Pant-type wearable article

Abstract

To provide a pants type wearing article which easily follows a back side below a waist, especially roundness around buttocks.SOLUTION: A pants type wearing article 10 comprises a ventral part disposed on an abdominal side of a wearer, a crotch part disposed on a crotch side 10C, and a back part disposed on a back side, and has a direction around a waist and a height direction Y. The pants type wearing article comprises a waist opening disposed on the upper side of the ventral part and the back part in the height direction, and a pair of leg openings disposed on the right and left of the crotch part. A back-side outer cover body 22 forming an outer body of the back part has, on a skin side and a non-skin side of the back-side outer cover body of a region 3 on the leg opening side, a skin side elastic region and a non-skin side elastic region with elasticity necessary for expansion and contraction at least in the direction around the waist, and these regions have an elastic overlapping part 4, where they overlap each other in the thickness direction of the back-side outer cover body. In the direction around the waist, the shrinkage factor of the skin side elastic region is larger than that of the non-skin side elastic region in the direction around the waist. The back-side outer cover body has a crotch side extended part which overlaps the overlapping part as an outer body on a buttocks side of the crotch part.SELECTED DRAWING: Figure 4

Description

Technical Field

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

Background Art

[0002] Wearable articles such as diapers come in forms such as tape type and pant type. Pant-type wearable articles have a waist opening at the top and leg openings on the left and right of the crotch. The waist opening and leg openings are provided with elastic bodies (stretching members) such as thread rubber, and have a structure with good fit to the body. Patent Documents 1 and 2 describe techniques for improving the fit around the waist, such as preventing the waist end from rolling up and preventing marks, by devising the configuration of the elastic member arranged around the waist.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] In order to enhance the above-mentioned fit, it is required to make the pant-type wearable article conform to the body shape of the wearer and minimize the gap between the body surface. However, the body shapes of wearers vary, and the degree of roundness around the back below the waist, particularly around the buttocks, is diverse. Therefore, in pant-type wearable articles, there is a limit to sufficiently conforming to the diversity of the roundness with only the conventional elasticity of the waist and leg parts, and there is room for improvement.

[0005] In view of the above points, the present invention relates to the provision of a pant-type wearable article that is easily adaptable to the roundness of the wearer's back below the waist, particularly around the buttocks.

Means for Solving the Problem

[0006] The present invention is a pant-type wearing article including a ventral part arranged on the ventral side of the wearer, a crotch part arranged on the crotch side, and a dorsal part arranged on the dorsal side, and having a waist circumference direction and a body length direction, the pant-type wearing article includes a waist opening arranged above the ventral part and the dorsal part in the body length direction, and a pair of leg openings arranged on the left and right sides of the crotch part, the dorsal outer body forming the outer surface body of the dorsal part has a skin-side elastic region and a non-skin-side elastic region having at least elasticity necessary for expansion and contraction in the waist circumference direction on the skin side and the non-skin side of the dorsal outer body in the region on the leg opening side, the dorsal outer body has an elastic overlapping part where the skin-side elastic region and the non-skin-side elastic region overlap each other in the thickness direction of the dorsal outer body, and in this overlapping part, the contraction magnification in the waist circumference direction of the skin-side elastic region is larger than the contraction magnification in the waist circumference direction of the non-skin-side elastic region, and the dorsal outer body has a crotch-side extension continuous with the overlapping part as the outer surface body on the buttocks side of the crotch part, A pant-type wearing article is provided.

Advantages of the Invention

[0007] The pant-type wearing article of the present invention is more likely to follow the roundness on the dorsal side below the waist of the wearer's body, particularly the roundness around the buttocks.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

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Figure 4

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Figure 16

[0009] Hereinafter, a preferred embodiment of the pant-type wearing article of the present invention will be described below with reference to the drawings. In this specification, the side that contacts the wearer's skin is referred to as the skin side or the inner side, and the opposite side is referred to as the non-skin side or the outer side. These are also used as terms indicating the relative positional relationship in the member configuration of the absorbent article even for members that do not have a surface that contacts the wearer's skin. Also, the direction located on the front side of the wearer during wearing is referred to as the front or the front side, and the direction located on the rear side is referred to as the rear or the rear side. The normal direction of the surface or the back surface of the wearing article, that is, the stacking direction of the members, is referred to as the thickness direction.

[0010] As shown in FIG. 1, the pant-type diaper 10 of the present embodiment (hereinafter also referred to as the diaper 10) includes a ventral part 10F arranged on the ventral side of the wearer, a crotch part 10C arranged on the crotch side, and a dorsal part 10R arranged on the dorsal side, and has a waist-around direction X and a body length direction Y. Further, the diaper 10 includes a waist opening 12 arranged above the ventral part 10F and the dorsal part 10R in the body length direction Y, and a pair of leg openings 13, 13 arranged on the left and right of the crotch part 10C.

[0011] The diaper 10 has an absorbent main body 1 and an outer body 2 as constituent members. The outer body 2 has a ventral outer body 21 and a dorsal outer body 22 that form the outer surface main bodies of the ventral part 10F and the dorsal part 10R, respectively. The ventral outer body 21 and the dorsal outer body 22 are joined at the side seal part 11 with their both side edges overlapped. Thereby, an annular body circumference part 10D in the diaper 10 is formed. The joining at the side seal part 11 can be performed by various methods used for this type of article. For example, joining that integrates by pressure consolidation such as fusion bonding (for example, heat sealing, ultrasonic sealing, laser melting), pressure bonding (for example, embossing), etc. can be mentioned. Furthermore, the back outer body 22 extends in the body length direction Y beyond the position of the side seal part 11 to the crotch part 10C. In the extended part, a crotch side extension part 8 is formed which covers a part of the non-skin side of the absorbent main body 1 in the crotch part 10C. The crotch side extension part 8 is arranged as the outer surface main body on the buttocks side of the crotch part 10C. This crotch side extension part 8 can take various shapes that can cover a part of the non-skin surface side of the absorbent main body 1. Among them, from the viewpoint of suppressing the wrapping around the wearer's legs and improving the wearing feeling, the crotch side extension part 8 preferably has a curved shape such that the width in the waist circumference direction X gradually narrows from the lower end edges of the left and right side seal parts 11, 11 toward the crotch part 10C. The absorbent main body 1 is arranged on the skin side of the outer body 2 in the ventral part 10F and the dorsal part 10R, and the further extended part forms the crotch part 10C. In the diaper 10 having such a configuration, the open part above the body circumference part 10D becomes the aforementioned waist opening 12. The open parts on both the left and right sides of the crotch part 10C become the aforementioned pair of leg openings 13, 13.

[0012] Figure 2 shows a developed state with the diaper 10 broken at the side seal parts 11, 11. Here, the developed state means a state in which each part is extended and the pant-type absorbent article is spread flat. In the developed state, the aforementioned waist circumference direction X and the body length direction Y are also referred to as the width direction X and the longitudinal direction Y. In the developed state of the diaper 10, a horizontally long ventral outer body 21 and a dorsal outer body 22 are respectively arranged corresponding to the ventral part 10F and the dorsal part 10R. The vertically long absorbent main body 1 is arranged on the skin side of the ventral outer body 21 and the dorsal outer body 22 with its longitudinal direction directed toward the ventral part 10F, the crotch part 10C, and the dorsal part 10R of the diaper 10. The skin side of the end part of the absorbent main body 1 in the longitudinal direction Y is covered by the folded-back parts 23, 23 of the ventral outer body 21 and the dorsal outer body 22 arranged on the non-skin side. As shown in Fig. 2, the absorbent body 1 has a liquid-permeable surface sheet 14 on the skin side, a leak-proof 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 includes a pair of side sheets 17 on both sides in the longitudinal direction Y. Leg gather elastic bodies 18 joined in an extended state along the longitudinal direction Y are arranged at the outer ends of the side sheets 17 in the width direction X, and leg gathers are formed around the leg openings 13.

[0013] Next, the dorsal exterior body 22 will be described. The dorsal exterior body 22 that forms the outer surface body of the dorsal part 10R has a skin-side elastic region and a non-skin-side elastic region that are provided with at least the elasticity necessary for expansion and contraction in the waist-around direction X on the skin side and the non-skin side of the dorsal exterior body 22 in the regions 3 on the sides of the leg openings 13 (hereinafter also simply referred to as region 3). The dorsal exterior body 22 has an elastic overlapping portion 4 where the skin-side elastic region and the non-skin-side elastic region overlap each other in the thickness direction of the dorsal exterior body 22. In the overlapping portion 4, the contraction magnification of the skin-side elastic region in the waist-around direction X is made larger than the contraction magnification of the non-skin-side elastic region in the waist-around direction X. In the overlapping portion 4, the crotch-side extension 8 of the crotch part 10C described above is continuous.

[0014] As shown in Figs. 2 and 3, the "region 3" having the overlapping portion 4 is located at the positions on the sides of the leg openings 13 within the length range in the body length direction Y of the side seal portions 11, 11 in the dorsal exterior body 22. At this position in the body length direction Y, the region 3 is a region connecting between the side seal portions 11, 11 in the waist-around direction. In the above region 3, the "overlapping portion 4" is arranged. The "overlapping portion 4" may be in the entire region 3 or in a part thereof as long as the contraction difference described later is well exhibited. The position of the crotch direction Y in the region 3 is preferably within 60% of the length in the crotch direction Y corresponding to the side seal portions 11, 11 of the back outer body 22, more preferably within 45%, and even more preferably only at the lower end portion of the back outer body 22. By setting it within the above range, the action of the contraction force provided by the overlapping portion 4 can be more effectively transmitted by the thigh side extension portion 8. As a result, the overlapping portion 4 and the thigh side extension portion 8 connected to the overlapping portion 4 are likely to curl inward (skin side). Further, since the region 3 having the overlapping portion 4 is a part of the lower crotch side of the back outer body 22 as described above, an increase in the thickness of the back outer body 22, particularly the thickness of the waist circumference portion 222, can be suppressed, and a good wearing feeling such as fit can be maintained.

[0015] Also, as shown in FIG. 3, in the worn state of the diaper 10, the overlapping portion 4 corresponds to the lower part of the waist to the upper part of the buttocks of the wearer W. The thigh side extension portion 8 extending from the overlapping portion 4 toward the crotch portion 10C side is placed at a position covering the buttocks of the wearer W.

[0016] The overlapping portion 4 can be formed by various structures. For example, the overlapping portion 4 may be formed by a laminated structure including an outer layer portion, a middle layer portion, and an inner layer portion arranged in the region 3. The middle layer portion is a middle layer sheet made of a sheet material, the inner layer portion on the skin side of the middle layer sheet includes the aforementioned skin side elastic region, and the outer layer portion on the non-skin side of the middle layer sheet includes the aforementioned non-skin side elastic region. In this way, the aforementioned skin side elastic region and non-skin side elastic region are arranged at positions overlapping in the thickness direction of the back outer body 22 via the middle layer sheet. Further, the above laminated structure may be composed of the outer layer portion and the inner layer portion without the middle layer portion intervening therebetween. The elasticity in the skin side elastic region and the non-skin side elastic region of the overlapping portion 4 can be formed by various members having stretchable elasticity. Examples of such members include long elastic bodies and stretchable sheets. For example, in the laminated structure including the outer layer portion, the middle layer portion, and the inner layer portion described above, the outer layer portion and the inner layer portion may be formed including a long elastic body that can be stretched or a stretchable sheet that can be stretched.

[0017] Next, with reference to FIGS. 2 and 4, an example of a preferred configuration of the overlapping portion 4 provided with elasticity using an elastic body will be described.

[0018] As shown in FIGS. 2 and 4, the overlapping portion 4 of the region 3 of the back outer body 22 includes an outer layer sheet 61 made of a sheet material constituting the non-skin side outer surface, and an outer layer elastic body 71 that is interposed between the outer layer sheet 61 and the middle layer sheet 62 and is joined and fixed so as to be extensible. The outer layer sheet 61 and the outer layer elastic body 71 form the outer layer portion on the non-skin side of the middle layer sheet 62. The outer layer elastic body 71 is arranged having at least an extending direction in the waist circumferential direction X. Specifically, the outer layer elastic body 71 is in a thread-like or string-like shape, and a plurality of the outer layer elastic bodies 71 extend inward in the waist circumferential direction X so as to connect the side seal portions 11 while being joined and fixed to the left and right side seal portions 11. The aforementioned non-skin side elastic region includes the outer layer elastic body 71. Further, the overlapping portion 4 of the region 3 of the back outer body 22 includes an inner layer sheet 63 made of a sheet material constituting the skin side inner surface, and an inner layer elastic body 72 that is interposed between the inner layer sheet 63 and the middle layer sheet 62 and is joined and fixed so as to be extensible. Thereby, the inner layer portion on the skin side of the middle layer sheet 62 is formed. The inner layer elastic body 72 is arranged having at least an extending direction in the waist circumferential direction X. Specifically, the inner layer elastic body 72 is in a thread-like or string-like shape, and a plurality of the inner layer elastic bodies 72 extend in the waist circumferential direction X in at least a partial range that extends inward in the waist circumferential direction X from the left and right side seal portions 11, 11 while being joined and fixed to the side seal portions 11. The aforementioned skin side elastic region includes the inner layer elastic body 72.

[0019] The joining between the respective members in the above-described back exterior body 22 can be formed by various means commonly used in this type of article. For example, the respective members can be integrated by fusion bonding, pressure bonding, or bonding using a highly fluid adhesive such as a hot melt adhesive. There is no particular limitation on the method of applying a hot melt adhesive or the like, and for example, it may be either a contact type or a coating type method. For example, it can also be applied by a method such as spraying the adhesive along the direction in which the elastic body is disposed. Such joining can be similarly used for the joining between various members shown below.

[0020] The outer layer elastic body 71 and the inner layer elastic body 72 impart at least the elasticity necessary for expansion and contraction in at least a part of the region extending inward from the side seal portions 11, 11, at least in the waist circumferential direction X. The outer layer elastic body 71 and the inner layer elastic body 72 are arranged at positions where they overlap in the thickness direction to form an overlapping portion 4. The overlapping portion 4 is arranged in a part of the range extending inward in the waist circumferential direction X from the left and right side seal portions 11, 11 or over the entire waist circumferential direction X across the left and right side seal portions 11, 11 in the above-described region 3. Note that the above-mentioned "overlapping position" does not refer only to the case where the outer layer elastic body 71 and the inner layer elastic body 72 strictly overlap in the thickness direction, but rather means that they are in a close position where their elasticities affect each other via the middle layer sheet 62 and perform the actions described later.

[0021] (Method for defining the range of the body length direction Y of the overlapping portion 4) The range of the body length direction Y of the above-described overlapping portion 4 can be defined by the following method. (1) Method for determining the end on the leg opening 13 side of the overlapping position Let the distance from the end of the back exterior body 22 on the waist opening 12 side to the end of the inner layer elastic body 72 on the leg opening 13 side be 7A. Let the distance from the end of the back exterior body 22 on the waist opening 12 side to the end of the outer layer elastic body 71 on the leg opening 13 end be 7B. When this is done, the end of the elastic body with the shorter distance is taken as the end on the leg opening 13 side of the overlapping position. (2) Method for determining the end on the waist opening 12 side of the overlapping position Let the distance from the end of the dorsal outer body 22 on the waist opening 12 side to the end of the inner layer elastic body 72 on the waist opening 12 side be 7C. Let the distance from the end of the dorsal outer body 22 on the waist opening 12 side to the end of the outer layer elastic body 71 on the waist opening 12 side be 7D. When this is done, the end of the elastic body with the longer distance is set as the end on the waist opening 12 side of the overlapping position. (3) The range sandwiched between both ends of (1) and (2) above is defined as the range in the body length direction Y of the overlapping portion 4. There can be various patterns for the arrangement in the body length direction Y of the outer layer elastic body 71 and the inner layer elastic body 72 that form the overlapping portion 4 thus defined. For example, four modes as shown in FIGS. 5 to 8 can be included. In the mode shown in FIG. 5, regarding the above various distances, the relationship is 7A < 7B, 7C > 7D, 7A > 7C. In this case, the end on the leg opening 13 side of the overlapping position is specified as the end of the inner layer elastic body 72 indicated by the short distance 7A on the leg opening 13 side. The end on the waist opening 12 side of the overlapping position is specified as the end of the inner layer elastic body 72 indicated by the long distance 7C on the waist opening 12 side. The range sandwiched between these both ends, that is, the range obtained by subtracting the distance 7C from the distance 7A, is defined as the range in the body length direction Y of the overlapping portion 4. In the mode shown in FIG. 6, regarding the above various distances, the relationship is 7A > 7B, 7C > 7D, 7B > 7C. In this case, the end on the leg opening 13 side of the overlapping position is specified as the end of the outer layer elastic body 71 indicated by the short distance 7B on the leg opening 13 side. The end on the waist opening 12 side of the overlapping position is specified as the end of the inner layer elastic body 72 indicated by the long distance 7C on the waist opening 12 side. The range sandwiched between these both ends, that is, the range obtained by subtracting the distance 7C from the distance 7B, is defined as the range in the body length direction Y of the overlapping portion 4. In the embodiment shown in FIG. 7, with respect to the various distances described above, the relationships are 7A < 7B, 7C < 7D, and 7A > 7D. In this case, the end on the leg opening 13 side at the overlapping position is specified as the end on the leg opening 13 side of the inner elastic body 72 indicated by the short distance 7A. The end on the waist opening 12 side at the overlapping position is specified as the end on the waist opening 12 side of the outer elastic body 71 indicated by the long distance 7D. The range sandwiched between these two ends, that is, the range obtained by subtracting the distance 7D from the distance 7A, is defined as the range in the body length direction Y of the overlapping portion 4. In the embodiment shown in FIG. 8, with respect to the various distances described above, the relationships are 7A > 7B, 7C < 7D, and 7B > 7D. In this case, the end on the leg opening 13 side at the overlapping position is specified as the end on the leg opening 13 side of the outer elastic body 71 indicated by the short distance 7B. The end on the waist opening 12 side at the overlapping position is specified as the end on the waist opening 12 side of the outer elastic body 71 indicated by the long distance 7D. The range sandwiched between these two ends, that is, the range obtained by subtracting the distance 7D from the distance 7B, is defined as the range in the body length direction Y of the overlapping portion 4. As in the embodiment shown in FIG. 14 described later, when the inner elastic body 72 intersects at least partially with the extending direction of the outer elastic body 71 and has an extending direction that descends toward the crotch portion 10C side, the overlapping portion 4 is defined by the above method at each point in the waist circumferential direction X. Also, when a stretchable sheet is used, the range in the body length direction Y of the overlapping portion 4 is determined based on the above method by the ends on the leg opening 13 side and the ends on the waist opening 12 side on the sheet surface of the stretchable sheet. Further, when the stretchable sheet is used together with the above elastic body, the range in the body length direction Y of the overlapping portion 4 is determined based on the above method by combining both.

[0022] The shrinkage ratio of the inner elastic body 72 in the waist circumferential direction X is made larger than the shrinkage ratio of the outer elastic body 71 in the waist circumferential direction X. That is, the overlapping portion 4 in the region 3 has a stronger contraction force on the skin side than on the non-skin side.

[0023] In the overlapping portion 4 of the region 3 configured as described above, as shown in FIG. 11(B) starting from the state shown in FIG. 11(A), the inner layer sheet 63 side is more strongly pulled naturally and is more likely to bend compared to the outer layer sheet 61 side. That is, the contraction force (arrow V2-V2) of the inner layer elastic body 72 is stronger than the contraction force (V1-V1) of the outer layer elastic body 71, and a contraction difference occurs between the front and back of the middle layer sheet 62, that is, between the skin side surface and the non-skin side surface. As a result, in the back outer package 22, the skin side surface of the region 3 contracts inward (skin side) in the waist circumference direction X. Then, the back outer package 22 at the position of the overlapping portion 4 becomes concave and rounded with respect to the wearer W's skin over the entire waist circumference direction X, so-called curling occurs (arrow J). Along with this, the crotch side extension 8 connected to the overlapping portion 4 also curls inward along the wearer's buttocks. As a result, in the worn state of the diaper 10, the overlapping portion 4 of the back outer package 22 and the crotch side extension 8 connected to the lower side thereof wrap around the part below the wearer W's back waist circumference, particularly the buttocks, along the roundness of the body over the entire width between the left and right side seal portions 11. Thereby, the gap between the diaper 10 and the buttocks and its periphery is suppressed to be small according to the wearer's body shape. And on the surface sheet 14 of the absorbent main body 1 arranged inside the diaper 10, the flow of excrement such as feces and urine in the region from the crotch part 10C to the back part 10R is more effectively suppressed, and the absorption performance by the absorber 16 is improved. Along with this, leakage of excrement from the waist opening 12 in the back part 10R of the diaper 10 can be more effectively prevented. Note that the arrangement position of the overlapping portion 4 is not limited to the vicinity of the side seal portion 11 in the waist circumference direction X of the region 3. As long as the above-described contraction difference is preferably exhibited in the region 3, the overlapping portion 4 may be, for example, closer to the center than the vicinity of the side seal portion 11 in the waist circumference direction X, or may be over the entire region 3.

[0024] From the viewpoint of more favorably exhibiting the above-described action, the difference (R2-R1) between the contraction magnification (R2) of the inner layer elastic body 72 in the waist circumference direction X and the contraction magnification (R1) of the outer layer elastic body 71 in the waist circumference direction X is preferably 0.2 or more, more preferably 1.0 or more, and still more preferably 1.4 or more. Further, from the viewpoint of suppressing excessive curling of the overlapping portion 4 and the inner side (skin side) of the pleat portion 81, for example, inward curling and maintaining the appearance, the difference (R2 - R1) is preferably 3.5 or less, more preferably 3.0 or less, and even more preferably 2.5 or less.

[0025] (Method for Measuring Shrinkage Ratio) (1) Break the side seal portion of the absorbent article to be measured, and in the state where it is stretched to the maximum, for the elastomer in this state, use an oil-based pen to make two marks at regular intervals L1 in the waist circumferential direction X of the elastomer. If the components contained in the oil-based pen cause the elastomer to be plasticized or cut, instead of the oil-based pen, use an aqueous pen or a chaco pen to make two marks. Next, cut out the elastomer between the two marks. The interval L1 can be appropriately set according to the size of the article, and can be, for example, 100 mm. When the elastomer has an extending direction intersecting the waist circumferential direction X as shown in the embodiment of FIG. 14 described later, the interval L1 may be specified by tracing with an overhead projector or the like and making marks. In the waist circumferential direction X of the overlapping portion 4, when there is a portion where the contraction force is not developed by cutting the elastomer at the portion where the elastomer overlaps the absorber 16, make marks so that such a region is not included in the above interval L1. (2) Shrinkage Ratio of the Elastomer Itself Remove the bonding between the layers (middle layer sheet 62 - outer layer sheet 61, middle layer sheet 62 - inner layer sheet 63). When the bonding is made by heat fusion or pressure bonding, remove it so that each elastomer is not cut. When the bonding is made by an adhesive such as a hot melt type, remove only each elastomer while immersing it in a 90% or more ethanol solution. Measure the length L2 of each cut-out elastomer in the non-extended state (state where no external force for stretching is applied). This measurement is performed three times for each elastomer, and the shrinkage ratio is obtained by the arithmetic mean value of the values calculated by the formula represented by "L1 / L2". Further, when a stretchable sheet is used, measure the length L2 of each cut-out stretchable sheet in the non-extended state, and obtain the shrinkage ratio by the same method as above. (3) Shrinkage Ratio in the Waist Circumferential Direction X (3-1) When each elastic body is arranged parallel to the waist circumference direction X, the shrinkage ratio measured in (1) above is defined as the shrinkage ratio in the waist circumference direction X. The same applies to the stretchable sheet. (3-2) When each elastic body is not parallel to the waist circumference direction X, the shrinkage ratio measured in (1) above is along the extending direction of each elastic body, and it is decomposed into the waist circumference direction X and the body length direction Y to calculate the shrinkage ratio in the waist circumference direction X. For example, when the inner elastic body 72 extends as shown in FIGS. 9(A) and (B) and FIG. 10, the shrinkage ratio in the waist circumference direction X is calculated as follows. In FIGS. 9(A) and (B) and FIG. 10 to be described later, the inner elastic body 72 is shown as having an extending direction intersecting the waist circumference direction X as in the embodiment shown in FIG. 14 to be described later. However, it is not limited thereto, and the shrinkage ratio in the waist circumference direction X can be measured in the same manner even when an elastic member other than the inner elastic body 72 is not parallel to the waist circumference direction X. (i) When the end on the side seal portion 11 side of the inner elastic body 72 overlaps with the overlapping portion 4 as shown in FIGS. 9(A) and (B), various intersections 72A, 72B, and 72C related to the inner elastic body 72 are specified as follows. The intersection 72A is the intersection of the inner elastic body 72 with the inner edge of the side seal portion 11 inside the diaper. The intersection 72B is the point where the inner elastic body 72 extends from the intersection 72A and first intersects the edge of the overlapping portion 4 (the edge on the waist opening 12 side or the edge on the leg opening 13 side). The "first intersecting point" means, for example, as shown in FIG. 9(B), when the inner elastic body 72 extends in a meandering manner (e.g., in a trajectory like a sin curve) from the intersection 72A and intersects the edge of the overlapping portion 4 at a plurality of points, the first intersecting point is defined as the intersection 72B. The intersection 72C is the point obtained by moving the intersection 72B parallel to the waist circumference direction X and intersecting the inner edge of the side seal portion 11 inside the diaper. Based on the straight-line distance 72AB between the intersections 72A - 72B, the straight-line distance 72CB between the intersections 72C - 72B, and the shrinkage ratio (M) of the inner elastic body 72 itself measured in (1) above, the shrinkage ratio in the waist circumference direction X is calculated according to the following formula (I). Shrinkage ratio in the waist circumferential direction X = M × (72CB / 72AB) (I) (ii) When the elastic body vertically cuts through the overlapping portion 4 as shown in FIG. 10, various intersection points 72D, 72E, and 72F related to the inner elastic body 72 are specified as follows. The intersection point 72D is the point where the inner elastic body 72 starts from the side seal portion 11 and first intersects with the edge of the overlapping portion (the edge on the waist opening 12 side or the edge on the leg opening 13 side). The "first intersection point" means, as described above, when the inner elastic body 72 extends in a meandering manner (e.g., meandering along a trajectory like a sin curve) from the intersection point 72D and intersects with the edge of the overlapping portion 4 at multiple points, the first intersection point is defined as the intersection point 72D. The intersection point 72E is the point where the inner elastic body 72 secondarily intersects with the edge of the overlapping portion 4 (the edge on the waist opening 12 side or the edge on the leg opening 13 side). The intersection point 72F is the point where the trajectory obtained by moving the intersection point 72E parallel to the side seal portion 11 side along the waist circumferential direction X intersects with the trajectory obtained by vertically cutting through the overlapping portion 4 with the intersection point 72D along the body height direction Y. Based on the linear distance 72DE between the intersection points 72D - 72E, the linear distance 72FE between the intersection points 72F - 72E, and the shrinkage ratio (M) of the inner elastic body 72 itself measured in the above (1), the shrinkage ratio in the waist circumferential direction X is calculated according to the following formula (II). Shrinkage ratio in the waist circumferential direction X = M × (72FE / 72DE) (II)

[0026] In the above-described laminated structure of the overlapping portion 4, the configuration of the outer layer portion may be a stretchable outer layer sheet that constitutes the outer surface on the non-skin side, instead of the combination of the outer layer sheet 61 and the outer elastic body 71. In this case, the aforementioned non-skin side elastic region includes the stretchable outer layer sheet. Similarly, the configuration of the inner layer portion may be a stretchable inner layer sheet that constitutes the inner surface on the skin side, instead of the combination of the inner layer sheet 63 and the inner elastic body 72. In this case, the aforementioned skin side elastic region includes the stretchable inner layer sheet. In this case, the elasticity in the skin-side elastic region and the non-skin-side elastic region of the dorsal exterior body 22 may be a combination of the stretchable outer layer sheet and the stretchable inner layer sheet, may be a combination of the stretchable outer layer sheet and the inner elastic body 62, or may be a combination of the outer elastic body 71 and the stretchable inner layer sheet.

[0027] In the present embodiment, the overlapping portion 4 in the dorsal portion 10R and the femoral-side extension portion 8 of the femoral lower portion 10C are continuously formed by a partial sheet structure of the dorsal exterior body 22. However, the present invention is not limited to this form, and the overlapping portion 4 and the femoral-side extension portion 8 may be formed of separate members and joined together. However, from the viewpoint of more effectively causing the above-described outward warping action, it is preferably formed by a continuous sheet structure. Further, from the viewpoint of more effectively causing the above-described curling action, the femoral-side extension portion 8 preferably has a shrinkage magnification larger than the elasticity on the non-skin side of the overlapping portion 4. For example, as shown in FIG. 4, the femoral-side extension portion 8 preferably comprises an extension portion of the middle layer sheet 62, the inner layer sheet 63, and the inner elastic body 72. Further, when the configuration of the inner layer portion is composed of the stretchable inner layer sheet instead of the inner layer sheet 63 and the inner elastic body 72, the femoral-side extension portion 8 preferably comprises an extension portion of the stretchable inner layer sheet and the middle layer sheet 62 or an extension portion of the stretchable inner layer sheet.

[0028] In the present embodiment, the dorsal exterior body 22 has a waist-around portion 221 above the overlapping portion 4 and a waist-around portion 222 above the waist-around portion 221. As shown in FIG. 4, the waist-around portion 221 and the waist-around portion 222 preferably have a laminated structure of the outer layer sheet 61, the middle layer sheet 62, and an elastic body. In the waist-around portion 221, a plurality of stretchable waist-around elastic bodies 73, which form a part of the outer elastic body 71 described above, are arranged along the outer elastic body 71 of the overlapping portion 4. That is, the waist-around elastic body 73 extends in the waist-around direction X and is joined and fixed in an extended state while being interposed between the outer layer sheet 61 and the middle layer sheet 62. In the waist-around portion 222, a plurality of stretchable waist-around elastic bodies 74 are arranged along the waist-around elastic body 73. In the waist-around portion 222, the outer layer sheet 61 and the middle layer sheet 62 are folded toward the skin side at the waist opening 12 to form a folded-back portion 23. The waist-around elastic body 74 extends in the waist-around direction X, and is interposed between the opposing middle layer sheets 62, 62 in the region where the folded-back portion 23 of the waist-around portion 222 is arranged, and is joined and fixed in an extended state. Further, the edge of the middle layer sheet 62 constituting the folded-back portion 23 clamps the upper edge of the absorbent body 1 and covers the end portion of the absorbent body 1 in the longitudinal direction Y. On the other hand, in the ventral exterior body 21 as well, it is preferable to use the outer layer sheet 61, the middle layer sheet 62, and the inner layer sheet 63 to have a laminated structure similar to that of the dorsal exterior body 22 except for the overlapping portion 4. Thereby, for the waist-around and hip-around of the wearer, good fit due to the expansion and contraction of the dorsal exterior body 22 and the ventral exterior body 21 can be obtained. As something that can obtain the same fit, instead of the configuration of the outer layer sheet 61, the hip-around elastic body 73, and the waist-around elastic body 74, the aforementioned stretchable outer layer sheet may be used.

[0029] In the diaper 10 of the present embodiment, the adhesion length of each of the outer layer elastic body 71 and the inner elastic body 72 to the middle layer sheet 62 in the overlapping portion 4 is preferably as follows. That is, in the overlapping portion 4, the adhesion length (H1) of the outer layer elastic body 71 to the middle layer sheet 62 in the waist-around direction X is preferably shorter than the adhesion length (H2) of the inner elastic body 72 to the middle layer sheet 62 in the waist-around direction X. Thereby, the contraction force of the inner elastic body 72 is more likely to be strongly transmitted by the middle layer sheet 62 or the like, and a larger contraction difference occurs between the front and back of the middle layer sheet 62, that is, between the skin side surface and the non-skin side surface, and it is more likely to curl inward (skin side) more naturally. From the above viewpoints, the difference (H2 - H1) in the adhesion length is preferably 0.10 mm / mm or more, more preferably 0.65 mm / mm or more, and still more preferably 0.75 mm / mm or more as the difference in the adhesion length per 1 mm of the elastic body. Further, from the viewpoint of preventing the adhesion of the outer elastic body 71 from peeling off as the overlapping portion 4 contracts, the difference (H2 - H1) in the adhesion length is preferably 0.95 mm / mm or less, more preferably 0.90 mm / mm or less, and even more preferably 0.85 mm / mm or less.

[0030] (Method for measuring the adhesion length) (1) Measure the predetermined length of the elastic body arranged in the overlapping portion 4 in the non - stretched state and mark both ends thereof. The predetermined length can be appropriately set according to the size of the article, and can be, for example, 100 mm. (2) Measure the length along the length direction of the elastic body of the adhesive portion existing between the marks as follows. When the adhesive portions are continuous, the length of the elastic body between the marks is taken as the length of the adhesive. When the adhesives are intermittent, the total value of the lengths along the length direction of the elastic body of the portions where the adhesives exist is taken as the length of the adhesive. For example, in the case of a spiral coating of a hot - melt type adhesive, measure the width of one spiral at 5 places with a microscope, take the average value as the width of the spiral, and multiply it by the number of spiral lines overlapping the elastic body to obtain the adhesion length. (3) The value obtained by dividing the length of the adhesive measured in (2) by the predetermined length measured in (1) is taken as the adhesion length per 1 mm of the elastic body. In addition, when the coated portion of the adhesive cannot be visually judged, a colored toner such as black (for example, product name "Refill Toner Powder Bottle 560971 for Laser Printer" manufactured by Brother Industries, Ltd.) is sprayed on the surface of the elastic body to color the adhesive adhering to the surface of the elastic body. Then, perform an operation to blow it off with air or remove the excess toner with a vacuum cleaner so that only the toner of the adhesive portion can be visually seen, and then perform the above measurement.

[0031] From the same perspective as the above-described configuration of the adhesion length, in the overlapping portion 4, the ratio (R2 / R1) of the shrinkage ratio (R2) of the inner elastic body 72 in the waist circumferential direction X to the shrinkage ratio (R1) of the outer elastic body 71 in the waist circumferential direction X is preferably greater than the ratio (H2 / H1) of the adhesion length (H2) of the inner elastic body 72 to the middle sheet 62 in the waist circumferential direction X to the adhesion length (H1) of the outer elastic body 71 to the middle sheet 62 in the waist circumferential direction X. Specifically, the difference between the value of the ratio (R2 / R1) and the value of the ratio (H2 / H1) is preferably 0.5 or more, more preferably 1.0 or more, and still more preferably 1.5 or more. Also, the difference between the value of the ratio (R2 / R1) and the value of the ratio (H2 / H1) is preferably 3.0 or less, more preferably 2.5 or less, and still more preferably 2.0 or less.

[0032] Furthermore, in the overlapping portion 4, it is preferable that the inner elastic body 72 and the middle sheet 62 are continuously adhered in the waist circumferential direction X. Also, in the overlapping portion 4, it is preferable that the outer elastic body 71 and the middle sheet 62 are adhered by an adhesive layer arranged in a spiral pattern. With such a configuration, the shrinkage force of the inner elastic body 72 is more likely to be transmitted to the middle sheet 62, while the outer elastic body 71 suppresses the propagation of the shrinkage force to the middle sheet 62 by intermittent adhesion. As a result, the above-described shrinkage difference is more likely to be strongly manifested.

[0033] Moreover, the difference (R2 - R1) between the shrinkage ratio (R2) of the inner elastic body 72 in the waist circumferential direction X and the shrinkage ratio (R1) of the outer elastic body 71 in the waist circumferential direction X is preferably greater than the difference (H2 - H1) between the adhesion length (H2) of the inner elastic body 72 to the middle sheet 62 in the waist circumferential direction X and the adhesion length (H1) of the outer elastic body 71 to the middle sheet 62 in the waist circumferential direction X. With such a configuration, it becomes possible to generate curl caused by the shrinkage force difference between the two elastic bodies 71 and 72 in the middle sheet 62 without waste. From the above viewpoints, the difference between the value of the shrinkage ratio difference (R2 - R1) and the value of the adhesion length difference (H2 - H1) is preferably 0.10 or more, more preferably 0.30 or more, and even more preferably 0.45 or more. Also, from the viewpoint of achieving both the adhesiveness of the inner elastic body 72 and the ease of transmitting the shrinkage force difference between the two elastic bodies 71 and 72 to the intermediate sheet, the difference between the value of the shrinkage ratio difference (R2 - R1) and the value of the adhesion length difference (H2 - H1) is preferably 3.50 or less, more preferably 2.00 or less, and even more preferably 1.50 or less.

[0034] Furthermore, in the edge region of the side seal portion 11, the ratio (S2) of the length in the body length direction Y of the region where the inner elastic body 72 exists to the length in the body length direction Y of the side seal portion 11 is preferably longer than the ratio (S1) of the length in the body length direction Y of the region where the outer elastic body 71 exists to the length in the body length direction Y of the side seal portion 11. Here, the "edge region of the side seal portion 11" is defined as the region 10 mm from the inner edge of the side seal portion 11. Also, the outer elastic body 71 mentioned here includes the waist elastic body 73 described above. With such a configuration, the shrinkage by the inner elastic body 72 can be concentrated in a specific range. Thereby, curl can be generated in a selective range only on the buttocks side behind the crotch portion 10C. Also, thereby, excessive collapse of the shape of the diaper 10 can be suppressed, and the gap between the body and the entire diaper 10 can be preferably suppressed. From the above viewpoints, the difference (S2 - S1) between the width (S2) in the body length direction Y of the region where the inner elastic body 72 exists and the ratio (S1) of the length in the body length direction Y of the region where the outer elastic body 71 exists to the length in the body length direction Y of the side seal portion 11 is preferably 0.05 mm / mm or more, more preferably 0.10 mm / mm or more, and even more preferably 0.15 mm / mm or more. Also, from the viewpoint of generating a visible curl, the difference (S2 - S1) is preferably 1.00 mm / mm or less, more preferably 0.70 mm / mm or less, and even more preferably 0.55 mm / mm or less.

[0035] Further, as shown in FIG. 4, in the region on the waist opening 12 side from the overlapping portion 4, an extensible waist elastic body 73 is arranged along the waist circumferential direction X, and the waist elastic body 73 is preferably interposed between the outer layer sheet 61 and the middle layer sheet 62 and joined and fixed in an extended state. The shrinkage ratio (R3) of the waist elastic body 73 in the waist circumferential direction X is preferably smaller than the shrinkage ratio (R2) of the inner layer elastic body 72 in the waist circumferential direction X in the overlapping portion 4, and smaller than the shrinkage ratio (R1) of the outer layer elastic body 71 in the waist circumferential direction X in the overlapping portion 4. Note that the waist elastic body 73 is in the same layer as the outer layer elastic body 71 and can be said to constitute a part of the outer layer elastic body 71. When the waist elastic body 73 and the outer layer elastic body 71 are distinguished, the outer layer elastic body 71 means the one in the overlapping portion 4. With such a configuration, on the non-skin side of the middle layer sheet 62, a difference in shrinkage also occurs in the waist portion 221 continuous with the upper part of the overlapping portion 4, assisting the curling of the overlapping portion 4. From the above viewpoints, the difference (R2 - R3) between the shrinkage ratio (R2) of the inner layer elastic body 72 and the shrinkage ratio (R3) of the waist elastic body 73 is preferably 0.1 or more, more preferably 0.40 or more, and still more preferably 0.90 or more. Also, from the viewpoint of suppressing excessive warping of the overlapping portion 4 and the rear side (back side) of the pleat portion 81, for example, curling to the outside and maintaining the appearance, the difference (R2 - R3) is preferably 2.60 or less, more preferably 2.10 or less, and still more preferably 1.70 or less. In addition, from the above viewpoints, the difference (R1 - R3) between the shrinkage ratio (R1) of the outer layer elastic body 71 and the shrinkage ratio (R3) of the waist elastic body 73 in the overlapping portion 4 is preferably 0.10 or more, more preferably 0.50 or more, and still more preferably 1.00 or more. Also, from the viewpoint of suppressing the strain at the interface between the outer layer elastic body 71 and the waist elastic body 73 on the waist opening 12 side in the overlapping portion 4 due to the difference in the shrinkage ratio and maintaining the appearance, the difference (R1 - R3) is preferably 2.50 or less, more preferably 2.00 or less, and still more preferably 1.00 or less.

[0036] Furthermore, as described above, it is preferable that the inner elastic body 72 is a filament such as yarn rubber, and the basis weight (M2) of the middle layer sheet 62 is higher than the basis weight (M1) of the inner layer sheet 63. Further, it is preferable that the middle layer sheet 62 has a higher nonwoven bulk softness than the inner layer sheet 63. With such a configuration, there is a difference in the rigidity of the nonwoven fabric, and the above-mentioned curling inward through the middle layer sheet 62 is more likely to occur effectively. From the above viewpoints, the difference (M2 - M1) between the basis weight (M2) of the middle layer sheet 62 and the basis weight (M1) of the inner layer sheet 63 is preferably 2 g / m 2 or more, more preferably 5 g / m 2 or more, and still more preferably 8 g / m 2 or more. Also, from the viewpoint of preventing the generation of wrinkles due to laminating nonwoven fabrics with different rigidities, the difference (M2 - M1) is preferably 35 g / m 2 or less, more preferably 20 g / m 2 or less, and still more preferably 15 g / m 2 or less. Furthermore, from the above viewpoints, the difference (B2 - B1) between the nonwoven bulk softness (B2) of the middle layer sheet 62 and the nonwoven bulk softness (B1) of the inner layer sheet 63 is preferably 0.5 cN or more, more preferably 1.0 cN or more, and still more preferably 1.5 cN or more. Also, from the viewpoint of preventing the generation of wrinkles due to laminating nonwoven fabrics with different rigidities, the difference (B2 - B1) is preferably 4.0 cN or less, more preferably 3.0 cN or less, and still more preferably 2.5 cN or less. Note that the above-mentioned relationship between the basis weight and the nonwoven bulk softness between the middle layer sheet 62 and the inner layer sheet 63 is preferably satisfied at least in the overlapping portion 4.

[0037] (Method for measuring nonwoven bulk softness) At 22°C and 65% RH, cut out 150 mm in the waist circumference direction X and 30 mm in the body length direction Y from each of the non-woven fabrics of the middle layer sheet 62 and the inner layer sheet 63, and use this as a measurement piece. Using a stapler, fix the ends at two places above and below so that this measurement piece becomes a ring shape with a diameter of 45 mm. At this time, the core of the stapler should be made longer in the CD direction. Next, using a tensile testing machine (for example, the Tensilon tensile testing machine "RTA-100" manufactured by Orientec Co., Ltd.), stand the ring-shaped measurement piece upright on the sample table in a cylindrical shape, and measure the maximum load when compressing it from above with a flat plate almost parallel to the table at a compression speed of 10 mm / min. Perform this measurement for any three places cut out from each of the middle layer sheet 62 and the inner layer sheet 63, and use the average value of these as the bulk softness. When cutting out the measurement piece from the overlapping part 4, the range in the body length direction Y is specified based on (the method of defining the range in the body length direction Y of the overlapping part 4).

[0038] Also, in the overlapping part 4, it is preferable to make the outer layer elastic body 71 and the inner layer elastic body 72 as follows. That is, in the overlapping part 4, it is preferable that the inner layer elastic body 72 has a greater number per body length than the outer layer elastic body 71. In the overlapping part 4, it is preferable that the inner layer elastic body 72 is a thicker filament than the outer layer elastic body 71. In the overlapping part 4, it is preferable that the arrangement pitch of the inner layer elastic body 72 is smaller than the arrangement pitch of the outer layer elastic body 71. With such a configuration, in the overlapping part 4, it becomes easier to create a difference in contraction force between the outer layer elastic body 71 and the inner layer elastic body 72, and the action of curling inward described above is more likely to occur effectively. From the above viewpoints, in the overlapping part 4, the difference (E2 - E1) between the number of the inner layer elastic body 72 per body length (E2) and the number of the outer layer elastic body 71 per body length (E1) is preferably 1 or more, more preferably 2 or more, and even more preferably 3 or more. Also, in the overlapping part 4, the difference (E2 - E1) is preferably 15 or less, more preferably 12 or less, and even more preferably 10 or less. In addition, from the above viewpoints, in the overlapping portion 4, the difference (F2 - F1) between the thickness (F2) of the inner elastic body 72 and the thickness (F1) of the outer elastic body 71 is preferably 130 dtex or more, more preferably 290 dtex or more. Also, in the overlapping portion 4, the difference (F2 - F1) is preferably 600 dtex or less from the viewpoint of preventing deterioration of the appearance due to wrinkles caused by a large difference in the thickness of the elastic body. Furthermore, in the overlapping portion 4, the difference (P1 - P2) between the arrangement pitch (P1) of the outer elastic body 71 and the arrangement pitch (P2) of the inner elastic body 72 is preferably 1.0 mm or more, more preferably 3.0 mm or more, and still more preferably 5.0 mm or more. Also, in the overlapping portion 4, the difference (P1 - P2) is preferably 20 mm or less, more preferably 15 mm or less, and still more preferably 10 mm or less from the viewpoint of preventing deterioration of the appearance due to wrinkles caused by a large difference in the pitch.

[0039] Furthermore, as shown in FIG. 13, the inner sheet 63 preferably extends toward the waist opening 12 side from the overlapping portion 4 and has a region 65 that does not overlap with the inner elastic body 72 in the thickness direction. By arranging such a region 65, even if there is no inner elastic body 72 in the region 65, the contraction force of the inner elastic body 72 can be transmitted to the middle sheet 62 through the region 65. Thereby, also there, curling toward the inside (skin side) is slightly more likely to occur due to the waist elastic body 73 and the region 65, and curling toward the inside (skin side) of the overlapping portion 4 can be assisted.

[0040] Also, the arrangement of the outer elastic body 71 and the inner elastic body 72 in the planar direction can take various forms that can effectively exhibit the action in the overlapping portion 4 described above. For example, the embodiments shown in FIGS. 12 and 13, the embodiment shown in FIG. 14, etc. are mentioned. Hereinafter, these will be described.

[0041] In the embodiments shown in FIGS. 12 and 13, a plurality of inner elastic bodies 72 are arranged from the overlapping portion 4 to the region extending toward the lower crotch portion 10C side from the overlapping portion 4. The region extending toward the lower crotch portion 10C side is the region of the crotch side extension portion 8 described above. The inner elastic body 72 is interposed between the inner layer sheet 63 and the middle layer sheet 62 in the overlapping portion 4 and the crotch side extension portion 8 and is joined and fixed in an extended state. In the joined and fixed state, the inner elastic body 72 extends along the waist circumferential direction X, and a plurality of them are arranged in parallel with each other. In the overlapping portion 4, the inner elastic body 72 extends in the waist circumferential direction X while both ends thereof are joined and fixed to the left and right side seal portions 11, 11, and is joined and fixed between the sheets. The inner elastic bodies 72 arranged in parallel are spaced apart at equal intervals in the body length direction Y. In the crotch side extension portion 8 which is a region extending toward the lower crotch portion 10C side, the inner elastic body 72 does not overlap the outer elastic body 71 in the thickness direction. On the other hand, a plurality of outer elastic bodies 71 extend along the waist circumferential direction X so as to connect the left and right side seal portions 11, 11 in the same manner as described above. The plurality of outer elastic bodies 71 are arranged in parallel while being spaced apart from each other at equal intervals in the body length direction Y. With such a configuration, the inward curl in the overlapping portion 4 is more likely to be better propagated to the crotch side extension portion 8 where the inner elastic body 72 is present.

[0042] In the embodiment shown in FIG. 14, the outer elastic body 71 extends along the waist circumferential direction X as described above, and a plurality of them are arranged in parallel with each other. On the other hand, the inner elastic body 72 intersects at least partially with the extending direction of the outer elastic body 71 and has an extending direction that descends toward the lower crotch portion 10C side, and a plurality of them are arranged in parallel with each other. In such an arrangement, in a plan view of the overlapping portion 4, there is an intersection portion 75 between the outer elastic body 71 and the inner elastic body 72 at a portion where the inner elastic body 72 extends from the side seal portion 11 and starts to descend toward the lower crotch portion 10C side. This intersection portion 75 forms the overlapping portion 4 and is formed in the vicinity of the side seal portion 11. In this intersection portion 75, the stretching direction on the skin side has an angle with respect to the stretching direction on the non-skin side (waist circumferential direction X) with the middle layer sheet 62 interposed therebetween. The outer elastic body 71 and the inner elastic body 72 are arranged at positions as shown in, for example, the enlarged schematic view shown in FIG. 15 in the vicinity of the side seal portion 11.

[0043] At this intersection 75, as shown in FIG. 15, in the extending direction of the outer elastic body 71, that is, in the waist circumferential direction X, the points (intersection points) where the outer elastic body 71 intersects the inner elastic body 72 are more numerous on the leg opening 13 side than on the waist opening 12 side. In the example shown in FIG. 15, in the outer elastic body 71 closest to the waist opening 12 side of the overlapping portion 75 (overlapping portion 4), there is one intersection point 77 with the inner elastic body 72. In contrast, in the outer elastic body 71 closest to the leg opening 13 side of the overlapping portion 75 (overlapping portion 4), there are three intersection points 77 with the inner elastic body 72, and the number of intersection points 77 is larger on the leg opening 13 side than on the waist opening 12 side. The points where the outer elastic body 71 intersects the inner elastic body 72 in this way become the bending points of the sheet laminate including the middle sheet 62 in the overlapping portion 4. At this bending point, curling inward of the overlapping portion 4 due to the difference in the contraction force described above is likely to occur. By arranging such bending points more on the leg opening 13 side near the side seal portion 11, curling inward of the thigh side extension 8 is also effectively likely to occur around the leg opening 13 of the crotch portion 10C. In addition, at the intersection point 77, the vector in which the contraction force acts of the inner elastic body 72 is changed to the crotch portion 10C side with respect to the outer elastic body 71. The inner elastic body 72 can more effectively transmit a relatively strong contraction force to the thigh side extension 8.

[0044] Further, in the embodiment shown in FIG. 14, as shown in FIG. 15, it is preferable that the outer elastic body 71 and the middle sheet 62 are intermittently adhered by a plurality of adhesive layers 91 extending in the body length direction Y and intermittently arranged in the waist circumferential direction X. Also, it is preferable that the inner elastic body 72 and the middle sheet 62 are continuously adhered in the waist circumferential direction X by an adhesive layer 92 arranged along the inner elastic body 72. In the adhesion mode as described above, in the overlapping portion 4, the crossing angle formed by the outer elastic body 71 and the inner elastic body 72 is preferably smaller than the angle formed by the adhesive layer 91 that adheres the outer elastic body 71 and the middle sheet 62 and the adhesive layer 92 that adheres the inner elastic body 72 and the middle sheet 62. By adopting such a configuration, the difference in shrinkage force between the outer elastic body 71 and the inner elastic body 72 can be transmitted without waste. As a result, curling inward at the overlapping portion 4 and the crotch-side extension portion 8 becomes stronger and more likely to occur naturally. From the above viewpoints, at the overlapping portion 4, the difference (θ1 - θ2) between the angle (θ1) formed by the adhesive layer 91 and the adhesive layer 92 and the crossing angle (θ2) formed by the outer elastic body 71 and the inner elastic body 72 is preferably 10 degrees or more, more preferably 20 degrees or more, and even more preferably 30 degrees or more. Also, from the viewpoint of preventing wrinkles caused by an increase in the difference (θ1 - θ2) of the angles, the difference (θ1 - θ2) is preferably 80 degrees or less, more preferably 70 degrees or less, and even more preferably 60 degrees or less.

[0045] The adhesive layer 91 and the adhesive layer 92 can be formed by a method commonly used in this type of article. For example, the adhesive layer 91 can be formed by applying an adhesive such as a hot-melt adhesive in a spiral shape and in a strip shape with a predetermined width along the body length direction Y. The adhesive layer 92 can be formed by applying an adhesive such as a hot-melt adhesive over the entire length of the filamentous or cord-like outer elastic body 71 using a comb gun or the like. In addition, when the adhesive layer 91 has a shape that extends in the body length direction Y in a spiral and strip shape, there may be an error in the extending direction depending on the location due to the coating method. Therefore, when using this coating method, the aforementioned angle (θ1) is the average value of the values measured for three products.

[0046] Furthermore, in the embodiment shown in FIG. 14, it is preferable that the inner elastic body 72 extends while overlapping the outer elastic body 71 in the thickness direction at the overlapping portion 4 and curving inward in the waist circumference direction X and descending toward the crotch lower portion 10C side. At the crotch lower portion 10C, it is preferable that the inner elastic body 72 extends so as to overlap the absorbent main body 1 included in the crotch lower portion 10C, particularly the absorber 16, in the thickness direction. More specifically, it is preferable that the inner layer elastic body 72 extends in the waist circumferential direction X up to a predetermined range inward from the side seal portions 11, 11 while being joined and fixed at the left and right side seal portions 11, 11. From the middle thereof, the inner layer elastic body 72 preferably extends downward toward the crotch portion 10C and reaches the region of the crotch portion 10C so as to overlap the absorber 16 in the thickness direction. Thereby, the above-described action is more likely to be effectively exhibited.

[0047] In the diaper 10 of the present embodiment, the ventral outer cover 21 disposed on the ventral side portion 10F is joined to the dorsal outer cover 22 at both left and right side edges by side seal portions as described above. As shown in FIG. 16, the ventral outer cover 21 preferably has the same configuration as the portion excluding the overlapping portion 4 of the dorsal outer cover 22. Specifically, it is preferable to form the waist circumferential portion 211 and the waist surrounding portion 212 of the ventral outer cover 21 using the outer layer sheet 61, the middle layer sheet 62, the inner layer sheet 63, the waist circumferential elastic body 73, and the waist surrounding elastic body 74. In the waist surrounding portion 212, it is preferable that the folded-back portion 23 covers the ventral end portion of the absorbent main body 1. Further, in the portion 213 (hereinafter, also simply referred to as the portion 213) of the ventral outer cover 21 joined via the overlapping portion 4 of the dorsal outer cover 22 and the side seal portion 11, it is preferable that the number of elastic bodies is smaller than the number of elastic bodies disposed in the overlapping portion 4 of the dorsal side portion 10R. By adopting such a configuration, the portion 213 of the ventral outer cover 21 has a weaker contraction force than the entire overlapping portion 4 of the dorsal outer cover 22, and the portion of the side seal portion 11 is also likely to curl inward. As a result, the entire waist circumferential direction X of the overlapping portion 4 and the thigh side extension portion 8 described above is preferably rounded along the body such as the buttocks.

[0048] Furthermore, as shown in FIG. 16, the portion 213 of the ventral outer cover 21 joined via the overlapping portion 4 of the dorsal outer cover 22 and the side seal portion 11 is preferably composed of the middle layer sheet 62 and the inner layer sheet 63 constituting the ventral outer cover 21. By adopting such a configuration, the portion 213 of the ventral exterior body 21 has lower rigidity than the overlapping portion 4 of the dorsal exterior body 22, and the portion of the side seal portion 11 is more likely to curl inward. As a result, the actions of the aforementioned overlapping portion 4 and the crotch side extension portion 8 are more likely to occur effectively.

[0049] In the diaper 10 of the present embodiment, in the overlapping portion 4, it is preferable that the outer elastic body 71 is a filamentous body, is sandwiched and joined between the outer sheet 61 and the middle sheet 62, and the outer sheet 61 is composed of a stretchable sheet. Further, the shrinkage magnification of the outer sheet 61 made of a stretchable sheet in the waist circumferential direction X is preferably smaller than the shrinkage magnification of the inner elastic body 72 in the waist circumferential direction X. In this way, using a stretchable sheet having a smaller shrinkage magnification than the inner elastic body 72 as the outer sheet 61 and disposing it on the outer elastic body 71 side of the overlapping portion 4 will reinforce the occurrence of curling of the aforementioned overlapping portion 4.

[0050] Also, in the overlapping portion 4, it is preferable that the outer elastic body 71 and the middle sheet 62 are not provided, and the outer sheet 61 is composed of a stretchable sheet. Further, the outer sheet 61 is intermittently joined to the inner sheet 63, and the inner elastic body 72 is preferably joined between the joints of the outer sheet 61 and the inner sheet 63 by a comb gun type adhesive layer. Thereby, an adhesive layer coated with an adhesive can be formed only on the portion where the filamentous or string-like inner elastic body 72 exists. By such an adhesive layer, the area of the joint portion between the outer sheet 61, which is a stretchable sheet, and the inner sheet 63 can be reduced at the arrangement position of the inner elastic body 72. In the above configuration, the joint portion between the inner sheet 63 and the inner elastic body 72 and the joint portion between the outer sheet 61 made of a stretchable sheet and the inner sheet 63 are less likely to overlap, and their respective shrinkage forces act separately on the inner layer. Therefore, the respective shrinkage forces can be transmitted to the inner sheet without interfering with each other.

[0051] Furthermore, in each of the above-described embodiments, an example in which the elastic body is formed of a filamentary body such as thread rubber has been described. However, instead of these filamentary bodies, an elastic sheet may be used. When configured with this elastic sheet, the outer layer sheet 61 and the inner layer sheet 63 can be configured with this elastic sheet. That is, the outer layer sheet 61 itself and the inner layer sheet 63 itself are made of a material that can be stretched, and each is provided with elasticity that causes contraction in the waist circumference direction, and can be configured to be joined to the middle layer sheet 62.

[0052] Each member constituting the pant-type diaper 10 can be formed using various ones used for this type of article. For example, as materials for the outer layer sheet 61, the middle layer sheet 62, and the inner layer sheet 63 constituting the outer package 2, for example, non-woven fabrics, woven fabrics, knitted fabrics, resin films, etc. by various manufacturing methods such as air-through non-woven fabric, heat roll non-woven fabric, spunlace non-woven fabric, spunbond non-woven fabric, meltblown non-woven fabric, etc. can be mentioned, and sheet materials formed by laminating and integrating these can also be used. Various materials can also be used for the materials. For example, synthetic fibers made of polyethylene, polypropylene, polyester, and other thermoplastic resins can be used. In particular, the inner layer sheet 63 is preferably made of a non-woven fabric from the viewpoint of improving breathability and texture, and is preferably made of a water-repellent non-woven fabric from the viewpoint of preventing leakage of excrement.

[0053] As the above-described various elastic body materials, ordinary elastic materials used for wearing articles such as diapers and sanitary napkins can be used. For example, as materials, synthetic rubbers such as styrene-butadiene, butadiene, isoprene, neoprene, natural rubber, EVA, stretchable polyolefin, polyurethane, etc. can be mentioned, and as forms, those having a rectangular, square, circular, polygonal, etc. cross-section in the form of a filament or a string (such as flat rubber), or multi-filament type filaments, etc. can be used. In addition, examples of the stretchable sheet include a sheet obtained by subjecting two fiber sheets sandwiching elastic filaments to a tooth groove stretching process, as described in paragraphs

[0012] to

[0085] of JP-A-2008-179128 and

[0013] to

[0051] of JP-A-2007-22066, a stretchable film as described in paragraph

[0079] of JP-A-2019-103889, a polyurethane film, and the like.

[0054] Moreover, materials usually used for this type of diaper can be used without particular limitation to form the absorbent body 1.

[0055] The pants-type wearable article of the present invention is not limited to the embodiment of the pants-type diaper 10 as described above, but is a concept including various articles having a pants-type structure. For example, the outer body 2 is not limited to a form in which the ventral outer body 21 and the dorsal outer body 22 described above are separated, and the outer body may be configured to cover the entire ventral part 10F, crotch part 10C, and dorsal part 10F. The pants-type wearable article of the present invention may be for infants or adults, and may be in a form other than a diaper. For example, as forms other than a diaper, it may be a sanitary shorts, a shorts-type napkin, a disposable shorts, or the like. Further, it is not limited to an article provided with an absorbent body like the pants-type diaper 10 described above, and may be a diaper cover or underwear without an absorbent body.

[0056] Regarding the above-described embodiments, the present invention further discloses the following pants-type wearable articles.

[0057] <1> A pants-type wearable article including a ventral part arranged on the ventral side of a wearer, a crotch part arranged on the crotch side, and a dorsal part arranged on the dorsal side, and having a waist circumference direction and a body length direction, The pants-type wearable article includes a waist opening arranged above the ventral part and the dorsal part in the body length direction, and a pair of leg openings arranged on the left and right of the crotch part. The dorsal outer body forming the outer surface body of the dorsal part has a skin-side elastic region and a non-skin-side elastic region that are provided with at least the elasticity necessary for expansion and contraction in the waist circumference direction on the skin side and the non-skin side of the dorsal outer body in the region on the leg opening side. The dorsal outer body has an elastic overlapping portion where the skin-side elastic region and the non-skin-side elastic region overlap each other in the thickness direction of the dorsal outer body. In this overlapping portion, the contraction magnification in the waist circumference direction of the skin-side elastic region is larger than the contraction magnification in the waist circumference direction of the non-skin-side elastic region. The dorsal outer body has a crotch-side extension connected to the overlapping portion as the outer surface body on the hip side of the lower crotch, which is a pants-type wearing article.

[0058] <2> The overlapping portion has a laminated structure including an outer layer portion, a middle layer portion, and an inner layer portion, which is arranged in the region on the leg opening side. The middle layer portion is a middle layer sheet made of a sheet material. In the overlapping portion, the inner layer portion includes the skin-side elastic region, the outer layer portion includes the non-skin-side elastic region, and the skin-side elastic region and the non-skin-side elastic region are in a position overlapping in the thickness direction of the dorsal outer body via the middle layer sheet. The pants-type wearing article according to <1>.

[0059] <3> The outer layer portion has an outer layer sheet made of a sheet material constituting the non-skin-side outer surface, and an outer layer elastic body that is interposed between the outer layer sheet and the middle layer sheet and is joined and fixed in an extendable manner. The outer layer elastic body is arranged with at least an extending direction along the waist circumference direction. The pants-type wearing article according to <2>, wherein the non-skin-side elastic region includes the outer layer elastic body. <4> The outer layer portion is a stretchable outer layer sheet that constitutes the non-skin-side outer surface. The pants-type wearing article according to <2>, wherein the non-skin-side elastic region includes the stretchable outer layer sheet.

[0060] <5> The inner layer portion includes an inner layer sheet made of a sheet material that forms the inner surface on the skin side, and an inner layer elastic body that is interposed between the inner layer sheet and the middle layer sheet and is joined and fixed in an extendable manner. The inner layer elastic body is arranged with at least an extending direction along the waist circumference direction. The pants-type wearable article according to any one of <2> to <4>, wherein the elastic region on the skin side includes the inner layer elastic body. <6> The inner layer portion is a stretchable inner layer sheet that forms the inner surface on the skin side. The pants-type wearable article according to any one of <2> to <4>, wherein the elastic region on the skin side includes the stretchable inner layer sheet.

[0061] <7> The outer layer portion includes an outer layer sheet made of a sheet material that forms the outer surface on the non-skin side, and an outer layer elastic body that is interposed between the outer layer sheet and the middle layer sheet and is joined and fixed in an extendable manner. The outer layer elastic body is arranged with at least an extending direction in the waist circumference direction. The non-skin side elastic region includes the outer layer elastic body. The inner layer portion includes an inner layer sheet made of a sheet material that forms the inner surface on the skin side, and an inner layer elastic body that is interposed between the inner layer sheet and the middle layer sheet and is joined and fixed in an extendable manner. The inner layer elastic body is arranged with at least an extending direction in the waist circumference direction. The elastic region on the skin side includes the inner layer elastic body. The outer layer elastic body and the inner layer elastic body are arranged at positions where they overlap in the thickness direction to form the overlapping portion. The pants-type wearable article according to <2>, wherein the shrinkage magnification of the inner layer elastic body in the waist circumference direction is larger than that of the outer layer elastic body in the waist circumference direction.

[0062] <8> In the overlapping portion, the adhesion length of the outer layer elastic body to the middle layer sheet in the waist circumference direction is shorter than the adhesion length of the inner layer elastic body to the middle layer sheet in the waist circumference direction. The pants-type wearable article according to <7>. <9> In the overlapping portion, the ratio of the shrinkage magnification of the inner elastic body in the waist circumferential direction to the shrinkage magnification of the outer elastic body in the waist circumferential direction is larger than the ratio of the adhesion length of the inner elastic body to the middle layer sheet in the waist circumferential direction to the adhesion length of the outer elastic body to the middle layer sheet in the waist circumferential direction. The pant-type wearing article according to <8>. <10> In the overlapping portion, the inner elastic body and the middle layer sheet are continuously adhered in the waist circumferential direction. The pant-type wearing article according to any one of <7> to <9>. <11> The outer elastic body and the middle layer sheet are adhered by an adhesive layer arranged in a spiral pattern. The pant-type wearing article according to any one of <7> to <10>. <12> The difference between the shrinkage magnification of the inner elastic body in the waist circumferential direction and the shrinkage magnification of the outer elastic body in the waist circumferential direction is larger than the difference between the adhesion length of the inner elastic body to the middle layer sheet in the waist circumferential direction and the adhesion length of the outer elastic body to the middle layer sheet in the waist circumferential direction. The pant-type wearing article according to any one of <7> to <11>.

[0063] <13> Side seal portions for joining both side edges of the ventral side portion and the dorsal side portion are provided. In the edge region of the side seal portion, the ratio of the length in the body length direction of the region where the inner elastic body exists to the length in the body length direction of the side seal portion is longer than the ratio of the length in the body length direction of the region where the outer elastic body exists to the length in the body length direction of the side seal portion. The pant-type wearing article according to any one of <7> to <12>. <14> In the region closer to the waist opening than the overlapping portion, an extendable waist elastic body is arranged along the waist circumferential direction. The waist elastic body is interposed between the outer sheet and the middle layer sheet and is joined and fixed in an extended state. The shrinkage ratio of the waist circumference elastic body in the waist circumference direction is smaller than the shrinkage ratio of the inner layer elastic body in the waist circumference direction at the overlapping portion and smaller than the shrinkage ratio of the outer layer elastic body in the waist circumference direction at the overlapping portion, and the pants-type wearing article according to any one of <7> to <13>.

[0064] <15> The inner layer elastic body is a filament, and the basis weight of the middle layer sheet is higher than the basis weight of the inner layer sheet, and the pants-type wearing article according to any one of <7> to <14>. <16> The middle layer sheet has a higher nonwoven bulk softness than the inner layer sheet, and the pants-type wearing article according to any one of <7> to <15>. <17> At the overlapping portion, the number of the inner layer elastic bodies per body length direction is larger than that of the outer layer elastic bodies, and the pants-type wearing article according to any one of <7> to <16>. <18> At the overlapping portion, the inner layer elastic body is a thicker filament than the outer layer elastic body, and the pants-type wearing article according to any one of <7> to <17>. <19> At the overlapping portion, the arrangement pitch of the inner layer elastic body is smaller than the arrangement pitch of the outer layer elastic body, and the pants-type wearing article according to any one of <7> to <18>. <20> The inner layer sheet extends toward the waist opening side from the overlapping portion and has a region that does not overlap with the inner layer elastic body in the thickness direction, and the pants-type wearing article according to any one of <7> to <19>.

[0065] <21> A plurality of the inner layer elastic bodies are arranged from the overlapping portion to a region extending toward the crotch portion side from the overlapping portion, and are joined and fixed in an extended state while being interposed between the inner layer sheet and the middle layer sheet. The inner layer elastic body extends along the waist circumference direction, and a plurality of them are arranged in parallel with each other. In the region extending toward the lower thigh side, the inner elastic body does not overlap the outer elastic body in the thickness direction, the pants-type wearable article according to any one of <7> to <20>.

[0066] <22> The outer elastic body extends along the waist circumference direction, and a plurality of them are arranged in parallel with each other. The inner elastic body intersects at least partially with respect to the extending direction of the outer elastic body, and has an extending direction that descends toward the lower thigh side, and a plurality of them are arranged in parallel with each other. At the portion where the inner elastic body starts to descend toward the lower thigh side, there is an intersection portion between the outer elastic body and the inner elastic body, and the intersection portion forms the overlapping portion. At the intersection portion, in the extending direction of the outer elastic body, the points where the outer elastic body intersects the inner elastic body are more on the leg opening side than on the waist opening side, the pants-type wearable article according to any one of <7> to <20>. <23> The outer elastic body and the middle sheet are intermittently adhered by a plurality of adhesive layers extending in the body length direction and intermittently arranged in the waist circumference direction. The inner elastic body and the middle sheet are continuously adhered in the waist circumference direction by an adhesive layer arranged along the inner elastic body. At the overlapping portion, the intersection angle formed by the outer elastic body and the inner elastic body is smaller than the angle formed by the adhesive layer that adheres the outer elastic body and the middle sheet and the adhesive layer that adheres the inner elastic body and the middle sheet, the pants-type wearable article according to <22>. <24> The inner elastic body overlaps the outer elastic body in the thickness direction at the overlapping portion, and descends toward the lower thigh side while curving inward in the waist circumference direction, and extends so as to overlap the absorber included in the lower thigh in the thickness direction, the pants-type wearable article according to <22> or <23>.

[0067] <25> The dorsal outer covering body forming the outer surface main body of the dorsal part and the ventral outer covering body forming the outer surface main body of the ventral part are joined at both left and right side edges by side seal parts. In the part of the ventral outer covering body joined via the overlapping part and the side seal part of the dorsal outer covering body, the number of elastic bodies is smaller than the number of elastic bodies arranged in the overlapping part, the pants-type wearable article according to any one of <7> to <24>. <26> The dorsal outer covering body forming the outer surface main body of the dorsal part and the ventral outer covering body forming the outer surface main body of the ventral part are joined at both left and right side edges by side seal parts. The part of the ventral outer covering body joined via the overlapping part and the side seal part of the dorsal outer covering body is composed of the middle layer sheet and the inner layer sheet constituting the ventral outer covering body, the pants-type wearable article according to any one of <7> to <25>.

[0068] <27> In the overlapping part, the outer layer elastic body is a filamentous body, is sandwiched and joined between the outer layer sheet and the middle layer sheet, the outer layer sheet is composed of an elastic sheet, and the shrinkage magnification in the waist circumference direction of the outer layer sheet is smaller than the shrinkage magnification in the waist circumference direction of the inner layer elastic body, the pants-type wearable article according to any one of <7> to <26>.

[0069] <28> In the overlapping part, the outer layer elastic body and the middle layer sheet are not arranged, the outer layer sheet is composed of an elastic sheet, is intermittently joined to the inner layer sheet, and the inner layer elastic body is joined between the joining parts of the outer layer sheet and the inner layer sheet by a comb gun type adhesive layer, the pants-type wearable article according to any one of <7> to <27>.

Explanation of Signs

[0070] 1 Absorbent main body 2 Outer covering body 21 Ventral outer covering body 211 Waist circumference part 212 Waist circumference part The portion of the ventral outer package body joined through the overlapping portion and the side seal portion of the dorsal outer package body 22 Dorsal outer package body 221 Waist circumference portion 222 Hip circumference portion 23 Folded-back portion 3 Region on the leg opening side in the dorsal outer package body (lower end region of the dorsal outer package body) 4 Overlapping portion 61 Outer layer sheet 62 Middle layer sheet 63 Inner layer sheet 65 Region where the inner layer sheet does not overlap with the inner layer elastic body 71 Outer layer elastic body 72 Inner layer elastic body 73 Waist circumference elastic body 74 Hip circumference elastic body 75 Crossing portion 77 Intersection point 8 Crotch side extension portion 91 Adhesive layer arranged along the outer layer elastic body 92 Adhesive layer extending in the body length direction and intermittently arranged in the hip circumference direction 10 Diaper 10F Ventral part of the diaper 10C Inguinal part of the diaper 10R Dorsal part of the diaper 10D Torso circumference part of the diaper 11 Side seal portion 12 Hip opening 13 Leg opening 14 Surface sheet 15 Back sheet 16 Absorbent body 17 Side sheet 18 Leg gather elastic body Y Body length direction of the diaper (or longitudinal direction of the absorbent main body) X Hip circumference width direction of the diaper (or width direction of the absorbent main body)

Claims

Claim 1 A pant-type wearing article including a ventral part disposed on the ventral side of the wearer, a lower crotch part disposed on the crotch side, and a dorsal part disposed on the dorsal side, and having a waist circumference direction and a body length direction, wherein the pant-type wearing article includes a waist opening disposed above the ventral part and the dorsal part in the body length direction, and a pair of leg openings disposed on the left and right of the lower crotch part, the dorsal outer body forming the outer surface of the dorsal part has a skin-side elastic region and a non-skin-side elastic region having at least the elasticity necessary for expansion and contraction in the waist circumference direction on the skin side and the non-skin side of the dorsal outer body in the region on the leg opening side, the dorsal outer body has an elastic overlapping part where the skin-side elastic region and the non-skin-side elastic region overlap each other in the thickness direction of the dorsal outer body, and in the overlapping part, the contraction magnification of the skin-side elastic region in the waist circumference direction is larger than that of the non-skin-side elastic region in the waist circumference direction, and the dorsal outer body has a crotch-side extension continuous with the overlapping part as the outer surface body on the buttocks side of the lower crotch part, the overlapping part has a laminated structure including an outer layer part, a middle layer part, and an inner layer part disposed in the region on the leg opening side, and the middle layer part is a middle layer sheet made of a sheet material, in the overlapping part, the inner layer part includes the skin-side elastic region, the outer layer part includes the non-skin-side elastic region, and the skin-side elastic region and the non-skin-side elastic region are in a position where they overlap in the thickness direction of the dorsal outer body via the middle layer sheet, the outer layer part is an elastic outer layer sheet constituting the non-skin-side outer surface, A pant-type wearing article, wherein the non-skin-side elastic region includes the elastic outer layer sheet. Claim 2 The outer layer part has an outer layer sheet made of a sheet material constituting the non-skin-side outer surface, and an outer layer elastic body that is disposed between the outer layer sheet and the middle layer sheet and is joined and fixed so as to be extensible. The outer layer elastic body is disposed having at least an extending direction along the waist circumference direction, The pant-type wearing article according to claim 1, wherein the non-skin-side elastic region includes the outer layer elastic body. Claim 3 The inner layer part has an inner layer sheet made of a sheet material constituting the skin-side inner surface, and an inner layer elastic body that is disposed between the inner layer sheet and the middle layer sheet and is joined and fixed so as to be extensible. The inner layer elastic body is disposed having at least an extending direction along the waist circumference direction, The pant-type wearing article according to claim 1 or 2, wherein the skin-side elastic region includes the inner layer elastic body. Claim 4 The inner layer portion is a stretchable inner layer sheet that constitutes the inner surface on the skin side, The pant-type wearable article according to claim 1 or 2, wherein the skin-side elastic region includes the stretchable inner layer sheet.

5. The outer layer portion includes an outer layer sheet made of a sheet material that constitutes the outer surface on the non-skin side, and an outer layer elastic body that is interposed between the outer layer sheet and the middle layer sheet and is joined and fixed so as to be extensible. The outer layer elastic body is disposed having at least an extending direction in the waist circumference direction, and the non-skin side elastic region includes the outer layer elastic body. The inner layer portion includes an inner layer sheet made of a sheet material that constitutes the inner surface on the skin side, and an inner layer elastic body that is interposed between the inner layer sheet and the middle layer sheet and is joined and fixed so as to be extensible. The inner layer elastic body is disposed having at least an extending direction in the waist circumference direction, and the skin-side elastic region includes the inner layer elastic body. The outer layer elastic body and the inner layer elastic body are disposed at positions overlapping in the thickness direction to form the overlapping portion. The pant-type wearable article according to claim 1, wherein the shrinkage magnification of the inner layer elastic body in the waist circumference direction is larger than the shrinkage magnification of the outer layer elastic body in the waist circumference direction.

6. The pant-type wearable article according to claim 5, wherein, in the overlapping portion, the adhesion length in the waist circumference direction between the outer layer elastic body and the middle layer sheet is shorter than the adhesion length in the waist circumference direction between the inner layer elastic body and the middle layer sheet.

7. In a region on the waist opening side from the overlapping portion, an extensible waist circumference elastic body is disposed along the waist circumference direction, and the waist circumference elastic body is interposed between the outer layer sheet and the middle layer sheet and is joined and fixed in an extended state. The pant-type wearable article according to claim 5 or 6, wherein the shrinkage magnification of the waist circumference elastic body in the waist circumference direction is smaller than the shrinkage magnification of the inner layer elastic body in the waist circumference direction in the overlapping portion and smaller than the shrinkage magnification of the outer layer elastic body in the waist circumference direction in the overlapping portion.

8. The pant-type wearable article according to any one of claims 5 to 7, wherein the inner layer elastic body is a filament, and the basis weight of the middle layer sheet is higher than the basis weight of the inner layer sheet.

9. A plurality of the inner layer elastic bodies are arranged from the overlapping portion to a region extending toward the crotch portion side from the overlapping portion, and are interposed between the inner layer sheet and the middle layer sheet and are joined and fixed in an extended state. The inner elastic body extends along the waist circumference direction, and a plurality of them are arranged in parallel with each other. In the region extending to the crotch side, the inner elastic body does not overlap with the outer elastic body in the thickness direction. The pants-type wearing article according to any one of claims 5 to 8.

10. The outer elastic body extends along the waist circumference direction, and a plurality of them are arranged in parallel with each other. The inner elastic body intersects at least partially with respect to the extending direction of the outer elastic body, and has an extending direction that descends toward the crotch side, and a plurality of them are arranged parallel to each other. At the portion where the inner elastic body begins to descend to the crotch side, there is an intersection portion between the outer elastic body and the inner elastic body, and the intersection portion forms the overlapping portion. At the intersection portion, in the extending direction of the outer elastic body, the points where the outer elastic body intersects with the inner elastic body are more on the leg opening side than on the waist opening side. The pants-type wearing article according to any one of claims 5 to 8.

11. The dorsal outer body forming the outer surface main body of the dorsal part and the ventral outer body forming the outer surface main body of the ventral part are joined at both left and right side edge portions by side seal portions. In the portion of the ventral outer body joined via the overlapping portion and the side seal portion of the dorsal outer body, the number of elastic bodies is less than the number of elastic bodies arranged in the overlapping portion. The pants-type wearing article according to any one of claims 5 to 10.

12. The dorsal outer body forming the outer surface main body of the dorsal part and the ventral outer body forming the outer surface main body of the ventral part are joined at both left and right side edge portions by side seal portions. The portion of the ventral outer body joined via the overlapping portion and the side seal portion of the dorsal outer body is composed of a middle layer sheet and an inner layer sheet constituting the ventral outer body. The pants-type wearing article according to any one of claims 5 to 11.

13. In the overlapping portion, the outer elastic body is a filamentous body, is sandwiched and joined between the outer layer sheet and the middle layer sheet, the outer layer sheet is composed of a stretchable sheet, and the shrinkage magnification of the outer layer sheet in the waist circumference direction is smaller than the shrinkage magnification of the inner elastic body in the waist circumference direction. The pants-type wearing article according to any one of claims 5 to 12.

14. In the overlapping portion, the outer elastic body and the middle layer sheet are not provided, the outer layer sheet is composed of an elastic sheet, is intermittently joined to the inner layer sheet, and the inner elastic body is joined by a comma gun type adhesive layer between the joining portions of the outer layer sheet and the inner layer sheet. The pants-type wearing article according to any one of claims 5 to 12.

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