CN111374830A

CN111374830A - Belt type diaper

Info

Publication number: CN111374830A
Application number: CN201911214832.2A
Authority: CN
Inventors: 川上祐介; 高居义; 沈莲莲
Original assignee: Unicharm Corp
Current assignee: Unicharm Corp
Priority date: 2018-12-29
Filing date: 2019-12-02
Publication date: 2020-07-07
Also published as: JP2020108751A; WO2020137426A1; CN212214032U

Abstract

Provided is a tape-type diaper which can suppress a decrease in fit and can suppress leakage of liquid. A tape-type diaper (1) comprises: an absorbent body (10) comprising an absorbent body (14) having a stomach-side section (2), a back-side section (3), and a crotch section (4); and a pair of locking members (7, 7) located on both outer sides in the width direction of the back section (3). The absorbent body comprises a super absorbent polymer, and is provided with a back-side region (BA), a crotch region (MA), and a stomach-side region (FA). The back-side region includes a low basis weight region (BAb) in which the weight per unit area of the super absorbent polymer is lower than the weight per unit area of the super absorbent polymer in the crotch region. The pair of engaging members overlap the low area weight region in the width direction.

Description

Belt type diaper

Technical Field

The present invention relates to a belt-type diaper.

Background

As an absorbent material, an absorbent article using an absorbent containing a relatively large amount of Super Absorbent Polymer (SAP) is known. An absorbent material containing a relatively large amount of superabsorbent polymer (so-called SAP sheet) is thin, and therefore can improve wearability, fit, and the like, and is therefore preferable. As such an absorbent body, for example, patent document 1 discloses an absorbent core including an absorbent material. The absorbent core is used in an absorbent article, the absorbent material being substantially free of cellulose fibers, forming a pattern of individual absorbent material zones. The pattern includes at least one of a region extending in a width direction and a region extending in a length direction and a dot formation region.

Documents of the prior art

Patent document

Patent document 1: japanese Kohyo publication No. 2017-516542

Disclosure of Invention

Problems to be solved by the invention

When an absorbent body containing a relatively large amount of superabsorbent polymer is applied to a belt-type diaper, it is considered that the absorbent body is formed by substantially uniformly arranging the superabsorbent polymer in a planar shape. In such a belt-type diaper, when the super absorbent polymer absorbs liquid (exemplified by urine) and swells after wearing, the rigidity of the absorbent body is increased, and the absorbent body has a relatively straight shape in the longitudinal direction. As a result, for example, the following possibilities exist: the belt-type diaper is deformed into a shape in which the back side portion of the belt-type diaper protrudes outward by the longitudinal direction back side end portion of the absorber. In this case, the flatness of the back side portion is impaired, and the fitting property of the tape-type diaper may be impaired, and liquid may leak from a gap formed between the back side portion and the skin surface.

Here, in order to improve wearing comfort and the like, the absorbent body (absorbent core) of patent document 1 is divided into a plurality of regions in a plan view. However, no consideration is given to the case where the absorbent body has a shape that protrudes outward after the belt-type diaper is worn, because the absorbent body absorbs liquid.

The purpose of the present invention is to provide a belt-type diaper which contains a superabsorbent polymer and which is capable of suppressing a decrease in fit and suppressing leakage of liquid.

Means for solving the problems

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

In the belt-type diaper of the present invention, the low basis weight region in which the superabsorbent polymer has a lower basis weight than the crotch region is overlapped with the pair of locking members in the width direction. When such a belt-type diaper is worn on an infant, the pair of locking members at both ends of the back-side portion are pulled outward in the width direction to press the back-side portion against the back of the infant, and the pair of locking members are locked to the abdomen-side portion. Therefore, by pressing the dorsal portion against the back of the infant, it is possible to press the thin and low-rigidity low-area-weight region against the back of the infant. Thus, even if the super absorbent polymer swells after wearing, the deformation of the back side portion to such a shape as to protrude outward can be suppressed due to the following factors and the like: the low areal weight region has a relatively thin thickness before swelling; since the superabsorbent polymer in the low area weight region is less, it is difficult to thicken even if swollen; the low area weight region is pressed against the skin surface by the pair of locking members. That is, the back side portion can be suppressed from being convex. This can suppress the adhesive property from being impaired, and can suppress the leakage of liquid from the gap formed between the back side portion and the skin surface.

The belt-type diaper of the present invention may be (2) the belt-type diaper according to the above (1), further comprising an extensible member that is extensible and contractible in the width direction between the pair of locking members in the back portion, the extensible member overlapping the low basis weight region in a plan view.

In the belt diaper, the stretchable member overlaps with the low basis weight region of the back-side region of the absorber. Therefore, even when the super absorbent polymer swells and the low basis weight region swells after wearing, the low basis weight region is pressed against the skin surface as the stretchable member moves toward the skin side by the force of the contraction in the width direction, and thus the deformation of the back side portion into a shape protruding outward can be further suppressed. This can further suppress the deterioration of the adhesiveness and further suppress the leakage of liquid from the gap between the back side portion and the skin surface.

The tape diaper of the present invention is (3) a tape diaper having a longitudinal direction, a width direction, and a thickness direction which are orthogonal to each other, and including: an absorbent body including an absorber having a front side portion located on the front side in the longitudinal direction, a back side portion located on the back side, and a crotch portion located between the front side portion and the back side portion; and a pair of locking members located on both outer sides of the back portion in the width direction, wherein an extensible member that is extensible and contractible in the width direction is further provided between the pair of locking members of the back portion, the absorbent body contains a super absorbent polymer, and the absorbent body includes: a crotch region; a back-side region adjacent thereto on a back side in the longitudinal direction of the crotch region; and a ventral region adjacent to the front side in the longitudinal direction of the crotch region, wherein the dorsal region includes a low basis weight region in which the basis weight of the superabsorbent polymer is lower than the basis weight of the superabsorbent polymer in the crotch region, and the extensible member overlaps with the low basis weight region in a plan view.

In the belt-type diaper of the present invention, the back-side region includes the low basis weight region, and the low basis weight region overlaps with the stretchable member in the thickness direction. In this tape-type diaper, even if the super absorbent polymer swells after wearing, the deformation of the back side portion to the shape protruding outward can be suppressed due to the following factors and the like: the low areal weight region has a relatively thin thickness before swelling; since the superabsorbent polymer in the low area weight region is less, it is difficult to thicken even if swollen; the stretchable member is pushed toward the skin by a contractile force in the width direction, and accordingly, the low basis weight region is also pressed against the skin surface. That is, the back side portion can be suppressed from being convex. This can suppress the adhesive property from being impaired, and can suppress the leakage of liquid from the gap formed between the back side portion and the skin surface.

The tape diaper of the present invention may be (4) the tape diaper according to (2) or (3), wherein the stretchable member is located on a non-skin side of the absorbent body.

In the belt-type diaper, the stretchable member is located on the non-skin side of the absorbent body. Therefore, even when the super absorbent polymer swells and the low basis weight region swells after wearing, the low basis weight region is pressed from the non-skin side to the skin side by the stretchable member and is pressed against the skin surface as the stretchable member moves toward the skin side by the force of the contraction force in the width direction of the stretchable member, whereby the deformation of the back side portion into a shape protruding outward can be further suppressed. This can further suppress the deterioration of the adhesiveness and further suppress the leakage of liquid from the gap between the back side portion and the skin surface.

The tape diaper of the present invention may be (5) the tape diaper according to (4) above, wherein the stretchable member is directly joined to the non-skin side surface of the absorbent body.

In the belt-type diaper of the present invention, the stretchable member is directly joined to the non-skin-side surface of the absorbent body, and therefore the stretching force of the stretchable member can be directly transmitted to the absorbent body. Therefore, even if the super absorbent polymer swells after wearing and the low basis weight region swells, the low basis weight region is pressed more reliably against the skin surface by the stretchable member from the non-skin side to the skin side, and thus the deformation of the back side portion into a shape protruding outward can be more reliably suppressed. This can further suppress the deterioration of the adhesiveness and further suppress the leakage of liquid from the gap between the back side portion and the skin surface.

The tape diaper according to the present invention may be (6) the tape diaper according to (4) or (5), wherein the stretchable member includes: a low stretch region located at a central portion in the width direction, extending from an end edge on a front side in the longitudinal direction to a rear side, and having low stretchability in the width direction; and a pair of high expansion and contraction regions adjacent to the low expansion and contraction region on both sides in the width direction, the high expansion and contraction region having high expansion and contraction properties in the width direction, and the low expansion and contraction region overlapping with the low unit area weight region in a plan view.

In the belt diaper, the low stretch region and the low basis weight region of the stretch member overlap each other. Therefore, even if the entire stretchable member is contracted, the low basis weight region (absorbent body) can be made less likely to contract, and therefore, it is possible to suppress the low basis weight region (absorbent body) from being easily contracted to cause wrinkles before wearing, or the backside 3 from being deformed to protrude outward due to local concentration of liquid absorption at the wrinkles that have occurred. That is, even if the super absorbent polymer swells after wearing and the low basis weight region swells, the deformation of the back side portion into a shape protruding outward can be further suppressed. This can further suppress the deterioration of the adhesiveness and further suppress the leakage of liquid from the gap between the back side portion and the skin surface.

The tape diaper of the present invention may be (7) the tape diaper according to any one of (4) to (6), wherein a length of a portion of the stretchable member which overlaps the absorbent body is shorter than a length of a portion which does not overlap the absorbent body in the longitudinal direction.

In the belt diaper, the length of the portion of the stretchable member which overlaps the absorbent body is shorter than the length of the portion which does not overlap the absorbent body. Therefore, even if the stretchable member as a whole is contracted, the low basis weight region (absorbent body) can be made less likely to be contracted. This can suppress the low basis weight region from easily contracting to cause wrinkles before wearing, or the occurrence of wrinkles in which the liquid absorption is locally concentrated and the back portion 3 is deformed to protrude outward. That is, even if the super absorbent polymer swells after wearing and the low basis weight region swells, the deformation of the back side portion into a shape protruding outward can be further suppressed by the stretchable member. This can further suppress the deterioration of the adhesiveness and further suppress the leakage of liquid from the gap between the back side portion and the skin surface.

The tape diaper of the present invention may be (8) the tape diaper according to (2) or (3), wherein the stretchable member is positioned on the skin side of the absorbent body,

the low area weight region is not engaged with the telescoping member.

In the belt-type diaper, the stretchable member is positioned closer to the skin than the absorbent body. Therefore, even if the super absorbent polymer swells and the low basis weight region swells after wearing, the low basis weight region is pulled toward the skin surface as the stretchable member moves toward the skin due to the force of contraction in the width direction, and thus the deformation of the back side portion to the outward side can be suppressed. In addition, the low basis weight region of the absorbent body of the belt diaper of the present invention is not joined to the stretchable member. Therefore, a bag-like portion can be formed between the low basis weight region and the stretchable member. Thus, the liquid reaching the back side portion can be received by the bag-like portion while the back side portion is brought into close contact with the skin of the wearer by the elastic force of the elastic member. Therefore, the adhesion can be more suppressed from being impaired, and the liquid can be more suppressed from leaking from the gap generated between the back side portion and the skin surface.

The tape diaper of the present invention may be (9) the tape diaper according to any one of (1) to (8), wherein the absorbent body further includes: 1 st absorption layer comprising the superabsorbent polymer; and a 2 nd absorbent layer which is located on the non-skin side of the 1 st absorbent layer and contains the super absorbent polymer, wherein the 2 nd absorbent layer contains a protruding portion which protrudes to an outer side than an end edge of the 1 st absorbent layer at a rear end portion in the longitudinal direction in a plan view, and the protruding portion contains the low basis weight region.

In the belt-type diaper, the absorber has a two-layer structure in which the 1 st absorbent layer and the 2 nd absorbent layer are laminated, and the low basis weight region includes a protruding portion that protrudes to the outside of the end edge of the 1 st absorbent layer, among the end portions of the 2 nd absorbent layer in a plan view. Therefore, the thickness of the low basis weight region can be reliably reduced. This can suppress deformation of the back side portion to the shape protruding outward. This can suppress the adhesive property from being impaired, and can suppress the leakage of liquid from the gap formed between the back side portion and the skin surface.

The tape diaper of the present invention may be (10) the tape diaper according to (9) above, wherein the absorbent body further includes an intermediate layer made of a nonwoven fabric and located between the 1 st absorbent layer and the 2 nd absorbent layer, and the skin-side surface of the low basis weight region is covered with the intermediate layer.

In the belt-type diaper of the present invention, the intermediate layer of nonwoven fabric is provided on the skin side of the 2 nd absorbent layer, and the skin side surface of the low basis weight region is covered with the nonwoven fabric (intermediate layer). Therefore, the superabsorbent polymer in the low basis weight region can be made hard to move, and thus the thickness of the low basis weight region can be maintained thinner more reliably. Further, even when the back side portion is brought into close contact with the skin surface, the skin surface of the low basis weight region of the absorbent body is covered with the nonwoven fabric, and therefore, unevenness due to the super absorbent polymer is not felt, and a feeling of discomfort during wearing can be hardly felt. This can suppress the adhesive property from being impaired, and can suppress the leakage of liquid from the gap formed between the back side portion and the skin surface.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, a tape-type diaper can be provided which contains a super absorbent polymer, wherein the tape-type diaper can suppress a decrease in fit and can suppress leakage of liquid.

Drawings

Fig. 1 is a plan view showing a configuration example of a belt-type diaper according to an embodiment.

Fig. 2 is a sectional view taken along line II-II of fig. 1.

Fig. 3 is a plan view and a sectional view showing a configuration example of the absorber of the embodiment.

Fig. 4 is a partially enlarged plan view of the back side portion of the belt-type diaper according to the embodiment.

Fig. 5 is a schematic view illustrating the effect of the belt-type diaper of the embodiment.

Fig. 6 is a partially enlarged cross-sectional view of the back side portion of the belt-type diaper according to the embodiment.

Fig. 7 is a partially enlarged cross-sectional view of a back side portion of a belt-type diaper according to another embodiment.

Description of the reference numerals

1: belt type diaper

2: ventral part

3: back side part

4: crotch part

7: locking member

10: absorbent body

14: absorbent body

BA: back side area

BAb: (backside) Low basis weight region

FA: ventral region

MA: crotch area

Detailed Description

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

Fig. 1 and 2 are views showing a configuration example of a belt-type diaper 1 according to an embodiment. Fig. 1 is a plan view showing a state where a belt type diaper 1 is unfolded, and fig. 2 is a sectional view taken along line II-II of fig. 1. The belt-type diaper 1 has a longitudinal direction L, a width direction W, and a thickness direction T which are orthogonal to each other in the state shown in fig. 1, and has a longitudinal direction center line CL which passes through the center of the width direction W and extends in the longitudinal direction L, and a width direction center line CW which passes through the center of the length direction L and extends in the width direction W. The direction and the side close to the longitudinal center line CL are set as the inward direction and the inward side in the width direction W, respectively, and the direction and the side away from the longitudinal center line CL are set as the outward direction and the outward side in the width direction W, respectively. The direction and the side closer to the width direction center line CW are set as the inward direction and the inward side in the longitudinal direction L, respectively, and the direction and the side farther from the width direction center line CW are set as the outward direction and the outward side in the longitudinal direction L, respectively. The side of the belt-type diaper 1 facing the end edge of the belt-type diaper 1 corresponding to the abdomen of the wearer (the end edge on the abdomen side) in the longitudinal direction L is also referred to as the front side in the longitudinal direction L, and the side of the belt-type diaper 1 facing the end edge of the belt-type diaper 1 corresponding to the back of the wearer (the end edge on the back side) is also referred to as the rear side in the longitudinal direction L. The "plan view" refers to the belt-type diaper 1 in a state where a plane including the longitudinal direction L and the width direction W is developed as viewed from above in the thickness direction T, and the "plan view" refers to a shape grasped in the plan view. The "planar direction" is an arbitrary direction parallel to a plane including the width direction W and the length direction L. The "skin side" and the "non-skin side" refer to a side relatively close to the skin surface of the wearer and a side far from the skin surface of the wearer in the thickness direction T when the belt diaper 1 is worn on the wearer, respectively. These definitions apply not only to the tape diaper 1 but also to the absorbent body of the tape diaper 1 and the respective materials disposed thereon.

The member, structure, shape, and the like extend along the longitudinal direction L, and include not only a case where the member and the like are parallel to the longitudinal direction L, but also a case where the component Dx in the longitudinal direction L of the member and the like is larger than the component Dy in the width direction W of the member and the like (Dx > Dy). Similarly, the member or the like extends in the width direction W, and includes not only a case where the member or the like is parallel to the width direction W but also a case where the component Dy in the width direction W of the member or the like is larger than the component Dx in the longitudinal direction L of the member or the like (Dy > Dx). For a curved or curved member, the member is evaluated as described above with respect to the tangent line at each point on the curve or the like.

As shown in fig. 1, the belt diaper 1 includes an absorbent body 10 and a pair of locking

members

7, 7. The absorbent main body 10 includes an absorbent body 14, and has a front side portion 2 located on the front side in the longitudinal direction L, a back side portion 3 located on the back side, and a crotch portion 4 located between the front side portion 2 and the back side portion 3. The abdomen portion 2 is a portion that abuts against the abdomen of the wearer. The back portion 3 is a portion that abuts against the hip or the back of the wearer. The crotch portion 4 is a portion that abuts against the crotch of the wearer, and is constricted inward in the width direction W. The pair of locking

capsules

7, 7 are positioned on both outer sides in the width direction W of the back portion 3, and extend outward from both end portions in the width direction W of the back portion 3. The belt-type diaper 1 is worn on a wearer by, for example, bringing the back portion 3 into contact with the back of the wearer and the abdominal portion 2 into contact with the abdomen, and then connecting the pair of locking

members

7, 7 to the member 18 to be joined at the center portion in the width direction W of the abdominal portion 2. In this case, in the belt-type diaper 1, for example, the front side 1/3 region in the longitudinal direction L of the absorbent main body 10 can be defined as the stomach-side portion 2, the rear side 1/3 region can be defined as the back-side portion 3, and the center 1/3 region can be defined as the crotch portion 4. A waist opening through which the waist of the wearer passes is defined by the outer end 2e of the stomach-side portion 2 in the longitudinal direction L and the outer end 3e of the back-side portion 3 in the longitudinal direction L. In the belt-type diaper 1, the pair of leg openings through which the legs of the wearer pass are defined by the

side portions

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

In the present embodiment, the absorbent body 10 includes a liquid-permeable front sheet 12, a liquid-impermeable back sheet 13, and an absorbent body 14 that is located between the front sheet 12 and the back sheet 13 and absorbs and retains liquid. Examples of the top sheet 12 include a liquid-permeable nonwoven fabric, a woven fabric, a synthetic resin film having liquid-permeable holes formed therein, and a composite sheet thereof. Examples of the back sheet 13 include liquid-impermeable nonwoven fabric, synthetic resin film, composite sheets thereof, and SMS nonwoven fabric. The absorbent body 14 in the present embodiment includes an absorbent core for absorbing and retaining liquid and a core wrap enclosing the absorbent core. The absorbent body 14 will be described in detail later. The absorbent body 14, the front sheet 12, and the back sheet 13 are bonded together with an adhesive, and the front sheet 12 and the back sheet 13 are bonded together with an adhesive at their peripheral edge portions. The adhesive is a material known for tape diapers, and examples thereof include hot melt adhesives. The shape of the absorbent main body 10 is not particularly limited, and a shape used for the absorbent main body 10 of a known tape-type diaper can be adopted.

In the present embodiment, the surface of the absorbent main body 10 on the skin side includes a pair of

side sheets

17 and 17 located on both sides in the width direction W and extending in the longitudinal direction L. Each side sheet 17 has a leakage preventing wall 16 and

fastening regions

15, 15. The

fastening regions

15, 15 are positioned at the front and rear ends of the side sheet 17 in the longitudinal direction L and are fastened to the skin-side surface of the absorbent main body 10. The leakage preventing wall 16 is positioned between the front and

rear fixing regions

15, 15 in the longitudinal direction L of the side sheet 17, is adjacent thereto, and is fixed at the outer end edge in the width direction W of the leakage preventing wall 16 on the skin-side surface of the absorbent main body 10, and is non-fixed at the inner end edge in the width direction W of the leakage preventing wall 16. In this case, the leakage preventing walls 16 and the

fastening regions

15, 15 are formed by, for example, inner portions of the side sheets 17 in the width direction W, and outer portions of the side sheets 17 in the width direction W are fastened to the absorbent main body 10. In this manner, the absorbent main body 10 includes the pair of

leakage preventing walls

16, 16. The pair of

leakage preventing walls

16, 16 are disposed so as to face each other at both end portions in the width direction W on the skin side of the absorbent main body 10, and extend continuously along the longitudinal direction L. Each of the leakage preventing walls 16 includes two elastic members 61 extending in the longitudinal direction L at inner ends in the width direction W. The elastic member 61 is exemplified as a rubber band. In another embodiment, the pair of

leakage preventing walls

16 and 16 are folded back such that the inner ends in the width direction W are further folded back toward the outer sides in the width direction W. In another embodiment, the number of the elastic members 61 is one or more than three. The pair of

leakage preventing walls

16, 16 are each formed of a hydrophobic sheet, such as a hydrophobic nonwoven fabric. In another embodiment, it is formed of a hydrophilic sheet, such as a hydrophilic nonwoven fabric.

In the present embodiment, the absorbent main body 10 is provided with a 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 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 absorbent body 14 and the non-skin side surface of the peripheral edge 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 thereof, an SB nonwoven fabric, and an SMS nonwoven fabric. Examples of the material of the cover sheet 5 include polyolefin materials such as polypropylene and polyethylene. The weight per unit area of the cover sheet 5 is, for example, 5g/m²～100g/m²Preferably 10g/m²～50g/m². The dimension (thickness) of the cover sheet 5 in the thickness direction T is, for example, 0.1mm to 5mm, preferably 0.1mm to 2 mm. In another embodiment, there are two or more cover sheets 5.

In the present embodiment, the pair of locking

capsules

7, 7 are connected to the pair of side portions 3F, which are portions on both sides of the back portion 3 in the width direction W. The side portion 3F is formed by a laminate of the side sheet 17 and the cover sheet 5. In another embodiment, side flaps that are separate from the absorbent main body 10 are formed instead of the side portions 3F or on the outer sides of the side portions 3F in the width direction W. That is, the pair of flaps are connected to both ends of the absorbent main body 10 in the width direction W. The side flaps do not extend and contract in the width direction W. The locking capsule 7 is connected to the outer end of the side flap in the width direction W. The locking capsule 7 does not expand or contract in the width direction W. In another embodiment, the locking capsule 7 expands and contracts in the width direction W. In addition, the side portions 3F do not expand and contract in the width direction W. In another embodiment, the side portion 3F is stretchable and contractible in the width direction W. In another embodiment, the side flaps extend and contract in the width direction W. Examples of the locking member 7 include a hook and loop fastener and a hook of a surface fastener. In response to this, examples of the joining target member 18 include a nonwoven fabric and a loop of a surface fastener.

In the present embodiment, the absorbent main body 10 further includes the extensible member 6 in the back portion 3. The extensible member 6 is a sheet-like member that is extensible in the width direction W, and is disposed at the center of the back portion 3 in the width direction W so as to straddle the longitudinal center line CL. The expansion member 6 is disposed between the pair of locking

members

7, 7 in the width direction W, for example. The extensible member 6 functions as, for example, a waist gather. The stretchable member 6 is disposed between the absorbent body 14 and the back sheet 13 and between the front sheet 12 and the back sheet 13 of the back section 3. In another embodiment, the stretchable member 6 is disposed between the absorbent body 14 and the front sheet 12 and between the back sheet 13 and the front sheet 12. In another embodiment, the stretchable member 6 is disposed at a position on either the skin-side surface of the front sheet 12 or the non-skin-side surface of the back sheet 13. The stretchable member 6 is bonded to at least one adjacent member or sheet with an adhesive or the like. The material of the extensible member 6 is not particularly limited as long as it is extensible, and may be either extensible in material or shape, or may be extensible by combination with an elastic member. Examples of the material of the extensible member 6 include a film-like extensible member such as a polyurethane film or a polystyrene film, a sheet-like elastic member such as a styrene rubber, an olefin rubber, or a polyurethane rubber, a sheet-like extensible member obtained by compounding the above-mentioned material with a nonwoven fabric, paper, or the like, or an extensible nonwoven fabric. In addition to the stretchable sheet, an elastic member such as a rubber band may be used, or a plurality of rubber bands may be arranged at intervals in the longitudinal direction L along the width direction W.

In the present embodiment, the belt diaper 1 includes a plurality of elastic members 8 for leg gathers from the crotch portion 4 to the back portion 3 and the stomach portion 2. The plurality of elastic members 8 are provided between the pair of

side sheets

17, 17 and the cover sheet 5 so as to extend in the longitudinal direction L mainly at both ends in the width direction W of the crotch portion 4. The plurality of elastic members 8 are for expanding and contracting the pair of leg openings, respectively, and are exemplified by rubber bands.

Next, the absorbent body 14 will be described with reference to fig. 1 to 3. Fig. 3 is a diagram showing a configuration example of the absorbent body 14 of the embodiment, fig. 3 (a) is a plan view, and fig. 3 (b) is a cross-sectional view taken along line IIIb-IIIb in fig. 3 (a). The absorbent body 14 is a layer having liquid absorbing performance and liquid retaining performance, and in the present embodiment includes a 1 st absorbent layer 41 on the skin side, a 2 nd absorbent layer 42 on the non-skin side, and an intermediate layer 43 between the 1 st absorbent layer 41 and the 2 nd absorbent layer 42. The absorbent body 14 has a two-layer structure in which the 1 st absorbent layer 41, the intermediate layer 43, and the 2 nd absorbent layer 42 are sequentially stacked in the thickness direction T. In another embodiment, the absorbent body 14 has a single-layer structure in which the 1 st absorbent layer 41 and the 2 nd absorbent layer 42 are integrated in the thickness direction without the intermediate layer 43. In another embodiment, the absorbent body 14 has a multilayer structure of three or more layers in which another intermediate layer and another absorbent layer are further stacked between the 1 st absorbent layer 41 and the 2 nd absorbent layer 42. In another embodiment, the 1 st absorbent layer 41 is on the skin side and the 2 nd absorbent layer 42 is 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 absorbent body 14 can be considered to have the 1 st and 2 nd water

absorbent materials

45 and 47 as absorbent cores and the 1 st and 2

nd base materials

44 and 46 as core claddings. However, the shape thereof is not particularly limited,examples thereof include a rectangle having a short side projecting in an arc shape, a rounded rectangle, an ellipse, and an hourglass shape. The thickness of the absorbent member 14 is, for example, 0.5mm to 20mm, preferably 1mm to 10 mm. The basis weight of the absorbent body 14 can be appropriately adjusted according to the absorption performance required of the pants-type diaper 1, but for example, 60g/m is mentioned²～1600g/m²。

In the present embodiment, the 1 st absorbent layer 41 includes a 1 st base 44 formed of a liquid-permeable sheet and a 1 st absorbent material 45 having a water-absorbent material containing a water-absorbent polymer and disposed on the intermediate layer 43 side of the 1 st base 44. The 1 st absorbent layer 41 can be viewed as having the 1 st absorbent material 45 as the absorbent core, and the 1 st substrate 44 (and intermediate layer 43) as the core cladding. In another embodiment, the core wrap layer may be formed of a core wrap sheet made of, for example, a cotton paper sheet, which is wrapped with the 1 st water absorbent material 45 on the inner side thereof, independently of the 1 st base material 44 (and the intermediate layer 43). The 1 st water absorbent material 45 is fixed to at least one of the 1 st base material 44 and the intermediate layer 43 by an adhesive applied to at least one of the surface of the 1 st base material 44 on the intermediate layer 43 side and the surface of the intermediate layer 43 on the 1 st base material 44 side. The water absorbing material of the 1 st water absorbing material 45 is disposed in the 1 st absorbing layer 41 with a substantially uniform basis weight. However, the weight per unit area of the end portions in the longitudinal direction L and/or the width direction W may be gradually reduced toward the edges. In this case, the end portion is, for example, a region 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. In another embodiment, the water absorbent material of the 1 st water absorbent material 45 is disposed in the 1 st absorbent layer 41 in a predetermined distribution having sites with a greater weight per unit area and sites with a lesser weight per unit area. The 1 st water absorbing material 45 has a substantially rectangular planar shape. The 1 st base material 44 has a substantially rectangular planar shape, and covers the 1 st absorbent material 45 from the skin side in plan view, and the peripheral edge portion of the 1 st base material 44 slightly extends outward from the periphery of the 1 st absorbent material 45. The outer dimension (outer edge) of the 1 st absorbent layer 41 in the planar direction is set to, for example, the outer dimension (outer edge) of the 1 st absorbent material 45 in the planar direction. The outer dimension (outer edge) thereof is measured, for example, at a position half the thickness direction T of the 1 st water absorbent material 45.

In the present embodiment, the 2 nd absorbent layer 42 includes a 2 nd base 46 formed of a sheet having water retentivity and liquid diffusibility, and a 2 nd water-absorbent material 47 having a water-absorbent material containing a water-absorbent polymer and disposed at a position closer to the intermediate layer 43 side than the 2 nd base 46. The 2 nd absorbent layer 42 can be considered to have the 2 nd absorbent material 47 as the absorbent core and the 2 nd substrate 46 (and intermediate layer 43) as the core cladding. In addition, in another embodiment, as the core wrap, a core wrap sheet such as a tissue paper in which the 2 nd water absorbent material 47 is wrapped inside is provided separately from the 2 nd base material 46 (and the intermediate layer 43). The 2 nd water absorbing material 47 is fixed to at least one of the 2 nd base material 46 and the intermediate layer 43 with an adhesive applied to at least one of the surface of the 2 nd base material 46 on the intermediate layer 43 side and the surface of the intermediate layer 43 on the 2 nd base material 46 side. The absorbent material of the 2 nd absorbent material 47 is disposed in the 2 nd absorbent layer 42 with a substantially uniform basis weight except for the pair of channels 48, 48 (described later). However, the weight per unit area of the end portions in the longitudinal direction L and/or the width direction W may be gradually reduced toward the edges. In this case, the end portions are as described above. In another embodiment, the 2 nd absorbent material 47 is disposed in the 2 nd absorbent layer 42 in a predetermined distribution having sites with a greater weight per unit area and sites with a lesser weight per unit area. The 2 nd water absorbing material 47 has a substantially rectangular planar shape one turn larger than the 1 st water absorbing material 45 in the width direction W and the length direction L. The 2 nd base material 46 has a substantially rectangular planar shape, and covers the 2 nd absorbent material 47 from the non-skin side in plan view, and the peripheral edge portion of the 2 nd base material 46 extends slightly outward from the periphery of the 2 nd absorbent material 47. At this time, both end portions in the width direction W of the 2 nd base material 46 cover both side surfaces of the 2 nd water absorbent material 47, and cover skin-side surfaces of both end portions in the width direction W of the 1 st base material 44. That is, on the skin-side surface of the end portion in the width direction W of the 1 st absorbent layer 41, the end portion in the width direction W of the 2 nd base material 46 and the end portion in the width direction W of the 1 st base material 44 are overlapped and joined. The outer dimension (outer edge) of the 2 nd absorbent layer 42 in the plane direction is set to, for example, the outer dimension (outer edge) of the 2 nd absorbent 47 in the plane direction. The outer dimension (outer edge) thereof is measured, for example, at a position half the thickness direction T of the 2 nd water absorbing material 47.

As described above, the both end portions in the width direction W of the 2 nd base 46 cover the side surfaces in the width direction W of the 2 nd water absorbent 47 and the side surfaces in the width direction W of the 1 st base 44, whereby the 2 nd water absorbent 47 is enclosed in the 2 nd absorbent layer 42 in the width direction W and the 1 st water absorbent 45 is enclosed in the 1 st absorbent layer 41 in the width direction W. In another embodiment, both ends of the 1 st base 44 in the width direction W cover both ends of the 2 nd base 46 in the width direction W. In another embodiment, the 1 st base material 44, the intermediate layer 43, and the 2 nd base material 46 are laminated and joined in the thickness direction T at both ends in the width direction W.

In the present embodiment, the 1 st base material 44, the intermediate layer 43, and the 2 nd base material 46 are laminated and joined in the thickness direction T at both ends in the longitudinal direction L of the absorbent body 14. Thus, the 2 nd water absorbent 47 is enclosed in the 2 nd absorbent layer 42 by the 1 st base material 44 and the intermediate layer 43 in the longitudinal direction L, and the 1 st water absorbent 45 is enclosed in the 2 nd absorbent layer 42 by the 2 nd base material 46 and the intermediate layer 43 in the longitudinal direction L. In another embodiment, both ends of the absorbent body 14 in the longitudinal direction L are not covered with the 1 st base material 44 and the 2 nd 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, 43b adjacent to each other on both sides in the width direction W of the non-skin side surface of the upper layer 43 a. The intermediate layer 43 is formed by folding back and overlapping a pair of side portions located on both sides of a central portion in the width direction W toward the non-skin side of the central portion in a sheet member having a substantially rectangular planar shape. At this 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, 43 b. Therefore, both sides of the intermediate layer 43 in the width direction W 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. The portion 43d in the vicinity of the center of the intermediate layer 43 in the width direction W has a single-layer structure of only the upper layer 43a, and has a substantially rectangular shape extending in 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 in the longitudinal direction L on both sides in the width direction W of the portion 43 d. The heat-seal lands 43c are formed by heating and compressing. In another embodiment, the upper layer 43a and the lower layer 43b of the two-layer construction are joined with embossed portions extending along the length direction L on both sides in the width direction W of the portion 43 d. The embossed portion is formed by compression. In another embodiment, the heat-seal land and the embossed land have a shape of a plurality of dots, a plurality of curves, or a pattern. Both end edges in the width direction W of the intermediate layer 43 are sandwiched and joined by both end portions in the width direction W of the 1 st base material 44 and the 2 nd base material 46, and both end edges in the longitudinal direction L of the intermediate layer 43 are sandwiched and joined by both end portions in the longitudinal direction L of the 1 st base material 44 and the 2 nd base material 46. In another embodiment, the both end edges in the longitudinal direction L are not sandwiched between the both end portions in the longitudinal direction L of the 1 st base material 44 and the 2 nd base material 46, and are not joined. By adopting the double-layer structure, the liquid can be stored temporarily, and the time required for the super absorbent polymer to absorb can be easily ensured.

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

channels

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

passages

48, 48 are strip-shaped regions that are located in the 2 nd absorbent layer 42, extend in the longitudinal direction L, and are arranged at predetermined intervals on both sides in the width direction W with respect to the longitudinal center line CL. The channel 48 is formed at least in the center portion in the longitudinal direction L across the widthwise center line CW. In another embodiment, the channel 48 is formed to reach at least one of both end edges in the longitudinal direction L. The pattern of the pair of

passages

48, 48 in plan view is, for example, a pattern formed so that the interval between the two is constant along the longitudinal direction L. In another embodiment, the pattern of the pair of

passages

48, 48 is formed such that the interval between the passages is narrower near the center in the longitudinal direction L and expands toward both outer sides in the longitudinal direction L, for example. Here, the channels 48 are regions where the weight per unit area of the water-absorbent material is smaller than the regions around the channels of the absorbent body 14, and for example, regions where the weight per unit area of the water-absorbent material is smaller than the regions around the channels 48 of the 2 nd absorbent layer 42, including the case where the weight per unit area is zero. The channels 48 are formed in such a manner that the 2 nd base material 46 is recessed toward the intermediate layer 43 side, that is, the 2 nd water absorbing material 47 is recessed toward the intermediate layer 43 side. In another embodiment, the 2 nd water absorbent 47 is formed so as to be recessed toward the 2 nd base 46 side. The pair of

passages

48, 48 overlaps the pair of heat-

seal lands

43c, 43c in the thickness direction T. In another embodiment, at least a part of the passage 48 does not overlap with the heat-seal lands 43c in the thickness direction T. In addition, in another embodiment, the channel 48 does not extend in the longitudinal direction L but extends in the width direction W, or extends not only in the longitudinal direction L but also in the width direction W. In yet another embodiment, the channel 48 is one or more than three. In yet another embodiment, the channel 48 is not formed in the 2 nd absorption layer 42 but formed in the 1 st absorption layer 41, or formed in the 1 st absorption layer 41 in addition to the 2 nd absorption layer 42. In yet another embodiment, the channel 48 is not formed.

As described above, the 1 st and 2 nd water

absorbent materials

45 and 47 contain Super Absorbent Polymers (SAP). The super absorbent polymer is not particularly limited as long as it can absorb and retain water, and examples thereof include granular or fibrous super absorbent polymers. The basis weights of the super absorbent polymers of the 1 st water absorbent material 45 and the 2 nd water absorbent material 47 can be adjusted appropriately according to the absorption performance required for the tape-type diaper 1, but for example, the basis weights are each 10g/m²～500g/m²Preferably 100g/m²～400g/m². The basis weights of the 1 st water-absorbing material 45 and the 2 nd water-absorbing material 47 may be larger in one than in the other, or may be the same. Wherein, the same means that one is in the range of 100% + -30% of the other. The 1 st water absorbent material 45 and the 2 nd water absorbent material 47 may further include hydrophilic fibers such as pulp fibers and water absorbent fibers. The proportion of the super absorbent polymer to the 1 st water absorbent material 45 and the 2 nd water absorbent material 47 is, for example, 80 to 100% by mass, preferably 90 to 100% by mass, and more preferablyIs selected to be 95 to 100 mass percent. Therefore, the 1 st water absorbent material 45 and the 2 nd water absorbent material 47 can be said to contain a super absorbent polymer as a main component, and the absorbent body 14 can be said to be a so-called SAP sheet. The proportion of the super absorbent polymer to the absorbent body 14 (including not only the 1 st and 2 nd water

absorbent materials

45 and 47 but also the adhesive, the 1 st base material 44, the intermediate layer 43, and the 2 nd 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 1 st water absorbent material 45 and the 2 nd water absorbent material 47 are composed of only a super absorbent polymer and do not contain hydrophilic fibers. In another embodiment, the 1 st water absorbent material 45 and the 2 nd water absorbent material 47 contain pulp fibers and/or water absorbent fibers in addition to the super absorbent polymer.

Examples of the super absorbent polymer include starch-based, cellulose-based, and synthetic polymer-based polymeric absorbents. Examples of the starch-based or cellulose-based super absorbent polymer include a starch-acrylic acid (salt) graft copolymer, a saponified product of a starch-acrylonitrile copolymer, and a crosslinked product of sodium carboxymethylcellulose. Examples of the synthetic polymer-based super absorbent polymer include polyacrylate-based, polysulfonate-based, maleic anhydride-based, polyacrylamide-based, polyvinyl alcohol-based, polyethylene oxide-based, polyaspartate-based, polyglutamate-based, polyalphamate-based, starch-based, and cellulose-based polymers. In the present embodiment, a polyacrylate-based (particularly, sodium polyacrylate-based) super absorbent polymer is preferable. In the present embodiment, it is preferable that 90 to 100 mass% of the superabsorbent polymer in the absorbent body 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 and uniform particle size and are therefore easily retained in the adhesive. The particle diameter of the super absorbent polymer particles is measured in accordance with JIS R6002: the screening test method described in 1998 was standard.

The adhesive is not particularly limited as long as it can fix the super absorbent polymerExamples of the adhesive include a hot melt adhesive. The pattern of the adhesive to be applied is not particularly limited, but examples thereof include a continuous or intermittent Ω pattern, a spiral pattern, and a line pattern. The basis weight of the adhesive can be appropriately adjusted so as not to significantly reduce the liquid absorbency of the absorbent body 14, and for example, each layer is 3g/m²～50g/m². Here, each layer means a layer of the adhesive between the 1 st water absorbent material 45 and the 1 st base 44, a layer of the adhesive between the 1 st water absorbent material 45 and the intermediate layer 43, a layer of the adhesive between the 2 nd water absorbent material 47 and the 2 nd base 46, and a layer of the adhesive between the 2 nd water absorbent material 47 and the intermediate layer 43.

The 1 st base material 44 is not particularly limited as long as it is a liquid-permeable sheet. Examples of the 1 st substrate 44 include a liquid-permeable nonwoven fabric, a hydrophilic nonwoven fabric, and a laminated nonwoven fabric thereof, and among them, a nonwoven fabric having high water permeability is preferable. Examples of the nonwoven fabric include a spunbond nonwoven fabric and a through-air nonwoven fabric formed of polyolefin fibers such as Polyethylene (PE) and polypropylene (PP), polyester fibers such as polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT) and polyethylene naphthalate (PEN), and a combination thereof. These fibers are preferably subjected to hydrophilization treatment 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 hydrophilic fibers and the synthetic fibers are combined may be mentioned. In the present embodiment, an air-laid nonwoven fabric having liquid permeability and liquid retention properties, in which pulp fibers are coated with a hydrophilic binder, is used. Further, as the 1 st base material 44, one kind or plural kinds of the above nonwoven fabrics may be laminated in plural. The weight per unit area of the 1 st substrate 44 is, for example, 10g/m²～100g/m²Preferably 20g/m²～80g/m². The thickness of the 1 st substrate 44 is, for example, 0.1mm to 5mm, preferably 0.15mm to 3 mm.

The 2 nd base material 46 is a liquid or a liquid having water retentivityThe sheet for body diffusion is not particularly limited. Examples of the 2 nd base 46 include nonwoven fabrics formed of synthetic fibers such as polyamide fibers, regenerated fibers such as rayon fibers and acetate fibers, natural fibers such as cotton, silk, hemp and pulp (cellulose) fibers, or a combination thereof. Specifically, for example, a spunbonded nonwoven fabric containing nylon and a spunlace nonwoven fabric containing rayon fibers and/or pulp fibers can be cited. The spun lace nonwoven fabric containing rayon fibers and/or pulp fibers may also contain polyolefin fibers and/or polyester fibers. In the present embodiment, a spunlace nonwoven fabric containing rayon fibers and pulp fibers, which has liquid retention and liquid diffusion properties, is used. Further, as the 2 nd base material 46, one kind or plural kinds of the above nonwoven fabrics may be laminated in plural. The weight per unit area of the 2 nd substrate 46 is, for example, 10g/m²～200g/m²Preferably 35g/m²～150g/m². The thickness of the 2 nd substrate 46 is, for example, 0.1mm to 5mm, preferably 0.15mm to 3 mm.

The intermediate layer 43 is not particularly limited as long as it is a liquid-permeable sheet. As the intermediate layer 43, for example, the same sheet as the 1 st substrate 44 can be used. The weight per unit area of the intermediate layer 43 is, for example, 10g/m²～100g/m²Preferably 15g/m²～80g/m². The thickness of the intermediate layer 43 is, for example, 0.1mm to 5mm, preferably 0.15mm to 3 mm.

In the present embodiment, as shown in fig. 3, the absorber 14 includes a back-side region BA, a stomach-side region FA, and a crotch region MA which are arranged in the longitudinal direction L. Here, the back-side area BA is an area of the absorbent body 14 that overlaps with the back-side portion 3 in the thickness direction T. The abdomen-side region FA is a region of the absorbent body 14 that overlaps the abdomen-side portion 2 in the thickness direction T. The crotch region MA is a region located between the back-side region BA and the stomach-side region FA of the absorber 14, i.e., a region overlapping the crotch portion 4 in the thickness direction T. Thus, the absorber 14 is divided into a back-side region BA overlapping the back-side portion 3, a stomach-side region FA overlapping the stomach-side portion 2, and a crotch region MA overlapping the crotch portion 4 along the longitudinal direction L.

In the present embodiment, the absorber 14 includes a high basis weight region 14a, a low basis weight region 14b, and a non-arrangement region 14 c. The high basis weight region 14a is a region in which the basis weight of the super absorbent polymer is high, and is a region in which the 1 st absorbent layer 41 and the 2 nd absorbent layer 42 overlap in the thickness direction T. The boundary between the high area weight region 14a and the low area weight region 14b is, for example, the outer edge of the 1 st absorbent layer 41. The low basis weight region 14b is a region in which the basis weight of the super absorbent polymer is low, and is a region in which the 1 st absorbent layer 41 is not present but only the 2 nd absorbent layer 42 is present in the thickness direction T. The boundary between the low area weight region 14b and the non-arrangement region 14c is, for example, the outer edge of the 2 nd absorption layer. The non-arrangement region 14c is a region not containing the super absorbent polymer, and is a region where the 1 st absorption layer 41 and the 2 nd absorption layer 42 are not present in the thickness direction T. The term "not containing a super absorbent polymer" includes the case where the weight per unit area of the super absorbent polymer is very small although the super absorbent polymer is present. "very small" means that the weight per unit area of the super absorbent polymer is 5% or less of the weight per unit area of the super absorbent polymer in the high weight-per-unit-area region 14 a. The high area weight region 14a, the low area weight region 14b, and the non-arrangement region 14c have substantially rectangular shapes. However, the shape is not particularly limited, and examples thereof include a rectangle having a short side projecting in an arc shape, a rounded rectangle, an ellipse, and an hourglass shape. In addition, the low basis weight region 14b is a region that surrounds the periphery of the high basis weight region 14a (surrounds at least three sides) in a substantially frame shape in the longitudinal direction L and the width direction W in a plan view, and the outer dimension of the low basis weight region 14b is, for example, 5% to 25% larger than the outer dimension of the high basis weight region 14 a. The non-arrangement region 14c is a region surrounding the low basis weight region 14b in a substantially frame shape, and the outer dimension of the non-arrangement region 14c is, for example, 3% to 15% larger than the outer dimension of the low basis weight region 14 b. The weight per unit area of the low area weight region 14b is, for example, 40% to 60% of the weight per unit area of the high area weight region 14a, and the weight per unit area of the non-arrangement region 14c is, for example, 0% to 5% of the weight per unit area of the high area weight region 14 a. In the case where the absorbent body 14 is not provided with the 1 st absorbent layer 41 and the 2 nd absorbent layer 42 but is formed of one layer, and the like, it is difficult to distinguish the two regions, the high basis weight region is a region in which the thickness of the water absorbent material (including the adhesive) is in a range from the maximum value to 50% of the maximum value. The low basis weight region is a region in which the thickness of the water-absorbent material (including the adhesive) is in the range of 50% to 5% of the maximum value, and the non-arrangement region is a region in which the thickness of the water-absorbent material (including the adhesive) is in the range of 5% to 0% of the maximum value. The thickness is an arithmetic average height (Ra: JIS B0601-2001).

Thus, in the absorber 14, the back-side region BA includes a back-side high area-weight region BAa as the high area-weight region 14a, a back-side low area-weight region BAb as the low area-weight region 14b, and a back-side non-arrangement region barc as the non-arrangement region 14 c. In addition, in the absorbent body 14, the ventral region FA includes ventral high basis weight regions FAa as the high basis weight regions 14a and ventral non-disposed regions FAc as the non-disposed regions 14 c. In addition, the crotch region MA has only the high area weight region 14 a. Therefore, the basis weights of the super absorbent polymers in the back-side high basis weight region BAa and the stomach-side high basis weight region FAa are equivalent to the basis weight of the super absorbent polymer in the crotch region MA. "equivalent" means that one is in the range of 0.7 to 1.3 times (100% ± 30%) the other. In another embodiment, the ventral region FA includes a ventral low basis weight region FAb as the low basis weight region 14b in addition to the ventral high basis weight region FAa and the ventral non-disposition region FAc.

Here, the 2 nd absorbent layer 42 includes a protruding portion protruding outward from the end edge of the 1 st absorbent layer 41 at the rear end in the longitudinal direction L in a plan view. The protruding portion includes a back-side low area weight region BAb, and in the present embodiment, the protruding portion is the same as the back-side low area weight region BAb. The 2 nd absorption layer 42 is covered with the intermediate layer 43, and thus the skin side of the protruding portion, i.e., the back side low basis weight area BAb, is covered with the intermediate layer 43 and the 1 st base material 44. In the present embodiment, the 2 nd absorbent layer 42 includes, in a plan view, widthwise protruding portions that protrude to the outside of the end edges of the 1 st absorbent layer 41 at both ends in the widthwise direction W. The skin side of the widthwise protruding portion is covered with the intermediate layer 43 and the 1 st base material 44. In another embodiment, the 2 nd absorbent layer 42 includes another protruding portion protruding outward from the end edge of the 1 st absorbent layer 41 at the front end portion in the longitudinal direction L in a plan view. The other protrusion includes a ventral low basis weight region. In still another embodiment, the skin side of the protruding portion, i.e., the back-side low basis weight region BAb, is covered with either one of the intermediate layer 43 and the 1 st base material 44, but not the other. In another embodiment, the 2 nd absorbent layer 42 does not include a widthwise protruding portion that protrudes to the outside of the end edge of the 1 st absorbent layer 41 at both side end portions in the widthwise direction W in a plan view.

Fig. 4 is a partially enlarged plan view of the back-side-containing portion 3 of the belt-type diaper according to the embodiment. In the present embodiment, the extensible member 6 of the back portion 3 has the low extensible region 31 having low extensibility in the width direction W and the pair of high

extensible regions

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

high stretch regions

32, 32 are adjacent to the low stretch region 31 on both sides in the width direction W. The low stretch region 31 is a region in which the elongation against a predetermined tensile force in the width direction W ((length after elongation-original length)/(original length)) is 1/3 or less, preferably 1/5 or less, and more preferably 1/10 or less of the elongation in the width direction W of the high stretch region 32. The low expansion and contraction region 31 is, for example, the following region: although the elastic member is used, the region is bonded to various sheets, absorbent bodies, and the like in a non-stretched state, and hardly functions as an elastic member (hardly stretches). On the other hand, the high expansion/contraction region 32 is, for example, the following region: this region is an elastic member, and is attached to various sheets, absorbers, and the like in an extended state, and functions as an elastic member. Therefore, the high expansion/contraction region 32 and the low expansion/contraction region 31 are defined by a region that functions as an elastic member and a region that does not function as an elastic member. In addition, the lower stretchability includes the case of no stretchability. Correspondingly, the absorbent main body 10 can be regarded as having a low expansion and contraction region and a pair of high expansion and contraction regions overlapping the low expansion and contraction region 31 and the pair of high expansion and

contraction regions

32 and 32 in the thickness direction T.

In the present embodiment, as shown in the drawing, the pair of engaging

capsules

7, 7 overlaps the back-side low basis weight region BAb, which is a low basis weight region, in the width direction W. In other words, when an imaginary line connecting the rear-side (outer) end edges of the pair of locking

capsules

7, 7 in the longitudinal direction L is taken as a line BL1 and an imaginary line connecting the front-side (inner) end edges is taken as a line BL2, the region sandwiched by the line BL1 and the line BL2 and the back-side low-basis-weight region BAb overlap in the thickness direction T. In this case, the pair of locking

capsules

7, 7 are pulled outward in the width direction W and joined to the joining target capsule 18, whereby the back-side low-basis-area-weight region BAb can be pressed toward the skin side by the covering sheet 5 and the back sheet 13 between the pair of locking

capsules

7, 7. In this case, the belt diaper 1 does not have to have the extensible member 6.

In the present embodiment, as shown in the drawing, the extensible member 6 overlaps the back-side low area weight region BAb, which is a low area weight region, in the thickness direction T in a plan view. In this case, the pair of locking

members

7, 7 can be pulled to both outsides in the width direction W and joined to the joining target member 18, whereby the stretchable member 6 can be pulled to both outsides in the width direction W, and the back surface sheet 13 laminated on the stretchable member 6, and the like can thereby press the back-side low-area-weight region BAb to the skin side. In this case, the pair of locking

capsules

7, 7 may not overlap the rear-side low basis weight region BAb.

In the present embodiment, a portion on the rear side in the longitudinal direction L of the passage 48 overlaps with the low stretch region 31 in the thickness direction T. In addition, in a plan view, the inner end edge K in the width direction W of each of the pair of high

stretchable regions

32, 32 is located between the end edge 14EW facing the high stretchable region 32 in the width direction W of the absorbent body 14 and (the end edge 48E in the width direction W of) the channel 48. Therefore, the central portion in the width direction W of the absorbent body 14 including the portion on the rear side in the longitudinal direction L of the channel 48 is hardly elongated in the width direction W by the low stretch region 31, and both end portions in the width direction W are elongated in the width direction W by the pair of

high stretch regions

32, 32. Therefore, by pulling and joining the pair of locking

capsules

7, 7 to the joining target member 18 in the width direction W, the back-side low-area-weight region BAb can be pressed toward the skin side as described above. In this case, if the high stretch region is disposed over the entire region in the width direction W of the absorbent body 14, wrinkles in the width direction W occur in the absorbent body 14 before wearing, but since the high stretch region is not disposed in the center portion in the width direction W of the absorbent body 14, wrinkles in the width direction W can be suppressed from occurring in the absorbent body 14 before wearing.

Next, a method for producing the absorbent body 14 will be described.

First, the sheet for the 2 nd substrate 46 is moved in the longitudinal direction L, and the hot melt adhesive is applied to the sheet for the 2 nd substrate 46. Next, the super absorbent polymer was scattered from the super absorbent polymer supply device in the longitudinal direction L onto both end portions and the central portion in the width direction W of the sheet for the 2 nd substrate 46 coated with the hot melt adhesive, respectively. At this time, a small amount of the super absorbent polymer is transferred to the region (corresponding to the channel) between the both end portions and the central portion. Next, a sheet for the intermediate layer 43 coated with hot melt adhesive on both sides was laminated on the super absorbent polymer on the sheet for the 2 nd substrate 46. Next, the laminate was moved in the longitudinal direction L while scattering the super absorbent polymer from another super absorbent polymer supply device in the longitudinal direction L onto the central portion in the width direction W of the sheet for the intermediate layer 43 coated with the hot melt adhesive. Next, the sheet for the 1 st substrate 44 coated with the hot melt adhesive was laminated on the super absorbent polymer on the sheet for the intermediate layer 43 so that the hot melt adhesive was located on the super absorbent polymer side. Then, both side portions in the width direction W of the 2 nd base material 46 sheet are folded back to both side portions in the width direction W of the 1 st base material 44 sheet to obtain a laminate. After that, the thickness of the laminate is adjusted by passing the laminate through a pair of press rolls, i.e., pressing, to obtain the absorbent body 14.

Next, a method for manufacturing a tape diaper using the absorbent body 14 will be described.

A liquid-permeable front sheet 12 is bonded to the upper surface (the surface of the 1 st base 44) of the absorbent body 14 produced as described above, and an extensible member 6 and a liquid-impermeable back sheet 13 are bonded to the lower surface (the surface of the 2 nd base 46) of the absorbent body 14, thereby obtaining a laminate. Next, the side sheets 17 with the leakage preventing walls 16 and the engaging members 7 are attached to both sides in the width direction W of the laminate to obtain the absorbent main body 10. Thereafter, the absorbent main body 10 is stuck to the cover sheet 5 (including the elastic member 8 and the member to be joined 18), and the cover sheet 5 and the absorbent main body 10 are joined. Thereby, the belt-type diaper 1 is manufactured.

Fig. 5 is a schematic view illustrating the effect of the belt-type diaper of the embodiment. Fig. 5 (a) and (b) show the prior art, and fig. 6 (b) shows the present embodiment. As a conventional technique, when an absorbent body containing a relatively large amount of superabsorbent polymer is applied to a belt-type diaper, it is considered that an absorbent body 114 in which superabsorbent polymer is substantially uniformly arranged in a flat shape is used as shown in fig. 5 (a). In such a belt-type diaper, as shown in fig. 5 (b), when the super absorbent polymer absorbs liquid (exemplified by urine) and swells after wearing, the rigidity of the absorbent body 114 increases, and the absorbent body has a relatively straight shape in the longitudinal direction. As a result, for example, the following possibilities exist: the tape-shaped diaper is deformed by the longitudinal back-side end of the absorber into a shape in which the back-side portion 103 of the tape-shaped diaper protrudes outward as indicated by an arrow. In this case, the flatness of the back portion 103 is impaired, and the fitting property of the tape-type diaper may be impaired, and liquid may leak from a gap between the back portion 103 and the skin surface.

On the other hand, in the belt-type diaper of the present embodiment, a low-basis-weight region (back-side low-basis-weight region BAb) in which the weight per unit area of the super absorbent polymer is lower than that in the crotch region MA overlaps with the pair of locking

capsules

7, 7 in the width direction W. When such a belt-type diaper is worn on an infant, the pair of locking

members

7, 7 at both ends of the back-side portion 3 are pulled outward in the width direction W to press the back-side portion 3 against the back of the infant, and the pair of locking

members

7, 7 are locked to the abdomen-side portion 2. Thus, when the back portion 3 is pressed against the back of the infant, as shown in fig. 6 (a), the thin, low-stiffness, low-area-weight region at the end of the absorbent body 14 can be pressed against the back of the infant. As a result, as shown in fig. 6 (b), even if the super absorbent polymer swells after wearing, the deformation of the back portion 3 to the shape protruding outward can be suppressed due to the following factors: the thickness of the end portion of the absorbent body 14 before swelling is small; since the superabsorbent polymer in the low area weight region is less, it is difficult to thicken even if swollen; the low area weight region is pressed against the skin surface by the pair of locking

members

7, 7. That is, the back portion 3 can be suppressed from being convex. This can suppress the adhesive property of the tape diaper 1 from being impaired, and can suppress liquid from leaking from the gap formed between the back side portion 3 and the skin surface.

In the present embodiment, as described above, the low basis weight region (the back-side low basis weight region BAb) and the pair of locking

capsules

7 and 7 overlap in the width direction W, and the extensible member 6 overlaps the low basis weight region in a plan view. Therefore, even if the super absorbent polymer swells and the low basis weight region swells after wearing, the low basis weight region is pressed against the skin surface as the stretchable member 6 moves toward the skin side by the contractile force in the width direction W, and thus the deformation of the back portion 3 to the outward side can be further suppressed. This can further suppress the deterioration of the adhesiveness of the tape diaper 1, and can further suppress the leakage of liquid from the gap formed between the back side portion 3 and the skin surface.

In the belt-type diaper of the other embodiment, the low basis weight region (back-side low basis weight region BAb) does not overlap the pair of engaging

members

7, 7 in the width direction W, but the back-side region BA includes the low basis weight region (back-side low basis weight region BAb) overlapping the stretchable member 6 in the thickness direction T. In this case as well, even if the super absorbent polymer swells after wearing, the deformation of the back portion 3 to the shape protruding outward can be suppressed by the following means and the like: the thickness of the low area-unit-weight region (backside low area-weight region BAb) of the absorbent body 14 before swelling is thin; since the superabsorbent polymer in the low area weight region is less, it is difficult to thicken even if swollen; the stretchable member 6 is pushed toward the skin side by the contractile force in the width direction W, and accordingly, the low basis weight region is also pressed against the skin surface. That is, the back side portion can be suppressed from being convex. This can suppress the adhesive property of the tape diaper 1 from being impaired, and can suppress liquid from leaking from the gap formed between the back side portion 3 and the skin surface.

Fig. 6 is a partially enlarged cross-sectional view of the back side portion of the belt-type diaper 1 of the present embodiment. In the present embodiment, the stretchable member 6 is preferably positioned on the non-skin side of the absorbent body 14. Therefore, even if the super absorbent polymer swells after wearing and the low basis weight region (back side low basis weight region BAb; 2 nd absorbent layer 42) of the absorbent body 14 swells, the low basis weight region is pressed from the non-skin side toward the skin side by the stretchable member 6 and is pressed against the skin surface of the wearer as the stretchable member 6 moves toward the skin side, that is, the absorbent body 14 side, by the contractile force in the width direction W, whereby the deformation of the back side portion 3 to the outward side can be further suppressed.

In the present embodiment, in particular, the stretchable member 6 is preferably joined directly to the non-skin-side surface of the absorbent body 14. Therefore, the stretching force of the stretchable member 6 can be directly transmitted to the absorbent body 14. Therefore, even if the super absorbent polymer swells after wearing and the low basis weight region (the back-side low basis weight region BAb; the 2 nd absorbent layer 42) swells, the low basis weight region is pressed by the stretchable member 6 from the non-skin side to the skin side and is more reliably pressed against the skin surface, whereby the deformation of the back-side portion 3 to the shape protruding outward can be more reliably suppressed.

In the present embodiment, as a preferable mode, the low stretchable region 31 overlaps with the low basis weight region (the back-side low basis weight region BAb of the absorbent body 14) in a plan view. Therefore, even if the entire stretchable member 6 is shrunk, the low stretchable region 31 is difficult to shrink, and thus the low basis weight region can be made difficult to shrink. This can prevent the low basis weight region from easily contracting to cause wrinkles before wearing, or prevent the back portion 3 from deforming to protrude outward due to local concentration of liquid absorption at the wrinkles that have occurred. That is, even if the super absorbent polymer swells after wearing and the low basis weight region swells, the deformation of the back portion 3 to the outside can be further suppressed.

In the present embodiment, as shown in fig. 4, in a preferred aspect, the length d2 of the portion of the stretchable member 6 overlapping the absorbent body 14 is shorter than the length d1 of the portion not overlapping the absorbent body 14 in the longitudinal direction L. Therefore, even if the stretchable member 6 is shrunk as a whole, the low basis weight region (the back-side low basis weight region BAb of the absorbent body 14) can be made difficult to shrink. This can prevent the low basis weight region from easily contracting to cause wrinkles before wearing, or prevent the back portion 3 from deforming to protrude outward due to local concentration of liquid absorption at the wrinkles that have occurred. That is, even if the super absorbent polymer swells after wearing and the low basis weight region swells, the deformation of the back portion 3 to the outside can be further suppressed by the stretchable member 6.

Fig. 7 is a partially enlarged cross-sectional view of the back side portion of the belt-type diaper 1 according to another embodiment. In another preferred embodiment, the stretchable member 6 is located closer to the skin than the absorbent body 14, and the low basis weight region (back side low basis weight region BAb; 2 nd absorbent layer 42) is not joined to the stretchable member 6. Therefore, since the extensible member 6 is positioned closer to the skin than the absorbent body 14, even if the super absorbent polymer swells after wearing and the low basis weight region swells, the low basis weight region can be pulled toward the skin surface as the extensible member 6 moves closer to the skin due to the contractile force in the width direction W. This can prevent the back portion 3 from deforming to protrude outward. Further, since the low basis weight region of the absorbent body 14 and the stretchable member 6 are not joined, a bag-like portion can be formed between the low basis weight region and the stretchable member 6. Thus, the liquid reaching the back portion 3 can be received by the bag-like portion while the back portion 3 is brought into close contact with the skin of the wearer by the stretching force of the stretchable member 6.

In the present embodiment, as a preferred aspect, the absorber 14 has a double-layer structure in which the 1 st absorption layer 41 and the 2 nd absorption layer 42 are laminated, and the low basis weight region (back-side low basis weight region BAb) includes a protruding portion that protrudes to the outside of the end edge of the 1 st absorption layer, among the end portions of the 2 nd absorption layer 42 in a plan view. That is, since the low basis weight region is the layer of the 2 nd absorbent layer 42, the thickness of the low basis weight region can be reliably reduced. This can prevent the back portion 3 from deforming to protrude outward.

In the present embodiment, as a preferable mode, the intermediate layer 43 of nonwoven fabric is provided on the skin side of the 2 nd absorbent layer 42, and the skin side surface of the low basis weight region (the back side low basis weight region BAb; the 2 nd absorbent layer 42) is covered with the nonwoven fabric (the intermediate layer 43). Therefore, the superabsorbent polymer in the low basis weight region (the 2 nd absorbent layer 42) can be made more resistant to movement, and thus the thickness of the low basis weight region can be maintained thinner more reliably. When the back portion 3 is in close contact with the skin surface, even if the low basis weight region of the absorbent body 14 is pressed against the skin surface, the skin surface of the low basis weight region is covered with the nonwoven fabric, and therefore, the unevenness due to the super absorbent polymer is not felt, and the uncomfortable feeling during wearing can be hardly felt. This can suppress the deterioration of the adhesiveness.

The belt-type diaper and the absorber thereof of the present invention are not limited to the above-described embodiments, and known techniques can be applied by combining the embodiments without departing from the object and spirit of the present invention.

Claims

1. A tape-type diaper having a longitudinal direction, a width direction and a thickness direction which are orthogonal to each other, comprising: an absorbent body including an absorber having a front side portion located on the front side in the longitudinal direction, a back side portion located on the back side, and a crotch portion located between the front side portion and the back side portion; and a pair of locking members located on both outer sides in the width direction of the back portion,

the absorbent body comprises a superabsorbent polymer,

the absorbent body includes:

a crotch region;

a back-side region adjacent thereto on a back side in the longitudinal direction of the crotch region; and

a stomach-side region adjacent thereto on a front side in the longitudinal direction of the crotch region,

the back region includes a low basis weight region in which the weight per unit area of the super absorbent polymer is lower than the weight per unit area of the super absorbent polymer in the crotch region,

the pair of engaging capsules overlap the low area weight region in the width direction.

2. The tape diaper according to claim 1,

a telescopic member capable of expanding and contracting in the width direction is further provided between the pair of locking members on the back side portion,

the stretchable member overlaps the low area weight region in a plan view.

3. The tape diaper according to claim 2,

the stretchable member is located on the non-skin side of the absorber.

4. The tape diaper according to claim 3,

the stretchable member is directly engaged with a non-skin-side surface of the absorbent body.

5. The tape diaper according to claim 3,

the telescopic member has:

a low stretch region located at a central portion in the width direction, extending from an end edge on a front side in the longitudinal direction to a rear side, and having low stretchability in the width direction; and

a pair of high-stretchability regions adjacent to the low-stretchability region on both sides in the width direction, the high-stretchability region having a high stretchability in the width direction,

the low expansion/contraction region overlaps the low basis weight region in a plan view.

6. The tape diaper according to claim 3,

the length of the portion of the stretchable member that overlaps with the absorbent body is shorter than the length of the portion that does not overlap with the absorbent body in the longitudinal direction.

7. The tape diaper according to claim 2,

the stretchable member is positioned closer to the skin than the absorber,

the low area weight region is not engaged with the telescoping member.

8. The tape type diaper according to claim 1 or 2,

the absorbent body further includes:

1 st absorption layer comprising the superabsorbent polymer; and

a 2 nd absorbent layer located on the non-skin side of the 1 st absorbent layer and comprising the super absorbent polymer,

the 2 nd absorbent layer includes a projecting portion projecting to an outer side than an end edge of the 1 st absorbent layer at a rear end portion in the longitudinal direction in a plan view,

the protrusions comprise the low area weight regions.

9. The tape diaper according to claim 8,

the absorbent body further comprises an intermediate layer formed of a nonwoven fabric and located between the 1 st absorbent layer and the 2 nd absorbent layer,

the skin-side surface of the low area weight region is covered with the intermediate layer.

10. A tape-type diaper having a longitudinal direction, a width direction and a thickness direction which are orthogonal to each other, comprising: an absorbent body including an absorber having a front side portion located on the front side in the longitudinal direction, a back side portion located on the back side, and a crotch portion located between the front side portion and the back side portion; and a pair of locking members located on both outer sides in the width direction of the back portion,

an extensible member extensible in the width direction is further provided between the pair of locking members on the back side portion,

the absorbent body comprises a superabsorbent polymer,

the absorbent body includes:

a crotch region;

the stretchable member overlaps the low area weight region in a plan view.

11. The tape diaper according to claim 10,

the stretchable member is located on the non-skin side of the absorber.

12. The tape diaper according to claim 11,

13. The tape diaper according to claim 11,

the telescopic member has:

14. The tape diaper according to claim 11,

15. The tape diaper according to claim 10,

the stretchable member is positioned closer to the skin than the absorber,

the low area weight region is not engaged with the telescoping member.

16. The tape diaper according to claim 10,

the absorbent body further includes:

1 st absorption layer comprising the superabsorbent polymer; and

the protrusions comprise the low area weight regions.

17. The tape diaper according to claim 16,