Underpants type wearing article

Abstract

To provide an underpants type wearing article which exhibits both of high fitness and excellent trace generation prevention property to a recess which occurs in a range from a lower side of a hypogastrium of a body to the vicinity of an inguinal region when a wearer is seated or bends forward.SOLUTION: There is provided an underpants type wearing article comprising an absorbent body, an exterior body, an abdominal side part arranged on an abdominal side of the wearer, a crotch part arranged on a crotch side, and a back side part arranged on a back side. The abdominal side part has a region where the exterior body and the absorbent body are joined and fixed, and includes a center narrow width junction region, an upper wide width junction region, and a lower wide width junction region. The abdominal side part has a plurality of regions where extension stress in a waist direction by a waist elastomer is different, in an outside in the lateral side in the waist direction of the lower wide width junction region, a lower side low extension stress region is provided. In an outside in the lateral side in the waist direction of the center narrow width junction region, there is provided a high extension stress region where the extension stress is greater than that of the lower side low extension stress region.SELECTED DRAWING: Figure 2

Description

Technical Field

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[0001] The present invention relates to a pant-type wearing article such as a diaper.

Background Art

[0002] Wearing articles such as diapers have forms such as tape type and pant type. In a pant-type wearing article, the outer bodies on the ventral side and the groin part are fixed at the left and right waist joints at both ends in the waist circumference direction, forming an annular body circumference part. Regarding the body circumference part, a technique of arranging an elastic body in an extended state in the waist circumference direction to improve the fit to the wearer's body circumference is known (for example, Patent Documents 1 and 2).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] For the above-mentioned pant-type wearing articles, high fit is required from the viewpoint of preventing leakage. Due to the structure of the human body, when sitting or bending, a depression can form in the area extending from the lower side of the lower abdomen (below the height of the ilium) to the vicinity of the groin, and it is known that it is difficult for the diaper to fit. In order to fit into this depression, there is a technique of increasing the elongation stress of the portion corresponding to the depression to achieve a fit. However, in such a configuration, the portion with high elongation stress strongly hits the skin, resulting in a problem of skin marks. Therefore, it is difficult to achieve both improved fit and suppression of marks. In view of the above, the present invention relates to providing a pant-type wearable article that can achieve both a high level of fit and excellent mark prevention in the depression that occurs from the lower abdomen to the groin area when the wearer sits or bends over. [Means for solving the problem]

[0005] The present invention relates to a pant-type wearable article having an absorbent body and an outer casing, comprising an abdominal portion positioned on the wearer's abdominal side, a crotch portion positioned on the groin side, and a dorsal portion positioned on the back side, and having dimensions in the waist circumference direction and the body length direction. The outer coverings on the ventral and dorsal sides are joined at both ends in the direction of the waist by a pair of waist joints, and waist openings are located on the upper sides of the ventral and dorsal sides in the direction of the body length. The absorbent body extends along the length direction from the center in the waist direction and is joined and fixed to the outer casing on the ventral and dorsal sides. Multiple waist elastic bodies, which extend along the direction of the waist circumference and are spaced apart along the direction of the body length, are stretchably joined to the outer body in the ventral and dorsal portions. The ventral portion has a region where the outer casing and the absorbent body are joined and fixed, and this region includes a central narrow joining region and an upper wide joining region and a lower wide joining region, which are located above and below the central narrow joining region in the body length direction and are wider in the waist circumference direction than the central narrow joining region. The ventral portion has multiple regions in which the tensile stress in the direction around the waist due to the waist elastic body differs from one another, with lower low tensile stress regions located to the left and right outer sides in the direction around the waist of the lower wide joint region, and high tensile stress regions located to the left and right outer sides in the direction around the waist of the central narrow joint region, having a higher tensile stress than the lower low tensile stress regions. We provide pants-type wearable items. [Effects of the Invention]

[0006] The pants-type garment of the present invention can achieve both a high level of fit and excellent mark prevention in the depression that occurs from the lower abdomen to the groin area when the wearer sits or bends over. [Brief explanation of the drawing]

[0007] [Figure 1] This is a schematic perspective view showing a pant-type diaper as a preferred embodiment of the pant-type wearable article according to the present invention. [Figure 2] Figure 1 is a schematic, partially cut-out unfolded plan view showing a pant-type diaper as viewed from the skin side, after it has been cut at the waist joint, unfolded, and stretched. [Figure 3] Figure 2 shows a cross-sectional view of a pull-up diaper along line III-III. [Figure 4] Figure 3 shows a cross-sectional view of a pull-up diaper along line IV-IV. [Figure 5] This is a schematic cross-sectional view showing the change from the state shown in Figure 4 to the state after the wearer sits down and flexes their leg area, compared to the state before the wearer sits down. [Figure 6] Figure 3 is a cross-sectional view of a pull-up diaper along the line VI-VI. [Figure 7] (A) is a schematic diagram showing an example of a state in which the wearer is seated or otherwise bending their legs, and (B) is a schematic diagram showing the correspondence between the upper wide joint area, the central narrow joint area, and the lower wide joint area of ​​the pant-type diaper shown in Figure 2, as well as the upper low elongation stress area, high elongation stress area, and lower low elongation stress area, to the wearer's body in (A). [Figure 8] (A) is a schematic diagram showing the external shape of the high-basis-weight portion of the absorbent material in relation to the wearer's body when the wearer is seated or in a position with the legs bent, and (B) is a plan view showing the structure of the absorbent material on the ventral side. [Figure 9] This is a cross-sectional view showing a specific example in which a thread-like or string-like elastic material and an elastic sheet are arranged as elastic materials in the outer casing on the ventral side. [Figure 10]This is a schematic, partially cut-out unfolded plan view illustrating the preferred shape of the back portion of a pull-up diaper, as seen from the skin side after the pull-up diaper has been cut at the waist joint, unfolded, and stretched. [Modes for carrying out the invention]

[0008] A preferred embodiment of the pants-type wearable article of the present invention will be described below with reference to the drawings. In this specification, the side that comes into contact with the wearer's skin is referred to as the skin side or inner side, and the opposite side is referred to as the non-skin side or outer side. These terms are also used to indicate the relative positional relationship in the component structure of an absorbent article, even for components that do not have a surface that comes into contact with the wearer's skin. Furthermore, the direction located in front of the wearer when worn is referred to as the front or front side, and the direction located behind is referred to as the rear or rear side. The direction normal to the surface or back surface of the worn article, i.e., the direction in which the components are stacked, is referred to as the thickness direction.

[0009] As shown in Figure 1, the pant-type diaper 10 of this embodiment (hereinafter also referred to as diaper 10) comprises an abdominal portion 10F located on the wearer's abdominal side, a crotch portion 10C located on the groin side, and a back portion 10R located on the back side, and has a waist circumference direction X and a body length direction Y. Furthermore, the diaper 10 comprises a waist opening 12 located above the abdominal portion 10F and the back portion 10R in the body length direction Y, and a pair of leg openings 13, 13 located on the left and right sides of the crotch portion 10C.

[0010] Diaper 10 has an absorbent body 1 and an exterior body 2 as constituent members. The exterior body 2 has portions 21 and 22 arranged on the ventral side portion 10F and the dorsal side portion 10R. The exterior bodies 21 and 22 on the ventral side portion 10F and the dorsal side portion 10R are joined at a pair of waist joints 11, 11 at the ends in the waist circumferential direction X. In other words, the portions of the exterior body 2 sandwiched between the pair of left and right waist joints 11, 11 become the exterior bodies 21 and 22 on the ventral side portion 10F and the dorsal side portion 10R described above. The joining at the waist joint 11 can be performed by various methods used for this type of article. For example, joining by pressure consolidation such as fusion bonding (e.g., heat sealing, ultrasonic sealing, laser melting), pressure bonding (e.g., embossing), etc. can be mentioned.

[0011] In the diaper 10 of the present embodiment, the exterior body 2 is divided into a ventral exterior body 21 and a dorsal exterior body 22 that form the outer surface main bodies of the ventral side portion 10F and the dorsal side portion 10R, respectively. Note that the exterior body 2 is not limited to this divided form and can be in a form that can be normally obtained in this type of article. For example, the exterior body 2 may extend over the crotch portion 10F, the crotch portion 10C, and the dorsal side portion 10R and have a shape that is recessed inward in the width direction at the crotch portion 10C. Hereinafter, the exterior bodies 21 and 22 on the ventral side portion 10F and the dorsal side portion 10R of the diaper 10 will be described as the ventral exterior body 21 and the dorsal exterior body 22 in the above-described divided form.

[0012] In the diaper 10 of the present embodiment, an annular body circumferential portion 10D composed of the ventral exterior body 21 and the dorsal exterior body 22 is formed by the joining at the waist joint 11. The absorbent body 1 extending from the body circumferential portion 10D forms the crotch portion 10C. Further, a crotch side extension 8 extending from the dorsal exterior body 22 is arranged on the crotch portion 10C side rather than the position of the waist joint 11. The crotch side extension 8 covers a part of the non-skin side of the absorbent body 1 at the crotch portion 10C and forms a part of the outer surface main body on the buttocks side of the crotch portion 10C.

[0013] Figure 2 shows the diaper 10 in its unfolded state after being cut at the waist joints 11, 11. Here, the unfolded state refers to the state in which each part is stretched out and the pant-type absorbent item is spread out in a flat shape. In the unfolded state, the waist circumference direction X and the body length direction Y mentioned above are also called the width direction X and the longitudinal direction Y. In the unfolded state of the diaper 10, the ventral outer casing 21 and the dorsal outer casing 22 have a horizontally elongated shape in the waist direction X. The absorbent body 1 has a vertically elongated shape, extending along the body length direction Y from the center in the waist direction X, and is positioned toward the ventral portion 10F, the crotch area 10C, and the dorsal portion 10R of the diaper 10. The absorbent body 1 is joined and fixed to the skin-facing sides of the ventral outer casing 21 and the dorsal outer casing 22. Furthermore, the skin-facing end of the absorbent body 1 in the longitudinal direction Y is covered by the folded portion 23 of the ventral outer casing 21 and the dorsal outer casing 22, which are positioned on the non-skin-facing side, and is joined and fixed by the folded joint portion 231. These joining and fixing can be done by various means commonly used in this type of article. For example, joining and fixing can be done by applying various adhesives such as hot melt type adhesives (the same applies to the joining and fixing shown below).

[0014] As shown in FIG. 2, the absorbent body 1 has a liquid-permeable surface sheet 14 on the skin side, a liquid-impermeable back sheet 15 on the non-skin side, and a liquid-retaining absorber 16 disposed between the surface sheet 14 and the back sheet 15. Further, the absorbent body 1 has leg gather elastic bodies 18 on both sides in the body length direction Y. More specifically, a pair of side sheets 17 are provided on both sides in the longitudinal direction Y of the absorbent body 1, and the leg gather elastic bodies 18 are sandwiched and arranged at the folded portions of the side sheets 17. The leg gather elastic bodies 18 are joined in an extendable and contractible manner along the longitudinal direction Y. Thereby, leg gathers are formed around the leg openings 13. The leg gather elastic bodies 18 extend to the ventral part 10F and the dorsal part 10R together with the side sheets 17. In the ventral part 10F and the dorsal part 10R, joining and fixing parts 181 with other constituent members in the absorbent body 1 are arranged at both ends in the body length direction Y of the leg gather elastic bodies 18, and both ends are used as the base points of expansion and contraction. Also, the absorbent body 1 is joined and fixed between the constituent members and integrated.

[0015] Next, the ventral part 10F and the ventral outer body 21 will be described. The ventral outer body 21 forming the outer surface body of the ventral part 10F has an outer layer sheet 61 and an inner layer sheet 62, and has a laminated structure in which a waist elastic body (hereinafter, also simply referred to as an elastic body) 7 is disposed between these sheets. The waist elastic bodies 7 extend along the waist circumference direction X, a plurality of them are arranged at intervals along the body length direction Y, and are joined in an extendable and contractible manner in an extended state. More specifically, the elastic bodies 7 arranged on the ventral outer body 21 extend in the waist circumference direction X while their both ends are joined and fixed to the left and right waist joining parts 11, 11, and are sandwiched and joined and fixed between the outer layer sheet 61 and the inner layer sheet 62, or between the folded inner layer sheets 62. In the region where the ventral outer body 21 and the absorbent body 1 overlap, the elastic bodies 7 are partially cut in the laminated portion of the ventral outer body 21 and the absorber 16. The ends of each of the cut elastic bodies 7 are joined at the ventral outer body 21 at a position overlapping the absorbent body 1, and are made extendable and contractible between the other ends joined to the waist joining part 11. The joint and fixing position of the elastic body 7 on the inner side in the waist circumference direction X (the position overlapping with the absorbent body 1) is not particularly limited, but it is preferable to make it different according to the upper wide joint region 51, the central narrow joint region 52, and the lower wide joint region 53 described later. For example, it is preferable that the joint and fixing position of the elastic body 7 on the inner side in the waist circumference direction X is a position that overlaps with the upper wide joint region 51 and the lower wide joint region 53, respectively, and is a position on the left and right outer sides of the central narrow joint region 52 in the waist circumference direction X. The arrangement configuration of the elastic body 7 in the ventral outer casing 21 is similar to that of the dorsal outer casing 22. The elastic body 7 and the absorbent body 16 do not need to overlap in the waist circumference direction X, but it is desirable that they partially overlap. When the elastic body 7 contracts, the ends of the absorbent body 16 partially contract, causing the absorbent body 16 to conform to the curvature of the body. The overlap width between the elastic body 7 and the absorbent body 16 is preferably 10% to 50% of the width of the absorbent body 16 in the waist circumference direction X on both the left and right sides, and more preferably 20% to 40%.

[0016] The ventral outer casing 21 has a region 5 to which the ventral outer casing 21 and the absorbent body 1 are joined and fixed. In the thickness direction, this region 5 is the part in which the inner layer sheet 62 of the ventral outer casing 21 and the back surface sheet 15 of the absorbent body 1 are joined and fixed, and the ventral outer casing 21 and the absorbent body 1 are integrated.

[0017] Region 5 is a part of region 10G where the ventral outer casing 21 and the absorbent body 1 overlap in a plan view of the ventral outer casing 21, and includes three regions with different lengths in the waist circumference direction X. Specifically, region 5 includes a central narrow joint region 52, and an upper wide joint region 51 and a lower wide joint region 53, which are located above and below the central narrow joint region 52 in the body length direction Y, and have a wider width in the waist circumference direction X than the central narrow joint region 52. These joint regions are adjacent to each other and can be distinguished based on the difference in width in the waist circumference direction X.

[0018] Region 10G may have, in addition to region 5, a ventral non-jointed region 41 in which the ventral outer casing 21 and the absorbable body 1 are not joined or fixed. Preferably, the ventral non-jointed region 41 is located to the left and right outward in the waist direction X of the ventral central narrow jointed region 52.

[0019] In the diaper 10, the area 10G where the ventral outer casing 21 and the absorbent body 1 overlap corresponds to the area in the body length direction Y that covers from around the wearer's navel to above the excretion point (groin). Within this area, the upper wide joining area 51 is positioned opposite to the wearer's navel. The central narrow joining area 52 is positioned opposite to the area (delta-shaped area) that extends from the lower side of the wearer's lower abdomen (below the level of the ilium) to the part where the inguinal region extends. The lower wide joining area 53 is positioned opposite to the area between the left and right thighs below the wearer's inguinal region.

[0020] The length H2 in the height direction Y of the central narrow joint region 52 is longer than the lengths H1 and H3 in the height direction Y of the upper wide joint region 51 and the lower wide joint region 53, respectively. In the above relationship, the ratio (H2 / (H1+H3)) of the length H2 in the height direction Y of the central narrow joint region 52 to the sum of the lengths H1 and H3 in the height direction Y of the upper wide joint region 51 and the lower wide joint region 53 is preferably 0.6 or more, more preferably 0.8 or more, and even more preferably 1 or more, from the viewpoint of the body structure (positional relationship of the navel, ilium, and inguinal region). Furthermore, the ratio (H2 / (H1+H3)) is preferably 3 or less, more preferably 2.5 or less, and even more preferably 2 or less, from the viewpoint of the ease of bending of the absorber 16.

[0021] The upper wide joining region 51 is preferably in the range of 0 to 30%, and more preferably in the range of 5 to 20%, of the region 10G (length H4 in the body length direction) where the ventral outer casing 21 and the absorbent main body 1 overlap, with the waist end in the body length direction Y being 0% and the crotch end being 100%. The central wide joint region 52 is preferably in the range of 20-90% and more preferably in the range of 30-75% in the region 10G where the ventral outer casing 21 and the absorbent main body 1 overlap, with the waist end in the length direction Y being 0% and the crotch end being 100%. The lower wide joining region 53 is preferably in the range of 70-100% and more preferably in the range of 75-95% in the region 10G where the ventral outer casing 21 and the absorbent main body 1 overlap, with the waist end in the length direction Y being 0% and the crotch end being 100%.

[0022] The width W2 of the central narrow joint region 52 in the waist direction X is smaller than the widths W1 and W3 of the upper wide joint region 51 and the lower wide joint region 53. As a result, the area of ​​the central narrow joint region 52 that is outward in the waist direction X becomes a bent portion toward the skin surface. The upper wide joint region 51 and the lower wide joint region 53 suppress deformation at the position that sandwiches the bent portion and firmly contact the bulge of the wearer's skin surface as the base of the bend. For example, when a wearer (e.g., an infant) sits or bends down and a depression is created in the area from the lower abdomen (below the height of the ilium) to the base of the leg (hip joint) and the groin, the upper wide joint region 51 and the lower wide joint region 53 firmly contact the skin surface at the position where the bulge of the skin surface remains, and the area of ​​the central narrow joint region 52 that is outward in the width direction bends and fits into the depression. This effect is further enhanced when combined with the configurations related to each extensional stress region, which will be discussed later.

[0023] From the viewpoint of the above, the width W2 of the central narrow bonding region 52 is preferably 90% or less of the width W1 of the upper wide bonding region 51 and the width W3 of the lower wide bonding region 53, more preferably 60% or less, and even more preferably 50% or less. Furthermore, from the viewpoint of ensuring reliable adhesion between the ventral outer casing 21 and the absorbable body 1, the width W2 is preferably 10% or more of the width W1 and the width W3, more preferably 15% or more, and even more preferably 20% or more.

[0024] The widths W1 and W3 of the upper wide joint region 51 and the lower wide joint region 53 in the waist direction X may be the same or different. From the viewpoint of causing more bending of the absorber 16, it is preferable that they be the same. The widths W1 and W3 of the upper wide joining region 51 and the lower wide joining region 53 in the waist circumference direction X may be the same as, shorter than, or longer than the width of the absorbent body 1 in the waist circumference direction X. From the viewpoint of ease of widening the waist opening, it is preferable that W1 and W3 be shorter than the width of the absorbent body 1 in the waist circumference direction X.

[0025] The central narrow joint region 52 is preferably located in the central part of the waist circumference X direction of the ventral outer casing 21. The width W2 of the central narrow joint region 52 in the waist direction X is preferably 30% or less, more preferably 25% or less, and even more preferably 20% or less, of the width W4 of the ventral outer casing 21 in the waist direction X, from the viewpoint of forming a bent portion outward in the waist direction X of the central narrow joint region 52 as described above. Furthermore, the width W2 is preferably 10% or more, and more preferably 15% or more, from the viewpoint of suppressing the bending of the absorbent material 16 around the lower navel where bending of the wearer's body is unlikely, and from the viewpoint of reliably bonding the ventral outer casing 21 and the absorbent body 1. With this configuration, the area outward in the width direction of the central narrow joint region 52 can sufficiently correspond to and bend to the length of the depression (mainly along the groin) that occurs from the hip joint to the central front side of the body when the wearer sits down, etc.

[0026] The range of each joining area (dimensions in the waist direction X and body length direction Y) can be measured as follows. First, the absorbent pants to be measured are cut at the waist joint 11 and unfolded, and stretched sufficiently without tearing. Printing toner is applied to the non-skin side of the pants and adhered to the adhesive applied to the pants. After removing the unadhered toner, the outline of the joint raised by the toner is read with a scanner and the dimensions in the waist circumference direction X and body length direction Y are calculated using area calculation software. For example, Media Cybernetics' Image-pro 10 can be used as area calculation software.

[0027] In addition, the ventral outer casing 21 has multiple regions in which the tensile stress in the direction X around the waist due to the waist elastic body 7 differs from one another. Specifically, a pair of lower low tensile stress regions 93 are arranged to the left and right outward in the direction X around the waist of the lower wide joint region 53, and a pair of high tensile stress regions 92, which have higher tensile stress than the lower low tensile stress regions 93, are arranged to the left and right outward in the direction X around the waist of the central narrow joint region 52. Furthermore, a pair of upper low tensile stress regions 91 are arranged to the left and right outward in the direction X around the waist of the upper wide joint region 51. The tensile stress refers to the contractile force in the above region against an external force attempting to stretch it. The magnitude of the tensile stress indicates the relative magnitudes of the contractile forces in each region of the ventral outer casing 21, which includes the elastic body 7. The lower low tensile stress region 93 has less tensile stress and therefore less contractile force than the high tensile stress region 92. In other words, the high tensile stress region 92 has more tensile stress and therefore more contractile force than the lower low tensile stress region 93. Furthermore, the high tensile stress region 92 has more tensile stress and therefore more contractile force than the upper low tensile stress region 91. Thus, according to the present invention, the tensile stress can be varied in the height direction Y according to the circumference of the wearer's body.

[0028] The magnitude of the tensile stress in each of these tensile stress regions can be set by various methods. For example, in this embodiment, it is set by the extension length of the elastic body 7 in the waist direction X arranged in each tensile stress region 91 to 93, and the joining length in the waist direction X between the ventral outer casing 21 and the absorbent body 1 in each joining and fixing region 51 to 53 adjacent to each tensile stress region 91 to 93 in the waist direction X. It can also be set as appropriate by the elongation rate, thickness, number, material, etc. of the elastic body 7, and the bonding length of the adhesive between the elastic body 7 and the outer layer sheet 61 and inner layer sheet 62. The tensile stress by the elastic body 7 may be set by one type, or by combining multiple types. Hereinafter, when distinguishing between the upper low-extension stress region 91, the high-extension stress region 92, and the lower low-extension stress region 93, the West elastic body 7 will be referred to as elastic body 71, elastic body 72, and elastic body 73, respectively.

[0029] The lower low-extension stress region 93 consists of a laminated structure of the outer sheet 61, inner sheet 62, and elastic body 73 that constitute the ventral outer casing 21. The lower low-extension stress region 93 is mainly located in the region where the ventral outer casing 21 does not overlap with the absorbent body 1 (the region to the left and right in the waist direction X from the region 10G where the ventral outer casing 21 and the absorbent body 1 overlap). However, as long as the above relationship of magnitude of extension stresses holds, it may overlap with part of the arrangement position of the leg gather elastic body 18 at the end of the absorbent body 1 in the waist direction X. This configuration also applies to the upper low-extension stress region 91. The high-elongation stress region 92 consists of a laminated structure of an outer sheet 61, an inner sheet 62, and an elastic body 73 that constitute the ventral outer casing 21. However, since the high-elongation stress region 92 is located to the left and right outward in the waist direction X of the central narrow joint region 52, it includes a portion of the ventral outer casing 21 that overlaps with the absorbent body 1 without being joined.

[0030] The configuration of the ventral outer casing 21 and the absorbent body 1 is more specifically shown in Figures 3 to 6. In these figures, the surface sheet 14, back sheet 15, absorbent body 16, side sheet 17, and leg gather elastic body 18 of the absorbent body 1 are omitted in order to understand the relationship between the absorbent body 1 and the ventral outer casing 21.

[0031] At the position where the upper wide joint region 51, the central narrow joint region 52, and the lower wide joint region 53 of the ventral portion 10F are aligned in the length direction Y, as shown in Figure 3, the bonding agent layer 51A between the ventral outer casing 21 and the absorbent body 1 located in the upper wide joint region 51, the adhesive layer 52A between the ventral outer casing 21 and the absorbent body 1 located in the central narrow joint region 52, and the bonding agent layer 53A between the ventral outer casing 21 and the absorbent body 1 located in the lower wide joint region 53 are aligned in the length direction. As a result, at this position, the ventral outer casing 21 and the absorbent body 1 are integrated over the length direction Y, and in this integrated state, they are made to fit easily to the contours of the wearer's skin. Moreover, the tensile stress of the high tensile stress region 92 adjacent to the waist circumference direction X is appropriately propagated to the central narrow joint region 52, causing deformation that corresponds to the gentle curves of the wearer's skin, resulting in a soft fit. This also reduces pressure on the lower abdomen of the wearer, making it less likely to leave marks.

[0032] In the position where the high-extension stress region 92 outward in the waist direction X of the central narrow joint region 52, and the upper wide joint region 51 and the lower wide joint region 53 are aligned in the height direction Y, as shown in Figure 4, there is no adhesive layer 52A in the region outward in the waist direction X of the central narrow joint region 52, and the ventral outer casing 21 and the absorbent body 1 are not integrated and can be deformed independently. In addition, a waist elastic body 7 (elastic body 72) is placed on the ventral outer casing 21, forming the high-extension stress region 92. In this position, the upper wide joint region 51 and the lower wide joint region 53 form the bending base (foundation for bending), and by providing a region between the upper and lower bending bases where the absorbent and the outer casing are not bonded, the absorbent body 1 bends toward the skin surface. At this time, the ventral outer casing 21 at this position is stretched in the direction X around the waist, and as a result, the upper wide joining region 51 and the lower wide joining region 53 are pulled towards each other, reducing the distance between them. This reduction in distance causes the flexion of the absorbent body 1 to increase (for example, it changes from the state in Figure 4 to the state in Figure 5). As a result, it can fit deeper into the recess in the area extending from the lower side of the wearer's lower abdomen (below the level of the ilium) to the inguinal region, improving the fit.

[0033] Furthermore, the upper wide joint region 51, the central narrow joint region 52, and the lower wide joint region 53 are positioned outward in the direction X around the waist, where the aforementioned upper low-extension stress region 91, high-extension stress region 92, and lower low-extension stress region 93 are located. At this location, as shown in Figure 6, it mainly consists of the ventral outer casing 21 and does not include the absorbent material 16 that constitutes the absorbent body 1. In addition, the waist elastic body 7 (elastic materials 71, 72, and 73) is positioned on the ventral outer casing 21 to provide elasticity. At this location, the flexion near the base of the wearer's legs is greater than in other areas, and this flexion force acts greatly on the ventral outer casing 21. Due to this flexion action of the body, the entire ventral outer casing 21 gently fits the area (delta-shaped area) extending from the lower side of the wearer's lower abdomen (below the level of the ilium) to the base of the legs (hip joint) and the inguinal region. In addition, in the high-extension stress region 92 at this position, the deformation action of the ventral outer casing 21, which is located in the high-extension stress region 92 between the upper wide joint region 51 and the lower wide joint region 53 shown in Figure 4, is easily transmitted without being constrained by the absorbent body 1. As a result, the high-extension stress region 92 flexes more deeply in response to the size of the depression (mainly along the groin) that occurs from the hip joint towards the center of the body, thereby improving the fit. Furthermore, at this position, the lower low-stretch stress region 93 corresponds to the wearer's leg area. Therefore, by making the stretch stress in the lower low-stretch stress region 93 smaller than that in the high-stretch stress region 92, along with the aforementioned fit, marks are less likely to be left on the leg area below the groin. Furthermore, the upper low-stretch stress region 91 corresponds to the wearer's lower abdomen. Therefore, by making the stretch stress in the upper low-stretch stress region 91 smaller than that in the high-stretch stress region 92, the aforementioned fit is improved, and marks on the lower abdomen are less likely to be left.

[0034] The indentations in the wearer's body mentioned above include, for example, the indentation line K1 on the lower side of the lower abdomen and the indentation line K2 in the groin area, as shown in Figure 7(A). As shown in Figure 7(B), the diaper 10 fits into these body contours by fitting into contour lines K1 and K2 at different depths. Specifically, the upper wide joint region 51 and the lower wide joint region 53 become a bending base that suppresses deformation, and the absorbent body 1 bends relatively significantly toward the body at the position of the high-extension stress region 92 outward in the waist direction X of the central narrow joint region 52 sandwiched between them (see Figure 5). The central narrow joint region 52 itself, although affected by the high-extension stress region 92, has relatively high rigidity due to the joint, so the depth of bending is kept small. Thus, the depth of bending increases as you move outward in the waist direction X of the central narrow joint region 52. This corresponds to the magnitude of the body contours along contour lines K1 and K2. As a result, the diaper 10 fits suitably to the depth of the contour line K1 below the lower abdomen and the contour line K2 in the groin area. Furthermore, this allows the pressure on the body from the diaper 10 to be effectively reduced. In addition, the above-mentioned joining regions 51-53 provide a relatively strong fit to the body in the waist direction and central direction, while the lower low-stretch stress region 93 suppresses marks on the wearer's lower abdomen and legs.

[0035] Thus, the diaper 10 of this embodiment achieves both a high level of fit to the depressions that occur when sitting or bending over, and excellent resistance to leaving marks, thanks to the above configuration.

[0036] The length L3 in the Y direction of the lower low-extension stress region 93 may be the same as or different from the length H3 in the Y direction of the adjacent lower wide bonding region 53. From the viewpoint of ensuring reliable adhesion between the ventral outer casing 21 and the absorbent body 1, and from the viewpoint of the relationship between the length from the lower abdomen to the thigh, it is preferable that the length L3 in the Y direction of the lower low-extension stress region 93 is the same as or longer than the length H3 in the Y direction of the adjacent lower wide bonding region 53. The ratio (L3 / H3) of the length L3 in the Y direction of the lower low-extension stress region 93 to the length H3 in the Y direction of the lower wide bonding region 53 is preferably 1 or more, more preferably 1.2 or more, and even more preferably 1.5 or more, from the viewpoint of the length from the lower abdomen to the thigh. Furthermore, from the viewpoint of ensuring reliable adhesion between the ventral outer casing 21 and the absorbent body 1, the ratio (L3 / H3) is preferably 3 or less, more preferably 2.5 or less, and even more preferably 2 or less. The above also applies to the upper low-extension stress region 91.

[0037] From the viewpoint of making the aforementioned mark-preventing properties more effective, the tensile stress in the lower low-tensile stress region 93 is preferably 95% or less, more preferably 80% or less, and even more preferably 70% or less of the tensile stress in the high-tensile stress region 92. Furthermore, from the viewpoint of preventing the diaper from slipping down, the tensile stress in the lower low-tensile stress region 93 is preferably 5% or more, more preferably 10% or more, and even more preferably 20% or more. The high-elongation stress region 92 is preferably located adjacent to the lower low-elongation stress region 93 above in the height direction Y. The high-elongation stress region 92 is preferably located at a position where it overlaps the central narrow joint region 52 and the upper wide joint region 53 in the height direction Y.

[0038] It is preferable that the ventral outer casing 21 has an upper low-stretch stress region 91 in the waist direction X outward of the upper wide joining region 51. This makes it less likely for the upper wide joining region 51 to leave marks on the skin surface on the lower side of the wearer's lower abdomen. It is preferable that the ratio of the tensile stress in the upper low-tensile stress region 91 to the tensile stress in the high-tensile stress region 92 be the same as that in the lower tensile stress region 91. The tensile stress in the upper low-tensile stress region 91 may or may not be the same as the tensile stress in the lower low-tensile stress region 93. From the viewpoint of minimizing marks from the lower abdomen to the thighs, it is preferable that the tensile stress in the lower low-tensile stress region 93 be smaller than the tensile stress in the upper low-tensile stress region 91. When the tensile stress in the lower low-tensile stress region 93 is made smaller than the tensile stress in the upper low-tensile stress region 91, the tensile stress in the lower low-tensile stress region 93 is preferably 90% or less, more preferably 80% or less, and even more preferably 70% or less of the tensile stress in the upper low-tensile stress region 91. Furthermore, from the viewpoint of preventing the diaper from slipping down, the tensile stress in the lower low-tensile stress region 93 is preferably 30% or more, more preferably 40% or more, and even more preferably 50% or more of the tensile stress in the upper low-tensile stress region 91.

[0039] The tensile stress in these regions can be measured as follows: First, the pants-type absorbent item to be measured is cut at the side seal portion 11, and the position in the body length direction Y where the absorbent body 1 and the ventral outer casing 21 overlap in the ventral portion 10F is identified. At that position, the stress zone regions 91, 92, and 93 of the ventral outer casing 21 are identified, which are demarcated at the point where at least one of the pitches or types (diameter, material) of the various elastic bodies 7 contained in the ventral outer casing 21 changes. The boundary of each region is the edge of the region directly above it or the edge below the lower elastic body 7. If the point of change cannot be identified, each region is identified by dividing it into regions corresponding to the height in the body length direction Y of the upper wide joint region 51, the central narrow joint region 52, and the lower wide joint region 53. The position in the waist circumference direction X of each region is to the end of the elastic body placed in each region. Next, each region is cut out with the elastic body 7 in place. When cutting, the side seal portion 11 and the portion where the absorbent body 1 and the ventral outer casing 21 are bonded (absorbent body bonding portion) at the same height direction Y position as each region are cut out to form a test specimen. For the cut-out test specimen, the side seal portion 11 at one end and the absorber adhesive portion at the other end are chucked, and the stress is measured using an autograph tester at a speed of 300 mm / min when the test specimen is stretched to 1.6 times its natural length. For example, the autograph tester used can be the autograph AG-X (product name, manufactured by SHIMADZU).

[0040] As shown in Figure 2, the ventral outer casing 21 can have a folded portion 23 that is folded back towards the absorbent body at the waist opening. Preferably, the folded portion 23 is joined and fixed to the skin-facing side of the absorbent body 1 by a folded joint portion 231 formed along the waist circumference direction X. It is preferable that this folded joint portion 231 overlaps with the upper wide joint region 51 in at least a portion. By having this folded joint portion 231 overlap with the upper wide joint region 51 in at least a portion, the rigidity of the upper wide joint portion 51 as a bending base is further increased. As a result, the absorbent body 1 located in the high elongation stress region 92 sandwiched between the upper and lower bending bases becomes more flexible. The length in the height direction of the portion where the folded joint portion 231 and the upper wide joint region 51 overlap is preferably 5% or more, more preferably 30% or more, and even more preferably 50% or more, of the length Y in the height direction of the upper wide joint region 51. Preferably, the folded joint portion 231 does not overlap with the central narrow joint region 52, but it can also be configured to partially overlap with the central narrow joint region 52.

[0041] A preferred configuration when a folded portion is included will be explained further. As shown in Figures 2 and 3, the folded portion 23 of the ventral outer casing 21 is joined to the ventral outer casing 21 on the skin-facing side of the absorbent body 1. More specifically, a plurality of waist opening elastic bodies 74 are joined and fixed between the inner layer sheet 62 constituting the folded portion 23 and the inner layer sheet 62 constituting the ventral outer casing 21, so as to be expandable and contractible in an extended state along the waist direction X.

[0042] The absorbent material 16 in the absorbent body 1 can be an absorbent material with a uniform basis weight, or it can be an absorbent material with a different basis weight. Preferably, the absorbent material 16 has a high basis weight section 161 with a different basis weight and a low basis weight section 162 with a lower basis weight, as shown in Figures 2 and 8. From the viewpoint of leakage performance, the basis weight of the absorbent material in the high basis weight section 161 is preferably 1.1 times or more, more preferably 1.5 times or more, and even more preferably 2.0 times or more, the basis weight of the absorbent material in the high basis weight section 161 is preferably 5.0 times or less, more preferably 4.0 times or less, and even more preferably 3.5 times or less low basis weight section 162, from the viewpoint of causing greater bending of the absorbent body 16.

[0043] The high-basis-weight portion 161 and the low-basis-weight portion 162 in the absorber 16 may be formed by varying the thickness of a single layer, or by varying the number of layers. In this embodiment, as shown in Figures 2 and 8, it has a laminated structure of an upper absorbent portion 16A and a lower absorbent portion 16B, where the upper and lower two-layer laminated portion is the high-basis-weight portion 161, and the single-layer portion consisting only of the lower absorbent portion 16B is the low-basis-weight portion 162, which has a lower basis weight than the high-basis-weight portion 161. The same laminated structure for forming the low-basis-weight portion 161 and the high-basis-weight portion 162 can be applied to the back side as well.

[0044] In such absorbent material 16, it is preferable that the high basis weight portion 161 is included in the ventral portion 10F. This makes it possible to ensure greater rigidity as a bending base at the position where the upper wide joint region 51, the central narrow joint region 52, and the lower wide joint region 53 are aligned in the height direction Y. Furthermore, it is preferable that the boundary 163 (see Figure 8) between the high-basis-weight section 161 and the low-basis-weight section 162 partially overlaps with the upper wide joint region 51. This makes the absorbent body 1 more flexible in the same range as the height direction Y of the central narrow joint region 52.

[0045] The position of the high-basis-weight portion 161 within the absorbent body 1 is not particularly limited, but it is preferably positioned so that it extends along the body length direction Y at the center of the width in the waist direction X of the absorbent body 16 and overlaps with the ventral outer casing 21 and the dorsal outer casing 22. It is more preferable that the high-basis-weight portion 161 is positioned so that the width in the waist direction X is wider in the portion where the absorbent body 16 overlaps with the ventral outer casing 21.

[0046] Preferably, in a plan view, the high-basis-weight section 161 has a wide absorbent section 164 located on the ventral section 10F, a narrow absorbent section 165 located in the crotch area 10C, and an inclined absorbent section 166 connecting the wide absorbent section 164 and the narrow absorbent section 165, as shown in Figures 2 and 8. Furthermore, it is preferable that the intersection point 167 of the outer edge of the wide absorbent section 164 in the waist circumference direction X and the outer edge of the inclined absorbent section 166 in the waist circumference direction X (specifically, the point where the outer edge of the wide absorbent section 164 in the waist circumference direction X, which extends linearly along the body length direction Y, connects with the outer edge of the inclined absorbent section 166, and where the curvature or angle changes inward in the waist circumference direction X) is located in a position that overlaps with the lower wide joining region 53 on the ventral section 10F. Because the intersection 167 overlaps with the lower wide joining region 53 in at least part of it, the intersection 167 is more likely to catch on the recess line K2 of the groin area near the base of the wearer's leg. For example, as shown in Figures 8(A) and (B), the intersection 167 in the absorbent material 16, enclosed by the dotted line in Figure 8(B), is more likely to catch on and fit into the recess of the wearer's groin, as shown in Figure 8(A). Starting from this intersection 167, the force of body flexion caused by the wearer sitting or bending causes the absorber 16 located in the lower low-stretch stress region 93 of the ventral outer casing 21 to fold together with the ventral outer casing 21 along the inguinal recess line K2, resulting in a soft and comfortable fit.

[0047] In the ventral outer casing 21, as shown in Figure 2, it is preferable to have an overlapping portion Q between the joining and fixing portion 181 of the leg gather elastic body 18 and the lower wide joining region 53. This overlapping portion Q acts as the starting point for bending. As a result, the leg gather elastic body 18 is effectively pressed against the recessed line of the groin, further improving the fit. From this perspective, in the configuration in which the above-mentioned overlapping portion Q is arranged, it is preferable that the central narrow joining region 52 has ventral non-jointed regions 41 on the left and right outward sides in the waist direction X, where the ventral outer casing 21 and the absorbent main body 1 are not joined, and that the leg gather elastic body 18 extends to the ventral non-jointed regions 41.

[0048] In the ventral outer casing 21, as shown in Figure 2, it is preferable that there is an overlapping region P between the joining and fixing portion 181 of the leg gather elastic body 18, the intersection point 167 of the outer edge in the waist direction X of the wide absorbent portion 164 and the outer edge in the waist direction X of the inclined absorbent portion 166 in the waist direction X of the high basis weight portion 161 of the absorbent body 16, and the lower wide joining region 53. This allows the leg gather elastic body 18 to be effectively pressed against the recessed line of the groin area, improving the fit. Here, the overlapping region P refers to a circular area with a radius of 10 mm centered on the intersection point 167. In this case, the leg gather elastic body 18 included in the overlapping region P may extend to a position that overlaps with the non-skin side of the absorbent body 16, or it may be arranged so as not to overlap with the absorbent body 16.

[0049] In the embodiment in which the above-described overlapping region P is arranged, it is preferable that the central narrow joining region 52 has ventral non-jointed regions 41 on the left and right outward sides in the waist direction X where the ventral outer casing 21 and the absorbent main body 1 are not joined, and that the leg gather elastic body 18 extends to the ventral non-jointed regions 41.

[0050] Furthermore, in the embodiment in which the overlapping portion Q or overlapping region P is arranged, it is preferable that the waist elastic body 73, which is arranged in the lower low-stretch stress region 93, extends beyond the overlapping portion Q or overlapping region P to the inside in the waist circumference direction X, preferably to the lower wide joining region 53. This allows the leg gather elastic body 18, which extends in the body length direction Y, to be fixed from both sides by the contraction force of the waist elastic body 73, which extends in the waist circumference direction X, so that even when the wearer moves, the leg gather elastic body 18 can be firmly pressed against the groin area.

[0051] The waist elastic body 7 is preferably composed of a thread-like or string-like elastic material. In this case, it is more preferable that the waist elastic body 7 is composed of a thread-like or string-like elastic material with the same elongation rate in all of the upper low elongation stress region 91, the high elongation stress region 92, and the lower low elongation stress region 93. According to the present invention, the stress in each elongation stress region can be adjusted by controlling the length of the elastic body 7 according to the length of the waist in the direction X of each elongation stress region.

[0052] In the present invention, by combining the aforementioned bonding regions and tensile stress regions, it is possible to improve the fit of the diaper 10 to the skin even when using an elastic material or sheet with less tensile force (lower elongation rate) than conventional materials as the waist elastic body 7. Conventionally, it has been generally believed that increasing the stretchability of the waist elastic material is necessary to improve the fit to depressions such as the groin area. However, in this case, for example, in elastic materials obtained by laminating nonwoven fabric and elastic fibers and then stretching them, the nonwoven fabric portion is difficult to stretch, so if high stretchability is attempted, the nonwoven fabric may be damaged and the appearance may be spoiled. Also, in elastic materials of the type in which an elastic film is stretched and bonded to a nonwoven fabric, if high stretchability is attempted, large and irregular folds tend to form in the diaper 10, which may spoil the appearance. In contrast, the present invention narrows the bonding width between the ventral outer casing 21 and the absorbent body 1 in the central narrow bonding region 52, thereby making the stretchable regions on the left and right sides of the central narrow bonding region 52 longer compared to conventional designs. Because this stretchable region is relatively long, sufficient tensile stress can be secured even if the elongation rate of the elastic body itself is lower than in conventional designs (high tensile stress region 95). Furthermore, by suppressing the bonding area of ​​the central narrow bonding region 52, the high tensile stress regions 95 on the left and right sides become less affected by the relatively rigid absorbent body 1, and high tensile stress is more likely to occur. At the same time, even if an elastic body with the same elongation rate as the elastic body in the high tensile stress region 95 is used in the stretchable regions on the left and right sides of the upper wide bonding region 51 and the lower wide bonding region 52, the stretchable regions are shorter than the high tensile stress region 95, so it is possible to control the tensile stress to prevent it from becoming excessive (upper low tensile stress region 91 and lower low tensile stress region 93). As a result, the fit to recesses such as the groin area can be improved without compromising the appearance. Furthermore, in the present invention, as described above, lowering the elongation rate of the waist elastic body has the advantage of suppressing shrinkage of the absorbent body 1 in the width direction X. Conventionally, methods have been known to reduce the stress in the expansion material placed in the portion overlapping with the absorbent body 1 by methods such as heat sealing, thereby suppressing shrinkage of the absorbent body 1 in the width direction X. However, even with this conventional method, it is difficult to completely eliminate the above-mentioned stress. Therefore, the more an expansion material with a higher elongation rate is used, the more stress remains, which may cause the absorbent body 1 to shrink in the width direction and affect its absorbency. In contrast, in the present invention, as described above, it is possible to improve the fit without compromising the appearance even if the elongation rate of the waist elastic body itself is reduced. By reducing the elongation rate, it is possible to control the effect of stress on the absorbent body 1 from the waist elastic body in the overlapping portion of the ventral outer casing 21 and the absorbent body 1 (central narrow joint region 52, upper wide joint region 51, and lower wide joint region 53). As a result, the absorbent body 1 (absorbent 16) becomes less likely to shrink in the width direction, and its original absorbency can be exerted more effectively.

[0053] In the ventral portion 10F, the outer casing (ventral outer casing) 21 can also be configured with a thread-like or string-like elastic material and an elastic sheet 75 as the elastic body 7. From the viewpoint of suppressing marks on the groin area, it is preferable to form a portion of the lower low-stress region 93 in which only an elastic material is provided as an elastic body 7. For example, as shown in Figure 9, the outer layer sheet 61 is made into an elastic sheet 75, the number of thread-like or string-like elastic materials placed between the outer layer sheet 61 and the inner layer sheet 62 is reduced in the lower low-extension stress region 93, and a portion of the crotch area 10C of the lower low-extension stress region 93 is made to have the contraction force of only the elastic sheet 75. Examples of the stretchable sheet 75 include sheets obtained by sandwiching an elastic filament between two fiber sheets and stretching the tooth groove, as described in paragraphs

[0012] to

[0085] of Japanese Patent Publication No. 2008-179128 and

[0013] to

[0051] of Japanese Patent Publication No. 2007-22066, stretchable films as described in paragraph

[0079] of Japanese Patent Publication No. 2019-103889, polyurethane films, and the like.

[0054] Next, a preferred configuration of the dorsal portion 10R of the diaper 10 will be described with reference to Figure 10.

[0055] The dorsal outer casing 22, which forms the outer surface body of the dorsal portion 10R, preferably has a laminated structure in which an outer layer sheet 63 and an inner layer sheet 64 are arranged between these sheets, similar to the ventral outer casing 21, which forms the outer surface body of the ventral portion 10F. The arrangement configuration and joining position of the waist elastic body 7 in the dorsal outer casing 22 can be the same as the arrangement configuration and joining position of the waist elastic body 7 in the ventral outer casing 21.

[0056] The dorsal outer casing 22, similar to the ventral outer casing 21, preferably has a region 3 in the overlapping region 10H where the dorsal outer casing 22 and the absorbent body 1 are joined and fixed together. This region 3 is the part in which the inner layer sheet 64 of the dorsal outer casing 22 and the back surface sheet 15 of the absorbent body 1 are joined and fixed together in the thickness direction, thereby integrating the dorsal outer casing 22 and the absorbent body 1.

[0057] In the dorsal bonding region 3, the bonding region between the dorsal outer casing 22 and the absorbent body 1 is preferably configured to include three regions with different lengths in the waist circumference direction X, as shown in Figure 10. Specifically, the dorsal bonding region 3 includes a dorsal central narrow bonding region 32, and a dorsal upper wide bonding region 31 and a dorsal lower wide bonding region 33, which are located above and below the dorsal central narrow bonding region 32 in the body length direction Y, and have a wider width in the waist circumference direction X than the dorsal central narrow bonding region 32. These bonding regions are adjacent to each other and can be distinguished based on the difference in width in the waist circumference direction X. In the example shown in Figure 10, the dorsal lower wide bonding region 33 has a stepped planar shape with two different widths in the waist circumference direction X.

[0058] In the diaper 10, the overlapping region 10H between the dorsal outer casing 22 and the absorbent body 1 corresponds to the area covering the skin surface in the body length direction Y from the height of the lumbar vertebrae to the area above the height of the coccyx on the wearer's back. Within this region, the dorsal upper wide joint region 31 is positioned opposite the lumbar vertebrae on the wearer's back. The dorsal central narrow joint region 32 is positioned opposite the area from the lower end of the lumbar vertebrae to the upper part of the buttocks (at the height of the sacrum). The dorsal lower wide joint region 33 is positioned opposite the area above the height of the wearer's coccyx. This allows the absorbent material 16 to bend by utilizing the upward force when the wearer is being held or sitting, causing the absorbent material 16 to be pushed up, thereby acting as a leak barrier against feces. This effect is further enhanced when combined with the configurations related to each of the tensile stress regions, which will be described later.

[0059] It is preferable that the length H6 in the height direction Y of the narrow joint region 32 in the central part of the back is longer than the length H5 in the height direction Y of the wider joint region 31 in the upper part of the back. It is preferable that the length H6 in the height direction Y of the narrow central joint region 32 on the dorsal side is approximately the same as or longer than the length H7 in the height direction Y of the wider lower joint region 33 on the dorsal side. In the above relationship, the ratio (H6 / (H5+H7)) of the length H6 in the body height direction Y of the narrow central joint region 32 on the back to the sum of the lengths H5 and H7 in the body height direction Y of the upper wide joint region 31 and the lower wide joint region 33 on the back is preferably 0.4 or more, more preferably 0.6 or more, and even more preferably 0.8 or more, from the viewpoint of making the absorbent material 16 or absorbent body 1, which is bent when being held, more likely to act as a leak-proof barrier. Furthermore, the ratio (H6 / (H5+H7)) is preferably 4 or less, more preferably 3.5 or less, and even more preferably 3 or less, from the viewpoint of improving the adhesion between the absorbent body 1 and the back outer casing 22.

[0060] The wide upper dorsal joint region 31 is preferably in the range of 0% to 50% and more preferably in the range of 10% to 40% when the end on the waist opening 12 side in the length direction Y is defined as 0% and the end on the crotch area 10C side is defined as 100% in the region 10H where the dorsal outer casing 22 and the absorbent main body 1 overlap, respectively. The wide central joint area 32 on the back side is preferably in the range of 20% to 80% and more preferably in the range of 30% to 70% when the end on the waist opening 12 side in the length direction Y is set to 0% and the end on the crotch area 10C side is set to 100% in the area 10H where the back outer casing 22 and the absorbent main body 1 overlap, respectively. The wide lower dorsal joint region 33 is preferably in the range of 40% to 100% and more preferably in the range of 60% to 95% when the end on the waist opening 12 side in the length direction Y is set to 0% and the end on the crotch area 10C side is set to 100% in the region 10H where the dorsal outer casing 22 and the absorbent main body 1 overlap, respectively.

[0061] The width W8 in the waist circumference direction X of the narrow central dorsal joint region 32 is smaller than the widths W7 and W9 of the upper wide dorsal joint region 31 and the lower wide dorsal joint region 33. As a result, similar to the ventral portion 10F, in the dorsal non-jointed region 42 outside the waist circumference direction X of the narrow central dorsal joint region 32, the absorbent body 1 becomes a curved portion that faces the skin along the length direction Y. In addition, similar to the ventral portion 10F, the leg gather elastic body 18 extends to the dorsal non-jointed region 42. As a result, in the dorsal non-jointed region 42, the same effect as in the ventral non-jointed region 41 occurs, and the bending portion that deforms along the length direction Y curves inward in the waist circumference direction X. In this way, in the dorsal portion 10R as well, the absorbent body 1 wraps around the lower end of the wearer's lumbar spine, the upper part of the buttocks (at the height of the sacrum), and even the crotch, thereby improving the prevention of leakage from the crotch of the diaper 10.

[0062] From the viewpoint of the above, the width W8 of the narrow central joint region 32 on the dorsal side is preferably 90% or less of the width W7 of the upper wide joint region 31 on the dorsal side and 85% or less of the width W9 of the lower wide joint region 33 on the dorsal side, more preferably 80% or less. Furthermore, from the viewpoint of improving the adhesion between the absorbent body 1 and the dorsal outer casing 22, the width W8 is preferably 10% or more of the width W7 and W9, more preferably 15% or more, and even more preferably 20% or more. The width W8 is preferably the same as the width W2 of the ventral central narrow junction region 52.

[0063] The widths W7 and W9 of the upper dorsal wide joint region 31 and the lower dorsal wide joint region 33 in the waist circumference direction X may be the same or different. From the viewpoint of improving the flexibility of the absorbent material 16 or absorbent body 1, it is preferable that they be the same. The widths W7 and W9 of the wide upper dorsal joint region 31 and the wide lower dorsal joint region 33 in the waist circumference direction X may be the same as the width of the absorbent body 1 in the waist circumference direction X, or they may be shorter. From the viewpoint of making it easier to widen the waist circumference, it is preferable to make them shorter than the absorbent body 1. In the example shown in Figure 10, in the lower back wide joint region 33 with a stepped planar shape, the width of the wider region is denoted as W7A, and the width of the narrower region as W7B. Preferably, both widths W7A and W7B are within the range of width W7, and preferably, width W7B is the same as or slightly narrower than the distance between two points in the waist circumference direction X of the folded-over portions of the left and right side sheets.

[0064] The dorsal central narrow joint region 32 is preferably located in the center of the dorsal outer casing 22 in the direction X around the waist. The width W8 of the narrow central joint region 32 on the back side in the waist direction X is preferably 50% or less, more preferably 40% or less, and even more preferably 30% or less, of the width W10 of the back outer body 22 in the waist direction X, from the viewpoint of making it easier for the absorbent body 1 to bend when the wearer's body bends. Furthermore, the width W8 is preferably 10% or more, and more preferably 15% or more, from the viewpoint of improving the fit of the back portion 10R. With this configuration, the area on the outer side of the narrow central joint region 32 on the back side can sufficiently bend in response to the force that pushes up the absorbent body 16 when the wearer sits down, etc.

[0065] In addition, the dorsal outer casing 22, like the ventral outer casing 21, preferably has multiple regions where the tensile stress in the direction X around the waist due to the waist elastic body 7 differs from each other. Specifically, a pair of dorsal lower low tensile stress regions 96 are arranged to the left and right outward in the direction X around the waist of the dorsal lower wide joint region 33, and a pair of dorsal high tensile stress regions 95, which have a higher tensile stress than the dorsal lower low tensile stress regions 96, are arranged to the left and right outward in the direction X around the waist of the dorsal central narrow joint region 32. Furthermore, a pair of dorsal upper low tensile stress regions 94 may be arranged to the left and right outward in the direction X around the waist of the dorsal upper wide joint region 31. The tensile stress refers to the contractile force in the above region against an external force attempting to stretch it. The magnitude of the tensile stress indicates the relative magnitudes of the contractile forces in each region of the dorsal outer casing 22, which includes the elastic body 7. The dorsal lower low tensile stress region 96 has a smaller tensile stress and smaller contractile force than the dorsal high tensile stress region 95. In other words, the dorsal high tensile stress region 95 has a larger tensile stress and larger contractile force than the dorsal lower low tensile stress region 96. Furthermore, the dorsal high tensile stress region 95 has a larger tensile stress and larger contractile force than the dorsal upper low tensile stress region 94.

[0066] The magnitude of the tensile stress in each tensile stress region of the dorsal outer casing 22 can be determined by various methods, similar to the magnitude of the tensile stress in each tensile stress region of the ventral outer casing 21.

[0067] The lower dorsal low-extension stress region 96 consists of a laminated structure of the outer layer sheet 63, the inner layer sheet 64, and the elastic body 7 that constitute the dorsal outer casing 22. The lower dorsal low-extension stress region 96 is mainly located in the region where the dorsal outer casing 22 does not overlap with the absorbent body 1 (the region to the left and right in the waist direction X from the region 10H where the dorsal outer casing 22 and the absorbent body 1 overlap). However, as long as the above relationship of magnitude of extension stresses holds, it may overlap with part of the arrangement position of the leg gather elastic body 18 at the end of the absorbent body 1 in the waist direction X. This configuration also applies to the upper dorsal low-extension stress region 94. The dorsal high-extension stress region 95 consists of a laminated structure of the outer layer sheet 63, the inner layer sheet 64, and the elastic body 7 that constitute the dorsal outer casing 22. However, since the dorsal high-extension stress region 95 is located to the left and right outward in the waist direction X of the dorsal central narrow joint region 32, it includes a portion of the dorsal outer casing 22 that overlaps with the absorbent body 1 without being joined.

[0068] The configuration of the dorsal outer casing 22 and the absorbent body 1 can be more specifically the same as the configuration of the ventral outer casing 21 and the absorbent body 1 shown in Figures 3 to 6.

[0069] The structure relating to the joining of the dorsal outer casing 22 and the absorbent body 1, and the structure having regions with different tensile stress, produce the same effect as in the case of the ventral outer casing 21. Specifically, when the wearer is seated or held using a baby carrier or by hand, the force pushing up the absorbent body 16 or absorbent body 1 can be used to bend the absorbent body 1 (dorsal non-jointed region 42) located to the left and right outward in the waist direction of the dorsal central narrow joining region 32. At the same time, the tensile stress of the dorsal high tensile stress region 95 propagates, allowing the leak-proof rift created by the bend to adhere tightly to the wearer's skin without any gaps. In this way, when the wearer is held or carried, it is made less likely for feces to be pushed out of the diaper 10.

[0070] Furthermore, it is preferable that the absorbent body 1 has an absorbent 16, and that this absorbent 16 is located in a region that overlaps with the dorsal central narrow joint region 32, the dorsal upper wide joint region 31, and the dorsal lower wide joint region 33, and that the basis weight of the absorbent 16 in the region that overlaps with the dorsal central narrow joint region 32 is lower than the basis weight in the region that overlaps with the dorsal lower wide joint region 33. By reducing the basis weight of the absorbent 16 located in the area overlapping with the narrow central region 32 on the back side, the rigidity of this region can be lowered. As a result, the absorbent 16 (absorbent body 1) located in the area bonded to the back outer casing 22 becomes more flexible, influenced by the bending of the absorbent 16 (absorbent body 1) located in the area overlapping with the non-bonded region 42 on the back side. This allows for the formation of a leak-proof barrier across the entire width of the absorbent 16 (absorbent body 1).

[0071] From the viewpoint of improving the flexibility of the absorbent material 16 or absorbent body 1 in the dorsal portion 10R, the basis weight of the absorbent material 16 located in the area overlapping with the dorsal central narrow joint area 32 is preferably 90% or less, more preferably 70% or less, and even more preferably 50% or less, of the basis weight of the absorbent material 16 located in the area overlapping with the dorsal lower wide joint area 33. Furthermore, from the viewpoint of improving liquid absorption at the dorsal portion 10R, the basis weight of the absorbent 16 placed in the area overlapping with the dorsal central narrow joint region 32 is preferably 10% or more, more preferably 15% or more, and even more preferably 25% or more, of the basis weight of the absorbent 16 placed in the area overlapping with the dorsal lower wide joint region 33.

[0072] Each component of the diaper 10 can be formed using various materials used in this type of article. For example, the materials for the outer layer sheet 61 and inner layer sheet 62 constituting the outer casing 2 include nonwoven fabrics, woven fabrics, knitted fabrics, and resin films produced by various manufacturing methods, such as air-through nonwoven fabrics, heat-rolled nonwoven fabrics, spunlace nonwoven fabrics, spunbond nonwoven fabrics, and melt-blown nonwoven fabrics, respectively. Sheet materials formed by laminating and integrating these materials can also be used. Various materials can be used for this purpose. For example, synthetic fibers made of polyethylene, polypropylene, polyester, and other thermoplastic resins can be used. Furthermore, the inner layer sheet 62 is preferably made of nonwoven fabric from the viewpoint of improving breathability and texture, and is preferably made of water-repellent nonwoven fabric from the viewpoint of preventing leakage of excrement. The absorbent 16 can be any material used in this type of article without any particular limitations. For example, it can be an absorbent core made of a hydrophilic fiber aggregate covered with a core wrap sheet. The absorbent core may further contain a superabsorbent polymer. The material of the core wrap sheet can be paper or pulp sheet manufactured using hydrophilic fibers as raw materials, or a hydrophilic nonwoven fabric. Furthermore, the absorbent 16 may be in the form of a sheet. Examples of such sheet-like materials include paper or pulp sheets manufactured using hydrophilic fibers as raw materials. Other examples include absorbent sheets in which an absorbent core made of an aggregate of superabsorbent polymer material is sandwiched and fixed between two base sheets (absorbent paper or nonwoven fabric) (for example, the absorbent sheet described in Japanese Patent Application Publication No. Hei 8-246395 and the polymer sheet described in Japanese Patent Application Publication No. 2004-275225).

[0073] As for the materials of the various elastic bodies mentioned above, ordinary elastic materials used in wearable items such as diapers and sanitary napkins can be used. For example, the materials can include synthetic rubbers such as styrene-butadiene, butadiene, isoprene, and neoprene, natural rubber, EVA, stretchable polyolefin, and polyurethane. In terms of form, thread-like or string-like materials (such as flat rubber) with a rectangular, square, circular, or polygonal cross-section can be used, or multifilament-type thread-like materials can be used.

[0074] Furthermore, the materials constituting the absorbent body 1 can be any material commonly used in this type of diaper without any particular restrictions.

[0075] The pant-type wearable article of the present invention is not limited to the embodiment of the diaper 10 described above, but is a concept that includes various items having a pant-type structure. Furthermore, the pant-type wearable article of the present invention may be for infants or adults, and may take a form other than a diaper. For example, other forms may include sanitary shorts, panty-type sanitary napkins, disposable shorts, etc. Also, it is not limited to those equipped with an absorbent body like the pant-type wearable article 10 described above, but may also be a diaper cover or underwear without an absorbent body.

[0076] With regard to the embodiments described above, the present invention further discloses the following pant-type wearable articles. <1> A pant-type wearable article having an absorbent body and an outer casing, comprising an abdominal portion positioned on the wearer's abdominal side, a crotch portion positioned on the groin side, and a back portion positioned on the back side, having a waist circumference direction and a body length direction, The outer coverings on the ventral and dorsal sides are joined at both ends in the direction of the waist by a pair of waist joints, and waist openings are located on the upper sides of the ventral and dorsal sides in the direction of the body length. The absorbent body extends along the length direction from the center in the waist direction and is joined and fixed to the outer casing on the ventral and dorsal sides. Multiple waist elastic bodies, which extend along the direction of the waist circumference and are spaced apart along the direction of the body length, are stretchably joined to the outer body in the ventral and dorsal portions. The ventral portion has a region where the outer casing and the absorbent body are joined and fixed, and this region includes a central narrow joining region and an upper wide joining region and a lower wide joining region, which are located above and below the central narrow joining region in the body length direction and are wider in the waist circumference direction than the central narrow joining region. The ventral portion has multiple regions in which the tensile stress in the direction around the waist due to the waist elastic body differs from one another, with lower low tensile stress regions located to the left and right outer sides in the direction around the waist of the lower wide joint region, and high tensile stress regions located to the left and right outer sides in the direction around the waist of the central narrow joint region, having a higher tensile stress than the lower low tensile stress regions. Pants-type garments.

[0077] <2> The outer covering on the ventral side has a folded portion that is folded back towards the absorbent main body at the waist opening, and the folded portion is joined to the skin side of the absorbent main body by a folded joint portion formed along the direction of the waist circumference, and the folded joint portion overlaps at least a portion with the upper wide joining region, <1> The pant-type garment described above. <3> The absorbent body has an absorbent material, the absorbent material comprises a high-basis-weight portion and a low-basis-weight portion with different basis weights, the ventral portion includes the high-basis-weight portion, and the boundary between the high-basis-weight portion and the low-basis-weight portion partially overlaps with the upper wide joining region, <1> or <2> The pant-type garment described above. <4> The tensile stress in the lower low tensile stress region is 10% or more and 80% or less of the tensile stress in the high tensile stress region. <1> ~ <3> Pants-type wearable item as described in any one of the following. <5> The upper wide joint region has an upper low-extension stress region on the left and right sides in the direction of the waist, where the extension stress in the direction of the waist is lower than that of the high-extension stress region. <1> ~ <4> Pants-type wearable item as described in any one of the following. <6> The central narrow joint region is located in the central part of the outer body in the direction of the waist on the ventral side, and the width of the central narrow joint region in the direction of the waist is 30% or less of the width of the outer body in the direction of the waist on the ventral side, <1> ~ <5> Pants-type wearable item as described in any one of the following. <7> The absorbent body has leg gather elastic bodies on both sides in the length direction, the leg gather elastic bodies are joined so as to be expandable and contractible along the length direction, and the leg gather elastic bodies have joining and fixing portions at both ends in the length direction for joining to other components of the absorbent body. The leg gather elastic body has an overlapping portion with the lower wide joining region, <1> ~ <6> Pants-type wearable item as described in any one of the following. <8> The central narrow joining region has non-jointed regions on the left and right outward sides in the direction of the waist, where the outer casing and the absorbent body on the ventral side are not joined. The leg gather elastic body extends to the non-joined region, <7> The pant-type garment described above. <9> The high basis weight portion of the absorbent body has, in a plan view, a wide absorbent portion located on the ventral side, a narrow absorbent portion located in the crotch area, and an inclined absorbent portion connecting the wide absorbent portion and the narrow absorbent portion. The intersection of the outer edge of the wide absorbent portion in the direction of the waist and the outer edge of the inclined absorbent portion in the direction of the waist is located at a position that overlaps with the lower wide joining region on the ventral side, <3> The pant-type garment described above. <10> The absorbent body has leg gather elastic bodies on both sides in the length direction, the leg gather elastic bodies are joined so as to be expandable and contractible along the length direction, and the leg gather elastic bodies have joining and fixing portions at both ends in the length direction for joining to other components of the absorbent body. The leg gather elastic body has a joint fixing portion, and the intersection point of the outer edge in the waist direction of the wide absorbent portion in the high basis weight portion of the absorbent body and the outer edge in the waist direction of the inclined absorbent portion and the overlapping region of the lower wide joint region, <9> The pant-type garment described above. <11> The central narrow joining region has non-jointed regions on the left and right outward sides in the direction of the waist, where the outer casing and the absorbent body on the ventral side are not joined. The leg gather elastic body extends to the non-joined region, <10> The pant-type garment described above. <12> The waist elastic body disposed in the lower low-extension stress region extends inward in the direction around the waist beyond the overlapping portion or the overlapping region, <7> or <10> The pant-type garment described above. <13> The waist elastic body is composed of a thread-like elastic material or a string-like elastic material, <1> ~ <12> Pants-type wearable item as described in any one of the following. <14> In the ventral portion of the outer casing, a thread-like or string-like elastic material and an elastic sheet are arranged as elastic bodies, and in a part of the lower low-stress region, there is a portion in which only the elastic sheet is arranged as the elastic body, <1> ~ <12> Pants-type wearable item as described in any one of the following. <15> The back portion has a region in the back portion where the outer casing and the absorbent body are joined and fixed, and this region includes a narrow central back joint region, and a wider upper back joint region and a wider lower back joint region, which are arranged above and below the narrow central back joint region in the body length direction and are wider in the waist direction than the narrow central back joint region. The dorsal portion has a plurality of regions in which the tensile stress in the direction around the waist due to the waist elastic body differs from one another, and a dorsal lower low tensile stress region is arranged to the left and right outward in the direction around the waist of the dorsal lower wide joint region, and a dorsal high tensile stress region is arranged to the left and right outward in the direction around the waist of the dorsal central narrow joint region, wherein the tensile stress is higher than that of the dorsal lower low tensile stress region. <1> ~ <14> Pants-type wearable item as described in any one of the following. <16> The absorbent body has an absorbent material, and the absorbent material is located in a region that overlaps with the narrow central joint region on the back side, the wide upper joint region on the back side, and the wide lower joint region on the back side. The absorbent material has a basis weight in the region overlapping with the narrow central joint region on the back side, which is lower than the basis weight in the region overlapping with the wide lower joint region on the back side. <15> The pant-type garment described above. <17> The ratio (H6 / (H5+H7)) of the length H6 in the body length direction of the narrow central joint region on the back to the sum of the lengths H5 and H7 in the body length direction of the upper wide joint region on the back and the lower wide joint region on the back is 0.4 or more and 4 or less, preferably 0.6 or more, more preferably 0.8 or more, preferably 3.5 or less, more preferably 3 or less, <15> or <16> The pant-type garment described above. <18> The aforementioned wide upper back joining region is in the region where the outer covering and the absorbent body overlap on the back side, and when the end on the waist opening side in the length direction is defined as 0% and the end on the crotch side as 100%, it is in the range of 0% to 50%, preferably in the range of 10% to 40%. <15> ~ <17> Pants-type wearable item as described in any one of the following. <19> The aforementioned wide central joint region on the back is located in the area where the outer covering and the absorbent body overlap on the back, and when the end on the waist opening side in the length direction is set to 0% and the end on the crotch side is set to 100%, it is in the range of 20% to 80%, preferably in the range of 30% to 70%. <15> ~ <18> Pants-type wearable item as described in any one of the following. <20> The aforementioned wide lower back joining region is in the region where the outer covering and the absorbent body overlap on the back side, and when the end on the waist opening side in the length direction is set to 0% and the end on the crotch side is set to 100%, it is in the range of 40% to 100%, preferably in the range of 60% to 95%. <15> ~ <19> Pants-type wearable item as described in any one of the following. <21> The width of the narrow central joint region on the dorsal side is 10% to 90% of the width of the upper wide joint region on the dorsal side and the lower wide joint region on the dorsal side, respectively, preferably 85% or less, more preferably 80% or less, and preferably 15% or more, more preferably 20% or more. <15> ~ <20> Pants-type wearable item as described in any one of the following. [Explanation of Symbols]

[0078] 1 Absorbent body 14 Surface sheet 15 Back sheet 16 Absorbent 16A Upper absorption layer 16B Lower absorption layer 161 High basis weight part 162 Low basis weight part 163 Boundary between high-basis-weight section and low-basis-weight section 164 Wide absorbent area 165 Narrow absorbent section 166 Incline absorption section 167 Intersection of the outer edge of the wide absorbent section in the direction of waist circumference and the outer edge of the inclined absorbent section in the direction of waist circumference 17 Side Seats 18 Leg Gather Elastic Body 181 Leg Gather Joint Fixing Part 2. Exterior 21 Ventral outer casing 22 Dorsal exterior body 23 Folded section 231 Folded joint 3. The region on the dorsal side where the outer casing and the absorbent body are joined and fixed together (dorsal joining region) 31 Wide dorsal upper bonding region 32 Dorsal central narrow junction area 33 Dorsal lower wide bonding region 41 Ventral nonunion area 42 Dorsal nonunion area 5. Region where the outer casing and the absorbent body are joined and fixed together on the ventral side. 51 Upper wide joint area 52 Central narrow joint area 53 Lower wide joint area 51A The bonding layer between the ventral outer casing and the absorbent body, located in the upper wide bonding region. 52A Adhesive layer between the ventral outer casing and the absorbent body, located in the central narrow bonding region. 53A A bonding layer between the ventral outer casing and the absorbent body, located in the lower wide bonding region 53. 61, 63 Outer layer sheet 62, 64 Inner layer sheets 7. Waist elastic material 71 Elastic body in the upper low elongation stress region 72 Elastic bodies in the high elongation stress region 73 Elastic bodies in the lower low-extension stress region 74 Elastic material around the waist opening 75 Extendable Sheet 8 Crotch side extension 81 Folds 91 Upper low elongation stress region 92 High Elongation Stress Region 93 Lower low tensile stress region 94 Dorsal upper low-extension stress region 95 Dorsal high-extension stress region 96 Dorsal inferior low-extension stress region P overlapping region Q Overlapping parts 10 diapers 10F The abdominal side of the diaper 10C Diaper crotch area 10R Diaper back side 10D diaper waistband 10G Region where the ventral outer casing 21 and the absorbable body 1 overlap 11 Waist joint 12 Waist opening 13 Leg opening Y Diaper length direction (or the long direction of the absorbent body) X Diaper waist circumference in the width direction (or width direction of the absorbent body)

Claims

1. A pants-type wearing article having an absorbent main body and an outer body, and including a ventral side portion disposed on the ventral side of a wearer, a crotch portion disposed on the crotch side, and a dorsal side portion disposed on the dorsal side, and having a waist circumference direction and a body length direction, The exterior bodies in the abdominal portion and the back portion are joined at a pair of waist joints at both ends in the waist circumference direction, and waist openings are arranged on the upper sides of the abdominal portion and the back portion in the body length direction, the absorbent main body extends along the body length direction at the center in the waist circumference direction, and is joined and fixed to the exterior body in the abdominal side portion and the back side portion, A plurality of waist elastics are stretchably joined to the exterior body in the abdominal side portion and the back side portion, the waist elastics extending along the waist circumference direction and arranged at intervals along the body length direction, the abdominal portion has a region where the exterior body and the absorbent main body are joined and fixed, and the region includes a central narrow joining region, and an upper wide joining region and a lower wide joining region which are arranged above and below the central narrow joining region in the body length direction and which are wider in the waist circumference direction than the central narrow joining region; The abdominal portion has a plurality of regions in which the elongation stress in the waist circumference direction due to the waist elastic body is different from one another, and lower low elongation stress regions are arranged on the left and right outer sides of the lower wide joining region in the waist circumference direction, and high elongation stress regions having elongation stress higher than that of the lower low elongation stress regions are arranged on the left and right outer sides of the central narrow joining region in the waist circumference direction. Pants-type wearable item.

2. 2. The pants-type wearing article according to claim 1, wherein the outer body in the abdominal region has a folded portion folded toward the absorbent main body at the waist opening, the folded portion being joined to the skin-facing side of the absorbent main body by a folded joint formed along the waist circumference direction, and the folded joint at least partially overlaps with the upper wide joint region.

3. 3. The pants-type wearing article according to claim 1, wherein the absorbent main body has an absorbent body, the absorbent body having a high basis weight portion and a low basis weight portion with different basis weights, the high basis weight portion is included in the abdominal portion, and a boundary between the high basis weight portion and the low basis weight portion partially overlaps with the upper wide bonding region.

4. 3. The pants-type wearing article according to claim 1, wherein the tensile stress of the lower low tensile stress region is 10% to 80% of the tensile stress of the high tensile stress region.

5. 3. The pants-type wearing article according to claim 1, further comprising upper low-tensile stress regions on the left and right outer sides of the upper wide bonding region in the waist direction, the upper low-tensile stress regions having lower tensile stress in the waist direction than the high-tensile stress regions.

6. 3. The pants-type wearing article according to claim 1, wherein the central narrow seam region is located in a central portion of the outer body in the waist circumference direction in the abdominal side portion, and the width of the central narrow seam region in the waist circumference direction is 30% or less of the width of the outer body in the waist circumference direction in the abdominal side portion.

7. the absorbent main body has leg gather elastics on both sides in the body length direction, the leg gather elastics are joined in a stretchable manner along the body length direction, and the leg gather elastics have joining and fixing parts at both ends in the body length direction that are joined and fixed to other components of the absorbent main body, 3. The pants-type wearing article according to claim 1, further comprising an overlapping portion between the joint fixing portion of the leg gather elastic body and the lower wide joint region.

8. a non-bonded region in which the exterior body and the absorbent main body in the abdominal portion are not bonded to each other on the left and right outer sides of the central narrow bonded region in the waist circumference direction; The pants-type wearing article according to claim 7, wherein the leg gather elastics extend to the non-bonded regions.

9. The high basis weight portion of the absorbent body has, in a plan view, a wide absorbent portion disposed in the abdominal side portion, a narrow absorbent portion disposed in the crotch portion, and an inclined absorbent portion connecting the wide absorbent portion and the narrow absorbent portion, 4. The pants-type wearing article according to claim 3, wherein an intersection of an outer edge of the wide absorbent portion in the waist direction and an outer edge of the inclined absorbent portion in the waist direction is located at a position overlapping the lower wide bonding region in the abdominal side portion.

10. the absorbent main body has leg gather elastics on both sides in the body length direction, the leg gather elastics are joined in a stretchable manner along the body length direction, and the leg gather elastics have joining and fixing parts at both ends in the body length direction that are joined and fixed to other components of the absorbent main body, 10. The pants-type wearing article according to claim 9, further comprising: a joining and fixing portion of the leg gather elastic body; an overlapping region between an intersection of an outer edge of the wide absorbent portion in the waist-circumferential direction and an outer edge of the inclined absorbent portion in the waist-circumferential direction in the high basis weight portion of the absorbent body; and the lower wide joining region.

11. a non-bonded region in which the exterior body and the absorbent main body in the abdominal portion are not bonded to each other on the left and right outer sides of the central narrow bonded region in the waist circumference direction; The pants-type wearing article according to claim 10, wherein the leg gather elastics extend to the non-bonded regions.

12. 8. The pants-type wearing article according to claim 7, wherein the waist elastics disposed in the lower low elongation stress region extend beyond the overlapping portion or the overlapping region to an inner side in the waist circumference direction.

13. 3. The pants-type wearing article according to claim 1, wherein the waist elastics are made of a thread-like elastic material or a string-like elastic material.

14. 3. The pants-type wearing article according to claim 1, wherein a thread-like elastic material or a string-like elastic material and an elastic sheet are arranged as elastic bodies in the outer body in the abdominal portion, and a part of the lower low-elongation stress region has a portion where only the elastic sheet is arranged as the elastic body.

15. The back side portion has a region where the exterior body and the absorbent main body in the back side portion are joined and fixed, and the region includes a back side central narrow joining region, and a back side upper wide joining region and a back side lower wide joining region which are arranged above and below the back side central narrow joining region in the body length direction and which have a width in the waist circumference direction wider than that of the back side central narrow joining region, 3. The pants-type wearing article according to claim 1 or 2, wherein the back portion has a plurality of regions in which the elongation stress in the waist direction caused by the waist elastics is different from one another, and a back lower low elongation stress region is arranged to the left and right outside of the back lower wide joint region in the waist direction, and a back high elongation stress region in which the elongation stress is higher than that of the back lower low elongation stress region is arranged to the left and right outside of the back central narrow joint region in the waist direction.

16. The absorbent main body has an absorbent body, and the absorbent body is present in an area overlapping the back central narrow bonding area, the back upper wide bonding area, and the back lower wide bonding area; The pants-type wearing article according to claim 15, wherein the absorbent body has a basis weight in a region overlapping with the back central narrow bonding region that is lower than a basis weight in a region overlapping with the back lower wide bonding region.

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