JP7377704B2 - Pants-type absorbent article - Google Patents

Description

The present invention relates to a pants-type absorbent article such as a pants-type disposable diaper.

A pants-type disposable diaper is known that has three main panels: a ventral panel, a dorsal panel, and a crotch panel. This type of diaper has the advantage of providing a large amount of leg room in the crotch area, making it easier for the wearer to move their legs, and providing a clean appearance when worn. However, on the other hand, the buttocks are easily exposed and coverage is not sufficient. Therefore, a proposal has been made to improve the coverage of the buttocks by providing a stretchable portion on the back panel with an elastic member extending in the lateral direction (see Patent Documents 1 and 2).

Apart from the above-mentioned techniques, a technique has also been proposed in which the fit of the diaper is improved by making the absorber thinner. For example, in Patent Document 3, in a disposable diaper equipped with an absorbent body consisting of two layers, an upper layer absorber and a lower layer absorber, the upper layer absorber is made of pulp and an absorbent polymer, and the lower layer absorber is placed between two sheets. It is described that it is composed of an absorbent polymer.

JP2016-202569A JP2018-503428A Unexamined Japanese Patent Publication No. 2018-50987

In the diapers described in Patent Documents 1 and 2, when the diaper is worn, the absorbent body is disposed near the leg openings, and the absorbent body is likely to deform due to the wearer's movements. In particular, if the absorbent body located at a position corresponding to the buttocks is deformed, the deformed absorbent body may enter the buttocks, leading to poor appearance when worn, discomfort when worn, and fluid leakage. When a thin absorbent body as described in Patent Document 3 is employed, the absorbent body is significantly deformed due to its low rigidity.

Therefore, an object of the present invention is to provide a pants-type absorbent article that prevents deformation of the absorbent body without impairing the good fit of the thin absorbent body and that exhibits an excellent appearance when worn. be.

The present invention provides a ventral exterior body disposed on the ventral side of a wearer, a dorsal exterior body disposed on the dorsal side of the wearer, and a bridge between the ventral exterior body and the dorsal exterior body. an absorbent main body fixed to these exterior bodies so as to cross the body, and having a longitudinal direction extending between the ventral exterior body and the dorsal exterior body and a lateral direction perpendicular to the longitudinal direction, A pants-type absorbent article comprising a side seal portion formed by joining both side edges of the ventral exterior body and the dorsal exterior body, wherein the absorbent main body is made of two pieces of the same or different The absorbent body includes an absorbent sheet including a fiber sheet and absorbent polymer particles arranged between the fiber sheets, and the back side exterior body extends downward from the lower end of the side seal portion. The dorsal side extending part is provided with a dorsal side extension part that extends and contracts along the horizontal direction, and when the absorbent article is viewed along the longitudinal direction, In a region where the dorsal elastic region and the absorbent body overlap in the lateral direction, the absorbent body includes an auxiliary layer that overlaps with the absorbent sheet in the lateral central region, and the central region overlaps with the absorbent sheet. To provide a pants-type absorbent article having higher rigidity than side regions adjacent to the pants.

According to the pants-type absorbent article of the present invention, deformation of the absorbent body is prevented without impairing the good fit of the thin absorbent body. Moreover, according to the pants-type absorbent article of the present invention, the wearer can easily move his/her legs. Further, according to the pants-type absorbent article of the present invention, the appearance when worn resembles underwear, and exhibits an excellent appearance.

FIG. 1 schematically shows the natural state of a pants-type disposable diaper, which is an embodiment of the pants-type absorbent article of the present invention. FIG. 2 is a developed plan view schematically showing the skin-facing surface side of the diaper shown in FIG. 1 in an unfolded and stretched state. FIG. 3 is an exploded perspective view schematically showing the skin-facing side of the diaper shown in FIG. 1 in an unfolded and stretched state. FIG. 4 is a cross-sectional view schematically showing a cross section taken along the line II along the longitudinal center line CLx in FIG. 2 when the diaper shown in FIG. 1 is worn. FIG. 5(a) is a cross-sectional view schematically showing the section taken along the line II-II in FIG. 2 when the diaper shown in FIG. be. FIG. 6 is a cross-sectional view schematically showing a cross section along the thickness direction of an embodiment of an absorbent sheet that can be used as an absorber according to the present invention. FIG. 7 is a schematic perspective view of the absorbent sheet shown in FIG. 6. FIG. 8 is an enlarged view illustrating another arrangement of the auxiliary layer. FIG. 9 is an enlarged view illustrating the configuration of a modified example of the auxiliary layer. FIG. 10 is an enlarged view illustrating the structure of an auxiliary layer including a low-rigidity portion. FIG. 11 is a diagram illustrating the structure of a pants-type absorbent article having a different structure of the back side exterior body. FIG. 12 is a diagram illustrating the structure of a pants-type absorbent article having a different structure of the back side exterior body.

The present invention will be described below based on preferred embodiments thereof with reference to the drawings. 1 to 4 show a pants-type diaper 1, which is an embodiment of the disposable diaper of the present invention.
As shown in FIG. 2, the diaper 1 has a longitudinal direction X corresponding to the front-back direction of the wearer and a lateral direction Y orthogonal thereto. The diaper 1 has a crotch section C, and an abdominal section A and a dorsal section B extending in the longitudinal direction X from the front and rear of the crotch section C. The diaper 1 extends in the longitudinal direction X from the abdominal part A to the back part B. In this specification, "the front-back direction of the wearer" is a direction extending between the ventral side and the back side of the wearer through the crotch area. The crotch area C is a region located between the wearer's crotch when the diaper 1 is worn. The abdominal part A is a part disposed on the ventral side of the wearer, that is, on the front side, with respect to the crotch C when the diaper 1 is worn. The back side part B is a part disposed on the back side of the wearer, that is, on the back side of the crotch area C when the diaper 1 is worn.

The diaper 1 includes a longitudinal centerline CLx located at the center of the longitudinal direction X. The longitudinal center line CLx is an imaginary straight line that bisects the diaper 1 in the unfolded and stretched state as shown in FIG. 2 in the longitudinal direction X and extends in the lateral direction Y. The "expanded and stretched state" of the diaper 1 means that the diaper 1 is separated at the side seal portion (described later) to be in the unfolded state, and the diaper 1 in the unfolded state is expanded to the design dimensions (to reduce the influence of the elastic members). This refers to the state in which the material is expanded until it has the same dimensions as when it is expanded into a flat surface without removing anything.

The diaper 1 includes an absorbent main body 2 and an exterior body 30. As shown in FIG. 3, the exterior body 30 includes outer layer sheets 31 and 32 and inner layer sheets 33 and 34 from the non-skin facing side to the skin facing side. The outer layer sheet 31 and the inner layer sheet 33 are joined to each other to constitute a ventral exterior body 3A placed on the wearer's ventral side, and the outer layer sheet 32 and the inner layer sheet 34 are joined to each other to constitute the ventral side exterior body 3A placed on the wearer's back side. It constitutes a dorsal exterior body 3B.
The outer layer sheets 31 and 32 are elastic sheets. The outer layer sheets 31 and 32 form the outer surface of the diaper 1, that is, the non-skin facing surface, at least in the ventral side part A and the back side part B. Inner layer sheets 33 and 34 are non-stretchable sheets. The outer layer sheets 31 and 32 are stretched in the lateral direction Y and are bonded to the inner layer sheets 33 and 34, respectively, by known bonding means such as an adhesive.

The diaper 1 is a pair of diapers formed by joining both side edges AS and BS of the ventral exterior body 3A and the dorsal exterior body 3B to each other by a known joining means such as adhesive, heat sealing, ultrasonic sealing, etc. It is equipped with side seal parts S and S. As shown in FIG. 1, the diaper 1 has a waist opening WH through which the wearer's torso passes, by joining the ventral exterior body 3A and the dorsal exterior body 3B at the side seal portions S, S. and a pants-shaped absorbent article having a pair of leg openings LH, LH through which the wearer's lower legs are passed.

In this specification, the "skin-facing surface" refers to the surface of the diaper 1 that is an absorbent article or its constituent members (for example, the absorbent main body) that faces the wearer's skin when the diaper 1 is worn, that is, the surface that faces the wearer's skin when the diaper 1 is worn. The "non-skin facing surface" refers to the side of the diaper 1 or its constituent members that is opposite to the skin side when the diaper 1 is worn, that is, the side that is relatively far from the wearer's skin. It is a side that can be used. In addition, "when worn" here means a state where the normal proper wearing position, that is, the correct wearing position of the absorbent article is maintained, and when the absorbent article is shifted from the wearing position. is not included.

The diaper 1 is divided into a ventral exterior body 3A and a dorsal exterior body 3B, which are divided in the longitudinal direction The absorbent body 2 is fixed to the absorbent body 2.
As shown in FIG. 2, the absorbent main body 2 has a rectangular shape in plan view, and its longitudinal direction is aligned with the longitudinal direction It is arranged in the center of Y and extends in the longitudinal direction X from the ventral part A to the dorsal part B. In the absorbent main body 2, the extensions 33a and 34a formed on the inner sheets 33 and 34 are folded back toward the skin-facing surface side, and are bonded to the inner sheets 33 and 34 by covering both ends 2A and 2B located in the longitudinal direction X. Thus, it is fixed to the ventral exterior body 3A and the dorsal exterior body 3B.

The ventral exterior body 3A and the dorsal exterior body 3B include a plurality of thread-like or band-like waist elastic members 41, 41 arranged in a stretched state between the outer layer sheet 31 and the inner layer sheet 33, and between the outer layer sheet 32 and the inner layer sheet 34. Each is equipped with Specifically, in each of the abdominal part A and the dorsal part B , a plurality of waist elastic members 41 are provided in the open end of the waist opening WH and a region in the vicinity thereof, in a state of being stretched in the horizontal direction Y and in a vertical direction. They are arranged intermittently at predetermined intervals in the direction X. The waist elastic member 41 extends outward in the longitudinal direction X from the edge of the absorbent main body 2 in the longitudinal direction It is placed in the area where it was released. Such a region corresponds to the area around the wearer's waist and its vicinity in the worn state. The waist elastic member 41 is disposed over substantially the entire length of the exterior body 30 in the lateral direction Y so as to exhibit elastic stretchability. Thereby, a substantially continuous annular waist gather WG is formed over the entire circumference of the waist opening WH.

Waist circumference gathers BG are formed in the ventral side part A and the dorsal side part B. The waist circumference gathers include a ventral exterior body 3A, a dorsal exterior body 3B, and a plurality of elastic members 42 for forming waist circumference gathers fixed to the ventral exterior body 3A and the dorsal exterior body 3B. has been done. The elastic member 42 is arranged in a region that overlaps with the absorbent body 5 in the horizontal direction Y when the diaper 1 is viewed in the vertical direction X. The elastic members 42 extend in the horizontal direction Y and are disposed intermittently in the vertical direction X on the ventral exterior body 3A and the dorsal exterior body 3B. The elastic member 42 is a plurality of thread-like or band-like elastic members disposed in a stretched state between the outer layer sheets 31, 32 and the inner layer sheets 33, 34. The waist gathers BG are each formed by fixing the elastic member 42 to the back side exterior body 3B in a state of being stretched in the lateral direction Y, and then releasing the elastic member 42 from the stretched state. When the diaper 1 is worn, the waist gathers BG are formed in a region below the waist gathers WG due to contraction of the elastic member 42. Hereinafter, the elastic region in the abdominal part A of the diaper 1 in which the waist gathers BG are formed will also be referred to as the "abdominal elastic region X2."

As shown in FIG. 2, the back side exterior body 3B includes a back side extension part 39 extending from the lower end Sa of the side seal part S toward the crotch area C where the vertical center line CLx is located downward. ing. This dorsal side extension part 39 is provided with a dorsal side stretchable region X1 that can be stretched and contracted along the lateral direction Y. The dorsal side extension part 39 is formed with curved parts 39a and 39b which are curved so that the length in the lateral direction Y gradually becomes shorter toward the lower crotch part C. The curved portions 39a and 39b are formed from side edges 39c and 39d of the dorsal extension portion 39 located in the lateral direction Y toward terminal ends 39e and 39f located on the center side. The width W in the lateral direction Y from the terminal end 39e to the terminal end 39f is formed wider than the width W1 of the absorbent main body 2 in the lateral direction Y, so that the absorbent main body 2 is It is designed so that it does not protrude into Y.

The back elastic region X1 includes leg elastic members 43, 43 arranged in a stretched state so as to draw a curve around the wearer's legs. The leg elastic members 43, 43 are disposed in a stretched state between the inner layer sheet 33 and the outer layer sheet 31, and are composed of a plurality of thread-like or band-like elastic members. The dorsal elastic region X1 can be expanded and contracted along the lateral direction Y by these leg elastic members 43, 43. The leg elastic members 43, 43 are arranged along the curved portions 39a, 39b of the dorsal extension portion 39. The outer ends 43a, 43a of the leg elastic members 43, 43 are located on the side edges 39c, 39d of the dorsal extension 39, and the inner ends 43b, 43b of the leg elastic members 43, 43 are located near the terminal ends 39e, 39f. It is located in The inner ends 43b, 43b are arranged so as not to reach the central region 5A of the absorbent core 5 included in the absorbent main body 2.
In this embodiment, the leg elastic members 43, 43 are formed so as not to be disposed in the central region 5A of the absorbent body 5, but when the leg elastic members 43, 43 are disposed up to the central region 5A, the elasticity is It is preferable to arrange it in such a manner that it is not expressed.

As shown in FIGS. 4 and 5, the absorbent main body 2 includes a liquid-permeable top sheet 3 located relatively close to the wearer's skin, and a liquid-permeable top sheet 3 located relatively far from the wearer's skin. The absorbent body 5 includes a liquid-impermeable, slightly liquid-permeable, or water-repellent (in short, leak-proof) back sheet 4, and an absorbent body 5 interposed between the top sheet 3 and the back sheet 4.
The absorbent body 5 includes an absorbent sheet 51, an auxiliary layer 52 that overlaps the absorbent sheet 51, and a core wrap sheet (not shown) that covers the outer surfaces of the absorbent sheet 51 and the auxiliary layer 52. There is. These members constituting the absorbent main body 2 are joined together by known joining means such as adhesive. As these members constituting the absorbent main body 2, those normally used in this type of absorbent article may be used without particular restriction, provided that the members comply with the explanations described below. can.

The topsheet 3 crosses the skin-facing surface side of the absorbent body 5 (a pair of first standing portions 50 and non-standing portions 51 described later) in the horizontal direction Y, and extends in the longitudinal direction X of the absorbent body 5 in the topsheet 3. Extending portions 3E from both side edges (a pair of first standing portions 50, 50) are wrapped around the non-skin facing side of the absorbent body 5.
In this embodiment, the pair of extensions 3E, 3E of the topsheet 3 are connected to the absorber 5 and the leak-proof cuff forming sheet 80, which will be described later, at the base end 81 of the leak-proof cuff 8, which will be described later. fixed between. The topsheet 3 does not cover the entire area of the non-skin facing surface of the absorbent body 5, but covers the central portion of the non-skin facing surface of the absorbent body 5 in the lateral direction Y (located between the pair of proximal end portions 81, 81). portion) is not covered with the topsheet 3 (extending portion 3E).

In this embodiment, a pair of leak-proof cuffs 8, 8 and a pair of leg gathers 90, 90 are arranged on both sides of the absorbent main body 2 (absorbent body 5) in the longitudinal direction X, respectively. The pair of leak-proof cuffs 8, 8 and the pair of leg gathers 90, 90 do not overlap the central region 5A in the horizontal direction, and extend in the vertical direction X in the side region (5B) adjacent to the central region 5A. are doing. The leg gathers 90, 90 are arranged outside the pair of leakage prevention cuffs 8, 8 in the width direction Y.
To explain more specifically, the leg gathers 90, 90 include a plurality of leg elastic members 91 extending in the vertical direction X. The leg elastic member 91 is enclosed in the sheet 92 in a stretched state so as to extend in the longitudinal direction X through the crotch area C. This sheet 92 is joined to the absorbent body 5 side via an adhesive member, and constitutes the main body first elastic regions 90, 90. The first elastic regions 90, 90 of the main body can be expanded and contracted by the leg-surrounding elastic members 91, 91 arranged in an expanded state. The leg elastic members 91, 91 are composed of a plurality of thread-like or band-like elastic members.
Each leak-proof cuff 8 is configured to include a leak-proof cuff forming sheet 80 that is liquid-resistant or water-repellent and breathable, and the sheet 80 is folded in two in the horizontal direction Y. Contains parts with a layered structure. Each leak-proof cuff 8 (leak-proof cuff forming sheet 80) is continuously arranged along the side portion of the absorbent body 2 along the longitudinal direction X over substantially the entire length of the absorbent body 2 in the longitudinal direction X. There is. As the leak-proof cuff forming sheet 80, materials used as materials for leak-proof cuffs in this type of absorbent article can be used without particular limitation, such as single-layer or multi-layer water-repellent nonwoven fabric, resin film, etc. A laminate material of a non-woven fabric or the like can be used.

The leak-proof cuff 8 has a proximal end portion 81 in which a leak-proof cuff forming sheet 80 is fixed to another member, and a second standing portion 82 in which the sheet 80 stands up toward the wearer. The second upright portion 82 is a portion of the leak-proof cuff forming sheet 80 that is not fixed to other members.

The proximal end portion 81 is a portion that becomes the proximal end when the second upright portion 82 stands up toward the wearer's skin when the diaper 1 is worn, and the leak-proof cuff forming sheet 80 is made of hot melt or the like. This is a portion that is fixed to another member, specifically, the absorbent body 2 and/or the exterior body 30, by a known fixing means such as an adhesive or heat fusion. The base end portion 81 extends continuously or discontinuously in the longitudinal direction X over substantially the entire length of the leak-proof cuff forming sheet 80 in the longitudinal direction X.

The second upright portion 82 is partially stretchable in the vertical direction X.
In this embodiment, as shown in FIGS. 4 and 5(a) and 5(b), the free end portion of the second standing portion 82 (the part closest to the wearer's skin when the second standing portion 82 stands up) , a first leak-proof cuff forming elastic member (hereinafter referred to as "first elastic member") 83 is arranged to extend in the vertical direction A second leak-proof cuff forming elastic member (hereinafter referred to as "second elastic member") 84 is disposed at an intermediate position between the end portion 81 and the end portion 81 so as to extend in the vertical direction X. The first and second elastic members 83 and 84 are fixed in a stretched state between the leak-proof cuff forming sheets 80 and 80 forming a two-layer structure by a fixing means such as an adhesive. The second upright portions 82, 82 have elasticity in the vertical direction X at the fixed portions of the first and second elastic members 83, 84.
That is, the absorbent main body 2 includes a first main body elastic region 90 and a second elastic region that extends in the vertical direction The second standing portion 82 is provided. The main body first stretchable region 90 and the second upright portion 82, which is the second stretchable region, extend beyond the end of the auxiliary layer 52 on the back side exterior body side (hereinafter referred to as the "backside end 52d"). . The end of the second upright portion 82 in the longitudinal direction X in the back side portion may be located near the back end 52d. Similarly, the end of the main body first elastic region 90 in the longitudinal direction X in the back side portion may be located near the back side end portion 52d. This vicinity is, for example, a region within ±10 mm from the back end 52d of the auxiliary layer 52.

As shown in FIG. 2, at both ends of the leak-proof cuff 8 in the longitudinal direction X, rise-up inhibiting portions 85 are formed, which are portions in which the rise of the leak-proof cuff forming sheet 80 is inhibited. The standing-up inhibiting portion 85 is formed on the ventral side portion A and the dorsal side portion C, and the portion sandwiched between both standing-up inhibiting portions 85, 85 is the second standing portion 82. The rise inhibiting portion 85 is formed by fixing the leak-proof cuff forming sheet 80 to the skin-facing surface (top sheet 3) of the absorbent main body 2. The fixing portion can be formed using a known fixing means such as an adhesive such as hot melt or heat fusion.

The numbers of the first and second elastic members 83 and 84 are not particularly limited, and each may be one or more. The second elastic member 84 (the elastic member disposed at an intermediate position between the free end portion of the second upright portion 82 and the base end portion 81) may not be provided.

As described above, by forming the pair of standing-up inhibiting parts 85, 85 at both ends of the leak-proof cuff 8 in the longitudinal direction Due to the contractile force of the first and second elastic members 83 and 84, the second upright portion 82 is worn with the proximal end 81 as the upright proximal end, as shown in FIGS. 5(a) and 5(b). Stand up facing the person's skin. In such an upright state of the leakage prevention cuff 8, the upright second upright portion 82 blocks the outward movement of body fluids such as urine excreted by the wearer in the lateral direction Y, so that the absorbent body 5, which will be described later, Together with the body fluid damming effect by the pair of first upright portions 50, 50 on both sides in the lateral direction Y, lateral leakage is effectively suppressed.
In addition, when the leakage prevention cuff 8 is in the upright state, the contractile force of the first and second elastic members 83 and 84 causes the entire diaper 1 to be compressed so that the central region 5A of the absorbent body 2 in the longitudinal direction Since the diaper 1 is curved and deformed so as to be convex toward the side (back sheet 4 side), the diaper 1 can easily fit the wearer's body shape. Furthermore, since the second standing portion 82 extends beyond the back end portion 52d of the auxiliary layer 52, the second standing portion 82 can be made to stand up reliably, which is preferable.

The absorbent body 5 has a pair of first and second grooves located at least in the crotch area C, in both side areas 5B, 5B across the central area 5A in the lateral direction Y of the absorbent body 5, and that stand up toward the skin side of the wearer when worn. It has one standing part 50, 50 and a non-standing part 51 located in the central region 5A and sandwiched between the pair of first standing parts 50, 50.

In this embodiment, as shown in FIGS. 4 and 5, at or near both edges of the absorbent body 5 along the longitudinal direction X (for example, an area within 15 mm from the side edges of the absorbent body 5 along the longitudinal direction , a side elastic member 9 for raising the first upright portion 50 is disposed. The side elastic members 9 are arranged between the top sheet 3 and the core wrap sheet. That is, in the absorbent main body 2, a pair of first upright portions 50, 50 extending in the vertical direction X are formed on both sides of the absorbent core 5, as shown in FIGS. 4 and 5. The first upright portions 50, 50 extend beyond the back end 52d of the auxiliary layer 52. The side elastic members 9 are disposed between the absorbent body 5 and the top sheet 3 in a state of being stretched in the longitudinal direction It is fixed by the fixing means of. The side elastic member 9 is disposed at least in the crotch area C, and may be one piece as shown in the figure, or may be a plurality of pieces.

The first upright portions 50, 50 and the second upright portion 82 do not necessarily need to extend beyond the back end 52d of the auxiliary layer 52, as long as they extend at least to the vicinity of the back end 52d. The first standing portions 50, 50 and the second standing portions 82, 82 can be sufficiently raised. The vicinity here refers to the end edge position of the first upright portion 50 (the end edge position of the side elastic member 9) and the end edge position of the second upright portion 82 (the first and second elastic Based on the fact that the end edge positions of the members 83 and 84 coincide with the dorsal end portion 52d in the longitudinal direction X, this is within the design tolerance range in the longitudinal direction X. For example, when the dorsal end 52d is taken as the reference position in the longitudinal direction, the vicinity refers to a range of up to ±35 mm for the first upright portions 50, 50, and a range of ±10 mm for the second upright portion 82 as described above. Refers to the range up to.

In this embodiment, the side elastic members 9, which are the first stretchable regions 90 of the main body, are fixed to both sides of the absorber 5 in the lateral direction Y, so that when the diaper 1 is worn, this absorbent Both sides of the body 5 in the lateral direction Y stand up toward the wearer's skin side as a pair of first upright portions 50, 50 due to contraction of the side elastic members 9. This standing up is further promoted by the standing up of the second standing portion 82, which is the second stretchable region. In a cross-sectional view along the lateral direction Y as shown in FIG. 5, the absorbent body 5 has a non-standing portion 51 as a bottom portion, and a pair of first standing portions 50, 50 extending obliquely from the bottom portion toward the wearer's skin side. It is tray-shaped, with the sides being the sides.

As materials for the various elastic members in the diaper 1, including the side elastic members 9, unless otherwise specified, various known elastic materials commonly used in this type of absorbent article can be used without particular restriction. Examples include synthetic rubbers such as styrene-butadiene, butadiene, isoprene, and neoprene, natural rubber, EVA, stretchable polyolefin, and polyurethane. As for the form of the elastic member, it is preferable to use a thread-like material (thread rubber, etc.) or a string-like material (flat rubber, etc.) having a rectangular, square, circular, or polygonal cross section, or a multifilament-type thread-like material. can.

The auxiliary layer 52 of the absorbent body 5 is laminated to overlap the absorbent sheet 51. The auxiliary layer 52 has a rectangular shape in plan view, and is disposed at the center of the absorbent sheet 51 in the horizontal direction Y so that its long sides are along the longitudinal direction It is located. The auxiliary layer 52 is arranged in a region where the back elastic region X1 and the absorbent core 5 overlap in the horizontal direction Y when the diaper 1 is viewed in the vertical direction X. That is, in one embodiment of the absorbent body 5, the central region 5A including the auxiliary layer 52 has a multilayer structure in which the absorbent sheet 51 and the auxiliary layer 52 are laminated, and the central region 5A is adjacent to the central region 5A. The side regions 5B, 5B have a single layer structure of the absorbent sheet 51 alone. In this embodiment, the auxiliary layer 52 has the same thickness and the same density (basis weight) in the vertical direction X and the horizontal direction Y. Therefore, the central region 5A of the absorbent body 5 has higher rigidity than the side regions 5B, 5B by the amount of the auxiliary layer 52. Stiffness is a physical property value measured with a handrometer testing machine (manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd.).
The structure of the absorber 5 does not need to be a single layer as long as the side regions 5B have lower rigidity than the center region 5A; for example, the structure may have three layers in the center region 5A and two layers in the side regions 5B. It's okay. Further, the auxiliary layer 52 may have a structure in which the densities are not the same as described above, but are partially different.

According to one diaper of this embodiment, the exterior body is divided into the ventral exterior body 3A and the dorsal exterior body 3B, and in the crotch area C, the absorbent body is made of a thin absorbent sheet 51. Since the main body 2 is arranged, the wearer can easily move his/her feet and the fit is good. Further, a dorsal side extension part 39 is formed in the dorsal side exterior body 3B, which extends downward from the lower end Sa of the side seal part S and has a dorsal side stretchable region X1 that can be expanded and contracted along the lateral direction Y. Therefore, it has excellent fit around the buttocks (coverage) and looks like underwear when worn.

Furthermore, an auxiliary layer 52 is arranged in the central region 5A in the lateral direction Y of the absorbent body 5 located in the crotch area C, which is a region where the absorbent body 5 is easily deformed due to the movement of the wearer. By making the rigidity higher than that of the side regions 5B, 5B, the deformation of the central region 5A can be suppressed without inhibiting the deformation of the absorbent sheet 51 in the side regions 5B, 5B, resulting in a good fit. It is possible to provide a pants-type diaper 1 in which the deformation of the absorbent body 5 is prevented without impairing the wearability, and the diaper 1 has an excellent appearance when worn.

Further, if the auxiliary layer 52 is arranged in the central region 5A (non-standing portion 51) in the lateral direction Y, the bending starting point when the pair of first erecting portions 50 performs the erecting operation is in the lateral direction Y of the auxiliary layer 52. It can be formed by the corner portions 52a1, 52b1 of the side edges 52a, 52b located thereon. Further, it is preferable that the positions of the side edges 52a, 52b and the base end portion 81 are the same when viewed along the lateral direction Y, at least in the crotch portion C.
Therefore, when the wearer is worn, the pair of first upright portions 50 are lifted at the crotch area C to more reliably stand up, thereby improving the fit. Furthermore, when the pair of first standing portions 50 extend beyond the dorsal end portion 52d of the auxiliary layer 52 located on the dorsal exterior body 3B side, the first standing portions 50 are lifted at the crotch portion C. The fit is improved because the user can more reliably stand up.

According to one diaper of this embodiment, the length of the back side extension part 39 in the lateral direction Y becomes shorter as it goes downward, so that the back side extension part 39 in the crotch area C becomes stiff. Since the discomfort can be reduced, the wearer's comfort is further improved, and the appearance when worn resembles underwear, providing an excellent appearance.

According to the diaper of this embodiment, the back elastic region X1 can be expanded and contracted by the leg elastic members 43, so that the stiffness of the back extension 39 in the crotch C can be further reduced. Therefore, when worn, it looks like underwear, giving it an excellent appearance. Furthermore, since the leg elastic members 43 are not arranged in the central region 5A of the absorbent body 5, the contraction effect on the central region 5A can be reduced, thereby suppressing deformation of the absorbent body 5 (absorbent sheet 51) in the central region 5A. It is preferable in that it does.

The auxiliary layer 52 is preferably composed of a mixed fiber stack containing at least water-absorbing natural fibers and an absorbent polymer. This mixed fiber stack may be made of, for example, only water-absorbing natural fibers and absorbent polymers, or may contain other materials, such as synthetic fibers, in addition to water-absorbing natural fibers and absorbent polymers. By employing this configuration, the absorbent body 5 can obtain high liquid absorbency in combination with the absorbent sheet 51.

Next, the length of the auxiliary layer 52 in the vertical direction X will be explained.
In FIG. 2, the length L of the auxiliary layer 52 from the dorsal end 52d to the ventral end 52c on the opposite side is from one side edge 52a located in the lateral direction Y to the other side. It is formed longer than the length L1 to the edge 52b. In the present embodiment, the dorsal end portion 52d is located approximately at the center of the dorsal elastic region X1 of the dorsal extension portion 39 in the longitudinal direction X, and the ventral end portion 52c is located near the longitudinal center line CLx. It is arranged on the absorbent sheet 51 so as to be located at the same position. Since the wearer's buttocks are located closer to the back exterior body 3B when the diaper is worn, if the auxiliary layer 52 is arranged in the position shown in FIG. In particular, the rigidity of the part corresponding to the intergluteal cleft and its vicinity can be increased. This can reduce the risk of deterioration of the wearing appearance, discomfort of wearing, and occurrence of liquid leakage.

As another arrangement form of the auxiliary layer 52, from the viewpoint of increasing the rigidity on the buttock side, for example, as shown in FIG. The positions of the end portions 52d may be aligned along the longitudinal direction X. In this case, it is preferable that the length L (total length) of the auxiliary layer 52 is at least equal to or longer than the length of the back elastic region X1.

A modification of the auxiliary layer will be explained using FIG. 9.
The auxiliary layer 152 shown in FIG. 9 is arranged in the central region 5A in the horizontal direction Y of the absorbent sheet 51. The auxiliary layer 152 has a substantially rectangular shape extending from the dorsal exterior body 3B to the ventral exterior body 3A, and has a widened portion 153 formed on the ventral end portion 152c side. The auxiliary layer 152 is made of absorbent material such that the dorsal end portion 152d overlaps with the dorsal stretchable region X1 of the dorsal exterior body 3B and the widened portion 153 overlaps with the abdominal stretchable region X2 of the ventral exterior body 3A in plan view. It is fixed to the seat 51.

The widened portion 153 is a portion whose length in the lateral direction Y increases from the dorsal exterior body 3B to the ventral exterior body 3A, and its width L2 is longer than the width L1 of the dorsal end portion 152d. has been done.
The widened portion 153 has end surfaces 153a and 153b located in the lateral direction Y formed as inclined surfaces so that the length in the lateral direction Y increases continuously for the purpose of following the outer shape of the leg when worn. There is. This inclined portion is arranged so as to overlap the lower edge 3Aa of the ventral exterior body 3A in a plan view.
The widened portion 153 may have a shape in which the length in the lateral direction Y increases stepwise instead of continuously increasing in length.

In this way, the auxiliary layer 152 has a length extending from the dorsal exterior body 3B to the ventral exterior body 3A, thereby increasing the rigidity of the absorbent body 5 in the entire lengthwise direction X of the crotch area C. This is preferable because it can be done. Further, since the widened portion 153 formed so that the length in the lateral direction Y continuously increases is disposed on the ventral exterior body 3A side, the liquid absorption capacity of the absorbent body 5 on the ventral side can be secured. Therefore, it is preferable.
Since the widened portion 153 has inclined end surfaces 153a and 153b located so as to overlap the lower edge 3Aa of the ventral exterior body 3A, it deforms along the appearance of the legs when wearing the diaper. This improves the fit when worn and makes it easier for the wearer to move his or her feet. The auxiliary layer 152 overlaps with the dorsal elastic region X1 of the dorsal exterior body 3B in a plan view (thickness direction), and the widened portion 153 overlaps with the waist elastic region X2 of the ventral exterior body 3A, so that when worn, This is preferable because it provides better fit.

In the above embodiment, the auxiliary layer 52 has the same thickness and the same density (basis weight) in the vertical direction X and the horizontal direction Y, but as shown in FIG. 10, the auxiliary layer 52 extends in the vertical direction The auxiliary layer 52 may have a low-rigidity region 521 having lower rigidity than other regions. The low-rigidity portion 521 is a groove-shaped recess that is depressed from the auxiliary layer 52 toward the absorbent sheet 51, and extends along the vertical direction X and is lined up in the horizontal direction Y in the central region of the absorbent core 5. This is a multi-row, low-rigidity region formed. The low-rigidity portion 521 is not limited to a multi-strip configuration, and may be, for example, a single-striped low-rigidity portion composed of one low-rigidity portion 521.
In the absorber 5, the portion that overlaps with this groove-like recess in plan view has a lower basis weight than the surrounding area, that is, the mass (basis weight) per unit area of the forming material is smaller than the surrounding area, and is a low-rigidity area. It is said to be 521.
One end 521a of the low-rigidity portion 521 located on the side of the ventral exterior body 3A extends forward beyond the lower edge 3Aa of the ventral exterior body 3A. Specifically, one end 521a of the low-rigidity portion 521 extends forward beyond the lower edge 3Aa of the ventral exterior body 3A to a position where it overlaps with the abdominal elastic region X2 (waist gathers BG). The "front direction" refers to a direction approaching the waist opening in the abdominal part A with respect to the longitudinal direction X of the diaper 1. The other end 521b of the low-rigidity portion 521 located on the back side exterior body 3B side does not reach the back side exterior body 3B.

In this way, when the low-rigidity parts 521 are partially formed in the auxiliary layer 52, the number of low-rigidity parts 521, the length in the vertical direction X, and the length (width) in the horizontal direction Y can be adjusted. This is preferable because the rigidity of the auxiliary layer 52 and, in turn, the rigidity of the absorber 5 can be easily adjusted.
Moreover, when the low-rigidity portion 521 is formed as a groove-like recess, it is more preferable because it is located on the side that comes into contact with the wearer's skin when worn and can function as a liquid guide channel.

In the embodiment described above, the leg elastic members 43, 43 are arranged in the dorsal elastic region X1 of the dorsal exterior body 3B, but the structure other than the leg elastic members 43, 43 explained in the above embodiment is different. , it can be applied to a diaper 1 provided with a separate back exterior body.
For example, a diaper 1A shown in FIG. 11 differs from the above-described embodiment in the configuration of the back exterior body. That is, the diaper 1A shown in FIG. 11 includes a back side exterior body 3C instead of the back side exterior body 3B. The difference between the dorsal exterior body 3B and the dorsal exterior body 3C is the configuration of the elastic member provided in the dorsal expansion/contraction region X1 of the dorsal extension portion 39. This elastic member 47 is an elastic member disposed in a stretched state along the lateral direction Y, and allows the back side exterior body 3C to be expanded and contracted in the lateral direction Y.

More specifically, like the elastic member 41, the elastic member 47 is a plurality of thread-like or band-like elastic members disposed in a stretched state between the outer layer sheet 32 and the inner layer sheet 34. The elastic members 47 each extend in the horizontal direction Y and are disposed intermittently in the longitudinal direction X on the back side exterior body 3C. Therefore, in the back side exterior body 3C, gathers similar to the waist gathers BG formed by the elastic member 41 are formed in the back side extension portion 39. Of course, the elastic member 47 is not disposed in the central region of the absorbent body 5, but is laterally divided into Y-shaped sections with the absorbent body 5 as a border. The diaper 1A having such a configuration is preferable because it provides the same effects as the diaper 1.

Next, a preferred embodiment of the absorbent sheet 51 will be described with reference to FIGS. 6 and 7. The absorbent sheet 51 is a thin absorbent sheet that includes a first fiber sheet 511, a second fiber sheet 512, and a plurality of particles of absorbent polymer 513 arranged between both sheets 511 and 512. It is. Both sheets 511 and 512 are bonded to each other with an adhesive 514. In the illustrated form, adhesive 514 is placed on the inner surfaces of both sheets 511 and 512 (the surfaces facing absorbent polymer 513). A plurality of particles of the absorbent polymer 513 are arranged in a certain mass in the surface direction of the absorbent sheet 51, forming an area in which the absorbent polymer 513 is arranged.

In the region in which the absorbent polymers 513 are arranged in the absorbent sheet 51, the absorbent polymers 513 are arranged in such a manner that macroscopically visible gaps are not observed. Here, "no macroscopically visible gap is observed" means that the absorbent polymer 513 is arranged so as to evenly cover one surface of the fiber sheet, but when the area is microscopically observed, In such a case, it is acceptable that voids are unintentionally formed between the absorbent polymers 513. This void is approximately 10 to 1000 μm in size. In the following description, the voids between the absorbent polymers 513 that are microscopically observed in the region where the absorbent polymers 513 are arranged are also referred to as "microscopic voids."

In the area where the absorbent polymer 513 is arranged, the first fiber sheet 511 and the second fiber sheet 512 are directly bonded by the adhesive 514 without using the absorbent polymer 513 (hereinafter referred to simply as " 515 (also referred to as "direct joining site"). The direct bonding portions 515 are formed in each of the above-mentioned microscopic voids. In the direct bonding portion 515, when viewed in cross section in the sheet thickness direction, the adhesive 514 forms a column and directly bonds the sheets 511, 512 together. Further, a plurality of direct bonding portions 515 are formed in a regular or irregular dot shape when the absorbent sheet 51 is viewed in the sheet plane direction. By forming the direct bonding portion 515, the absorbent polymer 513 can be held in a predetermined position on the absorbent sheet 51, and the liquid absorbing ability of the absorbent polymer 513 can be fully exhibited. The direct bonding portion 515 can be formed, for example, by appropriately adjusting the basis weight and particle size of the absorbent polymer 513, or the application amount and area of the adhesive 514.

As shown in FIGS. 6 and 7, the absorbent sheet 51 has, in addition to a directly joined region 515, a region (hereinafter referred to as (also referred to as "indirect joint site") 516. In the indirect bonding region 516, the region where the adhesive 514 is applied on the first fiber sheet 511, the region where the absorbent polymer 513 is present, and the region where the adhesive 514 is applied on the second fiber sheet 512 overlap in the thickness direction. There is. With this configuration, the absorbent polymer 513 can be held at a predetermined position on the absorbent sheet 51, and unintentional movement and uneven distribution of the absorbent polymer 513 can be further reduced, and the absorbent sheet The liquid absorbency of 51 can be further improved.

As the adhesive 514, it is preferable to use an adhesive that has flexibility so that it can expand following the swelling change caused by the absorption of liquid by the absorbent polymer 513. Examples of such raw materials include (co)polymers of vinyl monomers such as 2-ethylhexyl acrylate, butyl acrylate, ethyl acrylate, cyanoacrylate, vinyl acetate, methyl methacrylate, etc. (ethylene vinyl acetate copolymers, etc.) ), silicone adhesives containing polydimethylsiloxane polymers, natural rubber adhesives containing natural rubber, polyisoprene, chloroprene, etc. Isoprene adhesives, styrene-butadiene copolymer (SBR), styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer (SBS), styrene-ethylene-butadiene-styrene block copolymer Examples include rubber adhesives such as styrene adhesives containing one or more of polymer (SEBS) and styrene-ethylene-propylene-styrene block copolymer (SEPS). These may be used alone or in combination of two or more. As shown in FIG. 9, when the adhesive 514 is disposed on the surface (inner surface) facing the absorbent polymer 513 of each sheet 511, 512, the adhesive disposed on the first fiber sheet 511 514 and the adhesive 514 disposed on the second fiber sheet 512 may be of the same type or may be of different types.

Among these, the two sheets 511 and 512 are excellent in flexibility and stretchability, and even after the absorbent polymer 513 swells, the two sheets 511 and 512 are maintained in a directly bonded state, and the two sheets 511 , 512, it is preferable to use a rubber adhesive as the adhesive 514, and among the rubber adhesives, it is more preferable to use a styrene adhesive.

From the viewpoint of achieving both flexibility of the adhesive and adhesiveness to the sheet, the adhesive 514 is preferably a hot melt adhesive. Hot melt adhesives include, for example, the various adhesives mentioned above, tackifiers such as petroleum resins and polyterpene resins, plasticizers such as paraffin oil, and, if necessary, phenol-based, amine-based, phosphorus-based, etc. It may contain an antioxidant such as benzimidazole.

According to the absorbent sheet 51 having the above configuration, the adhesive 514 present in the direct bonding portion 515 applies an appropriate bonding force between the fiber sheets 511 and 512 to the extent that the absorbent polymer 513 does not move or fall off. By developing the absorbent polymer 513, the absorbent polymer 513 can be supported at an appropriate position between the fiber sheets 511 and 512. In addition, since the absorbent polymer 513 exhibits an appropriate bonding force that is sufficient to swell, the liquid absorbency of the absorbent polymer 513 can be fully exhibited. According to a preferred embodiment of the present invention, since the adhesive 514 has elasticity, the adhesive 514 existing in the direct bonding area 515 due to swelling of the absorbent polymer 513 is elongated and the adhesion caused by this elongation. A force balance with the contraction of the agent 514 is likely to occur, and a bonding force capable of supporting the absorbent polymer 513 at an appropriate position and securing a space in which the absorbent polymer 513 can swell is efficiently developed. be able to. As a result, the liquid absorbency of the absorbent sheet 51 is further improved.

The adhesive 514 is preferably applied to the inner surfaces of both sheets 511 and 512, that is, the surfaces facing the absorbent polymer 513. With this configuration, the adhesive 514 applied to both sheets 511 and 512 is bonded to each other to efficiently form a bonding area 515 directly on the absorbent sheet 51, and the absorbent polymer 513 is supported at an appropriate position. It is possible to achieve both this and securing of a space in which the absorbent polymer 513 can swell. In addition, since the adhesive 514 can be made to exist easily in the voids between the fibers that make up both sheets 511 and 512, peeling at the interface between both sheets 511 and 512 and the adhesive 514 is less likely to occur. There is also the advantage of being

From the viewpoint of suppressing unintentional movement or falling off of the absorbent polymer 513 and further increasing the liquid absorption speed, as shown in FIGS. 6 and 7, the first fiber sheet 511 and the second fiber sheet 512 are The adhesive 514 is discontinuously applied to the bonding area so that there are non-applied areas, and the adhesive 514 is applied to the entire area of the bonding area between the second fiber sheet 512 and the first fiber sheet 511 with no gaps. It is preferable that the coating be applied continuously. In addition, the surface where the adhesive 514 is not present in the first fiber sheet 511, that is, the outer surface of the absorbent sheet 51 on the first fiber sheet 511 side, is the liquid receiving surface that is the surface where the absorbent sheet 51 and the liquid first come into contact. It is also preferable to use it as a surface. The bonding region is a region in which the absorbent polymer 513 is arranged in such a manner that no macroscopically visible gap is observed.

In the first fiber sheet 511, examples of the form in which the adhesive 514 is applied discontinuously so as to have non-applied portions include a spiral form, a summit form, an omega form, a curtain form, a stripe form, and the like. In this embodiment, the adhesive 514 applied to the first fiber sheet 511 has a spiral shape.
The thickness of the absorbent sheet 51 is, for example, 5 mm or less, more preferably 2 mm or less.
The proportion of particles of the absorbent polymer 513 in the absorbent sheet 51 (hereinafter also referred to as "SAP ratio") is, for example, preferably 60% by mass or more, more preferably 70% by mass or more, and even more preferably 95% by mass. % or less, more preferably 90% by mass or less.
According to such an absorbent sheet 51, the absorbent sheet 51 can be made thin while maintaining absorbent performance.

The SAP ratio is measured, for example, by the following method.
(1) Take out the absorbent sheet 51 from the diaper 1 in a certain area (for example, 9 cm ² to 100 cm ² ). In this case, care is taken to cut out the absorbent sheet 51 only at locations where macroscopically visible gaps between the absorbent polymers 513 are not observed.
(2) The absorbent sheet 51 is decomposed using a solvent that dissolves the adhesive, and the two fiber sheets 511 and 512 and the absorbent polymer 513 are separated.
(3) Measure the mass of the fiber sheets 511 and 512 and the mass of the absorbent polymer 513.
(4) Calculate the SAP ratio from the following formula.
SAP ratio = ((mass of absorbent polymer 513) / (mass of absorbent polymer 513 + mass of each fiber sheet 511, 512)) x 100

The thickness of the absorbent sheet 51 is measured using a KES-G5 handy compression tester manufactured by Kato Tech Co., Ltd. In detail, the absorbent sheet 51 was attached to the test stand of the measuring device, and the sample was compressed between plywood sheets having a circular plane with an area of 2 cm ² to give a pressure of 4.9 mN/cm ² (=0. A load of 5 gf/cm ² ) is applied. In this state, the thickness of the absorbent sheet 51 is measured. The compression speed is 0.5 mm/sec, and the maximum compression load is 490 mN/cm ² (=50 gf/cm ² ).

The structure of the absorbent sheet may be other than the structure described for the absorbent sheet 51. For example, there may be a sheet containing water-absorbing fibers that is sandwiched between sheets by pressure embossing instead of an adhesive.

Although the present invention has been described above based on its preferred embodiments, the present invention is not limited to such specific embodiments, and unless specifically limited in the above description, the present invention will not be limited to the scope of the claims. Various modifications and changes can be made within the scope of the spirit of the present invention.
For example, the dorsal extension portion may be rectangular in plan view, as shown in FIG. 12.
Further, the auxiliary layer 52 may be disposed over the entire region where the back elastic region X1 and the absorbent body 5 overlap in the horizontal direction Y when the diaper 1 is viewed in the vertical direction X.

Regarding the embodiments described above, the present invention further discloses the following pants-type absorbent article.
<1>
A ventral exterior body disposed on the ventral side of the wearer, a dorsal exterior body disposed on the dorsal side of the wearer, and these so as to bridge between the ventral exterior body and the dorsal exterior body. an absorbent main body fixed to an exterior body, the absorbent body having a longitudinal direction extending between the ventral exterior body and the dorsal exterior body, and a lateral direction perpendicular to the longitudinal direction, and having an absorbent main body fixed to the exterior body of the ventral exterior body; A pants-type absorbent article comprising a side seal portion formed by joining both side edges of the body and the back side exterior body,
The absorbent main body includes an absorbent body having an absorbent sheet including two same or different fiber sheets and absorbent polymer particles arranged between the fiber sheets,
The back side exterior body includes a back side extension portion extending downward from the lower end of the side seal portion,
The dorsal extension portion includes a dorsal stretchable region that is stretchable along the lateral direction,
When the absorbent article is viewed along the longitudinal direction, in a region where the back elastic region and the absorbent core overlap in the horizontal direction, the absorbent core has the absorbent material in the central region in the horizontal direction. Equipped with an auxiliary layer that overlaps with the sheet,
The pants-type absorbent article, wherein the central region has higher rigidity than side regions adjacent to the central region.

<2>
The dorsal elastic region can be expanded and contracted by an elastic member disposed in an expanded state along the lateral direction,
<1> above, wherein the elastic member is not arranged in the central region of the absorbent body, or if it is arranged in the central region, it is arranged in such a manner that it does not exhibit stretchability. The pants-type absorbent article described in .
<3>
The dorsal elastic region can be expanded and contracted by an elastic member arranged to draw a curve around the wearer's legs,
<1> above, wherein the elastic member is not arranged in the central region of the absorbent body, or if it is arranged in the central region, it is arranged in such a manner that it does not exhibit stretchability. The pants-type absorbent article described in .
<4>
The pants-type absorbent article according to any one of <1> to <3>, wherein the length of the back side extension portion in the lateral direction becomes shorter as it goes downward.
<5>
The pants-type absorbent article according to any one of <1> to <4>, wherein the auxiliary layer is made of a mixed fiber stack containing at least water-absorbing natural fibers and an absorbent polymer.
<6>
The absorbent main body includes a first elastic region extending in the longitudinal direction on both sides of the absorbent body,
The first elastic region extends beyond the end of the auxiliary layer on the back side exterior body side, or extends to the vicinity of the end of the auxiliary layer on the back side exterior body side. The pants-type absorbent article according to any one of <1> to <5>.

<7>
The absorbent main body includes a second stretchable region that extends in the longitudinal direction and can stand up toward the wearer's body, on the inner side of the first stretchable region in the lateral direction,
The second elastic region extends beyond the end of the auxiliary layer on the back side exterior body side, or extends to the vicinity of the end of the auxiliary layer on the back side exterior body side. The pants-type absorbent article according to <6>.
<8>
The first elastic region is formed of a pair of upright portions 50, 50, and the pair of upright portions extend beyond the end on the back side exterior body side. 7>.
<9>
The pants-type absorbent article according to <8>, wherein the bending starting point when the first standing portion performs the standing operation is formed by a corner of a side edge located in the lateral direction of the auxiliary layer.
<10>
The pants according to <7>, wherein the second elastic region has a second standing portion 82 that stands up on the wearer side, and the standing portion extends beyond the end on the back side exterior body side. Type absorbent article.
<11>
The second elastic region includes a base end portion that becomes a base end when the second standing portion stands up toward the wearer's skin,
The pants-type absorbent article according to <10>, wherein the positions of the side edge and the base end are the same when viewed in the lateral direction.

<12>
The auxiliary layer extends from the dorsal exterior body to the ventral exterior body,
The auxiliary layer according to any one of <1> to <11>, wherein the auxiliary layer has a widened portion where the length in the lateral direction increases from the dorsal exterior body to the ventral exterior body. Pants-type absorbent article.
<13>
The auxiliary layer has the widened portion at or near the lower edge of the ventral exterior body, and the lateral length of the auxiliary layer continuously increases in the widened portion. The pants-type absorbent article according to <12> above.
<14>
The ventral exterior body includes an elastic region around the abdomen that is stretchable in the lateral direction,
The pants-type absorbent article according to <11> or <13>, wherein the abdominal stretch region and the widened region overlap in a plan view of the absorbent article.
<15>
The auxiliary layer is fixed to the absorbent sheet so that the end portion on the dorsal exterior body side overlaps with the dorsal elastic region of the dorsal exterior body and the widened portion overlaps with the abdominal elastic region in plan view. The pants-type absorbent article according to <14> above.
<16>
The widened region is a region whose lateral length increases from the dorsal exterior body toward the ventral exterior body, and the width thereof is longer than the width of the end portion on the dorsal exterior body side. The pants-type absorbent article according to <14> or <15> above.

<17>
The auxiliary layer has a single or multiple low-rigidity region extending in the longitudinal direction and having lower rigidity than other regions in the auxiliary layer,
The pants-type absorbent article according to any one of <1> to <16>, wherein the low-rigidity region does not reach the dorsal elastic region.
<18>
The pants-type absorbent article according to <17>, wherein the low-rigidity region extends forward beyond the lower edge of the ventral exterior body.
<19>
One end of the low-rigidity region located on the side of the ventral exterior body extends forward beyond the lower end edge of the ventral exterior body to a position overlapping with the abdominal expansion/contraction region, and the low-rigidity region located on the side of the dorsal exterior body extends forward beyond the lower edge of the ventral exterior body to a position overlapping with the abdominal circumference elastic region. The pants-type absorbent article according to <17> or <18>, wherein the other end of the part does not reach the back side exterior body.
<20>
The absorbent body has a multilayer structure in which the central region including the auxiliary layer is made of the absorbent sheet and the auxiliary layer, and the side regions adjacent to the central region are made of the absorbent sheet alone. The pants-type absorbent article according to any one of <1> to <19> above, which has a single-layer structure.
<21>
The auxiliary layer has a length L from the end on the dorsal exterior body side to the ventral end on the opposite side, and the length L from one side edge located in the lateral direction to the other side edge located in the lateral direction. The pants-type absorbent article according to any one of <1> to <20>, which is longer than the length of the absorbent article.

<22>
The absorber is arranged such that the end on the dorsal exterior body side is located approximately at the center of the dorsal elastic region of the dorsal extension in the longitudinal direction, and the ventral end is located near the longitudinal center line. The pants-type absorbent article according to <21> above, which is disposed on a flexible sheet.
<23>
The pants-type absorbent according to <22>, wherein the lower end of the side seal part, which is the starting position of the dorsal elastic region, and the end of the dorsal exterior body side are aligned along the longitudinal direction. Sex items.
<24>
The absorbent polymer according to any one of <1> to <23>, wherein in the absorbent polymer arrangement region of the absorbent sheet, the absorbent polymer is arranged in such a manner that macroscopically visible gaps are not observed. pants-type absorbent article.
<25>
In the area where the absorbent polymer is arranged, the first fiber sheet and the second fiber sheet have a portion directly joined with an adhesive without using the absorbent polymer, according to <24>. Pants-type absorbent article.
<26>
According to <25>, the directly joined portions are formed in a plurality of regular or irregular dots when the absorbent sheet is viewed in the sheet plane direction. Pants-type absorbent article.

<27>
The adhesive is discontinuously applied to the bonding area of the first fiber sheet with the second fiber sheet so as to have non-applied areas, and the adhesive is discontinuously applied to the bonding area of the first fiber sheet with the first fiber sheet. The pants-type absorbent article according to any one of <1> to <26>, wherein the adhesive is continuously applied to the entire region without gaps.
<28>
The proportion of absorbent polymer particles in the absorbent sheet is preferably 60% by mass or more, more preferably 70% by mass or more, still more preferably 95% by mass or less, more preferably 90% by mass or less. The pants-type absorbent article according to any one of <1> to <27>.

1, 1A Pants-type absorbent article 2 Absorbent main body 3A Ventral exterior body 3Aa Lower edge of ventral exterior body 3B, 3C Dorsal exterior body 5 Absorbent body 5A Central region 5B Side region 39 Dorsal side extension portion 43 Curve Elastic member 47 Elastic member 50 Standing portion 51 Absorbent sheet 52, 152 Auxiliary layer 52d End portion of auxiliary layer 82 Second elastic region (standing portion)
153 Widened portion 511, 512 Two fiber sheets 513 Absorbent polymer 525 Low rigidity portion AS, BS Side edge S Side seal portion Sa Lower end of side seal portion direction

Claims (12)

A ventral exterior body disposed on the ventral side of the wearer, a dorsal exterior body disposed on the dorsal side of the wearer, and these so as to bridge between the ventral exterior body and the dorsal exterior body. an absorbent main body fixed to an exterior body, the absorbent body having a longitudinal direction extending between the ventral exterior body and the dorsal exterior body, and a lateral direction perpendicular to the longitudinal direction, and having an absorbent main body fixed to the exterior body of the ventral exterior body; A pants-type absorbent article comprising a side seal portion formed by joining both side edges of the body and the back side exterior body,
The absorbent main body includes an absorbent body having an absorbent sheet including two same or different fiber sheets and absorbent polymer particles arranged between the fiber sheets,
The back side exterior body includes a back side extension portion extending downward from the lower end of the side seal portion,
The dorsal extension portion includes a dorsal stretchable region that is stretchable along the lateral direction,
When the pants-type absorbent article is viewed along the longitudinal direction, in the region where the back elastic region and the absorbent core overlap in the horizontal direction, the absorbent core has the Equipped with an auxiliary layer that overlaps with the absorbent sheet,
The central region has higher rigidity than the side regions adjacent to the central region,
A pants-type absorbent article , wherein the width of the auxiliary layer in the lateral direction is smaller than the width of the absorbent sheet in the lateral direction over the entire length of the auxiliary layer in the longitudinal direction. The dorsal elastic region can be expanded and contracted by an elastic member disposed in an expanded state along the lateral direction,
2. The elastic member according to claim 1, wherein the elastic member is not arranged in the central region of the absorbent body, or if it is arranged in the central region, it is arranged in such a manner that it does not exhibit stretchability. The pants-type absorbent article described above. The dorsal elastic region can be expanded and contracted by an elastic member arranged to draw a curve around the wearer's legs,
2. The elastic member according to claim 1, wherein the elastic member is not arranged in the central region of the absorbent body, or if it is arranged in the central region, it is arranged in such a manner that it does not exhibit stretchability. The pants-type absorbent article described above. The pants-type absorbent article according to any one of claims 1 to 3, wherein the length of the back side extension portion in the lateral direction becomes shorter as it goes downward. The pants-type absorbent article according to any one of claims 1 to 4, wherein the auxiliary layer is made of a mixed fiber stack containing at least water-absorbing natural fibers and an absorbent polymer. The absorbent main body includes a first elastic region extending in the longitudinal direction on both sides of the absorbent body,
The first elastic region extends beyond the end of the auxiliary layer on the back side exterior body side, or extends to the vicinity of the end of the auxiliary layer on the back side exterior body side. The pants-type absorbent article according to any one of Items 1 to 5. The absorbent main body includes a second stretchable region that extends in the longitudinal direction and can stand up toward the wearer's body, on the inner side of the first stretchable region in the lateral direction,
The second elastic region extends beyond the end of the auxiliary layer on the back side exterior body side, or extends to the vicinity of the end of the auxiliary layer on the back side exterior body side. Item 6. The pants-type absorbent article according to item 6. The auxiliary layer extends from the dorsal exterior body to the ventral exterior body,
The pants type according to any one of claims 1 to 7, wherein the auxiliary layer has a widened portion where the length in the lateral direction increases from the dorsal exterior body toward the ventral exterior body. Absorbent articles. The auxiliary layer has the widened portion at or near the lower edge of the ventral exterior body, and the lateral length of the auxiliary layer continuously increases in the widened portion. The pants-type absorbent article according to claim 8. The ventral exterior body includes an elastic region around the abdomen that is stretchable in the lateral direction,
The pants-type absorbent article according to claim 8 or 9, wherein the abdominal stretch region and the widened region overlap in a plan view of the pants-type absorbent article. The auxiliary layer has a single or multiple low-rigidity region extending in the longitudinal direction and having lower rigidity than other regions in the auxiliary layer,
The pants-type absorbent article according to any one of claims 1 to 10, wherein the low-rigidity region does not reach the dorsal elastic region. The pants-type absorbent article according to claim 11, wherein the low-rigidity region extends beyond the lower edge of the ventral exterior body.