JP2023001810A - absorbent article - Google Patents

Abstract

To provide an absorbent article that is good in comfort and appearance during wearing.SOLUTION: An absorbent body 5 is divided, in the lengthwise direction X, into a high-stiffness region 51 and a low-stiffness region 52 that have differing stiffness in the lengthwise direction X, and the high-stiffness region 51 includes a region having higher stiffness in the lengthwise direction X in comparison to the low-stiffness region 52. Elastic members 53 extending in the lengthwise direction X are disposed, so as to be capable of stretching and contracting in the lengthwise direction X, on opposing side portions of the absorbent body 5 along the lengthwise direction X in at least a crotch section M. In an unfolded and fully-extended absorbent article 1, both ends, in the lengthwise direction X, of the portions of the elastic members 53 that can stretch and contract in the lengthwise direction X are present in the high-stiffness region 51 or outside the high-stiffness region 51 in the transverse direction Y.SELECTED DRAWING: Figure 5

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorbent article in which both sides of an absorbent body can stand up when worn.

2. Description of the Related Art Absorbent articles such as disposable diapers are known that have an absorbent body that has a longitudinal direction corresponding to the front-rear direction of a wearer and a lateral direction orthogonal to the longitudinal direction and that absorbs and retains body fluids. In Patent Document 1, in a disposable diaper having such a configuration, elastic members are arranged so as to be stretchable on both sides along the longitudinal direction of the absorbent body, and when the elastic members are contracted when worn, both sides of the absorbent body are stretched. is configured to stand against the wearer's skin. Since both sides of the absorbent body stand up when worn, the appearance of the diaper when worn is improved, and it can be expected that the ease of movement of the wearer will be improved and the comfort during wearing will be enhanced. The absorber provided in the diaper described in Patent Document 1 is made by holding a water-absorbing polymer in a fiber assembly made of pulp fibers or the like, and the portion from the abdominal part to the crotch part of the diaper has a two-layer structure, The dorsal part has a single layer structure, and the layer structure is different in the longitudinal direction.

JP-A-2006-341061

When contractible elastic members are placed in the vicinity of the absorbent article for the purpose of standing up both sides along the longitudinal direction of the absorbent body, contraction of the elastic members causes irregular wrinkles in the absorbent body, making it difficult to wear. There is a concern that the appearance of the absorbent article may deteriorate at times, and inconveniences such as unexpected leakage due to deterioration of fit may occur. In particular, when a relatively thin, flexible, and low-rigidity absorbent body is introduced into an absorbent article for the purpose of improving wearing comfort, etc., irregular wrinkles due to contraction of the elastic member are remarkably generated. Therefore, it has been difficult to reduce the thickness of the absorbent body in an absorbent article in which both sides of the absorbent body can stand up when worn.

Accordingly, an object of the present invention is to provide an absorbent article that is comfortable to wear and has good appearance when worn.

The present invention has an abdominal portion arranged on the abdomen side of the wearer when worn, a dorsal portion arranged on the back side of the wearer, and a crotch portion located therebetween, and from the abdominal portion to the crotch portion. The absorbent article has a longitudinal direction extending to the dorsal portion through a portion and a lateral direction orthogonal to the longitudinal direction, and includes an absorbent body that absorbs and retains body fluids.
In one embodiment of the absorbent article of the present invention, the absorbent body includes, in the longitudinal direction, a high-rigidity region having relatively high stiffness in the longitudinal direction and a low-rigidity region having relatively low stiffness in the longitudinal direction. and the high stiffness region includes a region having a higher longitudinal stiffness than the low stiffness region.
In one embodiment of the absorbent article of the present invention, elastic members extending in the longitudinal direction are arranged so as to be stretchable in the longitudinal direction at least on both sides of the absorbent body in the crotch portion along the longitudinal direction. there is
In one embodiment of the absorbent article of the present invention, in the absorbent article in the unfolded and maximally stretched state, both longitudinal ends of the longitudinally stretchable portion of the elastic member are the high-rigidity regions or Exists laterally outward of the high stiffness region.
Other features, advantages and embodiments of the invention are described below.

The absorbent article of the present invention is comfortable to wear and has good appearance when worn. That is, the absorbent article of the present invention is configured so that both sides of the absorbent body can stand up when worn, and the elastic member introduced to allow the standing up of the absorbent body is caused by the contraction of the absorbent body. Since the occurrence of irregular wrinkles in the absorbent body is suppressed, the wearer can comfortably spend time without hindrance to movement, and the appearance when worn is neat and no irregular wrinkles can be seen on the absorber. The appearance of the worn state is good.

FIG. 1 is a perspective view schematically showing the natural state of an underpants-type disposable diaper, which is one embodiment of the absorbent article of the present invention. FIG. 2 is a developed plan view schematically showing the side facing the skin (the top sheet side) of the diaper shown in FIG. 1 in the developed and maximum stretched state. FIG. 3 is a cross-sectional view schematically showing the II line cross section of the diaper shown in FIG. 2 (the cross section along the thickness direction and the lateral direction). 4 is a cross-sectional view schematically showing the natural state of the diaper shown in FIG. 3. FIG. 5 is a plan view schematically showing the positional relationship between the absorber and the elastic member in FIG. 2. FIG. FIG. 6 is a view equivalent to FIG. 5 of another embodiment of the absorbent body according to the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described based on its preferred embodiments with reference to the drawings. In addition, in the following description of the drawings, the same or similar reference numerals are given to the same or similar parts. The drawings are basically schematic, and the ratio of each dimension may differ from the actual one.

1 to 5 show an underpants-type disposable diaper 1 that is one embodiment of the absorbent article of the present invention. The diaper 1 has an abdominal portion F arranged on the abdomen side of the wearer when worn, a dorsal portion R arranged on the dorsal side of the wearer, and a position between the abdominal portion F and the dorsal portion R. It has a crotch part M that extends from the abdominal part F to the back part R via the crotch part M, and has a longitudinal direction X corresponding to the front and back direction of the wearer and a lateral direction Y orthogonal to the longitudinal direction X. have The diaper 1 also includes an absorbent body 5 that absorbs and retains bodily fluids.

The crotch portion M extends in the longitudinal direction X across the longitudinal center line CLx of the diaper 1 . The vertical center line CLx is an imaginary straight line extending in the horizontal direction Y by halving the diaper 1 in the unfolded and maximum stretched state as shown in FIG.
The crotch part M includes an excretory part facing part (not shown) that faces the wearer's excretory part such as the penis, and is typically the part of the diaper 1 where the length (width) in the lateral direction Y is the shortest. include.
In the present invention, the abdominal portion F, the crotch portion M, and the back portion R can be regions when the absorbent article in the unfolded and maximally stretched state is divided into three equal parts in the longitudinal direction X.

As used herein, the term “unfolded and maximally stretched state” means that the absorbent article is flattened into a flattened state, the elastic members of each part of the absorbent article in the expanded state are stretched to the maximum, and the design dimensions, i.e., the It refers to the state in which the dimension is the same as the dimension when it is flattened in a state where the influence of the elastic member is completely eliminated. In the case of an absorbent article having side seal portions, the absorbent article is cut off at the side seal portions and spread flat to form the expanded state.

In this embodiment, the diaper 1 is formed symmetrically on one side and the other side with respect to the horizontal center line CLy in the unfolded and maximum stretched state as shown in FIG. The horizontal center line CLy is an imaginary straight line that extends in the vertical direction X and bisects the diaper 1 in the unfolded and maximum stretched state in the horizontal direction Y. As shown in FIG.
The diaper 1 includes an absorbent body 2 including an absorbent body 5 and an outer body 10 arranged on the non-skin facing side of the absorbent body 2 . The absorbent main body 2 and the exterior body 10 are joined by a known joining means such as an adhesive.
The outer body 10 is a member that forms the outer shape of the diaper 1 . Peripheral edges of the outer body 10 form outlines of the abdominal portion F and the dorsal portion R of the diaper 1, respectively. The exterior body 10 extends in the lateral direction Y and is located in the ventral part F, and the ventral exterior body 10F is located in the ventral part F. Separately from this, the dorsal exterior body 10R extends in the lateral direction Y and is located in the dorsal part R. and That is, the diaper 1 is a so-called split-type underpants-type disposable diaper in which the exterior body is divided into a member arranged on the abdomen side and a member arranged on the back side.
The absorbent main body 2 has a rectangular shape in a plan view, and is arranged in the central portion of the outer package 10 in the lateral direction Y with its longitudinal direction aligned with the longitudinal direction X of the diaper 1, and extends from the abdominal portion F to the dorsal portion R. It extends in the longitudinal direction X over the entire length, and bridges between the ventral exterior body 10F and the dorsal exterior body 10R which are arranged at a predetermined interval in the longitudinal direction X.

As used herein, the term “skin-facing surface” refers to the surface of an absorbent article or its constituent members (e.g., absorbent body) that faces the wearer's skin when the absorbent article is worn, that is, the surface facing the wearer's skin. The "non-skin facing surface" is the side of the absorbent article or its constituent members that faces away from the skin when the absorbent article is worn, i.e., the side that is relatively far from the wearer's skin. on the side. It should be noted that the term "when worn" as used herein means a state in which the absorbent article is maintained in a normal and appropriate wearing position, that is, in a correct wearing position of the absorbent article.

In the diaper 1, as shown in FIG. 1, a pair of side seal portions are formed by joining both side portions of the ventral exterior body 10F along the longitudinal direction X and both side portions of the dorsal exterior body 10R along the longitudinal direction X to each other. S, S are formed. Thereby, the exterior bodies 10F and 10R are connected in a ring. The side seal portion S is formed by a known joining means such as adhesive, heat sealing, ultrasonic sealing, or the like. The diaper 1 also has a waist opening WH through which the wearer's torso is passed, and a pair of leg openings LH and LH through which the wearer's lower legs are passed.

The absorbent main body 2 consists of a liquid-permeable surface sheet 3 arranged at a position relatively close to the wearer's skin and a liquid-impermeable or liquid-impermeable surface sheet 3 arranged at a position relatively far from the wearer's skin. It comprises a permeable or water-repellent back sheet 4 and an absorbent body 5 interposed between the two sheets 3,4. These members constituting the absorbent main body 2 are integrated by a known joining means such as an adhesive. As the top sheet 3 and the back sheet 4, those commonly used in absorbent articles of this type can be used without particular limitation. As the surface sheet 3, various liquid-permeable sheets can be used, such as nonwoven fabric, woven fabric, and paper. As the back sheet 4, a sheet having a leakproof property, specifically, a liquid-impermeable (absolutely liquid-impermeable) or liquid-impermeable (although it cannot be said to be liquid-impermeable, it is difficult for liquid to pass through). properties), and examples thereof include a moisture-permeable resin film and a laminate of the resin film and a nonwoven fabric.

In the present embodiment, as shown in FIG. 2, the absorbent body 5 has a shape elongated in one direction, such as a rectangular shape in plan view, and is arranged so that its longitudinal direction coincides with the longitudinal direction X of the diaper 1. ing. The absorber 5 is arranged at least in the crotch portion M. In the diaper 1, the absorber 5 is continuous from the abdominal portion F to the back portion R via the crotch portion M.
3 and 4, the topsheet 3 traverses the side of the absorbent body 5 facing the skin in the horizontal direction Y, and from both side edges of the topsheet 3 along the vertical direction X of the absorbent body 5 is wound around the non-skin facing surface side of the absorbent body 5 (more specifically, the second core 7 described later). The pair of extending portions of the surface sheet 3 are respectively fixed to a cuff sheet 80 forming the main body of the leak-proof cuff 8 described later, and a pair of fixing portions 83 are formed between the surface sheet 3 and the cuff sheet 80. It is The surface sheet 3 does not cover the entire 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 (the portion located between the pair of fixing portions 83, 83). ) is not covered with the top sheet 3 . In this embodiment, the surface sheet 3 thus has a size capable of covering the entire skin-facing surface of the absorbent body 5, and covers the skin-facing surface of the absorbent body 5 and both sides of the absorbent body 5 along the longitudinal direction X. The edges are covered over their entire area, and furthermore, a predetermined range is covered inward in the lateral direction Y from the both side edges of the non-skin-facing surface of the absorbent body 5 . In addition, unlike the illustrated embodiment, the surface sheet 3 covers the skin facing surface of the absorbent body 5, but does not need to cover the non-skin facing surface of the absorbent body 5. FIG.

As described above, the outer covering 10 of the diaper 1 includes the abdominal outer covering 10F and the back outer covering 10R, which are members independent of each other. The abdomen-side exterior body 10F has a rectangular shape elongated in the horizontal direction Y in the unfolded and maximum stretched state of the diaper 1 shown in FIG. In the same state, the back exterior body 10R has a rectangular shape elongated in the horizontal direction Y at the end region in the longitudinal direction X farther from the longitudinal center line CLx, and the end in the longitudinal direction X at the side closer to the longitudinal center line CLx. The region has a shape in which the length (width) in the lateral direction Y gradually decreases toward the longitudinal center line CLx.
The outer layer sheet 11 is arranged at a position relatively distant from the absorbent body 5 and forms the outer surface of the diaper 1, and the outer layer sheet 11 is arranged at a position relatively close to the absorbent body 5 and forms the inner surface of the diaper 1. It is configured including an inner layer sheet 12 . Both sheets 11 and 12 are bonded together and integrated by known bonding means such as heat sealing and ultrasonic sealing.
A plurality of waist gather forming elastic members 13 extending in the width direction Y are intermittently arranged in the longitudinal direction X between the outer layer sheet 11 and the inner layer sheet 12 in the ventral portion F and the back portion R. Further, a leg gather forming elastic member 14 is arranged between the outer layer sheet 11 and the inner layer sheet 12 at the opening edges of each of the pair of leg openings LH, LH. Both elastic members 13 and 14 are fixed at predetermined positions in a stretched state and are arranged so as to be stretchable.
Both the sheets 11 and 12 forming the exterior body 10 may be sheets of the same type, or may be sheets of a different type. The sheets 11, 12 may be stretchable, in particular stretchable in the lateral Y direction. As the sheets 11 and 12, nonwoven fabrics produced by various manufacturing methods, laminates of nonwoven fabrics and resin films, and the like can be used.

In this embodiment, as shown in FIGS. 2 to 4, the diaper 1 includes a pair of leak-proof diapers arranged along both sides of the absorber 5 along the longitudinal direction X from the ventral side F to the dorsal side R. It has cuffs 8,8. The leak-preventing cuff 8 includes a cuff sheet 80 that forms the main body of the leak-preventing cuff 8 and one or more cuff elastic members 81 that are fixed to the cuff sheet 80 and extendable in the longitudinal direction X. The leakage-preventing cuffs 8 (cuff sheets 80 ) are arranged continuously along the sides along the longitudinal direction X of the absorbent main body 2 over substantially the entire length in the longitudinal direction X of the absorbent main body 2 .
Each of the pair of leak-proof cuffs 8, 8 has an upright part 82 at least in the crotch part M that stands up against the wearer's skin when worn. The standing portion 82 stands up toward the wearer's skin with the fixed portion 83 as a standing point. The standing portions 82 are portions of the cuff sheet 80 that are not fixed to other members. The fixed portion 83 is a portion where the cuff sheet 80 is fixed to another member by a known joining means such as adhesive or fusion. As the cuff sheet 80, any material that is used as a material for leak-proof cuffs in this type of absorbent article can be used without particular limitation. can be used.

As shown in FIG. 2, at both ends of the leak-proof cuff 8 in the longitudinal direction X, erection inhibiting portions 84, which are portions where the cuff sheet 80 is inhibited from being erected, are formed. The erection-inhibiting portion 84 is formed in the ventral portion F and the dorsal portion R, and the portion along the vertical direction X sandwiched between the erection-inhibiting portions 84 , 84 is the erecting portion 82 . The erection inhibiting portion 84 is typically formed by fixing the cuff sheet 80 to the skin-facing surface (topsheet 3) of the absorbent body 2, and the fixing portion is formed by a known joining means such as an adhesive or fusion. can be formed. A pair of standing-up inhibiting portions 84, 84 are formed at both ends of the leakage-preventing cuff 8 in the longitudinal direction X, so that when the diaper 1 is worn, the portion sandwiched between the standing-up inhibiting portions 84, 84 is prevented from standing up. Due to the contraction of the cuff elastic member 81, the portion 82 stands up toward the wearer's skin with the fixed portion 83 as a starting point, as shown in FIG. In such an upright state of the leakage-preventing cuff 8, the upright upright portion 82 prevents the wearer's bodily fluids, such as urine, from moving outward in the lateral direction Y. Outward leakage in the lateral direction Y (lateral leakage) is effectively suppressed. In addition, although not shown, when the leak-proof cuff 8 is in an upright state, contraction of the cuff elastic member 81 causes the diaper 1 as a whole to move toward the non-skin-facing side ( Since the diaper 1 is curved and deformed so as to be convex toward the back sheet 4 side), the diaper 1 can easily fit the shape of the wearer's body.

The absorbent body 5, which is one of the characteristic structures of the diaper 1, will be described below.
In this embodiment, the absorbent body 5 is configured including an absorbent sheet 70 . The absorbent sheet 70 includes a base sheet 71 and a water absorbent polymer 72 placed on the surface of the base sheet 71 . In addition, in this embodiment, the absorbent body 5 includes an absorbent sheet 70 and an auxiliary absorbent layer 60 arranged so as to partially overlap with the absorbent sheet 70 in the thickness direction.
More specifically, in the present embodiment, the absorbent body 5 is arranged on the side farther from the wearer's skin than the first core 6 and the first core 6, and is part of the skin-facing surface of the first core 6. The first core 6 consists of the auxiliary absorbent layer 60 and the second core 7 consists of the absorbent sheet 70 .

In this embodiment, the auxiliary absorbent layer 60 (first core 6) is mainly composed of a fiber assembly and contains two or more types selected from synthetic fibers, water-absorbing natural fibers, and water-absorbing polymers. By configuring the first core 6 in this manner, the absorbent body 5 can have practically sufficient liquid absorption performance. The auxiliary absorbent layer 60 mainly composed of such a fiber assembly can be manufactured according to a conventional method using a conventionally known fiber stacking device.
The synthetic fibers may be hydrophilic or hydrophobic. Hydrophilic synthetic fibers are useful for improving the liquid absorption performance of the auxiliary absorbent layer 60, and hydrophobic synthetic fibers are useful for improving the shape retention of the auxiliary absorbent layer 60 after absorbing liquid. Hydrophilic synthetic fibers include, for example, polyvinyl alcohol fibers, polyacrylonitrile fibers, and hydrophobic synthetic fibers that have undergone hydrophilization treatment. Hydrophobic synthetic fibers include, for example, polyethylene terephthalate fibers, polyethylene fibers, polypropylene fibers, polyester fibers and the like.
Examples of the water-absorbing natural fibers include cellulose fibers. Cellulose fibers include, for example, wood pulp such as softwood pulp and hardwood pulp; natural fibers such as non-wood pulp such as cotton pulp and hemp pulp; modified pulp such as cationized pulp and mercerized pulp; regenerated cupra and rayon. A fiber etc. are mentioned.
As the water-absorbent polymer, those conventionally used in this type of absorber can be used without particular limitation, and examples thereof include polymers or copolymers of acrylic acid or alkali metal salts of acrylic acid. The water-absorbing polymer contained in the auxiliary absorbent layer 60 is typically particulate, fibrous, or other small pieces of water-absorbing polymer.
Although the basis weight of the auxiliary absorbent layer 60 (first core 6) is not particularly limited, it is preferably 200 g/m ² or more, more preferably 250 g/m 2 or more, from the viewpoint of the balance between the liquid absorption performance of the diaper 1 and the feeling of wearing. m ² or more, and preferably 450 g/m ² or less, more preferably 400 g/m ² or less. The term "basis weight of the auxiliary absorbent layer 60" as used herein refers to the basis weight including all the materials (fibers, water-absorbent polymer, etc.) forming the auxiliary absorbent layer 60. As shown in FIG.

The absorbent sheet 70 (second core 7) has a structure in which a particulate water-absorbing polymer 72 is interposed between base sheets 71, 71 arranged opposite to each other in the thickness direction, and a fiber assembly is formed. Compared to the main auxiliary absorbent layer 60 (first core 6), it is characterized by being thinner and more flexible.
As the base sheet 71, a liquid-permeable sheet is preferable, and for example, paper, nonwoven fabric, or the like can be used. As the water-absorbent polymer, which is the raw material of the water-absorbent polymer 72, those conventionally used in this type of absorber can be used without particular limitation, and the same one used in the first core 6 may be used. In the second core 7, the base sheets 71, 71 and the base sheet 71 and the water-absorbing polymer 72 may be bonded together with an adhesive. Although the content of the water-absorbing polymer in the second core 7 is not particularly limited, it is preferably 80% by mass or more with respect to the total mass of the second core 7 from the viewpoint of further strengthening the above characteristics.

Both the cores 6 and 7 (auxiliary absorbent layer 60 and absorbent sheet 70) constituting the absorbent body 5 are each covered with a core wrap sheet (not shown) on the skin facing surface and/or the non-skin facing surface. good too. In that case, both cores 6 and 7 may be individually covered with a core wrap sheet, or both cores 6 and 7 may be integrally covered with a core wrap sheet. As the core wrap sheet, a liquid-permeable sheet is preferable, and for example, paper, nonwoven fabric, or the like can be used. Note that the core wrap sheet is a constituent member of the absorbent body 5 .

In this embodiment, as shown in FIG. 5, the ventral side end 6F and the dorsal side end 6R of the auxiliary absorbent layer 60 (first core 6) in the longitudinal direction X are the longitudinal ends of the absorbent sheet 70 (second core 7). Arranged between the abdominal end 7F and the dorsal end 7R in the direction X, the auxiliary absorbent layer 60 is shorter in the longitudinal direction X than the absorbent sheet 70 . Further, in this embodiment, the auxiliary absorbent layer 60 is biased toward the ventral portion F side.

In this embodiment, as shown in FIG. 5, the auxiliary absorbent layer 60 (first core 6) has a narrow portion 62 having a relatively short length (width) in the horizontal direction Y in the crotch portion M. It also has a wide portion 61 with a relatively long length (width) in the lateral direction Y on the abdomen side of the wearer rather than the narrow portion 62 . A portion of the wide portion 61 near the narrow portion 62 (width changing portion 61B) gradually increases in width from the wearer's dorsal side to the ventral side. More specifically, the auxiliary absorbent layer 60 (first core 6) has a wide portion 61 on the ventral end 6F side and a narrow portion 62 on the dorsal end 6R side. The side is a constant width portion 61A whose width is constant over the entire length in the vertical direction X, and the narrow width portion 62 side is a width changing portion 61B whose width is not constant.

On the other hand, the absorbent sheet 70 (second core 7) has a rectangular shape in plan view as shown in FIG. It is longer than that of the wide portion 61 . In this embodiment, the second core 7 forms a contour line of the absorber 5 in plan view.
The second core 7 has a pair of extensions 7</b>E, 7</b>E extending outward in the lateral direction Y from side edges along the longitudinal direction X of the first core 6 . The extending portion 7E of the second core 7 stands up toward the wearer's skin when the diaper 1 is worn by contraction of the absorber elastic member 53, which will be described later. From the viewpoint of ensuring that the function and effect (improvement of wearing comfort and wearing appearance, etc.) due to the erection of the extending portion 7E of the second core 7 are ensured, the extending portion 7E should be present at least in the crotch portion M. is preferred, and in the present embodiment, it is present not only in the crotch portion M, but also in portions near the crotch portion M of the ventral portion F and the back portion R, respectively.

As shown in FIGS. 2 and 5, the absorbent body 5 has, in the vertical direction X, a high-rigidity region 51 and a low-rigidity region 52 having mutually different rigidity in the vertical direction X (hereinafter also referred to as "longitudinal rigidity"). classified. A boundary between the high-rigidity region 51 and the low-rigidity region 52 is a single imaginary straight line extending parallel to the horizontal direction Y. As shown in FIG.
The high-rigidity region 51 includes a region with higher longitudinal rigidity than the low-rigidity region 52 . When the longitudinal stiffness of the low-rigidity region 52 is partially different, the high-rigidity region 51 includes a region with higher longitudinal stiffness than the region with the highest longitudinal stiffness in the low-rigidity region 52 .
In the present invention, the high-rigidity region 51 may be a region whose longitudinal rigidity is higher than that of the low-rigidity region 52 in its entirety, or may be a region whose vertical rigidity is higher than that of the low-rigidity region 52. There may be. On the premise that the high-rigidity region 51 includes a region with a higher vertical stiffness than the low-rigidity region 52, the high-rigidity region 51 includes a region whose vertical stiffness is equal to that of the low-rigidity region 52 or lower than that of the low-rigidity region 52. good too.

In the present embodiment, as described above, the absorbent body 5 includes an absorbent sheet 70 as the second core 7 and an auxiliary absorbent sheet as the first core 6 arranged so as to partially overlap the absorbent sheet 70 in the thickness direction. The high-rigidity region 51 is defined as “a region overlapping the auxiliary absorbent layer 60 in plan view” and “a region located outside the auxiliary absorbent layer 60 in the lateral direction Y in the absorbent body 5”. The low-rigidity region 52 is "a region that does not overlap with the auxiliary absorbent layer 60 in the longitudinal direction X in the absorbent body 5". In other words, in the absorbent body 5, the high-rigidity region 51 is a region that overlaps the projection image of the auxiliary absorbent layer 60 in the lateral direction Y, and the low-rigidity region 52 is a region that does not overlap the projection image.
The above-mentioned "region having higher longitudinal rigidity than the low-rigidity region 52" of the high-rigidity region 51 is a region overlapping the auxiliary absorbent layer 60 in a plan view, and has an absorbent property of the auxiliary absorbent layer 60 (first core 6). Since it includes a laminated structure with the sheet 70 (second core 7), it has a higher basis weight than the low-rigidity region 52 made of the absorbent sheet 70, and therefore has a higher longitudinal rigidity than the low-rigidity region 52, It is difficult to bend in the vertical direction X. In addition, since the region of the high-rigidity region 51 located outside the auxiliary absorbent layer 60 in the lateral direction Y is composed of the absorbent sheet 70 (extending portion 7E), the longitudinal stiffness of this region is the same as the longitudinal stiffness of the low-rigidity region 52 . Same as stiffness. That is, in the present embodiment, the high-rigidity region 51 includes both a region having a higher vertical stiffness than that of the low-rigidity region 52 and a region having the same vertical stiffness. Further, in this embodiment, the longitudinal rigidity of the low-rigidity region 52 is substantially uniform over its entire area.
In the present embodiment, as will be described later, the auxiliary absorbent layer 60 has recesses 63 formed of through holes penetrating through it in the thickness direction. , and does not have high longitudinal rigidity compared to the low-rigidity region 52 (region made of the absorbent sheet 70).

As shown in FIGS. 2 and 5 , absorber elastic members 53 extending in the longitudinal direction X are arranged so as to be stretchable in the longitudinal direction X on both side portions along the longitudinal direction X of the absorber 5 at least in the crotch portion M. It is
In this embodiment, as shown in FIGS. 3 and 4, both side edges along the longitudinal direction X of the second core 7 (absorbent sheet 70) that form the outline of the absorbent body 5 in a plan view or the vicinity thereof (specifically, Specifically, for example, the absorbent elastic member 53 is arranged in a region within 10 mm from the side edge along the longitudinal direction X of the second core 7 . The absorber elastic member 53 is disposed between the second core 7 and the surface sheet 3, or when the skin-facing surface of the second core 7 is covered with the core wrap sheet, the core wrap sheet A core wrap sheet disposed between the sheet and the top sheet 3 and stretchable in the longitudinal direction X, covering at least the second core 7 or its skin-facing surface, and the top sheet 3 , is fixed by a known fixing means such as an adhesive. The absorber elastic member 53 may be one per one side edge of the absorber 5 as shown in the drawing, or may be plural.
When the outer surface of the second core 7 is covered with the core wrap sheet, the absorbent elastic member 53 is arranged so as to be stretchable in the longitudinal direction X between the second core 7 and the core wrap sheet. In that case, the absorbent elastic member 53 may be fixed to one or both of the second core 7 and the core wrap sheet by a known fixing method such as an adhesive.
As materials for various elastic members in the diaper 1, including the absorbent body elastic member 53 and the cuff elastic member 81, unless otherwise specified, various known elastic materials commonly used in this type of absorbent article can be used. Materials can be used without particular limitations. As for the shape of the elastic member, it is preferable to use a thread-like (string rubber, etc.) or string-like (flat rubber, etc.) having a rectangular, square, circular, polygonal cross section, etc., or a multi-filament type thread-like one. can.

In the diaper 1, the absorbent body elastic members 53 are thus fixed in a stretched state to both sides (both ends in the lateral direction Y) of the absorbent body 5 (more specifically, the second core 7) along the longitudinal direction X. Therefore, in the natural state of the diaper 1, as shown in FIG. The pair of extending portions 7E, 7E serve as absorbent body standing portions that stand up against the wearer's skin due to contraction of the absorbent body elastic member 53. As shown in FIG. At this time, the second core 7 has a bottom portion at a central portion in the lateral direction Y overlapping with the first core 6 (auxiliary absorbent layer 60), and a pair of extending portions 7E extending obliquely from the bottom portion toward the wearer's skin. It has a tray shape with 7E (absorbent body standing portion) as a side portion. The second core 7 also deforms when the diaper 1 is worn, as in the relaxed state. As used herein, the term "natural state" refers to a state (relaxed state) in which the absorbent article is not stretched without applying an external force to each elastic member arranged in the absorbent article such as the diaper 1. means.

5, both ends 53F, 53F in the longitudinal direction X of the portion of the elastic member 53 for absorber that can be stretched in the longitudinal direction X. 53R exists in the high-rigidity region 51 or outside of the high-rigidity region 51 in the horizontal direction Y, in other words, the projected image of the high-rigidity region 51 in the horizontal direction Y and the vertical direction X in the absorbent elastic member 53 It is characterized in that both ends 53F and 53R of the stretchable portion are overlapped with each other.
The above-mentioned "portion of the elastic member 53 for absorber that can be stretched in the longitudinal direction X" is typically the other part of the elastic member 53 for absorber that is fixed to another member in a state of being stretched in the longitudinal direction X. Both end portions 53F and 53R of the absorbent elastic member 53, which are portions fixed to members, are both end portions in the longitudinal direction X of the fixed portion. The absorbent elastic member 53 may have a non-fixed portion that is not fixed to other members outside of both ends 53F and 53R in the longitudinal direction X. It is not a stretchable part.

When the elastic member 53 for absorber is contractably arranged in the vicinity thereof for the purpose of erecting both sides (extending portion 7E of the second core 7) along the longitudinal direction X of the absorber 5, the elastic member 53 for absorber is contracted. Irregular wrinkles are generated in the absorbent body 5 due to the shrinkage, and there is concern that inconvenience such as deterioration of the appearance of the diaper 1 when worn may occur. In particular, when an absorbent sheet 70 having a relatively thin thickness, flexibility, and low rigidity is introduced as the absorber 5 (second core 7) as in the present embodiment, the shrinkage of the absorber elastic member 53 causes an inconvenience. The occurrence of regular wrinkles tends to be noticeable. However, in the diaper 1, both ends 53F and 53R in the vertical direction X of the portion of the absorbent body elastic member 53 that is stretchable in the vertical direction X have relatively high vertical rigidity in the absorbent body 5 and are difficult to bend in the vertical direction X. By overlapping with the projection image of the rigid region 51 in the lateral direction Y, the influence of contraction of the absorbent body elastic member 53 on the absorbent body 5 is suppressed. Even when the absorbent body 5 is configured to include the sheet 70 (second core 7 ), irregular wrinkles are less likely to occur in the absorbent body 5 . Therefore, the diaper 1 suppresses the inconvenience caused by the introduction of the absorber elastic member 53, and the expected effects of the introduction (improved appearance when worn by standing up both sides of the absorber 5, improved fit) , side leakage prevention, etc.), and it is comfortable to wear and has excellent appearance when worn.

In particular, in the diaper 1 of the present embodiment, not only both ends 53F and 53R in the longitudinal direction X of the portion of the absorbent elastic member 53 that can be stretched in the longitudinal direction X, but also the entirety of the elastic member 53 stretches in the lateral direction Y of the high-rigidity region 51. , the occurrence of irregular wrinkles in the absorber 5 due to contraction of the absorber elastic member 53 can be effectively suppressed. In addition, in the present embodiment, since the absorbent body 5 is configured to include the absorbent sheet 70, the function and effect of standing up both sides of the absorbent body 5 are combined to improve wearing comfort and appearance when worn. even better.

In this embodiment, as shown in FIG. 5, the ventral end 6F and the dorsal end 6R of the auxiliary absorbent layer 60 (first core 6) are aligned with the ventral end 7F of the absorbent sheet 70 (second core 7). The separation distance La in the longitudinal direction X between the ventral end 6F of the auxiliary absorbent layer 60 and the ventral end 7F of the absorbent sheet 70 is the dorsal edge 7R of the auxiliary absorbent layer 60. It is preferable that the side edge 6R and the back edge 7R of the absorbent sheet 70 are shorter than the separation distance Lb in the vertical direction X. The establishment of such a magnitude relationship of "distance La<distance Lb" means that the auxiliary absorbent layer 60 is biased toward the ventral side. In general, the excretory portion-facing portion of the absorbent article that faces the wearer's excretory portion is biased toward the ventral side of the longitudinal center line CLx. Since the laminated structure of the auxiliary absorbent layer 60 and the absorbent sheet 70 is arranged in and around the diaper 1, the liquid absorption performance of the diaper 1 can be further improved. On the other hand, when the diaper 1 is not in use (during market distribution) or when discarded after use, the diaper 1 may be folded in half in the vertical direction X. Since the non-arrangement area is relatively large on the dorsal end 7R side of the second core 7, the diaper 1 can be folded in the non-arrangement area of the auxiliary absorbent layer 60 when the diaper 1 is folded in half. Therefore, compared to the case where the diaper 1 is folded in the area where the laminated structure is arranged, the folding operation can be performed smoothly, and the folds are likely to be neat. Further, by establishing the size relationship, there is also the advantage that the diaper 1 in the folded state has a relatively small thickness and is less bulky.

Assuming that the former < the latter, the ratio of the separation distance La to the separation distance Lb is preferably 0.10 or more, more preferably 0.15 or more, and more preferably 0.45 or less, and more preferably 0.45 or less. is 0.35 or less.
Assuming that the separation distance La is shorter than the separation distance Lb, it is preferably 10 mm or more, more preferably 20 mm or more, and preferably 35 mm or less, more preferably 25 mm or less.
Assuming that the separation distance Lb is longer than the separation distance La, it is preferably 50 mm or more, more preferably 60 mm or more, and preferably 150 mm or less, more preferably 130 mm or less.

In the present embodiment, as described above, as shown in FIG. 5, the auxiliary absorbent layer 60 (the first core 6) is provided in the crotch portion M where the absorbent elastic member 53 is arranged so as to be stretchable in the longitudinal direction X. A part of the absorbent sheet 70 (the extension of the second core 7 ) that has a narrow portion 62 with a relatively short length (width) in the direction Y and extends outward in the lateral direction Y from the narrow portion 62 . Since the projecting portion 7E) is configured to stand up by contraction of the absorbent elastic member 53, the narrow portion 62 does not exist and the laminated structure of the auxiliary absorbent layer 60 and the absorbent sheet 70 stands up. Both sides of the absorbent body 5 can stand upright in the longitudinal direction X, and the effect of such uprightness can be more reliably achieved. In addition, in the present embodiment, the auxiliary absorbent layer 60 has the wide portion 61 with a relatively long length (width) in the horizontal direction Y on the abdomen side of the wearer rather than the narrow portion 62. A wide portion 61 is arranged in the portion facing the excretory portion and its peripheral portion, and the liquid absorption performance of the diaper 1 is ensured.

From the viewpoint of further enhancing the uprightness of both sides of the absorber 5 along the longitudinal direction X (in the present embodiment, the pair of extensions 7E, 7E of the second core 7) due to contraction of the absorber elastic member 53, FIG. , in the auxiliary absorbent layer 60 (first core 6), the length L62 in the longitudinal direction X of the narrow portion 62 is Longer than the length L61 is preferred. Specifically, the length L62 of the narrow portion 62 is preferably 1.5 times or more, more preferably 2.0 times or more, the length L61 of the wide portion 61 . On the other hand, from the viewpoint of ensuring the liquid absorption performance of the diaper 1, the length L62 of the narrow portion 62 is preferably 3.5 times or less, more preferably 3.0 times the length L61 of the wide portion 61. It is below.

In the diaper 1 in the unfolded and maximum stretched state as shown in FIG. 2, as shown in FIG. , more preferably 80% or more, is preferably present in the narrow portion 62 of the auxiliary absorbent layer 60 (first core 6) or outside the narrow portion 62 in the lateral direction Y. In other words, the length in the vertical direction X of the overlapped portion between the projected image of the narrow width portion 62 in the horizontal direction Y and the portion of the elastic member for absorber 53 that can be expanded and contracted in the vertical direction X is the length of the elastic member for absorber. It is preferably 60% or more of the total length L53 in the longitudinal direction X of the portion 53 that can be stretched in the longitudinal direction X. As a result, the erectability of both sides of the absorber 5 along the longitudinal direction X (in this embodiment, the pair of extensions 7E, 7E of the second core 7) due to contraction of the absorber elastic member 53 can be further improved. . The total length L53 is typically the length in the vertical direction X of the fixing portion of the absorbent body elastic member 53 to another member in the diaper 1 in the unfolded and maximally stretched state.

In addition, when the portion of the elastic member for absorber 53 that can be stretched in the vertical direction X exists in the wide portion 61 or outside the wide portion 61 in the horizontal direction Y, in other words, the portion of the wide portion 61 in the horizontal direction Y When the projected image and the part of the elastic member for absorber 53 that can be stretched in the vertical direction X overlap, the projected image of the narrow width portion 62 in the horizontal direction Y and the elastic member for absorber 53 that can be stretched in the vertical direction X Both sides of the absorber 5 along the longitudinal direction X (the pair of extensions 7E, 7E of the second core 7) are difficult to stand up compared to the case where the two portions overlap each other. In addition, the portion where the wide portion 61 is arranged (the portion that is biased toward the ventral side of the vertical center line CLx of the diaper 1) is the portion facing the excretion portion where body fluids of the wearer of the diaper 1 are concentratedly excreted. Therefore, it is preferable that the length (width) of the auxiliary absorbent layer 60 in the lateral direction Y is as long as possible at this portion. From this point of view, the length in the vertical direction X of the overlapping portion between the projected image of the wide width portion 61 in the horizontal direction Y and the portion of the elastic member for absorber 53 that is stretchable in the vertical direction X is 15% or less of the total length L53 in the longitudinal direction X of the portion of the member 53 that can be stretched in the longitudinal direction X is preferable, and the length of the overlapping portion in the longitudinal direction X may be zero.

Referring to FIG. 5, the ratio between the width W61 of the constant width portion 61A and the width W62 of the narrow portion 62 in the wide portion 61 of the auxiliary absorbent layer 60 (first core 6) is based on the assumption that width W61>width W62. , width W61/width W62 is preferably 1.2 or more, more preferably 1.5 or more, and preferably 2.5 or less, more preferably 2.0 or less.
The ratio between the width W61 of the constant width portion 61A (that is, the maximum width of the auxiliary absorbent layer 60) and the maximum length (width) of the absorbent sheet 70 (second core 7) in the lateral direction Y is the former/latter is preferably 0.8 or more and preferably 1.0 or less.
The ratio between the width W62 of the narrow portion 62 (that is, the minimum width of the auxiliary absorbent layer 60) and the maximum length (width) of the absorbent sheet 70 (second core 7) in the lateral direction Y is the former/latter is preferably 0.5 or more and preferably 0.7 or less.

In this embodiment, as shown in FIGS. 2 to 5, the auxiliary absorbent layer 60 (first core 6) has recesses 63 having openings on at least one of the skin-facing surface and the non-skin-facing surface. As a result, the erectability of both sides of the absorber 5 along the longitudinal direction X (in this embodiment, the pair of extensions 7E, 7E of the second core 7) due to contraction of the absorber elastic member 53 can be further improved. .

In the diaper 1 in the unfolded and maximum stretched state, preferably 50% or more, more preferably 75% or more of the total length of the concave portion 63 in the longitudinal direction X exists in the narrow portion 62 of the auxiliary absorbent layer 60 (first core 6). preferably. In other words, the length in the vertical direction X of the overlapped portion of the projected image of the narrow portion 62 in the horizontal direction Y and the recess 63 is preferably 50% or more of the total length in the vertical direction X of the recess 63 . As a result, the erectability of both sides of the absorber 5 along the longitudinal direction X (in this embodiment, the pair of extensions 7E, 7E of the second core 7) due to contraction of the absorber elastic member 53 can be further improved. .

In the present embodiment, the concave portions 63 have a rectangular shape elongated in the vertical direction X in plan view as shown in FIG. The pair of recessed portions 63, 63 are respectively arranged at least in the crotch portion M, and further extend to portions near the crotch portion M of the ventral portion F and the back portion R, respectively. Further, in the illustrated embodiment, the concave portion 63 is a through hole penetrating the first core 6 in the thickness direction, as shown in FIG. have. Since the concave portion 63 is not formed in the second core 7 (absorbent sheet 70), the absorber 5 (laminated structure of the first core 6 and the second core 7) corresponds to the concave portion 63 on the skin facing surface. A groove-shaped concave portion extending in the vertical direction X and having a bottom portion is formed at the position corresponding to the vertical direction.

From the viewpoint of ensuring the above-described effects of the recess 63, it is preferable to set the dimensions of the recess 63 as follows. From the same point of view, it is preferable that the recess 63 is formed in the crotch portion M as in the present embodiment.
The length (width) of the recess 63 in the lateral direction Y is preferably 5 mm or more, more preferably 10 mm or more, and preferably 25 mm or less, more preferably 15 mm or less.
The length of the concave portion 63 in the longitudinal direction X is preferably 30% or more, more preferably 40% or more, and preferably 70% or less, more preferably 60% of the total length of the first core 6 in the longitudinal direction X. % or less.

In the manufacturing process of the first core 6, the concave portion 63 is formed by not depositing the forming material (water absorbing material) of the first core 6 on the formation planned portion of the concave portion 63, or by reducing the deposition amount of the forming material on the formation planned portion. It can be formed by using a smaller amount than the part. As another method for forming the recesses 63, there is a method of manufacturing a precursor of the first core 6 in which the deposition amount of the forming material is uniform, and applying compression processing such as embossing to the portions of the precursor where the recesses 63 are to be formed. mentioned. The recessed portion 63 formed by such pressing has a higher density and higher rigidity than the peripheral portion of the recessed portion 63 in the first core 6 .

FIG. 6 shows another embodiment of the absorbent body according to the invention. As for other embodiments to be described later, configurations different from those of the above embodiments will be described, and configurations similar to those of the above embodiments will be assigned the same reference numerals, and description thereof will be omitted. The description of the above embodiment is appropriately applied to configurations that are not particularly described in other embodiments described later.

The absorber 5A shown in FIG. 6 has a rectangular plan view shape of the auxiliary absorbent layer 60A forming the first core 6, and the auxiliary absorbent layer 60A does not have the concave portion 63. Different from body 5. The absorbent article provided with the auxiliary absorbent layer 60A also has basically the same effect as the diaper 1, but the elastic member 53 for the absorbent body shrinks at the crotch portion M, causing the absorbent body 5A to stretch along the longitudinal direction X. The side portions (the pair of extension portions 7E, 7E of the second core 7) are enhanced in uprightness, and the liquid absorption performance of the portion facing the excretory portion is enhanced, so that the predetermined effects of the present invention can be achieved more reliably. From the viewpoint of making it easier to wear, it is preferable that the auxiliary absorbent layer 60 has a narrow portion 62 in the crotch portion M and a wide portion 61 on the abdomen side of the wearer (the portion facing the excretory portion) rather than the narrow portion 62. .

The absorbent article of the present invention is not limited to a pants-type disposable diaper as in the above embodiment, but broadly includes articles used for absorbing bodily fluids (urine, menstrual blood, loose stools, sweat, etc.) excreted from the human body, Also included are unfoldable disposable diapers, sanitary napkins, sanitary shorts and the like having so-called fastening tapes.

Although the present invention has been described based on the embodiments, the present invention is not limited to the above embodiments and can be modified as appropriate.
For example, in the above-described embodiment, the absorbent sheet 70 (second core 7) was arranged on the skin facing side of the auxiliary absorbent layers 60, 60A (first core 6). You may distribute|arrange to the opposing surface side. That is, the first core 6 may be composed of the absorbent sheet 70, and the second core 7 may be composed of the auxiliary absorbent layers 60, 60A.
In the above-described embodiment, in the diaper 1 in the unfolded and maximally stretched state, the entire absorbent elastic member 53 exists in the high-rigidity region 51 or outside the high-rigidity region 51 in the lateral direction Y, that is, the high-rigidity region 51 However, in the present invention, at least both ends 53F and 53R in the longitudinal direction X of the stretchable portion in the longitudinal direction X of the absorbent elastic member 53 overlap the projected image. For example, the central portion in the longitudinal direction X of the portion of the elastic member for absorber 53 that can be stretched in the longitudinal direction X does not have to overlap with the projected image. This can occur, for example, when a plurality of high-rigidity regions 51 are arranged discontinuously in the longitudinal direction X. It is preferable that the number of portions of the diaper 1 in the stretched state that do not overlap with the projected image of the high-rigidity region 51 in the lateral direction Y is as small as possible, and it is preferable that such portions do not exist as in the above-described embodiment.
In addition, in the above-described embodiment, the exterior body 10 is formed separately into a ventral exterior body and a dorsal exterior body. It may be in the form of continuously extending across the side R.
All the parts that only one embodiment has as described above can be used interchangeably as appropriate.

The following notes are further disclosed with respect to the above-described embodiments of the present invention.
<1>
It has an abdominal portion arranged on the abdomen side of the wearer when worn, a dorsal portion arranged on the back side of the wearer, and a crotch portion located therebetween, and from the abdominal portion via the crotch portion An absorbent article having a longitudinal direction extending to the dorsal portion and a lateral direction orthogonal to the longitudinal direction, and comprising an absorbent body that absorbs and retains body fluid,
The absorbent body is divided in the longitudinal direction into a high-rigidity region and a low-rigidity region having different stiffnesses in the longitudinal direction, and the high-rigidity region has higher stiffness in the longitudinal direction than the low-rigidity region. containing the area,
An elastic member extending in the longitudinal direction is arranged so as to be stretchable in the longitudinal direction on each of both side portions of the absorber along the longitudinal direction at least in the crotch portion,
In the absorbent article in the unfolded and maximally stretched state, both longitudinal ends of the longitudinally stretchable portion of the elastic member extend outward from the high-rigidity region or in the lateral direction of the high-rigidity region. An absorbent article that exists.
<2>
The absorbent according to <1>, wherein the absorbent body includes an absorbent sheet, and the absorbent sheet includes a base sheet and a water-absorbent polymer disposed on the surface of the base sheet. sexual goods.
<3>
The absorbent article according to <2> above, wherein the absorbent sheet has a configuration in which the particulate water-absorbing polymer is interposed between two base sheets arranged opposite to each other in the thickness direction. .

<4>
The absorbent body includes the absorbent sheet and an auxiliary absorbent layer arranged so as to overlap with a part of the absorbent sheet in the thickness direction,
The high-rigidity region is a region that overlaps with the auxiliary absorbent layer in a plan view and a region of the absorbent body located outside the auxiliary absorbent layer in the lateral direction,
The absorbent article according to <2> or <3>, wherein the low-rigidity region is a region that does not overlap the auxiliary absorbent layer in the longitudinal direction of the absorbent body.
<5>
The absorbent sheet has a rectangular shape in plan view, and the lateral length of the absorbent sheet is the maximum lateral length of the auxiliary absorbent layer (the lateral length of the wide portion). The absorbent article according to <4>, which is longer than the above.
<6>
In <4> or <5>, wherein the absorbent sheet has a pair of extending portions extending outward in the lateral direction from side edges along the longitudinal direction of the auxiliary absorbent layer in the crotch portion. The absorbent article described.
<7>
The auxiliary absorbent layer according to any one of <4> to <6>, wherein the auxiliary absorbent layer is mainly composed of a fiber aggregate and contains two or more selected from synthetic fibers, water-absorbent natural fibers and water-absorbent polymers. absorbent article.
<8>
The basis weight of the auxiliary absorbent layer is preferably 200 g/m ² or more, more preferably 250 g/m ² or more, and preferably 450 g/m ² or less, more preferably 400 g/m ² or less, said <4 > The absorbent article according to any one of <7>.
<9>
The absorbent sheet and the auxiliary absorbent layer according to any one of <4> to <8>, wherein at least one of the skin-facing surface and the non-skin-facing surface is covered with a core wrap sheet. absorbent article.

<10>
The longitudinal ventral and dorsal edges of the auxiliary absorbent layer are positioned between the longitudinal ventral and dorsal edges of the absorbent sheet and and the ventral end of the absorbent sheet (La) is the longitudinal distance (Lb) between the dorsal end of the auxiliary absorbent layer and the dorsal end of the absorbent sheet The absorbent article according to any one of <4> to <9>, which is shorter than the .
<11>
The ratio of the separation distance La and the separation distance Lb is preferably 0.10 or more, more preferably 0.15 or more, and preferably 0.45 or less, more preferably 0.35 or less, as the former/latter. The absorbent article according to <10> above.
<12>
The separation distance La is preferably 10 mm or more, more preferably 20 mm or more, and preferably 35 mm or less, more preferably 25 mm or less,
The absorbent article according to <10> or <11> above, wherein the separation distance Lb is preferably 50 mm or more, more preferably 60 mm or more, and preferably 150 mm or less, more preferably 130 mm or less.
<13>
The absorbent article according to any one of <4> to <12>, wherein the auxiliary absorbent layer has recesses having openings on at least one of the skin-facing surface and the non-skin-facing surface.

<14>
The auxiliary absorbent layer has a narrow portion having a relatively short width in the lateral direction at the crotch portion, and has a relatively short width in the lateral direction on the abdomen side of the wearer from the narrow portion. has a relatively long wide part,
Any one of <4> to <12> above, wherein the portion of the wide portion closer to the narrow portion has a length in the lateral direction that gradually increases from the dorsal side to the ventral side of the wearer. absorbent article.
<15>
The auxiliary absorbent layer has recesses having openings on at least one of the skin-facing surface and the non-skin-facing surface, and in the absorbent article in the unfolded and maximally stretched state, the total length of the recesses in the vertical direction is preferably 50%. % or more, more preferably 75% or more of the absorbent article is present in the narrow portion, the absorbent article according to <14>.
<16>
The recess is formed in the crotch portion,
The lateral length (width) of the recess is preferably 5 mm or more, more preferably 10 mm or more, and preferably 25 mm or less, more preferably 15 mm or less,
The length of the recess in the vertical direction is preferably 30% or more, more preferably 40% or more, and preferably 70% or less, more preferably 60%, of the total length of the auxiliary absorbent layer in the vertical direction. % or less, the absorbent article according to <15>.
<17>
The vertical length (L62) of the narrow portion is preferably 1.5 times or more, more preferably 2.0 times or more, the vertical length (L61) of the wide portion, The absorbent article according to any one of <14> to <16> above, which is preferably 3.5 times or less, more preferably 3.0 times or less.
<18>
Preferably 60% or more, more preferably 80% or more of the total longitudinal length (L53) of the longitudinally stretchable portion of the elastic member in the absorbent article in the unfolded and maximally stretched state is the width. The absorbent article according to any one of <14> to <17>, wherein the narrow portion or the outer side of the narrow portion in the lateral direction is present.
<19>
The length in the vertical direction of the overlapping portion between the projected image of the wide portion in the horizontal direction and the portion of the elastic member that can be stretched in the vertical direction is the length of the portion of the elastic member that is stretchable in the vertical direction. The absorbent article according to any one of <14> to <18>, which is 15% or less of the total length (L53) in the longitudinal direction.
<20>
The wide portion is a constant width portion in which the length (W61) in the horizontal direction is constant over the entire longitudinal length of the auxiliary absorbent layer on the ventral side in the longitudinal direction. the narrow width portion side is a width changing portion in which the length (W62) in the horizontal direction is not constant;
The ratio of the lateral length (W61) of the constant width portion to the lateral length (W62) of the narrow width portion is preferably 1.2 or more, more preferably 1. The absorbent article according to any one of <14> to <19> above, which is 0.5 or more, preferably 2.5 or less, and more preferably 2.0 or less.
<21>
The ratio of the lateral length (W61) of the constant width portion to the maximum value of the lateral length of the absorbent sheet is preferably 0.8 or more, and preferably is 1.0 or less, the absorbent article according to <20>.
<22>
The ratio of the lateral length (W62) of the narrow portion to the maximum value of the lateral length of the absorbent sheet is preferably 0.5 or more, and preferably is 0.7 or less, the absorbent article according to <20> or <21>.
<23>
The absorbent article according to any one of <1> to <22>, wherein the absorbent article is a disposable diaper, a sanitary napkin, or sanitary shorts.

1 Pants-type disposable diaper (absorbent article)
2 Absorbent main body 3 Top sheet 4 Back sheet 5, 5A Absorber 51 High rigidity region 52 Low rigidity region 53 Absorber elastic member 6 First core 60, 60A Auxiliary absorbent layer 61 Wide width portion 61A Constant width portion 61B Width change portion 62 Narrow portion 63 Recess 7 Second core 70 Absorbent sheet 71 Base sheet 72 Water-absorbent polymer 8 Leak-proof cuff 10 Exterior body X Vertical direction Y Lateral direction F Abdominal part M Crotch part R Back part

Claims (10)

It has an abdominal portion arranged on the abdomen side of the wearer when worn, a dorsal portion arranged on the back side of the wearer, and a crotch portion located therebetween, and from the abdominal portion via the crotch portion An absorbent article having a longitudinal direction extending to the dorsal portion and a lateral direction orthogonal to the longitudinal direction, and comprising an absorbent body that absorbs and retains body fluid,
The absorbent body is divided in the longitudinal direction into a high-rigidity region and a low-rigidity region having different stiffnesses in the longitudinal direction, and the high-rigidity region has higher stiffness in the longitudinal direction than the low-rigidity region. containing the area,
An elastic member extending in the longitudinal direction is arranged so as to be stretchable in the longitudinal direction on each of both side portions of the absorber along the longitudinal direction at least in the crotch portion,
In the absorbent article in the unfolded and maximally stretched state, both longitudinal ends of the longitudinally stretchable portion of the elastic member extend outward from the high-rigidity region or in the lateral direction of the high-rigidity region. An absorbent article that exists. 2. The absorbent according to claim 1, wherein the absorbent body includes an absorbent sheet, and the absorbent sheet includes a base sheet and a water-absorbent polymer disposed on the surface of the base sheet. Goods. The absorbent body includes the absorbent sheet and an auxiliary absorbent layer arranged so as to overlap with a part of the absorbent sheet in the thickness direction,
The high-rigidity region is a region that overlaps with the auxiliary absorbent layer in a plan view and a region of the absorbent body located outside the auxiliary absorbent layer in the lateral direction,
3. The absorbent article according to claim 2, wherein the low-rigidity region is a region of the absorbent body that does not overlap with the auxiliary absorbent layer in the longitudinal direction. The longitudinal ventral and dorsal edges of the auxiliary absorbent layer are positioned between the longitudinal ventral and dorsal edges of the absorbent sheet and and the ventral edge of the absorbent sheet is shorter than the longitudinal distance between the dorsal edge of the auxiliary absorbent layer and the dorsal edge of the absorbent sheet. Item 4. The absorbent article according to item 3. 5. The absorbent article according to claim 3, wherein the auxiliary absorbent layer has recesses having openings on at least one of the skin-facing surface and the non-skin-facing surface. The auxiliary absorbent layer has a narrow portion having a relatively short width in the lateral direction at the crotch portion, and has a relatively short width in the lateral direction on the abdomen side of the wearer from the narrow portion. has a relatively long wide part,
5. The absorbent article according to claim 3, wherein the portion of the wide portion closer to the narrow portion has a length in the horizontal direction that gradually increases from the dorsal side to the ventral side of the wearer. The auxiliary absorbent layer has recesses having openings on at least one of the skin-facing surface and the non-skin-facing surface, and in the absorbent article in the unfolded and maximally stretched state, 50% or more of the total length of the recesses in the vertical direction. is present in said narrow portion. 8. The absorbent article according to claim 6, wherein the longitudinal length of the narrow portion is at least 1.5 times the longitudinal length of the wide portion. In the absorbent article in the unfolded and maximum stretched state, 60% or more of the total length in the longitudinal direction of the longitudinally stretchable portion of the elastic member is the narrow portion or the width of the narrow portion in the lateral direction. Absorbent article according to any one of claims 6 to 8, present on the outside. The absorbent according to any one of claims 3 to 9, wherein the auxiliary absorbent layer is mainly composed of a fiber assembly and contains two or more types selected from synthetic fibers, water-absorbing natural fibers and water-absorbing polymers. Goods.

Images