TW201932084A - Pants-type absorbent article - Google Patents

Abstract

A pants-type absorbent article (1) which includes an absorbent body (10) that is provided with an absorbent core (11) arranged along the vertical direction and that is folded at a lower end in the vertical direction to form a front side and a rear side, wherein the absorbent core (11) has a rear portion (10R), which is the portion folded to the rear side in the front-rear direction, and the absorbent core (11) has, in the rear portion (10R), a rear low basis weight region (39) which has an average basis weight that is lower than the surrounding regions and a buttocks high basis weight region (55) which is provided more toward the top in the vertical direction than the rear low basis weight region (39) and which has an average basis weight that is higher than the rear low basis weight region (39), and at least a portion of a boundary portion (55BF) between the rear low basis weight region (39) and the buttocks high basis weight region (55) inclines diagonally downward toward opposite outer sides from the center in the right direction.

Description

Shorts type absorbent article

The present invention relates to a pants-type absorbent article.

The pants-type absorbent article has an absorbent core material that absorbs excretory liquid such as urine. Further, by providing a slit or the like in a region of a part of the absorbent core material, the rigidity is lowered, so that when the pants type absorbent article is worn, the absorbent core material is easily bent at the low rigidity portion, and it is easy to follow The technique of wearing a three-dimensional deformation of the wearer's body is well known. For example, Patent Document 1 discloses an absorbent article in which an absorbent core member is divided into three regions of abdomen side portion, an intermediate portion, and a back side portion in a longitudinal direction, and groove-shaped recessed portions are provided in respective regions. The concave portions are connected to each other.

[Previous Technical Literature]
[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2012-143535

[Problems to be solved by the invention]

In the absorbent article of Patent Document 1, the absorbent body is easily deformed. However, since the concave portions of the intermediate portion and the back side portion are connected to each other, the fit property may be deteriorated. For example, there is a deformation of the intermediate portion recess which becomes the starting point of the bending of the absorbent core in the crotch portion of the wearer, which induces deformation of the back side recess, resulting in the back side of the wearer along the buttock shape. The deformation of the absorbent core material is less likely to occur. Further, when the wearer moves the foot forward and backward while walking, the force in the opposite direction (front direction and rear direction) acts on the width direction of the absorbent core in the crotch portion (middle portion). Side, but if the force in the opposite direction is transmitted to the back side, there will be wrinkles on the buttocks. Therefore, in the absorbent article of Patent Document 1, there is a problem that the fit and the skin feel are deteriorated in the crotch portion and the crotch portion.

The present invention has been made in view of the above problems, and an object of the invention is to provide a pants-type absorbent article which can achieve good fit in the crotch portion and the buttocks of the absorbent core member.

[Means to solve the problem]

In order to achieve the above-mentioned main object, the underpants-type absorbent article has an up-and-down direction, a left-right direction, and a front-rear direction which intersect each other, and has an absorbent core material disposed along the vertical direction, and is in the vertical direction. A pants-type absorbent article in which the lower end portion is bent toward the front and rear absorbent body, wherein the absorbent core member has a rear side portion that is bent toward the rear side in the front-rear direction, and the absorbent core member In the rear side portion, a rear side low basis weight region having an average basis weight lower than a surrounding area, and an upper side disposed closer to the upper and lower directions than the rear side low basis weight region, and an average basis weight of the rear side In the high base area of the buttocks having a low basis weight region, at least a part of the boundary portion between the rear side low basis weight region and the buttocks high basis weight region is inclined obliquely downward from the center in the left-right direction toward both outer sides.
Other features of the present invention will become more apparent from the description of the specification and the drawings.

[Effect of the invention]

According to the present invention, it is possible to provide a pants-type absorbent article which can achieve good fit in the crotch portion and the buttocks of the absorbent core member.

According to the description of the specification and the accompanying drawings, at least the following matters can be made clear.
A pants-type absorbent article having an absorbent core material disposed along the vertical direction and having an upper and lower direction, a left-right direction, and a front-rear direction that intersect each other, and is bent forward and backward at a lower end portion in the vertical direction. In a pants-type absorbent article of the absorbent body, the absorbent core member has a rear side portion that is bent toward the rear side in the front-rear direction, and the absorbent core member has a rear side portion. a low base weight region having a lower average basis weight than the surrounding region, and a hip height higher than the upper side of the lower rear basis weight region and having an average basis weight higher than the rear side low basis weight region In the basis weight region, at least a part of the boundary portion between the rear side low basis weight region and the hip high basis weight region is inclined obliquely downward from the center in the left-right direction toward both outer sides.

According to such a pants-type absorbent article, the force for compressing the absorbent core in the right and left direction can be suppressed from being transmitted from the crotch portion to the buttocks side by the high base area of the buttocks. Further, the absorbent core material is inclined to rise along the boundary between the rear low basis weight region and the buttocks high basis weight region, and is formed to wrap the buttocks of the wearer. Thereby, it is possible to provide an improvement in the fit of the absorbent core material from the lower part of the crotch to the area of the buttocks.

In the pants type absorbent article, it is preferable that the rear side low basis weight region has a longitudinal portion along the vertical direction.

According to such a pants-type absorbent article, in the region from the crotch portion to the buttocks, the absorbent core member is likely to be bent and deformed from the longitudinal portion. Thereby, from the wearer's crotch, the absorbent core material can be easily three-dimensionally deformed along the shape of the body near the buttocks.

In the pants-type absorbent article, it is preferable to further include a rear side belt portion that is connected to the absorbent body and that expands and contracts in the left-right direction, and at least a portion of the rear side low basis weight region in the vertical direction. It is repeated with the aforementioned rear side expansion and contraction region.

According to such a pants-type absorbent article, the contraction force in the left-right direction acts on the rear low-weight region in the portion overlapping the rear side stretch region. Thereby, in this repeated portion, the absorbent core material is easily contracted and deformed, and the external force generated by the action of the wearer's foot or the like can be easily buffered. Therefore, the fit of the absorbent core material can be improved.

In the pants type absorbent article, it is preferable that the hip high basis weight region overlaps with the rear side stretch region in the vertical direction.

According to such a pants-type absorbent article, by the contraction force of the rear side stretchable region, the high-heavy buttocks high basis weight region is easily deformed. Moreover, the contraction force acts from the non-skin side, and the high base area of the buttocks is pressed against the wearer's skin. Therefore, the high base area of the buttocks can be deformed to form a curved surface along the curvature of the buttocks of the wearer, and it is easy to adhere to the wearer's skin, and the fit of the absorbent core material can be further improved.

In the pants type absorbent article, it is preferable to further have a rear side stretchable region that expands and contracts in the left-right direction, and has a rear side belt portion connected to the absorbent body, and at least the rear side low basis weight region in the vertical direction A part is repeated with the aforementioned rear side belt portion.

According to such a pants-type absorbent article, it is easy to ensure the rigidity of the non-skin side of the rear low basis weight region in the portion overlapping the rear side belt portion. Therefore, the absorbent core material is more likely to be bent toward the skin side than the non-skin side, and the outer belt force can be cushioned by the rear side belt portion even when excessive external force acts on the rear side low basis weight region. It is possible to suppress breakage of the absorbent core material.

In the pants type absorbent article, it is preferable that the absorbent core member is on the rear side portion, and is higher than the above-mentioned buttocks high basis weight region, and has a low hip basis weight region having an average basis weight lower than that of the surrounding region.

According to such a pants-type absorbent article, a low basis weight region is provided by the upper side (the buttock side) and the lower side (the crotch side) of the high base area of the buttocks, so that it is easy to be used in each area. Let the absorbent core material deform more naturally.

In the pants-type absorbent article, it is preferable that at least a part of the boundary portion between the buttocks high basis weight region and the buttocks low basis weight region is inclined obliquely downward from the center in the left-right direction toward both outer sides.

According to such a pants-type absorbent article, the region of the absorbent core material that is closer to the upper side than the high-heavy basis weight region of the absorbent core material is obliquely erected along the inclination of the boundary portion, and is likely to form a wrap around the wearer's buttocks. Curved surface.

In the pants-type absorbent article, it is preferable that an angle of a smaller one of the angles formed by the boundary portion between the rear side low basis weight region and the hip high-weight region in the left-right direction is higher than the aforementioned hip height The angle between the region and the aforementioned low-weight region of the buttocks is larger at an angle of the smaller of the angles formed by the left-right direction.

According to such a pants-type absorbent article, the amount of deformation of the absorbent core material can be increased by increasing the inclination angle at the boundary portion closer to the crotch portion, and the bending deformation of the absorbent core material can easily occur. . Further, at the boundary portion closer to the buttocks, by narrowing the inclination angle, the curvature of the absorbent core easily extending the buttocks is gently deformed.

In the pants-type absorbent article, the length of the boundary portion between the buttocks high basis weight region and the buttocks low basis weight region in the left-right direction is desired, and the rear side low basis weight region in the left-right direction is the aforementioned The length of the boundary portion of the high base area of the buttocks is longer.

According to such a pants-type absorbent article, the area where the absorbent core material can be deformed can be made wider at the boundary portion of the buttocks closer to the wearer. Therefore, by the absorbent core material, it becomes easy to cover a wider area of the buttocks, and the fit is further improved.

In the pants type absorbent article, it is preferable that the buttocks low basis weight region has a plurality of longitudinal portions along the vertical direction, and an upper end position of at least a part of the longitudinal portion in the vertical direction and the absorbent core The upper end position of the material is the same.

According to such a pants-type absorbent article, since the base weight and the rigidity are reduced in the upper end edge of the absorbent core material, the upper edge portion is easily deformed softly. Therefore, the upper end portion of the absorbent core material is easily deformed in accordance with the curve of the waist circumference of the wearer's buttock side, and the skin of the waist circumference can be softened.

In the pants type absorbent article, it is preferable that the rear side low basis weight region has a longitudinal portion along the vertical direction; and a plurality of horizontally long portions intersecting the longitudinal portion.

According to such a pants-type absorbent article, the longitudinal core portion extending in the vertical direction and the horizontally long portion extending in the left-right direction are mutually intersected, so that the absorbent core member can be made in the crotch portion. More flexible deformation.

For example, the pants-type absorbent article, wherein it is desired to be located in the crotch portion of the wearer's armpit when worn, has a crotch member laminated on the non-skin side than the aforementioned absorbent core material, and has a The crotch expansion-contraction region in which the vertical direction is extended and contracted, and at least a part of the rear low-weight region is overlapped with the crotch expansion-contraction region.

According to such a pants-type absorbent article, the stretchability in the up-and-down direction acts on the non-skin side from the low basis weight region on the rear side of the absorbent core material, so that the absorbent core material is formed along the back side low basis weight region. The lower part of the wearer is bent. Moreover, since the absorbent core material is easily bent toward the skin side, deformation along the shape of the wearer can be promoted.

In the pants-type absorbent article, it is preferable that the absorbent core member is provided along the vertical direction in a lower side of the up-and-down direction and a center in the left-right direction of the hip high-weight region in the rear side portion. Through the central low basis weight area.

According to such a pants-type absorbent article, when the absorbent core material is held by both feet in the lower part of the wearer's crotch, the absorbent core material is easily folded in the up and down direction with the lowest central low basis weight region as the base point. The bending deformation is convex toward the skin side. Thereby, the absorbent core material is easily fitted along the wearer's excretory opening and the buttocks of the buttocks.

In the pants type absorbent article, it is preferable that the second side of the back side portion is provided on the lower side in the up-and-down direction of the rear side low basis weight region, and the second base portion having an average basis weight higher than the rear side low basis weight region is provided. High basis weight area.

According to such a pants-type absorbent article, even if a large force acts on the absorbent core material in the crotch portion, a part of the force is relieved in the second buttocks high basis weight region, and it is easy to suppress A large force is transmitted from the crotch side to the hip side. Thereby, the fit of the absorbent core material can be further improved.

===implementation form ===
In the following, as an example of the [pants-type absorbent article] of the present invention, a disposable disposable diaper 1 (hereinafter also referred to as [diaper 1]) will be described as an example. However, the pants-type absorbent article of the present invention can be used, for example, as a disposable disposable diaper for children, a physiological product (short-type sanitary napkin), or the like.

<<The whole structure of the disposable diaper 1>>
Fig. 1 is a schematic perspective view of the paper diaper 1. Fig. 2 is a schematic plan view of the disposable diaper 1 viewed from the non-skin side and in an expanded state. Fig. 3 is a schematic sectional view taken along line II of Fig. 2; In addition, the [elongated state] of the disposable diaper 1 is a state in which the disposable diaper 1 is stretched to be wrinkle free, and the dimensions of the members constituting the disposable diaper 1 (for example, the exterior member 20 to be described later) are elongated until the member is A state in which the size of the body is uniform or close to the size.

The disposable diaper 1 has an up-and-down direction, a left-right direction, and a front-back direction which mutually cross, and has the thickness direction which laminated each member as shown in FIG. In the up-and-down direction, the side to be the wearer's waist side is set to the upper side, and the side to be the wearer's crotch is set to the lower side. In the front-rear direction, the side to be the abdomen side of the wearer is set to the front side, and the side to be the back side of the wearer is set to the rear side. In the thickness direction, the side that abuts the wearer's body is referred to as the skin side, and the opposite side is referred to as the non-skin side. Further, in the unfolded state of Fig. 2, the disposable diaper 1 has a longitudinal direction and a width direction which intersect each other. The longitudinal direction is in the direction of the up and down direction, and the width direction is the same direction as the left and right direction.

The disposable diaper 1 has an absorbent main body 10 having a rectangular shape in plan view, and a non-skin side outer member 20 located on the absorbent main body 10. The exterior member 20 has the abdominal side exterior member 21 (front side belt portion 21) on the front side in the front-rear direction of FIG. 1, and the back side exterior member 22 (rear side belt portion 22) on the rear side in the front-rear direction. And the crotch exterior member 23 (the crotch member 23) to which the members are attached. The aforementioned members adjacent in the thickness direction are joined by an adhesive or the like.

Further, the front side belt portion 21 is located on one end side in the longitudinal direction of the absorbent body 10, and the rear side belt portion 22 is located on the other end side in the longitudinal direction of the absorbent body 10. In the longitudinal direction of the absorbent body 10, the side where the front side belt portion 21 exists is referred to as the front side, and the side where the rear side belt portion 22 exists is referred to as the rear side. That is, the front side belt portion 21 is located at the front side upper end portion of the absorbent body 10, and the rear side belt portion 22 is located at the rear side upper end portion of the absorbent body 10. Further, the crotch member 23 is located closer to the skin side than the front side belt portion 21 and the rear side belt portion 22.

Further, in the disposable diaper 1 of the present embodiment, the exterior member 20 is composed of three members, but the invention is not limited thereto. For example, the front side belt portion 21, the rear side belt portion 22, and the crotch member 23 may be one member. Moreover, it is also possible to have a structure in which the crotch member 23 is not provided, and a member different from the exterior member 20 is further laminated on the side of the outer member 20 closer to the non-skin side.

In the unfolded state of the disposable diaper 1 shown in FIG. 2, the absorbent main body 10 is folded forward and backward at a predetermined position CL in the longitudinal direction, and the left and right sides of the front side belt portion 21 in the left-right direction and the left and right direction of the rear side belt portion 22 are formed. Both side portions are joined by welding or the like, thereby being formed into a pants type as shown in FIG. In other words, the longitudinal direction of the absorbent body 10 is along the vertical direction of the disposable diaper 1, and the front side belt portion 21 and the rear side belt portion 22 are connected in a ring shape to form a waist opening 1a and a pair of foot opening 1b. Hereinafter, a region where the front side belt portion 21 and the rear side belt portion 22 are joined is referred to as an end portion joining region 24.

In the present specification, the portion of the absorbent body 10 (absorbent core member 11) that is bent at the predetermined position CL, which is bent toward the front side, is referred to as a [front side portion 10F], and a portion that is bent toward the rear side is referred to as a portion that is bent toward the rear side. It is [rear side 10R]. That is, a region in which the absorbent body 10 (absorbent core member 11) is more forward than the predetermined position CL in the longitudinal direction of FIG. 2 is referred to as [front side portion 10F], and will be more predetermined. The area on the rear side of the position CL is referred to as [rear side portion 10R].

As shown in FIG. 3, the absorbent main body 10 has an absorbent core member 11, a top sheet 12 on the skin side of the absorbent core member 11, and a back sheet 13 on the non-skin side of the absorbent core member 11. Fig. 4A is a schematic plan view of the absorbent body 10 in a developed and stretched state as seen from the skin side. Fig. 4B is a cross-sectional view taken along line A-A of Fig. 4A. In addition, in FIG. 4B, for the simplification of description, the low basis weight region (described later) provided in the absorptive core material 11 is not shown.

The absorbent core material 11 is a member that absorbs and holds excretion liquid such as urine, and is formed, for example, by a liquid-absorbent fiber such as pulp fibers in which a superabsorbent polymer (SAP) is mixed. The absorbent core member 11 of the present embodiment has a reduced diameter portion 11c having a narrow width in the left-right direction between the front end and the rear end in the longitudinal direction, and has an hourglass clock shape as seen in plan view in FIG. 4A. Further, in the absorbent core member 11, various low basis weight regions, that is, regions having a lower basis weight than the periphery, are formed. The details of the low basis weight region will be described later. Further, the absorbent core member 11 may be coated with the outer peripheral surface thereof by a liquid permeable sheet such as a tissue or a nonwoven fabric.

The top sheet 12 is a liquid permeable sheet, and for example, a hydrophilic hot air non-woven fabric, a spunbonded nonwoven fabric, or the like can be used. The back sheet 13 is a two-layer structure of the liquid-impermeable sheet 13a and the hydrophobic sheet 13b disposed on the non-skin side. As the liquid-impermeable sheet 13a, for example, a resin film or the like can be used, and as the hydrophobic sheet 13b, for example, a flexible hydrophobic nonwoven fabric or the like can be used. Further, the back sheet 13 may have a single layer structure of the liquid-impermeable sheet 13a.

Side sheets 14 are provided on both sides of the back sheet 13 in the left-right direction. The side sheet 14 extends outward in the left-right direction from both ends 11es and 11es of the absorbent core member 11 in the left-right direction, and the both ends 10es and 10es of the absorbent body 10 in the left-right direction serve as a folding position, and are oriented in the left-right direction. The skin side in the inner side and the thickness direction is folded back, thereby forming a pair of leakage preventing wall portions 40. In the leakage preventing wall portion 40, the leakage preventing wall elastic members 41 and 42 such as rubber threads are fixed in a state of being elongated along the longitudinal direction (vertical direction) of the absorbent body 10. The leakage preventing wall elastic members 41 and 42 are contracted in the longitudinal direction, so that the pair of leakage preventing wall portions 40 are erected toward the skin side at both end portions of the absorbent body 10 in the left-right direction to prevent leakage of the disposable diaper 1. The wall functions. In addition, the back sheet 14 (liquid permeable sheet 13b) may be extended to the outer side in the left-right direction of the absorbent core member 11 without providing the side sheet 14, thereby forming the leakage preventing wall portion 40.

As shown in FIG. 2, the front side belt portion 21 and the rear side belt portion 22 respectively have waistline regions 211 and 221 in which the end joint regions 24 are present in the up and down direction, and the crotch side on the lower side of the waist regions 211 and 221, respectively. Areas 212, 222. The waist regions 211 and 221 are rectangular in plan view. The crotch side regions 212 and 222 are formed in a substantially trapezoidal shape, and the outer edge portion has inclined portions 212s and 222s that are inclined to the lower side in the up-and-down direction and to the inner side in the left-right direction. That is, the lateral width of the crotch side regions 212, 222 is narrowed toward the lower side. Further, in the present embodiment, the crotch side region 222 of the rear side belt portion 22 is larger than the crotch side region 221 of the front side belt portion 21, and the wearer's buttocks can be widely covered.

As shown in FIG. 3, the front side belt portion 21 and the rear side belt portion 22 respectively have skin side sheets 213 and 223 on the skin side, non-skin side sheets 214 and 224 on the non-skin side, and between the sheets. And at least the stretchable nonwoven fabrics 215 and 225 having the stretchability in the left-right direction of the disposable diaper 1.

The skin side sheets 213 and 223 and the non-skin side sheets 214 and 224 are preferably flexible sheets. For example, a spunbonded nonwoven fabric, an SMS nonwoven fabric, or the like can be used.

The stretchable nonwoven fabrics 215 and 225 are, for example, a polyurethane (PP) having a polyurethane elastomer having elastic thermoplastic fibers and a polyolefin resin having inelastic thermoplastic resin fibers. A non-woven fabric having a suitable extension process such as gear extension is implemented. By this stretching process, the stretchable nonwoven fabrics 215 and 225 are made to have stretchability in a predetermined direction. Further, the stretching process may be performed by extending in a direction orthogonal to each other, or may be an extension process only in a predetermined direction. In the case where the stretching treatment is performed only in the predetermined direction, the stretchability in the predetermined direction is generated. However, the orientation of all the fibers is not necessarily only in the predetermined direction, and therefore the stretchability is also generated in the direction orthogonal to the predetermined direction.

The skin side sheets 213 and 223, the non-skin side sheets 214 and 224, and the stretchable nonwoven fabrics 215 and 225 are joined by a plurality of welded portions 25a and 25b (for example, regions in which ultrasonic welding is performed). The skin feels soft, for example, by bonding with a curing adhesive. In addition, the stretchable nonwoven fabrics 215 and 225 are contracted between the welded portions 25a and 25b, and the skin side sheets 213 and 223 and the non-skin side sheets 214 and 224 are bent outward in the thickness direction. In other words, the skin side sheets 213 and 223 and the non-skin side sheets 214 and 224 are bulged between the welded portions 25a and 25b, so that the skin feels softer and visually gives the user a soft impression. .

With such a configuration, the entire front belt portion 21 and the rear belt portion 22 are stretchable in the left-right direction (and the vertical direction) of the disposable diaper 1. A region in which the front side belt portion 21 is stretched in the left-right direction is referred to as a front side stretch region 21s, and a region in which the rear side belt portion 22 is stretched in the left-right direction is referred to as a rear side stretch region 22s (refer to the shaded portion of FIG. 5). ). Further, the welded portions 25a and 25b are dispersed at a relatively narrow interval as shown in Fig. 2 . Therefore, in the disposable diaper 1 of the present embodiment, fine protrusions (wrinkles) extending in a plurality of directions can be generated, and wrinkles (longitudinal wrinkles) in one direction peculiar to the disposable diaper can be prevented, so that the appearance of the disposable diaper 1 is excellent.

Further, a stretchable film may be used instead of the stretchable nonwoven fabrics 215 and 225. However, since the thickness of the stretchable film is substantially equal, the protrusions of the skin-side sheets 213 and 223 and the non-skin side sheets 214 and 224 between the welded portions 25a and 25b are easily crushed. On the other hand, since the thickness of the stretchable nonwoven fabrics 215 and 225 is increased between the welded portions 25a and 25b, the protrusions of the skin-side sheets 213 and 223 and the non-skin side sheets 214 and 224 are less likely to be crushed, and the skin feel can be maintained. Softness, aesthetics, etc.

Further, in the region in which the welded portions 25a and 25b are dispersed, the first dispersed region X and the other second dispersed region Y which are overlapped with the absorbent body 10 in the thickness direction can be used for the welded portions 25a and 25b. The shape and the ratio of the welded portions 25a and 25b per unit area are different. In addition, in FIG. 2, in the first dispersion existence region X, the substantially rectangular-shaped welded portions 25a which are inclined by 45 degrees or -45 degrees in the left-right direction are alternately arranged. Further, in the second dispersed region Y, the circular welded portion 25b is arranged in a zigzag shape.

Moreover, the area of the welded portion 25b per unit area of the second dispersed existence region Y is smaller than that of the first dispersed region X. Therefore, in the waist regions 211 and 221 which are prone to problems such as sweat and suffocation, it is possible to prevent the air permeability from being impeded by the welded portion 25b, and it is possible to ensure appropriate air permeability. In addition, in the first dispersion existing region X overlapping with the absorbent main body 10, the contraction of the front side belt portion 21 and the rear side belt portion 22 is appropriately suppressed, and the contraction of the absorbent main body 10 in the left-right direction can be reduced.

Further, in the front side belt portion 21 and the rear side belt portion 22, a plurality of waist elastic members 26 such as rubber threads are disposed in a region along the waist opening 1a. Similarly, a plurality of foot elastic members 27 such as rubber threads are disposed along the region of the foot opening 1b. That is, the waist circumference and the foot circumference of the disposable diaper 1 are firmly adhered to the wearer's body by the waist elastic member 26 and the foot elastic member 27, thereby preventing the diaper 1 from slipping and leaking from the foot circumference. Wait. In addition, since the other portions are gently attached to the wearer's body by the stretchable nonwoven fabrics 215 and 225, the tightening feeling can be reduced.

The crotch member 23 is formed in a slightly hourglass clock shape in a plan view in which the central portion in the longitudinal direction is curved toward the inner side in the left-right direction. Further, as shown in FIG. 3, the crotch member 23 has a skin side sheet 231 on the skin side, a non-skin side sheet 232 on the non-skin side, and a sheet 232 between the sheets and in the up and down direction of the sheet diaper 1. A stretchable nonwoven fabric 233 having elasticity (in the longitudinal direction of the absorbent body 10). The sheets 231 to 233 are joined by a plurality of welded portions (for example, the same welded portions 25b as the second dispersed present region Y). In the crotch member 23, a region in which the stretchability in the vertical direction is generated is referred to as a crotch expansion-contraction region 23s (see a hatched portion in FIG. 5).

By providing the crotch stretchable region 23s, the absorbent core member 11 can be in close contact with the crotch portion of the wearer, and even if the weight of the absorbent core member 11 is increased due to excretion, the disposable diaper 1 can be prevented from sagging. Further, in the region of the crotch member 23 along the foot opening 1b, a plurality of crotch elastic members 28 are disposed, and the crotch member 23 is in close contact with the wearer's foot.

<<About the deformation of the absorbent core material 11>>
It is explained that when the disposable diaper 1 is worn, the absorbent core 11 (absorbent body 10) is deformed in conformity with the action of the wearer's body.

Fig. 5 is a schematic plan view of the disposable diaper 1 in an expanded state, and shows a positional relationship between the various stretchable regions (21s, 22s, 23s) and the absorbent core member 11. Fig. 6 is a plan view of the absorbent core 11 viewed from the skin side.

As shown in FIG. 5, the absorbent core member 11 has a [lower abdomen position 11A] which is located on the wearer's lower abdomen when worn; a [pant area 11B] which is located in the wearer's crotch portion; and is located in the wearer. The hips [buttocks 11C]. In Fig. 5, a portion overlapping the front side belt portion 21 is referred to as a lower abdomen position 11A, a portion overlapping the rear side belt portion 22 is referred to as a buttock position 11C, and a portion between the portions is referred to as a crotch portion 11B. That is, the lower abdomen position 11A is located at a portion of the front side portion 10F of the disposable diaper 1, and the buttocks position 11C is located at a portion of the rear side portion 10R of the disposable diaper 1. Further, the crotch portion 11B is located at a lower end portion of the disposable diaper 1 in the lower direction, and is provided at a portion extending over the front side portion 10F and the rear side portion 10R across the predetermined position CL.

However, the range of the [leg portion 11B] shown in FIG. 5 is only an example, and is not limited thereto. For example, in the longitudinal direction, the region from the lower end of the end joint region 24 of the front belt portion 21 to the lower end of the end joint region 24 of the rear belt portion 22 may be a central region of 1/3. The crotch area.

The absorbent core member 11 is attached to the crotch portion 11B, and has a region where the basis weight of the absorbent core member 11 is lower than that of the surrounding portion, that is, the crotch low basis weight region 36. The crotch low basis weight region 36 is formed by intersecting the vertically long portion 36l in the vertical direction (the longitudinal direction of the absorbent core member) and the laterally long portion 36w in the left-right direction (the width direction of the absorbent core member). Further, the longitudinal portion 361 is provided in the crotch portion 11B, and a plurality of the horizontal length portions 36w are provided at intervals in the left-right direction, and the respective longitudinal portions 361 are spaced apart from each other in the vertical direction.

In addition, the [basis weight] of the absorptive core material 11 means the mass (g/m ² ) of the absorptive core material 11 per unit area (for example, the SAP liquid-absorbent fiber is mixed). The comparison of the base weight of the crotch low basis weight region 36 with the surrounding core region of the absorbent core member 11 can be carried out by a conventional method. For example, there is a method of visually comparing. There is also a method in which the target portion is cut out from the absorbent core material 11 as a sample, and the mass of each sample and the area of each sample are measured, and the mass per unit area is calculated and compared. The other low basis weight regions described below are also the same.

The absorbent core member 11 is easily deformed by the rigidity of the low base region 36 of the crotch and the surrounding region, with the low base weight region 36 as a starting point. Therefore, when the disposable diaper 1 is worn, the absorbent core material 11 is bent by using the low base weight region 36 as a starting point, so that it is easily deformed in conformity with the unevenness of the wearer's body, and it becomes easy to wear. The user's body. In particular, the crotch portion 11B is a portion that is easily subjected to a compressive force in the left-right direction by being caught in the wearer's feet when the disposable diaper 1 is worn. Therefore, by providing the longitudinal portion 36l extending in the vertical direction and the laterally long portion 36w extending in the left-right direction at the crotch portion 11B, the absorbent core member 11 can be easily deformed more easily.

Moreover, as shown in FIG. 6, the absorptive core material 11 is the upper side in the up-down direction and the back side (rear side part 10R) of the front-back direction rather than the crotch low basis weight area 36, and has the absorptive core material compared with the surroundings. The region where the basis weight of 11 is lowered is also [the second pants low basis weight region 37]. The second crotch low basis weight region 37 has substantially the same structure as the crotch low basis weight region 36, and is formed by the longitudinal portion 37l in the up and down direction (the longitudinal direction of the absorbent core member) and in the left and right direction (absorbability). A plurality of horizontally long portions 37w in the width direction of the core material are formed to intersect each other. Further, the second crotch low basis weight region 37 is disposed across the crotch portion 11B and the buttocks 11C. Further, in order to distinguish between the crotch low basis weight region 36 and the second crotch low basis weight region 37, in the following description, the crotch low basis weight region 36 may be referred to as [the first crotch low basis weight region 36]. .

Further, the absorbent core member 11 is on the upper side in the vertical direction of the first crotch low basis weight region 36 and the front side (front side portion 10F) in the front-rear direction, and is in the longitudinal portion 37l of the second crotch low basis weight region 37. Between the left and right directions, there is a region in which the basis weight of the absorptive core material 11 is lower than the circumference, that is, the [central low basis weight region 32]. The center low basis weight region 32 is disposed in the center portion of the absorbent core member 11 in the left-right direction, and is disposed in the vertical direction (the longitudinal direction of the absorbent core member 11). The basis weight is lower than the circumference, and the upper and lower sides are up and down. A slightly rectangular area with a long direction. Similarly, in the center portion in the left-right direction of the upper side in the up-and-down direction and the rear side (rear side portion 10R) in the front-rear direction in the crotch-low-basis weight region 36, a central portion corresponding to the central low-basis weight region 32 is provided. Low basis weight area 33]. In the present embodiment, the absorptive core material 11 is not present in the central low basis weight regions 32 and 33. That is, the central low basis weight regions 32 and 33 are holes through which the absorbent core member 11 penetrates in the thickness direction.

Among the low basis weight regions (32, 33, 36, 37), the second crotch low basis weight region 37 and the central low basis weight region 33 provided on the rear side portion 10R (not provided in the front side portion 10F) are collectively referred to. It is [back side low basis weight area 39] (refer to Fig. 6).

Further, in the rear side portion 10R of the absorbent body 10, the rear side lower basis weight region 39 is closer to the upper side in the up-and-down direction (the rear side in the longitudinal direction), and the base weight is lower than the second pants. (and the central low basis weight area 33) is high [the buttocks high basis weight area 55]. The buttocks high basis weight region 55 is a region continuous in the left-right direction, and the boundary portion between the rear side low basis weight region 39 and the buttocks high basis weight region 55 is inclined obliquely downward from the center in the left-right direction toward both outer sides. Therefore, the buttocks high basis weight region 55 has a region of a slightly U-shaped or V-shaped shape as shown in FIG. 6. Further, the [boundary] of the rear low basis weight region 39 and the buttocks high basis weight region 55 is the upper end (the rear end in the longitudinal direction) of the upper portion 37l of the second crotch low basis weight region 37 in the upper and lower directions. The line (curve) in which the upper end (the rear end in the longitudinal direction) of the lower central basis region 33 is vertically connected is indicated by a broken line in FIG. 6 . Hereinafter, the boundary between the rear low basis weight region 39 and the buttocks high basis weight region 55 is also referred to as a [first boundary portion 55BF].

In addition, the [basis weight] of the rear low basis weight region 39 means the average base of the region surrounded by the vertical portion 371 disposed at both ends in the left-right direction and the broken line at both ends in the vertical direction in FIG. 6 . weight. Similarly, the basis weight of the buttocks high basis weight region 55 refers to the average basis weight of the region sandwiched between the rear low basis weight region 39 and the buttock low basis weight region 38 (described later).

Further, in the rear side portion 10R of the absorbent body 10, the upper side (the rear side in the longitudinal direction) of the upper and lower sides of the buttocks high basis weight region 55 is provided, and the basis weight of the absorbent core member 11 is set to be larger than the circumference. The lower area is also [the low base area 38 of the buttocks]. The buttocks low basis weight region 38 has a structure similar to that of the second crotch low basis weight region 37, and has a longitudinal portion 38l and a horizontally long portion 38w.

The boundary between the buttocks high basis weight region 55 and the buttocks low basis weight region 38 is inclined obliquely downward from the center in the left-right direction toward both outer sides. The [border] of the buttocks high basis weight region 55 and the buttocks low basis weight region 38 is a line that continuously connects the lower end (the front end in the longitudinal direction) of the vertical portion 38l of the buttocks low basis weight region 38 in the upper and lower directions. (curve), indicated by dotted lines in FIG. Hereinafter, the boundary portion between the buttocks high basis weight region 55 and the buttocks low basis weight region 38 is also referred to as a [second boundary portion 55BR]. In addition, the [basis weight] of the low-weight region 38 of the buttocks refers to the longitudinal end portion 38l and the second boundary portion 55BR disposed at both ends in the left-right direction and the rear edge of the absorbent core member 11 in FIG. The average basis weight of the enclosed area.

Next, the deformation of the absorbent core member 11 when the disposable diaper 1 is worn will be specifically described. Fig. 7 is a schematic perspective view showing the deformation of the absorbent core member 11 when the disposable diaper 1 is worn.

In the center low basis weight regions 32 and 33, the absorbent core member 11 is penetrated in the thickness direction, and the rigidity is minimized. That is, the absorbent core member 11 is in the center low basis weight regions 32 and 33, and the bending deformation is most likely to occur. Therefore, when the disposable diaper 1 is worn, the absorbent core member 11 is sandwiched between the feet of the wearer's crotch, the absorbent core 11 is in the central low basis weight region 32, 33, along the upper and lower sides. The direction (the longitudinal direction of the absorbent core material 11) is bent toward the left and right. Thereby, in the crotch portion 11B between the central low basis weight regions 32 and 33 in the longitudinal direction, as shown in FIG. 7, the absorbent core member 11 is convexly deformed toward the wearer's skin side along the longitudinal direction. The convex portion 11t is formed. That is, the central low basis weight regions 32 and 33 have a function of bending the absorption core member 11 in the longitudinal direction of the crotch portion 11B. The absorbent core member 11 is convexly deformed toward the skin side at the crotch portion 11B, and the convex portion 11t is easily attached to the wearer's excretory opening, the groin of the buttocks, and the like, and the absorbent property of the excrement can be improved in the crotch portion.

Further, in the front side portion 10F, from the crotch portion 11B to the lower abdomen position 11A, the absorbent core member 11 stands up along the curved surface shape of the wearer's abdomen. Further, in the rear side portion 10R, from the crotch portion 11B to the buttock position 11C, the absorbent core member 11 stands up along the curved shape of the wearer's buttocks. Thereby, when the disposable diaper 1 is worn, the absorptive core material 11 can be deformed into the shape like FIG.

Here, when the diaper 1 is worn, when the disposable diaper 1 is worn, in the crotch portion 11B, as described above, the absorbent core 11 is formed to be worn toward the wearer. The skin side is convex, and the convex portion 11t is continuously formed in the vertical direction (the longitudinal direction of the absorbent core member 11). When the convex portion 11t is continuously formed over the entire area in the vertical direction (longitudinal direction), since the convex portion 11t is formed also in the buttock position 11C, the convex portion 11t is in contact with the wearer. The buttocks cause the skin of the buttocks to feel bad. Further, in the waist circumference of the buttocks, a gap is formed between the absorbent core member 11 and the wearer's skin, which may cause leakage of excrement.

On the other hand, in the disposable diaper 1 of the present embodiment, the buttocks high basis weight region 55 is provided on the upper side (the rear side in the longitudinal direction) of the rear side low basis weight region 39 in the upper and lower directions. The absorbent core 11 is not convexly deformed in the region of the upper side (rear side) of the buttocks high basis weight region 55. Specifically, the high-heavy buttocks high basis weight region 55 causes the crotch portion 11B to transmit the force of the absorbent core member 11 to the skin side to be deformed into a convex shape, and the force is transmitted to the buttocks 11C. As a result, in the region higher than the buttocks high basis weight region 55 (the rear side), the center portion of the absorbent core member 11 in the left-right direction is prevented from being convexly deformed toward the wearer's skin, and the absorbent core member 11 can be maintained. In the state of the surface shape of Fig. 7, it stands up toward the buttock side. In particular, the central low basis weight region 33 as the through hole in the rear low basis weight region 39 is the portion of the absorbent core member 11 which has the lowest rigidity and is easily bent, and therefore, is lower in the center than in the center. The weight region 33 is disposed closer to the upper side (the rear side in the longitudinal direction) in the up-and-down direction, and the hip high basis weight region 55 is provided, and it is easy to suppress such a bending influence from being transmitted to the buttocks side, and it is possible to suppress the deterioration of the fit.

Moreover, when the disposable diaper 1 is worn, the crotch portion 11B of the absorbent core member 11 is held by the wearer's feet, and if the wearer moves the foot forward and backward while walking, the right side region and the left side in the left-right direction are used. In the region, the opposing force (shearing force) acts, which is prone to wrinkles or strain. However, in the disposable diaper 1, even if such wrinkles are generated in the crotch portion 11B, wrinkles are less likely to occur in the region on the rear side of the buttocks high basis weight region 55.

As described above, by providing the buttocks high basis weight region 55, it is possible to suppress the force acting on the absorbent core member 11 at the crotch portion 11B from being transmitted to the buttocks 11C on the rear side of the buttocks high basis weight region 55. Therefore, in the crotch portion 11B and the buttocks 11C across the buttocks high basis weight region 55, the absorbent core member 11 is easily deformed differently, and the fit of each region can be improved.

When the absorbent core member 11 is deformed, the force of the absorbent core member 11 to be compressed in the left-right direction is concentrated in the first boundary portion 55BF at the crotch portion 11B, and the first boundary portion 55BF is used as a starting point, and the absorbent core is used. The material 11 stands up to the buttocks side. As a result, the region of the absorbent core member 11 which is higher than the buttocks high basis weight region 55 (the rear side closer to the longitudinal direction) does not become convex like the crotch portion 11B, but faces the wearer's buttocks. Stand up sideways. Therefore, it becomes easy to naturally deform the absorbent core material 11 in accordance with the body shape of the wearer.

In addition, since the first boundary portion 55BF is inclined from the center in the left-right direction toward the both sides and from the rear side in the longitudinal direction, the absorbent core member 11 is higher than the buttocks high basis weight region 55 (longitudinal direction) The area of the rear side is erected obliquely along the inclination of the boundary portion, and is deformed to wrap the buttocks of the wearer. Thereby, the fit of the absorbent core material 11 on the buttocks of the wearer can be improved.

Further, in the disposable diaper 1, a plurality of longitudinal portions 37l are provided in the second crotch low basis weight region 37 constituting the rear low basis weight region 39. This area is a portion where a large force is easily applied between the wearer's feet by the crotch portion 11B, and from the crotch portion 11B to the buttocks 11C, the absorbent core 11 is along the wearer's The part of the curvature of the hips begins to rise. Moreover, in the case where the wearer moves the foot, the area where the wrinkles are likely to occur. Therefore, in the present embodiment, a plurality of longitudinal portions 37l are provided in this region, and the longitudinal core portion 37l is used as a starting point, so that the absorbent core member 11 is easily deformed by bending. Thereby, the absorbent core material 11 can be easily deformed three-dimensionally along the shape of the body near the buttocks of the wearer. Further, by slightly bending and deforming the absorbent core member 11, the force for forming wrinkles on the surface of the absorbent core member 11 can be dispersed to suppress the formation of wrinkles, so that the absorbent core member 11 and the wearer can There is no easy gap between the bodies.

Further, in the disposable diaper 1, at least a part of the second crotch low basis weight region 37 (the rear low basis weight region 39) overlaps with the rear side expansion and contraction region 22s of the rear side belt portion 22. In FIG. 5, the second crotch low basis weight region 37 and the rear side expansion and contraction region 22s are repeated in the region closer to the inner side in the left-right direction than the first boundary portion 55BF and the lower side (the front side in the longitudinal direction) in the vertical direction. Therefore, when the disposable diaper 1 is worn, the contraction force in the left-right direction of the second crotch low basis weight region 37 and the rear side stretchable region 22s acts on the overlapping portion. By this, in the region held by the first boundary portion 55BF in the left-right direction, the absorbent core member 11 is easily contracted and deformed, and the external force generated by the action of the wearer's foot or the like can be easily buffered. Therefore, it becomes easy to suppress the force transmission to the buttock side.

Further, in the disposable diaper 1, the buttocks high basis weight region 55 also overlaps with the rear side stretchable region 22s of the rear side belt portion 22. Such a region having a high rigidity such as the buttocks high basis weight region 55 is basically a region that is not easily deformed and easily maintains a planar shape, and therefore, it is difficult to fit along the arc of the wearer's buttocks. On the other hand, in the present embodiment, the contraction force of the rear side expansion and contraction region 22s acts to easily deform the buttocks high basis weight region 55 itself. Further, the contraction force in the right and left direction acts on the non-skin side of the buttocks high basis weight region 55, and the buttocks high basis weight region 55 is pressed against the wearer's skin. Thereby, the buttocks high basis weight region 55 can be deformed to form a curved surface along the curvature of the buttocks of the wearer, and it is easy to adhere to the wearer's skin, and the fit of the absorbent core material 11 of the buttocks can be further improved.

Further, at least a part of the second crotch low basis weight region 37 (the rear low basis weight region 39) is overlapped with the rear side belt portion 22, so that it is easy to secure the second crotch low basis weight region 37 in the overlapping portion. The rigidity of the non-skin side. As a result, when the contracting force in the left-right direction acts on the absorbent core member 11, the absorbent core member 11 is more likely to be bent toward the skin side than the non-skin side, so that the above-described convex deformation is likely to occur. In addition, since the second crotch low basis weight region 37 itself has low rigidity, it can be freely deformed. On the other hand, the back side belt portion 22 on the non-skin side is laminated with a plurality of sheet members (213, 214, etc.). In addition, even if a large force acts on the low base area 37 of the second crotch due to the action of the wearer's foot or the like, the second crotch can be used in the low basis weight region 37. The absorbent core 11 is prevented from being broken or greatly distorted. In other words, even if the absorbent core member 11 has an excessive external force, the external belt can be cushioned by the rear belt portion 22, and the absorbent core member 11 can be prevented from being damaged.

Further, in the rear side portion 10R of the absorbent core member 11, the upper side (the rear side in the longitudinal direction) of the upper and lower side of the buttocks high basis weight region 55 is provided, and the buttocks low basis weight region 38 is provided to allow the absorbent core to be provided. The fit of the material 11 is improved. As described above, the absorbent core member 11 of the present embodiment is completely differently deformed in the region on the upper side (the buttock side) and the lower side (the crotch side) via the buttocks high basis weight region 55. By providing a low basis weight region in each region, the absorbent core member 11 can be easily deformed more naturally. For example, in the region of the absorbent core member 11 that is higher than the buttocks high basis weight region 55, the buttocks low basis weight region 38 is formed into a curved shape so as to wrap the wearer's buttocks, thereby improving the buttocks. Closeness.

Further, the buttocks low basis weight region 38 has a plurality of longitudinal portions 38l. However, as shown in FIG. 6, the longitudinally long portions 38l are provided in the vertical direction from the second boundary portion 55BR to the absorbent core member. The upper end of 11 (the rear side in the longitudinal direction). That is, the lower end position of the vertical portion 38l in the upper and lower directions is the intersection with the second boundary portion 55BR, and the upper end position of the vertical portion 38l in the upper and lower directions is the intersection with the upper end of the absorbent core member 11. When the longitudinal portion 38l is provided to reach the upper end of the absorbent core member 11, the stress acting on the buttocks high basis weight region 55 is easily avoided toward the upper end side of the absorbent core member 11, and it is easy to suppress at the buttock position 11C. The absorbent core material 11 generates wrinkles and strain. Further, since the upper end position of the vertically long portion 38l is the same as the upper end position of the absorbent core member 11 in the vertical direction, a portion having a lower basis weight and lower rigidity is formed on the upper end edge of the absorbent core member 11. The upper end portion becomes easily deformed softly. Therefore, the upper end portion of the absorbent core member 11 is easily deformed in accordance with the waist shape of the buttocks side of the wearer, and the skin of the waistline can be softened. Further, it is not necessary to provide all of the plurality of longitudinal portions 38l so as to reach the upper end of the absorbent core member 11, as long as a part of the elongated portion 38l reaches the upper end of the absorbent core member 11.

Further, in the disposable diaper 1, the second boundary portion 55BR is formed in a substantially V shape (U-shape) which is inclined obliquely downward from the center in the left-right direction toward the both outer sides. Therefore, in the absorbent core member 11, the region higher than the buttocks high basis weight region 55 (the rear side in the longitudinal direction) is inclined obliquely along the inclination of the second boundary portion 55BR, and it is easy to form a wrap-around wear. The curved surface of the hip of the person's hip.

In addition, the inclination angle of the second boundary portion 55BR in the left-right direction is smaller than the inclination angle of the first boundary portion 55BF in the left-right direction. Here, the angle of inclination in the left-right direction means the angle of the smaller of the angle formed by the boundary members 55BF and 55BR in the left-right direction in the state in which the absorbent core member 11 is stretched as shown in FIG. In FIG. 6, the inclination angle θ55BR of the second boundary portion 55BR is smaller than the inclination angle θ55BF of the first boundary portion 55BF (θ55BR<θ55BF).

By increasing the inclination angle θ55BF by the first boundary portion 55BF close to the crotch portion 11B, the amount of deformation of the absorbent core member 11 at the boundary portion can be increased. Therefore, the absorbent core material 11 in which the crotch portion 11B is convexly deformed can be easily formed to naturally stand up toward the buttocks side. Further, in the second boundary portion 55BR, the amount of deformation of the absorbent core member 11 is smaller than that of the first boundary portion 55BF. Therefore, by reducing the inclination angle θ55BR, the absorbent core member 11 can easily follow the circumference of the buttocks. The arc is gently deformed.

Further, as shown in FIG. 6, the length W55BR of the second boundary portion 55BR in the left-right direction is longer than the length W55BF of the first boundary portion 55BF in the left-right direction (W55BR>W55BF). Thereby, the area where the absorbent core material 11 can be deformed can be made wider in the second boundary portion 55BR closer to the buttocks of the wearer. Therefore, it is easy to cover a wider area of the buttocks by the absorbent core material 11, and the fit of the buttocks region can be further improved.

Further, in the disposable diaper 1, at least a part of the rear low basis weight region 39 is overlapped with the crotch stretchable region 23s. In the rear low-basis region 39 of the absorbent core member 11, the stretchability in the vertical direction acts from the non-skin side, whereby the absorbent core member 11 is deformed along the wearer in the rear low basis weight region 39. The lower part of the skull is curved. Moreover, since the absorbent core material 11 is easily bent toward the skin side, deformation to the convex shape can be promoted.

Further, between the rear side low basis weight region 39 and the first crotch low basis weight region 36, the basis weight is higher than the rear side low basis weight region 39 and the first crotch low basis weight region 36. 2 hip high basis weight area 56]. The second buttocks high basis weight region 56 is a high basis weight region which is slightly the same as the buttocks high basis weight region 55, and is formed continuously in the left-right direction, and the rear low-weight region 39 and the first pants have a low basis weight region 36. The boundary portion has a slightly U-shaped or V-shaped region which is inclined obliquely downward from the center in the left-right direction toward both outer sides. By providing the second buttocks high basis weight region 56 at a position closer to the crotch portion 11B than the buttocks high basis weight region 55, even if the crotch portion 11B is largely affected by the wearer's ankle, etc., A part of the force is also relieved in the second buttocks high basis weight region 56, and it is easy to suppress a large force from being transmitted to the buttocks 11C. Therefore, the fit of the absorbent core material 11 can be further improved.

The embodiments of the present invention have been described above, but the above embodiments are intended to facilitate the understanding of the embodiments of the present invention and are not intended to limit the invention. Further, the present invention can be modified and improved without departing from the scope of the technical idea, and the present invention naturally includes equivalents thereof.

1‧‧‧Pants disposable diapers (paper diapers, shorts type absorbent articles)

1a‧‧‧waist opening

1b‧‧‧foot opening

10‧‧‧Absorbable ontology

10F‧‧‧ front side

10R‧‧‧ rear side

11‧‧‧Absorbent core material

11A‧‧‧ lower abdomen

11B‧‧‧ Pants

11C‧‧‧Hip position

11c‧‧‧Reducing section

11t‧‧‧ convex

12‧‧‧Top sheet

13‧‧‧ Back sheet

14‧‧‧ side flakes

20‧‧‧ Exterior components

21‧‧‧ Front side belt part (abdominal side exterior member)

21s‧‧‧ front side expansion zone

211‧‧ ‧ Waist area

212‧‧‧The crotch side area

213‧‧‧ Skin side sheet

214‧‧‧Non-skin side sheet

215‧‧‧Flexible non-woven fabric

22‧‧‧Back side belt part (back side exterior member)

22s‧‧‧Back side expansion area

221‧‧ ‧ Waist area

222‧‧‧ 裆 裆 side area

223‧‧‧Skin side sheet

224‧‧‧Non-skin side sheet

225‧‧‧Flexible non-woven fabric

23‧‧‧Pants components (pants outer components)

23s‧‧‧ pants stretch area

231‧‧‧ Skin side sheet

232‧‧‧Non-skin side sheet

233‧‧‧Flexible non-woven fabric

24‧‧‧End joint area

25a, 25b‧‧‧welding

26‧‧‧Waist elastic members

27‧‧‧foot elastic members

28‧‧‧Pants elastic members

32‧‧‧Central low basis weight area

33‧‧‧Central low basis weight area

36‧‧‧ Pants low base area (1st crotch low basis weight area)

36l‧‧‧Long section

36w‧‧‧ horizontal section

37‧‧‧2nd pants low basis weight area

37l‧‧‧Long section

37w‧‧‧ horizontal section

38‧‧‧ low hip area

38l‧‧‧Long section

38w‧‧‧ horizontal section

39‧‧‧Back side low basis weight area

40‧‧‧Leakproof wall

41‧‧‧Leak-proof wall elastic members

42‧‧‧Leak-proof wall elastic member

55‧‧‧Hip height area

55BF‧‧‧1st boundary

55BR‧‧‧2nd boundary

56‧‧‧2nd buttocks high basis weight area

CL‧‧‧Predetermined location

θ55BF‧‧‧ tilt angle

θ55BR‧‧‧ tilt angle

Fig. 1 is a perspective view showing a disposable disposable diaper 1 for a pants type.

Fig. 2 is a schematic plan view of the disposable diaper 1 viewed from the non-skin side and in an expanded state.

Fig. 3 is a schematic cross-sectional view taken along line I-I of Fig. 2;

Fig. 4A is a schematic plan view of the absorbent body 10 in a developed and stretched state as seen from the skin side. Fig. 4B is a cross-sectional view taken along line A-A of Fig. 4A.

Fig. 5 is a schematic plan view of the disposable diaper 1 in an expanded state, and shows a positional relationship between the various stretchable regions (21s, 22s, 23s) and the absorbent core member 11.

Fig. 6 is a plan view of the absorbent core 11 viewed from the skin side.

Fig. 7 is a schematic perspective view showing the deformation of the absorbent core member 11 when the disposable diaper 1 is worn.

Claims (14)

A pants-type absorbent article having an up-and-down direction, a left-right direction, and a front-rear direction that intersect each other, and is provided with: The absorptive main body is provided with an absorbent core material disposed along the vertical direction, and is bent forward and backward at a lower end portion in the vertical direction, and is characterized in that: The absorbent core member has a rear side portion that is bent toward the rear side in the front-rear direction, The absorbent core is attached to the rear side portion and has: The average basis weight is lower than the surrounding area and the lower side basis weight region; and The upper side of the low-weight region in the rear side is closer to the upper side in the up-and-down direction, and the average basis weight is higher than the low-weight region of the back side of the low-weight region. At least a part of the boundary portion between the rear side low basis weight region and the hip high basis weight region is inclined obliquely downward from the center in the left-right direction toward both outer sides. For example, in the shorts type absorbent article of claim 1 of the patent scope, The rear side low basis weight region has a longitudinal portion along the vertical direction. Such as a shorts type absorbent article of claim 1 or 2, wherein a rear side belt portion that is coupled to the absorbent body and has a rear side expansion and contraction region that expands and contracts in the left-right direction. At least a part of the rear low basis weight region is overlapped with the rear side expansion and contraction region in the vertical direction. For example, the shorts type absorbent article of claim 3, wherein In the up-and-down direction, the hip high basis weight region overlaps with the rear side stretch region. A pants-type absorbent article according to any one of claims 1 to 4, wherein a rear side belt portion that is coupled to the absorbent body and has a rear side expansion and contraction region that expands and contracts in the left-right direction. At least a part of the rear low basis weight region is overlapped with the rear side belt portion in the vertical direction. A pants-type absorbent article according to any one of claims 1 to 4, wherein The aforementioned absorbent core is attached to the rear side portion, It is higher than the above-mentioned high base area of the buttocks, and has a low basis weight region with a lower average base weight than the surrounding area. Such as a shorts type absorbent article of claim 6 of the patent scope, wherein At least a part of the boundary portion between the buttocks high basis weight region and the buttocks low basis weight region is inclined obliquely downward from the center in the left-right direction toward both outer sides. For example, in the shorts type absorbent article of claim 7 of the patent scope, The angle of the smaller of the angle formed by the boundary between the rear low base region and the hip high basis weight region in the left and right direction is The boundary between the buttocks high basis weight region and the buttocks low basis weight region is larger than the angle of the smaller of the angles formed by the left and right directions. For example, in the shorts type absorbent article of claim 6 or 7, wherein The length of the boundary portion between the buttocks high basis weight region and the buttocks low basis weight region in the left-right direction is longer than the boundary between the rear side low basis weight region and the hip high basis weight region in the left-right direction. long. A pants-type absorbent article according to any one of claims 6 to 9, wherein The low butt weight region of the buttocks has a plurality of longitudinal portions along the vertical direction. In the vertical direction, at least a part of the upper end position of the longitudinal portion is the same as the upper end position of the absorbent core. A pants-type absorbent article according to any one of claims 1 to 10, wherein The rear low basis weight region has a longitudinal portion along the vertical direction and a plurality of horizontal portions that intersect the longitudinal portion. A pants-type absorbent article according to any one of claims 1 to 11, wherein When worn, it is located in the crotch portion of the wearer's crotch, and has a crotch member which is laminated on the non-skin side closer to the absorbent core and has a crotch expansion and contraction region which is stretched and contracted in the vertical direction. At least a portion of the aforementioned rear low basis weight region is overlapped with the aforementioned crotch stretch region. A pants-type absorbent article according to any one of claims 1 to 12, wherein In the rear side portion, a center low basis weight region that penetrates the absorbent core material in the vertical direction is provided on a lower side of the up-and-down direction of the buttocks high basis weight region and a center in the left-right direction. A pants-type absorbent article according to any one of claims 1 to 13, wherein In the rear side portion, a second buttocks high basis weight region having an average basis weight higher than the rear side low basis weight region is provided on the lower side in the vertical direction of the rear low basis weight region.