Absorbent article

Abstract

An absorbent article according to an embodiment of the present invention is provided with a main body comprising: a surface sheet disposed on the skin surface side of a wearer; a back sheet disposed on a non-skin surface side, which is a side opposite to the skin surface side; and an absorbent body disposed between the front sheet and the back sheet, the main body portion extending in the longitudinal direction between the back-side end edge and the ventral-side end edge, the main body portion further comprising a resin opening film disposed between the front sheet and the absorbent body and having a plurality of through-holes, when the ventral side is the direction from the dorsal side edge toward the ventral side edge and the dorsal side is the direction from the ventral side edge toward the dorsal side edge, the opening film is disposed on the dorsal side with respect to the center line in the longitudinal direction of the main body part and on the ventral side with respect to the dorsal side edge in the longitudinal direction of the absorbent body.

Description

Technical Field

[0001] This disclosure relates to absorbent articles. Background Technology

[0002] Patent Document 1 describes an absorbent article comprising: a liquid-permeable top sheet; a liquid-impermeable bottom sheet; an absorbent body disposed between the top sheet and the bottom sheet; a diffuser sheet disposed between the top sheet and the absorbent body; and a cover sheet disposed between the top sheet and the diffuser sheet, having a plurality of through holes. The cover sheet allows bodily fluid that has permeated through the top sheet to move through the multiple through holes towards the diffuser sheet, and prevents bodily fluid remaining in the diffuser sheet from flowing back towards the top sheet. Patent Document 2 describes an absorbent article in which an absorbent sheet is disposed between a top sheet and a second sheet.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent No. 6906922

[0006] Patent Document 2: Japanese Patent No. 5679777 Summary of the Invention

[0007] The problem the invention aims to solve

[0008] The cover sheet described in Patent Document 1 extends to the end of the back side of the absorbent article, so that when urinating, urine that has reached the cover sheet through the top sheet may move along the surface of the cover sheet and leak from the end of the back side of the absorbent article.

[0009] Therefore, the purpose of this disclosure is to provide an absorbent article that can suppress urine leakage while suppressing backflow from the absorbent.

[0010] means for solving problems

[0011] One absorbent article comprises a main body including: a surface sheet disposed on the skin side of the wearer; a back sheet disposed on the non-skin side, which is the opposite side to the skin side; and an absorbent body disposed between the surface sheet and the back sheet. The main body extends longitudinally between a dorsal edge and a ventral edge. The main body also includes a resin-made opening membrane disposed between the surface sheet and the absorbent body, having a plurality of through holes. When the direction from the dorsal edge to the ventral edge is defined as ventral and the direction from the ventral edge to the dorsal edge is defined as dorsal, the opening membrane is positioned on the dorsal side relative to the centerline in the longitudinal direction of the main body, and the dorsal edge of the opening membrane is positioned on the ventral side relative to the longitudinal direction of the absorbent body.

[0012] In the absorbent article described above, the backflow of urine absorbed by the absorbent can be suppressed by using an open membrane disposed between the surface sheet and the absorbent body. Furthermore, the open membrane is positioned on the dorsal side relative to the centerline in the longitudinal direction of the main body, and its dorsal edge relative to the longitudinal direction of the absorbent body is positioned on the ventral side. Even when urine moves along the surface of the open membrane toward the dorsal side, the region of the absorbent body including the dorsal edge (the region of the absorbent body that does not overlap with the open membrane) can absorb the urine. Therefore, urine leakage can be suppressed while suppressing backflow from the absorbent body.

[0013] In one embodiment, the main body may also include a pair of leak-proof pleats disposed on the outside of the absorbent in a transverse direction perpendicular to the longitudinal direction. Each pair of leak-proof pleats includes an upright portion that can stand upright relative to the main body between a dorsal upright point and a ventral upright point. The dorsal upright point is an upright point located on the dorsal side relative to the centerline of the main body in the longitudinal direction, and the ventral upright point is an upright point located on the ventral side relative to the centerline of the main body in the longitudinal direction. An opening membrane is disposed longitudinally between the dorsal and ventral upright points. In this embodiment, even if urine moves along the surface of the opening membrane towards the ventral or dorsal side, the urine is blocked by the ventral or dorsal upright points, thus easily remaining inside the absorbent. Therefore, urine can be effectively absorbed within the absorbent.

[0014] In one embodiment, the main body may have an ventral region covering the wearer's abdomen and a dorsal region covering the wearer's back when worn. The absorbent article also includes a pair of hook and loop fasteners extending outward from the dorsal region in a transverse direction perpendicular to the longitudinal direction, engaging with the ventral region from the non-skin side. When viewed from the skin side, at least a portion of an opening membrane is disposed between the pair of hook and loop fasteners. In this embodiment, the pair of hook and loop fasteners are pulled along the wearer's waistline when worn, thus applying transverse tension to the main body near the opening membrane, thereby stretching the wrinkles that will form on the main body near the opening membrane. Therefore, it is possible to suppress the deterioration of the skin feel of the absorbent article caused by wrinkles.

[0015] In one embodiment, the absorbent article may also include a lateral elastic member that provides stretchability in a lateral direction perpendicular to the longitudinal direction to a portion of the absorbent article. When viewed from the skin side, at least a portion of the opening membrane is positioned overlapping with or along the extension line of the lateral elastic member. In this embodiment, because the lateral elastic member elongates during wear, a lateral tension is applied to the absorbent article near the opening membrane, thereby stretching the wrinkles created in the absorbent article near the opening membrane. Therefore, it is possible to suppress the deterioration of the skin feel of the absorbent article caused by wrinkles.

[0016] In one embodiment, the absorbent may include a low-weight-per-unit-area region and a high-weight-per-unit-area region disposed at longitudinally offset positions, wherein the weight per unit area of ​​the absorbent in the high-weight-per-unit-area region is greater than that in the low-weight-per-unit-area region, and an opening membrane is disposed across the boundary between the low-weight-per-unit-area region and the high-weight-per-unit-area region when viewed from the skin side. In this embodiment, the backflow of urine absorbed in the low-weight-per-unit-area region and the high-weight-per-unit-area region, respectively, can be suppressed.

[0017] In one embodiment, the opening width of the non-skin side opening of each perforation in the open membrane may be narrower than the opening width of the skin side opening. In this embodiment, urine can be prevented from passing through the perforations from the non-skin side of the open membrane. Therefore, the backflow of urine absorbed by the absorbent body can be further suppressed.

[0018] In one embodiment, the main body may also include a pair of upright leak-proof pleats disposed on the outside of the absorbent in a transverse direction perpendicular to the longitudinal direction. Each pair of leak-proof pleats includes side panels covering both sides of the surface sheet in the transverse direction. When the pair of leak-proof pleats are not upright, at least a portion of the opening membrane overlaps with the side panels when viewed from the skin side. In this embodiment, even if urine moves laterally along the surface of the opening membrane, the urine is blocked by the side panels, thus easily remaining inside the absorbent. Therefore, urine can be effectively absorbed within the absorbent.

[0019] In one embodiment, the absorbent may include: an absorbent core having water-absorbing properties; and a core sheath covering at least the non-skin-side surface of the absorbent core, the absorbent core including a groove with a lower weight per unit area than other portions of the absorbent core, the groove being disposed ventrally relative to the open membrane. In this embodiment, the groove can be used to diffuse urine moving ventrally along the surface of the open membrane.

[0020] In one embodiment, the absorbent article may also include a pair of leg-length stretch members disposed along both sides of the main body in a transverse direction perpendicular to the longitudinal direction. When viewed from the skin side, at least a portion of the opening membrane is positioned between the pair of leg-length stretch members. In this embodiment, since the pair of leg-length stretch members extend during wear, tension is applied to the main body near the opening membrane, thereby stretching the wrinkles that are formed in the main body near the opening membrane. Therefore, it is possible to suppress the deterioration of the skin feel of the absorbent article caused by wrinkles.

[0021] In one embodiment, the absorbent body may have an absorbent core with water-absorbing properties, and when viewed from the skin side, the dorsal edge of the opening membrane is positioned to overlap with the portion of the absorbent core that is widest in the transverse direction perpendicular to the longitudinal direction. In this embodiment, even when urine moves along the surface of the opening membrane toward the dorsal side, the portion of the absorbent core with the widest transverse direction can be used to adequately absorb the urine. Therefore, leakage can be further suppressed.

[0022] In one embodiment, a hot-melt adhesive may be linearly applied between at least one of the surface sheet and the open membrane, and between the open membrane and the absorber. Applying the hot-melt adhesive in a linear manner can prevent the hot-melt adhesive from clogging the pores of the open membrane.

[0023] In one embodiment, a hot-melt adhesive may be linearly applied between the surface sheet and the open membrane, and between the open membrane and the absorbent. The area weight of the hot-melt adhesive applied between the open membrane and the absorbent is higher than that applied between the surface sheet and the open membrane. By having a higher area weight of the hot-melt adhesive applied between the open membrane and the absorbent, the backflow of urine absorbed by the absorbent can be effectively suppressed. Therefore, the backflow of urine absorbed by the absorbent can be further suppressed.

[0024] In one embodiment, a guide mark may be formed on the main body in a manner visible from the skin side. This guide mark guides the wearer to a specific location on their body, and at least a portion of the guide mark is positioned to overlap with the opening membrane when viewed from the skin side. In this embodiment, when wearing the absorbent material, by positioning a portion of the wearer's body on the guide mark, the opening membrane can be properly aligned with the wearer's body. As a result, the backflow of urine absorbed by the absorbent material can be effectively suppressed by using the properly positioned opening membrane.

[0025] In one embodiment, the guide marker may have a shape mimicking the shape of a buttock to guide the wearer in positioning their buttocks. In this embodiment, by setting the guide marker to mimic the shape of a buttock, it facilitates the user in aligning the wearer's buttocks with the guide marker.

[0026] In one embodiment, the main body may have an ventral region covering the wearer's abdomen and a dorsal region covering the wearer's back when worn. The absorbent article also includes a pair of hook and loop fasteners extending outward from the dorsal region in a transverse direction perpendicular to the longitudinal direction, engaging with the ventral region from the non-skin side. When viewed from the skin side, a portion of the absorbent is positioned between the pair of hook and loop fasteners, and the opening membrane is positioned on the ventral side relative to the dorsal edge of the hook and loop fasteners in the longitudinal direction. In this embodiment, by engaging the pair of hook and loop fasteners with the ventral region when worn, the absorbent can be tightly fitted to the wearer's body on the dorsal side of the opening membrane. Thus, even if urine moves along the surface of the opening membrane towards the dorsal side, the absorbent can effectively absorb urine.

[0027] The effects of the invention

[0028] According to various embodiments and implementations of this disclosure, it is possible to provide an absorbent article that can suppress urine leakage while suppressing backflow from the absorbent. Attached Figure Description

[0029] Figure 1 This is a plan view of an absorbent article according to one embodiment, viewed from the skin side.

[0030] Figure 2 Observation from the non-skin side Figure 1 The diagram shows the absorbent material.

[0031] Figure 3 yes Figure 1 A cross-sectional view of the absorbent article shown along line AA.

[0032] Figure 4 yes Figure 1 A cross-sectional view of the absorbent article along line BB.

[0033] Figure 5 This is a plan view of the absorbent core.

[0034] Figure 6 It is an enlarged cross-sectional view showing the periphery of the open membrane.

[0035] Figure 7 This is a plan view of an absorbent article according to another embodiment, viewed from the skin side.

[0036] Figure 8 It is a magnified image showing the area surrounding the guide marker.

[0037] Figure 9 This is a plan view of an absorbent article according to another embodiment.

[0038] Figure 10 This is a plan view of an absorbent article according to another embodiment.

[0039] Figure 11 It is a plan view representing an absorbent article with a pair of folded inserts.

[0040] Figure 12 This is a plan view of an absorbent article according to another embodiment.

[0041] Figure 13 This is a plan view of an absorbent article according to another embodiment.

[0042] Figure 14 This is a plan view of an absorbent article according to another embodiment.

[0043] Figure 15 This is a diagram showing a variation of the guide mark. Detailed Implementation

[0044] Embodiments of the present disclosure will now be described with reference to the accompanying drawings. Furthermore, in the following description, the same or equivalent elements will be labeled with the same reference numerals and will not be described repeatedly. The scale of the drawings may not necessarily match the scale of the description.

[0045] Figure 1 This is a plan view of the absorbent article 1 according to one embodiment, viewed from the skin side. Figure 2 This is a plan view of absorbent item 1 when viewed from the non-skin side. Figure 3 yes Figure 1 A schematic cross-sectional view of the absorbent article 1 along line AA. Figure 4 yes Figure 1 A schematic cross-sectional view of the absorbent article 1 along line BB. Figure 1 and Figure 2 The image shows an absorbent article 1 in its unfolded state, stretched out to the point where it does not form wrinkles. Figure 3 and Figure 4 In the sectional view shown, for ease of explanation, the components are shown separately in the thickness direction; however, in the actual product, the components are in contact in the thickness direction. Unless otherwise specified, the following description refers to the positional relationships in the unfolded state.

[0046] Figures 1-4 The absorbent item 1 shown is a disposable diaper with a strap. The absorbent item 1 can be a baby diaper or an adult diaper. In the following description, the person wearing the absorbent item 1 is referred to as the "wearer," and the person who puts the absorbent item 1 on the wearer is referred to as the "user." Typically, the wearer is a child or person being cared for, and the user is a parent or caregiver.

[0047] like Figure 1As shown, the absorbent article 1 extends in a lateral direction X, which is arranged along the wearer's waistline, and in a longitudinal direction Y, which extends from the wearer's abdomen to their back. The lateral direction X corresponds to the width direction of the absorbent article 1, and the longitudinal direction Y corresponds to the length direction of the absorbent article 1. The lateral direction X and the longitudinal direction Y are perpendicular to each other. The thickness direction Z is perpendicular to the lateral direction X and the longitudinal direction Y, and includes the skin-facing side Z1 facing the wearer's skin when worn and the non-skin-facing side Z2 facing the wearer's skin when worn. The absorbent article 1 is worn to cover the wearer's abdomen, groin, and back.

[0048] The absorbent article 1 includes a main body 2. The main body 2 has a ventral end edge 2F located on one side in the longitudinal direction Y and a dorsal end edge 2R located on the other side in the longitudinal direction Y. When worn, the ventral end edge 2F is positioned on the ventral side along the wearer's waistline, and the dorsal end edge 2R is positioned on the dorsal side along the wearer's waistline. The distance in the longitudinal direction Y between the ventral end edge 2F and the dorsal end edge 2R is the total length (maximum length) of the main body 2. In the following description, the direction from the dorsal end edge 2R to the ventral end edge 2F is sometimes referred to as the ventral side, and the direction from the ventral end edge 2F to the dorsal end edge 2R is sometimes referred to as the dorsal side.

[0049] The main body 2 has a back region 51 located on the back side, a ventral region 53 located on the abdomen side, and a crotch region 52 located between the back region 51 and the ventral region 53 in the longitudinal direction Y. The back region 51 covers the wearer's back when worn, and the ventral region 53 covers the wearer's abdomen when worn. The back region 51, the crotch region 52, and the ventral region 53 are arranged sequentially from the back side.

[0050] A pair of back-side flaps 15 extending outward in the lateral direction X are provided on the back side region 51 of the main body 2. The pair of back-side flaps 15 are positioned along the wearer's waist when worn. Each pair of back-side flaps 15 has a side edge 15a in the lateral direction X. The maximum width W1 between the side edges 15a of the pair of back-side flaps 15 in the lateral direction X is greater than the width W2 of the crotch region 52 in the lateral direction X. The maximum width W1 between the side edges 15a of the pair of back-side flaps 15 is equivalent to the maximum width of the main body 2.

[0051] The side edges 15a of a pair of dorsal wing portions 15 have a widened portion 15c and a straight portion 15s. The widened portion 15c bends outward in the lateral direction X as it moves toward the dorsal side, connecting the side edge of the crotch region 52 to the straight portion 15s. Alternatively, the widened portion 15c may also extend in a straight line outward in the lateral direction X along a direction inclined relative to the longitudinal direction Y as it moves toward the dorsal side. The straight portion 15s extends in a straight line in the longitudinal direction Y between the widened portion 15c and the dorsal edge 2R. The width in the lateral direction X between the straight portions 15s corresponds to the maximum width W1 between the side edges 15a of the pair of dorsal wing portions 15.

[0052] In one embodiment, the absorbent article 1 includes a pair of inserts 16 respectively attached to a pair of back flap portions 15. Each pair of inserts 16 is made of nonwoven fabric and has a generally rectangular or generally trapezoidal planar shape. The pair of inserts 16 are attached to the pair of back flap portions 15 using hot melt adhesive (HMA), ultrasonic processing, embossing, or the like. When viewed from the skin-side Z1, the pair of inserts 16 extend outward from the straight portion 15s of the pair of back flap portions 15 in the lateral direction X. The pair of inserts 16 are positioned along the wearer's waistline when worn.

[0053] In one embodiment, the absorbent article 1 has one or more pairs of hook and loop fasteners. Figure 1 In the illustrated embodiment, the absorbent article 1 includes a pair of first hook and loop fasteners 90A and a pair of second hook and loop fasteners 90B. The pair of first hook and loop fasteners 90A and the pair of second hook and loop fasteners 90B are respectively disposed on a pair of inserts 16. The pair of first hook and loop fasteners 90A are positioned on the back side relative to the pair of second hook and loop fasteners 90B. The pair of first hook and loop fasteners 90A and the pair of second hook and loop fasteners 90B are engaged with the ventral region 53 from the non-skin side Z2. A portion of the absorbent body 30, described later, is disposed between the pair of second hook and loop fasteners 90B.

[0054] A pair of first hook and loop fasteners 90A and a pair of second hook and loop fasteners 90B extend outward in the lateral direction X from the outer edges of a pair of inserts 16. Each pair of first hook and loop fasteners 90A and the pair of second hook and loop fasteners 90B has a substrate sheet 91 that engages with the insert 16 and an engagement portion 92 provided on the substrate sheet 91. The engagement portion 92 is, for example, a mechanical hook and loop fastener configured to engage with the back panel 20 of the main body 2 from the non-skin side Z2 side.

[0055] A pair of ventral wing portions 17 extending outward in the lateral direction X are provided in the ventral region 53 of the main body 2. The pair of ventral wing portions 17 are arranged along the wearer's waist when worn. Each pair of ventral wing portions 17 has a side edge 17a in the lateral direction X. The maximum width W3 between the side edges 17a of the pair of ventral wing portions 17 in the lateral direction X is greater than the width W2 of the crotch region 52 in the lateral direction X. As described above, the main body 2 has a shape that narrows between the pair of dorsal wing portions 15 and the pair of ventral wing portions 17.

[0056] The side edges 17a of a pair of ventral wing portions 17 have a widened portion 17c and a straight portion 17s. The widened portion 17c extends outward in the lateral direction X toward the ventral side, connecting the side edge of the crotch region 52 with the straight portion 17s. The straight portion 17s extends in a straight line along the longitudinal direction Y between the widened portion 17c and the ventral edge 2F. The width of the straight portions 17s in the lateral direction X is equivalent to the maximum width W3 between the side edges 17a of the pair of ventral wing portions 17. The length of the straight portion 15s of a pair of dorsal wing portions 15 along the longitudinal direction Y can be longer than the length of the straight portion 17s of a pair of ventral wing portions 17 along the longitudinal direction Y.

[0057] like Figures 1-4 As shown, the main body 2 includes a surface sheet 10, a back sheet 20, and an absorbent body 30. The surface sheet 10 forms a surface in the main body 2 that adheres to the wearer and is positioned on the skin-side Z1. The surface sheet 10 is, for example, made of a liquid-permeable nonwoven fabric that allows the wearer's urine to pass through towards the absorbent body 30. Examples of nonwoven fabrics constituting the surface sheet 10 include hot-air nonwoven fabrics, spunbond nonwoven fabrics, or dot-bonded nonwoven fabrics.

[0058] The back panel 20 forms the outer side of the main body 2 during wear, positioned on the non-skin side Z2. The back panel 20 includes a liquid-impermeable back film 21 and a back nonwoven fabric 22 located further along the non-skin side Z2 than the back film 21. It can be as follows... Figure 3 As shown, the width of the back film 21 in the lateral direction X is shorter than the width of the back nonwoven fabric 22 in the lateral direction X, and the back nonwoven fabric 22 extends to both sides of the back film 21 in the lateral direction X. The back nonwoven fabric 22 constitutes the outermost layer of the absorbent article 1.

[0059] like Figure 3 and Figure 4As shown, the absorbent 30 includes an absorbent core 31 comprising pulp and a superabsorbent polymer (SAP), and a core-cladding layer 32 covering the surface of the absorbent core 31. The pulp of the absorbent core 31 may be, for example, chemical pulp, cellulose fibers, rayon, cellulose acetate, or other cellulose fibers. The SAP may be, for example, a starch-based, acrylic-based, or amino acid-based granular or fibrous polymer. The core-cladding layer 32 covers the upper surface of the absorbent core 31 opposite to the surface sheet 10 and the lower surface of the absorbent core 31 opposite to the back sheet 20. The absorbent core 31 is arranged across the back region 51, the crotch region 52, and the ventral region 53.

[0060] Figure 5 This is a planar view of the absorbent core 31 as observed from the skin's side (Z1). (See diagram below.) Figure 5 As shown, in one embodiment, the absorbent core 31 includes a back portion 33 disposed in the back region 51, a crotch portion 34 disposed in the crotch region 52, and a ventral portion 35 disposed in the ventral region 53. The back portion 33 is disposed at a position closer to the back side than the center line CL1 in the longitudinal direction Y of the main body portion 2, and the ventral portion 35 is disposed at a position closer to the ventral side than the center line CL1 in the longitudinal direction Y of the main body portion 2. The crotch portion 34 includes a first portion 34a and a second portion 34b. The first portion 34a is disposed between the back portion 33 and the second portion 34b. The second portion 34b is disposed between the first portion 34a and the ventral portion 35.

[0061] The width w1 of the dorsal portion 33 in the lateral direction X is greater than the width w3 of the first portion 34a in the lateral direction X. The width w2 of the ventral portion 35 in the lateral direction X is greater than the width w3 of the first portion 34a in the lateral direction X. The width w3 of the first portion 34a in the lateral direction X is greater than the width w4 of the second portion 34b in the lateral direction X. That is, the absorbent core 31 is locally narrowed in the lateral direction X at the crotch portion 34. The width of the absorbent core 31 changes in stages in the longitudinal direction Y. That is, the width of the absorbent core 31 narrows as it approaches the first portion 34a in the region between the dorsal portion 33 and the first portion 34a, and narrows as it approaches the second portion 34b in the region between the first portion 34a and the second portion 34b. In addition, the width of the absorbent core 31 widens as it approaches the ventral portion 35 in the region between the second portion 34b and the ventral portion 35. The width w1 of the dorsal side portion 33 or the width w2 of the ventral side portion 35 is the maximum width of the absorbent core 31.

[0062] Furthermore, the width w5 of the dorsal end edge 31R of the absorbent core 31 in the transverse direction X is smaller than the width w1 of the dorsal portion 33. The width w6 of the ventral end edge 31F of the absorbent core 31 in the transverse direction X is smaller than the width w2 of the ventral portion 35. The width of the absorbent core 31 narrows as it approaches the dorsal end edge 31R in the region between the dorsal portion 33 and the dorsal end edge 31R, and narrows as it approaches the ventral end edge 31F in the region between the ventral portion 35 and the ventral end edge 31F.

[0063] Furthermore, the width of the absorbent core 31 can also vary continuously in the longitudinal direction Y. For example, the absorbent core 31 can also have a gourd-shaped planar shape that is widest in the dorsal region 51 and ventral region 53 and narrows in the crotch region 52.

[0064] like Figure 5 As shown, one or more grooves 38 may also be formed in the absorbent core 31. Figure 5 In the illustrated embodiment, three grooves 38 are formed in the absorbent core 31. The three grooves 38 extend in a straight line parallel to each other along the longitudinal direction Y. Alternatively, the three grooves 38 may be curved relative to the longitudinal direction Y. The weight per unit area of ​​the grooves 38 is set to be lower than the weight per unit area of ​​the other portions of the absorbent core 31. Therefore, the density of pulp fibers and SAP present in the grooves 38 is lower than the density of pulp fibers and superabsorbent polymers present in the other portions of the absorbent core 31. In one embodiment, the grooves 38 may also be slits with zero weight per unit area.

[0065] The central groove 38 of the three grooves 38 extends in the longitudinal direction Y along the center line CL2 in the transverse direction X of the main body 2. That is, when viewed from the skin side Z1, this central groove 38 is positioned on the center line CL2 of the main body 2. The two outer grooves 38 of the three grooves 38 are positioned on the two outer sides of the center line CL2 in the transverse direction X of the main body 2.

[0066] Because the weight per unit area of ​​the groove 38 is lower than that of other parts of the absorbent core 31, the stiffness of the groove 38 is also lower than that of other parts of the absorbent core 31. Therefore, when the absorbent core 31 comes into contact with the wearer's feet while the absorbent article 1 is being worn, the main body 2 can easily be bent into a V-shaped cross-section starting from the groove 38 of the absorbent core 31. Thus, the absorbent article 1 can be easily passed between the wearer's feet.

[0067] In one embodiment, the absorber 30 may also include a low weight-to-weight area region 30l and a high weight-to-weight area region 30h. For example... Figure 4As shown, the low weight-per-unit area region 30l and the high weight-per-unit area region 30h are positioned offset from each other in the longitudinal direction Y. Specifically, the high weight-per-unit area region 30h is positioned on the centerline CL1 in the longitudinal direction Y of the absorber 30, while the low weight-per-unit area region 30l is positioned on the ventral and dorsal sides relative to the high weight-per-unit area region 30h.

[0068] The absorber 30 has a greater area weight per unit area in the high area weight region 30h than in the low area weight region 30l. For example, the amount of SAP per unit area in the high area weight region 30h is greater than the amount of SAP per unit area in the low area weight region 30l. More specifically, the high area weight region 30h and the low area weight region 30l may each have one or more absorber layers 36 containing SAP, with the number of absorber layers 36 in the high area weight region 30h being greater than the number of absorber layers 36 in the low area weight region 30l. Figure 4 In the illustrated embodiment, the high unit area weight region 30h has two absorbent layers 36, while the low unit area weight region 30l has one absorbent layer 36. Therefore, the water retention per unit area of ​​the high unit area weight region 30h is greater than that of the low unit area weight region 30l. Furthermore, the unit area weight in the lateral direction X of the high unit area weight region 30h can be substantially uniform.

[0069] In one embodiment, the absorbent article 1 includes a pair of upright leak-proof pleats 80 disposed on the skin-side of the surface sheet 10. The leak-proof pleats 80 are upright on the outer side of the absorbent body 30 in the transverse direction X, inhibiting leakage of urine excreted into the absorbent body 30 in the transverse direction X. In one embodiment, each pair of leak-proof pleats 80 includes a side panel 12 and a telescopic member 13. The pair of side panels 12 are formed, for example, from a nonwoven fabric with water-repellent or hydrophobic properties. The pair of side panels 12 are disposed separately from each other in the transverse direction X, extending across the entire area in the longitudinal direction Y of the main body 2 between the ventral end edge 2F and the dorsal end edge 2R. Figure 3 As shown, the outer edge of the side piece 12 in the transverse direction X coincides with the outer edge of the back nonwoven fabric 22 in the transverse direction X, and together with one outer edge of the back nonwoven fabric 22, forms the side edge of the main body 2. Furthermore, as... Figure 3 As shown, the inner portion of each side panel 12 in the lateral direction X is folded back towards the non-skin side Z2. A telescopic member 13 extending in the longitudinal direction Y is disposed between the folded side panels 12. The telescopic member 13 is, for example, an elastic band that gives the main body 2 elasticity in the longitudinal direction Y.

[0070] Each of the pair of leak-proof pleats 80 includes: a standing portion 81, which stands upright by the contraction of the telescopic member 13; a lateral fixing portion 82, which serves as the standing fulcrum in the lateral direction X of the standing portion 81; and a longitudinal fixing portion 83, which serves as the standing fulcrum in the longitudinal direction Y of the standing portion 81. The standing portion 81, the lateral fixing portion 82, and the longitudinal fixing portion 83 are formed by side pieces 12. The standing portion 81 is the part of the side piece 12 that is not engaged with the surface piece 10, and the telescopic member 13 in an extended state is disposed in the standing portion 81.

[0071] The lateral fixing part 82 is the part of the side piece 12 that is fixed to the surface piece 10 using a hot melt adhesive or the like, and becomes the standing support point in the lateral direction X of the standing part 81. The lateral fixing part 82 is formed in the entire area of ​​the longitudinal direction Y of the main body part 2 at a position that is outside the lateral direction X of the standing part 81.

[0072] The longitudinal fixing portion 83 is the part of the side piece 12 that is joined to the surface piece 10 using a hot-melt adhesive or the like, and becomes the erection fulcrum in the longitudinal direction Y of the erected portion 81. In one embodiment, the longitudinal fixing portion 83 includes a ventral fixing portion 83F and a dorsal fixing portion 83R. The ventral fixing portion 83F is formed at a position inside the transverse direction X of the transverse fixing portion 82 and at a position ventral to the center line CL1 in the longitudinal direction Y of the main body portion 2. The ventral fixing portion 83F becomes the erection fulcrum on the ventral side of the erected portion 81. The dorsal fixing portion 83R is formed at a position inside the transverse direction X of the transverse fixing portion 82 and at a position dorsal to the center line CL1 in the longitudinal direction Y of the main body portion 2. The dorsal fixing portion 83R becomes the erection fulcrum on the dorsal side of the erected portion 81.

[0073] The upright portion 81 is positioned inside the transverse fixing portion 82 in the transverse direction X between the ventral fixing portion 83F and the dorsal fixing portion 83R. A telescopic member 13 extending in the longitudinal direction Y is connected to the upright portion 81. By contracting the telescopic member 13 in the longitudinal direction Y, the main body portion 2 deforms in a closed direction. Due to this deformation, the upright portion 81 stands upright between the ventral fixing portion 83F and the dorsal fixing portion 83R, starting from the transverse fixing portion 82. Thus, the upright portion 81 prevents urine leakage by standing upright at the position where the absorbent body 30 is clamped in the transverse direction X.

[0074] like Figure 1As shown, the absorbent article 1 may also include one or more leg-lengthening members 40 capable of stretching and contracting along the longitudinal direction Y. The leg-lengthening members 40 are disposed on the outer side of the stretching member 13 in the transverse direction X. The back end of the leg-lengthening member 40 is disposed in the back region 51, and the ventral end is disposed in the ventral region 53. The leg-lengthening members 40 are made of, for example, a stretchable material such as rubber or spandex capable of contracting and contracting along the longitudinal direction Y, and are disposed along the side edge of the main body 2 between the surface sheet 10 and the back sheet 20. When the absorbent article 1 is worn, the leg-lengthening members 40 contract along the longitudinal direction Y, thereby fitting the side edge of the main body 2 against the wearer's leg circumference. That is, the leg-lengthening members 40 form leg pleats that stretch and contract along the wearer's leg circumference. Furthermore, the absorbent article 1 may also include multiple leg-lengthening members 40. Figure 1 As shown, multiple leg-circumference telescopic components 40 are arranged in the lateral direction X on the outside of the telescopic component 13 and extend parallel to each other in the longitudinal direction Y.

[0075] In one embodiment, when viewed from the skin side Z1, the leg-lengthening members 40 partially overlap with the absorbent body 30. Specifically, when viewed from the skin side Z1, a pair of leg-lengthening members 40 overlap with the dorsal portion 33 of the absorbent body 30.

[0076] The main body 2 also includes an open membrane 55 disposed on the skin-side Z1 relative to the absorber 30. The open membrane 55 functions as a backflow prevention layer to prevent excrement (e.g., urine) absorbed by the absorber 30 from returning to the skin-side Z1. The open membrane 55 is disposed between the surface sheet 10 and the absorber 30. By utilizing the open membrane 55 disposed between the surface sheet 10 and the absorber 30, the backflow of excrement absorbed by the absorber 30 can be effectively suppressed. Figure 6 This is a cross-sectional view showing the periphery of the open membrane 55. For example... Figure 6 As shown, the open membrane 55 is a resin membrane having a plurality of through holes 55a extending in the thickness direction Z. Typically, polyethylene or polypropylene is used as the material for the resin membrane.

[0077] The open membrane 55 has a peripheral portion 55b disposed along the periphery of the through hole 55a on the skin side Z1, a rib 55c protruding from the peripheral portion 55b toward the non-skin side Z2, and a flat portion 55d. The through hole 55a is defined by the peripheral portion 55b and the rib 55c. The flat portion 55d is formed in the open membrane 55 with a substantially constant thickness and is continuously formed with the peripheral portion 55b. The inner surfaces of the peripheral portion 55b and the rib 55c are curved toward the center of the through hole 55a. The through hole 55a is formed such that the opening width continuously narrows toward the non-skin side Z2. Therefore, the opening width w11 of the opening end of the through hole 55a on the non-skin side Z2 is narrower than the opening width w12 of the opening end of the through hole 55a on the skin side Z1. The opening width w11 is equivalent to the minimum opening width of the through hole 55a, and the opening width w12 is equivalent to the maximum opening width of the through hole 55a. In one embodiment, the opening width w11 is the opening width at the end of the rib 55c, and the opening width w12 is the opening width at the base of the peripheral portion 55b (the boundary between the peripheral portion 55b and the flat portion 55d).

[0078] The opening width w11 of the non-skin side Z2 of the through-hole 55a is relatively narrow, which can inhibit urine from passing through the through-hole 55a from the non-skin side Z2 of the opening membrane 55. Therefore, it can further inhibit the backflow of urine absorbed by the absorbent 30.

[0079] The open membrane 55 is positioned on the dorsal side relative to the centerline CL1 in the longitudinal direction Y, and when viewed from the skin side Z1, it overlaps entirely with the absorbent body 30. Since the open membrane 55 is positioned on the dorsal side relative to the centerline CL1 of the main body 2, it can effectively inhibit the backflow of excrement absorbed by the absorbent body 30 to the dorsal side.

[0080] The opening membrane 55 has, for example, a rectangular or square planar shape. The ventral end 55f of the opening membrane 55 is positioned on the dorsal side relative to the centerline CL1 in the longitudinal direction Y. The dorsal end 55r of the opening membrane 55 is positioned ventrally closer to the dorsal end edge 31R of the absorbent body 30. The ventral end 55f of the opening membrane 55 may also be positioned ventrally closer to the dorsal ends of the plurality of grooves 38. The two side edges 55s of the opening membrane 55 in the transverse direction X are positioned inside the transverse direction relative to the transverse fixing portions 82 of the pair of leak-proof pleats 80.

[0081] The open membrane 55 is positioned ventrally relative to the dorsal edge 31R of the absorbent core 31. That is, when viewed from the skin side Z1, a portion of the absorbent core 31 exists between the dorsal edge 31R of the absorbent core 31 and the dorsal end 55r of the open membrane 55. According to this structure, even when urine moves dorsally along the surface of the open membrane 55, the region of the absorbent core 31 including the dorsal edge 31R (this portion of the absorbent core 31) can absorb the urine. Therefore, backflow from the absorbent body 30 can be suppressed while preventing urine leakage. Furthermore, since the groove 38 is positioned ventrally relative to the open membrane 55, the groove 38 can be used to diffuse urine moving ventrally along the surface of the open membrane 55.

[0082] When viewed from the skin side Z1, the dorsal end 55r of the open membrane 55 is positioned to overlap with the dorsal portion 33 of the absorbent core 31. The width w1 of the dorsal portion 33 is the maximum width of the absorbent core 31. That is, the dorsal end 55r of the open membrane 55 is positioned to overlap with the portion of the absorbent core 31 with the largest width in the transverse direction X. According to this structure, even when urine moves along the surface of the open membrane 55 toward the dorsal side, the portion of the absorbent core 31 with the largest width in the transverse direction X (i.e., the dorsal portion 33) can be used to properly absorb urine.

[0083] The open membrane 55 is disposed on the ventral side in the longitudinal direction Y, relative to the dorsal edges of the first hook and loop fastener 90A and the second hook and loop fastener 90B, respectively. In one embodiment, the open membrane 55 is disposed on the ventral side in the longitudinal direction Y, relative to the first hook and loop fastener 90A and the second hook and loop fastener 90B. Therefore, by engaging the first hook and loop fastener 90A and the second hook and loop fastener 90B with the ventral region 53 during wear, the absorbent body 30 can be made to fit snugly against the wearer's body on the dorsal side of the open membrane 55. Thus, even if urine moves along the surface of the open membrane 55 toward the dorsal side, the absorbent body 30 can effectively absorb urine.

[0084] When the pair of leak-proof pleats 80 are not in the upright state, at least a portion of the opening membrane 55 overlaps with the side sheet 12 when viewed from the skin side Z1. As an example, when the pair of leak-proof pleats 80 are not in the upright state, both sides of the opening membrane 55 overlap with the side sheet 12. The two sides of the opening membrane 55 are portions that at least include the two side edges 55s of the opening membrane 55. According to this structure, even when urine moves laterally X along the surface of the opening membrane 55, the urine is blocked by the side sheet 12, thus easily remaining inside the absorbent body 30. Therefore, urine can be effectively absorbed in the absorbent body 30.

[0085] An open membrane 55 is disposed in the longitudinal direction Y between the dorsal fixing portion 83R and the ventral fixing portion 83F. In other words, the open membrane 55 is disposed in the longitudinal direction Y between the dorsal and ventral fulcrums of the upright portion 81. According to this structure, even when urine moves along the surface of the open membrane 55 towards the ventral or dorsal side, the urine is blocked by the ventral or dorsal fulcrum, thus easily remaining inside the absorbent body 30. Therefore, urine can be effectively absorbed within the absorbent body 30.

[0086] Viewed from the skin-facing side Z1, a portion of the opening membrane 55 is positioned between a pair of leg-lengthening members 40, while the remaining portion of the opening membrane 55 is positioned on the back side relative to the pair of leg-lengthening members 40. According to this structure, since the pair of leg-lengthening members 40 are stretched during wear, tension is applied to the main body 2 near the opening membrane 55, thereby stretching the wrinkles created in the main body 2 near the opening membrane 55. Therefore, it is possible to suppress the deterioration of the skin-feel of the absorbent article 1 caused by wrinkles.

[0087] like Figure 4 As shown, when viewed from the skin side Z1, the open membrane 55 is positioned overlapping the high weight-per-unit area region 30h. This prevents urine absorbed by the high weight-per-unit area region 30h from flowing back to the skin side Z1. Alternatively, when viewed from the skin side Z1, the open membrane 55 can be positioned across the boundary Ra between the low weight-per-unit area region 30l and the high weight-per-unit area region 30h. Figure 4 In the example, the boundary Ra corresponds to the dorsal edge of the high unit area weight region 30h. Based on this structure, the backflow of urine absorbed in the low unit area weight region 30l and the high unit area weight region 30h can be suppressed.

[0088] like Figure 6 As shown, the open membrane 55 is bonded to the surface sheet 10 using a hot-melt adhesive H1 coated between the open membrane 10 and the surface sheet 10. The open membrane 55 is bonded to the absorber 30 using a hot-melt adhesive H2 coated between the open membrane 55 and the absorber 30. For example, the hot-melt adhesives H1 and H2 are coated linearly along the longitudinal direction Y. According to this structure, it is possible to prevent the hot-melt adhesives H1 and H2 from clogging the through holes 55a of the open membrane 55.

[0089] The area weight of the hot-melt adhesive H2 coated between the open membrane 55 and the absorbent 30 can be higher than that of the hot-melt adhesive H1 coated between the surface sheet 10 and the open membrane 55. According to this structure, the backflow of urine absorbed by the absorbent 30 can be effectively suppressed using the hot-melt adhesive H2. Therefore, the backflow of urine absorbed by the absorbent 30 can be further suppressed.

[0090] Next, refer to Figure 7 Another embodiment of the absorbent article will be described. Figure 7 This is a plan view of the absorbent article 1A according to another embodiment, viewed from the skin-side Z1. The absorbent article 1A and... Figure 1 The difference between the absorbent article 1 shown is that the guide mark 60 is formed on the open membrane 55. In the following description, the differences from the absorbent article 1 will be mainly explained, and repeated descriptions will be omitted.

[0091] A guide mark 60 is formed on the main body 2 in a manner that allows visual identification from the skin-side Z1. This guide mark 60 is used to guide the placement of a portion of the wearer's body in the longitudinal direction Y. In one embodiment, the guide mark 60 guides the placement of the wearer's buttocks in the longitudinal direction Y. For example, as... Figure 7 As shown, to help the user identify the position where the wearer's buttocks should be positioned, the guide marker 60 has a roughly W-shaped shape that mimics the shape of the buttocks. An open membrane 55 is partially disposed near the guide marker 60.

[0092] A guide mark 60 is disposed on the skin-side Z1 relative to the absorbent body 30. The guide mark 60 is positioned to overlap with the absorbent body 30 when viewed from the skin-side Z1. The guide mark 60 is printed on the open film 55 in a manner that allows it to be visually identified from the skin-side Z1. As an example, the guide mark 60 overlaps the open film 55 entirely when viewed from the skin-side Z1. Thus, when wearing the absorbent article 1A, by placing a portion of the wearer's body on the guide mark 60, the open film 55 can be properly aligned with the wearer's body. As a result, the backflow of excrement absorbed by the absorbent body 30 can be effectively suppressed by utilizing the properly positioned open film 55.

[0093] The guide mark 60 is printed, for example, on the skin-side Z1 or non-skin-side Z2 surface of the opening film 55. The guide mark 60 may have a different color than the opening film 55. For example, if the opening film 55 is colored blue or green, the guide mark 60 may be white. Alternatively, the surface sheet 10, the opening film 55, and the guide mark 60 may be different colors from each other. This improves the visual recognizability of the guide mark 60.

[0094] The guide mark 60 is positioned ventrally relative to the center line CL3 in the longitudinal direction Y of the opening membrane 55. This guides a portion of the wearer's body ventrally relative to the center line CL3 in the longitudinal direction Y of the opening membrane 55. Consequently, the wearer's urine is excreted ventrally towards the opening membrane 55. Therefore, while preventing urine flowing back from the absorbent body 30 from adhering to the wearer's buttocks, the movement of excreted urine towards the absorbent body 30 is prevented from being blocked by the opening membrane 55. Alternatively, a portion of the guide mark 60 may be positioned ventrally relative to the center line CL3 in the longitudinal direction Y of the opening membrane 55, while other portions of the guide mark 60 may be positioned dorsally relative to the center line CL3 in the longitudinal direction Y of the opening membrane 55. In this case, the area of ​​the portion of the guide mark 60 (the portion positioned ventrally relative to the center line CL3) as observed from the skin side Z1 may be larger than the area of ​​the other portions of the guide mark 60 (the portion positioned dorsally relative to the center line CL3) as observed from the skin side Z1.

[0095] Figure 8 This is a magnified image showing the area surrounding the guide mark 60. For example... Figure 8 As shown, the guide mark 60 includes two curved portions 61 that curve smoothly toward the ventral side. Each of the two curved portions 61 has one end 62 and the other end 63, extending in a generally semi-circular arc between the two ends 62 and 63. The ends 62 of the two curved portions 61 are connected to each other at a connecting portion 65. The connecting portion 65 is disposed on the centerline CL2 in the transverse direction X of the main body portion 2. The other ends 63 of the two curved portions 61 are located outside the connecting portion 65 in the transverse direction X. In addition, the other ends 63 of the two curved portions 61 are disposed in the longitudinal direction Y at a position closer to the back side than the connecting portion 65. The other ends 63 of the two curved portions 61 have a rounded outline. Alternatively, the other ends 63 of the two curved portions 61 may have an angular outline. By forming the guide mark 60 with the above-described shape in the main body portion 2, the user of the absorbent article 1A can associate the shape of the guide mark 60 with the shape of the buttocks and identify the buttocks that should be aligned with the guide mark 60.

[0096] Furthermore, the guide mark 60 has a width W4 in the lateral direction X and a width L1 in the longitudinal direction Y. The width W4 of the guide mark 60 in the lateral direction X corresponds to the distance in the lateral direction X between the other ends 63 of the two curved portions 61. When the portion of the two curved portions 61 that protrudes to the ventral side to the maximum extent is set as the lowest point 64, the width L1 of the guide mark 60 in the longitudinal direction Y corresponds to the distance in the longitudinal direction Y between the lowest point 64 and the other ends 63 of the two curved portions 61. The width W4 of the guide mark 60 in the lateral direction X is greater than the width L1 of the guide mark 60 in the longitudinal direction Y. Therefore, the guide mark 60 has a longer transverse shape in the lateral direction X.

[0097] like Figure 7 As shown, three grooves 38 extend in the longitudinal direction Y between the guide mark 60 and the ventral end edge 2F. The width W4 of the guide mark 60 in the transverse direction X is greater than the transverse direction X distance d1 between the two outermost grooves 38 of the three grooves 38 (refer to...). Figure 1 Additionally, the width W4 of the guide mark 60 in the lateral direction X is smaller than the distance d2 between the pair of leak-proof pleats 80 in the non-erect state. Furthermore, the width W4 of the guide mark 60 in the lateral direction X can also be larger than the distance d2 between the pair of leak-proof pleats 80 in the non-erect state. In this case, when the pair of leak-proof pleats 80 are in the non-erect state, the other ends 63 of the two curved portions 61 of the guide mark 60 are covered by the pair of leak-proof pleats 80; when the pair of leak-proof pleats 80 are in the erect state, the guide mark 60, including the other ends 63 of the two curved portions 61 of the guide mark 60, is entirely exposed on the skin side Z1.

[0098] The two curved portions 61 have a substantially constant line width t from one end 62 to the other end 63. The line width t of the two curved portions 61 can be more than 10% and less than 50% of the width W4 in the lateral direction X of the guide mark 60. For example, the line width t of the two curved portions 61 is 2 cm or more. By setting the line width t to 2 cm or more, the visual recognizability of the guide mark 60 can be improved.

[0099] Furthermore, the guide mark 60 may not be formed on the opening membrane 55. In this case, at least a portion of the guide mark 60 is provided such that it overlaps with the opening membrane 55 when viewed from the skin side Z1. For example, the guide mark 60 may be printed on the surface sheet 10 at the position where it overlaps with the opening membrane 55 when viewed from the skin side Z1. The guide mark 60 may also be colored a different color from the surface sheet 10. For example, the guide mark 60 may be printed in blue or green. More specifically, for example, the guide mark 60 may be printed in a color within the range of 5 GY to 10 RP on the Munsell color wheel. Typically, the guide mark 60 is formed such that its entirety overlaps with the opening membrane 55 when viewed from the skin side Z1.

[0100] In one embodiment, the opening membrane 55 may also be colored a different color than the surface sheet 10. By coloring the opening membrane 55, it can be easily visually identified through the surface sheet 10. For example, the opening membrane 55 may be colored blue or green.

[0101] The guide mark 60 can also be a recess or a protrusion formed by embossing the absorbent body 30. For example, the recess or protrusion can be formed on the skin-side Z1 of the absorbent core 31 by embossing. In this case, the user of the absorbent article 1A can not only determine the position of the guide mark 60 by sight, but also by touching the recess or protrusion.

[0102] Figure 9 This is a plan view of the absorbent article 1B according to another embodiment, viewed from the skin side Z1. Figure 9 The absorbent article 1B shown is Figure 1 The difference of the absorbent article 1 shown is that the absorbent article 1B does not have a pair of inserts 16. Instead, a pair of first hook and loop fasteners 90A and a pair of second hook and loop fasteners 90B are attached to a pair of back flap portions 15.

[0103] Figure 10 This is a plan view of the absorbent article 1C according to another embodiment, viewed from the skin side Z1. Figure 10 The absorbent article 1C shown is... Figure 1 The difference in the absorbent article 1 shown is that: the absorbent article 1C does not include a pair of dorsal wing portions 15 and a pair of ventral wing portions 17, and the width of the main body portion 2 in the lateral direction X is constant at all positions in the longitudinal direction Y. For example... Figure 10 As shown, the absorbent article 1C includes a pair of inserts 16 respectively attached to the main body 2. When viewed from the skin-side Z1, the pair of inserts 16 extend outward from the main body 2 in the lateral direction X. The pair of inserts 16 are positioned along the wearer's waistline when worn. Figure 10 As shown, a pair of first hook and loop fasteners 90A and a pair of second hook and loop fasteners 90B are provided on a pair of inserts 16.

[0104] Alternatively, when viewed from the skin side Z1, an opening film 55 may be positioned between a pair of first hook and loop fasteners 90A. Alternatively, when viewed from the skin side Z1, an opening film 55 may be positioned between a pair of second hook and loop fasteners 90B. In this case, during wear, the pair of first hook and loop fasteners 90A and the pair of second hook and loop fasteners 90B are pulled along the wearer's waistline, thus applying lateral tension X to the main body 2 near the opening film 55, thereby stretching the wrinkles created in the main body 2 near the opening film 55. Therefore, it is possible to suppress the deterioration of the skin feel of the absorbent article 1C caused by wrinkles.

[0105] Alternatively, a dividing line 16d may be formed on each pair of inserts 16 to divide each insert 16 in the longitudinal direction Y. The dividing line 16d is, for example, an easy-tear line, formed in the longitudinal direction Y between a pair of first hook and loop fasteners 90A and a pair of second hook and loop fasteners 90B. When each insert 16 is cut along the dividing line 16d, each insert 16 is divided into a ventral part and a dorsal part.

[0106] In one embodiment, when the folded absorbent article 1C is removed from the packaging, a pair of inserts 16 can also be temporarily secured in a folded state along a fold line extending in the longitudinal direction Y. For example, as Figure 11 As shown, with a pair of first hook and loop fasteners 90A and a pair of second hook and loop fasteners 90B folded inward along the side edges of a pair of inserts 16, the pair of inserts 16 are folded inward once or more along one or more fold lines extending in the longitudinal direction Y. Furthermore, the folded pair of inserts 16 are temporarily fixed to the surface sheet 10. Temporary fixing refers to a weak engagement that does not peel off during transport but can be peeled off by force applied by the user during use. For example, temporary fixing is performed using adhesives, embossing, or ultrasonic processing. By temporarily fixing the folded pair of inserts 16 to the surface sheet 10, the pair of inserts 16 are fixed in a folded state during transport.

[0107] Figure 12 This is a plan view of the absorbent article 1D of another embodiment, viewed from the skin side Z1. Figure 12 The absorbent item 1D shown is... Figure 1 The difference of the absorbent article 1 shown is that: the absorbent article 1D does not include a pair of dorsal wing portions 15 and a pair of ventral wing portions 17, the width of the main body portion 2 in the lateral direction X is constant at each position in the longitudinal direction Y, and the absorbent article 1D includes a ventral waist portion 3 and a dorsal waist portion 4.

[0108] The abdominal waistband 3 is joined to the abdominal end of the main body 2, and the back waistband 4 is joined to the back end of the main body 2. In the absorbent article 1D, the main body 2 is folded in half with the abdominal waistband 3 and the back waistband 4 facing each other, and the side end 3a of the abdominal waistband 3 in the transverse direction X and the side end 4a of the back waistband 4 in the transverse direction X are fused together, so that the abdominal waistband 3 and the back waistband 4 are connected in a strip shape. Thus, the absorbent article 1D is formed into an underwear type.

[0109] The abdominal waistband 3 includes: a skin-facing panel 3b disposed on the skin-facing side Z1; a non-skin-facing panel (not shown) disposed on the non-skin-facing side Z2; and a plurality of lateral elastic members 3c. The skin-facing panel 3b and the non-skin-facing panel are joined together using an adhesive such as a heat-sealing adhesive. The plurality of lateral elastic members 3c extend between the side ends 3a in the lateral direction X of the abdominal waistband 3. Therefore, the abdominal waistband 3 stretches and extends in the lateral direction X to conform to the wearer's waist. The lateral elastic members 3c are made of elastic materials such as rubber or spandex.

[0110] The back waistband 4 includes: a skin-facing panel 4b disposed on the skin-facing side Z1; a non-skin-facing panel (not shown) disposed on the non-skin-facing side Z2; and a plurality of lateral elastic members 4c. The skin-facing panel 4b and the non-skin-facing panel are joined together using an adhesive such as a heat-sealing adhesive. The plurality of lateral elastic members 4c extend between the side ends 4a in the lateral direction X of the back waistband 4. Therefore, the back waistband 4 stretches and extends in the lateral direction X to conform to the wearer's waist. The lateral elastic members 4c are made of elastic materials such as rubber or spandex.

[0111] When viewed from the skin-side Z1, at least a portion of the opening membrane 55 can be positioned at a location overlapping with or along the extension line of the transverse elastic member 4c. Because the transverse elastic member 4c elongates during wear, tension in the transverse direction X is applied to the absorbent article 1D near the opening membrane 55, thereby stretching the wrinkles created in the absorbent article 1D near the opening membrane 55. Therefore, it is possible to suppress the deterioration of the skin feel of the absorbent article 1D caused by wrinkles.

[0112] The absorbent articles 1, 1A, 1B, 1C, and 1D of various embodiments have been described above. However, the present invention is not limited to the above embodiments, and various modifications can be made without changing the spirit of the invention. That is, it should be noted that the above embodiments are for illustrative purposes only and do not limit the scope of the present invention.

[0113] For example, in absorbent article 1A, the guide mark 60 has a shape that mimics the shape of a buttocks to guide the wearer to a position where it should be placed. However, the guide mark 60 is not limited to mimicking the shape of a buttocks, as long as it can guide a specific part of the wearer's body in the longitudinal direction. For example, the guide mark 60 could also guide the wearer to a position such as the urinary tract or groin. Figure 13 This is an example of a guide mark 60 used to guide the wearer to the location of their urinary opening. Figure 14 An example of a guide mark 60 indicating the location of the wearer's groin area.

[0114] Furthermore, the shape of the guide marker 60, which guides the wearer to the position of their hips, is not limited to... Figure 8 The example shown. For example, the guide marker 60 can also have, as shown... Figure 15 The patterns, designs, or geometric shapes shown in (a) to (f). Furthermore, the various embodiments described above can be combined without contradiction.

[0115] The invention is described with reference to the following list of items. Furthermore, even without a specific list, the invention may include the following items in any combination.

[0116] [1] An absorbent article, wherein,

[0117] The absorbent article has a main body comprising: a surface sheet disposed on the skin side of the wearer; a back sheet disposed on a non-skin side opposite to the skin side; and an absorbent body disposed between the surface sheet and the back sheet. The main body extends longitudinally between a dorsal edge and a ventral edge.

[0118] The main body also includes a resin-made open membrane disposed between the surface sheet and the absorbent, the open membrane having multiple through holes.

[0119] When the direction from the dorsal end edge to the ventral end edge is defined as ventral and the direction from the ventral end edge to the dorsal end edge is defined as dorsal, the opening membrane is disposed on the dorsal side relative to the center line of the longitudinal direction of the main body, and the end edge of the dorsal side relative to the longitudinal direction of the absorbent is disposed on the ventral side.

[0120] [2] According to the absorbent article described in [1], wherein,

[0121] The main body also includes a pair of leak-proof pleats, which are arranged on the outside of the absorbent body in a transverse direction perpendicular to the longitudinal direction.

[0122] The pair of leak-proof pleats each includes a raised portion, which is capable of standing upright relative to the main body between a back-side raised support point and a front-side raised support point. The back-side raised support point is a raised support point located on the back side relative to the center line of the longitudinal direction of the main body, and the front-side raised support point is a raised support point located on the front side relative to the center line of the longitudinal direction of the main body.

[0123] The open membrane is disposed in the longitudinal direction between the dorsal upright support point and the ventral upright support point.

[0124] [3] The absorbent article according to [1] or [2], wherein,

[0125] The main body has an ventral region that covers the wearer's abdomen and a dorsal region that covers the wearer's back when worn.

[0126] The absorbent article also includes a pair of hook and loop fasteners that extend outward from the dorsal region in a transverse direction perpendicular to the longitudinal direction, and engage with the ventral region from the non-skin side.

[0127] When viewed from the skin side, at least a portion of the opening film is disposed between the pair of hook and loop fasteners.

[0128] [4] The absorbent article according to [1] or [2], wherein,

[0129] The absorbent article also includes a lateral elastic member for providing stretchability in a lateral direction perpendicular to the longitudinal direction to a portion of the absorbent article.

[0130] When viewed from the skin side, at least a portion of the opening membrane is positioned at a location overlapping the lateral elastic member or along the extension line of the lateral elastic member.

[0131] [5] An absorbent article according to any one of [1] to [4], wherein,

[0132] The absorber includes a low weight-per-unit area region and a high weight-per-unit area region disposed at positions offset from each other in the longitudinal direction.

[0133] The absorber has a greater weight per unit area in the high weight per unit area region than the absorber has a greater weight per unit area region.

[0134] When viewed from the skin side, the opening membrane is positioned across the boundary between the low weight-per-unit area region and the high weight-per-unit area region.

[0135] [6] An absorbent article according to any one of [1] to [5], wherein,

[0136] The opening width of the non-skin side opening end of each through hole formed in the open membrane is narrower than the opening width of the skin side opening end of each through hole.

[0137] [7] An absorbent article according to any one of [1] to [6], wherein,

[0138] The main body also includes a pair of upright leak-proof pleats, which are arranged on the outside of the absorbent body in a transverse direction perpendicular to the longitudinal direction.

[0139] The pair of leak-proof pleats each includes side panels covering the two sides of the surface sheet in the lateral direction.

[0140] When the pair of leak-proof pleats are in a non-standing state, at least a portion of the opening membrane overlaps with the side sheet when viewed from the skin side.

[0141] [8] An absorbent article according to any one of [1] to [7], wherein,

[0142] The absorbent comprises: an absorbent core having water-absorbing properties; and a core cladding covering at least the non-skin-facing surface of the absorbent core.

[0143] The absorbent core includes a groove with a lower weight per unit area than other parts of the absorbent core.

[0144] The groove is disposed on the ventral side relative to the opening membrane.

[0145] [9] An absorbent article according to any one of [1] to [8], wherein,

[0146] The absorbent article also includes a pair of leg-circle telescopic members, which are disposed along the two side edges of the main body in a transverse direction perpendicular to the longitudinal direction.

[0147] When viewed from the skin side, the opening membrane is at least partially disposed between the pair of leg-circumference telescopic members.

[0148]

[10] An absorbent article according to any one of [1] to [9], wherein,

[0149] The absorbent body has an absorbent core with water-absorbing properties.

[0150] When viewed from the skin side, the dorsal edge of the open membrane is positioned to overlap with the portion of the absorbent core that is widest in the transverse direction perpendicular to the longitudinal direction.

[0151]

[11] An absorbent article according to any one of [1] to

[10] , wherein,

[0152] At least one of the surface sheet and the open membrane, and the open membrane and the absorber, is coated with a hot melt adhesive in a linear pattern.

[0153]

[12] The absorbent article according to

[11] , wherein,

[0154] The hot melt adhesive is applied in a linear pattern between the surface sheet and the open membrane, and between the open membrane and the absorber.

[0155] The weight per unit area of ​​the hot melt adhesive applied between the open membrane and the absorber is higher than that of the hot melt adhesive applied between the surface sheet and the open membrane.

[0156]

[13] An absorbent article according to any one of [1] to

[12] , wherein,

[0157] The main body has guide marks formed in a manner that allows visual identification from the skin side. These guide marks are used to guide the wearer to specific locations on their body.

[0158] At least a portion of the guide mark is positioned to overlap with the opening membrane when viewed from the skin side.

[0159]

[14] The absorbent article according to

[13] , wherein,

[0160] The guide markers have a shape that mimics the shape of the buttocks in order to guide the wearer to the position of the buttocks.

[0161]

[15] An absorbent article according to any one of [1] to

[14] , wherein,

[0162] The main body has an ventral region that covers the wearer's abdomen and a dorsal region that covers the wearer's back when worn.

[0163] The absorbent article also includes a pair of hook and loop fasteners that extend outward from the dorsal region in a transverse direction perpendicular to the longitudinal direction, and engage with the ventral region from the non-skin side.

[0164] When viewed from the skin side, the absorbent body is located in a portion between the pair of hook and loop fasteners.

[0165] The opening film is disposed on the ventral side in the longitudinal direction relative to the back side of the hook and loop fastener.

[0166] Explanation of reference numerals in the attached figures

[0167] 1. 1A, 1B, 1C, 1D: Absorbent material; 2. Main body; 2F: Ventral edge; 2R, 31R: Dorsal edge; 3c, 4c: Lateral elastic member; 10. Surface sheet; 12. Side sheet; 20. Back sheet; 30. Absorbent body; 30h: High weight-per-unit area area; 30l: Low weight-per-unit area area; 31. Absorbent core; 38. Groove; 40. Leg extension member; 51. 53. Dorsal region; 55. Ventral region; 55. Opening membrane; 55a. Through hole; 60. Guide mark; 80. Leak-proof pleat; 81. Stand-up part; 90A. First hook and loop fastener; 90B. Second hook and loop fastener; CL1. Center line; H1, H2. Hot melt adhesive; Ra. Junction; w11, w12. Opening width; X. Lateral direction; Y. Longitudinal direction; Z1. Skin side; Z2. Non-skin side.

Claims

1. An absorbent article, wherein, The absorbent article has a main body comprising: a surface sheet disposed on the skin side of the wearer; a back sheet disposed on a non-skin side opposite to the skin side; and an absorbent body disposed between the surface sheet and the back sheet. The main body extends longitudinally between a dorsal edge and a ventral edge. The main body also includes a resin-made open membrane disposed between the surface sheet and the absorbent, the open membrane having multiple through holes. When the direction from the dorsal end edge to the ventral end edge is defined as ventral and the direction from the ventral end edge to the dorsal end edge is defined as dorsal, the opening membrane is disposed on the dorsal side relative to the center line of the longitudinal direction of the main body, and the end edge of the dorsal side relative to the longitudinal direction of the absorbent is disposed on the ventral side.

2. The absorbent article according to claim 1, wherein, The main body also includes a pair of leak-proof pleats, which are arranged on the outside of the absorbent body in a transverse direction perpendicular to the longitudinal direction. The pair of leak-proof pleats each includes a raised portion, which is capable of standing upright relative to the main body between a back-side raised support point and a front-side raised support point. The back-side raised support point is a raised support point located on the back side relative to the center line of the longitudinal direction of the main body, and the front-side raised support point is a raised support point located on the front side relative to the center line of the longitudinal direction of the main body. The open membrane is disposed in the longitudinal direction between the dorsal upright support point and the ventral upright support point.

3. The absorbent article according to claim 1, wherein, The main body has an ventral region that covers the wearer's abdomen and a dorsal region that covers the wearer's back when worn. The absorbent article also includes a pair of hook and loop fasteners that extend outward from the dorsal region in a transverse direction perpendicular to the longitudinal direction, and engage with the ventral region from the non-skin side. When viewed from the skin side, at least a portion of the opening film is disposed between the pair of hook and loop fasteners.

4. The absorbent article according to claim 1, wherein, The absorbent article also includes a lateral elastic member for providing stretchability in a lateral direction perpendicular to the longitudinal direction to a portion of the absorbent article. When viewed from the skin side, at least a portion of the opening membrane is positioned at a location overlapping the lateral elastic member or along the extension line of the lateral elastic member.

5. The absorbent article according to claim 1, wherein, The absorber includes a low weight-per-unit area region and a high weight-per-unit area region disposed at positions offset from each other in the longitudinal direction. The absorber has a greater weight per unit area in the high weight per unit area region than the absorber has a greater weight per unit area region. When viewed from the skin side, the opening membrane is positioned across the boundary between the low weight-per-unit area region and the high weight-per-unit area region.

6. The absorbent article according to claim 1, wherein, The opening width of the non-skin side opening end of each through hole formed in the open membrane is narrower than the opening width of the skin side opening end of each through hole.

7. The absorbent article according to claim 1, wherein, The main body also includes a pair of upright leak-proof pleats, which are arranged on the outside of the absorbent body in a transverse direction perpendicular to the longitudinal direction. The pair of leak-proof pleats each includes side panels covering the two sides of the surface sheet in the lateral direction. When the pair of leak-proof pleats are in a non-standing state, at least a portion of the opening membrane overlaps with the side sheet when viewed from the skin side.

8. The absorbent article according to claim 1, wherein, The absorbent comprises: an absorbent core having water-absorbing properties; and a core cladding covering at least the non-skin-facing surface of the absorbent core. The absorbent core includes a groove with a lower weight per unit area than other parts of the absorbent core. The groove is disposed on the ventral side relative to the opening membrane.

9. The absorbent article according to claim 1, wherein, The absorbent article also includes a pair of leg-circle telescopic members, which are disposed along the two side edges of the main body in a transverse direction perpendicular to the longitudinal direction. When viewed from the skin side, the opening membrane is at least partially disposed between the pair of leg-circumference telescopic members.

10. The absorbent article according to claim 1, wherein, The absorbent body has an absorbent core with water-absorbing properties. When viewed from the skin side, the dorsal edge of the open membrane is positioned to overlap with the portion of the absorbent core that is widest in the transverse direction perpendicular to the longitudinal direction.

11. The absorbent article according to claim 1, wherein, At least one of the surface sheet and the open membrane, and the open membrane and the absorber, is coated with a hot melt adhesive in a linear pattern.

12. The absorbent article according to claim 11, wherein, The hot melt adhesive is applied in a linear pattern between the surface sheet and the open membrane, and between the open membrane and the absorber. The weight per unit area of ​​the hot melt adhesive applied between the open membrane and the absorber is higher than that of the hot melt adhesive applied between the surface sheet and the open membrane.

13. The absorbent article according to claim 1, wherein, The main body has guide marks formed in a manner that allows visual identification from the skin side. These guide marks are used to guide the wearer to specific locations on their body. At least a portion of the guide mark is positioned to overlap with the opening membrane when viewed from the skin side.

14. The absorbent article according to claim 13, wherein, The guide markers have a shape that mimics the shape of the buttocks in order to guide the wearer to the position of the buttocks.

15. The absorbent article according to claim 1, wherein, The main body has an ventral region that covers the wearer's abdomen and a dorsal region that covers the wearer's back when worn. The absorbent article also includes a pair of hook and loop fasteners that extend outward from the dorsal region in a transverse direction perpendicular to the longitudinal direction, and engage with the ventral region from the non-skin side. When viewed from the skin side, the absorbent body is located in a portion between the pair of hook and loop fasteners. The opening film is disposed on the ventral side in the longitudinal direction relative to the back side of the hook and loop fastener.

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