Pants-type absorbent article

Abstract

To provide an underpants type absorbent article in which a peripheral edge of a waist opening part is arranged in an appropriate position when wearing, and which is excellent in fit.SOLUTION: An underpants type absorbent article 1 is such that: a narrowest part 3g having a shortest length in a lateral direction Y in an exterior body 3 is positioned at an abdominal side part A side from a longitudinal direction center line Lx dividing a full length in a longitudinal direction X of an exterior body 3 into two, and extending in the lateral direction Y; the exterior body 3 has, at least in a crotch part C, a longitudinal direction stretchable region in which a longitudinal direction stretchable sheet 42 stretching in the longitudinal direction X is arranged; and in the longitudinal direction stretchable sheet 42, a part at the abdominal side part A side from the longitudinal direction center line Lx has a longer length in the longitudinal direction X compared to a part at a back side part B side from the longitudinal direction center line Lx, and a center position 42c in the longitudinal direction X of the longitudinal direction stretchable sheet 42 and a center position 2c in the longitudinal direction X of an absorbent body 2 coincide with each other.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a pant-type absorbent article. [Background technology]

[0002] Conventionally, there is known a pants-type absorbent article having a ventral part arranged on the ventral side of a wearer, a dorsal part arranged on the dorsal side of a wearer, a crotch part located between the ventral part and the dorsal part, and in which a pair of side seal parts, a waist opening and a pair of leg openings are formed (see Patent Documents 1 and 2). In such pants-type absorbent articles, in consideration of the fact that the skin of the buttocks stretches when the wearer of the absorbent article moves, for example, when the wearer sits or walks, the narrowest part, which has the narrowest width in the exterior body, is arranged closer to the ventral part in order to make the vertical length of the dorsal part of the exterior body longer than the vertical length of the ventral part. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-118554 A [Patent Document 2] JP 2016-67511 A Summary of the Invention [Problem to be solved by the invention]

[0004] When the absorbent article is worn, the wearer's legs fit into the portion of the absorbent article that corresponds to the narrowest portion, so if the narrowest portion is located closer to the ventral side, the position of the periphery of the waist opening may be lower in the ventral side than in the dorsal side when the absorbent article is worn naturally. In contrast, if the narrowest portion is located closer to the dorsal side, the area of ​​the portion of the outer body that covers the wearer's buttocks becomes relatively smaller, resulting in poor fit. Therefore, an object of the present invention is to provide an absorbent article that can overcome the above-mentioned drawbacks of the conventional techniques. [Means for solving the problem]

[0005] The present invention provides a diaper absorbing material comprising an absorbent body and an exterior body disposed on a non-skin facing side of the absorbent body, The present invention relates to a pants-type absorbent article having a ventral portion arranged on the ventral side of a wearer, a dorsal portion arranged on the dorsal side of the wearer, and a crotch portion located between the ventral portion and the dorsal portion, and in which a pair of side seal portions, a waist opening, and a pair of leg openings are formed. The pants-type absorbent article has a longitudinal direction corresponding to the front-to-back direction of a wearer and a lateral direction perpendicular to the longitudinal direction. In the pants-type absorbent article, the narrowest part of the outer body, which has the shortest horizontal length, is located on the abdominal side of the vertical center line that bisects the entire vertical length of the outer body and extends in the horizontal direction. The exterior body has a vertically stretchable region in at least the crotch portion, in which a vertically stretchable sheet that stretches in the vertical direction is disposed. The longitudinally stretchable sheet has a portion closer to the ventral side than the longitudinal center line, the portion being longer in the longitudinal direction than the portion closer to the dorsal side than the longitudinal center line. The longitudinal center position of the longitudinally-elastic sheet coincides with the longitudinal center position of the absorbent body. Effect of the Invention

[0006] According to the present invention, it is possible to provide a pants-type absorbent article which, when worn, has a peripheral edge of a waist opening disposed at an appropriate position and has an excellent fit. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a developed plan view that shows a schematic view of the skin-facing surface (inner surface) side of a pants-type disposable diaper, which is one embodiment of a pants-type absorbent article of the present invention, in a developed and stretched state. [Diagram 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Diagram 3]FIG. 3 is a side view showing the diaper shown in FIG. 1 in a worn state. [Figure 4] FIG. 4 is a partially cutaway perspective view showing a schematic example of a stretch sheet for the diaper shown in FIG. [Diagram 5] FIG. 5 is a developed plan view that typically shows the skin-facing surface (inner surface) side of a pants-type disposable diaper, which is another embodiment of the pants-type absorbent article of the present invention, in an unfolded and stretched state. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] The present invention will now be described based on its preferred embodiments. 1 to 3 show a pants-type disposable diaper (hereinafter, referred to as "diaper") 1, which is one embodiment of the pants-type absorbent article of the present invention. As shown in Figs. 1 to 3, the diaper 1 comprises a ventral side portion A that is arranged on the ventral side of a wearer when worn, a dorsal side portion B that is arranged on the dorsal side of the wearer, and a crotch portion C located therebetween. The diaper 1 also has a longitudinal direction X that corresponds to the front-to-rear direction of the wearer, and a lateral direction Y that is perpendicular to the longitudinal direction X. The longitudinal direction X is a direction that extends from the ventral side portion A through the crotch portion C to the dorsal side portion B.

[0009] 1 to 3, the diaper 1 includes an absorbent main body 2 and an exterior body 3 arranged on the non-skin-facing side of the absorbent main body 2. The exterior body 3 includes a ventral side exterior body 3A arranged in the ventral side portion A, a rear side exterior body 3B arranged in the rear side portion B, and a crotch exterior body 3C arranged in the crotch portion C.

[0010] The diaper 1 has both side portions 3e, 3e of the ventral exterior body 3A extending in the longitudinal direction X and both side portions 3f, 3f of the rear exterior body 3B extending in the longitudinal direction X joined together to form a pair of side seal portions S, S, a waist opening WH, and a pair of leg openings LH, LH. The diaper 1 also has a waist portion D in which the ventral portion A and the rear portion B are connected in a cylindrical shape.

[0011] As shown in FIG. 1, the absorbent body 2 has a rectangular shape in a plan view, and is positioned in the center of the exterior body 3 in the lateral direction Y with its longitudinal direction aligned with the longitudinal direction X of the diaper 1, and extends in the longitudinal direction X from the abdominal side portion A through the crotch portion C to the dorsal side portion B. As shown in FIG. 2, the absorbent body 2 has an absorbent body 23, a top sheet 21 arranged on the skin-facing side of the absorbent body 23, and a back sheet 22 arranged on the non-skin-facing side of the absorbent body 23. The absorbent body 23 has a shape that is elongated in the longitudinal direction X of the diaper 1, similar to the absorbent main body 2, and is disposed between the top sheet 21 and the back sheet 22. The top sheet 21, absorbent body 23 and back sheet 22 are integrated together by known joining means such as adhesion with an adhesive or fusion bonding.

[0012] The "skin-facing side", when focusing on the diaper 1 or its constituent members (e.g., absorbent body 23), is the side that faces the wearer's skin when the diaper 1 is worn, and the "non-skin-facing side" is the side that faces away from the wearer's skin when the diaper 1 is worn. Furthermore, "when worn" and "worn state" refer to a state in which the diaper 1 is worn while being maintained in the correct wearing position.

[0013] As described above, the exterior body 3 includes a ventral side exterior body 3A, a rear side exterior body 3B, and a crotch exterior body 3C. In this embodiment, the multiple exterior bodies 3A to 3C are connected to each other in the vertical direction X to form an exterior body 3 having a single continuous shape. The exterior body 3 has a larger area than the absorbent main body 2 and extends outward from the periphery of the absorbent main body 2. In the plan view of the diaper 1 in the unfolded and stretched state as shown in FIG. 1, the central part of the exterior body 3 in the vertical direction X including the crotch exterior body 3C is narrowed, and the exterior body 3 as a whole has an hourglass shape. The narrowest part 3g, which has the shortest length in the horizontal direction Y of the exterior body 3, is located on the abdominal side A side of the vertical center line Lx that bisects the entire length L of the exterior body 3 in the vertical direction X and extends in the horizontal direction Y.

[0014] In the embodiment shown in Fig. 1, the ventral exterior body 3A and the dorsal exterior body 3B have an outer layer sheet 32, an inner layer sheet 31 arranged on the skin-facing side of the outer layer sheet 32, and a plurality of thread-like or band-like elastic members 33 arranged between the two sheets 31, 32. The elastic members 33 are fixed to the sheets that constitute the exterior body 3 in a stretched state. The elastic members 33 include waist elastic members 33w arranged along the lateral direction Y at the peripheral edge WE of the waist opening WH. The exterior body 3 has a vertically stretchable region 41 at least in the crotch part C. The vertically stretchable region 41 extends over the entire thickness of the exterior body 3. A vertically stretchable sheet 42 that stretches in the vertical direction X is disposed in the vertically stretchable region 41. The vertically stretchable sheet 42 may have a portion overlapping with another member that does not inhibit the stretchability in the vertical direction X. In this embodiment, the crotch exterior body 3C is formed by the vertically stretchable sheet 42. An inner layer sheet 31 may be laminated on the skin-facing side of the vertically stretchable sheet 42. It is preferable that the inner layer sheet 31 is a sheet that does not inhibit the stretching of the vertically stretchable sheet 42.

[0015] In the diaper 1, the portion 42A of the longitudinally stretchable sheet 42 located on the ventral portion A side of the longitudinal centerline Lx is longer in the longitudinal direction X than the portion 42B of the ventral portion B side of the longitudinal centerline Lx. The advantages of doing so are as follows. As described above, the narrowest portion 3g of the diaper 1 is located on the ventral portion A side of the longitudinal centerline Lx. As a result, the length of the outer cover 3 in the longitudinal direction X is longer on the ventral portion B side than on the ventral portion A side, and the area of ​​the ventral portion B covering the buttocks of the wearer is relatively large, improving the fit of the diaper 1. In a conventional diaper, when the narrowest portion 3g is located on the ventral portion A side of the longitudinal centerline Lx, the position of the periphery WS of the waist opening WH may be lower in the ventral portion A than in the ventral portion B when the diaper is worn, as shown in FIG. 3. In contrast, in the diaper 1 of this embodiment, a portion 42A of the longitudinally stretchable sheet 42 on the ventral portion A side of the longitudinal centerline Lx is longer in the longitudinal direction X than a portion 42B on the dorsal portion B side, so that the longitudinally stretchable sheet 42 stretches in the longitudinal direction X, pulling the exterior body 3 as a whole toward the ventral portion A. This prevents the position of the periphery WE of the waist opening WH from being lower in the ventral portion A than in the dorsal portion B, and allows the periphery WE of the waist opening WH to be positioned appropriately. Thus, according to the diaper 1 of the present embodiment, the peripheral edge of the waist opening WH is positioned appropriately, and the diaper 1 has an excellent fit.

[0016] In order to make the above-mentioned effects more pronounced, the length La in the longitudinal direction X of the portion 42A of the longitudinally stretchable sheet 42 on the ventral side A side of the longitudinal centerline Lx is preferably at least 1.2 times, more preferably at least 1.3 times, and preferably at most 2.0 times, more preferably at most 1.5 times, the length Lb in the longitudinal direction X of the portion 42B of the longitudinally stretchable sheet 42 on the dorsal side B side of the longitudinal centerline Lx.

[0017] In the diaper 1, the center position 42c in the longitudinal direction X of the longitudinal stretchable sheet 42 coincides with the center position 2c in the longitudinal direction X of the absorbent main body 2. As a result, even if the longitudinal stretchable sheet 42 stretches, the relative position of the center position 42c in the longitudinal direction X of the absorbent main body 2 with respect to the exterior body 3 is unlikely to shift, so that when the diaper 1 is worn, the absorbent main body 2 can be positioned in an appropriate position, further improving the fit of the diaper 1. Here, the center position 42c in the longitudinal direction X of the longitudinal stretchable sheet 42 coincides with the center position 2c in the longitudinal direction X of the absorbent main body 2 means that the distance between the center position 42c in the longitudinal direction X of the longitudinal stretchable sheet 42 and the center position 2c in the longitudinal direction X of the absorbent main body 2 is within 10% of the overall length of the absorbent main body 2, preferably within 5%.

[0018] It is preferable that the longitudinally stretchable sheet 42 has the same length in the longitudinal direction X as the absorbent body 2. This prevents the stretching force of the longitudinally stretchable sheet 42 from decreasing, and makes the effect of stretching the longitudinally stretchable sheet 42 more remarkable. It also prevents the exterior body 3 from shrinking alone, causing wrinkles in the exterior body 3 and causing the wearer to feel uncomfortable. Here, the length L3 in the longitudinal direction X of the longitudinally stretchable sheet 42 being the same as the length L2 in the longitudinal direction X of the absorbent body 2 includes not only the case where the length L3 and the length L2 are completely the same, but also the case where the length L3 and the length L2 are approximately the same.

[0019] The ratio L3 / L2 of the length L3 in the longitudinal direction X of the longitudinally-stretchable sheet 42 to the length L2 in the longitudinal direction X of the absorbent main body 2 is preferably 0.5 or more, and more preferably 0.9 or more, from the viewpoint of making the effect of the stretching of the longitudinally-stretchable sheet 42 more pronounced; from the viewpoint of preventing only the outer body 3 from shrinking and causing wrinkles in the outer body 3, which would cause the wearer to feel discomfort, the ratio is preferably 1.4 or less, and more preferably 1.1 or less; and from the viewpoint of achieving both, the ratio is preferably 0.5 or more and 1.4 or less, and more preferably 0.9 or more and 1.1 or less.

[0020] It is preferable that the length D3 in the lateral direction Y of the longitudinally stretchable sheet 42 is equal to or greater than the length D2 in the lateral direction Y of the absorbent body 2. This prevents the stretching force of the longitudinally stretchable sheet 42 from decreasing, and makes the effect of the stretching of the longitudinally stretchable sheet 42 even more pronounced. From a similar viewpoint, the ratio D3 / D2 of the length D3 to the length D2 is preferably 1.0 or more, more preferably 1.2 or more, and is preferably 2.0 or less, more preferably 1.5 or less, and is preferably 1.0 or more and 2.0 or less, and more preferably 1.2 or more and 1.5 or less.

[0021] The diaper 1 has a waist portion D in which a ventral portion A and a rear portion B are connected in a tubular shape. In the embodiment, the waist portion D is formed by joining both side portions 3e, 3e of the ventral exterior body 3A and both side portions 3f, 3f of the rear exterior body 3B. In the longitudinal direction X, the end 42a of the longitudinally stretchable sheet 42 on the abdominal portion A side preferably reaches the waist circumference portion D of the abdominal portion A. This further increases the length La of the portion 42A on the abdominal portion A side of the longitudinally stretchable sheet 42, which further prevents the position of the periphery WE of the waist opening WH from being lower in the abdominal portion A than in the back portion B. From the viewpoint of achieving this effect more significantly, the ratio L4 / L3 of the length L4 of the portion where the longitudinally stretchable sheet 42 and the waist circumference portion D of the abdominal portion A overlap in the longitudinal direction X to the length L3 of the longitudinally stretchable sheet 42 is preferably 0 or more, more preferably 0.1 or more, and also preferably 0.5 or less, more preferably 0.2 or less, and also preferably 0 or more and 0.5 or less, more preferably 0.1 or more and 0.2 or less.

[0022] It is preferable that the end 42b of the longitudinally stretchable sheet 42 on the side of the back portion B does not reach the waist portion D of the back portion B. This can prevent unnecessary wrinkles from occurring in the waist portion D of the back portion B, improving the wearing comfort of the diaper 1.

[0023] In the diaper 1, as described above, the crotch outer body 3C includes the longitudinally stretchable sheet 42. The ventral outer body 3A and the rear outer body 3B preferably include laterally stretchable sheets that stretch in the lateral direction. In the diaper 1, the outer layer sheet 32 ​​is the laterally stretchable sheet 32. As shown in FIG. 4, the laterally stretchable sheet 32 ​​and the longitudinally stretchable sheet 42 are stretchable sheets in which elastic filaments 53 arranged to extend in the longitudinal direction X or the lateral direction Y are bonded between two nonwoven fabrics 51, 52. The two fiber sheets 51, 52 are stretchable in the longitudinal direction X or the lateral direction Y.

[0024] The laterally stretchable sheet 32 ​​and the longitudinally stretchable sheet 42 having the above-mentioned configuration can be manufactured, for example, according to the method described in JP-A-2009-61743. Specifically, for example, while taking up and stretching a plurality of molten elastic filaments 53 spun out from a spinning nozzle at a predetermined speed, the elastic filaments 53 are fused to fiber sheets 51, 52 before solidification so that the elastic filaments 53 are arranged in one direction without crossing each other, and then both sheets 51, 52 to which the elastic filaments 53 are fused are stretched along the direction in which the elastic filaments 53 extend, thereby manufacturing the laterally stretchable sheet 32 ​​or the longitudinally stretchable sheet 42. The laterally stretchable sheet 32 ​​is entirely stretchable in the transverse direction Y, and the longitudinally stretchable sheet 42 is entirely stretchable in the longitudinal direction X. By using the above-mentioned stretchable sheets for each of the laterally stretchable sheet 32 ​​and the longitudinally stretchable sheet 42, the diaper 1 can be given a fitting feel that is similar to that of underwear. The elastic filament 53 differs from the thread-like or band-like elastic member 33 arranged at the waist opening WH in that it is fixed in a substantially unstretched state and in that the cross-sectional area perpendicular to the longitudinal direction is smaller than that of the elastic member 33 arranged at the waist opening WH.

[0025] It is preferable that the laterally stretchable sheet 32 ​​of the ventral exterior body 3A, the laterally stretchable sheet 32 ​​of the dorsal exterior body 3B, and the longitudinal stretchable sheet 42 of the crotch exterior body 3C are of the same type. This can improve the uniformity of the appearance of the diaper 1. Here, the stretchable sheets being of the same type means that a) the manufacturing process of the sheet, b) the type, fiber diameter, and fiber length of the constituent fibers of the sheet, and c) the thickness and basis weight of the sheet are all the same. If at least one of the above a) to c) is different, the sheets are of different types, that is, not of the same type. For example, even if the laterally stretchable sheet 32 ​​and the longitudinal stretchable sheet 42 have different stretch characteristics (stretch direction, stretch rate, stretch stress, etc.), color, the presence or absence of a pattern, the presence or absence of an elastic member, the arrangement pattern of the elastic member, etc., the two sheets 32, 42 are of the same type, that is, of the same type, as long as all of the above a) to c) are the same.

[0026] It is preferable that the laterally stretchable sheet 32 ​​and the longitudinally stretchable sheet 42 have different elongation rates. This allows the stress in the crotch portion C and the waist portion D to be optimized. More specifically, the elongation rate of the laterally stretchable sheet 32 ​​is preferably 170% or more, more preferably 190% or more, and also preferably 250% or less, more preferably 230% or less, and also preferably 170% or more and 250% or less, and more preferably 190% or more and 230% or less. The elongation rate of the longitudinally stretchable sheet 42 is preferably 110% or more, more preferably 130% or more, and also preferably 190% or less, more preferably 170% or less, and also preferably 110% or more and 190% or less, and more preferably 130% or more and 170% or less.

[0027] The elongation rate can be measured by the following method. <Method of measuring elongation rate> A method for measuring the elongation rate of the laterally stretchable sheet 32 ​​will be described below, but the elongation rate of the longitudinally stretchable sheet 42 can also be measured in the same manner. With the diaper 1 in its natural state, two marks are made on the laterally stretchable sheet 32, spaced 50 mm apart in the stretch direction of the laterally stretchable sheet 32. With the diaper 1 stretched to its maximum in the stretch direction of the laterally stretchable sheet 32, the distance between the two marks is measured, and this measured value is taken as the stretch distance H (mm). The stretch percentage is then calculated using the following formula: Elongation rate (%) = [Extension distance H (mm) / 50 (mm)] × 100

[0028] The inner layer sheet 31 of the exterior body 3 is preferably a sheet that does not inhibit the stretching of the laterally stretchable sheet 32 ​​in the area overlapping with the laterally stretchable sheet 32. Examples of such sheets include (1) a stretchable sheet that stretches in the laterally stretchable sheet Y, for example, a sheet having the same configuration as the laterally stretchable sheet 32, (2) an extensible sheet that stretches at least in the laterally stretchable sheet Y, and (3) a non-stretchable sheet that is joined to the laterally stretchable sheet 32 ​​in a stretched state. The sheet (1) may have stretchability or extensibility in the vertical direction X in addition to stretchability in the laterally stretchable sheet Y. The laterally stretchable sheet 32 ​​is combined with a sheet that does not inhibit stretching to form the ventral exterior body 3A and the dorsal exterior body 3B that have stretchability in the laterally stretchable sheet Y. It is also preferable that the inner layer sheet 31 is a sheet that does not inhibit the stretching of the longitudinally stretchable sheet 42 in the area overlapping with the longitudinally stretchable sheet 42. Examples of such sheets include (4) stretchable sheets that stretch in the longitudinal direction X, for example, sheets having the same configuration as the longitudinally stretchable sheet 42, (5) extensible sheets that stretch at least in the longitudinal direction X, and (6) non-stretchable sheets that are joined to the longitudinally stretchable sheet 42 in a stretched state. The sheet (4) may have stretchability or extensibility in the transverse direction Y in addition to stretchability in the longitudinal direction X. In each of the above embodiments, the inner layer sheet 31 and the laterally stretchable sheet 32 ​​or the longitudinally stretchable sheet 42 may be joined over the entire overlapping area, or may be joined partially in the overlapping area. The joints between the inner layer sheet 31 and the laterally stretchable sheet 32 ​​or the longitudinally stretchable sheet 42 may be intermittently arranged in the stretching direction of the laterally stretchable sheet, or may be arranged in a regular pattern such as dots, stripes, or spirals.

[0029] While the ventral exterior body 3A and the rear exterior body 3B have the waist elastic member 33w, it is preferable that the exterior body 3 does not have any thread-like or belt-like elastic members other than the waist elastic member 33w. This allows the diaper 1 to have a snug fit like underwear.

[0030] Each of the ventral exterior body 3A and the rear exterior body 3B has a laterally stretchable sheet 32, and it is preferable that the laterally stretchable sheet 32 ​​has a longer length in the longitudinal direction X on the rear section B side than on the ventral section A side of the longitudinal centerline Lx. This can improve the fit of the diaper 1 to the buttocks. From the viewpoint of achieving this effect more significantly, the ratio L6 / L5 of the length L6 of the portion 41B of the laterally stretchable sheet 32 ​​on the rear section B side of the longitudinal centerline Lx to the length L5 of the portion 41A of the laterally stretchable sheet 32 ​​on the ventral section A side of the longitudinal centerline Lx is preferably 1.05 or more, more preferably 1.1 or more, and also preferably 1.8 or less, more preferably 1.4 or less, and also preferably 1.05 or more and 1.8 or less, more preferably 1.1 or more and 1.4 or less.

[0031] Next, another embodiment of the present invention will be described with reference to Figures 5 and 6. The embodiment shown in Figures 5 and 6 will be described only in terms of the differences from the embodiment shown in Figures 1 to 3. The aspects of the embodiment shown in Figures 5 and 6 that are not specifically described are the same as those of the embodiment shown in Figures 1 to 3, and the description of this embodiment applies as appropriate.

[0032] In the diaper 1 shown in Figures 5 and 6, the exterior body 3 is made of a single continuous member extending from the abdominal region A through the crotch region C to the back region B. In the abdominal region A and back region B, the exterior body 3 has, like the diaper 1 shown in Figures 1 to 3, an outer layer sheet 32, an inner layer sheet 31 disposed on the skin-facing side of the outer layer sheet 32, and a plurality of thread-like or band-like elastic members 33 disposed between both sheets 31, 32. In the crotch region C, the exterior body 3 has an inner layer sheet 31 and a longitudinally stretchable sheet 42. In the diaper 1 shown in Figs. 5 and 6, like the diaper 1 shown in Figs. 1 to 3, when worn, the periphery WE of the waist opening WH is positioned appropriately and provides an excellent fit.

[0033] Next, matters common to the above-described embodiments will be described.

[0034] The top sheet 21 may be a liquid-permeable sheet, such as a nonwoven fabric or a perforated film. The top sheet 21 may have an uneven surface on the skin-facing side. For example, a plurality of scattered convex portions may be formed on the skin-facing side of the top sheet 21. Alternatively, ridges and grooves extending in one direction may be alternately formed on the skin-facing side of the top sheet 21. For such a purpose, the top sheet 21 may be formed using two or more sheets of nonwoven fabric.

[0035] For example, a liquid-impermeable film or a spunbond-meltblown-spunbond laminated nonwoven fabric can be used as the back sheet 22. A liquid-impermeable film may be provided with a plurality of micropores to impart water vapor permeability to the film. In order to further improve the feel of the absorbent article, a sheet with a good texture such as a nonwoven fabric may be laminated on the outer surface of the back sheet 22.

[0036] The absorbent body 23 has an absorbent core. The absorbent core is composed of, for example, a stack of hydrophilic fibers such as cellulose including pulp, a mixed stack of the hydrophilic fibers and an absorbent polymer, a stack of absorbent polymer, a laminated structure in which an absorbent polymer is supported between two absorbent sheets, or the like. At least the skin-facing surface of the absorbent core may be covered with a liquid-permeable core wrap sheet, or the entire surface including the skin-facing surface and the non-skin-facing surface may be covered with the core wrap sheet. As the core wrap sheet, for example, tissue paper made of hydrophilic fibers or liquid-permeable nonwoven fabric can be used.

[0037] Although the present invention has been described based on the embodiment, the present invention is not limited to the embodiment and can be modified as appropriate. For example, the absorbent body 2 may further include a structure known in this type of article, such as three-dimensional gathers. [Explanation of symbols]

[0038] 1. Pants-type disposable diapers 2. Absorbent body 3 Exterior body 3A Ventral exterior body 3B Dorsal exterior body 3C Inseam exterior body 3g narrowest part 31 Inner sheet 32 Outer layer sheet 42 Vertically stretchable sheet Lx Vertical center line

Claims

1. The absorbent body includes an absorbent body and an exterior body disposed on a non-skin facing side of the absorbent body, A pants-type absorbent article having a ventral side portion disposed on the ventral side of a wearer, a dorsal side portion disposed on the dorsal side of the wearer, and a crotch portion located between the ventral side portion and the dorsal side portion, and having a pair of side seal portions, a waist opening, and a pair of leg openings formed therein, A vertical direction corresponds to the front-to-back direction of a wearer, and a horizontal direction perpendicular to the vertical direction, The narrowest portion of the exterior body, which has the shortest length in the lateral direction, is located on the abdominal side of a vertical center line that bisects the entire length of the exterior body in the vertical direction and extends in the lateral direction, The exterior body has a vertical stretchable region in which a vertically stretchable sheet that stretches in the vertical direction is arranged at least in the crotch portion, The longitudinally stretchable sheet has a portion closer to the ventral side than the longitudinal center line, the portion being longer in the longitudinal direction than the portion closer to the dorsal side than the longitudinal center line, A pants-type absorbent article, wherein the longitudinal center position of the longitudinally stretchable sheet coincides with the longitudinal center position of the absorbent body.

2. The pants-type absorbent article according to claim 1 , wherein the longitudinally stretchable sheet has the same length as the absorbent body in the longitudinal direction.

3. The pants-type absorbent article according to claim 1 or 2, wherein the length in the lateral direction of the longitudinally stretchable sheet is equal to or greater than the length in the lateral direction of the absorbent body.

4. The abdominal portion and the dorsal portion are connected in a cylindrical shape to form a waist portion, The pants-type absorbent article according to any one of claims 1 to 3, wherein, in the vertical direction, an end portion of the vertically stretchable sheet on the ventral side reaches the waist portion of the ventral side, and an end portion of the vertically stretchable sheet on the dorsal side does not reach the waist portion of the dorsal side.

5. The abdominal portion and the dorsal portion are connected in a cylindrical shape to form a waist portion, The waist portion has a laterally stretchable sheet that stretches in the laterally stretchable direction, The laterally stretchable sheet is made of a stretchable sheet in which elastic filaments arranged to extend in the laterally stretchable sheet are bonded between two nonwoven fabrics, The pants-type absorbent article according to any one of claims 1 to 4, wherein the longitudinally stretchable sheet is composed of a stretchable sheet in which elastic filaments arranged to extend in the longitudinal direction are bonded between two nonwoven fabrics.

6. The abdominal portion and the dorsal portion are connected in a cylindrical shape to form a waist portion, The waist portion has a laterally stretchable sheet that stretches in the laterally stretchable direction, The pants-type absorbent article according to any one of claims 1 to 5, wherein the laterally stretchable sheet and the longitudinally stretchable sheet are the same type of stretchable sheet.

7. The abdominal portion and the dorsal portion are connected in a cylindrical shape to form a waist portion, The waist portion has a laterally stretchable sheet that stretches in the laterally stretchable direction, The pants-type absorbent article according to any one of claims 1 to 6, wherein the laterally stretchable sheet and the longitudinally stretchable sheet have different stretch rates.

8. The exterior body has a waist elastic member disposed along the lateral direction at the peripheral edge of the waist opening, The pants-type absorbent article according to any one of claims 1 to 7, wherein the exterior body does not have any thread-like or belt-like elastic members other than the waist elastic members.

9. The abdominal portion and the dorsal portion are connected in a cylindrical shape to form a waist portion, The waist portion has a laterally stretchable sheet that stretches in the laterally stretchable direction, The pants-type absorbent article according to any one of claims 1 to 8, wherein the laterally stretchable sheet has a longer longitudinal length on the rear side of the longitudinal center line than on the ventral side of the longitudinal center line.

10. The pants-type absorbent article according to any one of claims 1 to 9, wherein the longitudinally stretchable sheet has the same longitudinal length as the absorbent body, and the longitudinal length of the sheet on the ventral side of the longitudinal center line is at least 1.2 times the longitudinal length of the sheet on the dorsal side of the longitudinal center line.

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