JP2020108749A - Underpants-type diaper - Google Patents

Abstract

To provide an underpants-type diaper capable of improving fitting property while securing absorption performance.SOLUTION: An underpants-type diaper comprises a ventral part 2, a back side part 3, and an absorbent body 10 positioned between the ventral part and the back side part and including an absorber 14. The absorber contains a super absorbent polymer, and comprises a back side area BA, a ventral area FA and a crotch area MA aligned along the longitudinal direction. The back side area is overlapped on the back side part in the thickness direction. The ventral area is overlapped on the ventral part in the thickness direction. The crotch area is positioned between the back side area and the ventral area. At least one of the back side area and the ventral area includes a low-basis weight area having a basis weight of a super absorbent polymer, lower than that of the crotch area.SELECTED DRAWING: Figure 1

Description

The present invention relates to a pants-type diaper.

BACKGROUND ART An absorbent article using an absorbent body containing a relatively large amount of a super absorbent polymer (SAP) as an absorbent material is known. 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 an absorbent body containing a relatively large amount of superabsorbent polymer is applied to a pant-type diaper, it is possible to use an absorbent body in which the superabsorbent polymer is arranged substantially uniformly in a plane. In that case, a super absorbent polymer having a predetermined basis weight is arranged in the crotch region of the absorbent body so as not to leak the excreted liquid (example: urine). Correspondingly, the superabsorbent polymer having a predetermined basis weight is also arranged in the region other than the crotch region of the absorbent body, that is, in the abdominal region and the dorsal region.

Here, in the pants-type diaper, the back side region and the abdomen side region of the absorbent body are brought into close contact with the wearer's skin by the back side and the abdomen side of the pants-type diaper. At that time, if the dorsal region and the ventral region have a predetermined basis weight of the superabsorbent polymer equivalent to that of the crotch region, that is, if they have the same thickness, they are too thick and dig into the dorsal and ventral skin surfaces. It will be easier. In that case, the wearer tends to feel an uncomfortable feeling in the absorber at the time of wearing, and thus the fit property may be deteriorated. On the other hand, if the absorbent body is made thin as a whole, at least the absorption performance of the crotch region is likely to deteriorate. In that case, there is a possibility that an event such as liquid leaking from the end in the width direction or the end in the longitudinal direction may occur. As described above, in the pants-type diaper, there is room for improvement in the thickness of the absorbent body made of the superabsorbent polymer in order to secure the absorbing performance while improving the fitting property.

The absorbent core of Patent Document 1 is divided into a plurality of regions in a plan view in order to improve wearing comfort and the like. That is, in this absorbent core, the arrangement of the super absorbent polymer in the plane is changed. However, the arrangement of the superabsorbent polymer in the thickness direction is not particularly changed.

An object of the present invention is to provide a pants-type diaper containing a superabsorbent polymer, which is capable of improving fit while ensuring absorption performance.

The pants-type diaper of the present invention is as follows. (1) Absorption that has a longitudinal direction, a width direction, and a thickness direction that are orthogonal to each other, and is located between a ventral side portion, a back side portion, the abdominal side portion and the back side portion, and includes an absorber A pant-type diaper comprising: a main body, and the absorbent body including a superabsorbent polymer, the backside region, the abdominal region, and the crotch region arranged along the longitudinal direction. , The dorsal region overlaps the dorsal side portion in the thickness direction, the ventral side region overlaps the ventral side part in the thickness direction, the crotch region, the dorsal region and the ventral side A pants-type diaper located between the region and at least one of the back side region and the abdominal side region includes a low basis weight region in which the basis weight of the superabsorbent polymer is lower than that in the crotch region.

In this pants-type diaper, in the absorbent body, the basis weight of the superabsorbent polymer in the crotch region is relatively high, and the basis weight of the absorbent polymer in the low basis weight region of at least one of the back side region and the ventral side region is relatively high. Low Therefore, since a relatively large amount of the super absorbent polymer is arranged in the crotch region where the liquid needs to be absorbed, the absorbent body surely absorbs the liquid (example: urine) without leaking it while ensuring the absorbing performance. be able to. On the other hand, by disposing a small amount of the superabsorbent polymer in at least one low grammage region of the ventral region and the dorsal region where liquid absorption is not required so much, the region can be thinned. Therefore, when the abdominal part or the dorsal part corresponding to the region is brought into close contact with the wearer's skin surface, it is possible to make it difficult for the absorber to bite into the skin surface. This makes it difficult for the wearer to feel uncomfortable with the absorber, and improves the fit. Therefore, in a pants-type diaper containing a super absorbent polymer, it is possible to improve the fit while ensuring the absorption performance.

In the pants-type diaper of the present invention, (2) the back side region is between the back side low basis weight region as the low basis weight region and the crotch region and the back side low basis weight region in the longitudinal direction. The pants-type diaper according to (1) above, wherein the pants-type diaper has a backside high basis weight region having a grammage of the superabsorbent polymer equivalent to that of the crotch region.
In the underpants-type diaper, the back side high basis weight region in which the basis weight of the superabsorbent polymer is relatively high is provided between the crotch region and the back side low basis weight region. Therefore, it is possible to easily supplement a larger amount of liquid in the back side high basis weight region before the liquid reaches the back side low basis weight region. Thereby, it is possible to reduce the liquid that migrates and diffuses into the low back side low basic weight region of the super absorbent polymer, and it is possible to suppress the leakage of the liquid from the back side end portion of the pants-type diaper 1 in the longitudinal direction, The absorption performance can be ensured more reliably.

The pants-type diaper of the present invention is (3) wherein the back side region is adjacent to the back side high basis weight region on the opposite side in the longitudinal direction with the back side low basis weight region interposed therebetween, and the high water absorption is provided. The pants-type diaper according to (2) above, which has a back side non-arrangement region that does not include a conductive polymer.
This pants-type diaper does not contain a superabsorbent polymer in the longitudinal outside of the back side low grammage area (when the grammage is 5% or less of the grammage of the back side high grammage area as well as zero basis weight. Including) dorsal non-arrangement area. That is, by arranging less superabsorbent polymer in the back side non-arrangement area, the back side non-arrangement area can be made thinner, so that the back side part of the position corresponding to the back side non-arrangement area is It is possible to make a close contact, and it is possible to make it difficult for the absorber (the non-backside region thereof) to cut into the skin surface. Further, it is possible to reduce the super absorbent polymer which hardly contributes to the absorption of liquid. As a result, it is possible to further improve the fitting property while ensuring the absorption performance, and it is possible to efficiently use the superabsorbent polymer.

(4) The pants-type diaper of the present invention has (4) in the longitudinal direction, the length of the back-side high basis weight region is a, the length of the back-side low basis weight region is b, and the back-side non-arrangement region is The pants-type diaper according to the above (3), wherein b>c>a, where b is the length of c.
In this pants-type diaper, the back surface high basis weight area, that is, the area (thickest area) having the largest thickness in the longitudinal direction is set to be the shortest, so that the skin surface when the back side is in close contact with the skin surface It is possible to suppress the bite into a narrow range. This makes it more difficult for the wearer to feel discomfort during wearing. In addition, by making the length (b) of the back low basis weight region, that is, the region having an intermediate thickness, the longest, it is possible to more easily capture the liquid more reliably and to suppress the bite into the skin surface. You can As a result, it is possible to further improve the fit while ensuring the absorption performance more reliably.

The underpants-type diaper of the present invention is (5) the ventral side region is a ventral non-arrangement region in which the basis weight of the super absorbent polymer is equivalent to the back non-arrangement region at the front end in the longitudinal direction. The pants-type diaper according to (3) or (4) above, wherein the length of the ventral side non-arrangement region is shorter than the length of the back side non-arrangement region in the longitudinal direction. Good.
In this pants-type diaper, in the longitudinal direction, the basis weight of the superabsorbent polymer in the ventral region is relatively low, and the basis weight of the superabsorbent polymer in the dorsal region is relatively low. It is shorter than the length of the lower dorsal non-placement area. As a result, a large volume of liquid can be secured on the abdominal side where the liquid diffuses more than on the back side. As a result, the absorption performance can be secured and the liquid can be surely absorbed without leaking.

(6) The pant-type diaper of the present invention has (6) the abdominal region does not have the low basis weight region, is adjacent to the crotch region in the longitudinal direction, and the basis weight of the superabsorbent polymer is the crotch region. The pants-type diaper according to any one of (2) to (5) above, which has a ventral high basis weight region equivalent to
In the underpants-type diaper, the abdominal region does not have a low basis weight region in which the basis weight of the superabsorbent polymer is low, but has a ventral side high basis weight region in which the basis weight of the superabsorbent polymer is high. .. As a result, a large volume of liquid can be secured on the abdominal side where the liquid diffuses more than on the back side. Therefore, the absorption performance can be secured and the liquid can be surely absorbed without leaking.

(7) The use amount of the super absorbent polymer in the ventral side high basis weight region is (7) the use amount of the super absorbent polymer in the back side high basis weight region and the back side low basis weight region. The pants-type diaper according to (6) above, which is more than the total amount of the super absorbent polymer in the amount range, may be used.
In this pants-type diaper, the abdominal high basis weight region has a higher basis weight of the superabsorbent polymer than the region of the back side high basis weight region and the back side low basis weight region combined. Therefore, it is possible to secure a large capacity for absorbing the liquid on the abdominal side where the liquid diffuses more than on the back side. Therefore, the absorption performance can be secured and the liquid can be surely absorbed without leaking.

In the pants-type diaper of the present invention, (8) the total length of the back-side high basis weight region and the back-side low basis weight region in the longitudinal direction is greater than the length of the ventral side high basis weight region. The pants-type diaper according to (6) or (7) above may be long.
In this pants-type diaper, the total length of the back high grammage area and the back low grammage area is longer than the length of the abdominal high grammage area. Therefore, it is possible to secure a long region on the back side where the liquid can be supplemented, on the back side where the liquid leaks more easily than the ventral side. Therefore, the absorption performance can be expanded over a wide range to reliably absorb the liquid without leaking.

In the pants-type diaper of the present invention, (9) each of the back side portion and the abdominal side portion is located in a central portion in the width direction, extends outward from an inner edge in the longitudinal direction, and extends in the width direction. A low elasticity region having low elasticity, and a pair of high elasticity regions which are adjacent to both sides in the width direction of the low elasticity region and have high elasticity in the width direction, and the low side of the back side part. The stretchable region overlaps with the back low basis weight region and the back high basis weight region in a plan view, and the low stretch region of the ventral side overlaps with the ventral high basis weight region in a plan view. The pants-type diaper according to any one of (6) to (8) above may be used.
In the present pants-type diaper, the low elastic region on the back side overlaps with the low low basis weight region and the high basic weight region on the back side, and the low elastic region on the abdominal region overlaps with the high basic weight region on the abdomen. As a result, it is possible to prevent the high basis weight area and the low basis weight area from shrinking in the width direction, and thus it is possible to suppress a decrease in absorption performance due to shrinkage of the absorbent body.

In the pants-type diaper of the present invention, (10) each of the back side portion and the abdominal side portion is adjacent to the outside of the pair of high elastic region and the low elastic region in the longitudinal direction and is high in the width direction. Further having another high stretch region showing stretchability, the other high stretch region of the back side portion, the back side low basis weight region in the absorber is overlapped with the region outside the longitudinal direction, The other high-elasticity region of the abdominal part may be the pants-type diaper according to (9), which overlaps a region outside the abdominal high basis weight region of the absorbent body in the longitudinal direction.
In this pants-type diaper, the other high-elasticity region of the back side overlaps with the region outside the back low-basis-weight region of the absorbent body in the longitudinal direction, and the other high-elasticity region of the abdominal region absorbs the absorbent body. In the longitudinal direction outside the ventral high basis weight region. As a result, due to the contraction of the other high-elasticity regions, the portions outside the high/low basis weight regions of the absorbent body in the back side portion and the abdominal side portion are pulled in the width direction more, and the portions are pulled out in the width direction. It can be pressed more to the skin side. Thereby, the absorber can be fitted to the skin surface at both ends in the longitudinal direction.

(11) The pants-type diaper of the present invention is characterized in that (11) the absorber is located on one side of the first absorbent layer containing the superabsorbent polymer and the first absorbent layer in the thickness direction, and has the superabsorbent property. A second absorbent layer containing a polymer is further provided, and the second absorbent layer is at least one end of both ends in the longitudinal direction in a plan view, and is outside the edge of the first absorbent layer. The pants-type diaper according to any one of (1) to (10) above, which includes a protruding portion, and the protruding portion includes the low basis weight region.
In the present pants-type diaper, the absorber has a two-layer structure in which the first absorption layer and the second absorption layer are laminated, and the low basis weight region is one of the end portions of the second absorption 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. Thereby, when the abdominal part or the dorsal part corresponding to the low basis weight region is brought into close contact with the wearer's skin surface, it is possible to make it difficult for the low basis weight part to bite into the skin surface. This makes it difficult for the wearer to feel uncomfortable and improves the fit.

In the pants-type diaper of the present invention, (12) the second absorbent layer is located on the non-skin side of the first absorbent layer, and the absorbent body is between the first absorbent layer and the second absorbent layer. The pants-type diaper according to (11) above, further comprising an intermediate layer formed of a non-woven fabric, and the skin-side surface of the low basis weight region is covered with the intermediate layer.
In the present pants-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, 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 high water absorbency is achieved. Without feeling the irregularities due to the polymer, it is possible to make it difficult to feel discomfort when wearing. As a result, it is possible to suppress deterioration of fit.

The pants-type diaper of the present invention further comprises (13) a print film located between the back side portion and the back side region, wherein the back side region is made of the highly water-absorbent polymer rather than the crotch region. The pants-type diaper according to any one of (1) to (12) above, which includes a low back side low basis weight region.
In the present pants-type diaper, the print film is arranged between the back side region and the back side, which has the back side low basis weight portion and is therefore relatively thin. Therefore, it is possible to reduce the total thickness of the object (back area+print film) that is sandwiched between the back side and the skin surface during mounting. Thus, when the back side portion is in close contact with the skin surface, the thickness of the print film is not felt, and it is possible to make it difficult to feel a sense of discomfort during mounting and to suppress deterioration of fit.

According to the present invention, it is possible to provide a pants-type diaper including a super absorbent polymer, which can improve the fit while ensuring the absorption performance.

It is a top view showing the example of composition of the pants type diaper concerning an embodiment. It is sectional drawing which follows the II-II line of FIG. 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 underpants type diaper which concerns on embodiment. It is the top view which expanded a part of ventral side part of the underpants type diaper which concerns on embodiment.

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

1 and 2 are diagrams showing a configuration example of a pants-type diaper 1 according to an embodiment. FIG. 1 is a plan view showing a state in which the pants-type diaper 1 is developed, and FIG. 2 is a sectional view taken along line II-II in FIG. In the state shown in FIG. 1, the pants-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. In addition, the side in the longitudinal direction L toward the edge (abdominal edge) of the pants-type diaper 1 corresponding to the wearer's abdomen is also referred to as the front side in the longitudinal direction L, and the pants-type diaper corresponding to the wearer's back. The side toward the edge of 1 (edge on the back side) is also referred to as the rear side of the longitudinal direction L. The "plan view" means that the pants-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 a side closer to the wearer's skin surface and a side farther away in the thickness direction T when the pants-type diaper 1 is worn by the wearer. To do. These definitions are commonly used not only for the pants-type diaper 1 but also for the absorber of the pants-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 along the width direction W is 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 pants-type diaper 1 has a ventral side portion (ventral waist belt) 2, a back side portion (dorsal waist belt) 3, a ventral side portion 2 and a back side portion in the longitudinal direction L. 3 and the absorbent main body 10 located between 3 and 3. In the present embodiment, the pants-type diaper 1 further includes a crotch part 4 located between the abdominal part 2 and the back part 3. The abdominal portion 2 is a portion 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 absorbent main body 10 is a portion that comes into contact with the wearer's crotch, and one end portion in the longitudinal direction L is laminated on the abdominal side portion 2, and the other end portion is laminated on the back side portion 3. The crotch portion 4 is a portion that supports the absorbent main body 10 from the non-skin side. Both ends 2a, 2a of the abdominal part 2 in the width direction W and both ends 3a, 3a of the back part 3 in the width direction W overlap in the thickness direction T and are joined along the longitudinal direction L. As a result, the pants-type diaper 1 is formed. In this case, in the pants-type diaper 1, the waist opening through which the wearer's waist passes is defined by the outer end 2e of the abdomen 2 in the longitudinal direction L and the outer end 3e of the back 3 in the longitudinal direction L. Defined. Further, in the pants-type diaper 1, a 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 addition, the abdominal part (abdominal waist belt) 2 and the dorsal part (dorsal waist belt) 3 are defined in the range of the longitudinal direction L where both ends 2a, 2a and both ends 3a, 3a are joined. Can be said.

In the present embodiment, in the state shown in FIG. 1, the abdominal side portion 2 and the back side portion 3 each have a rectangular shape that extends substantially in the width direction W and are separated from each other in the longitudinal direction L. The crotch portion 4 is located between the ventral side portion 2 and the back side portion 3, and both side edges in the width direction W are recessed inward in the width direction W. The abdominal part 2, the crotch part 4, and the back part 3 are integrally formed with each other. In another embodiment, the ventral portion 2, the crotch portion 4 and the back portion 3 are formed separately from each other. Further, in another embodiment (not shown), the pants-type diaper 1 includes the abdomen 2 and the back 3 and does not include the crotch 4.

In the present embodiment, the abdominal part 2, the dorsal part 3 and the crotch part 4 are provided with a liquid-impermeable cover sheet (sheet member) 5. The cover sheet 5 includes a cover sheet 5a located on the skin side and a cover sheet 5b located on the non-skin side. The cover sheet 5a and the cover sheet 5b are laminated in the thickness direction T and are joined to each other with an adhesive or the like. Both ends in the longitudinal direction L of the cover sheet 5b are folded back to the skin side so as to cover both ends in the longitudinal direction L of the cover sheet 5a. In that case, the cover sheets 5b at the folded-back positions on the abdominal portion 2 and the back portion 3 form the end portion 2e of the abdominal portion 2 and the end portion 3e of the back portion 3, respectively.

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, the number of cover sheets 5 is one, or three or more (not shown). In yet another embodiment, the cover sheet 5b is not folded back (not shown).

In the present embodiment, the abdomen 2 and the back 3 are provided with a plurality of elastic members 6a and 6b for waist gather and a plurality of elastic members 7a and 7b between the cover sheet 5a and the cover sheet 5b, respectively. .. The plurality of elastic members 6a and 6b are arranged on the outside and the inside of the abdominal portion 2 in the longitudinal direction L, respectively. The plurality of elastic members 6a are arranged along the width direction W in the respective predetermined regions on both sides of the longitudinal centerline CL so as to be spaced from each other in the longitudinal direction L. The predetermined region is a region from the end portion 2a to a portion inside the end edge of the absorbent main body 10 facing the end portion 2a in the width direction W. The plurality of elastic members 6b extend from one end 2a to the other end 2a along the width direction W and are arranged at intervals in the longitudinal direction L. Similarly, the plurality of elastic members 7a and 7b are arranged on the outer side and the inner side of the back side portion 3 in the longitudinal direction L, respectively. The plurality of elastic members 7a are arranged along the width direction W and spaced apart from each other in the longitudinal direction L in the respective predetermined regions on both sides of the longitudinal center line CL. The predetermined region is a region from the end portion 3a to a portion inside the end edge of the absorbent main body 10 facing the end portion 3a in the width direction W. The plurality of elastic members 7b extend from one end 3a to the other end 3a along the width direction W, and are arranged at intervals in the longitudinal direction L. The plurality of elastic members 6a, 6b, 7a, 7b expand and contract the waist opening, and are exemplified by rubber thread. It can be said that the abdominal part (abdominal waist belt) 2 and the dorsal part (dorsal waist belt) 3 are defined in the range of the longitudinal direction L in which the plurality of elastic members 6a, 6b, 7a, 7b are arranged. ..

In the present embodiment, the pants-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 mainly extend along 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 rubber thread.

In the present embodiment, the absorbent main body 10 has a substantially rectangular shape, and is located between the liquid-permeable topsheet 12, the liquid-impermeable backsheet 13, and the topsheet 12 and the backsheet 13. And an absorber 14 that absorbs and retains the liquid. 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 together with an adhesive, and the topsheet 12 and the backsheet 13 are bonded together at their peripheral portions with an adhesive. The adhesive may be a known material for pants-type diapers, for example, a hot melt adhesive. The shape of the absorbent main body 10 is not limited to the above example as long as it is a shape that is long in the longitudinal direction L, and may be, for example, a rectangle with rounded corners, a rectangle with a short side protruding outward, or an hourglass shape. Further, 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.

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, and is adjacent to the fixing regions 15 and 15 in the width direction W on the skin side surface of the absorbent main body 10. 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 of the absorbent main body 10 on the skin side in the width direction W 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 leak preventive 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.

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 absorption layer 42. 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 absorption layer are further laminated between the first absorption layer 41 and the second absorption 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 a core wrap. 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 absorber 14 can be appropriately adjusted depending on the absorption performance required for the pants-type diaper 1, and for example, it can be 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, a core wrap sheet made of, for example, a tissue, which has the first water absorbing material 45 wrapped therein, is provided separately from the first base material 44 (and the intermediate layer 43). The first water-absorbing material 45 is formed by the adhesive applied 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 regions 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 absorbing materials of the first water absorbing material 45 are arranged in the first absorbing 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 position half of the first water absorbent material 45 in the thickness direction T.

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 of the second base material 46. And a second water absorbent material 47 having a water absorbent material containing. The second absorbent layer 42 can be regarded as having the second water absorbing 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, a core wrap sheet made of, for example, a tissue, which wraps the second water absorbing material 47 inside of the second base material 46 (and the intermediate layer 43), 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 intermediate layer 43 side surfaces of 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 outward. 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, for example, at a position half of the second water absorbent material 47 in the thickness direction T.

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 this embodiment, the first base material 44, the intermediate layer 43, and the second base material 46 are stacked in the thickness direction T and joined 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 that are adjacent to both sides of the non-skin side surface of the upper layer 43a in the width direction W. 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 having a two-layer structure are joined by a pair of heat seal portions 43c and 43c extending along the longitudinal direction L on both sides of 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 the two-layer structure are joined by the embossed portions extending along the longitudinal direction L on both sides of the width direction W of the portion 43d. The embossed portion is formed by pressing. In still another embodiment, the heat seal portion and the embossed portion have a shape of a plurality of points, a plurality of curves and patterns. 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 joined to each other. In another embodiment, both end edges in the longitudinal direction L are not sandwiched between the both 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 located in the second absorption layer 42, extended in the longitudinal direction L, and arranged at predetermined intervals on both sides in the width direction W across the longitudinal centerline CL. The channel 48 is formed at least in 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, 48 in a plan view is a pattern formed such that the distance between them is constant along the longitudinal direction L. In another embodiment, the pattern of the pair of channels 48, 48 is, for example, a pattern that is narrow near the center in the longitudinal direction L and expands 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, as 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 longitudinal direction L but also in the width direction W. In yet another embodiment, the channel 48 is one or a plurality of three or more. 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 super absorbent 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 pants-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 equivalent. 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 mass%, preferably 90 to 100 mass%, and more preferably 95 to 100 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 this embodiment, the first water-absorbent material 45 and the second water-absorbent material 47 are composed only of superabsorbent 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 a starch-acrylic acid (salt) graft copolymer, a saponified starch-acrylonitrile copolymer, and a crosslinked sodium carboxymethyl cellulose. Examples of the synthetic polymer-based superabsorbent polymer include polyacrylate-based, polysulfonate-based, maleic anhydride-based, polyacrylamide-based, polyvinyl alcohol-based, polyethylene oxide-based, polyaspartate-based, and 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 superabsorbent 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 reduced, and examples thereof include 3 to 50 g/m ² for each layer. 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. An adhesive layer 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 nonwoven fabric and air-through nonwoven fabric. These fibers are preferably hydrophilized by a known method. Alternatively, for example, an air-laid non-woven fabric in which hydrophilic fibers such as pulp fibers and rayon fibers are coated with a hydrophilic binder, and a spunlaced non-woven fabric in which the above-mentioned hydrophilic fibers and the above-mentioned synthetic fibers are combined are included. In the present embodiment, an air-laid non-woven fabric having a liquid permeability and a liquid holding 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 grammage 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 non-woven fabric containing nylon and a spun lace non-woven 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 this embodiment, a spunlace nonwoven fabric containing rayon fibers and pulp fibers, which has a liquid retaining property and a liquid diffusing property, is used. As the second base material 46, one or a plurality of types of non-woven fabrics may be laminated in plural 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 basic weight of the mid 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 absorber 14 includes a back side region BA, a ventral side region FA, and a crotch region MA that 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 side region BA and the abdominal region FA in 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 region 14a, a low basis weight region 14b, and a non-arrangement region 14c. 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 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 a 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 periphery of the high basis weight region 14a in a substantially frame shape (encloses at least three sides) and that of 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 region 14c is a region that surrounds 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 14b. Further, the basis weight of the low basis weight area 14b is, for example, 40 to 60% of the basis weight of the high basis weight area 14a, and the basis weight of the non-arranged area 14c is, for example, 0 of the basis weight of the high basis weight area 14a. .About.5%. When it is difficult to distinguish between the 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 the water absorbing material (including the adhesive). Is the region of the maximum value to 50% of the maximum value. The low basis weight part is a region where the thickness of the water absorbing material (including the adhesive) is in the range of 50% to 5% of the maximum value, and the non-arranged region is the thickness of the water absorbing material (including the 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 In the absorber 14, the abdominal area FA includes an abdominal high basis weight area FAa as the high basic weight 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. In addition, "equal" means that one is in the range of 0.7 to 1.3 times (±30%) of the other. In another embodiment, the abdominal area FA includes an abdominal low basis weight area FAb as the low grammage 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 end 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 area 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 plan view, the width-direction protrusions that protrude outward from the end edges of the first absorption layer 41 at the ends on both sides in the width direction L. 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 absorption layer 42 includes, at a front end in the longitudinal direction L, another protrusion that protrudes outward from the end edge of the first absorption 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-side 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 the widthwise protruding portions that protrude outward from the end edges of the first absorbent layer 41 at the end portions on both sides in the width direction W in a plan view.

In the present embodiment, in the absorbent body 14, in the longitudinal direction L, the length of the back side high basis weight area BAa is da2 (or a), and the length of the back side low basis weight area BAb is db2 (or b). When the length of the back side non-arranged area BAc is dc2 (or c), it is db2>dc2>da2 (or b>c>a). That is, in the back side area BA, the length of the back side low basis weight area BAb is made relatively long, and the basis weight of the superabsorbent polymer is kept low as a whole, while the rear side portion in the longitudinal direction L is high. A water-absorbent polymer is arranged.

In the present embodiment, in the absorbent body 14, in the longitudinal direction L, when the length of the abdominal high basis weight area FAa is da1 and the length of the abdominal non-arranged area FAc is dc1, da1>dc1. That is, in the abdominal region FA, the length of the abdominal high basis weight region FAa is relatively long to increase the basis weight of the superabsorbent polymer on the abdominal side where the excretion amount is large.

In the present embodiment, in the absorber 14, dc2>dc1 in the longitudinal direction L. The length of the ventral non-arrangement area FAc is relatively increased by relatively increasing the length of the back non-arrangement area BAc while suppressing the amount of superabsorbent polymer used in the back area BA with a small amount of excretion. The length of the superabsorbent polymer is shortened to increase the basis weight of the superabsorbent polymer in the ventral region FA where the excretion amount is large.

In addition, in another embodiment, in the absorber 14, in the longitudinal direction L, da2+db2>da1. In this case, the superabsorbent polymer is arranged in the back region BA in the longitudinal direction L up to the rear portion.

In the present embodiment, the usage amount of the super absorbent polymer in the abdominal high basis weight area FAa is equal to the usage amount of the super absorbent polymer in the back side high basis weight area BAa and the super absorbent polymer in the back side low basis weight area BAb. More than the total usage. While the amount of superabsorbent polymer used in the dorsal region BA where the excretion amount is small is kept low, the amount of superabsorbent polymer used in the ventral region FA where the excretion amount is large is increased.

In this embodiment, a print film (not shown) is arranged between the back side portion 3 and the back side area BA of the absorber 14. The print film displays a design or a pattern toward the outside through the cover sheet 5 of the back side portion 3.

FIG. 4 is an enlarged plan view of a part including the back side portion 3 of the pants-type diaper according to the embodiment. In the present embodiment, the back portion 3 has a low back 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 W. The back side low expansion/contraction region 31 is located in the center portion of the back side portion 3 in the width direction W, and extends from the front edge in the longitudinal direction L to the rear side. The pair of back side high expansion/contraction regions 32, 32 are adjacent to both sides of the back side low expansion/contraction region 31 in the width direction W. In the back side low expansion/contraction region 31, the elongation rate ((length after expansion-original length)/(original length)) for a predetermined tensile force in the width direction W is the width of the back side high expansion/contraction region 32. It is a region of 1/3 or less of the elongation in the direction W, preferably 1/5 or less, and more preferably 1/10 or less. For example, the back low expansion/contraction region 31 is a region in which there is no elastic member that expands/contracts in the width direction W, or a region in which an elastic member exists but the elastic member does not function much as an elastic member (does not expand or contract much). .. On the other hand, the back side high expansion/contraction area 32 is an area where the elastic member 7a that expands/contracts in the width direction W exists. Therefore, the back side high expansion/contraction region 32 and the back side low expansion/contraction region 31 are defined by the region where the elastic member 7a that can function as the elastic member exists and the region where the elastic member that can function as the elastic member does not exist. .. The term “low elasticity” includes the case where elasticity does not occur. The elasticity of each elastic area is determined by the elasticity of the elastic member.

In the present embodiment, the rear portion of the channel 48 in the longitudinal direction L overlaps the back low-elasticity region 31 in the thickness direction T. In plan view, the inner edge K1 in the width direction W of each of the pair of back side high-elasticity regions 32, 32 is an edge of the absorber 14 facing the back side high-elasticity region 32 in the width direction W. 14 EW and the channel 48 (the edge 48E in the width direction W thereof). The edge K1 is an inner edge in the width direction W of the elastic member 7a. 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 back side low elastic region 31, and both end portions in the width direction W are formed. Is extended in the width direction W by the pair of back side high elastic regions 32, 32.

In the present embodiment, the inner edge K1 in the width direction W of each of the pair of back side high expansion/contraction regions 32, 32 faces the back side high expansion/contraction region 32 of the absorbent body 14 in the width direction W in a plan view. Is closer to the end edge 48E of the channel 48 in the width direction W than the end edge 14EW. Therefore, both end portions in the width direction W of the absorber 14 including the portion on the rear side in the longitudinal direction L of the channel 48 are extended in the width direction W by the pair of back side high elastic regions 32.

In this embodiment, the back side part 3 further has another back side high expansion/contraction region 34 that exhibits high elasticity in the width direction W. The other back high-elasticity region 34 is adjacent to the rear side of the pair of back high-elasticity regions 32, 32 and the back low-elasticity region 31 in the longitudinal direction L in a plan view. The stretch ratio in the width direction W of the other back-side high stretch regions 34 is substantially the same as the stretch ratio in the width direction W of the back-side high stretch regions 32. The other high expansion/contraction region 34 on the back side is defined as a region where the elastic member 7b exists. Therefore, the rear end portion of the back side portion 3 in the longitudinal direction L is easily pressed against the wearer's back by the other back side high elasticity region 34.

In the present embodiment, in the back side portion 3, the rear end portion 31E of the longitudinal direction L in the back low elasticity region 31 is rearward of the longitudinal direction L rather than the rear end portion of the channel 48 in the longitudinal direction L. Located on the side. Therefore, the rear end portion of the absorbent body 14 in the longitudinal direction L is less likely to be pressed against the wearer's back due to the back side low elastic region 31.

In the present embodiment, the fixed region 15 and the inner end in the width direction W of the back side high elastic region 32 overlap in the thickness direction T. Therefore, the fixed region 15 is easily extended at least outward in the width direction W by the back high-elasticity region 32.

In the present embodiment, the back side low expansion/contraction region 31 of the back side portion 3 overlaps the back side low basis weight region BAb and the back side high basis weight region BAa in a plan view. The belly-side low expansion/contraction area 36 of the belly-side part 2 overlaps with the belly-side high basis weight area FAa in a plan view. Therefore, since it is possible to suppress the high basis weight area and the low basis weight area from contracting in the width direction W, it is possible to suppress the deterioration of the absorption performance due to the contraction of the absorber 14.

In the present embodiment, the other back-side high-elasticity region 34 of the back-side portion 3 overlaps with the region outside the back-side low basis weight region BAb of the absorber 14 in the longitudinal direction L. The other high abdominal expansion/contraction region 39 of the abdominal part 2 overlaps the region outside the abdominal high basis weight region FAa of the absorber 14 in the longitudinal direction L. Therefore, due to the contraction of the other high-elasticity regions 34 and 39, the portions outside the high/low basis weight regions of the absorbent body 14 in the back side part 3 and the abdominal side part 2 in the longitudinal direction L become more widthwise. By pulling, the part can be pressed closer to the skin side.

FIG. 5 is an enlarged plan view of a part including the ventral side portion 2 of the pants-type diaper according to the embodiment. In this embodiment, the ventral side portion 2 is substantially the same as the back side portion 3. That is, the abdominal part 2 has a low abdominal expansion/contraction region 36 having a low elasticity in the width direction W and a pair of abdominal high expansion/contraction regions 37, 37 having a high elasticity in the width direction W. The belly-side low expansion/contraction region 36 is located at the center of the belly-side portion 2 in the width direction W, and extends from the rear edge of the longitudinal direction L to the front side. The pair of belly-side high stretch regions 37, 37 are adjacent to both sides of the belly-side low stretch region 36 in the width direction W. The expansion ratio ((length after expansion-original length)/(original length)) for a predetermined tensile force in the width direction W of the abdominal low expansion/contraction region 36 is the width of the abdominal high expansion/contraction region 37. It is a region of 1/3 or less of the elongation in the direction W, preferably 1/5 or less, and more preferably 1/10 or less. For example, the abdominal low expansion/contraction region 36 is a region in which there is no elastic member that expands/contracts in the width direction W, or a region in which an elastic member exists but the elastic member does not function much as an elastic member (does not expand or contract much). .. On the other hand, the abdominal high expansion/contraction region 37 is a region where the elastic member 6a that expands/contracts in the width direction W exists. Therefore, the region in which the elastic member 6a capable of functioning as an elastic member is present and the region in which the elastic member capable of functioning as an elastic member is not present define the belly-side high stretch region 37 and the belly-side low stretch region 36. The elasticity of each elastic area is determined by the elasticity of the elastic member.

In the present embodiment, a portion of the channel 48 on the front side in the longitudinal direction L overlaps with the ventral low-elasticity region 36 in the thickness direction T. In plan view, the inner edge K2 in the width direction W of each of the pair of ventral high-elasticity regions 37, 37 is an edge of the absorbent body 14 that faces the ventral high-elasticity region 37 in the width direction W. 14 EW and the channel 48 (the edge 48E in the width direction W thereof). The edge K2 is an inner edge in the width direction W of the elastic member 6a. Therefore, of the absorbent body 14 including the portion on the front side in the longitudinal direction L of the channel 48, the central portion in the width direction W is hardly expanded or contracted in the width direction W by the belly-side low expansion/contraction region 36, and both end portions in the width direction W are formed. It is extended in the width direction W by the pair of ventral high elastic regions 37, 37.

In the present embodiment, the distance between the inner edges K2, K2 in the width direction W of the pair of ventral high-elasticity regions 37, 37 in the plan view is the width direction of the pair of backside high-elasticity regions 32, 32. It is equal to the distance between the inner edges K1 and K1 of W. In another embodiment, the distance between the inner edges K2, K2 in the width direction W of the pair of ventral high-elasticity regions 37, 37 in plan view is the width of the pair of backside high-elasticity regions 32, 32. It is shorter than the distance between the inner edges K1 and K1 in the direction W. In that case, both end portions in the width direction W in the portion on the front side in the longitudinal direction L of the absorbent body 14 are extended in the width direction W by the pair of abdominal high stretch regions 37, 37.

In the present embodiment, the abdominal side portion 2 further has another abdominal side high elastic region 39 that exhibits high elasticity in the width direction W. The other abdominal high-elasticity region 39 is adjacent to the front side of the pair of abdominal high-elasticity regions 37, 37 and the abdominal low-elasticity region 36 in the longitudinal direction L. The elastic modulus in the width direction W of the other high-side elastic region 39 is substantially the same as the elastic modulus of the high-elastic region 37 in the width direction W. The other high-side elastic region 39 is defined as a region where the elastic member 6b exists. Therefore, the front end of the abdominal part 2 in the longitudinal direction L is easily pressed against the abdomen of the wearer by the other abdominal high elastic region 39.

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. Next, the super absorbent polymer is supplied from the super absorbent polymer supply device along the longitudinal direction L onto 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 having the both surfaces coated with the hot melt adhesive 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. Then, 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 on the super absorbent polymer side. Then, both side portions of the sheet for the second base material 46 in the width direction W are folded back onto both side portions 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, to obtain the absorber 14.

Next, a method of manufacturing a pants-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 absorbent body 14 manufactured as described above, and the liquid is not adhered to the lower surface of the absorbent body 14 (the surface of the second base material 46). The transparent back sheet 13 is attached to obtain a laminated body. Next, the side sheets 17 with the leak preventive wall 16 are attached to both sides in the width direction W of the laminate to obtain the absorbent main body 10. Then, the absorptive main body 10 is pasted on the cover sheet 5 (including the elastic members 6, 7, and 8), and the both ends 2a, 2a of the abdominal side portion 2 in the width direction W and the width direction W of the back side portion 3 are separated. The both ends 3a, 3a are joined. Thereby, the pants-type diaper 1 is manufactured.

The effect of the pants-type diaper according to the embodiment will be described. In a general pants-type diaper, it is usual to use an absorbent body in which superabsorbent polymers are arranged substantially uniformly in a plane. In that case, a super absorbent polymer having a predetermined basis weight is arranged in the crotch region of the absorbent body so as not to leak the excreted liquid (example: urine). Correspondingly, the superabsorbent polymer having a predetermined basis weight is also arranged in the region other than the crotch region of the absorbent body, that is, in the abdominal region and the dorsal region. The back region and the abdominal region of the absorbent body are closely attached to the wearer's skin by the back region and the abdominal region of the pants-type diaper. At that time, if the dorsal region and the abdominal region have a predetermined basis weight of the super absorbent polymer equivalent to that of the crotch region, that is, if they have the same thickness, the skin on the dorsal and abdominal sides of the wearer is too thick. It becomes easier to cut into the surface. In that case, the wearer tends to feel an uncomfortable feeling in the absorber at the time of wearing, and thus the fit property may be deteriorated. On the other hand, if the absorbent body is made thin as a whole, at least the absorption performance of the crotch region is likely to deteriorate. In that case, there is a risk of leakage from the end in the width direction or the end in the longitudinal direction.

On the other hand, in the pants-type diaper 1 of the present embodiment, in the absorbent body 14, the basis weight of the superabsorbent polymer in the crotch region MA is relatively high, and the low basis weight of at least one of the back side region BA and the abdomen side region FA is low. The basis weight of the water-absorbent polymer in the area is relatively low. Therefore, since a relatively large amount of the super absorbent polymer is arranged in the crotch region MA that needs to absorb the liquid, the absorbent body 14 ensures the absorption performance and surely does not leak the liquid (example: urine). Can be absorbed. On the other hand, by arranging a small amount of the superabsorbent polymer in at least one of the low grammage region of the abdominal region FA and the dorsal region BA where liquid absorption is not required so much, the region can be thinned. Therefore, when the abdominal part 2 or the back part 3 corresponding to the region is brought into close contact with the wearer's skin surface, it is possible to make it difficult for the absorber 14 to bite into the skin surface. This makes it difficult for the wearer to feel uncomfortable with the absorber, and improves the fit. Therefore, in a pants-type diaper containing a super absorbent polymer, it is possible to improve the fit while ensuring the absorption performance.

In the present embodiment, as a preferable mode, the back side high basis weight area BAa in which the basis weight of the superabsorbent polymer is relatively high is provided between the crotch area MA and the back side low basis weight area BAb. Therefore, it is possible to easily supplement a larger amount of liquid in the back-side high basis weight region BAa before the liquid reaches the back-side low basis weight region BAb. As a result, it is possible to reduce the liquid that migrates and diffuses to the low back side low basis weight area BAb of the super absorbent polymer having a low basis weight, and suppresses the leakage of the liquid from the back side end of the pants-type diaper 1 in the longitudinal direction L. Therefore, the absorption performance can be secured more reliably.

In a preferred embodiment of the present embodiment, the super absorbent polymer is not included outside the back low basis weight area BAb in the longitudinal direction L (not only zero basis weight but also the back side high basis weight area BAa of 5). % (Including the case of not more than %) has a back side non-arrangement area BAc. That is, the back non-arrangement area BAc can be made thin by arranging less superabsorbent polymer in the back non-arrangement area BAc. Therefore, the back side part 3 at the position corresponding to the back non-arrangement area BAc is worn by the wearer. It can be more closely attached to the skin surface, and it is possible to make it difficult for the absorber (the back side non-arrangement area BAc thereof) to bite into the skin surface. Further, it is possible to reduce the super absorbent polymer which hardly contributes to the absorption of the liquid. As a result, it is possible to further improve the fitting property while ensuring the absorption performance, and it is possible to efficiently use the superabsorbent polymer.

In this embodiment, as a preferred mode, the relationship between the length a of the back side high basis weight area BAa, the length b of the back side low basis weight area BAb, and the length c of the back side non-arrangement area BAc. Is b>c>a. Therefore, in the longitudinal direction L, by setting the back side high basis weight area BAa, that is, the length (a) of the thickest area to the shortest, the back side portion 3 is brought into contact with the skin surface. The bite of can be suppressed to a narrow range. This makes it more difficult for the wearer to feel discomfort during wearing. In addition, by making the length (b) of the back side low basis weight region BAb, that is, the region having an intermediate thickness, the longest, it is possible to more surely capture the liquid, and also to suppress the bite into the skin surface. be able to. As a result, it is possible to further improve the fit while ensuring the absorption performance more reliably.

In a preferred embodiment of the present embodiment, in the longitudinal direction L, the length of the abdominal non-arrangement area FAc in which the basis weight of the superabsorbent polymer in the abdominal area FA is relatively low is set to be the superabsorbent polymer in the dorsal area BA. Is shorter than the length of the back side non-arranged area BAc having a relatively low basis weight. As a result, a large volume of liquid can be secured on the abdominal side where the liquid diffuses more than on the back side. As a result, the absorption performance can be secured and the liquid can be surely absorbed without leaking.

As a preferred mode in this embodiment, the abdominal region FA does not have a low basis weight region in which the basis weight of the superabsorbent polymer is low, but has a ventral side high basis weight region FAa in which the basis weight of the superabsorbent polymer is high. I am trying. As a result, a large volume of liquid can be secured on the abdominal side where the liquid diffuses more than on the back side. Therefore, the absorption performance can be secured and the liquid can be surely absorbed without leaking.

In the present embodiment, as a preferable mode, the abdominal high basis weight area FAa has a larger amount of the super absorbent polymer used than an area in which the back side high basis weight area BAa and the back side low basis weight area BAb are combined. Therefore, it is possible to secure a large capacity for absorbing the liquid on the abdominal side where the liquid diffuses more than on the back side. Therefore, the absorption performance can be secured and the liquid can be surely absorbed without leaking.

In the present embodiment, as a preferred mode, the total length of the back side high basis weight area BAa and the back side low basis weight area BAb is longer than the length of the belly side high basis weight area FAa. Therefore, it is possible to secure a long region on the back side where the liquid can be supplemented, on the back side where the liquid leaks more easily than the abdomen side. Therefore, the absorption performance can be expanded over a wide range to reliably absorb the liquid without leaking.

In the present embodiment, as a preferable mode, the low expansion/contraction area 31 of the back side portion 3 overlaps the back side low basis weight area BAb and the back side high basis weight area BAa, and the low expansion/contraction area 36 of the abdominal side portion 2 is the abdominal side. It overlaps with the high basis weight area FAa. As a result, it is possible to suppress the back-side high basis weight area BAa, the abdomen-side high basis weight area FAa, and the back-side low basis weight area BAb from contracting in the width direction W. It is possible to suppress deterioration of performance.

As a preferred mode in the present embodiment, the other high-elasticity region 34 of the back side portion 3 overlaps with the region outside the back side low basis weight region BAb of the absorber 14 in the longitudinal direction L, and the other side of the abdominal side portion 2 The high-elasticity region 39 of is overlapped with the region outside the abdominal high basis weight region FAa of the absorber 14 in the longitudinal direction L. Thereby, due to the contraction of the other high expansion/contraction regions 34, 39, the outside of the low grammage region BAb and the high grammage region FAa of the absorber 14 in each of the back side part 3 and the abdomen side part 2 in the longitudinal direction L is outside. By pulling the portion in the width direction W, the portion can be pressed toward the skin side. Thereby, the absorber 14 can be fitted to the skin surface at both ends in the longitudinal direction L.

In the present embodiment, as a preferable mode, the absorber 14 has a two-layer structure in which a first absorption layer 41 and a second absorption layer 42 are laminated, and has a low basis weight region (example: back side low basis weight region BAb). Is included in a protruding portion that protrudes outward from the end edge of the first absorption layer 41 among the end portions of the second absorption layer 42 in a plan view. Therefore, the thickness of the low basis weight region can be surely reduced. Thereby, when the abdominal part 2 or the back part 3 corresponding to the low basis weight region is brought into close contact with the wearer's skin surface, it is possible to make it difficult for the low basis weight part to bite into the skin surface. This makes it difficult for the wearer to feel uncomfortable and improves the fit.

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 grammage region (example: back low grammage region BAb) is a non-woven fabric (intermediate). It is covered with a layer 43). Therefore, when the back side part 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 face of the low basis weight region is covered with the non-woven fabric. The unevenness due to the water-absorbent polymer is not felt, and it is possible to make it difficult to feel discomfort during mounting. As a result, it is possible to suppress deterioration of fit.

In the present embodiment, as a preferred mode, the print film is disposed between the back side region and the back side region having the back side low basis weight portion, and thus relatively thin. Therefore, it is possible to reduce the thickness of the entire object (back side region+print film) that is sandwiched between the back side portion and the skin surface during mounting. Accordingly, when the back side portion is in close contact with the skin surface, the thickness of the print film is not felt, and it is possible to make it difficult to feel a sense of discomfort during mounting. As a result, it is possible to suppress deterioration of fit.

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

1 Pants-type diaper 2 Ventral region (ventral waist belt)
3 Dorsal part (dorsal waist belt)
10 Absorbent body 14 Absorber BA Dorsal region FA Ventral region MA Crotch region

Claims (13)

An absorptive main body having a longitudinal direction, a width direction and a thickness direction orthogonal to each other, located between the abdomen side portion, the back side portion, the abdomen side portion and the back side portion, and including an absorber; A pants-type diaper including,
The absorber is
Including super absorbent polymer,
Arranged along the longitudinal direction, a dorsal region, a ventral region, and a crotch region,
The dorsal region overlaps the dorsal part in the thickness direction,
The ventral side region overlaps the ventral side portion in the thickness direction,
The crotch region is located between the dorsal region and the ventral region,
At least one of the back side region and the ventral side region includes a low basis weight region in which the basis weight of the superabsorbent polymer is lower than the crotch region,
Pants type diaper. The dorsal region is
A back side low basis weight area as the low basis weight area,
In the longitudinal direction, located between the crotch region and the back side low basis weight region, the basis weight of the super absorbent polymer is a back side high basis weight region equivalent to the crotch region, and
Has,
The pants-type diaper according to claim 1. The dorsal region is
In the longitudinal direction, adjacent to the opposite side of the back side high basis weight area across the back side low basis weight area, the back side non-arranged area that does not include the super absorbent polymer,
The pants-type diaper according to claim 2. In the longitudinal direction, when the length of the back side high basis weight area is a, the length of the back side low basis weight area is b, and the length of the back side non-arrangement area is c, then b> Where c>a,
The pants-type diaper according to claim 3. The ventral side region, at the front end in the longitudinal direction, the basis weight of the superabsorbent polymer has a ventral side non-arrangement region equivalent to the back side non-arrangement region,
In the longitudinal direction, the length of the ventral side non-arrangement region is shorter than the length of the back side non-arrangement region,
The pants-type diaper according to claim 3 or 4. The ventral region is
Without the low basis weight area,
Adjacent to the crotch region in the longitudinal direction, the basis weight of the superabsorbent polymer has a ventral high basis weight region equivalent to the crotch region,
The pants-type diaper according to any one of claims 2 to 5. The use amount of the super absorbent polymer in the abdominal high basis weight region is the use amount of the super absorbent polymer in the back side high basis weight region and the use of the super absorbent polymer in the back side low basis weight region. More than the sum with the amount,
The pants-type diaper according to claim 6. In the longitudinal direction, the combined length of the back side high basis weight region and the back side low basis weight region is longer than the length of the ventral side high basis weight region,
The pants-type diaper according to claim 6 or 7. Each of the back side and the ventral side,
Located in the center portion in the width direction, extending from the inner edge in the longitudinal direction to the outside, and 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 expansion and contraction area of the back side portion, in plan view, overlaps with the back side low basis weight area and the back side high basis weight area,
The low expansion and contraction region of the ventral side portion, in plan view, overlaps with the ventral side high basis weight region,
The pants-type diaper according to any one of claims 6 to 8. Each of the back side and the ventral side,
Adjacent to the outside of the pair of high-stretch regions and the low-stretch region in the longitudinal direction, further having another high-stretch region exhibiting high stretchability in the width direction,
The other high expansion and contraction area of the back side portion overlaps with an area outside the back side low basis weight area in the absorber in the longitudinal direction,
The other high-elasticity region of the abdominal portion overlaps with a region outside the abdominal high basis weight region of the absorbent body in the longitudinal direction,
The pants-type diaper according to claim 9. The absorber is
A first absorbent layer containing the superabsorbent polymer,
A second absorbent layer located on one side in the thickness direction of the first absorbent layer and containing the superabsorbent polymer;
Further equipped with,
In a plan view, the second absorbent layer includes at least one end portion of both end portions in the longitudinal direction that includes a protruding portion that protrudes outward from an end edge of the first absorbent layer,
The protrusion includes the low basis weight region,
The pants-type diaper according to any one of claims 1 to 10. The second absorbent layer is located on the non-skin side of the first absorbent layer,
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 formed of a non-woven fabric,
The skin side surface of the low basis weight area is covered with the intermediate layer,
The pants-type diaper according to claim 11. Further comprising a print film located between the back side and the back side region,
The back side region includes a back side low basis weight region in which the basis weight of the superabsorbent polymer is lower than the crotch region,
The pants-type diaper according to any one of claims 1 to 12.

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