Absorbent article

Abstract

To provide an absorbent article capable of suppressing slipping of the absorbent article.SOLUTION: A front girth area (S1) of an absorbent article (1) is disposed with a plurality of areas into which the front girth area is divided in a longitudinal direction (L). The plurality of areas includes: a front waist area (F11) positioned at 0-25% behind a front edge (S1F) of the front girth area with respect to a total longitudinal length of the front girth area; an upper abdomen area (F12) positioned at 25-50% behind the front edge (S1F) of the front girth area with respect to the total longitudinal length of the front girth area; a lower abdomen area (F13) positioned at 50-85% behind the front edge of the front girth area with respect to the total longitudinal length of the front girth area; and a front leg area (F14) positioned at 75-100% behind the front edge of the front girth area with respect to the total longitudinal length of the front girth area. A contraction length in a width direction of the lower abdomen area (F13) is longer than a contraction length in the width direction of the front leg area (F14).SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to absorbent articles such as disposable diapers.

Background Art

[0002] Absorbent articles such as disposable diapers are worn so as to cover the abdomen and back of the body and are configured to suppress slippage (for example, Patent Document 1 below). The absorbent article of Patent Document 1 is configured so that the absorbent article is difficult to slip with respect to the movement of the wearer's body. More specifically, in the back waist region, a first elastic portion and a second elastic portion located on the lower thigh side than the first elastic portion are provided. The first elastic portion and the second elastic portion are arranged at intervals in the longitudinal direction. The elastic stress of the first elastic portion and the elastic stress of the second elastic portion are greater than the elastic stress of the region between the first elastic portion and the second elastic portion. Therefore, in a state where the absorbent article is worn, the first elastic portion and the second elastic portion are in close contact with the body, and the region between the first elastic portion and the second elastic portion is not in relatively close contact with the body.

[0003] For example, when the wearer moves by bending and stretching the legs, the second elastic portion located on the lower thigh side in the back waist region is pulled to the lower thigh side. Further, as the second elastic portion moves to the lower thigh side, the region between the first elastic portion and the second elastic portion is also pulled to the lower thigh side. The region between the first elastic portion and the second elastic portion has a relatively small elastic stress and is not in close contact with the body. Therefore, when a force is applied in the longitudinal direction to the back waist region of the disposable diaper by the movement of the wearer's body, the region between the first elastic portion and the second elastic portion becomes a buffer region, and the stretching and shrinking changes of the skin due to the movement of the body can be absorbed. Therefore, the first elastic portion can be prevented from slipping to the lower thigh side. Further, the first elastic portion and the third elastic portion are continuous, and the second elastic portion and the third elastic portion are continuous. That is, the elastic portions in the front waist region and the elastic portions in the back waist region are arranged so as to surround the wearer's waist. Therefore, when the second elastic portion slips to the lower thigh side, it can be pulled back to the original position by the third elastic portion. In this way, the absorbent article of Patent Document 1 is configured to suppress slippage.

Prior Art Documents

Patent Document

[0004]

Patent Document 1

Summary of the Invention

[0005] The need to suppress the displacement of absorbent articles is great, and there is still room for improvement. In particular, if the absorbent article does not fit the wearer's body shape, displacement may occur at the non-fitting portion, and the entire absorbent article may be displaced during wear. Therefore, an object of the present invention is to provide an absorbent article that can further suppress the downward displacement of the absorbent article.

Means for Solving the Problems

[0006] An absorbent article according to one aspect has a longitudinal direction and a width direction that are orthogonal to each other, a front waist region, a rear waist region, and a crotch region disposed between the front waist region and the rear waist region, and an absorbent core disposed at least in the crotch region. In the front waist region and the rear waist region, a plurality of regions obtained by dividing the front waist region and the rear waist region in the longitudinal direction are provided. The plurality of regions include a front waist region located 0 to 25% rearward from the front edge of the front waist region with respect to the entire longitudinal length of the front waist region, an upper abdomen region located 25 to 50% rearward from the front edge of the front waist region with respect to the entire longitudinal length of the front waist region, a lower abdomen region located 50 to 75% rearward from the front edge of the front waist region with respect to the entire longitudinal length of the front waist region, and a front leg region located 75 to 100% rearward from the front edge of the front waist region with respect to the entire longitudinal length of the front waist region. The contraction length in the width direction of the lower abdomen region is longer than the contraction length in the width direction of the front leg region.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

[0008] (1) Outline of the Embodiment At least the following matters become clear from the description of this specification and the accompanying drawings. The absorbent article according to one aspect has a longitudinal direction and a width direction that are orthogonal to each other, a front waist region, a rear waist region, and a crotch region disposed between the front waist region and the rear waist region, and an absorbent core disposed at least in the crotch region. In the front waist region and the rear waist region, a plurality of regions that divide the front waist region and the rear waist region in the longitudinal direction are provided. The plurality of regions include a front waist region located 0 to 25% rearward of the front end edge of the front waist region with respect to the total length of the front waist region in the longitudinal direction, an upper abdomen region located 25 to 50% rearward of the front end edge of the front waist region with respect to the total length of the front waist region in the longitudinal direction, a lower abdomen region located 50 to 75% rearward of the front end edge of the front waist region with respect to the total length of the front waist region in the longitudinal direction, and a front leg region located 75 to 100% rearward of the front end edge of the front waist region with respect to the total length of the front waist region in the longitudinal direction. The shrinkage length in the width direction of the lower abdomen region is longer than the shrinkage length in the width direction of the front leg region. The body shape of the wearer changes in the circumferential dimension around the body in the longitudinal direction of the absorbent article. As a result of the applicant's intensive research, it has been found that the circumferential dimension around the body of the wearer's abdomen is short near the depression at the lower end of the abdomen and gradually increases from the depression at the lower end toward the crotch side. In the absorbent article, a region with a long shrinkage length has a long shrinkage length and a large change due to shrinkage in the process of changing from the extended state to the natural state. Since the shrinkage length of the lower abdomen region that contacts the portion (depression) where the circumferential dimension around the body is short in the abdomen is long, and the shrinkage length of the front leg region that contacts the portion that bulges more than the depression is relatively short, the absorbent article itself deforms into a shape that follows the unevenness of the body. By disposing a portion with a short dimension of the absorbent article in the depression of the body, the absorbent article can be caught in the depression, thereby suppressing the displacement of the absorbent article.

[0009] According to a preferred embodiment, the contraction length in the width direction of the lower abdominal region is longer than the contraction length in the width direction of the upper abdominal region. The body circumference dimension of the wearer's abdomen is shorter near the recess at the lower end of the abdomen and gradually increases upward from the recess at the lower end. According to this embodiment, since the contraction length of the lower abdominal region is long and the contraction lengths of the upper abdominal region and the front leg region that abut on the portion swelling from the recess are relatively short, the absorbent article itself deforms into a shape along the unevenness of the body. By arranging a portion with a short dimension of the absorbent article in the recess of the body, the absorbent article can be caught in the recess, and displacement of the absorbent article can be suppressed.

[0010] According to a preferred embodiment, the contraction length in the width direction of the upper abdominal region is longer than the contraction length in the width direction of the front waist region. The body circumference dimension of the wearer's abdomen is shorter near the recess at the lower end of the abdomen and gradually increases upward from the recess at the lower end. According to this embodiment, the body circumference dimension of the absorbent article is longer in the order of the lower abdominal region, the upper abdominal region, and the front waist region in the natural state. By deforming the absorbent article itself into a shape along the swelling of the abdomen, displacement can be suppressed.

[0011] According to a preferred embodiment, the difference between the contraction length in the width direction of the front waist region and the contraction length in the width direction of the upper abdominal region is smaller than the difference between the contraction length in the width direction of the upper abdominal region and the contraction length in the width direction of the lower abdominal region. The rate of change of the body circumference dimension of the wearer's abdomen is not constant and is different. More specifically, the rate of change of the body circumference dimension on the ventral side of the wearer is such that F12 - F11 < F13 - F12. According to this embodiment, the shape of the absorbent article will more conform to the shape of the body, and displacement of the absorbent article can be suppressed.

[0012] According to a preferred embodiment, the contraction length in the width direction of the upper abdominal region is longer than the contraction length in the width direction of the front leg region. The front leg region is an area where the base of the foot is located and is easy to move following the movement of the foot. According to this embodiment, since the contraction length of the front leg region is relatively short, the length in the width direction of the front leg region in the worn state can be ensured, and the wearing feeling can be improved without hindering the movement of the base of the foot.

[0013] According to a preferred embodiment, the contraction length in the width direction of the lower abdominal region is longer than the contraction length of any region in the front torso surrounding region. According to this embodiment, the contraction length of the lower abdominal region that abuts on the portion (dip) where the torso circumference dimension is short in the abdomen is long, the absorbent article is likely to get caught in the dip, and the displacement of the absorbent article can be suppressed.

[0014] According to a preferred embodiment, the plurality of regions include a rear waist region located 0 to 25% forward with respect to the entire longitudinal length of the rear torso surrounding region from the rear edge of the rear torso surrounding region, an upper back region located 25 to 50% forward with respect to the entire longitudinal length of the rear torso surrounding region from the rear edge of the rear torso surrounding region, a lower back region located 50 to 75% forward with respect to the entire longitudinal length of the rear torso surrounding region from the rear edge of the rear torso surrounding region, and a rear leg region located 75 to 100% forward with respect to the entire longitudinal length of the rear torso surrounding region from the rear edge of the rear torso surrounding region. The contraction length in the width direction of the upper back region is longer than the contraction length in the width direction of the rear waist region. On the back of the wearer, the torso circumference dimension becomes shorter as it moves away from above the bulge of the buttocks. The upper back region corresponds to the portion above the apex of the bulge of the buttocks, and the rear waist region corresponds to the vicinity of the waist (the thinnest part of the torso). The change in the torso circumference dimension gradually decreases from the apex of the bulge of the buttocks upward, and near the waist, there is little bulge outward from the body and it has a flat shape. Since the contraction length of the upper back region is longer than the contraction length of the rear waist region, the absorbent article itself deforms into a shape along the unevenness of the body from the bulge of the buttocks upward on the back, and the displacement of the absorbent article can be suppressed. In addition, since the contraction length of the upper back region is relatively long, the torso circumference dimension of the upper back region becomes short when worn, fits into the depression above the bulge of the buttocks, and the displacement of the absorbent article can be suppressed. Also, the contraction length of the rear waist region that corresponds to the flat-shaped portion near the waist is short, and the torso circumference dimension around the waist when worn can be ensured. Therefore, it is possible to suppress the rear waist region from shifting downward to the crotch side due to contraction.

[0015] According to a preferred embodiment, the shrinkage length in the width direction of the upper back region is longer than the shrinkage length in the width direction of the lower back region. The lower back region is arranged to cover the apex of the hip bulge. The length in the width direction of the lower back region can be ensured, and the wearing feeling can be improved without pressing the hip bulge too much. Further, by shortening the length in the width direction of the upper back region located above the apex of the hip bulge, the absorbent article can be caught in the depression above the apex of the hip bulge, and the displacement and downward movement of the absorbent article can be suppressed. That is, from the hip bulge upward on the back, the absorbent article itself can be deformed into a shape following the unevenness of the body, and the displacement of the absorbent article can be suppressed.

[0016] According to a preferred embodiment, the shrinkage length in the width direction of the rear leg region is shorter than the shrinkage length in the width direction of the lower back region. According to this embodiment, the shrinkage length of the rear leg region is short, and the length in the width direction of the rear body circumference region can be ensured toward the underside of the crotch region. Therefore, shrinkage of the absorbent core can be suppressed, and the liquid absorption performance can be ensured. In addition, by suppressing shrinkage of the absorbent core, generation of unintended wrinkles in the absorbent core can be suppressed, and a decrease in liquid absorption performance due to the unintended wrinkles continuing to the underside of the crotch region can be suppressed. Since the shrinkage length of the rear leg region is relatively short, the length in the width direction of the rear leg region in the worn state can be ensured, and the wearing feeling can be improved without hindering the movement of the base of the foot.

[0017] According to a preferred embodiment, the difference between the shrinkage length of the upper back region and the shrinkage length of the lower back region is larger than the difference between the shrinkage length of the upper back region and the shrinkage length of the rear waist region. From the apex of the hip bulge where the lower back region is arranged to the upper side of the bulge where the upper back region is arranged, the change rate of the body circumference dimension is high, especially the change rate of the body circumference dimension during flexion is high. According to this embodiment, the difference between the shrinkage length of the upper back region and the shrinkage length of the lower back region is large, and it becomes easier to follow the shape of the body.

[0018] According to a preferred embodiment, the contraction length of the rear waist region is longer than the contraction length of the lower back region. The body circumference dimension in the vicinity of the waist to which the rear waist region is applied is shorter than the body circumference dimension of the bulging portion of the buttocks to which the lower back region is applied. According to this embodiment, by deforming the absorbent article itself into a shape that follows the unevenness of the body, the absorbent article does not adhere too closely to the swelling of the body, the absorbent article is caught in the recess, and displacement of the absorbent article can be suppressed.

[0019] According to a preferred embodiment, the contraction length in the width direction of the upper back region is longer than the contraction length of any region of the rear body circumference region. According to this embodiment, by shortening the body circumference dimension of the upper back region applied above the swelling of the buttocks, even if the rear body circumference region is pulled downward, the upper back region is caught above the swelling of the buttocks, and displacement can be suppressed.

[0020] According to a preferred embodiment, the difference between the longest contraction length and the shortest contraction length in the rear body circumference region is larger than the difference between the longest contraction length and the shortest contraction length in the front body circumference region. The back side is more likely to expand and contract during movements such as bending and stretching of the wearer's legs than the front side. If the shape of the absorbent article itself is displaced with respect to the unevenness of the body, the absorbent article is more likely to be displaced during movement. According to this embodiment, by making the absorbent article realize a shape that follows the unevenness of the body, the followability of the absorbent article during movement is improved, and displacement can be suppressed.

[0021] According to a preferred embodiment, the tensile stress in the width direction of the rear waist region is higher than the tensile stress in the upper back region. According to this embodiment, the rear waist region has a higher tensile stress and is more likely to have a higher contact pressure on the body compared to the upper back region. Also, the rear waist region has a shorter contraction length and a smaller contraction amount compared to the upper back region, and it is easier to keep its position with respect to the body. Since the displacement of the rear waist region is small and its contact pressure is high, it is possible to suppress the generation of a gap between the back waist opening and the wearer during the movement of the wearer.

[0022] (2) Overall schematic configuration of the absorbent article Hereinafter, with reference to the drawings, absorbent articles according to the embodiments will be described. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the ratios of the dimensions and the like are different from the actual ones. Therefore, specific dimensions and the like should be determined with reference to the following description. Also, between the drawings, there may be portions where the dimensional relationships and ratios are different from each other. FIG. 1 is a schematic front view of the absorbent article according to the present embodiment. FIG. 2 is a schematic plan view of the absorbent article in a deployed state according to the present embodiment. FIG. 2 shows an extended state in which the absorbent article 1 is extended to a state where no wrinkles are formed after releasing the joining of the side joining portion described later. FIG. 3 is a schematic cross-sectional view of the absorbent article taken along line F3-F3 in FIG. 2. For the sake of convenience of explanation, there are some members whose illustration is omitted. Also, for the sake of convenience of explanation, even if each member is separated in the thickness direction, in the actual product, they may be in contact with each other in the thickness direction.

[0023] The absorbent article 1 is, for example, a pant-type disposable diaper, a tape-type disposable diaper, or a shorts-type sanitary napkin. The absorbent article 1 of the embodiment is a pant-type disposable diaper. As shown in FIG. 1, the absorbent article 1 has a longitudinal direction L and a width direction W orthogonal to the longitudinal direction L. The longitudinal direction L is a direction extending from the front side of the body to the rear side of the body. The absorbent article 1 has a thickness direction T orthogonal to both the longitudinal direction L and the width direction W. The thickness direction T extends to the skin surface side T1 facing the wearer side and the non-skin surface side T2 opposite to the skin surface side.

[0024] The absorbent article 1 has a front torso surrounding area S1 disposed on the ventral side of the wearer, a rear torso surrounding area S2 disposed on the dorsal side of the wearer, and a crotch area S3 disposed on the wearer's thighs and between the front torso surrounding area S1 and the rear torso surrounding area. As shown in FIG. 1, the absorbent article 1 may have a side joining portion 16 that joins the outer portion of the front torso surrounding area S1 and the outer portion of the rear torso surrounding area S2. As shown in FIG. 1, in a state where the side joining portion 16 is formed, the absorbent article 1 has a waist opening 17 through which the wearer's torso passes and a pair of leg openings 18 into which the wearer's legs are respectively inserted. The waist opening 17 may be defined by the front edge S1F of the front torso surrounding area S1 and the rear edge S2R of the rear torso surrounding area S2.

[0025] In the pant-type absorbent article 1, the crotch area S3 may be defined by the inner edge of the side joining portion 16 in the longitudinal direction L. The boundary between the front torso surrounding area S1 and the crotch area S3 may be defined by the rear edge 16R of the side joining portion 16 in the front torso surrounding area S1. The boundary between the rear torso surrounding area S2 and the crotch area S3 may be defined by the front edge 16F of the side joining portion 16 in the rear torso surrounding area S2. Incidentally, the crotch area S3 may be defined by the area where the leg openings 18 are provided. The leg openings 18 are portions that are recessed inward in the width direction W from the outer edge of the absorbent article 1. The boundary between the front torso surrounding area S1 and the crotch area S3 may be defined by the front edge of the leg openings 18. The boundary between the rear torso surrounding area S2 and the crotch area S3 may be defined by the rear edge of the leg openings 18.

[0026] In addition, the outer portion in this specification is a portion that occupies a certain range in the width direction W including the outer edge in the width direction W, and the outer edge is the outer edge in the width direction W. The inner portion in this specification is a portion that occupies a certain range in the width direction W including the inner edge in the width direction W, and the inner edge is the inner edge in the width direction W. Also, the front end portion and the rear end portion in this specification are portions that occupy a certain range in the longitudinal direction L including the edges in the longitudinal direction L, and the front edge and the rear edge are the edges in the longitudinal direction L. The outer end portion includes the front end portion and the rear end portion, and the outer edge includes the front edge and the rear edge.

[0027] The absorbent article 1 may have an absorbent body 20 and an outer cover 50. The absorbent body 20 may be configured as a separate body from the outer cover 50. The absorbent body 20 is disposed at least in the crotch region S3. The absorbent body 20 may extend in the longitudinal direction L from the crotch region S3 to at least the front torso surrounding region S1, or may extend across the front torso surrounding region S1, the rear torso surrounding region S2, and the crotch region S3. The absorbent body 20 overlaps the outer cover 50 in the thickness direction T in the front torso surrounding region S1 and the rear torso surrounding region S2. The outer cover 50 is disposed at least in the front torso surrounding region S1 and the rear torso surrounding region S2. The absorbent body 20 may have an absorber 30, a top sheet 41, a back sheet 42, and side sheets 47. The absorber 30 has at least an absorbent core 31 containing an absorbent material. The absorbent material may contain, for example, pulverized pulp or a superabsorbent polymer (SAP), or a mixture thereof. The absorbent core 31 is disposed at least in the crotch region S3 and may extend from the front torso surrounding region S1 to the rear torso surrounding region S2. The absorber 30 may have a core wrap 32 that covers the absorbent core 31. The core wrap 32 may be composed of, for example, tissue or non-woven fabric.

[0028] The absorber 30 may have a low basis weight portion LR where the basis weight of the absorbent material is lower than that of the surroundings. In the present embodiment, in the low basis weight portion LR, the absorbent core 31 is not disposed in the thickness direction T and the core wrap 32 is disposed. Accordingly, the basis weight of the absorbent material in the low basis weight portion LR is 0. Note that the basis weight of the absorbent material being 0 means that it may be substantially 0, and it is sufficient that the absorbent core 31 is substantially absent in the low basis weight portion LR. The low basis weight portion LR may exist by the inflow of a part of the surrounding absorbent core 31.

[0029] The surface sheet 41 is located on the skin side T1 with respect to the absorber 30. At least a part of the surface sheet 41 (for example, the part not covered by the side sheet 47) is disposed on the skin side T1 most in the absorbent article and abuts against the skin of the wearer. The surface sheet 41 only needs to have liquid permeability and may be formed of, for example, a nonwoven fabric. The back sheet 42 is located on the non-skin side T2 with respect to the absorber 30. The back sheet 42 only needs to have liquid impermeability and may be formed of, for example, a film. The side sheet 47 is disposed outside the center in the width direction W of the absorption core 31 in the width direction W. The side sheet 47 may be disposed on the skin side T1 of the surface sheet. The side sheet 47 may be formed of, for example, a nonwoven fabric.

[0030] The exterior body 50 may be disposed on the non-skin side T2 with respect to the absorbent main body 20. The exterior body 50 may be composed of a plurality of sheet members. The plurality of sheet materials may be formed of, for example, a nonwoven fabric. The exterior body in the front body surrounding area S1 and the exterior body in the back body surrounding area S2 may be separated in the longitudinal direction L. The exterior body 50 may have a waist elastic member 55 disposed in a state of extending in the width direction W in the front body surrounding area S1 and the back body surrounding area S2. The waist elastic member 55 may be composed of a thread-like or string-like elastic member extending in the width direction W, or may be composed of a sheet-like elastic member.

[0031] The absorbent article 1 of the present embodiment is configured to suppress the downward displacement of the absorbent article 1. Next, the configuration for suppressing the downward displacement of the absorbent article 1 will be described in detail. In the front body surrounding region S1 and the rear body surrounding region S2, a plurality of regions obtained by dividing the front body surrounding region S1 and the rear body surrounding region S2 in the longitudinal direction L are provided. Each region is configured to have an appropriate shrinkage length. Due to the difference in the shrinkage length, each region deforms in a different manner, and the absorbent article 1 is configured to be difficult to slip downward. The plurality of regions include a front waist region F11 located 0 to 25% rearward from the front edge S1F of the front body surrounding region S1 with respect to the total length of the front body surrounding region S1 in the longitudinal direction L, an upper abdomen region F12 located 25 to 50% rearward from the front edge S1F of the front body surrounding region S1 with respect to the total length of the front body surrounding region S1 in the longitudinal direction L, a lower abdomen region F13 located 50 to 75% rearward from the front edge S1F of the front body surrounding region S1 with respect to the total length of the front body surrounding region S1 in the longitudinal direction L, a front leg region F14 located 75 to 100% rearward from the front edge S1F of the front body surrounding region S1 with respect to the total length of the front body surrounding region S1 in the longitudinal direction L, a rear waist region R11 located 0 to 25% forward from the rear edge S2R of the rear body surrounding region S2 with respect to the total length of the rear body surrounding region S2 in the longitudinal direction L, an upper back region R12 located 25 to 50% forward from the rear edge S2R of the rear body surrounding region S2 with respect to the total length of the rear body surrounding region S2 in the longitudinal direction L, a lower back region R13 located 50 to 75% forward from the rear edge of the rear body surrounding region S2 with respect to the total length of the rear body surrounding region S2 in the longitudinal direction L, and a rear leg region R14 located 75 to 100% forward from the rear edge of the rear body surrounding region S2 with respect to the total length of the rear body surrounding region S2 in the longitudinal direction L.

[0032] Each region at the contracted length is the region of the entire absorbent article 1 (the region combining the outer wrapper 50 and the absorbent main body 20). The measurement of the contraction length in the width direction W of each region can be obtained by the following method. After leaving the absorbent article 1 in an environment of 23°C ± 2°C and 50% ± 5% humidity for 2 hours, with the absorbent article 1 in a state where wrinkles are no longer visible, marks are made at the boundaries of the regions of the front body surrounding region S1 and the rear body surrounding region S2, and the lengths in the width direction W of each region are measured. In the case of an absorbent article having a side joint, the length in the width direction W of each region is the length between the inner edges of the side joint. When the length in the width direction changes within the region, the average value of the length of the longest part and the length of the shortest part is used. Next, for the absorbent article 1 having the side joint 16, the side joint 16 is torn to separate the front body surrounding region S1 and the rear body surrounding region S2. When the absorbent main body 20 is joined to the front body surrounding region S1 and the rear body surrounding region S2, without releasing the joint, it is cut for each region to obtain test pieces. The test pieces are placed on a table and left for 60 minutes to make the test pieces in a natural state. Then, a 5 mm acrylic plate is placed on the test pieces, and the test pieces are sandwiched between the table and the acrylic plate, and the length in the width direction of the test pieces is measured. When the test pieces are curved, a soft measurer is curved for measurement. In addition, when the absorber is arranged in the region, due to the thickness of the absorber, it is difficult to sandwich the test pieces between the table and the acrylic plate. Therefore, when the absorber is 3 mm or more, the absorber is removed for measurement. The contraction length can be calculated by the following (Formula 1). (Formula 1) Contraction length = Length in the extended state - Length in the natural state (unit: mm) Table 1 shows the measurement data of the contraction lengths obtained for the absorbent article 1 according to Example 1 and Example 2.

Table 1

[0033] FIG. 4 is a diagram schematically showing a state where the absorbent article 1 is worn by the wearer. FIG. 4 is a diagram showing the wearing state on the side in the standing state. The line of the wearer's body is indicated by a dashed line BL. As shown in FIG. 4, the body shape of the wearer is different between the ventral side and the dorsal side, and the body circumference dimension changes in the longitudinal direction L of the absorbent article 1. As a result of the applicant's intensive research, the body circumference dimension of the wearer's abdomen is short in the vicinity of the depression at the lower end of the abdomen, and gradually increases from the depression at the lower end toward the thigh side. In the absorbent article 1, the region having a long shrinkage length contracts by a long length and has a large change due to contraction in the process of changing from the stretched state to the natural state (the state where the wearing assistant or the like removes the tensile force in the width direction). Therefore, in the absorbent article 1, the region having a long shrinkage length has a shorter dimension along the body circumference in the wearing state and is likely to fit the concave portion of the body. In the absorbent article 1 of the present embodiment, the shrinkage length in the width direction W of the lower abdomen region F13 is longer than the shrinkage length in the width direction W of the front leg region F14. That is, the relationship of the shrinkage lengths satisfies F13 > F14. Since the shrinkage length of the lower abdomen region F13 that contacts the portion where the body circumference dimension is short (the depression) in the abdomen is long, and the shrinkage length of the front leg region F14 that contacts the portion that bulges more than the depression is relatively short, the absorbent article 1 itself deforms into a shape along the unevenness of the body. By arranging the portion having a short dimension of the absorbent article 1 in the depression of the body, the absorbent article 1 is caught in the depression, and displacement of the absorbent article 1 can be suppressed.

[0034] The contraction length in the width direction W of the lower abdominal region F13 may be longer than the contraction length in the width direction W of the upper abdominal region F12. That is, the relationship of the contraction lengths may satisfy F13 > F12. The body circumference dimension of the wearer's abdomen is short near the indentation at the lower end of the abdomen, and gradually becomes longer upward from the indentation at the lower end. Since the contraction length of the lower abdominal region F13 is long and the contraction lengths of the upper abdominal region F12 and the front leg region F14 that abut against the bulging portion from the indentation are relatively short, the absorbent article 1 itself deforms into a shape that follows the unevenness of the body. By arranging the short portion of the dimension of the absorbent article 1 in the indentation of the body, the absorbent article 1 is caught in the indentation, and displacement of the absorbent article 1 can be suppressed. Further, if the contraction length of the upper abdominal region F12 is longer than the contraction length of the lower abdominal region F13, there may be a problem that the bulging portion by the upper abdominal region F12 is compressed or the upper abdominal region F12 is displaced to the concave side of the abdomen. However, this problem can be suppressed by the absorbent article 1 following the shape of the body.

[0035] The contraction length in the width direction W of the upper abdominal region F12 may be longer than the contraction length in the width direction W of the front waist region F11. That is, the relationship of the contraction lengths may satisfy F12 > F11. The body circumference dimension of the wearer's abdomen is short near the indentation at the lower end of the abdomen, and gradually becomes longer upward from the indentation at the lower end. The body circumference dimension of the absorbent article 1 in the natural state becomes longer in the order of the lower abdominal region F13, the upper abdominal region F12, and the front waist region F11. By deforming the absorbent article 1 itself into a shape that follows the bulge of the abdomen, displacement can be suppressed. Further, the vicinity of the navel where the front waist region F11 is arranged is a portion that is likely to move when the legs are bent and extended. By shortening the contraction length of the region covering the easily movable portion, the absorbent article 1 adheres to the body and the movement of the absorbent article 1 due to the absorbent article 1 following the movement of the body too much can be suppressed, and the wrinkling of the absorbent article 1 can be suppressed.

[0036] The difference between the contraction length in the width direction W of the front waist region F11 and the contraction length in the width direction W of the upper abdomen region F12 may be smaller than the difference between the contraction length in the width direction W of the upper abdomen region F12 and the contraction length in the width direction W of the lower abdomen region F13. That is, the relationship of the contraction lengths may satisfy F12 - F11 < F13 - F12. The rate of change of the body circumference dimension of the wearer's abdomen is not constant and is different. More specifically, the rate of change of the body circumference dimension on the ventral side of the wearer's abdomen is F12 - F11 < F13 - F12. According to this aspect, the shape of the absorbent article will more conform to the shape of the body, and the displacement of the absorbent article can be suppressed.

[0037] The contraction length in the width direction W of the upper abdomen region F12 may be longer than the contraction length in the width direction W of the front leg region F14. That is, the relationship of the contraction lengths may satisfy F12 > F14. The front leg region F14 is a region where the base of the foot is arranged and is easy to move following the movement of the foot. By making the contraction length of the front leg region F14 relatively short, the length in the width direction of the front leg region F14 in the worn state can be ensured, and the wearing feeling can be improved without inhibiting the movement of the base of the foot. Preferably, the contraction length in the width direction W of the front leg region F14 may be shorter than the contraction length of any region in the front body circumference region S1. That is, the relationship of the contraction lengths may satisfy F14 < F11, F14 < F12, F14 < F13. Since the contraction length in the width direction W of the front leg region F14 is short, the movement of the foot is not inhibited, and the wearing feeling can be further improved.

[0038] The contraction length in the width direction W of the lower abdomen region F13 may be longer than the contraction length of any region in the front body circumference region S1. That is, the relationship of the contraction lengths may satisfy F13 > F11, F13 > F12, F13 > F14. The body circumference dimension of the wearer's abdomen is the shortest near the depression at the lower end of the abdomen. The contraction length of the lower abdomen region F13 that abuts on the part (depression) where the body circumference dimension is short in the abdomen is long, and the absorbent article is likely to be caught by the depression, and the displacement can be suppressed.

[0039] In the back of the wearer, as the distance from the bulge of the buttocks increases upward, the waist circumference dimension becomes shorter. The apex of the bulge of the buttocks is covered by the lower back region R13. The portion covered by the upper back region R12 and the rear waist region R11 is more concave than the portion covered by the lower back region R13. The contraction length in the width direction W of the upper back region R12 may be longer than the contraction length in the width direction of the lower back region R13. That is, the relationship of the contraction lengths may satisfy R12 > R13. The lower back region R13 is arranged to cover the apex of the bulge of the buttocks. The length in the width direction W of the lower back region R13 can be ensured, and the wearing feeling can be improved without pressing too hard on the bulge of the buttocks. Also, by shortening the length in the natural width direction W of the upper back region R12 located above the apex of the bulge of the buttocks, the absorbent article 1 can be caught on the portion above the apex of the bulge of the buttocks, and the displacement and sagging of the absorbent article 1 can be suppressed. That is, from the bulge of the buttocks upward on the back, the absorbent article 1 itself deforms into a shape following the unevenness of the body, and the displacement of the absorbent article 1 can be suppressed. Further, the vicinity of the apex of the buttocks where the lower back region R13 is arranged is a portion that moves easily, such as when bending and stretching the legs. By shortening the contraction length of the region covering the easily movable portion, the movement of the absorbent article due to the absorbent article following the movement of the body too much can be suppressed, and the bunching of the absorbent article can be suppressed. In addition, the lower back region R13 is arranged to face the discharged feces. If the contraction length of the lower back region R13 is long, the feces may adhere to the body and the wearing feeling may deteriorate. However, the lower back region R13 has a relatively short contraction length and does not adhere to the body. Therefore, the discharged feces can be continuously accommodated without adhering to the body, and the deterioration of the wearing feeling can be suppressed.

[0040] The shrinkage length in the width direction of the upper back region R12 may be longer than the shrinkage length in the width direction of the rear waist region R11. That is, the relationship of the shrinkage lengths may satisfy R12 > R11. In the back of the wearer, as the distance from the bulge of the buttocks increases upward, the body circumference dimension becomes shorter. The upper back region R12 corresponds to the portion above the apex of the bulge of the buttocks, and the rear waist region R11 corresponds to the vicinity of the waist (the thinnest part of the body). The change in the body circumference dimension gradually decreases upward from the apex of the bulge of the buttocks, and in the vicinity of the waist, there is little outward bulge of the body and it has a flat shape. Since the shrinkage length of the upper back region R12 is longer than the shrinkage length of the rear waist region R11, the absorbent article 1 itself deforms into a shape following the unevenness of the body upward from the bulge of the buttocks on the back, and the displacement of the absorbent article 1 can be suppressed. In addition, since the shrinkage length of the upper back region R12 is relatively long, the body circumference dimension of the upper back region becomes shorter during wearing, fits into the depression above the bulge of the buttocks, and the displacement of the absorbent article can be suppressed. Also, the shrinkage length of the rear waist region corresponding to the flat-shaped portion near the waist is short, and the body circumference dimension around the waist during wearing can be ensured. Therefore, it is possible to suppress the rear waist region from shifting downward to the crotch side due to shrinkage.

[0041] The contraction length in the width direction of the hind leg region R14 may be shorter than the contraction length in the width direction of the lower back region R13. That is, the relationship of the contraction lengths may satisfy R14 < R13. Since the contraction length of the hind leg region R14 is short, the length in the width direction of the rear body surrounding region S2 can be ensured toward the crotch region S3 side. Therefore, shrinkage of the absorption core 31 can be suppressed, and the liquid absorption performance can be ensured. In addition, by suppressing shrinkage of the absorption core 31, generation of unintended wrinkles in the absorption core 31 can be suppressed, and it can be suppressed that the liquid absorption performance deteriorates due to the unintended wrinkles continuing toward the crotch region S3 side. Furthermore, the hind leg region R14 is a region where the base of the foot is arranged and it is easy to move following the movement of the foot. By shortening the contraction length of the hind leg region R14, the wearing feeling can be improved without inhibiting the movement of the base of the foot. Preferably, the contraction length in the width direction W of the hind leg region R14 may be shorter than the contraction length of any region of the rear body surrounding region S2. That is, the relationship of the contraction lengths may satisfy R14 < R11, R14 < R12, and R14 < R13. The hind leg region R14 is a region where the base of the foot is arranged and it is easy to move following the movement of the foot. By shortening the contraction length of the hind leg region R14, the wearing feeling can be improved without inhibiting the movement of the base of the foot.

[0042] The difference between the contraction length of the upper back region R12 and the contraction length of the lower back region R13 may be larger than the difference between the contraction length of the upper back region R12 and the contraction length of the rear waist region R11. That is, the relationship of the contraction lengths may satisfy R12 - R13 > R12 - R11. The body circumference dimension of the wearer's back changes in the degree of swelling upward from the apex of the swelling of the buttocks. From the apex of the swelling of the buttocks where the lower back region R13 is arranged toward the upper side of the swelling where the upper back region R12 is arranged, the change rate of the body circumference dimension is high, and particularly the change rate of the body circumference dimension at the time of bending is high. When the difference between the contraction length of the upper back region R12 and the contraction length of the lower back region R13 is large, the absorbent article can more easily follow the shape of the body.

[0043] The contraction length of the rear waist region R11 may be longer than the contraction length of the lower back region R13. That is, the relationship of the contraction lengths may satisfy R11 > R13. The body circumference dimension in the vicinity of the waist to which the rear waist region R11 is applied is shorter than the body circumference dimension of the bulging portion of the buttocks to which the lower back region R13 is applied. When the absorbent article 1 itself deforms into a shape along the unevenness of the body in the worn state, the absorbent article 1 does not adhere too closely to the bulge of the body, and the absorbent article 1 is caught in the dent, so that the displacement of the absorbent article 1 can be suppressed.

[0044] The contraction length in the width direction of the upper back region R12 may be longer than the contraction length of any region in the rear body circumference region S2. That is, the relationship of the contraction lengths may satisfy R12 > R11, R12 > R13, and R12 > R14. By shortening the body circumference dimension of the upper back region R12 applied above the bulge of the buttocks, even if the rear body circumference region S2 is pulled toward the crotch region S3 side, the upper back region R12 is caught above the bulge of the buttocks, and the downward displacement can be suppressed.

[0045] The difference between the longest contraction length and the shortest contraction length in the rear body circumference region S2 may be larger than the difference between the longest contraction length and the shortest contraction length in the front body circumference region S1. In the present embodiment, the difference between the contraction length of the upper back region R12 having the longest contraction length in the rear body circumference region S2 and the rear leg region R14 having the shortest contraction length in the rear body circumference region S2 is larger than the difference between the contraction length of the lower abdomen region F13 having the longest contraction length in the front body circumference region S1 and the front leg region F14 having the shortest contraction length in the front body circumference region S1. The back side is more likely to expand and contract during movements such as bending and stretching of the wearer's legs than the front side. If the shape of the absorbent article 1 itself is displaced with respect to the unevenness of the body, the absorbent article 1 is more likely to be displaced during movement. However, by the absorbent article 1 realizing a shape along the unevenness of the body, the followability of the absorbent article 1 during movement is increased, and the displacement can be suppressed.

[0046] Further, each region of the absorbent article 1 is configured to have an appropriate tensile stress. Due to differences in tensile stress, each region deforms in a different manner, and the absorbent article 1 is configured to be difficult to shift downward. Each region in the tensile stress is a region of the outer wrapper 50 (a region not including the absorbent body 20). The definition of each region and the measurement of the tensile stress can be obtained by the following method. The absorbent article 1 having the side joint 16 is torn at the side joint 16 to separate the front body circumferential region S1 and the rear body circumferential region S2. Next, the absorbent body 20 is separated from the outer wrapper 50. After leaving the outer wrapper 50 in an environment of a temperature of 23°C ± 2°C and a humidity of 50% ± 5% for 2 hours, with the outer wrapper 50 in a state of being stretched until wrinkles disappear, marks are made at the boundaries of the regions of the front body circumferential region S1 and the rear body circumferential region S2. Based on the marks, the outer wrapper 50 is cut to obtain test pieces divided into a plurality of regions. Next, both ends (5 mm wide) of the cut test piece are clamped by a chuck (a clamping tool) of a tensile tester (Instron). At this time, the distance between the chucks is set to 100 mm. Next, while fixing one of the chucks in the width direction W, the other chuck is moved so as to change the distance between the chucks. The moving speed of the chuck at this time is set to 254 mm / min. During the movement of the chuck, the stress applied to the chuck is measured, and the stress (N) obtained in a state of 70% (a constant width) from the stretched state is defined as the "tensile stress". Table 2 shows the measurement data of the tensile stress obtained for the absorbent article 1 according to the above Example 2. Note that in Table 2, only the measurement results according to Example 2 are shown, but the relationship of the tensile stress in the following description is the same for the absorbent article according to Example 1.

Table 2

[0047] As described above, the body shape of the wearer is different between the ventral side and the dorsal side, and the body circumference dimension changes in the longitudinal direction L of the absorbent article 1. As a result of the applicant's intensive research, in the abdomen of the wearer, the body circumference dimension is the shortest near the depression at the lower end of the abdomen, and the body circumference dimension becomes longer toward the upper side and the crotch side from the depression at the lower end of the abdomen. Further, in the back of the wearer, the body circumference dimension becomes shorter as it moves away from above the swelling of the buttocks, and in the vicinity of the waist (the thinnest part of the body), the change in the body circumference dimension is small, and it is almost flat with little swelling outward of the body. The region where the stress is large in the absorbent article 1 adheres to the body. At this time, for example, when the region where the stress is large adheres to a portion where the body circumference dimension is relatively long, the absorbent article 1 may shift because the region where the stress is large moves to a portion where the body circumference dimension is short due to the contraction of the absorbent article 1. However, in the present embodiment, the tensile stress in the width direction W of the lower abdomen region F13 is larger than the tensile stress in any region of the front body circumference region S1. That is, the relationship of the tensile stress satisfies F13 > F11, F13 > F12, F13 > F14. Further, the tensile stress in the width direction W of the rear waist region R11 is larger than the tensile stress in any region of the rear body circumference region S2. That is, the relationship of the tensile stress satisfies R11 > R12, R11 > R13, R11 > R14. The tensile stress of the lower abdomen region F13 that contacts the portion where the body circumference dimension is the shortest in the abdomen is the largest, and the tensile stress of the rear waist region R11 that contacts the portion where the body circumference dimension is the shortest in the back is the largest, and the region where the stress is the largest hits the portion where the body circumference dimension is short. By applying the region with the largest stress to the most concave portion of the body, the absorbent article 1 can be fitted to the body shape by the contraction of the absorbent article 1, and the absorbent article 1 can be prevented from shifting in the longitudinal direction L. That is, by arranging the region where the stress is large in the body recess, the body shape and the stress of the absorbent article 1 match, and the shift of the absorbent article 1 can be suppressed. In addition, since the rear waist region R11 where the stress is relatively large fits near the waist on the dorsal side where the body is flat, it is difficult for a shift in the longitudinal direction L to occur during fitting, and it is easy to continuously maintain the appropriate position of the absorbent article 1.

[0048] The tensile stress in the width direction W of the upper back region R12 may be greater than the tensile stress in the width direction W of the lower back region R13. That is, the relationship of the tensile stress may satisfy R12 > R13. The tensile stress in the rear body circumference region S2 gradually increases in the order of the lower back region R13, the upper back region R12, and the rear waist region R11. The lower back region R13 is a portion that covers the bulge of the wearer's buttocks. The back body circumference dimension gradually becomes shorter toward the upper side from the bulge of the buttocks. As the body circumference dimension of the body decreases, by increasing the stress of the absorbent article 1, the absorbent article 1 can be made to follow the body shape of the wearer, and the deviation in the longitudinal direction L of the absorbent article 1 can be suppressed. In addition, the lower back region R13 is disposed to face the discharged feces. If the tensile stress in the lower back region R13 is large, the feces may adhere to the body, and the wearing feeling may deteriorate. However, the lower back region R13 has a smaller stress compared to the rear waist region R11 and the upper back region R12 and does not adhere to the body. Therefore, the discharged feces can be continuously accommodated without adhering to the body, and the deterioration of the wearing feeling can be suppressed. Further, the bulging portion of the buttocks covered by the lower back region R13 is a portion where the body easily moves during operation. Since the absorbent article 1 does not adhere too tightly to the portion where the body easily moves during the operation, the absorbent article 1 is less likely to shrink due to the movement of the body, and the deviation can be suppressed.

[0049] The tensile stress in the width direction W of the lower back region R13 may be greater than the tensile stress in the width direction W of the hind leg region R14. That is, the relationship of the tensile stress satisfies R13 > R14, and may satisfy R11 > R12 > R13 > R14. The tensile stress in the rear body circumference region S2 gradually increases in the order of the hind leg region R14, the lower back region R13, the upper back region R12, and the rear waist region R11. The back body circumference dimension becomes shorter toward the lower thigh side from the bulge of the buttocks. Therefore, the body circumference dimension of the portion where the hind leg region R14 is disposed is shorter than the body circumference dimension of the portion where the lower back region R13 is disposed. However, the hind leg region R14 is a region where the base of the foot is disposed and is easy to move following the movement of the foot. By making the tensile stress in the hind leg region R14 relatively small, the wearing feeling can be improved without hindering the movement of the base of the foot.

[0050] The tensile stress in the width direction W of the front waist region F11 may be smaller than the tensile stress in the width direction W of the upper abdomen region F12. That is, the relationship of the tensile stress may satisfy F11 < F12. The girth dimension of the wearer's abdomen is shortest at the indentation at the lower end of the abdomen and becomes longer as it moves away from the indentation upward. The tensile stress of the front girth region S1 gradually increases in the order of the lower abdomen region F13, the upper abdomen region F12, and the front waist region F11. By increasing the stress of the absorbent article 1 as the girth dimension of the body decreases, the absorbent article 1 can be made to conform to the body shape of the wearer, and the displacement in the longitudinal direction L of the absorbent article 1 can be suppressed. Further, the bulging portion of the abdomen covered by the front waist region F11 is a portion where the body can move easily during operation. By preventing the absorbent article 1 from adhering too tightly to the portion where the body can move easily during the operation, the absorbent article 1 is less likely to wrinkle due to the movement of the body, and the displacement can be suppressed.

[0051] The tensile stress in the width direction W of the lower abdomen region F13 may be equal to or less than the sum of the tensile stress in the width direction W of the front waist region F11, the tensile stress in the width direction W of the upper abdomen region F12, and the tensile stress in the width direction W of the front leg region F14. That is, the relationship of the tensile stress may satisfy F13 < F11 + F12 + F14, or F13 = F11 + F12 + F14. If the tensile stress of the lower abdomen region F13 is too large compared to the surroundings, while the downward displacement of the absorbent article 1 can be suppressed, there is a risk that the wearing feeling deteriorates due to local constriction. Since the tensile stress of the lower abdomen region F13 is equal to or less than the sum of the tensile stresses of the other regions of the front girth region S1, the lower abdomen region F13 does not protrude too much with respect to the overall wearing pressure of the front girth region S1, and the downward displacement can be suppressed while suppressing discomfort.

[0052] The relationship of the tensile stress in the region of the front girth region S1 may satisfy F13 > F12 > F11 > F14. The relationship of the tensile stress can be arranged according to the girth of the abdomen, and the absorbent article 1 can be fitted to the lower abdomen region F13 with a relatively short girth, and the stress is reduced in the front leg region F14 where the trace of the elastic member around the leg is likely to remain, so that the wearing feeling of the wearer can be improved without tightening the vicinity of the thigh.

[0053] The tensile stress in the width direction W of the rear waist region R11 is greater than that of any other region. That is, the relationship of the tensile stress satisfies R11>F11, R11>F12, R11>F13, R11>F14. By applying the greatest stress to the deepest concave part of the body on the back, it is possible to suppress the displacement of the absorbent article 1 in the longitudinal direction L due to the shrinkage of the absorbent article 1. Further, since the tensile stress in the width direction W of the rear waist region R11 is greater than that of any other region, it is possible to suppress the displacement by increasing the pressure on the back while suppressing the pressure on the abdomen. It is possible to suppress the sense of compression on the abdomen of the wearer and improve the wearing feeling.

[0054] The total value of the tensile stresses in the width direction W of the four regions of the rear body circumference region S2 may be greater than the total value of the tensile stresses in the width direction W of the four regions of the front body circumference region S1. That is, the relationship of the tensile stress satisfies R11+R12+R13+R14>F11+F12+F13+F14. The body shape of the wearer is different between the abdomen and the back, and the ventral side bulges more than the dorsal side. The total value of the tensile stresses of the plurality of regions in the front body circumference region S1 is relatively small, so that it does not squeeze too much against the ventral side with a large bulge of the body, and the total value of the tensile stresses of the plurality of regions in the rear body circumference region S2 is relatively large, so that the absorbent article 1 fits against the dorsal side with a small bulge of the body, and both the improvement of the wearing feeling and the suppression of displacement can be achieved.

[0055] The total value of the tensile stress in the width direction W of the front waist region F11 and the tensile stress in the width direction W of the rear waist region R11 may be greater than the total value of the tensile stress in the width direction W of the lower abdomen region F13 and the tensile stress in the width direction W of the lower back region R13. That is, the relationship of the tensile stress may satisfy F11+R11>F13+R13. In the worn state, the front body circumference region S1 and the rear body circumference region S2 are continuous, and both cooperate to cover the body circumference of the wearer. The dimension around the body circumference of the wearer tends to be shorter near the waist opening than near the lower abdomen. By increasing the total value of the tensile stress near the waist opening, it is possible to design the stress according to the circumference obtained by adding the front and back of the body, and suppress the displacement of the absorbent article 1.

[0056] The total value of the tensile stress in the width direction W of the front waist region F11 and the tensile stress in the width direction W of the rear waist region R11, and the total value of the tensile stress in the width direction W of the lower abdomen region F13 and the tensile stress in the width direction of the lower back region R13 may be greater than the total value of the tensile stress in the width direction W of the upper abdomen region F12 and the tensile stress in the width direction W of the upper back region R12. That is, the relationship of the tensile stress may satisfy F11 + R11 > F12 + R12 and F13 + R13 > F12 + R12. The circumference of the torso is the shortest near the waist opening and becomes longer toward the crotch side from the waist opening. The reason for the increase is due to the abdominal bulge and the slope from the apex of the buttocks. The abdominal bulge and the slope from the apex of the buttocks mainly correspond to the upper abdomen region F12 and the upper back region R12. Since the combined value of the tensile stresses in the upper abdomen region F12 and the upper back region R12 is smaller than the combined value of the tensile stresses in the front waist region F11 and the rear waist region R11, the absorbent article 1 is arranged along the body without constricting the body bulge. The circumference of the torso becomes shorter due to the concave of the lower abdomen toward the crotch side than the abdominal bulge and the slope from the apex of the buttocks. The combined value of the tensile stress in the lower abdomen region F13 and the tensile stress in the lower back region R13 is greater than the combined value of the tensile stresses in the upper abdomen region F12 and the upper back region R12 and fits the concave of the lower abdomen. The region from near the waist opening to the lower end of the abdomen is arranged according to the circumference of the body, suppressing the deterioration of the wearing feeling due to local constriction and suppressing the displacement of the entire absorbent article 1.

[0057] The total value of the tensile stress in the width direction W of the rear waist region R11 and the tensile stress in the width direction W of the upper back region R12 may be greater than the total value of the tensile stress in the width direction W of the lower abdomen region F13 and the tensile stress in the width direction W of the hind leg region R14. That is, the relationship of the tensile stress may satisfy R11 + R12 > R13 + R14. The shape of the body in the back is concave on the upper side, and the rear waist region R11 and the upper back region R12 are regions that are relatively concave in the back. By fitting the concave portion of the back with a strong stress, displacement of the absorbent article 1 is suppressed. Also, the total value of the tensile stress in the width direction W of the rear waist region R11 and the tensile stress in the width direction W of the upper back region R12 may be greater than the total value of the tensile stress in the width direction W of the lower abdomen region F13 and the tensile stress in the width direction W of the hind leg region R14. That is, the relationship of the tensile stress may satisfy F11 + F12 > F13 + F14. The shape of the body in the abdomen is concave on the lower side, and the lower abdomen region F13 and the front leg region F14 are regions that are relatively concave in the abdomen. By fitting the concave portion of the abdomen with a strong stress, displacement of the absorbent article 1 is suppressed. It may be greater than the average value of the tensile stress in the width direction W of the lower abdomen region F13 and the tensile stress in the width direction W of the front leg region F14. The relationship of the tensile stress may satisfy R11 + R12 > F13 + F14. The rear waist region R11 and the upper back region R12 are regions that are relatively concave in the back. Also, the lower abdomen region F13 and the front leg region F14 are regions that are relatively concave in the abdomen. By strongly tightening the concave regions in the abdomen and the back, displacement and sagging can be suppressed. Also, by tightening the back side more strongly than the abdominal side, the pulling force toward the upper side of the back side is increased, and a force opposite to the direction in which the abdominal side sags downward is applied. Therefore, displacement and sagging of the absorbent article 1 can be suppressed.

[0058] The tensile stress in the width direction W of R11 in the rear waist region may be greater than the tensile stress in the width direction W of the lower abdomen region F13. That is, the relationship of the tensile stress may satisfy R11 > F13. In the front body circumference region S1, the tensile stress in the lower abdomen region is the largest, and in the rear body circumference region S2, the tensile stress in the rear waist region is the largest. In the worn state, the lower abdomen region and the rear waist region pull against each other. At this time, since the tensile stress in the rear waist region is greater than the tensile stress in the lower abdomen region, a force in the obliquely upward direction acts from the center of the abdomen toward the side of the body. Therefore, even when a force acts on the thigh region side during the absorption of body fluids such as urine, the downward movement of the absorbent article 1 can be suppressed.

[0059] The tensile stress in the width direction W of R12 in the upper back region may be greater than the tensile stress in the width direction W of the lower abdomen region F13. That is, the relationship of the tensile stress may satisfy R12 > F13. In the worn state, the lower abdomen region F13 and the upper back region R12 pull against each other. At this time, since the tensile stress in the upper back region R12 is greater than the tensile stress in the lower abdomen region, a force in the obliquely upward direction acts from the center of the abdomen toward the side of the body. Therefore, even when a force acts on the thigh region side during the absorption of body fluids such as urine, the downward movement of the absorbent article 1 can be suppressed.

[0060] The tensile stress in the width direction W of the lower abdomen region F13 may be greater than the tensile stress in the width direction W of the lower back region R13. That is, the relationship of the tensile stress may satisfy F13 > R13. The lower abdomen region F13 and the lower back region R13 pull against each other via the side joint portion 16. At this time, since the relationship of the tensile stress satisfies F13 > R13, the lower abdomen region with a relatively large tensile stress pulls the back side toward the front side, and the fitness with respect to the lower end of the abdomen can be further improved. Also, in the back, since the tensile stress in the rear waist region R11 is relatively large, an upward force is generated, and the displacement and downward movement of the absorbent article 1 can be suppressed.

[0061] The tensile stress in the width direction W of the upper back region R12 may be greater than the tensile stress in the width direction W of the upper abdominal region F12. That is, the relationship of the tensile stress may satisfy R12 > F12. Further preferably, the tensile stress in the width direction W of the upper back region R12 may be twice or more the tensile stress in the width direction W of the upper abdominal region F12. The shape of the body is concave above the apex of the buttocks where the upper back region R12 hits, and the portion above the lower end of the abdomen where the upper abdominal region F12 is arranged bulges. The difference in the body circumference between the region where the concavity starts with respect to the apex of the buttocks and the region where the bulge starts with respect to the lower end of the abdomen tends to be large. By satisfying the relationship of the tensile stress R12 > F12, the stress distribution can be made more suitable for the body shape, and the slippage of the absorbent article 1 can be suppressed.

[0062] The total value of the tensile stress in the width direction W of the rear waist region R11 and the tensile stress in the width direction W of the upper back region R12 may be equal to or greater than the total value of the tensile stress in the width direction W of the front waist region F11 and the tensile stress in the width direction W of the upper abdominal region F12. According to this aspect, by tightening the back side more strongly than the abdominal side with respect to the vicinity that is recessed due to the body shape, a force opposite to the direction in which the abdominal side slips downward can be applied, so that the slippage of the absorbent article 1 can be suppressed.

[0063] In addition to the difference in stress of the outer body, the configuration of the absorbent body may be changed. More specifically, the low basis weight portion LR may be arranged in a region overlapping the lower abdominal region F13. The low basis weight portion LR makes the absorbent core 31 more easily deformed, the lower abdominal region F13 fits better into the recess at the lower end of the abdomen, and the displacement of the front body circumference region S1 can be more suppressed.

[0064] As described above, the absorbent article of the present embodiment is designed to have a tensile stress and a shrinkage length suitable for each stress. The region with a high tensile stress adheres to the wearer. As a result, the region fits the body and the contact pressure becomes high. On the other hand, the region with a low tensile stress does not adhere too closely to the body. Therefore, an appropriate space between the body and the absorbent article is ensured, a storage space for excrement is ensured, a deterioration in the wearing feeling due to constriction is suppressed, and a displacement of the absorbent article caused by excessive following of the body movement can be suppressed. Further, in the region where the shrinkage length is short, the length in the width direction W is less likely to become short during wearing, and it is easy to be arranged along the swelling of the body. Furthermore, in the region where the shrinkage length is short, the difference between the length in the extended state and the length in the natural state is small. Since the length that can be shrunk in the region is small, it is difficult to be displaced. On the other hand, in the region where the shrinkage length is long, the length in the width direction W becomes short during wearing, and it is easy to be arranged along the depression of the body.

[0065] In addition, the configuration for increasing the stress in each region can be realized, for example, as follows. Increase the elongation ratio of the waist elastic member disposed on the exterior body. Or increase the number of filamentous or cord-like waist elastic members 55. Or increase the count of the filamentous waist elastic member disposed on the exterior body. Also, for the configuration for decreasing the stress in each region, the opposite configuration of the configuration for increasing it may be adopted. Further, the configuration for increasing the contraction length of each region can be realized, for example, as follows. Increase the elongation ratio of the waist elastic member disposed on the exterior body. Or increase the number of filamentous or cord-like waist elastic members 55. Or increase the count of the filamentous waist elastic member disposed on the exterior body. Note that the count of the elastic member has a relatively large influence on the tensile stress and a relatively small influence on the contraction length. Decrease the material (basis weight or number of sheets of the sheet) on which the waist elastic member is disposed. Or decrease the adhesive for adhering the waist elastic member to the material. Or do not dispose the absorption core. Or decrease the basis weight of the absorption material of the absorption core. By decreasing the material and the adhesive, or not disposing the absorption core, or decreasing the basis weight of the absorption material, the rigidity becomes lower and it becomes easier to contract. Also, for the configuration for decreasing the contraction length of each region, the opposite configuration of the configuration for increasing it may be adopted. As described above, the contraction length is the natural length with respect to the elongation state of each region in the entire absorbent article 1, and the tensile stress is the tensile stress of each region in the exterior body 50. The contraction length and the tensile stress have different definitions and different magnitude relationships. More specifically, when the contraction length of an arbitrary first region is longer than the contraction length of an arbitrary second region (the first region contracts more), the tensile stress of the first region is not necessarily larger than the tensile stress of the second region, and the tensile stress of the first region may be smaller than the tensile stress of the second region.

[0066] The tensile stress in the width direction of the rear waist region R11 may be higher than the tensile stress in the upper back region R12, and the shrinkage length in the width direction of the upper back region R12 may be longer than the shrinkage length in the width direction of the rear waist region R11. That is, the relationship of the tensile stress may satisfy R11 > R12, and the relationship of the shrinkage length may satisfy R12 > R11. Compared with the upper back region, the rear waist region has a higher tensile stress and is likely to have a higher pressure on the body. Also, according to a preferred form, the rear waist region R11 has a shorter shrinkage length, a smaller shrinkage amount, and is easier to keep its position relative to the body compared with the upper back region R12. Since the displacement of the rear waist region R11 is small and its pressure is high, it is possible to suppress the generation of a gap between the back waist opening and the wearer during the movement of the wearer.

[0067] As described above, the present invention has been described in detail using the above embodiments. However, it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in this specification. The present invention can be implemented as modifications and variations without departing from the spirit and scope of the present invention as defined by the claims. Therefore, the description in this specification is for the purpose of illustration and has no restrictive meaning for the present invention.

Industrial Applicability

[0068] It is possible to provide an absorbent article that can suppress the slippage of the absorbent article.

Explanation of Signs

[0069] 1: Absorbent article, 31: Absorbent core, LR: Low basis weight part, F11: Front waist region, F12: Upper abdomen region, F13: Lower abdomen region, F14: Front leg region, R11: Rear waist region, R12: Upper back region, R13: Lower back region, R14: Rear leg region, S1: Front body circumference region, S1F: Front edge, S2: Rear body circumference region, S2R: Rear edge, S3: Inseam region, L: Longitudinal direction, W: Width direction

Claims

1. A longitudinal direction and a width direction that are orthogonal to each other, a front torso region, a rear torso region, and a crotch region disposed between the front torso region and the rear torso region, and an absorbent core disposed at least in the crotch region, an absorbent article comprising: in the front torso region and the rear torso region, a plurality of regions are provided that divide the front torso region and the rear torso region in the longitudinal direction, the plurality of regions including a front waist region located 0 to 25% rearward of the front edge of the front torso region with respect to the entire longitudinal length of the front torso region, an upper abdomen region located 25 to 50% rearward of the front edge of the front torso region with respect to the entire longitudinal length of the front torso region, a lower abdomen region located 50 to 75% rearward of the front edge of the front torso region with respect to the entire longitudinal length of the front torso region, a front leg region located 75 to 100% rearward of the front edge of the front torso region with respect to the entire longitudinal length of the front torso region, a rear waist region located 0 to 25% forward of the rear edge of the rear torso region with respect to the entire longitudinal length of the rear torso region, an upper back region located 25 to 50% forward of the rear edge of the rear torso region with respect to the entire longitudinal length of the rear torso region, a lower back region located 50 to 75% forward of the rear edge of the rear torso region with respect to the entire longitudinal length of the rear torso region, and a rear leg region located 75 to 100% forward of the rear edge of the rear torso region with respect to the entire longitudinal length of the rear torso region, the contraction length in the width direction of the lower abdomen region is longer than the contraction length in the width direction of the front leg region, the contraction length in the width direction of the upper back region is longer than the contraction length in the width direction of the rear waist region, and the difference between the longest contraction length and the shortest contraction length in the rear torso region is greater than the difference between the longest contraction length and the shortest contraction length in the front torso region. An absorbent article.

2. The absorbent article according to claim 1, wherein the contraction length in the width direction of the lower abdomen region is longer than the contraction length in the width direction of the upper abdomen region.

3. The absorbent article according to claim 2, wherein the contraction length in the width direction of the upper abdomen region is longer than the contraction length in the width direction of the front waist region.

4. The difference between the shrinkage length in the width direction of the front waist region and the shrinkage length in the width direction of the upper abdominal region is smaller than the difference between the shrinkage length in the width direction of the upper abdominal region and the shrinkage length in the width direction of the lower abdominal region. The absorbent article according to claim 3.

5. The shrinkage length in the width direction of the upper abdominal region is longer than the shrinkage length in the width direction of the front leg region. The absorbent article according to any one of claims 1 to 4.

6. The shrinkage length in the width direction of the lower abdominal region is longer than the shrinkage length in the width direction of any region of the front torso surrounding region. The absorbent article according to any one of claims 1 to 5.

7. The shrinkage length in the width direction of the upper back region is longer than the shrinkage length in the width direction of the lower back region. The absorbent article according to any one of claims 1 to 6.

8. The shrinkage length in the width direction of the rear leg region is shorter than the shrinkage length in the width direction of the lower back region. The absorbent article according to any one of claims 1 to 7.

9. The difference between the shrinkage length in the width direction of the upper back region and the shrinkage length in the width direction of the lower back region is larger than the difference between the shrinkage length in the width direction of the upper back region and the shrinkage length in the width direction of the rear waist region. The absorbent article according to claim 8.

10. The shrinkage length in the width direction of the rear waist region is longer than the shrinkage length in the width direction of the lower back region. The absorbent article according to any one of claims 1 to 9.

11. The shrinkage length in the width direction of the upper back region is longer than the shrinkage length of any region of the rear torso surrounding region. The absorbent article according to any one of claims 1 to 10.

12. The tensile stress in the width direction of the rear waist region is higher than the tensile stress in the width direction of the upper back region. The absorbent article according to any one of claims 1 to 11.

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