JP2023027724A - Underpants type absorbent article - Google Patents

Abstract

An object of the present invention is to provide a pants-type absorbent article in which the peripheral edge of the waist opening is arranged in an appropriate position and which has excellent fitting properties when worn.
A narrowest portion 3g having the shortest length in the lateral direction Y of the exterior body 3 bisects the entire length of the exterior body 3 in the longitudinal direction X and extends in the lateral direction Y. Located on the side of the ventral part A, the outer body 3 has at least the crotch part C a longitudinally stretchable region in which a longitudinally stretchable sheet 42 that stretches in the longitudinal direction X is arranged. In the stretchable sheet 42, the portion on the side of the ventral portion A from the longitudinal center line Lx is longer in the longitudinal direction X than the portion on the side of the dorsal portion B from the longitudinal center line Lx. A pants-type absorbent article 1 in which a central position 42c in the longitudinal direction X of an elastic sheet 42 and a central position 2c in the longitudinal direction X of an absorbent main body 2 are aligned.
[Selection drawing] Fig. 3

Description

The present invention relates to pants-type absorbent articles.

Conventionally, it has an abdominal part arranged on the abdomen of the wearer, a dorsal part arranged on the dorsal side of the wearer, and a crotch part located between the abdominal part and the dorsal part. , a pair of side seal portions, a waist opening, and a pair of leg openings are known (see Patent Documents 1 and 2). In such a pants-type absorbent article, considering that the skin of the buttocks stretches during movement of the wearer of the absorbent article, for example, when the wearer sits down or walks, the dorsal side of the outer body is In order to make the vertical length of the part longer than the vertical length of the ventral part, the narrowest part with the narrowest width in the exterior body is arranged near the ventral part. ing.

JP 2019-118554 A JP 2016-67511 A

When the absorbent article is worn, the wearer's legs fit in the portion corresponding to the narrowest portion of the absorbent article. When the article is worn naturally, the position of the peripheral edge of the waist opening may be lower on the ventral side than on the dorsal side. On the other hand, if the narrowest portion is arranged near the back side, the area of the portion covering the wearer's buttocks in the outer body becomes relatively small, resulting in poor fit.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an absorbent article capable of overcoming the drawbacks of the prior art.

The present invention comprises an absorbent main body and an exterior body disposed on the non-skin facing side of the absorbent main body,
a pair of abdominal parts arranged on the abdominal side of the wearer, a dorsal part arranged on the dorsal side of the wearer, and a crotch part positioned between the abdominal part and the dorsal part; The present invention relates to a pants-type absorbent article having side seal portions, a waist opening and a pair of leg openings.
The pants-type absorbent article has a longitudinal direction corresponding to the front-rear direction of the wearer and a lateral direction orthogonal to the longitudinal direction.
In the underpants-type absorbent article, the narrowest portion having the shortest length in the horizontal direction of the outer packaging bisects the entire length of the outer packaging in the vertical direction and extends in the horizontal direction along the longitudinal center line. It is positioned closer to the ventral side than the
The outer body has, at least at the crotch portion, a longitudinally stretchable region in which the longitudinally stretchable sheet that stretches in the longitudinal direction is arranged.
In the longitudinally stretchable sheet, the portion closer to the abdominal side than the longitudinal center line is longer in the longitudinal direction than the portion closer to the dorsal side than the longitudinal center line.
The longitudinal central position of the longitudinally stretchable sheet and the longitudinal central position of the absorbent body are aligned.

ADVANTAGE OF THE INVENTION According to the present invention, it is possible to provide a pants-type absorbent article in which the periphery of the waist opening is arranged in an appropriate position and which has excellent fitting properties when worn.

FIG. 1 is a developed plan view schematically showing the skin-facing surface (inner surface) side of an underpants-type disposable diaper, which is one embodiment of the underpants-type absorbent article of the present invention, in an unfolded and stretched state. FIG. 2 is a sectional view taken along line II-II of FIG. FIG. 3 is a side view showing a state in which the diaper shown in FIG. 1 is worn. FIG. 4 is a partially broken perspective view schematically showing an example of an elastic sheet for the diaper shown in FIG. 1. FIG. FIG. 5 is a developed plan view schematically showing the skin-facing surface (inner surface) side of an underpants-type disposable diaper, which is another embodiment of the underpants-type absorbent article of the present invention, in an unfolded and stretched state. FIG. 6 is a sectional view taken along line VI-VI of FIG.

The present invention will be described below based on its preferred embodiments.
1 to 3 show an underpants-type disposable diaper (hereinafter referred to as "diaper") 1, which is one embodiment of the underpants-type absorbent article of the present invention. As shown in FIGS. 1 to 3, the diaper 1 has an abdominal portion A that is arranged on the abdomen side of the wearer when worn, and a dorsal portion B that is arranged on the back side of the wearer, and is positioned between them. A crotch part C is provided. The diaper 1 also has a longitudinal direction X corresponding to the front-rear direction of the wearer and a transverse direction Y orthogonal to the longitudinal direction X. As shown in FIG. The longitudinal direction X is a direction extending from the ventral portion A to the dorsal portion B via the crotch portion C. As shown in FIG.

As shown in FIGS. 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 exterior body 3A arranged in the ventral part A, a back exterior body 3B arranged in the dorsal part B, and a crotch exterior body 3C arranged in the crotch part C. there is

In the diaper 1, both side portions 3e, 3e along the longitudinal direction X of the abdomen side exterior body 3A and both side portions 3f, 3f along the longitudinal direction X of the back side exterior body 3B are joined to form a pair of side seal portions S, S, a waist opening WH and a pair of leg openings LH, LH are formed. The diaper 1 also has a waist portion D in which the abdominal portion A and the back portion B are connected in a tubular shape.

The absorbent main body 2, as shown in FIG. 1, has a rectangular shape in a plan view, and is arranged in the central portion of the exterior body 3 in the horizontal direction Y with its longitudinal direction aligned with the vertical direction X of the diaper 1, It extends in the longitudinal direction X from the ventral part A to the dorsal part B via the crotch part C.
As shown in FIG. 2, the absorbent body 2 comprises 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. have
Like the absorbent body 2 , the absorbent body 23 has a shape elongated in the longitudinal direction X of the diaper 1 and is interposed between the top sheet 21 and the back sheet 22 .
The top sheet 21, the absorbent body 23 and the back sheet 22 are integrated by known joining means such as bonding with an adhesive or fusion.

The "skin-facing surface" is the surface facing the wearer's skin when the diaper 1 is worn, and the "non-skin-facing surface" is the diaper This is the side facing away from the wearer's skin when 1 is worn. Also, "when worn" and "worn state" refer to a state in which the diaper 1 is worn while maintaining an appropriate wearing position.

As described above, the exterior body 3 includes a ventral exterior body 3A, a back exterior body 3B, and a crotch exterior body 3C. In this embodiment, the plurality of exterior bodies 3A to 3C are connected to each other in the longitudinal direction X to form a single exterior body 3 having a continuous shape. The outer body 3 has a larger area than the absorbent main body 2 and extends outward from the peripheral edge 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 outer body 3 has a constricted central portion in the longitudinal direction X including the crotch outer body 3C, and the outer body 3 as a whole has an hourglass shape. there is A narrowest portion 3g having the shortest length in the lateral direction Y of the exterior body 3 bisects the total length L of the exterior body 3 in the longitudinal direction X and extends in the lateral direction Y, and is ventral to the longitudinal center line Lx. It is located on the part A side.

In the embodiment shown in FIG. 1, the ventral exterior body 3A and the dorsal exterior body 3B are composed of an outer layer sheet 32, an inner layer sheet 31 disposed on the skin-facing side of the outer layer sheet 32, and a sheet between the sheets 31 and 32. It has a plurality of thread-like or band-like elastic members 33 arranged in a row. The elastic member 33 is fixed to a sheet forming the exterior body 3 in a stretched state. The elastic member 33 includes a waist elastic member 33w arranged along the lateral direction Y at the peripheral edge WE of the waist opening WH.
The outer body 3 has a longitudinal stretchable region 41 at least at the crotch portion C. As shown in FIG. The vertical stretchable region 41 extends over the entire thickness of the exterior body 3 . A longitudinally stretchable sheet 42 that stretches in the longitudinal direction X is arranged in the longitudinally stretchable region 41 . The longitudinally stretchable sheet 42 may have a portion that overlaps with another member that does not hinder the stretchability in the longitudinal direction X. As shown in FIG. In this embodiment, the crotch outer body 3</b>C is formed of a longitudinally stretchable sheet 42 . The inner layer sheet 31 may be laminated on the side of the longitudinally stretchable sheet 42 facing the skin. The inner layer sheet 31 is preferably a sheet that does not inhibit the stretching of the longitudinally stretchable sheet 42 .

In the diaper 1, the longitudinally stretchable sheet 42 has a portion 42A closer to the ventral portion A than the longitudinal center line Lx, and a portion 42B closer to the dorsal portion B than the longitudinal center line Lx. length is longer. The advantages of doing this are: As described above, the diaper 1 has the narrowest portion 3g positioned closer to the abdominal portion A than the longitudinal center line Lx. As a result, the outer body 3 has a longer length in the longitudinal direction X on the dorsal side B side than on the ventral side A side, and the area of the dorsal side B covering the wearer's buttocks becomes relatively large. Therefore, the fit of the diaper 1 is improved. In the conventional diaper, when the narrowest portion 3g is positioned closer to the abdominal side portion A than the longitudinal center line Lx, as shown in FIG. The position of the ventral part A may be lower than that of the dorsal part B. On the other hand, in the diaper 1 of the present embodiment, the portion 42A of the longitudinally stretchable sheet 42 on the abdominal side A side of the longitudinal center line Lx is more elongated in the longitudinal direction X than the portion 42B on the dorsal side B side. Since the length is longer, the longitudinally stretchable sheet 42 is stretched in the longitudinal direction X, so that the exterior body 3 as a whole is pulled toward the ventral portion A side. As a result, the position of the peripheral edge WE of the waist opening WH can be prevented from becoming lower in the ventral part A than in the dorsal part B, and the peripheral edge WE of the waist opening WH is in an appropriate position. can be distributed.
As described above, according to the diaper 1 of the present embodiment, the periphery of the waist opening WH is arranged at an appropriate position, and the fit is excellent.

From the viewpoint of achieving the above-described effects more remarkably, the length La of the longitudinal direction X of the portion 42A of the longitudinally stretchable sheet 42 closer to the ventral side A than the longitudinal center line Lx It is preferably 1.2 times or more, more preferably 1.3 times or more, and preferably 1.3 times or more the length Lb in the longitudinal direction X of the portion 42B on the dorsal side B side of the longitudinal center line Lx of the sheet 42. It is 2.0 times or less, more preferably 1.5 times or less, more preferably 1.2 times or more and 2.0 times or less, more preferably 1.3 times or more and 1.5 times or less.

In the diaper 1, the longitudinal direction X central position 42c of the longitudinally stretchable sheet 42 and the longitudinal direction X central position 2c of the absorbent main body 2 are aligned. As a result, even when the longitudinally stretchable sheet 42 is stretched, the central position 42c of the absorbent body 2 in the longitudinal direction X is less likely to shift relative to the exterior body 3. In addition, the absorbent body 2 can be arranged at an appropriate position, and the fit of the diaper 1 can be further improved. Here, the fact that the central position 42c in the longitudinal direction X of the longitudinally stretchable sheet 42 and the central position 2c in the longitudinal direction X of the absorbent main body 2 match means that the central position in the longitudinal direction X of the longitudinally stretchable sheet 42 It means that the distance between 42c and the central position 2c in the longitudinal direction X of the absorbent main body 2 is within 10% of the total length of the absorbent main body 2, preferably within 5%.

The vertical stretch sheet 42 preferably has the same length in the vertical direction X as the absorbent body 2 . By doing so, it is possible to prevent the stretching force of the longitudinally stretchable sheet 42 from being reduced, and to make the effect of the stretching of the longitudinally stretchable sheet 42 more remarkable. In addition, it is possible to prevent the wearer from feeling a sense of incongruity due to the shrinkage of only the exterior body 3 and the occurrence of wrinkles in the exterior body 3 .
Here, when the length L3 of the longitudinally stretchable sheet 42 in the longitudinal direction X and the length L2 of the absorbent main body 2 in the longitudinal direction X are the same, it means that the length L3 and the length L2 are completely the same. This includes not only the case where the length L3 is the same as , but also the case where the length L3 and the length L2 are substantially the same.

The ratio L3/L2 of the length L3 of the longitudinally stretchable sheet 42 in the longitudinal direction X to the length L2 of the absorbent body 2 in the longitudinal direction X makes the effect of the stretching of the longitudinally stretchable sheet 42 more remarkable. From the viewpoint of reducing the It is 1.4 or less, more preferably 1.1 or less, and from the viewpoint of compatibility between these, it is preferably 0.5 or more and 1.4 or less, more preferably 0.9 or more and 1.1 or less.

The length D3 in the lateral direction Y of the longitudinally stretchable sheet 42 is preferably equal to or greater than the length D2 in the lateral direction Y of the absorbent body 2 . By doing so, it is possible to prevent the stretching force of the longitudinally stretchable sheet 42 from being reduced, and to make the effect of the stretching of the longitudinally stretchable sheet 42 more remarkable.
From the same 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 preferably 2.0 or less, more preferably 1. 0.5 or less, preferably 1.0 or more and 2.0 or less, more preferably 1.2 or more and 1.5 or less.

The diaper 1 has a waist portion D in which an abdominal portion A and a back 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 abdominal exterior body 3A and both side portions 3f, 3f of the dorsal exterior body 3B.
In the longitudinal direction X, the end portion 42a of the longitudinally stretchable sheet 42 on the side of the abdominal portion A preferably reaches the waist portion D of the abdominal portion A. By doing so, the length La of the portion 42A of the longitudinally stretchable sheet 42 on the side of the abdominal portion A becomes longer, so that the position of the peripheral edge WE of the waist opening WH is greater than that of the abdominal portion A. It is possible to further prevent it from becoming lower than B. From the viewpoint of making this effect more pronounced, the longitudinally stretchable sheet 42 and the waist portion D of the abdominal portion A overlap in the longitudinal direction X with respect to the length L3 of the longitudinally stretchable sheet 42. The ratio L4/L3 of the portion length L4 is preferably 0 or more, more preferably 0.1 or more, and is preferably 0.5 or less, more preferably 0.2 or less, and is preferably 0 or more. It is 0.5 or less, more preferably 0.1 or more and 0.2 or less.

It is preferable that the end portion 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. By doing so, it is possible to prevent unnecessary wrinkles from occurring in the waist portion D of the back side portion B, and the feeling of wearing the diaper 1 can be improved.

In the diaper 1, the crotch outer body 3C includes the longitudinally stretchable sheet 42 as described above. It is preferable that the abdominal exterior body 3A and the dorsal exterior body 3B include laterally stretchable sheets that are laterally stretchable. 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 composed of two non-woven fabrics 51 and 52 joined to each other by elastic filaments 53 extending in the longitudinal direction X or the lateral direction Y. It is an elastic sheet. The two fiber sheets 51 and 52 are stretchable in the vertical direction X or the horizontal direction Y.

The laterally stretchable sheet 32 and the longitudinally stretchable sheet 42 having the above configurations can be produced, for example, according to the method described in JP-A-2009-61743. Specifically, for example, a plurality of molten elastic filaments 53 spun from a spinning nozzle are drawn at a predetermined speed and stretched, and before solidification of the elastic filaments 53, the elastic filaments 53 are aligned without intersecting each other. After the elastic filaments 53 are fused to the fiber sheets 51 and 52 so as to be aligned in the direction, both sheets 51 and 52 to which the elastic filaments 53 are fused are stretched along the direction in which the elastic filaments 53 extend. Thus, the laterally stretchable sheet 32 or the longitudinally stretchable sheet 42 can be manufactured. The laterally stretchable sheet 32 has stretchability in the lateral direction Y as a whole, and the longitudinally stretchable sheet 42 has stretchability in the longitudinal direction X as a whole.
By making each of the laterally stretchable sheet 32 and the longitudinally stretchable sheet 42 a stretchable sheet as described above, the diaper 1 can be provided with a feeling of flattering fit like underwear.
The elastic filament 53 is fixed in a substantially non-stretched state, and the area of the cross section perpendicular to the longitudinal direction is smaller than that of the elastic member 33 arranged in the waist opening WH. It differs from the thread-like or band-like elastic member 33 arranged in the opening WH.

The laterally stretchable sheet 32 of the abdominal exterior body 3A, the laterally stretchable sheet 32 of the dorsal exterior body 3B, and the longitudinally stretchable sheet 42 of the crotch exterior body 3C are preferably of the same type. By doing so, the uniformity of the appearance of the diaper 1 can be improved. Here, the elastic sheets 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. means. If at least one of a) to c) is different, the sheets are of different types, that is, they are not of the same type. For example, the laterally stretchable sheet 32 and the vertically stretchable sheet 42 may differ in terms of stretch characteristics (stretching direction, elongation rate, stretch stress, etc.), colors, presence or absence of patterns, presence or absence of elastic members, arrangement patterns of elastic members, and the like. However, if all of the above a) to c) are the same, both sheets 32 and 42 are of the same type, that is, of the same type.

It is preferable that the laterally stretchable sheet 32 and the longitudinally stretchable sheet 42 have different elongation rates. By doing so, the stress in each of the crotch portion C and the waist portion D can be optimized. More specifically, the elongation rate of the laterally stretchable sheet 32 is preferably 170% or more, more preferably 190% or more, and preferably 250% or less, more preferably 230% or less. It is 170% or more and 250% or less, 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, more preferably 190% or less, more preferably 170% or less, and more preferably 110% or more and 190% or less. , more preferably 130% or more and 170% or less.

The elongation rate can be measured by the following method.
<Method for 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 at intervals of 50 mm in the direction of stretching of the laterally stretchable sheet 32 . The distance between the two marks is measured with the diaper 1 stretched to the maximum in the stretching direction of the laterally stretchable sheet 32, and the measured value is defined as the stretching distance H (mm). Then, the elongation rate is obtained from the following equation.
Elongation rate (%) = [elongation distance H (mm) / 50 (mm)] × 100

The inner layer sheet 31 of the exterior body 3 is preferably a sheet that does not inhibit the expansion and contraction of the laterally stretchable sheet 32 in the region overlapping the laterally stretchable sheet 32 . Such sheets include (1) a stretchable sheet that stretches in the lateral direction 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 lateral direction Y, and (3) Although it is a non-stretchable sheet, it may be a sheet joined to the laterally stretchable sheet 32 while the laterally stretchable sheet 32 is stretched. The sheet of (1) may have stretchability or extensibility in the longitudinal direction X in addition to stretchability in the lateral direction Y. The laterally stretchable sheet 32 is combined with a sheet that does not hinder stretching to form the ventral exterior body 3A and the dorsal exterior body 3B having lateral Y-direction stretchability.
Also, the inner layer sheet 31 is preferably a sheet that does not hinder the expansion and contraction of the longitudinally stretchable sheet 42 in the region overlapping the longitudinally stretchable sheet 42 . Such sheets include (4) a stretchable sheet that stretches in the longitudinal direction X, for example, a sheet having the same configuration as the longitudinally stretchable sheet 42, (5) an extensible sheet that stretches at least in the longitudinal direction X, and (6) Although it is a non-stretchable sheet, it may be a sheet joined to the longitudinally stretchable sheet 42 while the longitudinally stretchable sheet 42 is being stretched. The sheet of (4) may have stretchability or extensibility in the lateral 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 vertically stretchable sheet 42 may be joined in the entire overlapping region, or may be partially joined in the region. . The joints between the inner layer sheet 31 and the laterally stretchable sheet 32 or the longitudinally stretchable sheet 42 may be arranged intermittently in the stretching direction of the laterally stretchable sheet, or may be in the form of dots, stripes, spirals, or the like. They may be arranged in a regular pattern.

While the abdominal exterior body 3A and the dorsal exterior body 3B have waist elastic members 33w, the exterior body 3 preferably does not have thread-like or band-like elastic members other than the waist elastic members 33w. By doing so, it is possible to give the diaper 1 a feeling of a flattering fit like that of underwear.

The ventral exterior body 3A and the dorsal exterior body 3B each have a laterally stretchable sheet 32, and the laterally stretchable sheet 32 is closer to the dorsal side B than the longitudinal center line Lx. It is preferable that the length in the longitudinal direction X is longer than the side. By doing so, the fit of the diaper 1 to the buttocks can be improved. From the viewpoint of making this effect more pronounced, the longitudinal direction The ratio L6/L5 of the length L6 of the portion 41B on the side of the dorsal portion B from the center line Lx is preferably 1.05 or more, more preferably 1.1 or more, and preferably 1.8 or less. It is preferably 1.4 or less, more preferably 1.05 or more and 1.8 or less, more preferably 1.1 or more and 1.4 or less.

Next, another embodiment of the present invention will be described with reference to FIGS. 5 and 6. FIG. The embodiment shown in FIGS. 5 and 6 will be described only with respect to the differences from the embodiment shown in FIGS. 1-3. 5 and 6 are the same as those of the embodiment shown in FIGS. 1 to 3, and the description of the embodiment applies appropriately.

In the diaper 1 shown in FIGS. 5 and 6, the outer body 3 is composed of one member that is continuous from the abdominal portion A to the back portion B via the crotch portion C. As shown in FIG. In the abdominal part A and the back part B, the outer layer sheet 32 and the inner layer sheet 31 disposed on the skin facing side of the outer layer sheet 32 are arranged in the outer layer sheet 32 in the same manner as the diaper 1 shown in FIGS. and a plurality of thread-like or band-like elastic members 33 arranged between the sheets 31 and 32 . The outer body 3 has an inner layer sheet 31 and a longitudinally stretchable sheet 42 at the crotch portion C. As shown in FIG.
In the diaper 1 shown in FIGS. 5 and 6, similarly to the diaper 1 shown in FIGS. 1 to 3, when the diaper 1 is worn, the peripheral edge WE of the waist opening WH is arranged at an appropriate position and the fit is improved. Excellent.

Next, items shared by the above-described embodiments will be described.

As the surface sheet 21, a liquid-permeable sheet such as a nonwoven fabric or a perforated film can be used. The surface sheet 21 may have an uneven surface on the side facing the skin. For example, a plurality of convex portions can be formed in a scattered pattern on the side of the surface facing the skin of the topsheet 21 . Alternatively, ridges and grooves extending in one direction may be alternately formed on the skin-facing surface of the topsheet 21 . For such purposes, the topsheet 21 may be formed using two or more nonwoven fabrics.

As the back sheet 22, for example, a liquid impermeable film, a spunbond/meltblown/spunbond laminated nonwoven fabric, or the like can be used. A plurality of micropores may be provided in the liquid-impermeable film to impart water vapor permeability to the film. For the purpose of improving the feel of the absorbent article, etc., the outer surface of the backsheet 22 may be laminated with a sheet having good texture such as a non-woven fabric.

The absorbent body 23 has an absorbent core. The absorbent core is, for example, a pile of hydrophilic fibers such as cellulose such as pulp, a mixed pile of hydrophilic fibers and an absorbent polymer, a pile of absorbent polymer, or between two absorbent sheets. It is composed of a laminated structure in which an absorbent polymer is carried in the body. 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, a thin paper made of hydrophilic fibers, a liquid-permeable nonwoven fabric, or the like can be used.

Although the present invention has been described based on the embodiments, the present invention is not limited to the above embodiments and can be modified as appropriate.
For example, the absorbent main body 2 may further have a configuration known in this type of article, such as three-dimensional gathers.

1 Pants-type disposable diaper 2 Absorbent body 3 Outer body 3A Abdominal outer body 3B Back side outer body 3C Inseam outer body 3g Narrowest part 31 Inner layer sheet 32 Outer layer sheet 42 Vertically stretchable sheet Lx Vertical center line

Claims (10)

comprising an absorbent main body and an exterior body disposed on the non-skin facing side of the absorbent main body,
a pair of abdominal parts arranged on the abdominal side of the wearer, a dorsal part arranged on the dorsal side of the wearer, and a crotch part positioned between the abdominal part and the dorsal part; A pants-type absorbent article in which a side seal portion, a waist opening and a pair of leg openings are formed,
having a longitudinal direction corresponding to the front-rear direction of the wearer and a lateral direction orthogonal to the longitudinal direction;
The narrowest portion having the shortest length in the horizontal direction of the exterior body bisects the entire length in the vertical direction of the exterior body and is located on the ventral side side of the longitudinal center line extending in the lateral direction. , is located in
The outer body has a longitudinally stretchable region in which at least the crotch part is provided with the longitudinally stretchable sheet that stretches in the longitudinal direction,
In the longitudinally stretchable sheet, a portion closer to the ventral side than the longitudinal center line is longer in the longitudinal direction than a portion closer to the dorsal side than the longitudinal center line,
The pants-type absorbent article, wherein the longitudinal center position of the longitudinally stretchable sheet and the longitudinal center position of the absorbent main body are aligned. 2. The pants-type absorbent article according to claim 1, wherein said longitudinally stretchable sheet has the same length in said longitudinal direction as said absorbent body. The pants-type absorbent article according to claim 1 or 2, wherein the length in the horizontal direction of the longitudinally stretchable sheet is equal to or greater than the length in the horizontal direction of the absorbent body. Having a waist portion in which the abdominal portion and the dorsal portion are cylindrically connected,
In the longitudinal direction, the ventral side end of the longitudinally stretchable sheet reaches the waist part of the ventral part, and the dorsal side end of the longitudinally stretchable sheet is 4. The pants-type absorbent article according to any one of claims 1 to 3, wherein the dorsal portion does not reach the waist portion. Having a waist portion in which the abdominal portion and the dorsal portion are cylindrically connected,
The waist part has a laterally stretchable sheet that stretches in the lateral direction,
The laterally stretchable sheet is composed of a stretchable sheet in which the elastic filaments arranged to extend in the lateral direction are joined between two nonwoven fabrics,
5. The apparatus according to any one of claims 1 to 4, wherein the longitudinally stretchable sheet comprises a stretchable sheet in which the elastic filaments arranged to extend in the longitudinal direction are joined between two nonwoven fabrics. A pant-type absorbent article as described. Having a waist portion in which the abdominal portion and the dorsal portion are cylindrically connected,
The waist part has a laterally stretchable sheet that stretches in the lateral 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 of the same type. Having a waist portion in which the abdominal portion and the dorsal portion are cylindrically connected,
The waist part has a laterally stretchable sheet that stretches in the lateral 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 elongation rates. The outer body has a waist elastic member arranged along the lateral direction along the peripheral edge of the waist opening,
The underpants-type absorbent article according to any one of claims 1 to 7, wherein the outer body does not have thread-like or band-like elastic members other than the waist elastic member. Having a waist portion in which the abdominal portion and the dorsal portion are cylindrically connected,
The waist part has a laterally stretchable sheet that stretches in the lateral direction,
9. The laterally stretchable sheet according to any one of claims 1 to 8, wherein the length in the longitudinal direction is longer on the dorsal side than on the longitudinal center line than on the ventral side. A pant-type absorbent article as described. The longitudinally stretchable sheet has the same length in the longitudinal direction as the absorbent main body, and the length in the longitudinal direction on the abdomen side of the longitudinal center line is greater than the longitudinal center line. The underpants-type absorbent article according to any one of claims 1 to 9, wherein the length of the back portion side in the longitudinal direction is 1.2 times or more.

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