (more specifically, the vertically stretchable sheet member 7) are joined by a known joining means such as an adhesive or fusion, and both members 2 are joined. , 4 are preferably joined intermittently in the vertical direction X. With such a configuration, it is possible to prevent the inconvenience that the elasticity of the portion of the exterior body 4 that overlaps with the absorbent body 2 in a plan view is hindered by the absorbent body 23 included in the absorbent body 2. As an example of the joint form between the absorbent main body 2 and the exterior body 4, there is a form in which the joint portions of both members 2 and 4 are intermittently arranged in the vertical direction X. Specifically, for example, the absorbent main body 2 is joined to the exterior body 4 (longitudinal telescopic sheet member 7) at both ends in the vertical direction X, and is joined to the exterior body 4 at the portions sandwiched between the both ends. There is no form.

The diaper 1 has a buttock-corresponding portion arranged on the wearer's buttocks, and the laterally stretchable sheet member 5 and the vertically stretchable sheet member 7 overlap each other in the buttock-corresponding portion, that is, at least the buttock portion. It is preferable that the overlapping portion 9 is present in the corresponding portion. With such a configuration, the fit of the part of the body of the wearer of the diaper 1 from the buttocks to the dorsal side is further improved, and when the diaper 1 is worn, outer clothing such as trousers is layered on the diaper 1. In some cases, it becomes difficult to confirm the presence of the diaper 1 through the outer clothing, so that the appearance when worn can be further improved.
The "buttock-corresponding portion" is typically a region sandwiched between the lower end Sb of the side joint S on the ventral side A side and the lower end Sb of the side joint S on the dorsal side C side. In the embodiment, as shown in FIG. 2, the overlapping portion 9 exists in the region (buttock corresponding portion). The buttock-corresponding portion and the dorsal portion C partially overlap in a plan view as shown in FIG.

Explaining the laterally stretchable sheet member 5 and the vertically stretchable sheet member 7, the stretchable sheet members 5 and 7 may be made of a stretchable sheet material, or the non-stretchable sheet material may be made of an elastic member or the like. It may be one that can exhibit elasticity as a whole by joining the materials. The sheet material constituting the elastic sheet members 5 and 7 is not particularly limited, and examples thereof include fiber sheets such as non-woven fabrics, woven fabrics, and knitted fabrics; resin films and the like, which are appropriately selected according to the required quality of the diaper 1. can do. 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. The elastic sheet members 5 and 7 may have a single-layer structure or a laminated structure having two or more layers. The laminated structure may be a laminated structure of the same type of sheet material or a laminated structure of different types of sheet materials, and an example of the latter laminated structure is a laminated structure of a non-woven fabric and a resin film.

In the present embodiment, as described above, the laterally stretchable sheet member 5 of each of the ventral exterior body 4A and the dorsal exterior body 4C and the vertically stretchable sheet member 7 of the inseam exterior body 4B partially overlap each other, and the overlapping portion 9 thereof. When the lateral stretchable sheet member 5 and the vertical stretchable sheet member 7 each have a laminated structure in which a plurality of layers are laminated in the thickness direction and joined to each other, the diaper 1 From the viewpoint of improving the unified appearance of the above, 1) a joining pattern between both sheet members 5 and 7 in the overlapping portion 9, 2) a joining pattern between a plurality of layers in the laminated structure of the laterally stretchable sheet member 5, and 3) It is preferable that the bonding patterns of the plurality of layers in the laminated structure of the vertically stretchable sheet member 7 are the same as each other. That is, it is preferable that the joining patterns of the above 1) to 3) are the same.
The term "same joining pattern" as used herein means that it is basically the same as the above description, that is, "the shape and arrangement of the joining portions in a plan view are all the same". Regarding the above 2) and 3), the "joining portion" is an adhesive coating portion when the joining means between a plurality of layers in the laminated structure of both sheet members 5 and 7 is an adhesive, and the joining portion. When the means is fusion by heat fusion treatment, ultrasonic fusion treatment, or the like, it is a fusion portion. The above-mentioned description is appropriately applied to the above-mentioned "the same plan view shape of the joint portion" and "the same arrangement of the joint portions".

The stretchable sheet material constituting the stretchable sheet members 5 and 7 includes, for example, (1) a stretchable non-woven fabric in which an expandable fiber layer is integrated on both sides or one side of the elastic fiber layer, and (2) a net-like shape. Elastic non-woven fabric in which an stretchable fiber layer is integrated on both sides or one side of the elastic sheet, (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) A stretchable non-woven fabric in which a large number of elastic filaments arranged so as to extend in one direction without intersecting each other are integrated into an stretchable fiber layer, (5) a non-woven fabric in which unevenness is shaped, and the like. An example thereof is a composite stretchable member in which an elastic member extending in one direction is fixed between two sheet materials in a non-stretched state or an stretched state.
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.
As the composite telescopic member of (5), for example, the one described in International Publication No. 2018/189781 can be used.

FIG. 5 shows an elastic sheet material 15 which is an embodiment of a sheet material that can be used as the elastic sheet members 5 and 7. The stretchable sheet material 15 corresponds to the stretchable nonwoven fabric of (4) above. The elastic sheet material 15 is arranged between the two opposing fiber layers 16 and 17 and the two fiber layers 16 and 17, and does not intersect each other in one direction (direction indicated by reference numeral P in FIG. 5). ) With a plurality of elastic filaments 18. The plurality of elastic filaments 18 are bonded to the extensible fiber layers 16 and 17 over their entire length in a substantially non-elongated state. The plurality of elastic filaments 18 are intermittently arranged in the direction Q orthogonal to the extending direction P thereof.

The fiber layers 16 and 17 constituting the elastic sheet material 15 can be extended in the same direction as the extension direction P of the elastic filament 18. The "extensible" here means that (1) the constituent fibers of the fiber layers 16 and 17 themselves are elongated, and (2) the constituent fibers themselves are not elongated, but the fibers bonded at the intersection are connected to each other. This includes cases 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 layers 16 and 17 are elongated as a whole. ..

The elastic filament 18 is formed by stretching an elastic resin in a molten or softened state. Each of the plurality of elastic filaments 18 is continuously arranged over the entire length in the direction P of the elastic sheet material 15. The plurality of elastic filaments 18 are arranged so as to extend in one direction (direction P) without intersecting each other. The elastic filament 18 is bonded between the fiber layers 16 and 17 in a substantially non-stretched state. The bonding between the elastic filament 18 and the fiber layers 16 and 17 was performed by fusing the constituent fibers (non-elastic fibers) of both fiber layers 16 and 17 to the elastic filament 18 in a state of being embedded in the elastic filament 18. It is not made by using an adhesive such as a hot melt type adhesive. Therefore, there is no adhesive between the fiber layers 16 and 17 (extensible fiber layers mainly composed of inelastic fibers) and the elastic filament 18 bonded to the fiber layers 16 and 17.

The elastic sheet material 15 can be expanded and contracted in the same direction as the extension direction P of the elastic filament 18. The elasticity of the elastic sheet material 15 is exhibited due to the elasticity of the elastic filament 18. When the elastic sheet material 15 is stretched in the same direction as the extension direction P of the elastic filament 18, the elastic filament 18 and the fiber layers 16 and 17 are stretched. When the stretchable sheet material 15 is released from stretching, the elastic filament 18 contracts, and the fiber layers 16 and 17 return to the state before stretching as the elastic filament 18 shrinks. Further, in the elastic sheet material 15, the fiber layers 16 and 17 are stretched along the extending direction of the elastic filament 18 at the time of manufacture, so that the bonds between the fibers of the fiber layers 16 and 17 are partially broken. As a result, since the fiber layers 16 and 17 are provided with a stretch margin, when the stretchable sheet material 15 is stretched in the extending direction (direction P) of the elastic filament 18, the stretchable sheet material 15 shrinks in the direction Q. It can be stretched with almost no so-called width shrinkage.

The fiber layers 16 and 17 constituting the elastic sheet material 15 can 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. The fiber layers 16 and 17 may be of the same type or different from each other.
The elastic filament 18 constituting the elastic sheet material 15 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 it is an elastic sheet. Suitable for material 15. 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.

The stretchable sheet material 15 can be manufactured, for example, according to the method described in JP-A-2009-61743. Specifically, for example, while a plurality of elastic filaments 18 in a molten state spun from a spinning nozzle are taken up at a predetermined speed and stretched, the elastic filaments 18 do not intersect each other and unidirectionally before the elastic filaments 18 are solidified. The elastic filaments 18 are fused to the fiber layers 16 and 17 so as to be arranged to obtain an elastic sheet material precursor. Specifically, for example, the elastic filament 18 in a molten state is supplied between the two fiber layers 16 and 17, and the elastic filaments 18 are laminated by applying pressure to the elastic sheet material precursor. obtain. Then, the stretchable sheet material 15 can be manufactured by stretching the stretchable sheet material precursor along the extending direction of the elastic filament 18. The stretching treatment of the stretchable sheet material precursor is carried out, for example, by introducing the stretchable sheet material precursor between a pair of tooth groove rolls in which the teeth and the tooth bottom are alternately formed in the circumferential direction. In such a stretching treatment, the engagement between one tooth of both tooth groove rolls and the other tooth bottom partially breaks the fiber bond between the fiber layers 16 and 17, and extends to the fiber layers 16 and 17. Is provided. In this way, the stretchable sheet material precursor is stretched along the extending direction of the elastic filament 18 to become the stretchable sheet material 15.

Each of the elastic sheet members 5 and 7 may be composed of only the elastic sheet material 15, or may be composed of a laminated structure of the elastic sheet material 15 and another sheet material.
The other sheet materials used in combination with the elastic sheet material 15 are not particularly limited, and various sheet materials such as non-woven fabrics and resin films can be used. Further, the means for joining the elastic sheet material 15 to another sheet material is not particularly limited, and for example, by joining with an adhesive such as a hot melt type adhesive, fusion by heat fusion treatment, ultrasonic fusion treatment, or the like. Adhesion can be mentioned.
The lateral elastic sheet member 5 including the elastic sheet material 15 is arranged on the diaper 1 so that the elastic direction P (the direction in which the elastic filament 18 extends) of the elastic sheet material 15 coincides with the lateral direction Y of the diaper 1. .. Further, the vertical stretchable sheet member 7 including the stretchable sheet material 15 is arranged on the diaper 1 so that the stretchable direction P of the stretchable sheet material 15 coincides with the vertical direction X of the diaper 1.

The basis weights of the elastic sheet members 5 and 7 are preferably 20 g / m ² or more, more preferably 30 g / m ² or more, and preferably 60 g / m ² or less, more preferably 50 g / m ² or less, respectively. ..

The present invention can be applied to various forms of pants-type absorbent articles. The "absorbable article" as used herein broadly includes articles used for absorbing body fluids (urine, loose stool, menstrual blood, sweat, etc.) discharged from the human body, and in addition to the disposable diapers described above, for example, menstruation. Includes diapers, sanitary shorts, etc.

FIG. 6 shows the sanitary shorts 1A, which is another embodiment of the pants-type absorbent article of the present invention. Regarding other embodiments described later, components different from the above-described embodiment (diaper 1) will be mainly described, and similar components will be designated by the same reference numerals and description thereof will be omitted. The description of the above-described embodiment is appropriately applied to the components not particularly described.
In the side joint portion S of the above-mentioned diaper 1, the exterior bodies 4 (ventral exterior body 4A and dorsal exterior body 4C) are joined by fusion and protrude outward from the peripheral portion as shown in FIG. On the other hand, in the side joint portion S of the sanitary shorts 1A, the exterior bodies 4 (ventral exterior body 4A and dorsal exterior body 4C) are joined by sewing and protrude outward from the peripheral portion. Not. Due to the difference in the configuration of the side joint portion S, the sanitary shorts 1A have an appearance more like underwear than the diaper 1.

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 of the above-described embodiment, the exterior body 4 is in a form in which the exterior body 4 extends continuously from the ventral side portion A to the dorsal side portion C, but instead, the exterior body 4 has the ventral side portion A. A member constituting (front body F) and a member constituting the back side portion C (rear body R) may be independently provided, and the absorbent main body 2 may be bridged and fixed to both members.
All the parts of only one embodiment described above can be mutually used as appropriate.

1 Pants-type disposable diaper (pants-type absorbent article)
1A Pants-type sanitary shorts (pants-type absorbent goods)
X Vertical direction Y Horizontal direction F Front body R Back body A Abdominal side B Inseam C Dorsal side D1 First area (girth area)
D2 2nd area (around the waist)
S Side joint WH Waist opening LH Leg opening 2 Absorbent body 21 Front sheet 22 Back sheet 23 Absorber 3 Leakage-proof cuff 4 Exterior 4A Ventral exterior 4B Inseam exterior 4C Dorsal exterior 5 Lateral expansion and contraction Sheet member 6 Horizontal expansion and contraction part 7 Vertical expansion and contraction part 8 Vertical expansion and contraction part 9 Overlapping part 10, 11 Elastic member 12 Leg cover Sheet member 15 Elastic sheet material 16, 17 Fiber layer 18 Elastic filament

Claims (6)

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 and the wearer's lower part than the crotch part. It is divided into a ventral part arranged on the ventral side and a dorsal part arranged on the back side of the wearer rather than the crotch part, and an absorbent body including an absorber that absorbs and retains body fluid, and the absorbent body. It is provided with an exterior body arranged on the non-skin facing surface side of the main body, and both side edges of the exterior body along the vertical direction in each of the ventral side portion and the dorsal side portion are joined to each other to form a waist opening and a waist opening. A pants-type absorbent article in which a pair of leg openings are formed.
The exterior body includes a ventral exterior body constituting the ventral side portion, a dorsal exterior body constituting the dorsal side portion, and an inseam exterior body constituting the inseam portion.
The ventral exterior body and the dorsal exterior body each include the laterally stretchable sheet member and have the laterally stretchable portion.
The inseam exterior body includes the vertical stretchable sheet member having elasticity in the vertical direction, and has a vertical stretchable portion that stretches in the vertical direction.
The absorber overlaps with the inseam exterior body, and in the deployed and extended state of the pants-type absorbent article, the vertical length of the vertically stretchable sheet member constituting the inseam exterior body is the vertical length of the absorber. A pants-type absorbent article having the same length as the direction or longer than the length of the absorber in the vertical direction. The pants-type absorbent article according to claim 1, wherein the laterally stretchable sheet member and the vertically stretchable sheet member are of the same type. The ventral portion and the dorsal portion each have a waist circumference portion arranged around the waist of the wearer, and the waist circumference portion includes a first region including an opening peripheral edge of the waist opening. It has a second region composed of a portion other than the first region, and has a second region.
The one according to claim 1 or 2, wherein the magnitude relationship of the lateral extension stress of the first region> the lateral extension stress of the second region> the longitudinal extension stress of the inseam is established. Pants type absorbent article. The pants-type absorbent article according to any one of claims 1 to 3, wherein the absorbent body and the outer body are intermittently joined in the vertical direction. The item according to any one of claims 1 to 4, which has a buttock-corresponding portion arranged on the buttock of the wearer, and the lateral stretchable sheet member and the vertical stretchable sheet member overlap each other in the buttock-corresponding portion. The pants-type absorbent article described. The lateral stretchable sheet member of each of the ventral exterior body and the dorsal exterior body and the vertical stretchable sheet member of the inseam exterior body partially overlap and are joined to each other at the overlapping portion.
The lateral stretchable sheet member and the vertical stretchable sheet member each have a laminated structure in which a plurality of layers are laminated in the thickness direction and joined to each other.
1) Joining pattern of the laterally stretchable sheet member and the vertically stretchable sheet member in the overlapping portion, 2) Joining pattern of the plurality of layers in the laminated structure of the laterally stretchable sheet member, and 3) The above. The pants-type absorbent article according to any one of claims 1 to 5, wherein the joining patterns of the plurality of layers in the laminated structure of the vertically stretchable sheet member are the same as each other.

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