JP7554636B2 - Absorbent articles - Google Patents

Description

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

Absorbent articles such as disposable diapers are worn to cover the abdominal and back regions of the body and are configured to prevent slipping down (for example, see Patent Document 1 below). The absorbent article of Patent Document 1 is configured to prevent the absorbent article from slipping down due to the movement of the wearer's body. More specifically, a first stretchable section and a second stretchable section located closer to the crotch than the first stretchable section are provided in the rear waist region. The first stretchable section and the second stretchable section are arranged with a gap in the longitudinal direction. The stretchable stress of the first stretchable section and the stretchable stress of the second stretchable section are greater than the stretchable stress of the region between the first stretchable section and the second stretchable section. Therefore, when the absorbent article is worn, the first stretchable section and the second stretchable section are in close contact with the body, and the region between the first stretchable section and the second stretchable section is relatively loose.

For example, when the wearer bends and straightens his/her legs, the second elastic part located on the crotch side in the rear waist region is pulled toward the crotch side. In addition, as the second elastic part moves toward the crotch side, the area between the first elastic part and the second elastic part is also pulled toward the crotch side. The area between the first elastic part and the second elastic part has a relatively small elastic stress and is not in close contact with the body. Therefore, when a force pulling in the longitudinal direction is applied to the rear waist region of the disposable diaper due to the wearer's body movement, the area between the first elastic part and the second elastic part becomes a buffer area and can absorb the elastic change of the skin due to the body movement. Therefore, it is possible to suppress the first elastic part from shifting toward the crotch side. In addition, the first elastic part and the third elastic part are connected, and the second elastic part and the third elastic part are connected. In other words, the elastic part in the front waist region and the elastic part in the rear waist region are arranged to cover the entire waist of the wearer. Therefore, if the second stretchable part shifts toward the crotch area, it can be pulled back to its original position by the third stretchable part. In this way, the absorbent article of Patent Document 1 is configured to prevent shifting.

JP 2015-202246 A

There is a great need to prevent absorbent articles from slipping, and there is still room for improvement. In particular, if the absorbent article does not fit the wearer's body shape, slippage occurs at the mismatched parts, and there is a risk that the entire absorbent article will slip when worn. Therefore, the objective is to provide an absorbent article that can further prevent the absorbent article from slipping down.

The absorbent article according to one embodiment has a longitudinal direction and a transverse direction perpendicular to each other, a front waist region, a rear waist region, 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. The front waist region and the rear waist region are provided with a plurality of regions that divide the front waist region and the rear waist region in the longitudinal direction. The plurality of regions include a front waist region located 0-25% 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 25-50% 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 50-75% 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 75-100% rearward from the front edge of the front waist region with respect to the entire longitudinal length of the front waist region. The widthwise contraction length of the lower abdomen region is longer than the widthwise contraction length of the front leg region.

FIG. 1 is a schematic front view of an absorbent article according to the present embodiment. FIG. 2 is a schematic plan view of the absorbent article according to the present embodiment in an unfolded state. FIG. 3 is a schematic cross-sectional view taken along the line F3-F3 shown in FIG. FIG. 4 is a schematic diagram showing a state in which the absorbent article is worn by a wearer.

(1) Overview of the embodiment At least the following points will become apparent from the description of this specification and the accompanying drawings.
An absorbent article according to one embodiment has a longitudinal direction and a transverse direction perpendicular to each other, a front waist region, a rear waist region, 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. The front waist region and the rear waist region are provided with a plurality of regions obtained by dividing the front waist region and the rear waist region in the longitudinal direction. The plurality of regions include a front waist region located 0-25% rearward from the front edge of the front waist region with respect to the entire length of the front waist region in the longitudinal direction, an upper abdomen region located 25-50% rearward from the front edge of the front waist region with respect to the entire length of the front waist region in the longitudinal direction, a lower abdomen region located 50-75% rearward from the front edge of the front waist region with respect to the entire length of the front waist region in the longitudinal direction, and a front leg region located 75-100% rearward from the front edge of the front waist region with respect to the entire length of the front waist region in the longitudinal direction. The contraction length of the lower abdomen region in the width direction is longer than the contraction length of the front leg region in the width direction. The wearer's body shape changes in the waist size in the longitudinal direction of the absorbent article. As a result of the applicant's intensive research, the waist size 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, the region with a long contraction length has a long contraction length in the process of changing from the stretched state to the natural state, and changes due to contraction are large. Since the contraction length of the lower abdomen region abutting on the part of the abdomen with a short waist size (depression) is long and the contraction length of the front leg region abutting on the part that bulges out more than the depression is relatively short, the absorbent article itself deforms into a shape that follows the unevenness of the body. By arranging the part of the absorbent article with a short dimension in the depression of the body, the absorbent article can be caught in the depression and the absorbent article can be prevented from slipping.

According to a preferred embodiment, the contraction length of the lower abdomen region in the width direction is longer than the contraction length of the upper abdomen region in the width direction. The waist size of the wearer's abdomen is short near the depression at the lower end of the abdomen, and gradually increases from the depression upward. According to this embodiment, the contraction length of the lower abdomen region is long, and the contraction length of the upper abdomen region and the front leg region that abut the portion that bulges from the depression is relatively short, so that the absorbent article itself deforms into a shape that follows the unevenness of the body. By arranging the short portion of the absorbent article in the depression of the body, the absorbent article can be caught in the depression and the absorbent article can be prevented from shifting.

According to a preferred embodiment, the contraction length of the upper abdominal region in the width direction is longer than the contraction length of the front waist region in the width direction. The waist circumference 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 upward. According to this embodiment, the waist circumference of the absorbent article in its natural state increases in the order of the lower abdominal region, the upper abdominal region, and the front waist region. The absorbent article itself deforms to a shape that conforms to the bulge of the abdomen, thereby preventing slippage.

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 in the waist size of the wearer's abdomen is not constant but varies. More specifically, the rate of change in the waist size of the wearer's abdomen is F12-F11<F13-F12. According to this embodiment, the shape of the absorbent article is more closely matched to the shape of the body, and slippage of the absorbent article can be suppressed.

According to a preferred embodiment, the contracted length of the upper abdomen region in the width direction is longer than the contracted length of the front leg region in the width direction. The front leg region is an area where the base of the foot is located and is easy to move in accordance with the movement of the foot. According to this embodiment, the contracted length of the front leg region is relatively short, so that the width direction length of the front leg region when worn is secured, and the fit can be improved without inhibiting the movement of the base of the foot.

According to a preferred embodiment, the contraction length of the lower abdominal region in the width direction is longer than the contraction length of any of the front waist regions. According to this embodiment, the contraction length of the lower abdominal region that abuts against a portion (depression) with a short waist dimension in the abdomen is long, so that the absorbent article can be easily caught in the depression, and the absorbent article can be prevented from slipping.

According to a preferred embodiment, the multiple regions include a rear waist region located 0-25% forward of the rear end edge of the rear waist region in the longitudinal direction of the entire length of the rear waist region, an upper back region located 25-50% forward of the rear end edge of the rear waist region in the longitudinal direction of the entire length of the rear waist region, a lower back region located 50-75% forward of the rear end edge of the rear waist region in the longitudinal direction of the entire length of the rear waist region, and a rear leg region located 75-100% forward of the rear end edge of the rear waist region in the longitudinal direction of the entire length of the rear waist region. The contraction length of the upper back region in the width direction is longer than the contraction length of the rear waist region in the width direction. At the wearer's back, the waist size decreases as it moves away from the bulge of the buttocks to the upper side. The upper back region is located above the apex of the bulge of the buttocks, and the rear waist region is located near the waist (the narrowest part of the torso). The change in the waist circumference gradually decreases from the apex of the buttocks toward the upper side, and the waist area is flat with little outward bulge. Since the contraction length of the upper back region is longer than that of the rear waist region, the absorbent article itself deforms to a shape that conforms to the contours of the body from the buttocks toward the upper side at the back, preventing the absorbent article from slipping. Furthermore, since the contraction length of the upper back region is relatively long, the waist circumference of the upper back region becomes shorter when worn, fitting into the depression above the buttocks, preventing the absorbent article from slipping. Furthermore, the contraction length of the rear waist region, which corresponds to the flat-shaped portion near the waist, is short, ensuring the waist circumference around the waist when worn. Therefore, the rear waist region is prevented from slipping down toward the crotch due to contraction.

According to a preferred embodiment, the contraction length of the upper back region in the width direction is longer than the contraction length of the lower back region in the width direction. The lower back region is positioned so as to cover the apex of the buttocks. The width direction length of the lower back region can be secured, and the fit can be improved without excessively pressing on the buttocks. In addition, by shortening the width direction length of the upper back region located above the apex of the buttocks, the absorbent article can be caught in a depression above the apex of the buttocks, and the absorbent article can be prevented from slipping down. In other words, the absorbent article itself deforms in a shape that follows the unevenness of the body from the buttocks bulge upward in the back, and the absorbent article can be prevented from slipping down.

According to a preferred embodiment, the contraction length of the rear leg region in the width direction is shorter than the contraction length of the lower back region in the width direction. According to this embodiment, the contraction length of the rear leg region is short, and the width direction length of the rear waist region toward the crotch region can be secured. Therefore, the absorbent core is prevented from shrinking, and the absorption performance of bodily fluids can be secured. In addition, by suppressing the shrinkage of the absorbent core, the occurrence of unintended wrinkles in the absorbent core can be suppressed, and the deterioration of the absorption performance of bodily fluids due to the unintended wrinkles continuing to the crotch region can be suppressed. Since the contraction length of the rear leg region is relatively short, the width direction length of the rear leg region when worn can be secured, and the wearing comfort can be improved without inhibiting the movement of the hips.

According to a preferred embodiment, the difference between the contracted length of the upper back region and the contracted length of the lower back region is greater than the difference between the contracted length of the upper back region and the contracted length of the rear waist region. From the apex of the buttocks bulge where the lower back region is located to the upper side of the bulge where the upper back region is located, the rate of change in the waist circumference is high, and the rate of change in the waist circumference when bending is particularly high. According to this embodiment, the difference between the contracted length of the upper back region and the contracted length of the lower back region is large, making it easier to conform to the shape of the body.

According to a preferred embodiment, the contracted length of the rear waist region is longer than the contracted length of the lower back region. The waist circumference of the area near the waist where the rear waist region is applied is shorter than the waist circumference of the bulging part of the buttocks where the lower back region is applied. According to this embodiment, the absorbent article itself deforms into a shape that conforms to the irregularities of the body, so that the absorbent article does not adhere too closely to the bulging part of the body, but is caught in the depression, and the absorbent article is prevented from shifting.

According to a preferred embodiment, the contraction length of the upper back region in the width direction is longer than the contraction length of any of the rear waist regions. According to this embodiment, by shortening the waist dimension of the upper back region that is placed above the bulge of the buttocks, even if the rear waist region is pulled toward the crotch, the upper back region can be caught above the bulge of the buttocks and prevented from slipping down.

According to a preferred embodiment, the difference between the longest and shortest contraction lengths in the rear waist region is greater than the difference between the longest and shortest contraction lengths in the front waist region. The back side is more likely to expand and contract than the ventral side during movements such as bending and straightening the wearer's legs. If the shape of the absorbent article itself is misaligned with the contours of the body, the absorbent article will be more likely to slip during movement. According to this embodiment, the absorbent article achieves a shape that follows the contours of the body, which increases the conformability of the absorbent article during movement and reduces slippage.

According to a preferred embodiment, the tensile stress in the width direction of the rear waist region is higher than that of the upper back region. According to this embodiment, the rear waist region has a higher tensile stress than the upper back region, and tends to exert a higher pressure on the body. Also, the rear waist region has a shorter contraction length and a smaller contraction amount than the upper back region, and is therefore easier to maintain its position relative to the body. Because the rear waist region shifts less and exerts a higher pressure on the body, it is possible to prevent a gap from being created between the rear waist opening and the wearer when the wearer moves.

(2) Overall Schematic Configuration of Absorbent Article Hereinafter, the absorbent article according to the embodiment will be described with reference to the drawings. 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 are different from the actual ones. Therefore, the specific dimensions should be determined with reference to the following description. In addition, the drawings may include parts with different dimensional relationships and ratios. 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 according to the present embodiment in an unfolded state. FIG. 2 shows an extended state in which the absorbent article 1 is extended to a state in which no wrinkles are formed in a state in which the side joints described later are released. FIG. 3 is a schematic cross-sectional view of the absorbent article taken along the line F3-F3 in FIG. 2. Note that, for convenience of explanation, some components are omitted from the drawings. In addition, even if the components are spaced apart in the thickness direction for convenience of explanation, they may be in contact with each other in the thickness direction in an actual product.

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

The absorbent article 1 has a front waist region S1 arranged on the wearer's abdomen, a rear waist region S2 arranged on the wearer's back, and a crotch region S3 arranged under the wearer's crotch and between the front waist region S1 and the rear waist region. As shown in FIG. 1, the absorbent article 1 may have a side joint 16 that joins the outer portion of the front waist region S1 and the outer portion of the rear waist region S2. As shown in FIG. 1, with the side joint 16 formed, the absorbent article 1 is formed with a waist opening 17 through which the wearer's waist passes and a pair of leg openings 18 through which the wearer's legs are inserted. The waist opening 17 may be defined by a front edge S1F of the front waist region S1 and a rear edge S2R of the rear waist region S2.

In the pants-type absorbent article 1, the crotch region S3 may be defined by the inner edge of the side joint 16 in the longitudinal direction L. The boundary between the front waist region S1 and the crotch region S3 may be defined by the rear edge 16R of the side joint 16 in the front waist region S1. The boundary between the rear waist region S2 and the crotch region S3 may be defined by the front edge 16F of the side joint 16 in the rear waist region S2. The crotch region S3 may be defined by the region in which the leg openings 18 are provided. The leg openings 18 are recessed inward in the width direction W from the outer edge of the absorbent article 1. The boundary between the front waist region S1 and the crotch region S3 may be defined by the front edge of the leg openings 18. The boundary between the rear waist region S2 and the crotch region S3 may be defined by the rear edge of the leg openings 18.

In this specification, the outer portion refers to a portion occupying a certain range in the width direction W including the outer edge in the width direction W, and the outer edge refers to the outer edge in the width direction W. In this specification, the inner portion refers to a portion occupying a certain range in the width direction W including the inner edge in the width direction W, and the inner edge refers to the inner edge in the width direction W. In addition, the front end and rear end refer to portions occupying a certain range in the longitudinal direction L including edges in the longitudinal direction L, and the front end edge and rear end edge are edges in the longitudinal direction L. The outer end includes the front end and rear end, and the outer edge includes the front end edge and rear end edge.

The absorbent article 1 may have an absorbent body 20 and an exterior body 50. The absorbent body 20 may be configured as a separate body from the exterior body 50. The absorbent body 20 is arranged 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 waist region S1, or may extend across the front waist region S1, the rear waist region S2 and the crotch region S3. The absorbent body 20 overlaps with the exterior body 50 in the thickness direction T in the front waist region S1 and the rear waist region S2. The exterior body 50 is arranged at least in the front waist region S1 and the rear waist region S2. The absorbent body 20 may have an absorbent body 30, a top sheet 41, a back sheet 42 and a side sheet 47. The absorbent body 30 has at least an absorbent core 31 containing an absorbent material. The absorbent material may include, for example, ground pulp or superabsorbent polymer (SAP), or a mixture thereof. The absorbent core 31 is disposed in at least the crotch region S3 and may extend from the front waist region S1 to the rear waist region S2. The absorbent body 30 may have a core wrap 32 that covers the absorbent core 31. The core wrap 32 may be made of, for example, tissue or nonwoven fabric.

The absorbent body 30 may have a low basis weight section LR in which the basis weight of the absorbent material is lower than that of the surrounding area. In this embodiment, in the low basis weight section LR, no absorbent core 31 is arranged in the thickness direction T, but a core wrap 32 is arranged. Therefore, the basis weight of the absorbent material in the low basis weight section LR is 0. Note that the basis weight of the absorbent material being 0 only needs to be substantially 0, and it is sufficient that the absorbent core 31 is substantially absent in the low basis weight section LR. The low basis weight section LR may be present due to the flow of a portion of the surrounding absorbent core 31.

The top sheet 41 is located on the skin-facing side T1 of the absorbent body 30. At least a portion of the top sheet 41 (e.g., a portion not covered by the side sheet 47) is located on the skin-facing side T1 of the absorbent article and contacts the wearer's skin. The top sheet 41 only needs to be liquid-permeable and may be made of, for example, a nonwoven fabric. The back sheet 42 is located on the non-skin-facing side T2 of the absorbent body 30. The back sheet 42 only needs to be liquid-impermeable and may be made of, for example, a film. The side sheet 47 is located outside the center of the width direction W of the absorbent core 31. The side sheet 47 may be located on the skin-facing side T1 of the top sheet. The side sheet 47 may be made of, for example, a nonwoven fabric.

The exterior body 50 may be disposed on the non-skin facing side T2 of the absorbent body 20. The exterior body 50 may be composed of multiple sheet members. The multiple sheet materials may be composed of nonwoven fabric, for example. The exterior body in the front waist region S1 and the exterior body in the rear waist region S2 may be spaced apart in the longitudinal direction L. The exterior body 50 may have waist elastic members 55 arranged in the front waist region S1 and the rear waist region S2 in a stretched state in the width direction W. The waist elastic members 55 may be composed of thread-like or string-like elastic members extending in the width direction W, or may be composed of sheet-like elastic members.

The absorbent article 1 of this embodiment is configured to prevent the absorbent article 1 from slipping down. Next, the configuration for preventing the absorbent article 1 from slipping down will be described in detail. The front waist region S1 and the rear waist region S2 are provided with a plurality of regions that divide the front waist region S1 and the rear waist region S2 in the longitudinal direction L. Each region is configured to have an appropriate shrinkage length. Each region deforms in a different manner depending on the shrinkage length, making the absorbent article 1 less likely to slip down. The multiple regions include a front waist region F11 located 0-25% behind the front end edge S1F of the front waist region S1 in the longitudinal direction L of the front waist region S1, an upper abdomen region F12 located 25-50% behind the front end edge S1F of the front waist region S1 in the longitudinal direction L of the front waist region S1, a lower abdomen region F13 located 50-75% behind the front end edge S1F of the front waist region S1 in the longitudinal direction L of the front waist region S1, and a front leg region F14 located 75-100% behind the front end edge S1F of the front waist region S1 in the longitudinal direction L of the front waist region S1. 14, a rear waist region R11 located 0-25% forward from the rear end edge S2R of the rear waist region S2 relative to the entire length of the rear waist region S2 in the longitudinal direction L, an upper back region R12 located 25-50% forward from the rear end edge S2R of the rear waist region S2 relative to the entire length of the rear waist region S2 in the longitudinal direction L, a lower back region R13 located 50-75% forward from the rear end edge of the rear waist region S2 relative to the entire length of the rear waist region S2 in the longitudinal direction L, and a rear leg region R14 located 75-100% forward from the rear end edge of the rear waist region S2 relative to the entire length of the rear waist region S2 in the longitudinal direction L.

Each region in the shrinkage length is the region of the entire absorbent article 1 (the region including the exterior body 50 and the absorbent main body 20). The shrinkage length in the width direction W of each region can be measured by the following method. After leaving the absorbent article 1 for 2 hours in an environment with a temperature of 23°C ± 2°C and a humidity of 50% ± 5%, the absorbent article 1 is stretched until wrinkles are no longer visible, and the boundaries of the front waist region S1 and the rear waist region S2 are marked and the length in the width direction W of each region is measured. In an absorbent article having side joints, the length in the width direction W of each region is the length between the inner edges of the side joints. When the width direction length changes within a region, the average length of the longest part and the shortest part is used. Next, for the absorbent article 1 having the side joints 16, the side joints 16 are torn to separate the front waist region S1 and the rear waist region S2. When the absorbent body 20 is joined to the front waist region S1 and the rear waist region S2, the joint is not released, but cut into each region to obtain a test piece. The test piece is placed on a stand and left for 60 minutes to return to its natural state. Next, a 5 mm acrylic plate is placed on the test piece, and the test piece is sandwiched between the stand and the acrylic plate to measure the length of the test piece in the width direction. If the test piece is curved, the soft tape measure is curved to measure. Note that when an absorbent body is arranged in a region, it is difficult to sandwich the test piece between the stand and the acrylic plate due to the thickness of the absorbent body, so when the absorbent body is 3 mm or more, the absorbent body is removed and measured. The contraction length can be calculated by the following (Equation 1).
(Formula 1) Contracted length = Length in extended state - Length in natural state (unit: mm)
The measurement data of the contracted length obtained for the absorbent articles 1 according to Examples 1 and 2 is shown in Table 1.

Figure 4 is a schematic diagram showing the state in which the absorbent article 1 is worn by a wearer. Figure 4 is a diagram showing the side of the absorbent article 1 worn in a standing position. The body line of the wearer is indicated by a dashed line BL. As shown in Figure 4, the body shape of the wearer differs between the ventral side and the dorsal side, and the waist size changes in the longitudinal direction L of the absorbent article 1. As a result of intensive research by the applicant, the waist size 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 region of the absorbent article 1 with a long contraction length, the contraction length is long and the change due to contraction is large in the process of changing from the stretched state to the natural state (the state in which the tension force in the width direction is removed by the wearing assistant, etc.). Therefore, in the region of the absorbent article 1 with a long contraction length, the dimension along the waist is short when worn, and it is easy to fit to the concave part of the body. In the absorbent article 1 of this embodiment, the contraction length in the width direction W of the lower abdomen region F13 is longer than the contraction length in the width direction W of the front leg region F14. That is, the contraction length relationship satisfies F13>F14. Since the contraction length of the lower abdomen region F13, which abuts against a portion of the abdomen with a short waist circumference (depression), is long, and the contraction length of the front leg region F14, which abuts against a portion that bulges out more than the depression, is relatively short, the absorbent article 1 itself deforms into a shape that conforms to the unevenness of the body. By arranging the portion of the absorbent article 1 with a short dimension in the depression of the body, the absorbent article 1 gets caught in the depression, and the absorbent article 1 can be prevented from shifting.

The contraction length in the width direction W of the lower abdomen region F13 may be longer than the contraction length in the width direction W of the upper abdomen region F12. In other words, the contraction length relationship may satisfy F13>F12. The waist size of the wearer's abdomen is short near the depression at the lower end of the abdomen and gradually increases from the depression to the upper side. Since the contraction length of the lower abdomen region F13 is long and the contraction length of the upper abdomen region F12 and the front leg region F14 that abut the part that bulges from the depression is relatively short, the absorbent article 1 itself deforms into a shape that follows the unevenness of the body. By arranging the short dimension part of the absorbent article 1 in the depression of the body, the absorbent article 1 is caught in the depression, and the absorbent article 1 can be prevented from shifting. Furthermore, if the contracted length of the upper abdomen region F12 were longer than the contracted length of the lower abdomen region F13, there would be a risk of problems such as the upper abdomen region F12 compressing the expanding portion or shifting toward the concave side of the abdomen. However, by having the absorbent article 1 conform to the shape of the body, such problems can be prevented.

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 waist region F11. In other words, the contraction length relationship may satisfy F12>F11. The waist circumference 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 to the upper side. The waist circumference of the absorbent article 1 in its natural state increases in the order of the lower abdomen region F13, the upper abdomen region F12, and the front waist region F11. The absorbent article 1 itself deforms to a shape that follows the bulge of the abdomen, thereby suppressing slippage. In addition, the vicinity of the navel where the front waist region F11 is located is a part that is easy to move when bending and straightening the legs, etc. By shortening the contraction length of the region covering the easy-to-move part, the absorbent article 1 adheres closely to the body and the absorbent article 1 follows the movement of the body too much, and the absorbent article 1 can be suppressed from twisting.

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 in the waist size of the wearer's abdomen is not constant but varies. More specifically, the rate of change in the waist size of the wearer's abdomen is F12-F11<F13-F12. According to this aspect, the shape of the absorbent article is more closely matched to the shape of the body, and slippage of the absorbent article can be suppressed.

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 an area where the base of the foot is located and is easy to move in accordance with the movement of the foot. By making the contraction length of the front leg region F14 relatively short, the width direction length of the front leg region F14 when worn is secured, and the fit 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 of the front waist 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 fit can be improved without inhibiting the movement of the foot.

The contraction length in the width direction W of the lower abdomen region F13 may be longer than the contraction length of any region of the front waist region S1. That is, the contraction length relationships may satisfy F13>F11, F13>F12, and F13>F14. The waist circumference of the wearer's abdomen is shortest near the depression at the lower end of the abdomen. The contraction length of the lower abdomen region F13, which abuts against the portion of the abdomen with a short waist circumference (depression), is long, and the absorbent article is more likely to get caught in the depression, preventing slippage.

At the wearer's back, the waist size decreases as it moves upward away from the buttocks bulge. The apex of the buttocks bulge is covered by the lower back region R13. The portion covered by the upper back region R12 and rear waist region R11 is recessed more than the portion covered by the lower back region R13. The contracted length in the width direction W of the upper back region R12 may be longer than the contracted length in the width direction of the lower back region R13. In other words, the relationship of the contracted lengths may be R12>R13. The lower back region R13 is positioned so as to cover the apex of the buttocks bulge. The length in the width direction W of the lower back region R13 can be secured, improving the fit without applying too much pressure to the buttocks bulge. In addition, by shortening the length in the width direction W in the natural state of the upper back region R12 located above the apex of the buttocks, the absorbent article 1 is caught on the part above the apex of the buttocks, and the absorbent article 1 can be prevented from slipping down. That is, the absorbent article 1 itself deforms from the apex of the buttocks upward from the apex of the buttocks to a shape that conforms to the unevenness of the body, and the absorbent article 1 can be prevented from slipping down. In addition, the vicinity of the apex of the buttocks where the lower back region R13 is located is a part that is easy to move when bending and straightening the legs. By shortening the contraction length of the region covering the easy-to-move part, the movement of the absorbent article due to the absorbent article following the movement of the body too much can be suppressed, and the tucking of the absorbent article can be suppressed. In addition, the lower back region R13 is positioned opposite the excreted feces. If the contraction length of the lower back region R13 is long, the feces may stick to the body, and the wearing comfort may be deteriorated. However, the lower back region R13 has a relatively short contraction length and does not fit closely to the body. This allows the excreted feces to continue to be contained without being in contact with the body, preventing the comfort of the wearer from deteriorating.

The contraction length in the width direction of the upper back region R12 may be longer than the contraction length in the width direction of the rear waist region R11. In other words, the contraction length relationship may satisfy R12>R11. In the back of the wearer, the waist size decreases as it moves upward from the bulge of the buttocks. The upper back region R12 is located above the apex of the bulge of the buttocks, and the rear waist region R11 is located near the waist (the narrowest part of the torso). The change in the waist size gradually decreases from the apex of the bulge of the buttocks toward the upper side, and in the vicinity of the waist, the shape is flat with little bulging outward from the body. Since the contraction length of the upper back region R12 is longer than the contraction length of the rear waist region R11, the absorbent article 1 itself deforms into a shape that follows the unevenness of the body from the bulge of the buttocks toward the upper side in the back, and the absorbent article 1 can be prevented from shifting. In addition, because the contraction length of the upper back region R12 is relatively long, the girth dimension of the upper back region is short when worn, fitting into the depression above the bulge of the buttocks and preventing the absorbent article from shifting. In addition, the contraction length of the rear waist region, which corresponds to the flat-shaped portion near the waist, is short, ensuring the girth dimension around the waist when worn. This prevents the rear waist region from shifting down toward the crotch area due to contraction.

The contraction length in the width direction of the rear 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. The contraction length of the rear leg region R14 is short, and the width direction length of the rear waist region S2 toward the crotch region S3 side can be secured. Therefore, the absorbent core 31 is suppressed from shrinking, and the absorption performance of bodily fluids can be secured. In addition, by suppressing the shrinkage of the absorbent core 31, the occurrence of unintended wrinkles in the absorbent core 31 is suppressed, and the deterioration of the absorption performance of bodily fluids due to the unintended wrinkles continuing to the crotch region S3 side can be suppressed. Furthermore, the rear leg region R14 is an area where the base of the foot is located and is easy to move following the movement of the foot. By shortening the contraction length of the rear leg region R14, the wearing comfort can be improved without inhibiting the movement of the base of the foot. Preferably, the contracted length in the width direction W of the rear leg region R14 may be shorter than the contracted length of any region of the rear waist region S2. In other words, the contracted length relationships may satisfy R14<R11, R14<R12, and R14<R13. The rear leg region R14 is an area where the base of the foot is located and is easy to move in accordance with the movement of the foot. By shortening the contracted length of the rear leg region R14, the fit can be improved without inhibiting the movement of the base of the foot.

The difference between the contraction length of the upper back region R12 and the contraction length of the lower back region R13 may be greater than the difference between the contraction length of the upper back region R12 and the rear waist region R11. In other words, the relationship of the contraction lengths may satisfy R12-R13>R12-R11. The waist measurement of the wearer's back changes in the degree of bulging upward from the apex of the buttocks. The rate of change in the waist measurement is high from the apex of the buttocks where the lower back region R13 is located to the upper side of the bulge where the upper back region R12 is located, and the rate of change in the waist measurement is particularly high when bending. The large difference between the contraction length of the upper back region R12 and the contraction length of the lower back region R13 makes it easier for the absorbent article to conform to the shape of the body.

The contracted length of the rear waist region R11 may be longer than the contracted length of the lower back region R13. In other words, the contracted length relationship may satisfy R11>R13. The waist circumference near the waist where the rear waist region R11 is applied is shorter than the waist circumference of the bulging part of the buttocks where the lower back region R13 is applied. When worn, the absorbent article 1 itself deforms into a shape that follows the irregularities of the body, so that the absorbent article 1 does not adhere too closely to the bulging part of the body, but rather gets caught in the depressions, preventing the absorbent article 1 from shifting.

The contracted length in the width direction of the upper back region R12 may be longer than the contracted length of any region of the rear waist region S2. In other words, the contracted length relationships may satisfy R12>R11, R12>R13, and R12>R14. By shortening the waist dimension of the upper back region R12 that is placed above the bulge of the buttocks, even if the rear waist region S2 is pulled toward the crotch region S3, the upper back region R12 can be caught above the bulge of the buttocks and prevented from slipping down.

The difference between the longest and shortest contraction lengths in the rear waist region S2 may be greater than the difference between the longest and shortest contraction lengths in the front waist region S1. In this embodiment, the difference between the contraction length of the upper back region R12, which has the longest contraction length in the rear waist region S2, and the rear leg region R14, which has the shortest contraction length in the rear waist region S2, is greater than the difference between the contraction length of the lower abdomen region F13, which has the longest contraction length in the front waist region S1, and the front leg region F14, which has the shortest contraction length in the front waist region S1. The back side is more likely to stretch and contract during movements such as bending and straightening the wearer's legs than the ventral side. If the shape of the absorbent article 1 itself is misaligned with the unevenness of the body, the absorbent article 1 is more likely to slip during movement. However, by realizing a shape that follows the unevenness of the body, the absorbent article 1 has a higher ability to follow the unevenness of the body during movement, and slippage can be suppressed.

In addition, each region of the absorbent article 1 is configured to have an appropriate tensile stress. Each region is deformed in a different manner depending on the difference in tensile stress, and the absorbent article 1 is configured to be less likely to slip down. Each region in the tensile stress is a region of the exterior body 50 (a region not including the absorbent main body 20). The definition and measurement of the tensile stress of each region can be obtained by the following method. For the absorbent article 1 having the side joint portion 16, the side joint portion 16 is torn to separate the front waist region S1 and the rear waist region S2. Next, the absorbent main body 20 is separated from the exterior body 50. After leaving the exterior body 50 in an environment with a temperature of 23°C ± 2°C and a humidity of 50% ± 5% for 2 hours, the exterior body 50 is stretched until wrinkles are no longer visible, and a mark is made on the boundary between the front waist region S1 and the rear waist region S2. The exterior body 50 is cut based on the mark, and a test piece divided into multiple regions can be obtained. Next, both ends (5 mm wide) of the cut test piece are clamped by the chucks (clamping tools) of a tensile tester (Instron). At this time, the distance between the chucks is 100 mm. Next, while one of the chucks in the width direction W is fixed, the other chuck is moved so as to change the distance between the chucks. At this time, the chuck movement speed is 254 mm/min. During the movement of the chuck, the stress related to the chuck is measured, and the stress (N) obtained at 70% (constant width) from the elongated state is defined as "tensile stress". Table 2 shows the measurement data of the tensile stress obtained in the absorbent article 1 according to the above Example 2. Note that, although Table 2 shows only the measurement results according to Example 2, the relationship of the tensile stress in the following description is the same for the absorbent article according to Example 1.

As described above, the wearer's body shape differs between the abdominal side and the back side, and the waist size changes in the longitudinal direction L of the absorbent article 1. As a result of the applicant's intensive research, in the wearer's abdomen, the waist size is shortest near the depression at the lower end of the abdomen, and the waist size increases from the depression at the lower end of the abdomen toward the upper side and the crotch side. In addition, in the wearer's back, the waist size decreases as it moves away from the bulge of the buttocks toward the upper side, and in the vicinity of the waist (the narrowest part of the torso), there is little change in the waist size, and the shape is flat with little bulging outward from the body. The area where the stress is high in the absorbent article 1 is in close contact with the body. At this time, for example, if the area where the stress is high is in close contact with a part of the body where the waist size is relatively long, the area where the stress is high may move to a part where the waist size is short due to the contraction of the absorbent article 1, causing the absorbent article 1 to shift. However, in this embodiment, the tensile stress in the width direction W of the lower abdominal region F13 is greater than the tensile stress in any area of the front waist region S1. That is, the tensile stress relationships satisfy F13>F11, F13>F12, and F13>F14. The tensile stress in the width direction W of the rear waist region R11 is greater than the tensile stress in any region of the rear waist region S2. That is, the tensile stress relationships satisfy R11>R12, R11>R13, and R11>R14. The tensile stress is greatest in the lower abdomen region F13, which is in contact with the part of the abdomen with the shortest waistline, and the tensile stress is greatest in the rear waist region R11, which is in contact with the part of the back with the shortest waistline, and the region with the greatest stress corresponds to the part of the body with the shortest waistline. By applying the region with the greatest stress to the most concave part of the body, the absorbent article 1 fits the shape of the body due to 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 locating the area with high stress in the depression of the body, the shape of the body and the stress of the absorbent article 1 are matched, and it is possible to suppress the shifting of the absorbent article 1. In addition, the rear waist region R11, which has a relatively high stress, fits near the waist on the back side where the body has a flat shape, so it is less likely to shift in the longitudinal direction L when fitted, and it is easier to keep the absorbent article 1 in an appropriate position.

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 stresses may satisfy R12>R13. The tensile stress in the rear waist 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 waist size on the back side gradually decreases from the bulge of the buttocks to the upper side. By increasing the stress of the absorbent article 1 as the waist size of the body decreases, the absorbent article 1 can be made to conform to the wearer's body shape and the deviation of the absorbent article 1 in the longitudinal direction L can be suppressed. In addition, the lower back region R13 is positioned opposite the excreted feces. If the tensile stress of the lower back region R13 is large, the feces may adhere to the body, which may deteriorate the wearing comfort. However, the lower back region R13 has a smaller stress than the rear waist region R11 and upper back region R12, and does not adhere closely to the body. Therefore, the excreted feces can be continuously contained without adhering to the body, and a deterioration in fit can be suppressed. In addition, the bulging part of the buttocks covered by the lower back region R13 is a part of the body that is easy to move during movement. By not adhering too closely to the part of the body that is easy to move during movement, the absorbent article 1 is less likely to fold up due to body movement, and slippage can be suppressed.

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 rear leg region R14. That is, the relationship of the tensile stress may be R13>R14, or R11>R12>R13>R14. The tensile stress in the rear waist region S2 gradually increases in the order of the rear leg region R14, the lower back region R13, the upper back region R12, and the rear waist region R11. The waist size on the rear side becomes shorter from the bulge of the buttocks toward the crotch side. Therefore, the waist size of the part where the rear leg region R14 is located is shorter than the waist size of the part where the lower back region R13 is located. However, the rear leg region R14 is an area where the base of the foot is located and is easy to move following the movement of the foot. By making the tensile stress in the rear leg region R14 relatively small, the fit can be improved without inhibiting the movement of the base of the foot.

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 stresses may satisfy F11<F12. The waist size of the wearer's abdomen is shortest at the depression at the lower end of the abdomen, and increases as it moves away from the depression to the upper side. The tensile stress in the front waist 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 waist size of the body decreases, the absorbent article 1 can be made to conform to the wearer's body shape and the shifting of the absorbent article 1 in the longitudinal direction L can be suppressed. In addition, the bulging part of the abdomen covered by the front waist region F11 is a part where the body is easy to move during movement. By not fitting too closely to the part where the body is easy to move during the movement, the absorbent article 1 is less likely to fold due to the movement of the body, and shifting can be suppressed.

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 stresses may be F13<F11+F12+F14, or F13=F11+F12+F14. If the tensile stress in the lower abdomen region F13 is too large compared to the surroundings, the absorbent article 1 can be prevented from slipping down, but there is a risk of the fit being deteriorated due to localized tightening. By making the tensile stress in the lower abdomen region F13 equal to or less than the sum of the tensile stresses in the other regions of the front waist region S1, the lower abdomen region F13 does not protrude too much relative to the overall pressure of the front waist region S1, and slipping down can be prevented while suppressing discomfort.

The relationship of the tensile stress in the front waist region S1 may satisfy F13>F12>F11>F14. The relationship of the tensile stress can be arranged according to the circumference of the waist of the abdomen, and the absorbent article 1 can be fitted to the lower abdomen region F13, which has a relatively short circumference, and by reducing the stress in the front leg region F14, where the elastic member around the legs is likely to leave marks, the fit of the wearer can be improved without constricting the area around the thighs.

The tensile stress in the width direction W of the rear waist region R11 is greater than the tensile stress in any other region. That is, the tensile stress relationships satisfy R11>F11, R11>F12, R11>F13, and R11>F14. By applying the greatest stress to the most recessed part of the body at the back, it is possible to prevent the absorbent article 1 from shifting in the longitudinal direction L due to contraction of the absorbent article 1. In addition, because the tensile stress in the width direction W of the rear waist region R11 is greater than the tensile stress in any other region, it is possible to prevent shifting by increasing the pressure on the back while reducing pressure on the abdomen. This reduces the feeling of pressure on the wearer's abdomen, improving the fit.

The sum of the tensile stresses in the width direction W of the four regions of the rear waist region S2 may be greater than the sum of the tensile stresses in the width direction W of the four regions of the front waist region S1. That is, the relationship of the tensile stresses satisfies R11+R12+R13+R14>F11+F12+F13+F14. The wearer's body shape is different between the abdomen and the back, with the abdomen being more bulging than the back. The sum of the tensile stresses in the multiple regions of the front waist region S1 is relatively small, so that the absorbent article 1 does not tighten too much on the abdomen side where the body bulges more, and the sum of the tensile stresses in the multiple regions of the rear waist region S2 is relatively large, so that the absorbent article 1 fits well on the back side where the body bulges less, thereby achieving both improved wearing comfort and reduced slippage.

The sum 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 sum 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. In other words, the relationship of the tensile stresses may satisfy F11+R11>F13+R13. When worn, the front waist region S1 and the rear waist region S2 are connected and work together to cover the waist of the wearer. The circumference of the wearer's waist is likely to be shorter near the waist opening than near the lower abdomen. By increasing the sum of the tensile stresses near the waist opening, a stress design that matches the circumference of the front and back of the body can be achieved, and the absorbent article 1 can be prevented from shifting.

The sum 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 sum 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 may be greater than the sum 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. In other words, the relationship of the tensile stresses may satisfy F11+R11>F12+R12 and F13+R13>F12+R12. The circumference of the waist is shortest near the waist opening and becomes longer from the waist opening toward the crotch side. The reason for the longer circumference is due to the bulge of the abdomen and the inclination from the apex of the buttocks. The bulge of the abdomen and the inclination from the apex of the buttocks mainly correspond to the upper abdomen region F12 and the upper back region R12. The combined tensile stress of the upper abdomen region F12 and the upper back region R12 is smaller than the combined tensile stress of the front waist region F11 and the rear waist region R11, so that the absorbent article 1 is positioned along the body without constricting the bulge of the body. The circumference of the waist is shorter due to the depression of the lower abdomen toward the crotch side than the bulge of the abdomen and the inclination from the apex of the buttocks. The combined tensile stress of the lower abdomen region F13 and the lower back region R13 is greater than the combined tensile stress of the upper abdomen region F12 and the upper back region R12, so that it fits the depression of the lower abdomen. The region from the vicinity of the waist opening to the lower end of the abdomen is positioned according to the circumference of the body, suppressing deterioration of the fit due to localized tightening while suppressing the entire absorbent article 1 from shifting.

The sum 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 sum 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 rear leg region R14. That is, the relationship of the tensile stresses may satisfy R11+R12>R13+R14. The shape of the body in the back is recessed toward the upper side, and the rear waist region R11 and the upper back region R12 are relatively recessed regions in the back. By fitting the recessed portion of the back with a strong stress, the absorbent article 1 is prevented from slipping. In addition, the sum 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 sum 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 rear leg region R14. That is, the relationship of the tensile stress may satisfy F11+F12>F13+F14. The shape of the body of the abdomen is recessed on the lower side, and the lower abdomen region F13 and the front leg region F14 are relatively recessed regions in the abdomen. By fitting the recessed portion of the abdomen with strong stress, the absorbent article 1 is prevented from slipping down. The tensile stress in the width direction W of the lower abdomen region F13 may be greater than the average value 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 relatively recessed regions in the back. In addition, the lower abdomen region F13 and the front leg region F14 are relatively recessed regions in the abdomen. By tightening the recessed regions in the abdomen and back strongly, slipping down can be prevented. In addition, by tightening the dorsal side more strongly than the ventral side, the force pulling the dorsal side upwards is increased, and a force is applied in the opposite direction to the direction in which the ventral side shifts downwards. This makes it possible to prevent the absorbent article 1 from slipping down.

The tensile stress in the width direction W of the rear waist region R11 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 stresses may satisfy R11>F13. The tensile stress of the lower abdomen region is greatest in the front waist region S1, and the tensile stress of the rear waist region is greatest in the rear waist region S2, so that the lower abdomen region and the rear waist region pull against each other when worn. At this time, because the tensile stress of the rear waist region is greater than the tensile stress of the lower abdomen region, a force acts obliquely upward from the center of the abdomen toward the side of the body. Therefore, even if a force acts on the crotch region side when absorbing bodily fluids such as urine, the absorbent article 1 can be prevented from being pulled down.

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 abdomen region F13. In other words, the tensile stress relationship may satisfy R12>F13. When worn, the lower abdomen region F13 and the upper back region R12 pull against each other. At this time, since the tensile stress of the upper back region R12 is greater than the tensile stress of the lower abdomen region, a force acts obliquely upward from the center of the abdomen toward the side of the body. Therefore, even if a force acts on the crotch region side when absorbing body fluids such as urine, the absorbent article 1 can be prevented from being pulled down.

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 tensile stress relationship may satisfy F13>R13. The lower abdomen region F13 and the lower back region R13 pull on each other via the side joint 16. At this time, since the tensile stress relationship satisfies F13>R13, the lower abdomen region, which has a relatively large tensile stress, pulls the back side toward the abdomen, thereby improving the fit to the lower end of the abdomen. In addition, since the tensile stress in the rear waist region R11 is relatively large in the back, an upward force is generated, which prevents the absorbent article 1 from slipping down.

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 abdomen region F12. That is, the tensile stress relationship may satisfy R12>F12. Also, preferably, the tensile stress in the width direction W of the upper back region R12 may be at least twice the tensile stress in the width direction W of the upper abdomen region F12. The shape of the body is recessed above the apex of the buttocks where the upper back region R12 contacts, and the part above the lower end of the abdomen where the upper abdomen region F12 is located is bulging. The difference in the waist circumference between the region that starts to recess with respect to the apex of the buttocks and the region that starts to bulge with respect to the lower end of the abdomen tends to be large. By satisfying R12>F12, the tensile stress relationship can be arranged to be more suitable for the shape of the body, and the absorbent article 1 can be prevented from slipping down.

The sum 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 sum 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 abdomen region F12. According to this embodiment, by tightening the back side more strongly than the ventral side near the area that is indented according to the shape of the body, a force is applied in the opposite direction to the downward shift of the ventral side, thereby preventing the absorbent article 1 from slipping down.

In addition to the difference in the stress of the outer body, the configuration of the absorbent body may be changed. More specifically, the low basis weight portion LR may be disposed in a region overlapping with the lower abdomen region F13. The low basis weight portion LR makes it easier for the absorbent core 31 to deform, allowing the lower abdomen region F13 to better fit the depression at the lower end of the abdomen, and further suppressing the shifting of the front waist region S1.

In this way, the absorbent article of this embodiment is designed to have an appropriate tensile stress and contraction length for each stress. Areas with high tensile stress fit closely to the wearer. This allows the area to fit the body and provide high pressure. On the other hand, areas with low tensile stress do not fit too closely to the body. This allows an appropriate amount of space between the body and the absorbent article, ensuring space for storing excrement, preventing the wearer from feeling uncomfortable due to tightness, and preventing the absorbent article from shifting due to excessive movement of the body. In addition, areas with short contraction lengths are less likely to shorten in the width direction W when worn, and are more likely to be positioned along the bulge of the body. Furthermore, areas with short contraction lengths have a small difference between the length in the stretched state and the length in the natural state. Since the contractible length in the area is small, the area is less likely to shift out of position. On the other hand, areas with long contraction lengths are less likely to shorten in the width direction W when worn, and are more likely to be positioned along the indentations of the body.

The configuration for increasing the stress in each region can be realized, for example, by: Increasing the stretch ratio of the waist elastic member placed on the exterior body; Or increasing the number of thread-like or string-like waist elastic members 55; Or increasing the count of the thread-like waist elastic member placed on the exterior body. The configuration for decreasing the stress in each region can be the opposite of the configuration for increasing the stress. The configuration for increasing the contraction length of each region can be realized, for example, by: Increasing the stretch ratio of the waist elastic member placed on the exterior body; Or increasing the number of thread-like or string-like waist elastic members 55; Or increasing the count of the thread-like waist elastic member placed on the exterior body. Note that the count of the elastic member has a relatively large effect on the tensile stress and a relatively small effect on the contraction length. Reducing the material (basis weight or number of sheets) on which the waist elastic member is placed; Or reducing the adhesive for bonding the waist elastic member to the material; Or not placing an absorbent core; Or reducing the basis weight of the absorbent material of the absorbent core. By reducing the amount of materials and adhesives, not placing an absorbent core, or reducing the basis weight of the absorbent material, the rigidity is reduced and the material is more likely to shrink. In addition, a configuration for shortening the shrinkage length of each region can be the opposite of a configuration for lengthening the length. As described above, the shrinkage length is the natural length of each region in the entire absorbent article 1 relative to the stretched state, and the tensile stress is the tensile stress of each region in the exterior body 50. The definitions of the shrinkage length and the tensile stress are different, and the magnitude relationship between them is also different. More specifically, when the shrinkage length of any first region is longer than the shrinkage length of any second region (the first region shrinks more), the tensile stress of the first region is not necessarily greater 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.

The tensile stress in the width direction of the rear waist region R11 may be higher than that of the upper back region R12, and the contraction length in the width direction of the upper back region R12 may be longer than the contraction length in the width direction of the rear waist region R11. That is, the relationship of the tensile stress may be R11>R12, and the relationship of the contraction length may be R12>R11. The rear waist region has a higher tensile stress than the upper back region, and tends to exert a higher pressure on the body. In addition, according to a preferred embodiment, the rear waist region R11 has a shorter contraction length and a smaller contraction amount than the upper back region R12, and is therefore easier to maintain its position on the body. The rear waist region R11 is less likely to shift and exerts a higher pressure on the body, which can prevent a gap from being created between the back waist opening and the wearer during the wearer's movements.

Although the present invention has been described in detail using the above-mentioned embodiment, it is clear to those skilled in the art that the present invention is not limited to the embodiment described in this specification. The present invention can be implemented in modified and altered forms without departing from the spirit and scope of the present invention as defined by the claims. Therefore, the description in this specification is intended to be illustrative and does not have any limiting meaning on the present invention.

It is possible to provide an absorbent article that can prevent the absorbent article from slipping down.

1: absorbent article, 31: absorbent core, LR: low basis weight section, 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 waist region, S1F: front edge, S2: rear waist region, S2R: rear edge, S3: crotch region, L: longitudinal direction, W: width direction

Claims (15)

A longitudinal direction and a width direction perpendicular 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;
an absorbent article having an absorbent core disposed at least in the crotch region,
The front waist region and the rear waist region are provided with a plurality of regions that divide the front waist region and the rear waist region in the longitudinal direction,
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 length of the front waist region in the longitudinal direction, an upper abdomen region located 25 to 50% rearward from the front edge of the front waist region with respect to the entire length of the front waist region in the longitudinal direction, a lower abdomen region located 50 to 75% rearward from the front edge of the front waist region with respect to the entire length of the front waist region in the longitudinal direction, and a front leg region located 75 to 100% rearward from the front edge of the front waist region with respect to the entire length of the front waist region in the longitudinal direction. a rear waist region located 0-25% forward from the rear end edge of the rear waist region with respect to the entire length of the rear waist region in the longitudinal direction; an upper back region located 25-50% forward from the rear end edge of the rear waist region with respect to the entire length of the rear waist region in the longitudinal direction; a lower back region located 50-75% forward from the rear end edge of the rear waist region with respect to the entire length of the rear waist region in the longitudinal direction; and a rear leg region located 75-100% forward from the rear end edge of the rear waist region with respect to the entire length of the rear waist region in the longitudinal direction ,
A contracted length in the width direction of the lower abdomen region is longer than a contracted length in the width direction of the front leg region,
An absorbent article , wherein the contraction length of the upper back region in the width direction is longer than the contraction length of any region of the rear waist region . A longitudinal direction and a width direction perpendicular 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;
an absorbent article having an absorbent core disposed at least in the crotch region,
The front waist region and the rear waist region are provided with a plurality of regions that divide the front waist region and the rear waist region in the longitudinal direction,
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 length of the front waist region in the longitudinal direction, an upper abdomen region located 25 to 50% rearward from the front edge of the front waist region with respect to the entire length of the front waist region in the longitudinal direction, a lower abdomen region located 50 to 75% rearward from the front edge of the front waist region with respect to the entire length of the front waist region in the longitudinal direction, and a front leg region located 75 to 100% rearward from the front edge of the front waist region with respect to the entire length of the front waist region in the longitudinal direction. a rear waist region located 0-25% forward from the rear end edge of the rear waist region with respect to the entire length of the rear waist region in the longitudinal direction; an upper back region located 25-50% forward from the rear end edge of the rear waist region with respect to the entire length of the rear waist region in the longitudinal direction; a lower back region located 50-75% forward from the rear end edge of the rear waist region with respect to the entire length of the rear waist region in the longitudinal direction; and a rear leg region located 75-100% forward from the rear end edge of the rear waist region with respect to the entire length of the rear waist region in the longitudinal direction,
A contracted length in the width direction of the lower abdomen region is longer than a contracted length in the width direction of the front leg region,
An absorbent article, wherein 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 claim 1 or 2 , wherein a contracted length of the lower abdomen region in the width direction is longer than a contracted length of the upper abdomen region in the width direction. The absorbent article according to claim 3 , wherein a contracted length of the upper abdomen region in the width direction is longer than a contracted length of the front waist region in the width direction. The absorbent article of claim 4, wherein a 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 abdomen region is smaller than a difference between the contraction length in the width direction of the upper abdomen region and the contraction length in the width direction of the lower abdomen region. The absorbent article according to claim 1 , wherein a contracted length of the upper abdomen region in the width direction is longer than a contracted length of the front leg regions in the width direction. The absorbent article according to claim 1 , wherein a contraction length of the lower abdominal region in the width direction is longer than a contraction length of any region of the front waist region in the width direction. The absorbent article according to claim 1 , wherein a contracted length of the upper back region in the width direction is longer than a contracted length of the rear waist region in the width direction. The absorbent article according to claim 1 , wherein a contracted length of the upper back region in the width direction is longer than a contracted length of the lower back region in the width direction. The absorbent article according to claim 1 , wherein a contracted length in the width direction of the rear leg region is shorter than a contracted length in the width direction of the lower back region. The absorbent article of claim 10, wherein the difference between the contraction length in the width direction of the upper back region and the contraction length in the width direction of the lower back region is greater than the difference between the contraction length in the width direction of the upper back region and the contraction length in the width direction of the rear waist region . The absorbent article according to claim 1 , wherein a contracted length of the rear waist region in the width direction is longer than a contracted length of the lower back region in the width direction. The absorbent article according to claim 2 , wherein a contracted length of the upper back region in the width direction is longer than a contracted length of any region of the rear waist region. 14. The absorbent article according to claim 1 , wherein the difference between the longest and shortest shrinkage lengths in the rear waist region is greater than the difference between the longest and shortest shrinkage lengths in the front waist region. The absorbent article according to claim 1 , wherein a contraction length of the upper back region in the width direction is longer than a contraction length of both the rear waist region and the front waist region.

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