Absorbent article

Abstract

Provided is an absorbent article capable of suppressing slippage with respect to the back of a wearer when the wearer assumes an anteflexion posture. A rear center region (RC) located at the center in the width direction of a rear waist region (S2) of the absorbent article (10) has a rear waist region (R11) extending from the rear end edge of the absorbent core to the rear end edge of the rear waist region. A front center region (FC) located in the center of the front waist region (S1) in the width direction has a front waist region (F11) extending rearward from the front edge of the front waist region to a length in the front-rear direction of the rear waist region. The contraction force in the width direction of the rear waist region is higher than the contraction force in the width direction of the front waist region.

Description

[0001] This application is a divisional application filed on December 24, 2019 (entering the Chinese national phase on June 25, 2021), with application number 201980086264.4 (international application number PCT / JP2019 / 050577) and title "Absorbent Article". Technical Field

[0002] This invention relates to absorbent articles such as disposable diapers. Background Technology

[0003] Patent Document 1 provides an absorbent article that improves the fit to the wearer's body, particularly the abdomen. The absorbent article of Patent Document 1 has a front waist region covering the abdomen, a back waist region covering the back, and an elastic member that stretches in the width direction within the front waist region. At least a portion of the elastic member is disposed in a region of the front waist region that overlaps with the anterior superior iliac spine. The anterior superior iliac spine is recessed compared to its central bulge in the abdomen. Normally, the elastic member tends to deviate towards the recessed area of ​​the body when contracted. However, the absorbent article of Patent Document 1 suppresses this deviation during contraction by disposing the elastic member in a region that overlaps with the recessed area of ​​the anterior superior iliac spine, thus preventing the waist opening from slipping down.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2006-43068 Summary of the Invention

[0007] In shorts-style absorbent garments, the front waist area and the back waist area are connected. If the front waist area slips due to body movement, the back waist area will also slip. Specifically, if the wearer assumes a forward-bending posture, the wearer's abdomen bulges forward, increasing the waist circumference, and the absorbent garment as a whole tends to shift towards the crotch. In a forward-bending posture, although the absorbent garment is close to the wearer's abdomen, it is not close to the back, and a gap easily forms between the back and the absorbent garment. Therefore, when the absorbent garment as a whole shifts towards the crotch, the back waist area tends to shift as well. Although the absorbent garment in Patent Document 1 ensures that the area of ​​the front waist area overlapping with the anterior superior iliac spine is close to the body, suppressing slippage of the waist opening, it cannot suppress the slippage of the back waist area when the front waist area is close to the body, such as in a forward-bending posture. Therefore, there is a need for an absorbent garment that can suppress slippage relative to the wearer's back when the wearer assumes a forward-bending posture.

[0008] One type of absorbent article is a shorts-shaped absorbent article, having: mutually orthogonal front-back and width directions; a front waist region, a back waist region, and a crotch region disposed between the front waist region and the back waist region; an absorbent body disposed across the crotch region, the front waist region, and the back waist region and having an absorbent core; a side joint portion joining the outer portions of the front waist region and the outer portions of the back waist region, wherein the rear central region of the back waist region located at the center in the width direction has a back waist region extending from the rear end edge of the absorbent core to the rear end edge of the back waist region, the front central region of the front waist region located at the center in the width direction has a front waist region extending from the front end edge of the front waist region to the rear side of the back waist region in the front-back direction, and the contraction force of the back waist region in the width direction is higher than the contraction force of the front waist region in the width direction. Attached Figure Description

[0009] Figure 1 This is a front view of the absorbent article according to the implementation method.

[0010] Figure 2 This is a top view of the absorbent article according to the embodiment.

[0011] Figure 3 yes Figure 2 The image shows a cross-sectional view of the absorbent article along section AA.

[0012] Figure 4 yes Figure 2 The image shows a cross-sectional view of the absorbent article along the BB section.

[0013] Figure 5 This is a diagram schematically illustrating the wearing state of the absorbent article according to the embodiment. Detailed Implementation

[0014] (1) Overview of the implementation method

[0015] From the description in this specification and the accompanying drawings, at least the following matters become clear.

[0016] One type of absorbent article is a shorts-shaped absorbent article, comprising: mutually orthogonal front-back and width directions; a front waist region, a back waist region, and a crotch region disposed between the front waist region and the back waist region; an absorbent body having an absorbent core disposed across the crotch region, the front waist region, and the back waist region; and a side joint portion joining the outer portions of the front waist region and the outer portions of the back waist region, wherein the rear central region of the back waist region located at the center in the width direction has a back waist region extending from the rear end edge of the absorbent core to the rear end edge of the back waist region, and the front central region of the front waist region located at the center in the width direction has a front waist region extending from the front end edge of the front waist region to the back waist region in the front-back direction, wherein the contraction force of the back waist region in the width direction is higher than that of the front waist region in the width direction. According to this form, if the wearer assumes a forward-bending posture, the wearer's abdomen bulges forward, and the waist circumference increases. At this time, the contraction force of the front waist area is low, and the front waist area is more likely to elongate in the width direction than the back waist area. Therefore, it can absorb the deformation of the abdomen bulging forward and suppress the overall deviation of the absorbent material. Moreover, because the contraction force of the back waist area is high, the back waist area is less likely to slip. Furthermore, when returning to the original posture after bending the knees into a forward flexion position, the groin area between the legs moves backward, and the force of the absorbent core in the groin area pressing backward and upward acts on the back waist area. Moreover, when the wearer is being held, the groin area is pressed, and the force of the absorbent core in the groin area pressing backward and upward acts on the back waist area. The back waist area becomes more rigid due to contraction, so it is easy to return to its original position when the force pressing backward and upward from the groin area is applied to the back waist area. Therefore, even if the back waist area slips in the forward flexion position, by returning to the original posture, the waist opening can be pulled upward, and the slippage relative to the wearer's back can be suppressed.

[0017] In a preferred embodiment, the distance in the front-to-back direction between the rear end edge of the absorbent core and the rear end edge of the rear waist region is shorter than the distance in the front-to-back direction between the front end edge of the absorbent core and the front end edge of the front waist region. According to this embodiment, the force applied upwards and backwards via the absorbent core is easily transmitted to the rear end edge of the rear waist region, making it easier to pull up the waist opening of the rear waist region. Furthermore, since the distance in the front-to-back direction between the front end edge of the absorbent core and the front end edge of the front waist region is relatively long, the rigidity of the absorbent core is less affected when the front waist region elongates, making it easier for the front waist region to elongate in a forward-flexing posture. Therefore, the front waist region absorbs the deformation of the abdomen bulging forward in a forward-flexing posture, suppressing the overall deviation of the absorbent material.

[0018] According to a preferred embodiment, the rear outer garment may have a rear body overlapping the absorbent body in the rear waist region. The rear outer garment has a high-rigidity region with higher rigidity than its surroundings, and this high-rigidity region is positioned across the rearward edge of the absorbent body. If the leg is bent into a forward flexion position and then the position is restored, a force pressing upwards and backwards through the absorbent body acts on the rear waist region. The rigidity of the region between the rearward edge of the absorbent body and the rearward edge of the rear waist region is lower than that of the absorbent body. However, by positioning the high-rigidity region across the rearward edge of the absorbent body, the force pressing upwards and backwards through the absorbent body is easily transmitted to the rearward edge of the rear waist region, making it easier to pull the waist opening of the rear waist region upwards.

[0019] In a preferred embodiment, the high-rigidity region may be disposed in the front-to-back direction in an area of ​​more than 50% between the rear end edge of the absorbent body and the rear end edge of the back waist region. According to this embodiment, the force applied upwards and backwards via the absorbent body is more easily transmitted to the rear end edge of the back waist region, making it easier to pull up the waist opening of the back waist region.

[0020] In a preferred embodiment, the outer edge of the high-rigidity region may be located further outward in the width direction than the outer edge of the absorbent core. In this embodiment, the high-rigidity region extends outward in the width direction than the absorbent core. Therefore, the force exerted by pressing backward through the absorbent core can be transmitted to the waist opening side across the entire width direction of the region extending backward from the absorbent core, making it easier to pull up the waist opening in the rear waist area.

[0021] In a preferred embodiment, the rear outer body may have an embossed portion formed by compressing a sheet constituting the rear outer body. Multiple embossed portions are spaced apart along the width direction and extend along the front-rear direction. According to this embodiment, the rigidity of the rear outer body in the front-rear direction is increased, and the force applied upwards from the crotch area to the rear is easily transmitted throughout the entire area of ​​the rear outer body in the front-rear direction. This makes it easier to pull up the waist opening in the rear waist area.

[0022] In a preferred embodiment, the front central region may be divided into multiple regions by subdividing the entire length of the front central region in the front-to-back direction into ten equal parts. The high-contraction region, with the highest contraction force in the width direction, is positioned closer to the crotch area than the front waist region. According to this embodiment, when the wearer assumes a forward-leaning posture and their abdomen bulges forward, the front waist region, located closer to the waist opening than the high-contraction region, extends as the high-contraction region conforms to the lower end of the abdomen's concave portion. The front waist region can further deform to follow the abdominal deformation, thus preventing slippage of the front waist region.

[0023] In a preferred embodiment, the rear waist region may have an extension region extending from the highly contractile region of the front waist region along the width direction, with the rear end edge of the absorbent body located further back than the extension region. In the wearing state, the front waist region and the rear waist region are connected via a side joint, and the extension region extending from the highly contractile region conforms to the body as the highly contractile region contracts, making it difficult to deviate in the front-back direction due to changes in the wearer's posture. Furthermore, if deviation occurs in the region further back than the extension region, it can be pressed upwards and backwards by the rear end edge of the absorbent body located further back than the extension region.

[0024] In a preferred embodiment, the rear end edge of the absorbent core may be located closer to the groin area than the extended region. When the extended region overlaps with the absorbent core, the rigidity of the absorbent core increases due to the contraction of the high-contraction region causing the extended region to conform to the body. When the rigidity of the absorbent core increases, the rigidity difference between the area where the absorbent core is located and the lower back region increases, making it difficult to pull the lower back region upwards when pressed through the absorbent core. Reducing the rigidity difference between the lower back region and the extended region makes it easier to pull the lower back region upwards when pressed backwards through the absorbent core.

[0025] In a preferred embodiment, the absorbent core may have a constricted neck that tapers along the width direction, with the narrowest portion of the constricted neck located further forward than the center of the absorbent article in the front-back direction. This narrowest portion of the absorbent core becomes the part most tightly held between the legs when worn. When returning to the starting position after bending the legs into a forward-leaning posture, a force moving in the front-back direction acts from the narrowest portion of the absorbent core towards the entire area of ​​the absorbent core. Because the narrowest portion of the absorbent core is biased forward, the front-back length of the area further back than the narrowest portion is ensured, increasing the amount of return towards the waist opening when returning to the starting position. Therefore, when pressed backward via the absorbent core, the lower back area is easily pulled upward.

[0026] (2) Overall general structure of absorbent materials

[0027] Hereinafter, the absorbent article of the embodiment will be described with reference to the accompanying drawings. It should be noted that in the following description of the drawings, the same or similar reference numerals are used for the same or similar parts. However, the drawings are schematic, and it should be noted that the proportions of the dimensions may differ from reality. Therefore, specific dimensions should be determined with reference to the following description. Furthermore, the drawings may include parts with different dimensional relationships or proportions. The absorbent article is a panty type, which can be a disposable diaper or a panty-type sanitary napkin. The absorbent article of the first embodiment is a panty-type disposable diaper. Figure 1This is a schematic front view of the absorbent article 10 of this embodiment. Figure 2 This is a schematic top view of the absorbent article 10 of this embodiment. Figure 2 The schematic top view shown represents the extended state of the absorbent article 10, which is stretched to a state where no wrinkles are formed, with the side joint 60 described later unfolded. Figure 3 It is along Figure 2 The sectional view shown is along line AA. Figure 4 It is along Figure 2 The sectional view shown is a section of BB. Furthermore, in Figure 3 and Figure 4 In the sectional view shown, for ease of explanation, each component is shown separately in the thickness direction T. However, in the actual product, each component is connected along the thickness direction T.

[0028] The absorbent article 10 has mutually orthogonal front-to-back direction L and width direction W. The front-to-back direction L is defined by the direction extending towards the front and back of the body. In other words, the front-to-back direction L is the direction that extends back and forth in the unfolded absorbent article 10. Moreover, the absorbent article 10 has a thickness direction T that is orthogonal to both the front-to-back direction L and the width direction W. The absorbent article 10 has a front waist area S1, a back waist area S2, and a crotch area S3. The front waist area S1 is the area facing the wearer's front waist (abdomen). The back waist area S2 is the area facing the wearer's back waist (back). The crotch area S3 is the area located in the wearer's crotch and positioned between the front waist area S1 and the back waist area S2. The crotch area S3 is the area where the leg opening 66, described later, is formed. The junction of the front waist area S1 with the crotch area is the front edge of the leg opening 66, and the junction of the back waist area S2 with the crotch area is the rear edge of the leg opening 66.

[0029] In this embodiment, the absorbent article 10 may have an outer body 15 and an absorbent body 40. The outer body 15 overlaps with the absorbent body 40 in the thickness direction. The outer body 15 may have a front outer body 20 and a rear outer body 30. The front outer body 20 is disposed in the front waist region S1 in areas overlapping with the absorbent body 40 and areas not overlapping with the absorbent body 40. The rear outer body 30 is separated from the front outer body 20 in the front-to-back direction L. The rear outer body 30 is disposed in the rear waist region S2 in areas overlapping with the absorbent body 40 and areas not overlapping with the absorbent body 40. It should be noted that in other embodiments, the outer body 15 may integrate the front outer body 20 and the rear outer body 30 and be disposed from the front waist region S1 to the rear waist region S2.

[0030] like Figure 3As shown, the front outer packaging 20 may include: a front cover sheet 27 disposed on the skin-side T1 of the absorbent body 40; a first front outer packaging sheet 25 disposed on the non-skin-side T2 of the absorbent body 40; a second front outer packaging sheet 26 disposed on the non-skin-side T2 of the first front outer packaging sheet 25; and an outer packaging stretch sheet 28 disposed between the first front outer packaging sheet 25 and the second front outer packaging sheet 26. In the area that does not overlap with the absorbent body 40, the front cover sheet 27, the first front outer packaging sheet 25, the outer packaging stretch sheet 28, and the second front outer packaging sheet 26 are sequentially stacked from the skin-side T1 toward the non-skin-side T2 and joined together. It should be noted that the front cover sheet 27, the first front outer packaging sheet 25, and the second front outer packaging sheet 26 may be composed of different sheets or may be composed of the same sheet folded back.

[0031] The rear outer cover 30 may include: a rear cover sheet 37 disposed on the skin-side T1 of the absorbent body 40; a first rear outer cover sheet 35 disposed on the non-skin-side T2 of the absorbent body 40; a second rear outer cover sheet 36 disposed on the non-skin-side T2 of the first rear outer cover sheet 35; and a rear rubber thread 38 disposed between the first rear outer cover sheet 35 and the second rear outer cover sheet 36. In areas that do not overlap with the absorbent body 40, the rear cover sheet 37, the first rear outer cover sheet 35, the rear rubber thread 38, and the second rear outer cover sheet 36 may be sequentially stacked from the skin-side T1 toward the non-skin-side T2 and joined together. Furthermore, a third rear outer cover sheet 39 may be disposed on the skin-side of the first rear outer cover sheet 35. In the area where the third rear outer packaging piece 39 is configured, the rear cover piece 37, the third rear outer packaging piece 39, the first rear outer packaging piece 35, the rear rubber strip 38, and the second rear outer packaging piece 36 can be sequentially stacked from the skin side T1 towards the non-skin side T2 and joined together. It should be noted that the rear cover piece 37, the first rear outer packaging piece 35, the second rear outer packaging piece 36, and the third rear outer packaging piece 39 can be composed of different pieces or can be composed of the same piece folded back. In this embodiment, the second rear outer packaging piece 36 and the third rear outer packaging piece 39 are composed of the same piece folded back at the waist opening 62.

[0032] like Figure 1As shown, a side joining portion 60 can be provided to join the outer portion of the front waist region S1 and the outer portion of the rear waist region S2. The side joining portion 60 is defined by a portion that interlocks the outer portion of the front waist region S1 and the outer portion of the rear waist region S2 in the width direction W. It should be noted that, in this invention, the outer portion is a portion occupying 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. In this invention, the inner portion is a portion occupying 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. Furthermore, in this invention, the front end portion and the rear end portion are portions occupying a certain range in the front-rear direction L, including the edge in the front-rear direction L, and the front edge and the rear edge are edges in the front-rear 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.

[0033] like Figure 1 As shown, with the side joint 60 formed, the absorbent article 10 has a waist opening 62 for the wearer's body to pass through and a pair of leg openings 66 for the wearer's legs to insert into. The waist opening 62 can be defined by the front edge S1F of the front waist region S1 and the rear edge S2R of the rear waist region S2. Here, Figure 2 The illustration shows the absorbent article 10 unfolded after the connection at the side joint 60 is released. The side joint 60 can extend in the front-to-back direction L in both the front outer body 20 and the rear outer body 30. In the shorts-type absorbent article, the boundary between the front waist area S1 and the crotch area S3 is defined by the rear end edge of the side joint 60 provided on the front outer body 20. Similarly, the boundary between the rear waist area S2 and the crotch area S3 can be defined by the front end edge of the side joint 60 provided on the rear outer body 30.

[0034] like Figure 3As shown, a telescopic member capable of stretching and contracting in the width direction W can be configured in the front waist region S1. The telescopic member can be composed of at least one of a front rubber line 22 capable of stretching and contracting in the width direction W and an outer packaging telescopic piece 28 capable of stretching and contracting in the width direction W. Alternatively, the telescopic member can be constructed by the front outer body 20 itself, which is, for example, a telescopic piece. The front rubber line 22 can have a continuous rubber line 22A continuous in the width direction W and a discontinuous rubber line 22B segmented in the width direction. The discontinuous rubber line 22B can be segmented at least in the area overlapping with the absorbent core 50 to reduce the stretching force. The continuous rubber line 22A can be located forward of the front edge 50F of the absorbent core 50, configured not to overlap with the absorbent core 50. A telescopic member capable of stretching and contracting in the width direction W can be configured in the rear waist region S2. The telescopic member can be composed of at least one of a rear rubber line 38 capable of stretching and contracting in the width direction W and an outer packaging telescopic piece capable of stretching and contracting in the width direction W. Alternatively, the telescopic component can be constructed by the rear outer body 30 itself, for example, by means of a telescopic sheet.

[0035] The absorbent body 40 is disposed across the front outer body 20 and the rear outer body 30. That is, the absorbent body 40 spans the front waist region S1, the rear waist region S2, and the crotch region S3. The absorbent body 40 can be separately constructed from the front outer body 20 and the rear outer body 30. In this case, the absorbent body 40 can be joined to the front outer body 20 and the rear outer body 30 in the front waist region S1 and the rear waist region S2, respectively. The absorbent body 40 includes at least an absorbent core 50. The absorbent core 50 may contain, for example, a pulverized slurry or a superabsorbent polymer (SAP), or a mixture thereof. The absorbent core 50 is disposed at least in the crotch region S3. Preferably, the absorbent core 50 can extend from the front waist region S1 to the rear waist region S2 in the posterior-posterior direction L. The absorbent core 50 can be covered by a core package. The absorbent core 50 may have a necked-out neck 51. The neck 51 of the absorber core 50 is a portion that is recessed from the outer edge 50E of the absorber core 50 in the width direction inward. Furthermore, as... Figure 3 As shown, the absorbent body 40 may have a skin sheet 42A disposed on the skin side of the absorbent core 50, an impermeable sheet 41 disposed on the non-skin side of the absorbent core 50, and a body sheet 42B disposed at a position closer to the non-skin side T2 than the impermeable sheet 41.

[0036] In this embodiment, the absorbent body 40, in the region forward of the absorbent core 50, is arranged from the skin side T1 towards the non-skin side T2 in the order of skin sheet 42A, liquid-impermeable sheet 41, and body sheet 42B. Furthermore, in the region overlapping with the absorbent core 50, the arrangement is from the skin side T1 towards the non-skin side T2 in the order of skin sheet 42A, absorbent core 50, liquid-impermeable sheet 41, and body sheet 42B. The skin sheet 42A and liquid-impermeable sheet 41 can be arranged to sandwich the absorbent core 50 in the thickness direction T. The liquid-impermeable sheet 41 only needs to be liquid-impermeable; for example, it can be made of a membrane. The skin sheet 42A and body sheet 42B only need to be liquid-permeable; for example, they can be made of non-woven fabric.

[0037] like Figure 2 As shown, the front waist region S1 may have a front central region FC located at the center in the width direction W and a front side region FS located outside the front central region FC in the width direction W. The outer edge of the front central region FC coincides with the inner edge of the front side region FS, and is located on an extension line extending from the outer edge 50E of the absorbent core 50 in the front-rear direction. The front side region FS is located on the left and right sides of the front central region. The rear waist region S2 may have a rear central region RC located at the center in the width direction W and a rear side region RS located outside the rear central region RC in the width direction W. The outer edge of the rear central region RC coincides with the inner edge of the rear side region RS, and is located on an extension line extending from the outer edge 50E of the absorbent core 50 in the front-rear direction. In shorts-type absorbent articles, the outer edges of the front side region FS and the rear side region RS are the inner edges of the side joint 60.

[0038] The rear central region RC has a rear waist region R11 extending from the rear end edge 50R of the absorber core 50 to the rear end edge S2R of the rear waist region S2. The rear end edge of the rear waist region R11 coincides with the rear end edge S2R of the rear waist region S2, and the front end edge of the rear waist region R11 coincides with the rear end edge 50R of the absorber core 50. The outer edge of the rear waist region R11 coincides with the outer edge of the rear central region RC. The rear waist region R11 includes a region where only the rear outer casing 30 is disposed and a region where both the rear outer casing 30 and the absorbent body 40 are disposed.

[0039] The front central region FC has a front waist region F11. The front waist region F11 extends rearward from the front edge S1F of the front waist region S1 to the rear waist region R11 in the front-back direction. That is, the front-back length of the front waist region F11 is the same as the front-back length of the rear waist region R11. The width length of the front waist region F11, the width length of the rear waist region R11, and the width length of the absorbent core 50 are all the same. Furthermore, the front central region FC has multiple front central regions obtained by dividing the entire length L of the front-back direction of the front central region FC into ten equal parts. The front central region has a first region extending from the front edge S1F of the front waist region S1 to 10% of the rear, a second region extending from 10% to 20% of the rear, a third region extending from 20% to 30% of the rear, a fourth region extending from 30% to 40% of the rear, a fifth region extending from 40% to 50% of the rear, a sixth region extending from 50% to 60% of the rear, a seventh region extending from 60% to 70% of the rear, an eighth region extending from 70% to 80% of the rear, a ninth region extending from 80% to 90% of the rear, and a tenth region extending from 90% to 100% of the rear.

[0040] In addition, the rear central region RC has multiple rear central regions obtained by dividing the entire length L of the rear central region RC in the front-rear direction into ten equal parts. The rear central region has a first region extending from the rear end edge S2R of the rear waist region S2 to the front 10%, a second region extending from the front 10% to the front 20%, a third region extending from the front 20% to the front 30%, a fourth region extending from the front 30% to the front 40%, a fifth region extending from the front 40% to the front 50%, a sixth region extending from the front 50% to the front 60%, a seventh region extending from the front 60% to the front 70%, an eighth region extending from the front 70% to the front 80%, a ninth region extending from the front 80% to the front 90%, and a tenth region extending from the front 90% to the front 100%.

[0041] Next, the wearing form of the absorbent article constructed in this way will be explained. The absorbent article of this embodiment is configured such that appropriate contraction force is designed in the front waist area S1 and the back waist area S2 to prevent slippage. Figure 5 This shows the wearer wearing absorbent materials from the side. Figure 5 (a) is the state before adopting the forward bend posture. Figure 5 (b) is the state of adopting a forward bending posture. Figure 5 (c) is the state of returning to the original posture after taking a forward bend posture. Figure 5 The BL shown represents the body lines.

[0042] In absorbent materials, the contractile force in the width direction of the lower back region R11 is higher than that in the width direction of the front back region F11. For example... Figure 5 As shown in (b), when the wearer assumes a forward-bending posture, the wearer's abdomen bulges forward, increasing the waist circumference. At this time, the contractile force of the front waist region F11 is low, and the front waist region F11 stretches more easily in the width direction than the rear waist region R11. Therefore, it can absorb the deformation of the forward-bulging abdomen and suppress the overall deviation of the absorbent material. Furthermore, the contractile force of the rear waist region R11 is high, so the rear waist region R11 fits the body closely and is less likely to slip off.

[0043] When Figure 5 (b) When bending the knees and assuming a forward flexion position, the lower back area S2 deviates significantly towards the groin area. Then, sometimes as... Figure 5 (c) shows the legs being restored. At this time, if the crotch area S3 moves backward while being held between the legs, the force of the absorbent core 50 pressing backward on the crotch area S3 acts on the lower back area S2. Moreover, when the wearer is being held, there is a tendency for an assistant, such as a mother, to support the wearer near the crotch or gently pat the crotch area. Even in such cases, the crotch area S3 of the absorbent article 10 is pressed, and the force of the absorbent core 50 pressing backward on the crotch area S3 acts on the lower back area S2. At this time, due to the increased rigidity of the lower back area R11 due to the contraction, the lower back area R11 is easily pressed backward when the force pressing backward on the lower back area R11 from the crotch area S3 side acts on it. Thus, even if the lower back area S2 slips down in a forward-bending position, by restoring the posture, the waist opening 62 can be pulled up, suppressing the slippage relative to the wearer's back.

[0044] like Figure 2 As shown, the distance L52 between the rear end edge 50R of the absorbent core 50 and the rear end edge S2R of the rear waist region S2 in the front-back direction can be shorter than the distance L51 between the front end edge 50F of the absorbent core 50 and the front end edge S1F of the front waist region S1 in the front-back direction. That is, the absorbent core 50 can be positioned towards the rear. The force exerted by the absorbent core 50 to press backward is easily transmitted to the rear end edge S2R of the rear waist region S2, making it easier to pull up the waist opening 62 of the rear waist region S2. Moreover, since the distance L51 between the front end edge 50F of the absorbent core 50 and the front end edge S1F of the front waist region S1 is relatively long, the rigidity of the absorbent core 50 is less affected when the front waist region F11 extends, and the front waist region F11 extends more easily in the forward-bending posture. Thus, the front waist region F11 can absorb the deformation of the abdomen bulging forward in the forward-bending posture, suppressing the overall deviation of the absorbent article 10.

[0045] The rear outer body 30 has a high-rigidity region HR, which is more rigid than its surroundings. The high-rigidity region HR is the region within the rear outer body 30 that is more rigid than the region with the lowest rigidity. For example... Figure 3 As shown, the high rigidity region HR is, for example, the region where the sheets constituting the rear outer body 30 are joined to each other by adhesive 81, the region where the rear cover sheet 37 is disposed, the region where the rear third outer packaging sheet 39 is disposed (the region where the rear second outer packaging sheet 36 is disposed of the folded-back portion), and the region where the sheets constituting the outer body have a large number of layers (e.g., the region where the unfolded sheets are disposed).

[0046] The high-rigidity region HR, viewed from above, can be positioned across the rear end edge 40R of the absorbent body 40. If the posture is returned to normal after bending the legs, a force pressing upwards and backwards through the absorbent body 40 acts on the lower back region S2. The area between the rear end edge 40R of the absorbent body 40 and the rear end edge S2R of the lower back region S2 is less rigid than the absorbent body 40. However, by positioning the high-rigidity region HR across the rear end edge 40R of the absorbent body 40, the force pressing upwards and backwards through the absorbent body 40 is easily transmitted to the rear end edge S2R of the lower back region S2, making it easier to pull upwards the waist opening 62 of the lower back region S2. It should be noted that the high-rigidity region HR only needs to span at least a portion of the width direction of the rear end edge 40R of the absorbent body 40, preferably the entire width direction of the rear end edge 40R of the absorbent body 40. More preferably, multiple high-rigidity region HRs are positioned across the rear end edge 40R of the absorbent body 40. The force exerted by the absorbent body 40 pressing upwards to the rear side is more easily transmitted to the rear edge S2R side of the back waist area S2, making it easier to pull up the waist opening 62.

[0047] The high-rigidity region HR can be configured in the front-to-back direction in an area of ​​more than 50% between the rear end edge 40R of the absorbent body 40 and the rear end edge S2R of the rear waist region S2. Figure 3 The diagram shows the longitudinal direction range of the region R12 between the rear end edge 40R of the absorbent body 40 and the rear end edge S2R of the rear waist region S2. Forces exerted upward and backward pressure via the absorbent body 40 are more easily transmitted to the rear end edge S2R of the rear waist region S2, making it easier to pull upward the waist opening 62 of the rear waist region S2. In this embodiment, a high-rigidity region HR is provided throughout the entire longitudinal direction of the region R12 between the rear end edge 40R of the absorbent body 40 and the rear end edge S2R of the rear waist region S2.

[0048] The outer edge of the high-rigidity region HR can be located further outward in the width direction than the outer edge 50E of the absorber core 50. That is, in the width direction, the high-rigidity region HR extends outward beyond the absorber core 50. Therefore, the force transmitted through the absorber core 50 can be transmitted to the waist opening 62 side across the entire width direction of the area extending rearward from the absorber core 50, making it easier to pull up the waist opening 62 of the rear waist region S2. In this embodiment, the high-rigidity region HR is provided across the entire width direction of the rear waist region S2. As a result, the force pressing upward rearward is easily transmitted across the entire area of ​​the rear waist region S2, making it easier to pull up the entire waist opening 62 of the rear waist region S2.

[0049] The rear outer body 30 can have embossed portions 75 formed by compressing the sheets constituting the rear outer body. Multiple embossed portions 75 can be arranged with spacing along the width direction and extend in the front-rear direction. In this embodiment, the rear first outer packaging sheet 35 has a laminated body 76 formed by stacking two or more sheets, and embossed portions 75 formed by compressing the sheets constituting the laminated body against each other are formed on the laminated body 76. Multiple embossed portions 75 can be arranged with spacing along the width direction and extend in the front-rear direction. It should be noted that the structure extending in the front-rear direction includes not only a structure where the embossed portions extend continuously in the front-rear direction, but also a structure where multiple embossed portions are arranged in the front-rear direction and the assembly of the embossed portions extends continuously in the front-rear direction. The embossed portions increase the rigidity of the rear outer body in the front-rear direction, making it easier to transmit the upward pressure from the crotch area side to the rear side throughout the entire area of ​​the rear outer body in the front-rear direction. This makes it easier to pull up the waist opening 62 of the rear waist area S2.

[0050] On the wearer's abdomen, a depression extending in the width direction (W) is typically formed at the lower end of the abdomen. This lower abdominal depression curves upwards from the center of the width direction (W) towards the outer side of the width direction (W), and is particularly noticeable in infants and young children. The highest contraction area (HS) in the width direction among the multiple areas (areas 1 to 10) of the anterior central region (see reference) is the high-contraction area. Figure 2 The front waist region F11 can be positioned closer to the crotch area than the front waist region F11. When the wearer assumes a forward-flexed posture and the wearer's abdomen bulges forward, with the high-contraction region HS fitting against the lower end of the abdomen's concave portion, the front waist region F11, located closer to the waist opening 62 than the high-contraction region HS, extends. The front waist region S1 can further deform to follow the abdominal deformation, thus preventing the front waist region S1 from slipping off.

[0051] Table 1 below shows the contractile forces in multiple areas of the front central region of this embodiment.

[0052] [Table 1]

[0053] Contraction force (N) First District 0.081 Second Zone 0.065 Third District 0.063 Fourth District 0.066 Fifth District 0.063 Sixth District 0.056 Seventh District 0.317 Eighth District 0.289 Ninth District 0.192 Tenth District 0.005

[0054] In this embodiment, the high-contraction region HS is composed of a seventh region and is positioned closer to the crotch area than the front waist region F11. Furthermore, the high-contraction region HS in this embodiment is provided with a continuous rubber line 22A.

[0055] After careful and repeated discussions, the applicant has determined that the lower abdominal depression is positioned opposite to the following region among several regions of the front central region FC, located at 40-100% of the total length relative to the front-back direction L of the front waist region S1, starting from the front edge S1F of the front waist region S1. Therefore, the high-contraction region HS is preferably located in the fifth to tenth regions of the front central region FC.

[0056] It should be noted that in this embodiment, the "shrinkage force" of each region is measured by the following method. First, when measuring the shrinkage force of each region, a test piece is made as the test object. When the absorbent article 10 has a side joint 60, the side joint 60 is released, and the absorbent article 10 is unfolded. Next, with the absorbent article stretched, the length in the width direction and the length in the front-to-back direction are measured, and a line is drawn at the boundary between the front central region and the front side region. Next, ten test pieces are cut out, dividing the front waist area S1 into ten sections along the front-to-back direction, and each test piece is cut at the boundary between the front central region and the front side region. Furthermore, a front waist area F11 is cut out from the front waist area S1 of another absorbent article 10, and a back waist area R11 is cut out from the back waist area S2. Next, the two ends of the cut test pieces are clamped by the clamps (clamping devices) of a tensile testing machine (Instron). At this time, the distance between the clamps is set to 50 mm. Next, with one side of the clamps fixed in the width direction (W), the other side of the clamps is moved to change the distance between them. The moving speed of the clamps is set to 300 mm / min. It should be noted that the change in the direction of movement of the clamps is made at 95% of the maximum elongation. During the movement of the clamps, the stress on the clamps is measured, and the stress (N) obtained from the state of 60% elongation (constant width) is defined as the "contraction force" of each region. In this way, the contraction force in the width direction from the first region to the tenth region can be obtained.

[0057] The rear waist region S2 has an extension region ER that extends from the high-contraction region HS of the front waist region S1 along the width direction. The extension region ER is a region that extends from the high-contraction region HS along the width direction W when the side joint 60 is engaged. Specifically, when the high-contraction region HS of the front waist region S1 is the seventh region, the region located in the rear waist region S2 among the regions extending along the width direction from the seventh region constitutes the extension region ER. In absorbent articles where the front waist region S1 has the same front-back length as the rear waist region S2, when the high-contraction region HS of the front waist region S1 is the seventh region, the seventh region of the rear waist region S2 constitutes the extension region ER.

[0058] like Figure 2 As shown, the rear end edge 40R of the absorbent body 40 can be located further back than the extension region ER. In the wearing state, the front waist region S1 and the rear waist region S2 are connected via the side joint 60. The extension region ER, extending from the high-contraction region HS in the width direction, conforms to the body as the high-contraction region HS contracts, making it difficult to deviate in the front-back direction L due to changes in the wearer's posture. Furthermore, when deviation occurs in the area further back than the extension region ER, it can be pressed upwards and backwards by the rear end edge 40R of the absorbent body 40, which is located further back than the extension region ER.

[0059] Furthermore, in a modified example, the rear end edge 50R of the absorbent core 50 can be located on the crotch region S3 side closer to the extension region ER. When the extension region ER overlaps with the absorbent core 50, the rigidity of the absorbent core 50 increases because the extension region ER conforms to the body along with the contraction of the high-contraction region HS. When the rigidity of the absorbent core 50 increases, the rigidity difference between the area where the absorbent core 50 is located and the lower back region R11 increases, making it difficult to pull the lower back region R11 upward when pressed by the absorbent core 50. Reducing the rigidity difference between the lower back region R11 and the extension region ER makes it easier to pull the lower back region R11 upward when pressed by the absorbent core 50.

[0060] The narrowest portion 51C, located at the innermost side of the neck 51 of the absorbent core 50 in the width direction, can be positioned forward of the center 10LC in the front-back direction of the absorbent article. Furthermore, in a manner where the narrowest portion 51C has a constant length in the front-back direction, the center of the narrowest portion 51C in the front-back direction L can be positioned forward of the center 10LC in the front-back direction of the absorbent article. The narrowest portion 51C of the absorbent core 50 becomes the part most tightly held between the legs when worn. When returning to the original position after bending the legs into a forward-bending posture, a force moving in the front-back direction acts from the narrowest portion 51C of the absorbent core 50 held between the legs towards the entire area of ​​the absorbent core 50. Because the narrowest portion 51C of the absorbent core 50 is biased forward, the front-back length of the area further back than the narrowest portion 51C can be ensured, increasing the amount of return towards the waist opening 62 when returning to the original position. When pressed via the absorbent core 50, the lower back area R11 is easily pulled upward.

[0061] The present invention has been described in detail above using the embodiments described above. However, it will be understood by 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 invention as defined by the claims. Therefore, the description in this specification is for illustrative purposes only and is not intended to limit the present invention in any way.

[0062] It should be noted that the entire contents of Japanese Patent Application No. 2018-248039, filed on December 28, 2018, are incorporated herein by reference.

[0063] Industrial applicability

[0064] It can provide an absorbent item that can prevent slippage relative to the wearer's back when the wearer is in a forward-bending posture.

[0065] Explanation of reference numerals in the attached figures

[0066] 10: Absorbent material; 20: Front outer casing; 22: Front side rubber strip; 25: First front outer packaging sheet; 26: Second front outer packaging sheet; 27: Front cover sheet; 28: Outer packaging telescopic sheet; 30: Rear outer casing; 35: First rear outer packaging sheet; 36: Second rear outer packaging sheet; 37: Rear cover sheet; 38: Rear side rubber strip; 39: Third rear outer packaging sheet; 40: Absorbent body; 40R: Rear end edge; 41: Liquid-impermeable sheet. 42A: Skin-friendly surface, 42B: Main body, 50: Absorbent core, 60: Side joint, 75: Embossed part, 76: Layered body, F11: Front waist area, R11: Back waist area, HR: High rigidity area, HS: High contraction area, S1: Front waist area, S2: Back waist area, S3: Crotch area, L: Front-to-back direction, T: Thickness direction, T1: Skin-friendly side, T2: Non-skin-friendly side, W: Width direction.

Claims

1. An absorbent article, which is a shorts-type absorbent article, having: The front-to-back and width directions are mutually orthogonal; The front waist area, the back waist area, and the crotch area located between the front waist area and the back waist area; An absorbent body having an absorbent core is disposed across the crotch area, the front waist area and the back waist area; as well as A side joint portion that joins the outer side of the front waist area to the outer side of the rear waist area. in, The rear central region of the rear waist area, located at the center in the width direction, has a rear waist region extending from the rear rear edge of the absorbent core to the rear rear edge of the rear waist area. The outer edge of the rear central region is located on the extension line of the rear waist region extending from the outer edge of the absorbent core along the front-back direction. The front central region of the front waist region, located at the center in the width direction, has a front waist region extending rearward from the front edge of the front waist region to the rear waist region in the front-to-back direction. The outer edge of the front central region is located on the extension line of the front waist region extending from the outer edge of the absorbent core along the front-back direction. The contractile force in the width direction of the lower back region is higher than that in the width direction of the front back region. The front central region has multiple regions obtained by dividing the entire length of the front central region in the front-back direction into ten equal parts. The high-contraction region, which has the highest contraction force in the width direction among the plurality of regions, is positioned on the side closer to the crotch region than the front waist region.

2. The absorbent article according to claim 1, wherein, The high-shrinkage region is located further forward than the front edge of the absorbent core and is configured not to overlap with the absorbent core.

3. The absorbent article according to claim 1, wherein, The high-contraction zone is located in the fifth to tenth zones, which extend from 40% to 100% behind the front edge of the front waist area relative to the front edge of the front waist area.

4. The absorbent article according to claim 3, wherein, The high-contraction zone is located in the seventh region, which extends from 60% to 70% behind the front edge of the front waist area.

5. The absorbent article according to claim 1, wherein, A continuous rubber line is provided in the front waist area, the continuous rubber line extending and contracting in the width direction and remaining continuous in the width direction of the front waist area. The continuous rubber line is disposed in the high-shrinkage region.

6. An absorbent article, which is a shorts-type absorbent article, having: The front-to-back and width directions are mutually orthogonal; The front waist area, the back waist area, and the crotch area located between the front waist area and the back waist area; An absorbent body having an absorbent core is disposed across the crotch area, the front waist area and the back waist area; as well as A side joint portion that joins the outer side of the front waist area to the outer side of the rear waist area. in, The rear central region of the rear waist area, located at the center in the width direction, has a rear waist region extending from the rear rear edge of the absorbent core to the rear rear edge of the rear waist area. The outer edge of the rear central region is located on the extension line of the rear waist region extending from the outer edge of the absorbent core along the front-back direction. The front central region of the front waist region, located at the center in the width direction, has a front waist region extending rearward from the front edge of the front waist region to the rear waist region in the front-to-back direction. The outer edge of the front central region is located on the extension line of the front waist region extending from the outer edge of the absorbent core along the front-back direction. The contractile force in the width direction of the lower back region is higher than that in the width direction of the front back region. The region with a higher contractile force than the average contractile force of all regions is located on the side closer to the crotch area than the front waist region, in the first to tenth regions obtained by dividing the entire length of the front central region into ten equal parts.

7. The absorbent article according to claim 6, wherein, The regions where the contraction force is higher than the average contraction force are multiple adjacent regions in the front-back direction.

8. The absorbent article according to claim 6, wherein, The region with a higher contractile force than the average contractile force is composed of a seventh region extending from 60% to 70% behind the front edge of the front waist region, an eighth region extending from 70% to 80% behind the front edge of the front waist region, and a ninth region extending from 80% to 90% behind the front edge of the front waist region.

9. The absorbent article according to claim 1 or 6, wherein, The rear waist area has a rear outer garment that overlaps with the absorbent body. The rear outer casing is a laminated body consisting of two or more layers of sheets. The laminate has an embossed section formed by compressing the sheets constituting the laminate together. The laminate is disposed over the entire area in the front-back direction of the rear waist region.

10. The absorbent article according to claim 9, wherein, The embossed portions are arranged in multiple spaces along the width direction and extend along the front-back direction.

11. The absorbent article according to claim 1 or 6, wherein, The distance in the front-to-back direction between the rear end edge of the absorbent core and the rear end edge of the rear waist region is shorter than the distance in the front-to-back direction between the front end edge of the absorbent core and the front end edge of the front waist region.

12. The absorbent article according to claim 1 or 6, wherein, The rear waist area has a rear outer garment that overlaps with the absorbent body. The rear outer casing has a high-rigidity region with a higher rigidity than the surrounding area. The high-rigidity region is configured across the rear edge of the absorbent body.

13. The absorbent article according to claim 12, wherein, The high-rigidity region is disposed in the front-to-back direction in an area of ​​more than 50% between the rear end edge of the absorbent body and the rear end edge of the back waist region.

14. The absorbent article according to claim 12, wherein, The outer edge of the high-rigidity region is located on the outer side of the absorption core in the width direction.

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