WO2020137426A1

WO2020137426A1 - Tape-type diaper

Info

Publication number: WO2020137426A1
Application number: PCT/JP2019/047693
Authority: WO
Inventors: 祐介川上; ジュイーガオ; リャンリャンシェン
Original assignee: ユニ・チャーム株式会社
Priority date: 2018-12-29
Filing date: 2019-12-05
Publication date: 2020-07-02
Also published as: JP2020108751A; CN212214032U; CN111374830A

Abstract

Provided is a tape-type diaper with which it is possible to minimize leakage of liquid while minimizing deterioration in the fit thereof. This tape-type diaper (1) is provided with: an absorbent body (10) which comprises an absorber (14) and which has a ventral section (2), a dorsal section (3), and a crotch section (4); and a pair of locking members (7, 7) that are disposed on both width-direction outer sides of the dorsal-side section. The absorber comprises a superabsorbent polymer and is provided with a dorsal-side area (BA), a crotch area (MA), and a ventral-side area (FA). The dorsal-side area includes a low-basis-weight area (BAb) in which the basis weight of the superabsorbent polymer is lower than that in the crotch area. The pair of locking members overlap the low-basis-weight area in the width direction.

Description

Tape diaper

The present invention relates to a tape type diaper.

Absorbent articles using an absorbent containing a relatively large amount of super absorbent polymer (Super Absorber Polymer; SAP) are known as absorbent materials. Since the absorber (so-called SAP sheet) containing a relatively large amount of the superabsorbent polymer has a small thickness, it is possible to improve the wearability and fit, and can be said to be a preferable absorber. As such an absorbent body, for example, Patent Document 1 discloses an absorbent core containing an absorbent material. The absorbent core is used in absorbent articles such that the absorbent material is substantially free of cellulosic fibers and forms a pattern of discrete areas of absorbent material. The pattern includes a dot formation region and at least one of a region extending in the width direction and a region extending in the longitudinal direction.

Japanese Patent Publication No. 2017-516542

When applying an absorber containing a relatively large amount of superabsorbent polymer to a tape-type diaper, it is possible to use an absorber in which the superabsorbent polymer is arranged approximately uniformly in a plane. In such a tape-type diaper, when the superabsorbent polymer absorbs a liquid (eg, urine) and swells after being attached, the rigidity of the absorbent body is increased and the absorbent body becomes a shape which is relatively straight in the longitudinal direction. As a result, for example, the back-side end of the absorbent body in the longitudinal direction may deform the tape-type diaper into a shape in which the back-side portion of the tape-type diaper is projected outward. In that case, the flatness of the back side part is impaired, the fit property of the tape type diaper may be impaired, and liquid may leak from the gap formed between the back side part and the skin surface.

Here, the absorber (absorbent core) of Patent Document 1 is divided into a plurality of regions in a plan view in order to improve wearing comfort. However, it is not taken into consideration that the absorbent body may have a shape that absorbs liquid and pops out after the tape-type diaper is mounted.

An object of the present invention is to provide a tape-type diaper containing a superabsorbent polymer, which can suppress deterioration of fit and suppress leakage of liquid.

The tape type diaper of the present invention is as follows. (1) A ventral side portion that has a longitudinal direction, a width direction, and a thickness direction that are orthogonal to each other, includes an absorber, and that is located on the front side in the longitudinal direction, the back side portion that is located on the rear side, and the ventral side portion. A tape-type diaper, comprising: an absorptive main body having a crotch portion located between the back side portion and the back side portion; and a pair of locking members positioned on both outer sides in the width direction of the back side portion. The absorbent body contains a super absorbent polymer, a crotch region, a back side region adjacent to the longitudinal direction rear side of the crotch region, and a ventral side region adjacent to the longitudinal front side of the crotch region. And the back side region includes a low basis weight region in which the basis weight of the superabsorbent polymer is lower than the crotch region, and in the width direction, the pair of locking members includes the low basis weight. A tape-type diaper that overlaps the area.

The tape-type diaper has the above-mentioned configuration, and the low basis weight region in which the basis weight of the superabsorbent polymer is lower than the crotch region overlaps the pair of locking members in the width direction. When such a tape-type diaper is attached to an infant, the pair of locking members are pulled while the pair of locking members at both ends of the back side are pulled outward in the width direction to press the back side against the back of the baby. To the ventral side. Therefore, by pressing the back side part against the back of the baby, it is possible to press the thin and low-rigidity low basis weight region against the back of the baby. As a result, even if the super absorbent polymer swells after mounting, the thickness before swelling in the low basis weight region is thin, and since the super absorbent polymer in the low basis weight region is small, it does not easily become thick even when swollen, The low basis weight region is pressed against the skin surface by the pair of locking members, so that the back side portion can be suppressed from being deformed into a shape protruding outward. That is, it is possible to prevent the back side portion from having a convex shape. Thereby, it is possible to prevent the fitting property from being impaired and prevent the liquid from leaking through the gap formed between the back side portion and the skin surface.

(2) The tape-type diaper of the present invention further comprises (2) an elastic member capable of expanding and contracting in the width direction between the pair of locking members on the back side portion, and the elastic member has the low width in plan view. The tape-type diaper according to (1) above, which overlaps with the basis weight region, may be used.
In the present tape type diaper, the elastic member overlaps the low basis weight region of the back side region of the absorbent body. Therefore, even if the super absorbent polymer swells after mounting and the low basis weight region swells, the low basis weight region is also pressed against the skin surface as the elastic member moves toward the skin side due to the contracting force in the width direction. As a result, it is possible to further prevent the back side portion from being deformed into a shape protruding outward. As a result, it is possible to further prevent the fit property from being impaired, and it is possible to further prevent the liquid from leaking from the gap formed between the back side portion and the skin surface.

The tape type diaper of the present invention has (3) a longitudinal direction, a width direction and a thickness direction orthogonal to each other, including an absorber, and a ventral side portion located on the front side in the longitudinal direction and a spine located on the rear side. An absorptive main body having a side portion and a crotch portion located between the abdominal side portion and the back side portion, and a pair of locking members positioned on both outer sides in the width direction of the back side portion, A tape-type diaper, further comprising: an elastic member capable of expanding and contracting in the width direction between the pair of locking members on the back side, wherein the absorbent body contains a super absorbent polymer, A region, a back side region adjacent to the longitudinal direction rear side of the crotch region, and a ventral side region adjacent to the longitudinal direction front side of the crotch region, wherein the back side region is the crotch region. A tape-type diaper including a low basis weight region in which the basis weight of the superabsorbent polymer is lower than that of the superabsorbent polymer, and the elastic member overlaps the low basis weight region in a plan view.

The tape-type diaper has the above-mentioned configuration, and the back side region includes the low basis weight region, and the low basis weight region overlaps the elastic member in the thickness direction. In this tape type diaper, even if the super absorbent polymer swells after wearing, the thickness before swelling in the low basis weight region is thin, and since the super absorbent polymer in the low basis weight region is small, it becomes thick even if it swells. Difficulty, as the elastic member moves toward the skin side due to the contracting force in the width direction, the low basis weight area is also pressed against the skin surface, etc., so that the back side part deforms to a shape protruding to the outside. Can be suppressed. That is, it is possible to prevent the back side portion from having a convex shape. Thereby, it is possible to prevent the fitting property from being impaired and prevent the liquid from leaking through the gap formed between the back side portion and the skin surface.

(4) The tape-type diaper of the present invention may be the tape-type diaper according to (2) or (3) above, wherein the elastic member is located on the non-skin side of the absorber.
In this tape type diaper, the elastic member is located on the non-skin side of the absorber. Therefore, even if the super absorbent polymer swells after mounting and the low basis weight area swells, the elastic member moves toward the skin side due to the contracting force in the width direction, and the low basis weight area also expands to the non-skin side due to the elastic member. When the back side portion is pushed to the skin side and pressed against the skin surface, it is possible to further suppress the back side portion from being deformed into a shape protruding outward. As a result, it is possible to further prevent the fit property from being impaired, and it is possible to further prevent the liquid from leaking from the gap formed between the back side portion and the skin surface.

The tape-type diaper of the present invention may be (5) the tape-type diaper according to the above (4), in which the elastic member is directly joined to the surface of the absorber on the non-skin side.
In the present tape-type diaper, since the elastic member is directly joined to the surface of the absorbent body on the non-skin side, the elastic force of the elastic member can be directly transmitted to the absorbent body. Therefore, the superabsorbent polymer swells after mounting, even if the low basis weight region swells, the low basis weight region is pressed from the non-skin side to the skin side by the elastic member and is reliably pressed against the skin surface. It is possible to more reliably suppress the deformation of the back side portion into a shape protruding outward. As a result, it is possible to further prevent the fit property from being impaired, and it is possible to further prevent the liquid from leaking through the gap formed between the back side portion and the skin surface.

In the tape type diaper of the present invention, (6) the elastic member is located at the center portion in the width direction, extends from the front edge in the longitudinal direction to the rear side, and has low elasticity in the elastic property in the width direction. And a pair of high-stretch regions that are adjacent to both sides of the low-stretch region in the width direction and have high stretchability in the width direction, and the low-stretch region has a low basis weight in plan view. The tape-type diaper according to the above (4) or (5), which overlaps with the region, may be used.
In this tape-type diaper, the low elastic region of the elastic member overlaps the low basis weight region. Therefore, even if the entire elastic member contracts, it is possible to make it difficult for the low basis weight region (absorbent body) to contract, and the low basis weight region (absorbent body) easily contracts, causing wrinkles before mounting. Thus, it is possible to prevent the generated wrinkles from partially concentrating the absorption of the liquid and deforming the back side portion 3 into a shape that pops out to the outside. That is, even if the super absorbent polymer swells after mounting and the low basis weight region swells, it is possible to further prevent the back side portion from being deformed into a shape protruding to the outside. As a result, it is possible to further prevent the fit property from being impaired, and it is possible to further prevent the liquid from leaking from the gap formed between the back side portion and the skin surface.

(7) In the tape type diaper of the present invention, in the longitudinal direction, a length of a portion of the elastic member that overlaps with the absorber is shorter than a length of a portion that does not overlap with the absorber, (4) to (4) above. The tape type diaper according to any one of 6) may be used.
In the tape-type diaper, the length of the portion of the elastic member that overlaps the absorber is shorter than the length of the portion that does not overlap the absorber. Therefore, even if the elastic member shrinks as a whole, it is possible to make it difficult for the low basis weight region (absorbent body) to shrink. As a result, the low grammage region easily contracts and wrinkles are formed before mounting, or the wrinkles are partially concentrated to absorb the liquid, and the back side part 3 is deformed into a shape protruding outward. Can be suppressed. That is, even if the superabsorbent polymer swells after mounting and the low basis weight region swells, the elastic member can further suppress the deformation of the back side portion into a shape protruding outward. As a result, it is possible to further prevent the fit property from being impaired, and it is possible to further prevent the liquid from leaking from the gap formed between the back side portion and the skin surface.

(8) The elastic member is located closer to the skin than the absorbent body,
The low basis weight region may be the tape-type diaper according to (2) or (3) above, which is not joined to the elastic member.
In the present tape type diaper, the elastic member is located on the skin side of the absorber. Therefore, even if the super absorbent polymer swells after mounting and the low basis weight area swells, the low basis weight area is also pulled to the skin surface as the elastic member moves toward the skin side due to the contracting force in the width direction. Thus, it is possible to prevent the back side portion from being deformed into a shape protruding outward. In addition, in the tape-type diaper, the low basis weight region of the absorber is not joined to the elastic member. Therefore, a pocket-shaped portion can be formed between the low basis weight region and the elastic member. Thus, the elastic force of the elastic member allows the pocket-shaped portion to receive the liquid reaching the back side while keeping the back side in close contact with the wearer's skin. Therefore, it is possible to further prevent the fit property from being impaired, and it is possible to further prevent the liquid from leaking from the gap formed between the back side portion and the skin surface.

The tape type diaper of this invention is (9) The said absorber is located in the non-skin side of the 1st absorption layer containing the said superabsorbent polymer, and the said 1st absorption layer, and contains the said superabsorbent polymer. And a second absorbing layer, wherein the second absorbing layer includes a protruding portion protruding outward from an end edge of the first absorbing layer at a rear end portion in the longitudinal direction in a plan view, The said protrusion may be the tape type diaper as described in any one of said (1) thru|or (8) containing the said low basic weight area|region.
In the present tape-type diaper, the absorber has a two-layer structure in which the first absorbent layer and the second absorbent layer are laminated, and the low basis weight region is one of the end portions of the second absorbent layer in plan view. It is included in a protrusion that protrudes outward from the edge of the first absorption layer. Therefore, the thickness of the low basis weight region can be surely reduced. As a result, it is possible to prevent the back side portion from being deformed into a shape protruding outward. Therefore, it is possible to prevent the fitting property from being impaired and prevent the liquid from leaking from the gap formed between the back side portion and the skin surface.

The tape type diaper of this invention is (10) The said absorber is located between the said 1st absorptive layer and the said 2nd absorptive layer, and is further equipped with the intermediate|middle layer formed of the non-woven fabric, The said low grammage area|region The skin-side surface of the tape-type diaper according to (9) above may be covered with the intermediate layer.
In the present tape type diaper, the second absorbent layer is provided with a non-woven fabric intermediate layer on the skin side, and the skin side surface in the low basis weight region is covered with the non-woven fabric (intermediate layer). Therefore, the super absorbent polymer in the low grammage region can be made harder to move, whereby the thickness in the low grammage region can be more reliably kept thin. Further, when the back side is in close contact with the skin surface, even if the low basis weight area of the absorbent body is pressed against the skin surface, the skin side surface of the low basis weight area is covered with the non-woven fabric, so that it has high water absorbency. Without feeling the irregularities due to the polymer, it is possible to make it difficult to feel discomfort when wearing. Thereby, it is possible to prevent the fitting property from being impaired and prevent the liquid from leaking through the gap formed between the back side portion and the skin surface.

According to the present invention, it is possible to provide a tape-type diaper containing a superabsorbent polymer that can suppress liquid leakage while suppressing deterioration of fit.

It is a top view showing the example of composition of the tape type diaper concerning an embodiment. FIG. 2 is a sectional view taken along line II-II in FIG. 1. It is a top view and a sectional view showing an example of composition of an absorber concerning an embodiment. It is the top view which expanded a part of back side part of the tape type diaper which concerns on embodiment. It is a schematic diagram explaining the effect of the tape type diaper which concerns on embodiment. It is sectional drawing which expanded a part of back side part of the tape type diaper which concerns on embodiment. It is sectional drawing which expanded a part of back side part of the tape type diaper which concerns on another embodiment.

Hereinafter, a tape-type disposable diaper according to the embodiment (hereinafter, also simply referred to as “tape-type diaper”) will be described. However, the type of tape-type diaper is not limited to this example, and other types of tape-type diaper may be used without departing from the scope of the present invention.

1 and 2 are diagrams showing a configuration example of a tape-type diaper 1 according to an embodiment. FIG. 1 is a plan view showing a developed state of the tape type diaper 1, and FIG. 2 is a sectional view taken along line II-II of FIG. In the state shown in FIG. 1, the tape-type diaper 1 has a longitudinal direction L, a width direction W, and a thickness direction T that are orthogonal to each other, and a longitudinal center line CL that passes through the center of the width direction W and extends in the longitudinal direction L. , A width direction center line CW extending in the width direction W through the center of the longitudinal direction L. The direction and the side approaching the longitudinal centerline CL are respectively inward and inward in the width direction W, and the direction and the side away are respectively outward and outward in the width direction W. The direction and the side approaching the width direction center line CW are defined as the inner direction and the inner side in the longitudinal direction L, and the direction and the side facing away are the outer direction and the outer side in the longitudinal direction L, respectively. The side of the tape-type diaper 1 corresponding to the wearer's abdomen in the longitudinal direction L is referred to as the front side in the longitudinal direction L, which is the front side in the longitudinal direction L, and corresponds to the wearer's back. The side toward the edge 1 (the edge on the back side) is also referred to as the rear side of the longitudinal direction L. The “plan view” means that the tape type diaper 1 in a state of being developed on a plane including the longitudinal direction L and the width direction W is viewed from above in the thickness direction T, and the “planar shape” is grasped in the plan view. Shape. The “planar direction” is an arbitrary direction parallel to the plane including the width direction W and the longitudinal direction L. "Skin side" and "non-skin side" respectively mean the side closer to the wearer's skin surface and the side farther away in the thickness direction T when the tape-type diaper 1 is worn by the wearer. To do. These definitions are commonly used not only for the tape-type diaper 1 but also for the absorber of the tape-type diaper 1 and each material arranged on them.

It is to be noted that not only a member or the like being parallel to the longitudinal direction L means that a member, a structure, a shape or the like is along the longitudinal direction L, but a component Dx of the member or the like in the longitudinal direction L is a component of the member or the like in the width direction W. The case where it is larger than Dy (Dx>Dy) is also included. Similarly, the member and the like extending in the width direction W are not limited to the case where the member and the like are parallel to the width direction W, and the component Dy of the member and the like in the width direction W is greater than the component Dx of the member and the like in the longitudinal direction L. It also includes a large value (Dy>Dx). Regarding a curved or curved member, etc., the member or the like is evaluated as described above with respect to the tangent line of each point on the curve or the like.

As shown in FIG. 1, the tape-type diaper 1 includes an absorbent main body 10 and a pair of locking

members

7, 7. The absorptive main body 10 includes an absorber 14, and is located between the ventral side part 2 located on the front side in the longitudinal direction L, the back side part 3 located on the back side, and between the ventral side part 2 and the back side part 3. It has a crotch portion 4 that does. The abdominal part 2 is a part that comes into contact with the abdomen of the wearer. The back side portion 3 is a portion that contacts the wearer's hip or back. The crotch portion 4 is a portion that comes into contact with the crotch of the wearer, and is constricted inside the width direction W. The pair of locking

members

7, 7 are located on both outer sides of the back side portion 3 in the width direction W, and extend outward from both ends of the back side portion 3 in the width direction W. In the tape-type diaper 1, for example, the back side 3 is brought into contact with the wearer's back and the abdomen 2 is brought into contact with the abdomen, and then the pair of locking

members

7, 7 are attached to the abdomen 2 in the width direction W. By connecting to the joining target member 18 in the central portion, the wearer wears the diaper. In this case, in the tape-type diaper 1, for example, the front 1/3 region in the longitudinal direction L of the absorbent main body 10 is the abdominal part 2, the rear 1/3 region is the back part 3, and the central 1 The crotch portion 4 can be /3. The outer end 2e of the abdominal part 2 in the longitudinal direction L and the outer end 3e of the back part 3 in the longitudinal direction L define a waist opening through which the wearer's waist passes. Further, in the tape-type diaper 1, the pair of leg openings through which the wearer's legs pass is defined by the

side portions

5e and 5e on both sides of the crotch portion 4 in the width direction W. In another embodiment, the crotch portion 4 is not tied inside the width direction W.

In the present embodiment, the absorbent main body 10 is located between the liquid-permeable topsheet 12, the liquid-impermeable backsheet 13, and the topsheet 12 and the backsheet 13, and absorbs and retains the liquid. The absorber 14 is included. Examples of the surface sheet 12 include a liquid-permeable nonwoven fabric or woven fabric, a synthetic resin film having liquid-permeable holes formed therein, and a composite sheet of these. Examples of the back sheet 13 include liquid impermeable nonwoven fabrics, synthetic resin films, composite sheets of these, SMS nonwoven fabrics, and the like. In the present embodiment, the absorbent body 14 includes an absorbent core that absorbs and holds the liquid, and a core wrap that contains the absorbent core. Details of the absorber 14 will be described later. The absorber 14 and the topsheet 12 and the backsheet 13 are bonded with an adhesive, respectively, and the topsheet 12 and the backsheet 13 are bonded with an adhesive at their peripheral portions. Examples of the adhesive include known materials for tape-type diapers, such as hot-melt adhesive. The shape of the absorbent main body 10 is not particularly limited, and the shape used for the absorbent main body 10 of a known tape-type diaper can be adopted.

In the present embodiment, the absorbent main body 10 includes a pair of

side sheets

17, 17 located on both sides in the width direction W on the skin side surface and extending in the longitudinal direction L. Each side sheet 17 has a leak preventive wall 16 and fixing

regions

15 and 15. The fixing

regions

15 and 15 are located at the front and rear ends of the side seat 17 in the longitudinal direction L, and are fixed to the skin-side surface of the absorbent main body 10. The leak preventive wall 16 is located between and adjacent to the front and rear fixing regions 15 in the longitudinal direction L of the side sheet 17, is adjacent to the fixing regions 15, and is provided on the skin side surface of the absorbent main body 10 in the width direction W. The outer edge is fixed, and the inner edge in the width direction W is not fixed. In this case, the leak-proof wall 16 and the fixing

regions

15 and 15 are formed, for example, at the inner side portion of the side seat 17 in the width direction W, and the outer side portion of the side seat 17 in the width direction W is fixed to the absorbent main body 10. It Thus, the absorbent main body 10 includes the pair of leak-

proof walls

16, 16. The pair of leak

preventive walls

16 and 16 are arranged at both ends in the width direction W on the skin side of the absorbent main body 10 so as to face each other, and continuously extend along the longitudinal direction L. Each leak preventive wall 16 includes two elastic members 61 extending in the longitudinal direction L at the inner end in the width direction W. The elastic member 61 is exemplified by rubber thread. In another embodiment, each of the pair of leak

preventive walls

16 and 16 has an inner end in the width direction W folded back to the outer side in the width direction W. In another embodiment, the number of elastic members 61 is one or three or more. Each of the pair of

leakproof walls

16 and 16 is formed of a hydrophobic sheet, for example, a hydrophobic nonwoven fabric. In another embodiment, it is formed of a hydrophilic sheet, such as a hydrophilic nonwoven.

In the present embodiment, the absorbent main body 10 includes the liquid impermeable cover sheet 5 on the non-skin side of the back sheet 13. The cover sheet 5 and the back sheet 13 are laminated in the thickness direction T and bonded to each other with an adhesive or the like. The peripheral edge portion of the cover sheet 5 and the peripheral edge portions of the pair of

side sheets

17, 17 are laminated in the thickness direction T and are joined to each other with an adhesive or the like. In another embodiment, the back sheet 13 is omitted, and the non-skin side surface of the absorber 14 and the non-skin side surface of the peripheral portion of the top sheet 12 are joined to the cover sheet 5. Examples of the cover sheet 5 include any liquid-impermeable sheet such as a liquid-impermeable nonwoven fabric, a synthetic resin film, a composite sheet of these, an SB nonwoven fabric, and an SMS nonwoven fabric. Examples of the material of the cover sheet 5 include polyolefin-based materials such as polypropylene and polyethylene. The basis weight of the cover sheet 5 is, for example, 5 to 100 g/m ² , and preferably 10 to 50 g/m ² . The dimension (thickness) of the cover sheet 5 in the thickness direction T is, for example, 0.1 to 5 mm, preferably 0.1 to 2 mm. In another embodiment, there are two or more cover sheets 5.

In the present embodiment, the pair of locking

members

7, 7 are connected to both sides of the back side portion 3 in the width direction W, that is, the pair of

side portions

3F, 3F. The side portion 3F is formed by a laminated body of the side sheet 17 and the cover sheet 5. In another embodiment, a side flap separate from the absorbent main body 10 is formed instead of the side portion 3F or outside the width direction W of the side portion 3F. That is, the pair of side flaps are connected to both ends of the absorbent main body 10 in the width direction W. The side flap does not expand and contract in the width direction W. The locking member 7 is connected to the outer end of the side flap in the width direction W. The locking member 7 does not expand and contract in the width direction W. In another embodiment, the locking member 7 expands and contracts in the width direction W. Further, the side portion 3F does not expand and contract in the width direction W. In another embodiment, the side portion 3F expands and contracts in the width direction W. Moreover, in another embodiment, the side flap expands and contracts in the width direction W. Examples of the locking member 7 include a fastening tape and a hook of a surface fastener. Correspondingly, the joining target member 18 may be, for example, a nonwoven fabric or a loop of a surface fastener.

In the present embodiment, the absorbent main body 10 further includes the elastic member 6 on the back side portion 3. The elastic member 6 is a sheet-shaped member that can expand and contract in the width direction W, and is arranged in the center of the back side portion 3 in the width direction W so as to straddle the longitudinal centerline CL. The elastic member 6 is arranged, for example, between the pair of locking

members

7, 7 in the width direction W. The elastic member 6 functions as a waist gather, for example. The elastic member 6 is arranged between the absorber 14 and the topsheet 12 and the backsheet 13 on the back side 3. In another embodiment, the elastic member 6 is arranged between the absorber 14 and the backsheet 13 and the topsheet 12. In still another embodiment, the elastic member 6 is arranged at any position on the skin side surface of the topsheet 12 and the non-skin side surface of the backsheet 13. The elastic member 6 is joined to at least one adjacent member/sheet with an adhesive or the like. The material of the elastic member 6 is not particularly limited as long as it can be expanded and contracted, and it may be elastic in material, elastic in shape, and expandable in combination with an elastic member. May be. Examples of the material of the elastic member 6 include film-shaped elastic members such as polyurethane film and polystyrene film, sheet-shaped elastic members such as styrene-based rubber, olefin-based rubber and urethane-based rubber, and non-woven fabric and paper. A sheet-like elastic member or elastic nonwoven fabric in which the above are combined can be used. In addition to the elastic sheet, an elastic member such as rubber thread may be used, and a plurality of rubber threads may be arranged along the width direction W at intervals in the longitudinal direction L.

In this embodiment, the tape-type diaper 1 includes a plurality of elastic members 8 for leg gathers from the crotch portion 4 to the back side portion 3 and the abdominal side portion 2. The plurality of elastic members 8 are provided between the pair of

side sheets

17, 17 and the cover sheet 5, and extend mainly at both ends of the crotch portion 4 in the width direction W along the longitudinal direction L. The plurality of elastic members 8 respectively expand and contract the pair of leg openings, and are exemplified by a rubber thread.

Next, the absorber 14 will be described with reference to FIGS. 1 to 3. However, FIG. 3 is a diagram showing a configuration example of the absorber 14 according to the embodiment, (a) is a plan view, and (b) is a cross-sectional view taken along line IIIb-IIIb in (a). The absorber 14 is a layer having a liquid absorption performance and a liquid retention performance, and in the present embodiment, the first absorption layer 41 located on the skin side, the second absorption layer 42 located on the non-skin side, and the first And an intermediate layer 43 located between the absorption layer 41 and the second absorption layer 42. The absorber 14 has a two-layer structure in which the first absorption layer 41, the intermediate layer 43, and the second absorption layer 42 are laminated in this order in the thickness direction T. In addition, in another embodiment, the absorber 14 has a single-layer structure in which the intermediate layer 43 does not exist and the first absorption layer 41 and the second absorption layer 42 are integrated in the thickness direction. In still another embodiment, the absorber 14 has a multilayer structure of three or more layers in which another intermediate layer and another absorbing layer are further laminated between the first absorbing layer 41 and the second absorbing layer 42. In another embodiment, the first absorbent layer 41 is located on the skin side and the second absorbent layer 42 is located on the non-skin side.

In the present embodiment, the absorber 14 has a substantially rectangular planar shape extending in the longitudinal direction L. The absorber 14 can be regarded as having a first water absorbent material 45 and a second water absorbent material 47 as an absorbent core and a first base material 44 and a second base material 46 as core wraps. However, the shape is not particularly limited, and examples thereof include a rectangle with a short side protruding in an arc shape, a rounded rectangle, an ellipse, and an hourglass. The thickness of the absorber 14 is, for example, 0.5 to 20 mm, and preferably 1 to 10 mm. The basis weight of the absorbent body 14 can be appropriately adjusted depending on the absorption performance required for the pants-type diaper 1, and is, for example, 60 to 1600 g/m ² .

In the present embodiment, the first absorbent layer 41 is disposed on the intermediate layer 43 side of the first base material 44 and the first base material 44, which is formed of a sheet having liquid permeability, and absorbs water containing a water-absorbing polymer. A first water absorbing material 45 having a material. The first absorbent layer 41 can be regarded as having the first water absorbent material 45 as the absorbent core and the first base material 44 (and the intermediate layer 43) as the core wrap. In another embodiment, as the core wrap, in addition to the first base material 44 (and the intermediate layer 43 ), a core wrap sheet made of, for example, a tissue is provided that wraps the first water absorbing material 45 inside them. The first water-absorbing material 45 is formed by applying an adhesive to at least one of the surface of the first base material 44 on the side of the intermediate layer 43 and the surface of the intermediate layer 43 on the side of the first base material 44. It is fixed to at least one of the layers 43. The water absorbent material of the first water absorbent material 45 is arranged in the first absorbent layer 41 with a substantially uniform basis weight. However, the basis weight of the end portion in the longitudinal direction L and/or the width direction W may be gradually reduced toward the edge. In this case, the end portions are areas within 10% of the maximum dimension in the longitudinal direction L and/or the width direction W at both ends in the longitudinal direction L and/or the width direction W, for example. In another embodiment, the water absorbent material of the first water absorbent material 45 is arranged in the first absorbent layer 41 in a predetermined distribution having a portion having a large basis weight and a portion having a small basis weight. The first water absorbent material 45 has a substantially rectangular planar shape. The first base material 44 has a substantially rectangular planar shape and covers the first water absorbent material 45 from the skin side in a plan view, and the peripheral portion of the first base material 44 is slightly around the first water absorbent material 45. Extend outwards. The outer dimension (outer edge) of the first absorbent layer 41 in the plane direction is, for example, the outer dimension (outer edge) of the first water absorbent material 45 in the plane direction. The outer dimension (outer edge) is measured, for example, at a half position in the thickness direction T of the first water absorbent material 45.

In the present embodiment, the second absorbent layer 42 is disposed on the second base material 46 formed of a sheet having water retention and liquid diffusibility and on the intermediate layer 43 side with respect to the second base material 46, and the water absorbent polymer. A second water absorbing material 47 having a water absorbing material including. The second absorbent layer 42 can be regarded as having the second water absorbent material 47 as an absorbent core and the second base material 46 (and the intermediate layer 43) as a core wrap. In another embodiment, as the core wrap, in addition to the second base material 46 (and the intermediate layer 43 ), a core wrap sheet made of, for example, a tissue that wraps the second water absorbing material 47 inside them is provided. The second water-absorbing material 47 is formed on the intermediate layer 43 side of the second base material 46 and the adhesive applied to at least one of the surface of the intermediate layer 43 on the second base material 46 side. It is fixed to at least one of the layers 43. The water absorbing material of the second water absorbing material 47 is arranged in the second absorbing layer 42 with a substantially uniform basis weight except for the pair of channels 48, 48 (described later). However, the basis weight of the end portion in the longitudinal direction L and/or the width direction W may be gradually reduced toward the edge. In this case, the ends are as described above. In another embodiment, the water absorbing materials of the second water absorbing material 47 are arranged in the second absorbing layer 42 in a predetermined distribution having a portion having a large basis weight and a portion having a small basis weight. The second water absorbent material 47 has a substantially rectangular planar shape that is slightly larger than the first water absorbent material 45 in the width direction W and the longitudinal direction L. The second base material 46 has a substantially rectangular planar shape and covers the second water absorbent material 47 from the non-skin side in a plan view, and the peripheral edge portion of the second base material 46 is surrounded by the second water absorbent material 47. It extends slightly outside. At that time, both ends of the second base material 46 in the width direction W cover both side surfaces of the second water absorbent material 47, and also cover the skin-side surface of both ends of the first base material 44 in the width direction W. That is, on the skin-side surface of the end portion of the first absorbent layer 41 in the width direction W, the end portion of the second base material 46 in the width direction W and the end portion of the first base material 44 in the width direction W overlap each other. Are joined together. The outer dimension (outer edge) of the second absorbent layer 42 in the plane direction is, for example, the outer dimension (outer edge) of the second water absorbent material 47 in the plane direction. The outer size (outer edge) is measured at, for example, a half position in the thickness direction T of the second water absorbent material 47.

In this way, both ends of the second base material 46 in the width direction W cover the side surfaces of the second water absorbent material 47 in the width direction W, and further cover the side surfaces of the first base material 44 in the width direction W. The second water absorbent material 47 is sealed in the second absorbent layer 42 in the width direction W, and the first water absorbent material 45 is sealed in the first absorbent layer 41 in the width direction W. In another embodiment, both ends of the first base material 44 in the width direction W cover both ends of the second base material 46 in the width direction W. In still another embodiment, at both ends in the width direction W, the first base material 44, the intermediate layer 43, and the second base material 46 are stacked in the thickness direction T and joined.

In the present embodiment, the first base material 44, the intermediate layer 43, and the second base material 46 are laminated and joined in the thickness direction T at both ends in the longitudinal direction L of the absorber 14. Thereby, the second water absorbent material 47 is enclosed in the second absorbent layer 42 by the first base material 44 and the intermediate layer 43 in the longitudinal direction L, and the first water absorbent material 45 is intermediate with the second base material 46 in the longitudinal direction L. It is enclosed by the layer 43 in the second absorption layer 42. In another embodiment, both ends of the absorbent body 14 in the longitudinal direction L are not covered with the first base material 44 and the second base material 46.

In the present embodiment, the intermediate layer 43 is a liquid-permeable sheet and has a substantially rectangular planar shape. The intermediate layer 43 includes an upper layer 43a and a pair of

lower layers

43b and 43b adjacent to both sides in the width direction W on the non-skin side surface of the upper layer 43a. The intermediate layer 43 is formed by folding a pair of side portions located on both sides of the central portion in the width direction W back to the non-skin side of the central portion and stacking them on a sheet member having a substantially rectangular planar shape. At that time, the central portion of the sheet member becomes the upper layer 43a, and the pair of side portions of the sheet member becomes the pair of

lower layers

43b, 43b. Therefore, the portions on both sides of the intermediate layer 43 in the width direction W each have a two-layer structure in which the upper layer 43a and the lower layer 43b are stacked, and have a substantially rectangular shape extending in the longitudinal direction L. A portion 43d of the intermediate layer 43 near the center in the width direction W has a single-layer structure including only the upper layer 43a and has a substantially rectangular shape extending along the longitudinal direction L. The upper layer 43a and the lower layer 43b of the two-layer structure are joined by a pair of

heat seal portions

43c, 43c extending along the longitudinal direction L on both sides in the width direction W of the portion 43d. The heat seal portion 43c is formed by squeezing while heating. In another embodiment, the upper layer 43a and the lower layer 43b having a two-layer structure are joined by embossed portions extending along the longitudinal direction L on both sides in the width direction W of the portion 43d. The embossed portion is formed by pressing. In still another embodiment, the heat-sealing portion and the embossing portion have a plurality of points, a plurality of curved lines or a pattern. The intermediate layer 43 is sandwiched between both end edges in the width direction W by both end portions in the width direction W of the first base material 44 and the second base material 46, and both end edges in the longitudinal direction L are connected to the first base material 44 and the first base material 44. The two base materials 46 are sandwiched between both ends in the longitudinal direction L and are joined to each other. In another embodiment, both end edges in the longitudinal direction L are not sandwiched between the ends of the first base material 44 and the second base material 46 in the longitudinal direction L, and are not joined. With the two-layer structure, the liquid can be temporarily stored, and the time required for absorbing the superabsorbent polymer can be easily secured.

In the present embodiment, the absorber 14 has a pair of

channels

48, 48 extending along the longitudinal direction L. The pair of

channels

48, 48 are band-shaped regions that are located in the second absorption layer 42, extend in the longitudinal direction L, and are arranged at predetermined intervals on both sides in the width direction W with the longitudinal centerline CL interposed therebetween. The channel 48 is formed in at least the central portion in the longitudinal direction L so as to straddle the width-direction center line CW. In another embodiment, the channel 48 is formed so as to reach at least one of both edges in the longitudinal direction L. The pattern of the pair of channels 48 in the plan view is, for example, a pattern formed such that the interval between the two is constant along the longitudinal direction L. In another embodiment, the pattern of the pair of

channels

48, 48 is, for example, a pattern formed to be narrow near the center in the longitudinal direction L and expand toward both outer sides in the longitudinal direction L. Here, the channel 48 is an area in which the basis weight of the water absorbing material is smaller than the area around the channel in the absorber 14, and, for example, compared with the area around the channel 48 in the second absorbent layer 42. , A region where the basis weight of the water-absorbent material is small, including a case where the basis weight is zero. The channel 48 is formed such that the second base material 46 is recessed toward the intermediate layer 43 side, that is, the second water absorbing material 47 is recessed toward the intermediate layer 43 side. In another embodiment, the second water absorbing material 47 is formed so as to be recessed toward the second base material 46 side. Further, the pair of

channels

48, 48 overlaps the pair of

heat seal portions

43c, 43c in the thickness direction T. In another embodiment, at least a part of the channel 48 does not overlap the heat seal portion 43c in the thickness direction T. Note that, in another embodiment, the channel 48 extends not only in the longitudinal direction L but also in the width direction W as well as in the longitudinal direction L. In yet another embodiment, the channels 48 are one or more than two. In yet another embodiment, the channel 48 is formed in the first absorbent layer 41 instead of, or in addition to, the second absorbent layer 42. In yet another embodiment, the channel 48 is not formed.

As described above, the first water absorbent material 45 and the second water absorbent material 47 include a super absorbent polymer (SAP). The super absorbent polymer is not particularly limited as long as it is a polymer capable of absorbing and retaining water, and examples thereof include particulate or fibrous super absorbent polymers. The basis weight of the superabsorbent polymer of the first water absorbent material 45 and the second water absorbent material 47 can be appropriately adjusted according to the absorption performance required for the tape type diaper 1, and for example, each is 10 to 500 g/m ^2. It is preferably 100 to 400 g/m ² . One of the basis weights of the first water absorbent material 45 and the second water absorbent material 47 may be larger than the other, or may be the same. However, “equal” means a range where one is within ±30% of the other. The first water absorbent material 45 and the second water absorbent material 47 may further include hydrophilic fibers such as pulp fibers and water absorbent fibers. The ratio of the super absorbent polymer to the first water absorbent material 45 and the second water absorbent material 47 is, for example, 80 to 100% by mass, preferably 90 to 100% by mass, and more preferably 95 to 100% by mass. .. Therefore, it can be said that the first water absorbent material 45 and the second water absorbent material 47 contain the super absorbent polymer as a main component, and the absorber 14 can be called a so-called SAP sheet. However, as a ratio of the super absorbent polymer to the absorber 14 (including not only the first water absorbing material 45 and the second water absorbing material 47, but also the adhesive, the first base material 44, the intermediate layer 43, and the second base material 46). Is, for example, 40 to 80% by mass, preferably 50 to 80% by mass, and more preferably 60 to 80% by mass. In the present embodiment, the first water absorbent material 45 and the second water absorbent material 47 are made of only a super absorbent polymer and do not contain hydrophilic fibers. In another embodiment, the first water absorbent material 45 and the second water absorbent material 47 include pulp fibers and/or water absorbent fibers in addition to the super absorbent polymer.

Examples of superabsorbent polymers include starch-based, cellulose-based, and synthetic polymer-based polymer absorbents. Examples of the starch-based or cellulose-based superabsorbent polymer include starch-acrylic acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer, and crosslinked sodium carboxymethyl cellulose. Examples of synthetic polymer-based superabsorbent polymers include polyacrylic acid salt-based, polysulfonic acid salt-based, maleic acid anhydride-based, polyacrylamide-based, polyvinyl alcohol-based, polyethylene oxide-based, polyaspartate-based, polyglutamic acid. Examples thereof include salt-based, polyalginate-based, starch-based, cellulose-based and the like. In the present embodiment, a polyacrylic acid salt-based (particularly, sodium polyacrylate-based) superabsorbent polymer is preferable. Further, in the present embodiment, it is preferable that 90 to 100% by mass of the superabsorbent polymer in the absorber 14 is composed of superabsorbent polymer particles having a particle diameter of 150 to 500 μm. The superabsorbent polymer particles having such a particle size distribution have a small particle size and are uniform, so that they are easily held by the adhesive. The particle size of the super absorbent polymer particles is measured according to the sieving test method described in JIS R 6002:1998.

The adhesive is not particularly limited as long as it can fix the superabsorbent polymer, and examples thereof include hot melt adhesives. The application pattern of the adhesive is not particularly limited, and examples thereof include a continuous or intermittent omega pattern, a spiral pattern, and a line pattern. The basis weight of the adhesive can be appropriately adjusted so that the liquid absorbency of the absorbent body 14 is not significantly lowered, and for example, 3 to 50 g/m ² for each layer can be mentioned. However, each layer means an adhesive layer between the first water absorbent material 45 and the first base material 44, an adhesive layer between the first water absorbent material 45 and the intermediate layer 43, and a second water absorbent material 47. The adhesive layer is between the second base material 46 and the second water absorbing material 47 and the intermediate layer 43.

The first base material 44 is not particularly limited as long as it is a sheet having liquid permeability. Examples of the first base material 44 include liquid-permeable nonwoven fabrics, hydrophilic nonwoven fabrics, and laminated nonwoven fabrics thereof. Among them, nonwoven fabrics having high water permeability are preferable. For example, it is formed from polyolefin fibers such as polyethylene (PE), polypropylene (PP), polyester fibers such as polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT), polyethylene naphthalate (PEN), or a combination thereof. Spunbonded non-woven fabric and air-through non-woven fabric. These fibers are preferably hydrophilized by a known method. Alternatively, for example, an air-laid nonwoven fabric in which hydrophilic fibers such as pulp fibers and rayon fibers are coated with a hydrophilic binder, and a spunlace nonwoven fabric in which the above hydrophilic fibers and the above synthetic fibers are combined are included. In the present embodiment, an air-laid non-woven fabric having liquid permeability and liquid retention property, in which pulp fibers are coated with a hydrophilic binder, is used. As the first base material 44, one or a plurality of types of non-woven fabrics may be laminated in multiple layers. The basis weight of the first base material 44 is, for example, 10 to 100 g/m ² , and preferably 20 to 80 g/m ² . The thickness of the first base material 44 is, for example, 0.1 to 5 mm, and preferably 0.15 to 3 mm.

The second base material 46 is not particularly limited as long as it is a sheet having water retention and liquid diffusion properties. Examples of the second base material 46 include synthetic fibers such as polyamide fibers, recycled fibers such as rayon fibers and acetate fibers, natural fibers such as cotton, silk, hemp, and pulp (cellulose) fibers, or a combination thereof. A non-woven fabric formed from Specifically, for example, a spunbonded nonwoven fabric containing nylon and a spunlaced nonwoven fabric containing rayon fibers and/or pulp fibers can be mentioned. The spunlace nonwoven fabric containing rayon fibers and/or pulp fibers may contain polyolefin fibers and/or polyester fibers. In the present embodiment, a spunlace nonwoven fabric containing rayon fibers and pulp fibers, which has liquid retaining properties and liquid diffusing properties, is used. As the second base material 46, one or a plurality of types of non-woven fabrics may be laminated in a plurality of layers. The basis weight of the second base material 46 is, for example, 10 to 200 g/m ² , and preferably 35 to 150 g/m ² . The thickness of the second base material 46 is, for example, 0.1 to 5 mm, and preferably 0.15 to 3 mm.

The intermediate layer 43 is not particularly limited as long as it is a sheet having liquid permeability. As the intermediate layer 43, for example, a sheet similar to the first base material 44 can be used. The basis weight of the intermediate layer 43 is, for example, 10 to 100 g/m ² , and preferably 15 to 80 g/m ² . The thickness of the intermediate layer 43 is, for example, 0.1 to 5 mm, and preferably 0.15 to 3 mm.

In the present embodiment, as shown in FIG. 3, the absorbent body 14 includes a dorsal region BA, a ventral region FA, and a crotch region MA, which are arranged along the longitudinal direction L. However, the back side region BA is a region overlapping the back side portion 3 of the absorber 14 in the thickness direction T. The abdominal area FA is an area that overlaps the abdominal portion 2 of the absorber 14 in the thickness direction T. The crotch region MA is a region located between the back region BA and the abdominal region FA of the absorber 14, that is, a region overlapping the crotch portion 4 in the thickness direction T. Therefore, the absorbent body 14 is divided along the longitudinal direction L into a dorsal region BA overlapping the dorsal part 3, an abdominal region FA overlapping the abdominal part 2, and a crotch region MA overlapping the crotch part 4. To be done.

In the present embodiment, the absorber 14 also includes a high basis weight area 14a, a low basis weight area 14b, and a non-arranged area 14c. The high basis weight region 14a is a region in which the basis weight of the superabsorbent polymer is high, and is a region in which the first absorbent layer 41 and the second absorbent layer 42 overlap in the thickness direction T. The boundary between the high grammage region 14a and the low grammage region 14b is, for example, the outer edge of the first absorption layer 41. The low basis weight region 14b is a region in which the basis weight of the superabsorbent polymer is low, and the first absorbent layer 41 does not exist in the thickness direction T and only the second absorbent layer 42 exists. The boundary between the low basis weight area 14b and the non-arranged area 14c is, for example, the outer edge of the second absorbent layer. The non-arranged region 14c is a region that does not contain the superabsorbent polymer, and is a region in which the first absorption layer 41 and the second absorption layer 42 do not exist in the thickness direction T. However, not including the super absorbent polymer includes a case where the super absorbent polymer exists but its basis weight is very small. “Very low” means that the basis weight of the superabsorbent polymer is 5% or less of the basis weight of the superabsorbent polymer in the high basis weight region 14a. The high basis weight area 14a, the low basis weight area 14b, and the non-arrangement area 14c have a substantially rectangular shape. However, the shape is not particularly limited, and examples thereof include a rectangle with a short side protruding in an arc shape, a rounded rectangle, an ellipse, and an hourglass. Further, in a plan view, in the longitudinal direction L and the width direction W, the low basis weight region 14b is a region that surrounds the high basis weight region 14a in a substantially frame shape (encloses at least three sides), and the low basis weight region 14b. The outer size is, for example, 5 to 25% larger than the outer size of the high basis weight region 14a. The non-arrangement area 14c is an area that surrounds the low basis weight area 14b in a substantially frame shape, and the outer dimension of the non-arrangement area 14c is, for example, 3 to 15% larger than the outer dimension of the low basis weight area 14b. Further, the basic weight of the low basic weight area 14b is, for example, 40 to 60% of the basic weight of the high basic weight area 14a, and the basic weight of the non-arranged area 14c is, for example, 0% of the basic weight of the high basic weight area 14a. -5% is included. In addition, when it is difficult to distinguish into two regions, such as when the absorber 14 is a single layer that does not have the first absorbent layer 41 and the second absorbent layer 42, the high basis weight region is a water absorbing material (including an adhesive). Is the region of the maximum value to 50% of the maximum value. The low basis weight area is the area where the thickness of the water absorbing material (including adhesive) ranges from 50% to 5% of the maximum value, and the non-arrangement area is the thickness of the water absorbing material (including adhesive). Is the range of 5% to 0% of the maximum value. The thickness is the arithmetic average height (Ra: JIS B 0601-2001).

Therefore, in the absorber 14, the back side area BA is the back side high basis weight area BAa as the high basis weight area 14a, the back side low basis weight area BAb as the low basis weight area 14b, and the non-arrangement area 14c. Back non-arrangement area BAc of Further, in the absorber 14, the abdominal area FA includes an abdominal high basis weight area FAa as the high grammage area 14a and an abdominal non-arrangement area FAc as the non-arrangement area 14c. The crotch region MA has only the high basis weight region 14a. Therefore, the basis weight of the super absorbent polymer in the back side high basis weight region BAa and the abdominal side high basis weight region FAa is equivalent to the basis weight of the super absorbent polymer in the crotch region MA. The term “equivalent” means that one is in the range of 0.7 to 1.3 times (±30%) that of the other. In another embodiment, the abdominal area FA includes the abdominal low basis weight area FAb as the low basis weight area 14b in addition to the abdominal high basis weight area FAa and the abdominal non-arrangement area FAc.

Here, the second absorption layer 42 includes, at a rear end in the longitudinal direction L, a protrusion that protrudes outward from the edge of the first absorption layer 41 in a plan view. The protrusion includes the back side low basis weight region BAb, and in the present embodiment, the protrusion is the same as the back side low basis weight region BAb. The second absorbent layer 42 is covered with the intermediate layer 43, and thus the protruding portion, that is, the back side low basis weight region BAb is covered with the intermediate layer 43 and the first base material 44 on the skin side. Further, in the present embodiment, the second absorbent layer 42 includes, in a plan view, the width-direction protrusions that protrude outward from the end edges of the first absorption layer 41 at both ends in the width direction W. The width direction protrusion is covered with the intermediate layer 43 and the first base material 44 on the skin side. In another embodiment, the second absorbent layer 42 includes, at a front end in the longitudinal direction L, another protruding portion that protrudes outward from the edge of the first absorbent layer 41 in a plan view. Other protrusions include the ventral low basis weight area. In yet another embodiment, the protruding portion, that is, the back low-basis-weight area BAb is covered on the skin side by one of the intermediate layer 43 and the first base material 44 and not by the other. In yet another embodiment, the second absorbent layer 42 does not include a widthwise protruding portion that protrudes outward from the end edge of the first absorbent layer 41 at both end portions in the width direction W in a plan view.

FIG. 4 is an enlarged plan view of a part including the back side portion 3 of the tape type diaper according to the embodiment. In the present embodiment, the elastic member 6 of the back side portion 3 has a low elastic region 31 having low elasticity in the width direction W and a pair of high

elastic regions

32, 32 having high elasticity in the width direction W. The low expansion/contraction region 31 is a central portion of the elastic member 6 in the width direction W. The pair of high expansion/

contraction regions

32, 32 are adjacent to both sides of the low expansion/contraction region 31 in the width direction W. In the low expansion/contraction region 31, the elongation ratio ((length after expansion-original length)/(original length)) with respect to a predetermined tensile force in the width direction W is the elongation in the width direction W of the high expansion/contraction region 32. The ratio is 1/3 or less of the ratio, preferably 1/5 or less, and more preferably 1/10 or less. The low expansion/contraction region 31 is, for example, an elastic member, but is a region that is attached to various sheets or absorbers in a state where the region is not expanded and does not function much as an elastic member (does not expand or contract much). On the other hand, the high expansion/contraction region 32 is, for example, an elastic member, and is a region that is attached to various sheets or absorbers in a stretched state and functions as an elastic member. Therefore, the high elastic region 32 and the low elastic region 31 are defined by the region that functions as the elastic member and the region that does not function as the elastic member. The term “low elasticity” includes the case where elasticity does not occur. Correspondingly, it can be considered that the absorbent main body 10 has a low expansion/contraction region and a pair of high expansion/contraction regions overlapping the low expansion/contraction region 31 and the pair of high expansion/

contraction regions

32, 32 in the thickness direction T.

In the present embodiment, as shown in the drawing, in the width direction W, the pair of locking

members

7, 7 overlaps with the back side low basis weight area BAb which is a low basis weight area. In other words, an imaginary line connecting the rear (outside) edges of the pair of locking

members

7, 7 in the longitudinal direction L is set to line BL1, and an imaginary line connecting the front (inside) edges is set to line BL2. At this time, the region sandwiched between the line BL1 and the line BL2 and the back side low basis weight region BAb overlap in the thickness direction T. In that case, the pair of locking

members

7, 7 are joined to the joining target member 18 while being pulled outwards in the width direction W, so that the cover sheet 5 and the back sheet 13 between the pair of locking

members

7, 7 are joined together. The back side low basis weight area BAb can be pressed against the skin side. In this case, the tape-type diaper 1 does not necessarily need to have the elastic member 6.

In the present embodiment, as shown in the drawing, the elastic member 6 is overlapped with the back side low basis weight area BAb which is the low basis weight area in the plan view and therefore in the thickness direction T. In that case, the elastic members 6 can be pulled to both outer sides in the width direction W by joining the pair of locking

members

7 and 7 to the joining target member 18 while pulling to the outer sides in the width direction W, whereby The back side low basis weight area BAb can be pressed against the skin side by the elastic member 6 and the back sheet 13 laminated on the elastic member 6. In this case, the pair of locking

members

7, 7 may not overlap the back side low basis weight area BAb.

In the present embodiment, the rear portion of the channel 48 in the longitudinal direction L overlaps the low expansion/contraction region 31 in the thickness direction T. In plan view, the inner edge K in the width direction W of each of the pair of high expansion/

contraction regions

32, 32 has an edge 14EW facing the high expansion/contraction region 32 in the width direction W of the absorber 14 and a channel 48 ( And an edge 48E) in the width direction W of the. Therefore, of the absorbent body 14 including the rear side portion of the channel 48 in the longitudinal direction L, the central portion in the width direction W is hardly expanded in the width direction W by the low expansion/contraction region 31, and both end portions in the width direction W are paired. The high expansion/

contraction regions

32, 32 extend in the width direction W. Therefore, by pulling the pair of locking

members

7, 7 to the outside in the width direction W and joining them to the joining target member 18, the back side low basis weight area BAb can be pressed to the skin side as described above. .. In this case, if the high-elasticity region is arranged in the entire width direction W of the absorbent body 14, wrinkles in the width direction W may occur on the absorbent body 14 before mounting, but the central portion of the absorbent body 14 in the width direction W may be generated. Since the high expansion/contraction region is not provided in the absorbent core 14, it is possible to prevent wrinkles in the width direction W from being formed on the absorbent body 14 before mounting.

Next, a method for manufacturing the absorber 14 will be described.
First, the hot-melt adhesive is applied onto the sheet for the second base material 46 while moving the sheet for the second base material 46 in the longitudinal direction L. Then, the super absorbent polymer is supplied from the super absorbent polymer supply device along the longitudinal direction L on both end portions and the central portion in the width direction W of the sheet for the second base material 46 coated with the hot melt adhesive. And spray. At this time, a small amount of superabsorbent polymer migrates to a region (corresponding to a channel) between both end portions and the central portion. Next, the sheet for the intermediate layer 43, the hot melt adhesive of which is applied on both sides, is laminated on the super absorbent polymer on the sheet for the second base material 46. Next, while moving the laminate in the longitudinal direction L, a superabsorbent polymer is supplied from another superabsorbent polymer supply device to the central portion in the width direction W of the intermediate layer 43 sheet coated with the hot melt adhesive. Spray along the longitudinal direction L. Next, the sheet for the first base material 44 in which the hot melt adhesive is applied is laminated on the super absorbent polymer on the sheet for the intermediate layer 43, with the hot melt adhesive being on the super absorbent polymer side. Then, both sides of the sheet for the second base material 46 in the width direction W are folded back to both sides of the sheet for the first base material 44 in the width direction W to obtain a laminate. After that, the thickness of the laminate is adjusted by passing the laminate through a pair of press rolls, that is, by pressing, and the absorber 14 is obtained.

Next, a method of manufacturing the tape type diaper using the absorber 14 will be described.
The liquid-permeable surface sheet 12 is attached to the upper surface (the surface of the first base material 44) of the absorber 14 manufactured as described above, and the elastic member is attached to the lower surface of the absorbent body 14 (the surface of the second base material 46). A 6-liquid impermeable backsheet 13 is attached to obtain a laminate. Next, the leak preventive wall 16 and the side sheet 17 with the engaging member 7 are attached to both sides in the width direction W of the laminate to obtain the absorbent main body 10. After that, the absorbent main body 10 is attached to the cover sheet 5 (including the elastic member 8 and the joining target member 18), and the cover sheet 5 and the absorbent main body 10 are joined. Thereby, the tape type diaper 1 is manufactured.

FIG. 5 is a schematic diagram illustrating the effect of the tape-type diaper according to the embodiment. However, FIGS. 5A and 5B show a conventional technique, and FIG. 6B shows this embodiment. As a conventional technique, when an absorbent body containing a relatively large amount of superabsorbent polymer is applied to a tape-type diaper, as shown in FIG. The case where the body 114 is used is considered. In such a tape-type diaper, as shown in FIG. 5B, when the superabsorbent polymer absorbs a liquid (example: urine) and swells after being attached, the rigidity of the absorbent body 114 increases, The shape is relatively straight in the longitudinal direction. As a result, for example, the back side end portion 103 of the absorbent core in the longitudinal direction may deform the back side portion 103 of the tape type diaper into a shape protruding outward, as indicated by an arrow. is there. If this happens, the flatness of the back side portion 103 may be impaired, the fit of the tape-type diaper may be impaired, and liquid may leak from the gap created between the back side portion 103 and the skin surface. ..

On the other hand, in the tape type diaper of the present embodiment, the low basis weight region (back side low basis weight region BAb) in which the basis weight of the superabsorbent polymer is lower than that of the crotch region MA is the width of the pair of locking

members

7 and 7. It overlaps in the direction W. When such a tape-type diaper is attached to an infant, the pair of locking

members

7, 7 at both ends of the back side portion 3 are pulled outwards in the width direction W while the back side portion 3 is pressed against the back of the infant. , The pair of locking

members

7, 7 are locked to the abdominal portion 2. Thereby, when the back side part 3 is pressed against the back of the baby, as shown in FIG. 6(a), the thin and low rigidity low basis weight region at the end of the absorbent body 14 may be pressed against the back of the baby. it can. As a result, as shown in FIG. 6B, even if the super absorbent polymer swells after mounting, the thickness of the low basis weight region at the end of the absorbent body 14 before the swelling is thin, and the low basis weight region is low. Since the amount of super absorbent polymer is small, it does not easily become thick even if it swells, and the low basis weight region is pressed against the skin surface by the pair of locking

members

7, 7, etc. It is possible to suppress deformation into a shape that pops out. That is, it is possible to prevent the back side portion 3 from having a convex shape. As a result, it is possible to prevent the fit property of the tape-type diaper 1 from being impaired, and it is possible to prevent the liquid from leaking from the gap formed between the back side portion 3 and the skin surface.

Further, as a preferable mode in the present embodiment, as described above, the low basis weight area (back side low basis weight area BAb) overlaps the pair of locking

members

7, 7 in the width direction W, and the elastic member 6 is a flat surface. It visually overlaps with the low basis weight area. Therefore, even if the super absorbent polymer swells after mounting and the low basis weight region swells, the low basis weight region is pressed against the skin surface as the elastic member 6 moves toward the skin side due to the contracting force in the width direction W. By doing so, it is possible to further suppress the rear side portion 3 from being deformed into a shape protruding outward. As a result, it is possible to further suppress the fitting property of the tape-type diaper 1 from being impaired, and it is possible to further prevent liquid from leaking from the gap formed between the back portion 3 and the skin surface.

In the tape-type diaper of another embodiment, the low basis weight region (back side low basis weight region BAb) does not overlap the pair of locking

members

7, 7 in the width direction W, but the back side region BA has a low basis weight. A low-basis-weight area (back side low-basis area BAb) is included, and the low-basis-weight area overlaps with the elastic member 6 in the thickness direction T. Also in this case, as in the case described above, even if the superabsorbent polymer swells after mounting, the thickness of the low basis weight region (back side low basis weight region BAb) of the absorbent body 14 before the swelling is thin. Since there are few super absorbent polymers in the low grammage region, it is difficult for the swelling to become thick, and as the elastic member 6 moves toward the skin side due to the contracting force in the width direction W, the low grammage region is also pressed against the skin surface. It is possible to prevent the back side portion 3 from being deformed into a shape that pops out to the outside due to being twisted. That is, it is possible to prevent the back side portion from having a convex shape. As a result, it is possible to prevent the fit property of the tape-type diaper 1 from being impaired, and it is possible to prevent the liquid from leaking from the gap formed between the back side portion 3 and the skin surface.

FIG. 6 is an enlarged cross-sectional view of a part of the back side of the tape type diaper 1 according to the present embodiment. In a preferred mode of this embodiment, the elastic member 6 is located on the non-skin side of the absorber 14. Therefore, even if the super absorbent polymer swells after mounting and the low basis weight region (back side low basis weight region BAb; second absorbent layer 42) of the absorbent body 14 swells, the elastic member 6 contracts in the width direction W. As the force moves toward the skin side, that is, the absorber 14 side, the low-basis-weight region is also pushed from the non-skin side to the skin side by the elastic member 6 and pressed against the wearer's skin surface. Can be further suppressed from deforming into a shape that pops out.

In a preferred mode of this embodiment, the elastic member 6 is directly joined to the non-skin side surface of the absorber 14. Therefore, the stretching force of the stretchable member 6 can be directly transmitted to the absorber 14. Therefore, even if the super absorbent polymer swells after mounting and the low basis weight region (back side low basis weight region BAb; second absorbing layer 42) swells, the low basis weight region is expanded from the non-skin side by the elastic member 6. By being pressed to the skin side and pressed more firmly to the skin surface, it is possible to more reliably prevent the back side portion 3 from being deformed into a shape protruding outward.

In a preferred mode of this embodiment, the low expansion/contraction region 31 overlaps the low basis weight region (back side low basis weight region BAb of the absorber 14) in a plan view. Therefore, even if the entire elastic member 6 contracts, the low expansion/contraction region 31 is unlikely to contract, so that it is possible to make the low basis weight region difficult to contract. As a result, the low grammage region easily contracts and wrinkles are formed before mounting, or the wrinkles are partially concentrated to absorb the liquid, and the back side part 3 is deformed into a shape protruding outward. Can be suppressed. That is, even if the superabsorbent polymer swells after mounting and the low basis weight region swells, it is possible to further suppress the back side portion 3 from being deformed into a shape protruding to the outside.

As a preferable mode in the present embodiment, as shown in FIG. 4, in the longitudinal direction L, the length d2 of the portion of the elastic member 6 that overlaps the absorber 14 is shorter than the length d1 of the portion that does not overlap the absorber 14. .. Therefore, even if the elastic member 6 contracts as a whole, it is possible to make it difficult for the low basis weight region (back side low basis weight region BAb of the absorber 14) to contract. As a result, the low grammage region easily contracts and wrinkles are formed before mounting, or the wrinkles are partially concentrated to absorb the liquid, and the back side part 3 is deformed into a shape protruding outward. Can be suppressed. That is, even if the super absorbent polymer swells after mounting and the low basis weight region swells, the elastic member 6 can further suppress the back side portion 3 from being deformed into a shape protruding outward.

FIG. 7 is an enlarged cross-sectional view of a part of the back side of the tape type diaper 1 according to another embodiment. In another embodiment, as a preferable aspect, the elastic member 6 is located closer to the skin than the absorbent body 14, and the low basis weight area (back side low basis weight area BAb; second absorbent layer 42) is equivalent to the elastic member 6. It is not joined. Therefore, since the elastic member 6 is located on the skin side of the absorber 14, even if the super absorbent polymer swells after mounting and the low basis weight region swells, the elastic member 6 will contract due to the contracting force in the width direction W. The low grammage region can be pulled to the skin surface as it goes to the side. As a result, it is possible to suppress the back side portion 3 from being deformed into a shape protruding outward. Moreover, since the low basis weight region of the absorbent body 14 is not joined to the elastic member 6, a pocket-shaped portion can be formed between the low basis weight region and the elastic member 6. As a result, the elastic force of the elastic member 6 allows the back side portion 3 to be in close contact with the wearer's skin while receiving the liquid reaching the back side portion 3 in the pocket-shaped portion.

In the present embodiment, as a preferred mode, the absorber 14 has a two-layer structure in which the first absorbent layer 41 and the second absorbent layer 42 are laminated, and the low basis weight area (back side low basis weight area BAb) is In a plan view, it is included in a protruding portion of the end portion of the second absorption layer 42 that protrudes outward from the edge of the first absorption layer. That is, since the low grammage region is one layer of the second absorption layer 42, the thickness of the low grammage region can be surely reduced. As a result, it is possible to suppress the back side portion 3 from being deformed into a shape protruding outward.

In the present embodiment, as a preferred mode, a non-woven fabric intermediate layer 43 is provided on the skin side of the second absorbent layer 42, and the skin side surface of the low basis weight area (back side low basis weight area BAb; second absorbent layer 42). Is covered with a non-woven fabric (middle layer 43). Therefore, the super absorbent polymer in the low grammage region (second absorption layer 42) can be made harder to move, and thereby the thickness in the low grammage region can be more reliably kept thin. Further, when the back side portion 3 is in close contact with the skin surface, even if the low basis weight region of the absorber 14 is pressed against the skin surface, the skin side surface of the low basis weight region is covered with the non-woven fabric, so The unevenness due to the water-absorbent polymer is not felt, and it is possible to make it difficult to feel discomfort during mounting. Thereby, it is possible to prevent the fitting property from being impaired.

The tape-type diaper and the absorbent body of the present invention are not limited to the above-described embodiments, and the objects and the purpose of the present invention can be combined with each other and the known techniques can be applied without departing from the spirit of the present invention. It is possible to do so.

1 Tape-type diaper 2 Ventral part 3 Dorsal part 4 Crotch part 7 Locking member 10 Absorbent body 14 Absorber BA Dorsal region BAb (Dorsal) low basis weight region FA Ventral region MA Crotch region

Claims

It has a longitudinal direction, a width direction, and a thickness direction that are orthogonal to each other, and includes an absorber, and is a ventral side portion located on the front side in the longitudinal direction, a back side portion located on the rear side, and the ventral side portion and the spine. An absorptive main body having a crotch portion located between the side portion, and a pair of locking members positioned on both outer sides in the width direction of the back side portion, a tape type diaper,
The absorber is
Including super absorbent polymer,
Crotch area,
A dorsal region adjacent to the rear side in the longitudinal direction of the crotch region,
An abdominal region adjacent to the front side in the longitudinal direction of the crotch region,
The back side region includes a low basis weight region in which the basis weight of the superabsorbent polymer is lower than the crotch region,
In the width direction, the pair of locking members overlaps with the low basis weight region,
Tape type diaper.
Between the pair of locking members in the back side portion, further comprising an elastic member that can expand and contract in the width direction,
The elastic member overlaps the low basis weight region in a plan view,
The tape-type diaper according to claim 1.
It has a longitudinal direction, a width direction, and a thickness direction that are orthogonal to each other, and includes an absorber, and is a ventral side portion located on the front side in the longitudinal direction, a back side portion located on the rear side, and the ventral side portion and the spine. An absorptive main body having a crotch portion located between the side portion, and a pair of locking members positioned on both outer sides in the width direction of the back side portion, a tape type diaper,
Between the pair of locking members in the back side portion, further comprising an elastic member that can expand and contract in the width direction,
The absorber is
Including super absorbent polymer,
Crotch area,
A dorsal region adjacent to the rear side in the longitudinal direction of the crotch region,
An abdominal region adjacent to the front side in the longitudinal direction of the crotch region,
The back side region includes a low basis weight region in which the basis weight of the superabsorbent polymer is lower than the crotch region,
The elastic member overlaps the low basis weight region in a plan view,
Tape type diaper.
The elastic member is located on the non-skin side of the absorber,
The tape type diaper according to claim 2 or 3.
The elastic member is directly joined to the non-skin side surface of the absorber,
The tape type diaper according to claim 4.
The elastic member is
Located in the central portion in the width direction, extending from the front edge in the longitudinal direction to the rear side, a low elasticity region having low elasticity in the width direction,
Adjacent to both sides in the width direction of the low elasticity region, a pair of high elasticity regions having high elasticity in the width direction,
Have
The low-elasticity region overlaps with the low-basis-weight region in plan view,
The tape type diaper according to claim 4 or 5.
In the longitudinal direction, the length of the portion of the elastic member that overlaps the absorber is shorter than the length of the portion that does not overlap the absorber,
The tape type diaper according to any one of claims 4 to 6.
The elastic member is located on the skin side of the absorber,
The low basis weight region is not joined to the elastic member,
The tape type diaper according to claim 2 or 3.
The absorber is
A first absorbent layer containing the superabsorbent polymer,
A second absorbent layer located on the non-skin side of the first absorbent layer and containing the superabsorbent polymer;
Further equipped with,
The second absorbent layer includes, in plan view, a projecting portion projecting outward from an end edge of the first absorbent layer at a rear end portion in the longitudinal direction,
The protrusion includes the low basis weight region,
The tape type diaper according to any one of claims 1 to 8.
The absorbent body is further provided with an intermediate layer which is located between the first absorbent layer and the second absorbent layer and is made of a nonwoven fabric,
The skin side surface of the low basis weight area is covered with the intermediate layer,
The tape-type diaper according to claim 9.