Pants-type wearable items

Abstract

To provide an underpants type wearing article where, covering ability for covering the hip of the wearer can be enhanced.SOLUTION: An underpants type wearing article comprises: a pair of waist junctions 11, 11 where, a back side exterior body 22 forming an outer surface main body of a back side part 10R, and an abdominal side exterior body 21 forming an outer surface main body of an abdominal side part 10F, are joined at an end of a waist surrounding direction X; and an absorbent main body 1 which is bridged over the back side exterior body 22 and the abdominal side exterior body 21 and is fixed. On a crotch side relative to a position of the waist junction 11, a crotch side extending part 8 extending from the back side exterior body 22, extends along the waist surrounding direction X, and a plurality of elastic bodies 7 which is arranged at intervals along a body height direction Y is joined to the crotch side extending part in a stretched state and in a manner of capable of being stretched and shrunk. The crotch side extending part 8 has: a rigidity part 4 which has, a lower region 83 where extension stress in the waist surrounding direction X by the elastic bodies 7 is greater than that in an upper region 82 in the body height direction Y, and extends along the body height direction Y. The rigidity part 4 has on its lower part, a high rigidity part 48 where rigidity is relatively great in the rigidity part 4.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] Wearable articles such as diapers come in various types, such as tape-type and pants-type. A known type of pants-type wearing article is one having an outer body divided into a ventral portion, a crotch portion, and a back portion. The ventral and back outer bodies are fixed at their widthwise ends at left and right waist joints to form a ring-shaped waistband. This type of pants-type wearing article has the advantage of providing ample legroom in the crotch area, allowing the wearer to move their legs easily, and also providing a streamlined appearance when worn. However, the buttocks must be securely covered by the outer body, and techniques have been proposed in which a crotch extension is provided on the crotch side of the back outer body, which forms the back portion (Patent Documents 1 to 3). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-115304 [Patent Document 2] Japanese Patent Application Laid-Open No. 2011-101813 [Patent Document 3] Japanese Patent Application Laid-Open No. 2011-240054 Summary of the Invention [Problem to be solved by the invention]

[0004] In pants-type wearing articles such as those described above, the crotch side extension portions are not fixed at the waist joints to ensure mobility around the thighs. Therefore, the crotch side extension portions are easily turned up by external forces, which can lead to leakage and poor appearance due to exposure of the buttocks. Proposals have been made to prevent the crotch side extension portions from turning up, such as by providing elastic bodies in the crotch side extension portions (Patent Documents 1 to 3). However, these proposals are not sufficient in terms of preventing leakage and poor appearance, and there is room for improvement. In view of the above, the present invention provides a pants-type wearing article that has high resistance to rolling up of the crotch extensions when worn and has high coverage of the wearer's buttocks. [Means for solving the problem]

[0005] The present invention provides a pants-type wearing article having a waist circumference direction and a body length direction, the pants-type wearing article comprising a waist-side portion arranged on the waist side of a wearer, a crotch portion arranged on the crotch side, and a back-side portion arranged on the back side, the pants-type wearing article comprising a pair of waist joints formed by joining a back outer body forming an outer surface main body of the back side portion and a front outer body forming an outer surface main body of the front side portion at their ends in the waist circumference direction, and an absorbent main body fixed so as to bridge between the back outer body and the front outer body, the absorbent main body being disposed on the crotch side of the waist joints. a crotch side extension portion extending from the back side outer body, and a plurality of elastic bodies extending along the waist circumference direction and arranged at intervals along the body length direction are joined to the crotch side extension portion in a stretched state so as to be stretchable and contractible; the crotch side extension portion has a lower region in which the stretching stress in the waist circumference direction caused by the elastic bodies is greater than that in an upper region in the body length direction, and has a rigid portion extending along the body length direction, and the rigid portion has a high-rigidity portion at a lower position within the rigid portion that is relatively more rigid. [Effects of the Invention]

[0006] The pants-type wearing article of the present invention has a high ability to prevent the crotch extensions from rolling up when worn, and can provide improved coverage of the wearer's buttocks. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a perspective view schematically showing a pants-type diaper as a preferred embodiment of a pants-type wearing article according to the present invention. [Figure 2] 2 is a partially cutaway exploded plan view showing the pants-type wearing article shown in FIG. 1 in a state in which the article has been broken at a waist joint, opened, and stretched, as viewed from the non-skin side. FIG. [Figure 3] 3 is an explanatory view showing a schematic diagram of the arrangement of elastic members in the back outer body of the pants-type wearing article shown in FIG. 2.

[0023] FIG. [Figure 4] 10(A) to 10(C) are explanatory diagrams schematically illustrating other preferred embodiments of the arrangement of elastic members on the back outer main body of the pants-type wearing article shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

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

[0009] 1, a pants-type diaper 10 (hereinafter also referred to as the diaper 10) of this embodiment comprises a ventral portion 10F arranged on the ventral side of a wearer, a crotch portion 10C arranged on the crotch side, and a dorsal portion 10R arranged on the dorsal side, and has a waist-circumference direction X and a body-length direction Y. The diaper 10 also comprises a waist opening 12 arranged above the ventral portion 10F and the dorsal portion 10R in the body-length direction Y, and a pair of leg openings 13, 13 arranged on the left and right sides of the crotch portion 10C.

[0010] The diaper 10 comprises an absorbent main body 1 and an exterior body 2 as its constituent members. The exterior body 2 comprises a ventral exterior body 21 and a rear exterior body 22, which form the outer surfaces of the ventral portion 10F and the rear portion 10R, respectively. The ventral exterior body 21 and the rear exterior body 22 are joined at their respective ends in the waist-circumferential direction X to form a pair of waist joints 11, thereby forming an annular waist circumference portion 10D of the diaper 10. The waist joints 11 can be joined by various methods used for this type of article. Examples include pressure-integrated joining such as fusion joining (e.g., heat sealing, ultrasonic sealing, laser fusing) and pressure joining (e.g., embossing). Furthermore, a crotch side extension 8 extending from the back exterior body 22 is disposed closer to the crotch portion 10C than the position of the waist joint 11. The crotch side extension 8 covers a portion of the non-skin side of the absorbent main body 1 in the crotch portion 10C and forms part of the outer surface main body on the buttocks side of the crotch portion 10C. The region 8P of the crotch side extension 8 that does not overlap with the absorbent main body 1 (the region 8P of the crotch side extension 8 that is to the left and right of the overlapping portion of the crotch side extension 8 and the absorbent main body 1 in the waist circumference direction X) has a frill-like pleated portion 81 at its outer periphery. In this embodiment, the crotch side extension 8 is an extension of the sheet member that constitutes the back exterior body 22, and this crotch side extension 8 and the back exterior body 22 are seamlessly integrated. In this case, the back exterior body 22 refers to a portion corresponding to the length of the pair of left and right waist joints 11 in the body length direction Y, and the extending portion on the crotch side of the waist joint 11 is defined as the crotch side extension 8. The crotch-side extension 8 is not limited to this form and may be made of, for example, a sheet member separate from the back-side exterior body 22. In this case, too, the back-side exterior body 22 and the crotch-side extension 8 are distinguished based on the position of the waist joint 11. The crotch-side extension 8 may have various shapes that cover a portion of the non-skin-facing side of the absorbent main body 1 and have an area corresponding to the area around the wearer's buttocks on the outer side of the absorbent main body 1 in the waist direction X. Among these, from the viewpoint of balancing elongation stress and rigidity, it is preferable that the crotch-side extension 8 has a shape in which the width in the waist direction X does not change from the lower edges of the left and right waist joints 11, 11 toward the crotch portion 10C.

[0011] The absorbent main body 1 is fixed so as to bridge between the back-side exterior body 22 and the ventral-side exterior body 21. Specifically, the absorbent main body 1 is arranged on the skin side of the exterior body 2 in the ventral-side portion 10F and the back-side portion 10R, and the further extending portion forms the crotch portion 10C. In the diaper 10 configured as above, the upper open portion of the waist portion 10D serves as the waist opening 12. The open portions on both the left and right sides of the crotch portion 10C serve as the pair of leg openings 13, 13 described above.

[0012] 2 shows the diaper 10 in an unfolded state, with the diaper 10 broken at the waist joints 11, 11 and stretched, as viewed from the non-skin side. The unfolded state refers to the state in which each part of the pants-type absorbent article is stretched and spread out flat. In the unfolded state, the 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 unfolded state of the diaper 10, a horizontally elongated ventral outer body 21 and a horizontally elongated dorsal outer body 22 are disposed corresponding to the ventral portion 10F and the dorsal portion 10R, respectively. The vertically elongated absorbent main body 1 is disposed on the skin side of the ventral outer body 21 and the dorsal outer body 22, with its longitudinal direction directed toward the ventral portion 10F, the crotch portion 10C, and the dorsal portion 10R of the diaper 10. The skin side of the end portions of the absorbent main body 1 in the longitudinal direction Y may be covered by the folded-back portions of the ventral outer body 21 and the dorsal outer body 22 disposed on the non-skin side. As shown in Fig. 2, the absorbent main body 1 has a liquid-permeable top sheet 14 on the skin side, a leakproof back sheet 15 on the non-skin side, and a liquid-retentive absorber 16 disposed between the top sheet 14 and the back sheet 15. The absorbent main body 1 may further have a pair of side sheets on both sides in the longitudinal direction Y. Leg gather elastics joined in a stretched state along the longitudinal direction Y may be disposed at the outer ends of the side sheets in the width direction X, thereby forming leg gathers around the leg openings 13.

[0013] Next, the rear exterior body 22 will be described. The back-side exterior body 22 that forms the outer surface main body of the back-side portion 10R has a laminated structure that includes an outer layer sheet 61 and an inner layer sheet 62, with the elastic body 5 disposed between these sheets. A plurality of elastic bodies 5 (stretchable members) extending in the waist circumference direction X and arranged at intervals along the body length direction Y are joined to the back-side exterior body 22 at the positions of the waist joints 11, 11 in a stretched state so as to be stretchable. The elastic bodies 5 provide the back-side exterior body 22 with the elasticity necessary for stretching at least in the waist circumference direction X. FIG. 3 shows an example of the arrangement of the elastic bodies 5 in the back-side exterior body 22. The outer layer sheet 61 is omitted in FIG. 3 to make the arrangement of the elastic bodies 5 easier to see. The elastic bodies 5 arranged in the back-side exterior body 22 extend in the waist circumference direction X with both ends joined and fixed to the left and right waist joints 11, 11, and are joined and fixed between the sheets. In the region where the back-side exterior body 22 and the absorbent main body 1 overlap, the elastic bodies 5 are partially cut at the layered portion between the back-side exterior body 22 and the absorbent main body 16. The cut ends of each elastic body 5 are joined to the back-side exterior body 22 at positions overlapping both the left and right sides of the absorbent main body 16, and are stretchable between the other ends joined to the waist joints 11. The elastic bodies 5 are preferably intermittently bonded to the outer layer sheet 61 and the inner layer sheet 62 with an adhesive.

[0014] Next, the crotch extension portion 8 will be described. As described above, the crotch-side extension portion 8 extends from the back-side exterior body 22 to the crotch side beyond the position of the lower end of the waist joint portion 11 of the back-side exterior body 22 . The crotch extension portion 8 has a laminated structure in which an outer layer sheet 63 and an inner layer sheet 64 are provided with an elastic body 7 disposed between these sheets. The outer layer sheet 63 and the outer layer sheet 61, and the inner layer sheet 64 and the inner layer sheet 62 are seamlessly integrated. The ratio (Y1 / Y2) of the length (Y1) of the crotch-side extension portion 8 in the body length direction Y to the length (Y2) of the back-side exterior body 22 corresponding to the waist joint portions 11, 11 in the body length direction Y is preferably 0.25 or more, more preferably 0.3 or more, from the viewpoint of covering the area around the buttocks of the wearer. Moreover, from the viewpoint of preventing rolling-up, the ratio is preferably 0.55 or less, more preferably 0.5 or less.

[0015] A plurality of elastic bodies 7 (stretchable members) extending in the waist-circumferential direction X and arranged at intervals along the body-length direction Y are stretchably joined in a stretched state to the crotch-side extension portion 8. As shown in Fig. 3, the elastic bodies 7 have the same structure as the back-side exterior body 22 in the portion overlapping with the absorbent main body 16. Preferably, the elastic bodies 7 are intermittently bonded to the outer layer sheet 63 and the inner layer sheet 64 with an adhesive. In Fig. 3, the outer layer sheet 63 is omitted to make the arrangement of the elastic bodies 7 easier to see, and further, the rigid portion 4, which will be described later, is shown overlapping the arrangement of the elastic bodies 7.

[0016] The crotch side extension portion 8 has a lower region 83 in which the elongation stress in the waist-circumferential direction X due to the elastics 7 is greater than that in the upper region 82 in the body length direction Y. The upper region 82 and the lower region 83 refer to the entire region in the waist-circumferential direction X above and below the position of the crotch side extension portion 8 in the body length direction Y. Here, the "elongation stress due to the elastics 7 in the upper region 82" and the "elongation stress due to the elastics 7 in the lower region 83" refer to the elongation stress of the laminated structure of the outer layer sheet 63, the inner layer sheet 64, and the elastics 7, on which the elastics 7 arranged in each region act. The elastics 7 arranged in the upper region 82 and the lower region 83 may be distinguished as elastics 72 and 73, respectively. The extension stress means the contractile force of each region against an external force that tries to extend the region. The magnitude of the extension stress indicates the magnitude relationship of the contractile force of the upper region 82 and the lower region 83 of the crotch extension portion 8, which include the elastic bodies 72 and 73. The upper region 82, where the extension stress due to the elastic body 72 is small, has a small contractile force, while the lower region 83, where the extension stress due to the elastic body 73 is large, has a large contractile force. The stretching stress of the elastics 7 in the upper region 82 and the lower region 83 of the crotch extension portion 8 is appropriately set by the number, pitch, type (diameter, material) and stretch rate of the elastics. The upper region 82 and the lower region 83 in the crotch extension portion 8 can be distinguished by the difference in elongation stress caused by the elastics 72 and 73. More specifically, the upper region 82 and the lower region 83 are distinguished by the position where at least one of the pitch, type (diameter, material), elongation rate, and bonding length of the various elastics 7 extending along the waist circumference direction X changes. When focusing on the pitch, the upper region 82 and the lower region 83 change when observed from bottom to top in the body length direction Y, if there is a change in spacing of more than ±10% from a predetermined spacing. The boundary between each region is the edge of the region immediately above in the body length direction Y or the edge below the lowest elastic 7 of the region immediately above.

[0017] (Method for comparing tensile stress) In the present invention, the comparison of the tensile stress of the upper region 82 and the lower region 83 is carried out by calculating the difference (cm) between the length in the waist direction X at maximum elongation and the length in the natural state of each region, and comparing the obtained differences. The larger the difference, the higher the tensile stress in that region. The above measurements are performed after the upper region 82 and the lower region 83 are removed from the diaper 10. Specifically, the waist joint 11 of the diaper 10 is separated. The absorbent main body 1 is removed, and the waist joint 11 is cut parallel to the waist-circumference direction X at the position of the lower end in the body length direction Y to cut out the crotch side extension 8. The crotch side extension 8 is then cut into the upper region 82 and the lower region 83. Upper region 82 and lower region 83 are shown in their maximum extended (deployed) state in FIG. The comparison of the tensile stress of each of the upper and lower regions 82 and 83 can also be carried out by measuring the tensile stress of each region using the measurement method described below and directly comparing the measured values.

[0018] By having the above-mentioned configuration of the crotch side extension portion 8, the region 8P of the crotch side extension portion 8 that does not overlap with the absorbent main body 1 (regions of the crotch side extension portion 8 on the left and right outer sides in the waist direction X than the portion that overlaps with the absorbent main body 1) has a contractile force in the waist direction Y, and the contractile force is stronger in the lower part (crotch side). This allows the crotch side extension portion 8 to easily fit the curves around the wearer's buttocks.

[0019] To enhance the effectiveness of the above-mentioned effects, the ratio (S3 / S2) of the tensile stress (S3) caused by the elastic body 73 in the lower region 83 to the tensile stress (S2) caused by the elastic body 72 in the upper region 82 is preferably 1.1 or more, more preferably 1.3 or more, and even more preferably 1.5 or more. Furthermore, to cover the area around the buttocks of the wearer, the ratio (S3 / S2) is preferably 4.2 or less, more preferably 4.0 or less, and even more preferably 3.8 or less. The elongation stress (S2) of the elastic body 72 in the upper region 82 is preferably 4.2 N / mm or less, more preferably 4.0 N / mm or less, and even more preferably 3.8 N / mm or less, from the viewpoint of covering the area around the buttocks of the wearer. The elongation stress (S2) is preferably 0.4 N / mm or more, more preferably 0.5 N / mm or more, and even more preferably 0.6 N / mm or more, from the viewpoint of covering the area around the buttocks of the wearer. The elongation stress (S3) of the elastic body 73 in the lower region 83 is preferably 0.7 N / mm or more, more preferably 0.8 N / mm or more, and even more preferably 0.9 N / mm or more, from the viewpoint of covering the buttocks of the wearer. The elongation stress (S3) is preferably 5.5 N / mm or less, more preferably 5.3 N / mm or less, and even more preferably 5.1 N / mm or less, from the viewpoint of covering the buttocks of the wearer.

[0020] (Method for measuring tensile stress) The upper region 82 and the lower region 83 of the crotch extension portion 8 are removed from the diaper 10 in the same manner as described above (method for comparing elongation stress). Both ends of the upper region 82 and the lower region 83 of the crotch extension portion 8 in the width direction X are fixed with chucks, and the crotch extension portion 8 is stretched in the width direction X at a speed of 300 mm / min using an autogram tester. The stress at 70% of the maximum stretch (100%) is measured. This measured value is divided by the length in the length direction Y to convert it to a value per unit length (mm), and this converted value is used as the shrinkage stress in the width direction X of each stress band region. Note that the above autogram test can be performed using, for example, Orientec's "RTA-100."

[0021] The position of the lower region 83 in the body length direction Y is preferably within a range of 75% or less, and more preferably within a range of 25% or less, from the crotch side edge of the crotch side extension portion 8 with respect to the length in the body length direction Y of the crotch side extension portion 8. The upper region 82 is a region above the lower region 83 in the crotch side extension portion 8.

[0022] The upper region 82 and the lower region 83 may each be further divided into a plurality of stress band regions in which the tensile stress caused by the elastic body 7 differs from one another along the length direction Y. The division of each stress band region can be performed in the same manner as described above. When three or more stress band regions are formed in the crotch side extension portion 8, the region from the lowest end of the crotch side to the upper end of the stress band region in which the tensile stress caused by the elastic body 7 is the highest is defined as the lower region 83, and the stress band region above that in the length direction Y is defined as the upper region 82. It is preferable that the length (width) of each stress band region in the length direction Y be 20 mm or less. By making the length (width) of each stress band region 20 mm or less, the crotch-side extension 8 can adapt to follow more minute changes in the wearer's body contours. For example, the crotch-side extension can precisely follow the small changes in the shape of the wearer's body from the buttocks to the groin, such as the roundness of the buttocks.

[0023] Furthermore, the crotch side extension portion 8 has a rigid portion 4 extending along the body length direction. The rigid portion 4 has a high-rigidity portion 48 below it, which has a relatively high rigidity within the rigid portion 4. The rigid portions 4 are arranged in pairs in regions 8P of the crotch side extension portion 8 that do not overlap with the absorbent main body 1 (regions 8P of the crotch side extension portion 8 that are outward on the left and right in the waist circumference direction X from the overlapping portion between the crotch side extension portion 8 and the absorbent main body 1). The rigid portion 4 refers to a region where the rigidity of the laminated structure of the outer layer sheet 63, inner layer sheet 64, and elastic body 7 (72, 73) that constitutes the crotch extension portion 8 is higher than the rigidity of the laminated structure of the adjacent surrounding region. The high rigidity portion 48 refers to a region with higher rigidity within the rigid portion 4. Note that the portion of the rigid portion 4 excluding the high rigidity portion 48 is also referred to as the upper portion 47 excluding the high rigidity portion 48 or simply as the upper portion 47. The rigidity of the rigid portion 4 and the high rigidity portion 48 is indicated by the value of bending rigidity (hereinafter, sometimes simply referred to as "rigidity").

[0024] (Method for measuring bending stiffness) In the present invention, bending rigidity (rigidity) means bending resistance measured by the handle-ometer method specified in JIS L 1913: 2010. Measurement is generally performed in the state of the absorbent article itself, but if measurement is difficult in the state of the absorbent article itself because the size of the measurement area is too small, for example, the sheet constituting the measurement area may be removed and placed on a support table for measurement.

[0025] The rigid portion 4 can be formed by various methods as long as the above-mentioned effects are achieved. For example, rigidity can be imparted by forming a consolidated, integrated structure of the members (the outer layer sheet 63, the inner layer sheet 64, and the elastic body 7 (72, 73)) that make up the crotch extension portion 8 by fusion bonding, pressure bonding (e.g., embossing), adhesive bonding, etc. Rigidity can also be imparted to the rigid portion 4 by increasing the number of members laminated. The high-rigidity portion 48 within the rigid portion 4 can be formed by increasing the degree of embossing, arranging multiple rigid structural members more closely together, arranging multiple structural members, increasing the area of ​​the rigid structural members, increasing the number of laminated members, increasing the basis weight of the adhesive, etc., compared to the upper portion 47 within the rigid portion 4.

[0026] The planar shape of the rigid portion 4 is not particularly limited, and may be any of various shapes that can achieve the above-mentioned effects. For example, the shape of the rigid portion 4 may be a line, a band, a rectangle, an ellipse, etc. Among these, it is preferable that the rigid portion 4 is a line or a band as a portion extending in the length direction Y. 2 and 3, the rigid portion 4 is composed of an assembly of band-shaped structural portions 41 and 42 that are elongated in the body length direction Y and formed by embossing, and are arranged at the left and right ends of the crotch extension portion 8 in the waist circumference direction X. In this example, a high-rigidity portion 48 is formed by arranging the structural portions 41 and 42 in the waist circumference direction X within the rigid portion 4. In this way, the rigid portion 4 can be structurally distinguished from the crotch extension portion 8 other than the rigid portion 4 by visually observing it along the waist circumference direction X or by checking the feel of it. When each of the pair of left and right rigid portions 4, 4 is an assembly of a plurality of structures, the rigid portions 4, 4 are defined as the portions inside an imaginary line connecting the outermost sides of each of the left and right structures in the waist circumference direction X and the body length direction Y with a straight line.

[0027] As described above, since the crotch side extension portion 8 has the upper region 82, the lower region 83, and the rigid portion 4, the lower region 83 in the body length direction Y of the crotch extension portion 8 contracts more strongly than the upper region 82 due to the elastic body 73, and the portion in the body length direction Y to which the rigid portion 4 is attached is less likely to deform. More specifically, the elastic bodies 7 (72, 73) extending in the waist circumference direction X of the upper region 82 and the lower region 83 prevent the outer peripheral edge of the crotch side extension portion 8 from rolling up toward the non-skin-facing side in the waist circumference direction X, and this rolling-up prevention force is stronger in the crotch side lower region 83. In addition, the rigid portion 4 extending in the body length direction Y makes it difficult for the region 8P of the crotch side extension portion 8 that does not overlap with the absorbent main body 1 to bend in the body length direction Y, and this bending resistance is stronger in the crotch side high rigidity portion 48. As a result, in the region 8P where the crotch extension portion 8 does not overlap with the absorbent body 1, a plane including the body length direction Y and the waist circumference direction X is maintained, making it difficult to roll up toward the non-skin side, and the elongation stress of the elastic body 7 (72, 73) can cover and encase the curves around the wearer's buttocks.

[0028] The area of ​​the rigid portions 4, 4 is not particularly limited as long as the desired rigidity can be imparted to the rigid portions 4, 4. However, it is preferable that the area of ​​each of the pair of rigid portions 4, 4 is 1200 mm 2 Over 2400mm 2 It is preferable that the area is equal to or less than 1000. When the rigid portions 4, 4 are an aggregate of a plurality of structural portions exhibiting rigidity, the above area is the total area of ​​the structural portions on the left and right sides.

[0029] To enhance the effectiveness of the above-described effects, the ratio (K3 / K1) of the stiffness (K3) of the high-rigidity portion 48 to the stiffness (K1) of the upper portion 47 excluding the high-rigidity portion 48 is preferably 1.1 or more, more preferably 1.3 or more, and even more preferably 1.5 or more. Furthermore, to prevent deterioration in texture, the ratio (K3 / K1) is preferably 5 or less, more preferably 4 or less, and even more preferably 3 or less.

[0030] In the rigid portion 4, the difference in rigidity between the high rigidity portion 48 and the upper portion 47 excluding the high rigidity portion 48 can be provided by various methods. For example, a difference in rigidity can be achieved by making the area of ​​the rigid portion 4 larger in the high rigid portion 48 than in the upper portion 47 excluding the high rigid portion. The ratio (D2 / D1) of the area (D2) of the high rigid portion 48 to the area (D1) of the upper portion 47 excluding the high rigid portion 4 is preferably 1.1 or more, more preferably 1.3 or more, and even more preferably 1.5 or more. From the viewpoint of suppressing deterioration in texture, the ratio (D2 / D1) is preferably 5 or less, more preferably 4 or less, and even more preferably 3 or less.

[0031] Furthermore, when each of the left and right rigid portions 4 is an assembly of a plurality of structural portions, by making the number of structural portions greater in the high rigidity portion 48 than in the upper portion 47 excluding the high rigidity portion, it is possible to create a difference in rigidity in the up-down direction of the body length Y. For example, as shown in Figures 2 and 3, an embodiment can be made in which the upper portion 47 is a structural portion 41 and the lower high rigidity portion 48 is an assembly of the structural portion 41 and the structural portion 42. The ratio (N2 / N1) of the number (N2) of structural parts constituting the high-rigidity portion 48 to the number (N1) of structural parts constituting the upper portion 47 is preferably 1.1 or more, more preferably 1.2 or more, and even more preferably 1.3 or more. From the viewpoint of preventing deterioration in texture, the ratio (N2 / N1) is preferably 5 or less, more preferably 4 or less, and even more preferably 3 or less.

[0032] The positions of the left and right rigid portions 4 are not particularly limited as long as they achieve the above-mentioned effect, but they are preferably arranged biased toward the left and right end portions of the crotch side extension portion 8 in the waist circumference direction X. For example, the rigid portions 4 are preferably located closer to the end portions than the middle position of the length in the waist circumference direction X in the region 8P of the crotch side extension portion 8 that does not overlap with the absorbent main body 1. Furthermore, the positions of the rigid portions 4 in the waist circumference direction X are preferably within a range of 40% of the length of the crotch side extension portion 8 in the waist circumference direction X, and more preferably within a range of 35% of the length of the crotch side extension portion 8 in the waist circumference direction X from the left and right outer ends of the crotch side extension portion 8 in the waist circumference direction X. Furthermore, it is preferable that each of the left and right rigid portions 4 is located at the end in the waist circumference direction X (the end is defined as a range of 30% of the length in the waist circumference direction X from the end edge in the waist circumference direction X). More specifically, it is more preferable that the rigid portion 4 is located in a region where each of the left and right waist joints 11 in the waist circumference direction X extends toward the crotch portion 10C and / or a region inscribed in said region. The region where the waist joints 11 extend toward the crotch portion 10C is a region where one end of each of the elastic bodies 72 and 73 is joined and fixed using one end of each of the elastic bodies 72 and 73 as the base point for expansion and contraction. In other words, the rigid portion 4 may also serve as a joining portion that joins and fixes one end of each of the elastic bodies 7 (72, 73) to the outer layer sheet 63 and the inner layer sheet 64.

[0033] The position of the rigid portion 4 in the body length direction Y is preferably located over the entire length of the crotch side extension portion 8 in the body length direction Y. The position of the high rigidity portion 48 in the body length direction Y is preferably within a range of 75% of the length of the rigid portion 4 in the body length direction Y from the crotch side end portion of the rigid portion 4 in the body length direction Y, and more preferably within a range of 25%.

[0034] In the crotch extension portion 8, it is preferable that the position of the high rigidity portion 48 in the rigid portion 4 in the length direction Y overlaps with the position of the lower region 83 in the length direction Y, and it is preferable that it is within the position of the lower region 83 in the length direction Y, and it is more preferable that they coincide.

[0035] When each of the left and right rigid portions 4 has a belt shape, the width of the belt (length in the waist circumference direction X) is preferably 65 mm or more and 115 mm or less. When the rigid portion 4 is an assembly of multiple structural portions, it is preferable that the entire assembly is located at the above-mentioned position in the waist circumference direction X and body length direction Y. It is also preferable that each portion is within the above-mentioned belt width range.

[0036] As described above, the diaper 10 has the above-described configuration, which provides high roll-up prevention for the crotch extensions 8, allows the crotch extensions 8 to easily conform to the curve of the buttocks, and provides high coverage of the buttocks. This allows the diaper 10 to suppress leakage of excrement from the crotch extensions 8 and improves the appearance when worn.

[0037] The bonding between the components of the back exterior body 22 and the crotch extension portion 8 can be formed by various means commonly used in this type of article. For example, the components can be integrated by the aforementioned fusion bonding or pressure bonding, or by bonding using a highly thermoplastic adhesive such as a hot melt adhesive. There are no particular restrictions on the method of applying the hot melt adhesive, and either a contact method or an application method may be used. For example, the adhesive can be applied by spraying it along the direction in which the elastic body is arranged.

[0038] A preferred embodiment for applying tensile stress by the elastic body 7 to the upper region 82 and the lower region 83 will be described below. The tensile stress due to the elastic bodies 7 in the upper region 82 and the lower region 83 can be set appropriately by the elongation rate, thickness, number, material, etc. of the elastic bodies 7 arranged in these regions, and the adhesive length between the elastic bodies 7 and the outer layer sheet 63 and the inner layer sheet 64. The tensile stress due to the elastic bodies 7 may be set by one type of these, or by combining multiple types.

[0039] With regard to the elongation rate and thickness of the elastic body 7, it is preferable that the thickness and elongation rate of the elastic body 73 disposed in the lower region 83 be greater than the thickness and elongation rate of the elastic body 72 in the upper region .

[0040] When the elongation rate of the elastic body 73 arranged in the lower region 83 is made larger than the elongation rate of the elastic body 72 in the upper region 82, the ratio (E3 / E2) of the elongation rate (E3) of the elastic body 73 to the elongation rate (E2) of the elastic body 72 is preferably 1.1 or more, more preferably 1.3 or more, and even more preferably 1.5 or more. From the viewpoint of covering the area around the buttocks of the wearer, the ratio (E3 / E2) is preferably 6.0 or less, more preferably 5.8 or less, and even more preferably 5.6 or less. In the present invention, the average elongation of the elastic bodies 7 disposed in the region is determined by the method described below, and this average elongation is defined as the "elongation of the elastic bodies 7" in that region. The average elongation can be measured by the following method.

[0041] [Method for measuring average elongation of elastic body] The waist joint 11 of the diaper 10 is separated. The absorbent body 1 is removed, and the waist joint 11 is cut parallel to the waist circumference direction X at the lower end position in the body length direction Y to cut out the crotch side extension 8. Furthermore, the crotch side extension 8 is cut into an upper region 82 and a lower region 83. Then, the length of each of the cut-out elastics 7 (72) in the upper region 82 is measured when the diaper 10 is in an expanded and stretched state. From these measurements, the average length of all the elastics 7 in the upper region 82 in their maximum stretched state is calculated. The length of the elastics 7 in the expanded and stretched state may also be measured by removing all the elastics 7 using the method described below and then measuring the length in the lateral direction X of the upper region 82 where the elastics 7 were located. Next, all of the elastic bodies 7 fixed to the upper region 82 by adhesive or the like are removed from the other components of the upper region 82 using an appropriate solvent such as ethyl acetate, and the natural lengths of the elastic bodies 7 in the upper region 82 are measured. From this measurement value, the average length of all of the natural lengths of the elastic bodies 7 in the upper region 82 is calculated. Then, in the upper region 82, the ratio of the average length of the elastic body 7 in the expanded and stretched state to the average length of the elastic body 7 in its natural length is calculated, and this is defined as the average elongation rate of the elastic body 7 in the upper region 82. The average elongation rate of the elastic body 7 (73) in the lower region 83 can also be measured in the same manner as the average elongation rate of the elastic body 7 (72) in the upper region 82, except that the measurement region is the lower region 83 and the elastic body of the elastic body 7 (73) in the lower region 83 is the measurement target.

[0042] When the thickness of the elastic body 73 arranged in the lower region 83 is made thicker than the thickness of the elastic body 72 arranged in the upper region 82, the ratio (G3 / G2) of the thickness (G3) of the elastic body 73 to the thickness (G2) of the elastic body 72 is preferably 2.0 or more, more preferably 2.2 or more, and even more preferably 2.4 or more. From the viewpoint of covering the area around the buttocks of the wearer, the ratio (G3 / G2) is preferably 2.9 or less, more preferably 2.7 or less, and even more preferably 2.5 or less.

[0043] When the number of elastic bodies 73 arranged in the lower region 83 is greater than the number of elastic bodies 72 in the upper region 82, the ratio of the number of elastic bodies 73 to the number of elastic bodies 72 is preferably 1.1 or more, more preferably 1.2 or more, and even more preferably 1.3 or more. From the viewpoint of covering the area around the buttocks of the wearer, the ratio is preferably 1.6 or less, more preferably 1.5 or less, and even more preferably 1.4 or less.

[0044] 4(A) to 4(C) are specific examples of combinations of the elongation rate, thickness, and number of the elastic body 7. In Fig. 4(A) to 4(C), the ratio of the elongation rate (E3) of the elastic body 73 to the elongation rate (E2) of the elastic body 72 is set to 1.1 or more. 4(A), five elastic bodies 72 are arranged at equal intervals in the upper region 82, and two elastic bodies 73 that are thicker than the elastic bodies 72 are arranged at equal intervals in the lower region 83. The upper region 82 includes one stress band region. 4(B), four elastic bodies 72 are arranged in the upper region 82, and the four elastic bodies 72 are separated into two upper and two lower groups with a space between them, while three elastic bodies 73, which are thicker than the elastic bodies 72, are arranged at equal intervals in the lower region 83. The upper region 82 includes two stress band regions. 4(C), three elastic bodies 72 are arranged in the upper region 82, and the three elastic bodies 72 are separated into two upper elastic bodies and one lower elastic body with a space between them, and three elastic bodies 73 thicker than the elastic bodies 72 are arranged at equal intervals in the lower region 83. The upper region 82 includes two stress band regions.

[0045] When the elongation stress caused by the elastic body 7 in the upper region 82 and the lower region 83 is set by the adhesive bonding length between the elastic body 7 and the outer layer sheet 63 and the inner layer sheet 64, it is preferable that the adhesive bonding length of the elastic body 73 arranged in the lower region 83 is longer than the adhesive bonding length of the elastic body 72 arranged in the upper region 82. The ratio (L3 / L2) of the bonded length (L3) of elastic body 73 to the bonded length (L2) of elastic body 72 is preferably 1.1 or more, more preferably 1.3 or more, and even more preferably 1.5 or more, as a ratio of bonded length per 1 mm of elastic body, from the viewpoint of covering the area around the buttocks of the wearer, and the ratio (L3 / L2) is preferably 2.0 or less, more preferably 1.8 or less, and even more preferably 1.6 or less, as a ratio of bonded length per 1 mm of elastic body. The adhesive length refers to the length along the waist direction of the adhesive used to secure the elastic body 7 to the outer layer sheet 63 and inner layer sheet 64, applied at a position that overlaps the elastic body in a plan view; if one elastic body is secured at multiple locations, it refers to the total applied length. The longer the adhesive length, the longer the length in the waist direction X of the portion of the outer layer sheet 63 and inner layer sheet 64 that is affected by the contraction of the elastic body 7, and the greater the elongation stress. The adhesive length can be measured using the following method.

[0046] (Method for measuring adhesive length) (1) Remove the elastic 7 from the crotch extension 8, measure the elastic 7 in a non-stretched state to a predetermined length, and mark both ends of the elastic 7. The predetermined length can be set appropriately depending on the size of the article, and can be, for example, 100 mm. (2) The length of the adhesive portion between the marks along the longitudinal direction of the elastic body is measured as follows. When a continuous adhesive portion exists, the length of the elastic body between the marks is regarded as the length of the adhesive. If the adhesive is present intermittently, the total length of the adhesive along the longitudinal direction of the elastic body is taken as the adhesive length. For example, in the case of a spiral coating of hot melt adhesive, the width of one spiral is measured at five points using a microscope, the average value is taken as the spiral width, and this value is multiplied by the number of spiral lines that overlap the elastic body to determine the adhesive length. (3) The adhesive length measured in (2) above is divided by the predetermined length measured in (1) above to obtain the adhesive length per 1 mm of the elastic body. If the adhesive application area cannot be visually determined, a colored toner such as black (for example, Brother Industries, Ltd., product name "Refill Toner Powder Bottle for Laser Printers 560971") is sprayed onto the surface of the elastic body to color the adhesive adhering to the surface of the elastic body. After that, the excess toner is blown away with air or removed with a vacuum cleaner so that the toner is visible only in the adhesive area, and then the above measurement is performed.

[0047] It is preferable that the elongation stress due to the elastics 7 in the upper region 82 and the lower region 83 of the crotch side extension 8 has the following relationship with the elongation stress due to the elastics 5 of the back-side exterior body 22 above the crotch side extension 8. Here, the portion of the back-side exterior body 22 adjacent to the upper region 82 of the crotch side extension 8 in the body length direction Y is called the lower end connection region 3. That is, when the elongation stress due to the elastics 5 (51) of the lower end connection region 3 of the back-side exterior body 22 adjacent to the upper region 82 of the crotch-side extension 8 is (S1), the elongation stress due to the elastics 72 of the upper region 82 of the crotch-side extension 8 is (S2), and the elongation stress due to the elastics 73 of the lower region 83 of the crotch-side extension 8 is (S3), it is preferable that the relationship in magnitude of the respective elongation stresses be (S2)<(S1)<(S3). Such a relationship between the three elongation stresses (S1, S2, S3) allows the garment to conform to the body shape when worn, prevents it from slipping off the wearer, and covers the area around the buttocks. In the above relationship, the ratio (S1 / S2) of the tensile stress (S1) in the lower end connection region 3 to the tensile stress (S2) in the upper region 82 is preferably 1.1 or more, more preferably 1.3 or more, and even more preferably 1.5 or more, from the viewpoint of following the variation in the wearer's abdominal circumference. The ratio (S1 / S2) is preferably 4.8 or less, more preferably 4.6 or less, and even more preferably 4.4 or less, from the viewpoint of preventing tightness around the wearer's abdominal circumference. In addition, in the above relationship, the ratio (S3 / S1) of the tensile stress (S3) in the lower region 83 to the tensile stress (S1) in the lower end connection region 3 is preferably 1.2 or more, more preferably 1.3 or more, and even more preferably 1.4 or more, from the viewpoint of conforming to the body shape when worn. The ratio (S3 / S1) is preferably 5.8 or less, more preferably 5.7 or less, and even more preferably 5.6 or less, from the viewpoint of suppressing tightness around the waist of the wearer.

[0048] The position of the lower end connection region 3 in the body length direction Y is preferably within a range of 20% or less, and more preferably within a range of 18% or less, from the crotch side edge of the waist joint 11 with respect to the length in the body length direction Y corresponding to the waist joints 11, 11 of the back side exterior body 22. At this position in the body length direction Y, the lower end connection region 3 is a region that connects the waist joints 11, 11 in the waist circumference direction.

[0049] In the crotch side extension portion 8, it is preferable to increase the rigidity of the lower region 83 more than that of the upper region 82 by controlling the adhesive applied to the elastic body 7 as described below. This, together with the configuration of the rigid portion 4 extending in the body length direction Y, further enhances the suppression effect against the rolling up of the outer peripheral edge of the crotch side extension portion 8.

[0050] Specifically, it is preferable that the basis weight of the adhesive in the elastic body 73 disposed in the lower region 83 is greater than the basis weight of the adhesive in the elastic body 72 disposed in the upper region 82 . The adhesive basis weight refers to the average basis weight of the adhesive attached to the elastic bodies 72 and 73 in the upper region 82 and the lower region 83. The basis weight is the amount of adhesive (coated basis weight) applied to fix the elastic bodies 7 (72, 73) to the outer layer sheet 63 and the inner layer sheet 64.

[0051] (Method for measuring adhesive basis weight) The elastic body 7, outer layer sheet 63, inner layer sheet 64, and area containing adhesive are cut out, and the weight of each sheet is measured. The adhesive is then removed with a solvent or the like, and the weight is measured again. The basis weight of the adhesive can be calculated from the difference and the applied area.

[0052] The ratio (B3 / B2) of the adhesive basis weight (B3) of the elastic body 73 disposed in the lower region 83 to the adhesive basis weight (B2) of the elastic body 72 disposed in the upper region 82 is preferably 1.1 or more, more preferably 1.2 or more, and even more preferably 1.3 or more, from the viewpoint of further enhancing the rolling-up suppression effect of the crotch extension portion 8. Moreover, the ratio (B3 / B2) is preferably 2.0 or less, more preferably 1.8 or less, and even more preferably 1.6 or less, from the viewpoint of suppressing deterioration in texture.

[0053] Another example of an embodiment in which the adhesive can be used to increase the rigidity of the lower region 83 more than that of the upper region 82 is to apply different adhesive patterns to the elastic bodies 73 arranged in the lower region 83 and the elastic bodies 72 arranged in the upper region 82. For example, a spiral adhesive pattern can be applied to the elastic bodies 72, and a pattern in which the adhesive is applied continuously along the extension direction of the elastic bodies 73 (a comb solid adhesive pattern) can be applied. This increases the bonding area of ​​the lower region 83 compared to the upper region, thereby increasing the rigidity. Here, the comb solid coating pattern refers to a pattern in which adhesive is continuously applied to the outer periphery of the elastic body 7. Comb solid coating can be achieved by using a comb gun. In this case, the elastic body 7 is preferably bonded between the joint between the outer layer sheet 63 and the inner layer sheet 64 with a comb gun-type adhesive layer. This makes it possible to form an adhesive layer in which adhesive is applied only to the area where the elastic body 7 is present. Such an adhesive layer can reduce the area of ​​the joint between the outer layer sheet 63 and the inner layer sheet 64 at the position where the elastic body 7 is arranged. As described above, different application patterns can be achieved by using different adhesive application methods in the upper region 82 and the lower region 83. Examples of application methods include spiral application, intermittent application, and solid application. It is also possible to use the same adhesive application method but with different application patterns. For example, by selecting one of spiral application, intermittent application, solid application, etc. and varying the adhesive application pitch, intermittent application, or basis weight in the upper region 82 and the lower region 83, different application patterns can be achieved.

[0054] A preferred embodiment of the relationship between the rigid portion 4 and the region other than the rigid portion 4 in the crotch extension portion 8 will be described.

[0055] In the region 8P of the crotch side extension portion 8 that does not overlap with the absorbent main body 1, the region other than the rigid portion 4 (the region of the crotch side extension portion 8 excluding the rigid portion 4) is preferably made to have lower rigidity than the rigid portion 4. This makes it less likely to roll up when the wearer moves their legs.

[0056] In the region 8P of the crotch extension portion 8 that does not overlap with the absorbent main body 1, it is preferable that the relationship of the difference in rigidity of the upper portion 47 excluding the high rigidity portion 48 in the rigid portion 4 exists in the region other than the rigid portion. This can prevent rolling up.

[0057] The rigidity of the above-mentioned region other than the rigid portion can be measured by the same method as that for the rigid portion 4.

[0058] Furthermore, in the crotch extension portion 8, it is preferable that the above-mentioned upper region 82 corresponds to the upper portion 47 excluding the high rigidity portion 48 of the rigid portion 4, and the lower region 83 corresponds to the high rigidity portion 48. This allows the above-mentioned effects of the combination of the upper region 82, the lower region 83, and the rigid portion 4 to be more effectively exerted.

[0059] In the region 8P of the crotch extension portion 8 that does not overlap with the absorbent body 1, it is preferable that the ratio of the rigidity (K3) of the high rigidity portion 48 in the rigid portion 4 to the rigidity (K1) of the upper portion 47 excluding the high rigidity portion 48 is smaller than the ratio (S3 / S2) of the elongation stress (S3) due to the elastic body 73 in the lower region 83 to the elongation stress (S2) due to the elastic body 72 in the upper region 82 in the region other than the rigid portion 4. Specifically, the difference between the ratio (K3 / K1) and the ratio (S3 / S2) is preferably 0.1 or more, more preferably 0.2 or more, and even more preferably 0.3 or more. The difference between the ratio (K3 / K1) and the ratio (S3 / S2) is preferably 4 or less, more preferably 3.9 or less, and even more preferably 3.8 or less. This prevents the texture of the waist and leg edges from being compromised and the garment from rolling up when worn.

[0060] In the crotch side extension portion 8, it is preferable that the number of sheets of nonwoven fabric constituting the crotch side extension portion 8 is greater in the lower region 83 than in the upper region 82. This prevents rolling up. The difference (N3-N2) between the number of nonwoven fabrics (N3) in the lower region 83 and the number of nonwoven fabrics (N2) in the upper region 82 is preferably 1 or more, more preferably 2 or more, and even more preferably 3 or more. From the viewpoint of comfort, the difference (N3-N2) is preferably 6 or less, more preferably 5 or less, and even more preferably 4 or less.

[0061] Furthermore, from the viewpoint of improving the feel against the wearer's skin, it is preferable that the crotch side extension portion 8 is an extension portion of the back side outer body 22, and that the extension portion of the back side outer body 22 is folded and joined and fixed at the crotch side edge of the lower region 83.

[0062] Next, a preferred embodiment of the absorbent main body 1 will be described.

[0063] The basis weight of the absorber 16 included in the absorbent main body 1 is preferably greater in the ventral side portion 10F than in the dorsal side portion 10R. The ratio (M2 / M1) of the basis weight (M2) of the absorbent body 16 at the ventral portion 10F to the basis weight (M1) of the absorbent body 16 at the dorsal portion 10R is preferably 1.1 or more, more preferably 1.3 or more, and even more preferably 1.5 or more. From the viewpoint of reducing the product thickness, the ratio (M2 / M1) is preferably 2.5 or less, more preferably 2.3 or less, and even more preferably 2.1 or less.

[0064] The outer layer sheet 63 constituting the back-side exterior body 22 is made of a nonwoven fabric, and the rigidity of this nonwoven fabric is preferably 10 mN or more and 65 mN or less. By using such a soft or flexible nonwoven fabric for the outer layer sheet 63, the back-side exterior body 22 can be given softness due to the stretchability of the elastic body 7. The rigidity of the nonwoven fabric constituting the outer layer sheet 63 means the bending resistance measured by the handle-ometer method specified in JIS L 1913: 2010. From the viewpoint of not suppressing the elongation stress of the elastic body, the rigidity of the nonwoven fabric constituting the outer layer sheet 63 is preferably 10 mN or more, more preferably 15 mN or more, and is preferably 70 mN or less, more preferably 65 mN or less.

[0065] In the pants-type wearing article of the present invention, as long as it has the above-mentioned crotch side extension portion 8 and the above-mentioned function of the crotch side extension portion 8 can be achieved, the configurations of the back side outer body 22, the absorbent main body 1, and the ventral side outer body 21 are not limited to those shown in the above-mentioned diaper 10, but can be in various commonly available forms.

[0066] The components constituting the diaper 10 can be formed using various materials used in this type of article. For example, the materials for the outer layer sheets 61, 63 and the inner layer sheets 62, 64 that make up the exterior body 2 can be nonwoven fabrics, woven fabrics, knitted fabrics, resin films, and the like, produced by various manufacturing methods, such as through-air nonwoven fabrics, heat-rolled nonwoven fabrics, spunlace nonwoven fabrics, spunbond nonwoven fabrics, and meltblown nonwoven fabrics. Sheet materials formed by laminating these materials together can also be used. Various materials can be used. For example, synthetic fibers made of polyethylene, polypropylene, polyester, or other thermoplastic resins can be used. The inner sheets 62, 64 are preferably made of nonwoven fabric from the viewpoint of improving breathability and texture, and are preferably made of water-repellent nonwoven fabric from the viewpoint of preventing leakage of excrement.

[0067] The various elastic materials mentioned above can be ordinary elastic materials used in wearable articles such as diapers and sanitary napkins. Examples of materials include synthetic rubbers such as styrene-butadiene, butadiene, isoprene, and neoprene, natural rubber, EVA, elastic polyolefins, and polyurethanes. The elastic materials can be in the form of threads or strings (such as flat rubber) with cross sections that are rectangular, square, circular, or polygonal, or multifilament threads.

[0068] Furthermore, the absorbent body 1 can be made of any material that is normally used for this type of diaper, without any particular restrictions.

[0069] The pants-type wearing article of the present invention is not limited to the embodiment of the diaper 10 described above, but is a concept that includes various articles having a pants-type structure. The pants-type wearing article of the present invention may be for infants or adults, and may be in a form other than a diaper. For example, the pants-type wearing article may be in a form other than a diaper, such as sanitary shorts, shorts-type napkins, or disposable shorts. Furthermore, the pants-type wearing article is not limited to those having an absorbent main body like the pants-type wearing article 10 described above, but may also be a diaper cover or underwear without an absorbent main body.

[0070] In relation to the above-described embodiment, the present invention further discloses the following pants-type wearing article.

[0071] <1> A pants-type wearing article having a ventral side portion arranged on the ventral side of a wearer, a crotch portion arranged on the crotch side, and a dorsal side portion arranged on the dorsal side, and having a waist circumference direction and a body length direction, The pants-type wearing article comprises a pair of waist joints formed by joining a back outer body constituting an outer surface main body of the back side portion and a ventral outer body constituting an outer surface main body of the ventral side portion at their ends in the waist direction, and an absorbent main body fixed so as to bridge between the back outer body and the ventral outer body, A crotch side extension extending from the back exterior body is disposed closer to the crotch portion than the position of the waist joint, and a plurality of elastic bodies extending along the waist circumference direction and arranged at intervals along the body length direction are joined to the crotch side extension in a stretched state so as to be stretchable and contractible, the crotch-side extension portion has a lower region in which the elongation stress in the waist-circumferential direction caused by the elastic body is greater than that in an upper region in the body length direction, and has a rigid portion extending along the body length direction, the rigid portion having a high-rigidity portion at a lower position within the rigid portion that has a relatively high rigidity.

[0072] <2> The rigid portion is provided at an end portion of the crotch side extension portion in a waist circumference direction. <1> The pants-type wearing article according to claim 1. <3> In the crotch side extension portion, the elastic body disposed in the lower region has a higher elongation rate than the elastic body disposed in the upper region. <1> or <2> The underwear-type wearing article according to claim 1. <4> In the crotch extension portion, the thickness of the elastic body arranged in the lower region is greater than the thickness of the elastic body arranged in the upper region. <1> ~ <3> 10. The pants-type wearing article according to claim 1, <5> In the crotch side extension portion, the adhesive length of the elastic body arranged in the lower region is longer than the adhesive length of the elastic body arranged in the upper region. <1> ~ <4> 10. The pants-type wearing article according to claim 1, <6> A plurality of elastic bodies extending along the waist circumference direction and arranged at intervals along the body length direction are joined to the back exterior body at the position of the waist joint portion in a stretched state so as to be stretchable and contractible, When the elongation stress caused by the elastic body in the lower end connection region of the back side exterior body adjacent to the upper region of the crotch side extension is (S1), the elongation stress caused by the elastic body in the upper region of the crotch side extension is (S2), and the elongation stress caused by the elastic body in the lower region of the crotch side extension is (S3), the relationship in magnitude of the elongation stresses is (S2)<(S1)<(S3). <1> ~ <5> 10. The pants-type wearing article according to claim 1, <7> In the crotch extension portion, the basis weight of the adhesive in the elastic body disposed in the lower region is greater than the basis weight of the adhesive in the elastic body disposed in the upper region. <1> ~ <6> 10. The pants-type wearing article according to claim 1, <8> In the crotch extension portion, the adhesive application pattern is different between the elastic body arranged in the lower region and the elastic body arranged in the upper region. <1> ~ <8> 10. The pants-type wearing article according to claim 1, <9> the area of ​​the rigid portion is larger in the front high rigidity portion than in an upper portion excluding the high rigidity portion; <1> ~ <8> 10. The pants-type wearing article according to claim 1, <10> the rigid portion is an assembly of a plurality of structural portions, and the number of the structural portions is greater in the high rigidity portion than in an upper portion excluding the high rigidity portion; <1> ~ <9> 10. The pants-type wearing article according to claim 1, <11> In the region of the crotch side extension portion that does not overlap with the absorbent main body, the region other than the rigid portion has a lower rigidity than the rigid portion. <1> ~ <10> 10. The pants-type wearing article according to claim 1, <12> In the region of the crotch side extension portion that does not overlap with the absorbent main body, a relationship of difference in rigidity in the rigid portion, such that an upper portion excluding the high rigidity portion is smaller than the high rigidity portion, exists in the region other than the rigid portion. <1> ~ <11> 10. The pants-type wearing article according to claim 1, <13> In the crotch extension portion, the upper region corresponds to an upper portion of the rigid portion excluding the high rigidity portion, and the lower region corresponds to the high rigidity portion. <1> ~ <12> 10. The pants-type wearing article according to claim 1, <14> In the region of the crotch side extension portion that does not overlap with the absorbent main body, the ratio of the rigidity of the high rigidity portion to the rigidity of the upper portion excluding the high rigidity portion in the rigid portion is smaller than the ratio of the elongation stress caused by the elastic body in the lower region to the elongation stress caused by the elastic body in the upper region in the region other than the rigid portion. <1> ~ <13> 10. The pants-type wearing article according to claim 1, <15> In the crotch side extension portion, the number of nonwoven fabric sheets constituting the crotch side extension portion is greater in the lower region than in the upper region. <1> ~ <14> 10. The pants-type wearing article according to claim 1, <16> The crotch-side extension is an extension of the back-side exterior body, and the extension of the back-side exterior body is folded and joined and fixed at an edge of the crotch side of the lower region. <1> ~ <15> 10. The pants-type wearing article according to claim 1, <17> The basis weight of the absorbent body included in the absorbent main body is larger in the ventral side portion than in the dorsal side portion. <1> ~ <16> 10. The pants-type wearing article according to claim 1, <18> The outer layer sheet constituting the rear exterior body is made of a nonwoven fabric, and the rigidity of the nonwoven fabric is 10 mN or more and 65 mN or less. <1> ~ <17> 10. The pants-type wearing article according to claim 1, [Explanation of symbols]

[0073] 1 absorbent body 2. Exterior body 21 Ventral exterior 22 Dorsal exterior body 3 Bottom connection area 4 Rigid part 41, 42 Structural section 47 Rigidity area other than high rigidity area (upper part) 48 High rigidity part 5 Elastic body (arranged on the back exterior body) 51 Elastic body arranged in the lower end connection region (of the back exterior body) 61 Outer layer sheet 62 Inner layer sheet 63 Outer layer sheet 64 Inner layer sheet 7 Elastic Body 72 Elastic body in the upper region of the crotch extension 73 Elastic body in the lower region of the crotch extension 8 Crotch side extension 81 Folds 82 Upper region of the crotch extension 83 Lower region of the groin 10. Diapers 10F Abdominal part of diaper 10C Diaper crotch 10R Back side of diaper 10D Diaper Body Zhou Ribu 11 Waist joint 12 Waist opening 13 Leg opening 16 Absorbent Y Length direction of the diaper (or longitudinal direction of the absorbent body) X: Around the waist of the diaper (or across the width of the absorbent body)

Claims

1. A pants-type wearing article having a ventral side portion arranged on the ventral side of a wearer, a crotch portion arranged on the crotch side, and a dorsal side portion arranged on the dorsal side, and having a waist circumference direction and a body length direction, The pants-type wearing article comprises a pair of waist joints formed by joining a back outer body constituting an outer surface main body of the back side portion and a ventral outer body constituting an outer surface main body of the ventral side portion at their ends in the waist direction, and an absorbent main body fixed so as to bridge between the back outer body and the ventral outer body, A plurality of elastic bodies extending along the waist circumference direction and arranged at intervals along the body length direction are joined to the back exterior body at the position of the waist joint portion in a stretched state so as to be stretchable and contractible, A crotch side extension extending from the back exterior body is disposed closer to the crotch portion than the position of the waist joint, and a plurality of elastic bodies extending along the waist circumference direction and arranged at intervals along the body length direction are joined to the crotch side extension in a stretched state so as to be stretchable and contractible, the crotch side extension portion has a lower region in which the elongation stress in the waist-circumferential direction caused by the elastic body is greater than that in an upper region in the body length direction, and has a rigid portion extending along the body length direction, the rigid portion having a high rigidity portion at a lower position, the high rigidity portion having a relatively high rigidity within the rigid portion; A pants-type wearing article in which the relationship between the magnitude of the respective elongation stresses is (S2) < (S1) < (S3), where the elongation stress due to the elastic body in the lower end connection region of the back outer body adjacent to the upper region of the crotch side extension is (S1), the elongation stress due to the elastic body in the upper region of the crotch side extension is (S2), and the elongation stress due to the elastic body in the lower region of the crotch side extension is (S3).

2. 2. The pants-type wearing article according to claim 1, wherein the rigid portion is provided at an end portion of the crotch side extension portion in the waist-circumferential direction.

3. 3. The pants-type wearing article according to claim 1, wherein the elastic body disposed in the lower region of the crotch-side extension portion has a higher elongation rate than the elastic body disposed in the upper region.

4. 4. The pants-type wearing article according to claim 1, wherein, in the crotch side extension portion, the thickness of the elastic body arranged in the lower region is greater than the thickness of the elastic body arranged in the upper region.

5. 5. The pants-type wearing article according to claim 1, wherein, in the crotch-side extension portion, an adhesive length of the elastic body arranged in the lower region is longer than an adhesive length of the elastic body arranged in the upper region.

6. 6. The pants-type wearing article according to claim 1, wherein, in the crotch side extension portion, the basis weight of the adhesive in the elastic body disposed in the lower region is greater than the basis weight of the adhesive in the elastic body disposed in the upper region.

7. 7. The pants-type wearing article according to claim 1, wherein, in the crotch-side extension portion, the adhesive application pattern of the elastic body disposed in the lower region is different from that of the elastic body disposed in the upper region.

8. 8. The pants-type wearing article according to claim 1, wherein the area of ​​the high-rigidity portion is larger than that of an upper portion excluding the high-rigidity portion.

9. 9. The pants-type wearing article according to claim 1, wherein the rigid portion is an aggregate of a plurality of structural portions, and the number of the structural portions is greater in the high-rigidity portion than in an upper portion excluding the high-rigidity portion.

10. The pants-type wearing article according to any one of claims 1 to 9, wherein in a region of the crotch side extension portion that does not overlap with the absorbent main body, a region other than the rigid portion has a lower rigidity than the rigid portion.

11. 11. The pants-type wearing article according to claim 1, wherein in a region of the crotch side extension portion that does not overlap with the absorbent main body, a relationship of difference in rigidity in the rigid portion, such that an upper portion excluding the high rigidity portion is smaller than the high rigidity portion, exists in a region other than the rigid portion.

12. 12. The pants-type wearing article according to claim 1, wherein in the crotch side extension portion, the upper region corresponds to an upper portion of the rigid portion excluding the high rigidity portion, and the lower region corresponds to the high rigidity portion.

13. 13. The pants-type wearing article according to claim 1, wherein in a region of the crotch side extension portion that does not overlap with the absorbent main body, a ratio of the rigidity of the high rigidity portion in the rigid portion to the rigidity of an upper portion excluding the high rigidity portion is smaller than a ratio of the elongation stress caused by the elastic body in the lower region to the elongation stress caused by the elastic body in the upper region in a region other than the rigid portion.

14. The pants-type wearing article according to any one of claims 1 to 13, wherein the number of sheets of nonwoven fabric constituting the crotch side extension portion is greater in the lower region than in the upper region.

15. The pants-type wearing article according to any one of claims 1 to 14, wherein the crotch-side extension portion is an extension portion of the back-side outer body, and the extension portion of the back-side outer body is folded and joined and fixed at an edge on the crotch side of the lower region.

16. The pants-type wearing article according to any one of claims 1 to 15, wherein the basis weight of the absorbent body included in the absorber is greater in the ventral portion than in the dorsal portion.

17. 17. The pants-type wearing article according to claim 1, wherein the outer layer sheet constituting the rear-side outer body is made of a nonwoven fabric, and the rigidity of the nonwoven fabric is 10 mN or more and 65 mN or less.

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