Absorbent articles

Abstract

To provide an absorbent article that strikes a balance between improvement in prevention of lateral leakage of body fluid and reduction in discomfort feeling during wearing.SOLUTION: An absorbent article 1 includes: an absorbent body 2 having a longitudinal direction X and a width direction Y and including a front face sheet 3, a rear face sheet 4 and an absorber 5; and a leakage prevention cuff 8. The leakage prevention cuff 8 includes: a nonwoven fabric 80; an elastic member 83 disposed between the nonwoven fabrics 80 while extending in the longitudinal direction X; and a liquid impermeable sheet 85 disposed between the nonwoven fabrics 80. The leakage prevention cuff 8 includes a proximal end part and a free end part and has a part where the liquid impermeable sheet 85 is absent in an end region including a free end 8e. The elastic member 83 overlapping on the liquid impermeable sheet 85 is positioned only on one face side of the liquid impermeable sheet 85 in plan view of the free end part. A junction part 89 joining the nonwoven fabric 80 to the liquid impermeable sheet 85 is positioned on a side of the proximal end part 81 as compared with a position of the elastic member 83 that is positioned only on the other surface side of the liquid impermeable sheet 85 and nearest to the proximal end part 81.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to an absorbent article. [Background technology]

[0002] An absorbent article typically includes an absorbent body mainly made of a water-absorbent material such as pulp or a water-absorbent polymer, and leak-proof cuffs. The present applicant has proposed an absorbent article having an absorbent main body including an absorbent core, inner three-dimensional gathered portions arranged on both sides of the absorbent main body, and outer three-dimensional gathered portions located widthwise outward of the inner three-dimensional gathered portions, in which a water-repellent film is continuously arranged from the non-skin contacting surface side of the absorbent core to each gathered portion (see Patent Document 1).

[0003] Patent Document 2 discloses a disposable diaper in which no waterproof resin film is provided in the portion of the three-dimensional gathers above the surface of the inner body, nor between the three-dimensional gathers and the portion from the upper surface of the side portion of the absorbent body to the side, and which is provided with a water-repellent nonwoven fabric inside the three-dimensional gathers that covers the side portion of the absorbent body from the surface to the back surface.

[0004] Patent Document 3 discloses a disposable diaper in which the portion of the leg gathers closer to the base end than the tip end has a nonwoven fabric-free portion where there is no inner nonwoven fabric layer and the liquid-impermeable film is exposed only between the gathered elastic stretch members. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2013-252323 A [Patent Document 2] JP 2013-111356 A [Patent Document 3] JP 2016-193225 A Summary of the Invention [Problem to be solved by the invention]

[0006] The absorbent article described in Patent Document 1 has good side leakage prevention performance and leak prevention, but there is room for improvement in terms of reducing the discomfort felt in the legs due to the stiffness of the gathers. Also, the absorbent articles described in Patent Documents 2 and 3 have difficulty in achieving both improved leak prevention and reduced discomfort.

[0007] Therefore, the present invention relates to providing an absorbent article which achieves both improved prevention of side leakage of bodily fluids and reduced discomfort when worn. [Means for solving the problem]

[0008] The present invention provides an absorbent article having a longitudinal direction corresponding to the front-rear direction of a wearer and a width direction perpendicular to the longitudinal direction, the absorbent body including a top sheet, a back sheet, and an absorbent body, and leak-proof cuffs extending in the longitudinal direction, The leak-proof cuffs each include a pair of opposing nonwoven fabrics, a plurality of elastic members disposed between the nonwoven fabrics so as to extend in the longitudinal direction, and a liquid-impermeable sheet disposed between the nonwoven fabrics, The leak-proof cuff has a proximal end serving as an upright end and a free end, the free end portion has an end region including the free end portion where the liquid-impermeable sheet is not present, In a plan view of the free end portion, at least one of the elastic members overlaps with the liquid-impermeable sheet, In a plan view of the free end portion, all of the elastic members overlapping the liquid-impermeable sheet are located only on one surface side of the liquid-impermeable sheet, a joint portion for joining the nonwoven fabric and the liquid-impermeable sheet is formed between the base end portion and the free end portion of the leakage-preventing cuff, The present invention provides an absorbent article in which the joint is located only on the other side of the liquid-impermeable sheet and is located closer to the base end than the position of the elastic member that is located closest to the base end. Effect of the Invention

[0009] According to the present invention, there is provided an absorbent article which achieves both improved prevention of side leakage of bodily fluids and reduced discomfort when worn. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view showing a typical relaxed state of a pants-type disposable diaper which is one embodiment of the absorbent article of the present invention. [Diagram 2] FIG. 2 is a developed plan view that shows a schematic view of the skin-facing side (top sheet side) of the absorbent article shown in FIG. 1 in an unfolded and maximally stretched state. [Diagram 3] FIG. 3 is a cross-sectional view that typically shows a cross section taken along line II of the absorbent article shown in FIG. [Figure 4] FIG. 4 is a cross-sectional view that typically shows a cross section taken along line II of the absorbent article shown in FIG. 2 in a relaxed state. [Diagram 5] FIG. 5 is a cross-sectional view showing a schematic diagram of an embodiment of the positions of the elastic members and the liquid-impermeable sheet when the leakage-proof cuff is in the maximum extended state. [Figure 6] Figure 6(a) is a cross-sectional view showing a schematic representation of one embodiment of the positioning of the elastic member and the liquid-impermeable sheet of the leakproof cuff when a folded portion is formed, and Figure 6(b) is a cross-sectional view showing a schematic representation of one embodiment of the positioning of the elastic member and the liquid-impermeable sheet of the leakproof cuff when a folded portion is not formed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described based on preferred embodiments with reference to the drawings. Figures 1 to 4 show one embodiment of a pants-type disposable diaper which is a preferred embodiment of the absorbent article of the present invention.

[0012] As shown in Figs. 1 and 2, a pants-type disposable diaper (hereinafter, simply referred to as "diaper") 1 as an absorbent article has a ventral region F arranged on the ventral side of a wearer when the diaper is worn, a dorsal region R arranged on the dorsal side, and a crotch region M located between the ventral region F and the dorsal region R. The diaper 1 has a longitudinal direction X extending from the ventral side of the wearer through the crotch region to the dorsal side corresponding to the front-rear direction of the wearer, and a width direction Y perpendicular thereto. The ventral region F, the crotch region M, and the dorsal region R extend continuously along the longitudinal direction X, which is the front-rear direction of the wearer. The crotch region M has an excretory part facing portion (not shown) that is arranged facing the excretory part of the wearer when the diaper 1 is worn.

[0013] In this specification, the "skin-facing side" refers to the side of the absorbent article or its constituent member (e.g., absorbent body) that faces the wearer's skin when the absorbent article is worn, i.e., the side relatively close to the wearer's skin, and the "non-skin-facing side" refers to the side of the absorbent article or its constituent member that faces the opposite side to the skin when the absorbent article is worn, i.e., the side relatively far from the wearer's skin. Note that "when worn" here refers to the normal, appropriate wearing position, i.e., a state in which the absorbent article is maintained in the correct wearing position.

[0014] As shown in Figs. 1 and 2, the diaper 1 includes an absorbent body 2 capable of absorbing and retaining excrement, and an exterior body 10 disposed on the non-skin-facing side of the absorbent body 2. The exterior body 10 is a member that forms the outer shape of the diaper 1. The periphery of the exterior body 10 forms the contour lines of the ventral region F and the back region R of the diaper 1, respectively. The exterior body 10 includes a ventral exterior body 10F that extends in the width direction Y and is disposed in the ventral region F, and a back exterior body 10R that is separate from the ventral exterior body 10F and extends in the width direction Y and is disposed in the back region R. That is, the diaper 1 in this embodiment is a pants-type disposable diaper known as a split type. The absorbent body 2 extends in the longitudinal direction X over the entire area from the ventral region F to the back region R, and is disposed so as to bridge between the ventral exterior body 10F and the back exterior body 10R that are disposed at a predetermined interval in the longitudinal direction X. Alternatively to this embodiment, the exterior body 10 may be disposed continuously over the entire areas of the abdominal region F, the crotch region M and the rear region R on the outer surface of the diaper 1.

[0015] The diaper 1 has a pair of side seals S, S formed by joining both sides in the width direction Y of the ventral exterior body 10F and both sides in the width direction Y of the rear exterior body 10R together. This connects the exterior bodies 10F, 10R in a ring shape. The diaper 1 also has a waist opening WH through which the wearer's torso passes, and a pair of leg openings LH through which the wearer's lower legs pass. The side seals S are formed by a joining method such as adhesive, heat sealing, ultrasonic sealing, etc.

[0016] In this specification, the "maximum stretched state" of the absorbent article or diaper 1 refers to a state in which the diaper 1 is separated at the side seal portion S to be laid out, and the elastic members of the diaper 1 in the laid-out state are stretched to their maximum extent to be the same as the designed dimensions, i.e., the dimensions when laid out flat in a state completely free of the influence of the elastic members. The "relaxed state" of the absorbent article (diaper 1) refers to a state in which the absorbent article is not stretched without applying an external force to the elastic members arranged in the absorbent article.

[0017] The absorbent body 2 is configured to include a liquid-permeable top sheet 3 arranged relatively close to the wearer's skin, a liquid-impermeable or poorly liquid-permeable (hereinafter, these are also collectively referred to as "liquid-resistant") or water-repellent back sheet 4 arranged relatively far from the wearer's skin, and an absorbent body 5 interposed and disposed between the two sheets 3, 4. These members that make up the absorbent body 2 are integrated together by a known joining method such as an adhesive.

[0018] The top sheet and the back sheet can be any sheet that has been conventionally used in absorbent articles such as disposable diapers, without any particular restrictions. For example, the top sheet can be made of various nonwoven fabrics. The back sheet can be made of liquid-resistant or water-repellent nonwoven fabrics, resin films, and laminates of resin films and nonwoven fabrics. The core wrap sheet can be made of the same material as the top sheet. The sheet for forming the leak-proof cuffs can be made of the same material as the back sheet.

[0019] As shown in Figures 3 and 4, the top sheet 3 traverses the skin-facing side of the absorbent body 5 in the width direction Y, and extensions 3E from both side edges of the top sheet 3 along the longitudinal direction X of the absorbent body 5 are wrapped around the non-skin-facing side of the absorbent body 5.

[0020] In this embodiment, the pair of extensions 3E, 3E of the topsheet 3 are fixed between the absorbent body 5 and a nonwoven fabric (sheet for forming leakproof cuffs) 80, which will be described later, at base ends 81 of the leakproof cuffs 8, which will be described later. The topsheet 3 does not cover the entire non-skin facing surface of the absorbent body 5, and the central portion in the width direction Y of the non-skin facing surface of the absorbent body 5 (the portion located between the pair of base ends 81, 81) is not covered by the topsheet 3.

[0021] In this embodiment, the topsheet 3 has a size sufficient to cover the entire skin-facing surface of the absorbent body 5, covers the entire skin-facing surface of the absorbent body 5 and both side edges along the longitudinal direction X of the absorbent body 5, and further covers a predetermined area inward in the width direction Y from both side edges on the non-skin-facing surface of the absorbent body 5. The topsheet 3 in this embodiment is a flat sheet with no unevenness, but instead, a sheet having an uneven surface formed with a plurality of convex portions and concave portions located around the convex portions may be used.

[0022] The absorbent body 5 typically includes an absorbent core 6 having a single-layer or laminated structure, and a core wrap sheet (not shown) that covers the absorbent core 6. The absorbent body 5 is disposed at least in the crotch region M, and is disposed continuously in at least one of the abdominal region F and the back region R in addition to the crotch region M. In this embodiment, as shown in Fig. 2, the absorbent body 5 has a rectangular shape in a plan view, and is disposed throughout the abdominal region F, the crotch region M, and the back region R with the longitudinal direction of the absorbent body 5 coinciding with the longitudinal direction X of the diaper 1.

[0023] The absorbent core 6 is composed of at least one of the following: a stack of absorbent natural fibers such as pulp fibers, a mixed stack containing absorbent natural fibers and absorbent polymers, and / or an absorbent sheet having two identical or different fiber sheets and particles of absorbent polymers arranged between the fiber sheets. When the absorbent core is composed of both the stack and the absorbent sheet, their sizes in a plan view may be the same or different. The core wrap sheet is made of tissue paper or a water-permeable nonwoven fabric. The core wrap sheet preferably covers the entire skin-facing side and non-skin-facing side of the absorbent core.

[0024] The diaper 1 of this embodiment is provided with a pair of leakage preventing cuffs 8, 8 on both sides of the absorbent main body 2 along the longitudinal direction X. The leakage preventing cuffs 8 extend in the longitudinal direction X and are configured to be stretchable in the longitudinal direction X.

[0025] Each leakproof cuff 8 is independently configured to include a pair of liquid-resistant or water-repellent and breathable leakproof cuff-forming sheets 80. In this embodiment, the leakproof cuff 8 is formed by a single sheet 80 for forming leakproof cuffs that is folded in half along the longitudinal direction X and faces each other. Each leakproof cuff 8 extends along the longitudinal direction X and is continuously disposed along a side portion of the absorbent main body 2 along the longitudinal direction X, over substantially the entire length of the absorbent main body 2 in the longitudinal direction X.

[0026] As the leak-proof cuff forming sheet 80, any material such as nonwoven fabric that is used as a leak-proof cuff material in this type of absorbent article can be used without any particular restrictions, for example, a single-layer or multi-layer water-repellent nonwoven fabric, a laminate material of a resin film and a nonwoven fabric, etc. can be used.

[0027] The leakproof cuff 8 has a base end 81 where the leakproof cuff-forming sheet 80 is fixed to another member, and an upright portion 82 where the sheet 80 stands on the wearer side. The upright portion 82 is a free end of the leakproof cuff 8, and is a portion of the leakproof cuff-forming sheet 80 that is not fixed to another member. The upright portion 82 is present at least in the crotch region M, and preferably is present continuously in the abdominal region F, the crotch region M, and the dorsal region R.

[0028] The base end 81 is a portion that becomes the rising end when the standing portions 82 rise toward the wearer's skin when the diaper 1 is worn, and is a portion where the leakage preventing cuff-forming sheet 80, such as a nonwoven fabric, is fixed to another member, specifically, a constituent member of the absorbent main body 2 and / or the exterior body 10, by a known fixing method such as an adhesive such as hot melt or heat fusion. The base end 81 extends continuously or discontinuously in the longitudinal direction X over substantially the entire length of the leakage preventing cuff-forming sheet 80 in the longitudinal direction X. The base end 81 is located on the non-skin-facing side of the absorbent body 5.

[0029] The standing portion 82 extends in the longitudinal direction X and is configured to be expandable and contractible in the longitudinal direction X. In this embodiment, as shown in Fig. 3, a plurality of leak-preventing cuff-forming elastic members 83 are arranged to extend along the longitudinal direction X on the side close to the free end 8e of the standing portion 82. Each elastic member 83 is, for example, folded in half along the longitudinal direction X and fixed in a stretched state between a pair of leak-preventing cuff-forming sheets 80, 80 facing each other by a fixing method such as adhesive. Each elastic member 83 is independently arranged at least in the crotch region M. In this embodiment, each elastic member 83 has both ends independently extending to both ends of the leak-preventing cuff 8 in the longitudinal direction X, and is continuously arranged in the abdominal region F, the crotch region M, and the back region R. As a result, a region having elasticity in the longitudinal direction X is formed in the leak-preventing cuff 8 at least in the free end where the elastic member 83 is arranged.

[0030] When multiple elastic members are arranged in the leakage-proof cuff 8 as described above, the elastic members 83 for forming the leakage-proof cuff are defined in this specification as elastic members that are present in an area within 10 mm in the width direction Y as seen from the free end 8e when the free end of the leakage-proof cuff 8 is viewed in a plane in the maximum stretched state of the diaper, and that are arranged so that the distance between adjacent elastic members in the width direction Y is 8 mm or less.

[0031] As shown in Fig. 4, the leakage preventing cuffs 8 are preferably folded outward in the width direction Y at folding portions 8f extending along the longitudinal direction X between the base end portions 81 and the free ends 8e of the standing portions 82, and divided into a lower region 8b located on the base end portion 81 side and an upper region 8u located on the free end side of the standing portions 82. As a result, the free ends of the leakage preventing cuffs 8, including the free ends 8e of the standing portions 82, are formed to protrude outward in the width direction Y when the absorbent article is in a relaxed state. In addition, the elastic members 83 are disposed in the outwardly protruding portions of the upper regions 8u. With this configuration, the upper regions 8u can be brought into surface contact with the wearer's skin, thereby reducing leakage of bodily fluids beyond the leakage preventing cuffs 8 to the outside of the diaper.

[0032] 4, at least in the crotch region M, the leakage preventing cuffs 8 are folded at the folding portions 8f such that the folding portions 8f are located inward in the width direction Y of the free ends 8e of the standing portions 82. Therefore, when the diaper 1 is in a relaxed state, the leakage preventing cuffs 8 are bent at the folding portions 8f, and the free ends of the standing portions 82 protrude outward. The lower region 8b and the upper region 8u both extend along the longitudinal direction X, and are both substantially rectangular in plan view.

[0033] 2, it is preferable that at both ends in the longitudinal direction X of the leakage preventing cuffs 8, there are formed upright inhibition parts 88, which are parts where the uprighting of the leakage preventing cuff-forming sheet 80 is inhibited. A pair of upright inhibition parts 88 are formed in each of the ventral region F and the dorsal region R, and the part along the longitudinal direction X sandwiched between the upright inhibition parts 88, 88 is the upright part 82. The upright inhibition parts 88 are typically formed by fixing the leakage preventing cuff-forming sheet 80 to the skin-facing surface (top sheet 3) of the absorbent main body 2.

[0034] A pair of standing inhibition parts 88 are formed at both ends of the leakage preventing cuff 8 in the longitudinal direction X, so that when the diaper 1 is worn, a standing part 82, which is a part sandwiched between the standing inhibition parts, stands with the base end 81 as the standing end toward the wearer's skin side due to the contractile force of the leakage preventing cuff forming elastic member 83. In such an upright state of the leakage preventing cuff 8, the standing part 82 blocks the outward movement of bodily fluids such as urine excreted by the wearer in the width direction Y, so that side leakage, particularly in the crotch region M, is effectively suppressed. Furthermore, although not shown, when the leakproof cuffs 8 are in the upright state, the contractile force of the leakproof cuff-forming elastic members 83 causes the entire diaper 1 to curve and deform so that the central portion of the absorbent body 2 in the longitudinal direction X becomes convex toward the non-skin-facing side (the back sheet 4 side), making it easier for the diaper 1 to fit the wearer's body shape.

[0035] The leakage-preventing cuff 8 preferably further includes a liquid-impermeable sheet 85 in addition to the leakage-preventing cuff-forming sheet 80. This prevents sideways leakage of bodily fluids and allows the absorbent body to efficiently absorb the bodily fluids. The liquid-impermeable sheet 85 may be, for example, a fiber sheet such as a liquid-resistant or water-repellent and breathable nonwoven fabric similar to the leakage-preventing cuff-forming sheet 80, or a resin film. The liquid-impermeable sheet 85 is joined to the leakage-preventing cuff-forming sheet 80 via a joining portion 89 formed by a fixing method such as an adhesive. When the leakage-preventing cuff 8 is viewed in cross section along the width direction Y, one or more joining portions 89 are formed between the base end portion 81 and the free end 8e of the leakage-preventing cuff 8.

[0036] In the present embodiment, at least a part of the liquid-impermeable sheet 85 is preferably disposed between the sheets 80 for forming the leakage-prevention cuffs, such as nonwoven fabrics, in the leakage-prevention cuffs 8, and it is more preferable that the entire liquid-impermeable sheet 85 is disposed between the sheets 80 for forming the leakage-prevention cuffs, such as nonwoven fabrics, in the leakage-prevention cuffs 8. The liquid-impermeable sheet 85 is disposed at least in the crotch region M, and, similarly to the leakage-prevention cuffs 8, it is also preferable that the liquid-impermeable sheet 85 extends to both ends in the longitudinal direction X and is disposed continuously in the abdominal region F, the crotch region M, and the dorsal region R. This configuration can further improve prevention of lateral leakage of bodily fluids while reducing discomfort caused by the liquid-impermeable sheet 85 coming into direct contact with the wearer's skin.

[0037] An embodiment of the positions of the elastic member 83 and the liquid-impermeable sheet 85 in the leakage preventing cuff 8 is shown in Fig. 5 and Figs. 6(a) and (b). Fig. 5 shows an example of the positions of the elastic member 83 and the liquid-impermeable sheet 85 in the leakage preventing cuff 8 when it is in the maximum extended state. Fig. 6(a) shows an example of the positions of the elastic member 83 and the liquid-impermeable sheet 85 in the leakage preventing cuff 8 when the folded portion 8f is formed. Fig. 6(b) shows an example of the positions of the elastic member 83 and the liquid-impermeable sheet 85 in the leakage preventing cuff 8 when the folded portion 8f is not formed.

[0038] As shown in Figures 5 and 6(a) and (b), it is preferable that the free end of the leak-proof cuff 8 has a portion where the liquid-impermeable sheet 85 is not present, and it is more preferable that the end region including the free end 8e at the free end has a portion where the liquid-impermeable sheet 85 is not present. In this embodiment, the end 8g located on the free end 8e side of the liquid-impermeable sheet 85 is arranged not to reach the free end 8e of the leakage preventing cuff 8, thereby forming a portion where the liquid-impermeable sheet 85 is not present in the end region including the free end 8e of the leakage preventing cuff 8. The end region including the free end 8e of the leakage preventing cuff 8 is formed at least in the crotch region M, has a predetermined width from the free end 8e toward the base end 81, and extends in the longitudinal direction X. Since the free end of the leak-proof cuff 8 is the part that is likely to come into contact with the wearer's skin, this configuration further increases the flexibility of the end region including the free end 8e of the leak-proof cuff 8, thereby reducing the discomfort felt when wearing the absorbent article.

[0039] From the viewpoint of improving the flexibility of the leakage preventing cuffs, the distance D1 (see FIG. 5) along the width direction Y between the free end 8e of the leakage preventing cuff 8 and the end 8g located on the side of the free end 8e of the liquid-impermeable sheet 85 is preferably 1 mm or more, more preferably 3 mm or more, and preferably 30 mm or less, more preferably 20 mm or less. The distance D1 can be regarded as the width of the end region including the free end 8e of the leakage preventing cuff 8. The distance D1 is the dimension along the width direction Y based on a plan view of the free end of the leakage preventing cuff 8 when the diaper is in the maximum stretched state.

[0040] Regarding the positions of the elastic members 83 and the liquid-impermeable sheet 85, as shown in Fig. 5 and Fig. 6(a) and (b), in a plan view of the free end of the leakage-preventing cuff 8, it is preferable that at least one of the elastic members 83 overlaps the liquid-impermeable sheet 85. Moreover, it is preferable that all of the elastic members 83 arranged to overlap the liquid-impermeable sheet 85 are arranged only on one side of the liquid-impermeable sheet 85, and it is more preferable that they are arranged only on the skin-facing surface SS of the liquid-impermeable sheet 85. With this configuration, the contractile force of the elastic members can easily bring the leakage-preventing cuff 8 into close contact with the wearer's skin, which results in an improved fit of the diaper and reduced leakage of bodily fluids.

[0041] Although not shown for ease of explanation, as described above, the elastic members 83 are at least joined to the leakage-preventive cuff-forming sheet 80 by a fixing method such as an adhesive. When the elastic members 83 are joined by an adhesive or the like, the joint formed thereby is not included in the joint 89 described below, even if it indirectly joins the leakage-preventive cuff-forming sheet 80 and the liquid-impermeable sheet 85. The joint of the elastic member 83 is a joint that overlaps with the elastic member 83 in a plan view of the leakage-preventive cuff or is located within 0.5 mm from the elastic member 83 in the width direction Y. Any other joint is distinguished as a joint 89 that joins the leakage-preventive cuff-forming sheet 80 and the liquid-impermeable sheet 85.

[0042] In addition, in a plan view of the free end of the leakage-preventive cuff 8, the joints 89 joining the leakage-preventive cuff-forming sheet 80 and the liquid-impermeable sheet 85 are preferably formed so as to be located only on the other side of the liquid-impermeable sheet 85, which is the side on which the elastic members 83 are not present, and more preferably arranged so as to be located only on the non-skin-facing surface NS side of the liquid-impermeable sheet 85. In addition, it is also preferable that the joints 89 are formed so as to be located closer to the base end 81 than the elastic member 83 located farthest from the free end 8e, i.e., the position 8A of the elastic member 83 located closest to the base end 81. The joints 89 are typically formed with an adhesive. In addition, it is more preferable that the configuration related to the joints 89 described above is satisfied in all of the joints 89 (see FIG. 5). With this configuration, the joint 89, which is a portion having higher rigidity than other portions, is less likely to come into contact with the wearer, so the stiffness of the leakproof cuff can be reduced, and the discomfort felt when worn is reduced. In addition, since the joint 89 is formed only on the other surface of the liquid-impermeable sheet 85, there is also the advantage that the manufacturing cost for forming the joint 89 is reduced.

[0043] As described above, the joint 89 is located closer to the base end 81 than the position 8A of the elastic member 83 that is closest to the base end 81. It is also preferable that the joint 89 located closer to the free end 8e than the position 8A of the elastic member has an area smaller than a predetermined area, or that the joint 89 does not exist on the free end 8e side.

[0044] In detail, when the free end of the leakage preventing cuff 8 in the maximum stretched state of the diaper is viewed in plan, the area between the two uprighting inhibiting parts 88, 88 from the free end 8e to the position of the elastic member 83 located closest to the base end 81 is defined as area A1, and the area of ​​the joint 89 located closer to the free end 8e than the position of the elastic member 83 located closest to the base end 81 is defined as area A2. In this case, the ratio (A2 / A1) of the area A2 to the area A1 is preferably 2% or less, more preferably 0.5% or less, and even more preferably 0%, expressed as a percentage. In other words, it is more preferable that the joint 89 does not exist on the free end 8e side of the position 8A. With such a configuration, the stiffness of the leakage preventing cuff can be effectively reduced, and the discomfort felt when worn is further effectively reduced.

[0045] In order to set the A2 / A1 ratio within the above range, for example, adhesive can be applied in a spiral shape to the leakage preventing cuff-forming sheet 80 to form many areas where the adhesive is not applied when forming the joints 89. Alternatively, adhesive can be applied to the entire predetermined area of ​​the leakage preventing cuff-forming sheet 80, and the intended positions of the elastic members 83 can be controlled to be areas where the adhesive is not applied.

[0046] The area A1, the area A2 and the A2 / A1 ratio can be measured, for example, by the following method. First, in a plan view of the free end of the leakage-preventing cuff 8 when the diaper is in the maximum stretched state, a length Ay in the width direction Y between the free end 8e and the position of the elastic member 83 located closest to the base end 81 is measured. The length Ax in the longitudinal direction X can be any length provided that it includes the area where the joint 89 is formed, and can be, for example, 200 mm. The area A1 is calculated from the product of the length Ax and the length Ay. These lengths may be measured from an image of the area to be measured using image processing software. In addition, for area A2, the formation site of joint 89 is visualized using ink toner or the like for the region in which area A1 was calculated, and in this state, the total area of ​​joint 89 is measured using image processing software, and this is designated as area A2. Then, the A2 / A1 ratio is calculated from these areas A1 and A2.

[0047] When the leakage preventing cuff 8 is folded outward in the width direction Y at the folding portion 8f and divided into a lower region 8b located on the base end 81 side and an upper region 8u located on the free end side of the standing portion 82, it is preferable to arrange each elastic member 83 so that the thickness of the elastic member 83 arranged closest to the free end 8e of the leakage preventing cuff 8 is thinner than the thickness of the elastic member 83 arranged closest to the folding portion 8f, i.e., the elastic member 83 arranged closest to the base end 81. When three or more elastic members 83 are arranged, the thickness of each elastic member 83 may be gradually increased from the outside to the inside in the width direction Y as viewed from the free end 8e. Alternatively, the elastic member 83 arranged closest to the base end 81 may be the thickest, and the other elastic members 83 may be the same thickness. By using the elastic member 83 in such a position, it is easy to form an appropriate gap between the free end of the leakproof cuff 8 and the wearer's skin, reducing the discomfort felt when worn, and it is possible to ensure sufficient elongation stress on the base end 81 side of the leakproof cuff 8, further improving the adhesion to the wearer's skin and more effectively preventing lateral leakage of excrement.

[0048] The thickness of each elastic member 83 mentioned above refers to the thickness of each elastic member in a non-stretched state. When each elastic member 83 is thread-like, the diameter of the cross section of each elastic member 83 is measured at three different points for each elastic member 83, and is expressed as the arithmetic average value. When each elastic member 83 is strip-like, the thickness of each elastic member 83 is measured at three different points for each elastic member 83 in a direction perpendicular to the stretching direction on the main surface of the elastic member, and is expressed as the arithmetic average value. When each elastic member 83 is composed of a bundle of multiple elastic fibers, the elastic member may be cut out to a certain length (e.g., 100 mm) from the leakage-preventing cuff to be measured as a sample, and the mass of the sample may be divided by the length of the sample to express the thickness (fineness) of the elastic member.

[0049] The thickness of the elastic member 83 in a non-stretched state measured by the above-mentioned measuring method is, independently of each other, preferably 200 dtex or more, more preferably 300 dtex or more, and preferably 1000 dtex or less, more preferably 800 dtex or less, provided that the thickness of the elastic member 83 located on the free end 8e side is thinner than the thickness of the elastic member 83 located on the folded portion 8f (or base end 81) side. When three or more elastic members 83 are arranged, the thickness of each elastic member 83 may be gradually increased from the free end 8e toward the base end 81. Alternatively, the elastic member 83 arranged closest to the base end 81 may be the thickest, and the other elastic members 83 may be the same thickness.

[0050] Furthermore, when the thickness of the elastic member 83 located on the free end 8e side is Da and the thickness of the elastic member 83 located on the folded portion 8f side is Db, the ratio of the thickness Db to the thickness Da (Db / Da) is preferably 1.3 or more, more preferably 1.5 or more, and is preferably 3.0 or less, more preferably 2.6 or less, provided that Da is thinner than Db.

[0051] When the leakage preventing cuff 8 is folded outward in the width direction Y at the folding portion 8f and divided into a lower region 8b located on the base end 81 side and an upper region 8u located on the free end side of the standing portion 82, it is preferable to arrange each elastic member 83 so that the elongation ratio of the elastic member 83 arranged closest to the free end 8e of the leakage preventing cuff 8 is greater than the elongation ratio of the elastic member 83 arranged closest to the folding portion 8f, i.e., the elastic member 83 arranged closest to the base end 81. When three or more elastic members 83 are arranged, the extension ratio of each elastic member 83 may be gradually reduced from the free end 8e toward the base end 81. Alternatively, the extension ratio of the elastic member 83 arranged closest to the base end 81 may be the smallest, and the extension ratios of the other elastic members 83 may be the same.

[0052] The ratio (Ea / Eb) of the elongation factor Eb of the elastic member 83 arranged closest to the bent portion 8f (or the base end 81) to the elongation factor Ea of the elastic member 83 arranged closest to the free end 8e is preferably 1.01 or more, preferably 2.00 or less, and more preferably 1.80 or less, provided that Eb is smaller than Ea.

[0053] The stretch ratio of each elastic member 83 can be measured, for example, by the following method. First, each elastic member 83 arranged in the upper region 8u of the leakage-proof cuff 8 is taken out, and each elastic member 83 is stretched to its maximum in the longitudinal direction X of the elastic member 83, and two marks are made on each elastic member 83 with a fixed interval L1 in the stretch direction using an oil-based pen. Next, the length L2 of the marked elastic member 83 is measured in a non-stretched state. This measurement is performed three times for each elastic member 83, and the stretch ratio (times) is calculated from the arithmetic average value of the values ​​calculated by the formula expressed as "L1 / L2". The interval L1 can be, for example, 100 mm.

[0054] The elongation ratio of the elastic members 83 measured in the above-mentioned measurement method is preferably 1.5 times or more, more preferably 2.0 times or more, and preferably 4.0 times or less, more preferably 3.5 times or less, provided that the elongation ratio of the elastic member 83 located on the free end 8e side is arranged so as to be greater than the elongation ratio of the elastic member 83 located on the folded portion 8f (or base end 81) side.

[0055] As described above, the diaper 1 has an exterior body 10 arranged on the non-skin-facing side of the absorbent core 6. In this embodiment, the exterior body 10 has a ventral-side exterior body 10F arranged in the ventral region F and a rear-side exterior body 10R arranged separately from the ventral-side exterior body 10F in the rear region R. When the diaper 1 is unfolded and fully extended as shown in Fig. 2, both end regions of the exterior body 10 in the longitudinal direction X corresponding to the rear region R have a rectangular shape whose length in the width direction Y is longer than that in the longitudinal direction X, and in the central region in the longitudinal direction X corresponding to the crotch region M, both side edges of the central region along the longitudinal direction X are curved.

[0056] The exterior body 10 is disposed relatively far from the absorbent body 5 and is configured to include an outer layer sheet 11 that forms the outer surface of the diaper 1, and an inner layer sheet 12 that is disposed relatively close to the absorbent body 5 and forms the inner surface of the diaper 1. Both sheets 11, 12 are joined together and integrated by adhesive, fusion, or the like.

[0057] In this embodiment, waist gathers are formed in the ventral region F and the back region R. The waist gathers include an exterior body 10 and a plurality of waist gather forming elastic members 13 fixed to the exterior body 10. The plurality of elastic members 13 each extend in the width direction Y and are arranged intermittently in the longitudinal direction X. The waist gathers are produced by fixing the elastic members 13 between the outer layer sheet 11 and the inner layer sheet 12 constituting the exterior body 10 in a state in which the elastic members 13 are stretched in the width direction Y, and then releasing the elastic members 13 from the stretched state. This allows the exterior body 10 to exhibit stretchability in the width direction Y. When the diaper 1 is worn, the elastic members 13 contract to form the substantially continuous annular waist gathers around the entire circumference of the diaper 1.

[0058] In this embodiment, leg gathers are formed at the leg edges that define the opening edges of each of the pair of leg openings LH, LH. The leg gathers include an exterior body 10 and an elastic member 14 for forming leg gathers that is fixed to the exterior body 10. The leg gathers are produced by fixing the elastic member 14 in a stretched state between the outer layer sheet 11 and the inner layer sheet 12 that constitute the exterior body 10, and then releasing the elastic member 14 from the stretched state. When the diaper 1 is worn, the elastic member 14 contracts to form the leg gathers in a substantially continuous ring shape around the entire circumference of the opening edges of the leg openings LH. The elastic member 14 may be one or more.

[0059] The sheets 11 and 12 constituting the exterior body 10 may be the same type of sheets or different types of sheets. The sheets 11 and 12 may have elasticity, particularly elasticity in the width direction Y. As the sheets 11 and 12, nonwoven fabrics produced by various manufacturing methods can be used, and specific examples thereof include single-layer nonwoven fabrics or laminated nonwoven fabrics of two or more layers, such as air-through nonwoven fabrics, heat-rolled nonwoven fabrics, spunlace nonwoven fabrics, spunbonded nonwoven fabrics, and meltblown nonwoven fabrics. The sheets 11 and 12 may also be composite sheets in which these nonwoven fabrics and films are laminated together.

[0060] Unless otherwise specified, various known elastic materials commonly used in this type of absorbent article can be used as materials for the various elastic members in the diaper 1 without any particular restrictions. Examples include synthetic rubbers such as styrene-butadiene, butadiene, isoprene, and neoprene, natural rubber, EVA, elastic polyolefin, and polyurethane. The preferred form of each elastic member is a thread-like (e.g., rubber thread) or band (e.g., flat rubber) member having a rectangular, square, circular, or polygonal cross section, or a multifilament type thread-like member.

[0061] The diaper 1 preferably further comprises a pair of second leakage preventing cuffs 9 extending continuously in the longitudinal direction X at least in both side regions in the width direction Y in the crotch region M as leakage preventing cuffs. In the unfolded and maximum stretched state of the diaper shown in Fig. 2, the second leakage preventing cuffs 9 are separately positioned outward in the width direction Y from the leakage preventing cuffs 8, and are configured to extend in the longitudinal direction X and be stretchable in the longitudinal direction X. The free ends 9e of the consecutive second leakage preventing cuffs 9 are formed so as to be parallel to the free ends 8e of the consecutive leakage preventing cuffs 8 along the longitudinal direction X in a plan view of the diaper in the maximum stretched state. "Parallel" includes both the strict meaning that the free ends 9e of the consecutive second leakage preventing cuffs 9 and the free ends 8e of the consecutive leakage preventing cuffs 8 do not cross each other at all, and the case where the free ends 9e of the consecutive second leakage preventing cuffs 9 and the free ends 8e of the consecutive leakage preventing cuffs 8 are formed in a meandering manner to such an extent that they do not cross each other. Each of the second leakage preventing cuffs 9 is disposed on the non-skin facing side of the absorbent main body 2 .

[0062] The second leakproof cuffs 9 are each independently configured to include a second leakproof cuff-forming sheet 90 that is liquid resistant or water repellent and breathable, similar to the leakproof cuffs 8. As shown in this embodiment, the pair of second leakproof cuff-forming sheets 90 may be configured to include opposing portions formed by folding one sheet 90 in half along the longitudinal direction X, or alternatively, may be configured to include two or more sheets 90. Each second leakproof cuff 9 is continuously disposed in the longitudinal direction X over at least the entire crotch region M on both sides of the absorbent main body 2 in the width direction Y.

[0063] Similarly to the leakage preventing cuff 8, the second leakage preventing cuff 9 preferably has a second base end 91 where the second leakage preventing cuff-forming sheet 90 is fixed to another member, and a second standing portion 92 where the sheet 90 can stand up towards the wearer. In this case, the second standing portion 92 is a portion of the leakage preventing cuff-forming sheet 80 that is not fixed to another member. The second standing portion 92 is present at least in the crotch region M.

[0064] The second base end 91 is a portion that becomes the rising base end when the second standing portion 92 rises toward the wearer's skin when the diaper 1 is worn, and is a portion where the second leakage preventing cuff-forming sheet 90, such as a nonwoven fabric, is joined to another member, specifically, to the non-skin-facing side of the absorbent main body 2. The second base end 91 extends continuously or discontinuously in the longitudinal direction X over substantially the entire length of the second leakage preventing cuff-forming sheet 90 in the longitudinal direction X. In this embodiment, the second base end 91 is formed at a position that overlaps with the base end 81 in a plan view.

[0065] It is also preferable that the second standing portion 92 is configured to extend in the longitudinal direction X and to be expandable and contractible in the longitudinal direction X. 3, one or more second leakage preventing cuff-forming elastic members 93 are arranged in a stretched state at the free end of the second standing portion 92 so as to extend along the longitudinal direction X. Each elastic member 93 is fixed in a stretched state between the second leakage preventing cuff-forming sheets 90 that are folded in half along the longitudinal direction X and opposed to each other, by a fixing method such as adhesive. In this embodiment, one end of each of the elastic members 93 is located in the abdominal region F and the other end is located in the dorsal region R, and each elastic member 93 is arranged continuously in the abdominal region F, the crotch region M and the dorsal region R. As a result, the second standing portion 92 becomes a region that has elasticity in the longitudinal direction X at least at the free end portion where the elastic member 93 is arranged.

[0066] By forming the second leakage preventing cuffs 9 in this manner, when the diaper 1 is worn, the second standing portions 92 rise from the second base ends 91 as standing ends toward the wearer's skin side due to the contractile force of the second leakage preventing cuff forming elastic members 93, similar to the leakage preventing cuffs 8. When the second leakage preventing cuffs 9 are in the standing state, the standing second standing portions 92 can effectively prevent excreted body fluids (excreted fluids) that have unintentionally moved outward in the width direction Y from the standing leakage preventing cuffs 8 from leaking to the outside of the absorbent article. As a result, side leakage, particularly in the crotch region M, is effectively suppressed.

[0067] 2, in a plan view of the absorbent article (diaper 1) in its unfolded and maximum stretched state, the leakage-preventing cuff-forming elastic member 83 included in the leakage-preventing cuff 8 and the second leakage-preventing cuff-forming elastic member 93 included in the second leakage-preventing cuff 9 are preferably arranged so as not to cross each other. In this embodiment, in a plan view of the diaper 1 in its maximum stretched state, the second leakage-preventing cuff 9 is positioned on both sides of the leakage-preventing cuff 8 in the width direction Y such that the two leakage-preventing cuffs 8, 9 do not overlap each other. With this configuration, the leakage-preventing cuff 8 and the second leakage-preventing cuff 9 each stand up independently and are easily brought into close contact with the wearer's skin, thereby further improving leak prevention of excreted liquid.

[0068] 5, the second leakproof cuff 9 has a second base end 91 which is an upright end and a free end including the free end of the second upright portion 92, and it is preferable that the free end of the second upright portion 92 including the elastic member 93 is formed so as to protrude outward in the width direction Y when the absorbent article is in a relaxed state. With this configuration, the outwardly protruding portion of the second leakproof cuff 9 can be brought into surface contact with the wearer's skin, thereby improving the adhesion of the leakproof cuff and more effectively reducing leakage of excretory fluid that has unintentionally flowed out from the leakproof cuff 8.

[0069] 4, the second leakproof cuff 9 is preferably folded outward in the width direction Y at a second folding portion 9f extending in the longitudinal direction X between the second base end 91 and a free end included in the second standing portion 92, and divided into a second lower region 9b located on the second base end 91 side and a second upper region 9u located on the free end side of the second standing portion 92. The second upper region 9u is configured to include a plurality of elastic members 93 as part of the second standing portion 92. This further improves the close contact with the wearer and increases the flexibility of the diaper.

[0070] In the relaxed state of the diaper 1 of this embodiment, at least in the crotch region M, the second leakage preventing cuff 9 folded at the second folding portion 9f has the second folding portion 9f located closer to the second base end 91 than the free end of the second standing portion 92. Therefore, in the relaxed state of the diaper 1, the second leakage preventing cuff 9 is bent at the second folding portion 9f, and the free end of the second standing portion 92 protrudes outward in the width direction Y. The second lower region 9b and the second upper region 9u both extend along the longitudinal direction X and are both substantially rectangular in plan view.

[0071] Although the diaper 1 in each of the above-mentioned embodiments has been described as a form in which the absorbent body 5 does not have any stretchable regions, if necessary, the absorbent body 5 may be configured to have stretchability, for example by providing an elastic member in the absorbent body 5. An example of such a configuration is a configuration in which a pair of side elastic members are arranged in a stretched state on both side edges of the absorbent core 6 in the longitudinal direction X of the absorbent body 5 to facilitate standing up both side portions of the absorbent body 5 in the width direction Y. Such side elastic members are preferably arranged at least in the crotch region M, and more preferably, both ends of the side elastic members extend to both end edges of the absorbent core 6 in the longitudinal direction X and are arranged continuously in the abdominal region F, the crotch region M and the back region R. At least both ends of the side elastic members are fixed to at least the absorbent body 5 by a known fixing method such as an adhesive. The number of side elastic members may be one or more. Since the side elastic members are fixed in a stretched state to both side portions in the width direction Y of the absorbent body 5, both side portions in the width direction Y of the absorbent body 5 rise up toward the wearer's skin when the diaper 1 is worn. These rising portions block the movement of bodily fluids in the width direction Y, thereby preventing lateral leakage of the bodily fluids.

[0072] The absorbent core 6 preferably has a bend induction portion extending along the longitudinal direction X at an inner position on both sides in the width direction Y. The bend induction portion is a portion that functions as a flexible axis when the side portions in the width direction Y of the absorbent core 6 rise toward the wearer's skin when the diaper is in a relaxed state, and is the same portion as the rising start point of the absorbent body 5 including the absorbent core 6. The bend induction portion can be formed, for example, by configuring the absorbent core 6 to have a stiffness difference or density difference. This can increase the rising ability of the absorbent body 5 and reduce the lateral movement of excreted liquid, thereby further improving the liquid absorption performance.

[0073] The diaper 1 according to the preferred embodiment described above further improves the fit and flexibility of the absorbent article when worn, thereby reducing discomfort such as stiffness when wearing the diaper.

[0074] In the above-described embodiment of the diaper 1, the outer body 10 is formed separately into a ventral outer body and a rear outer body. Alternatively, the outer body 10 may be formed so as to extend continuously from the ventral region F to the rear region R.

[0075] From the viewpoint of increasing the flexibility of the leakage preventing cuffs 8 and further improving the fit to the wearer, it is preferable that one or more leakage preventing cuff-forming elastic members (hereinafter also referred to as "third elastic members") are further disposed in the intermediate region between the free end of the standing portion 82 and the base end portion 81, in addition to the elastic members 83. In this case, the third elastic member is disposed so as to extend along the longitudinal direction X, and is fixed in a stretched state between the pair of opposing leakage preventing cuff-forming sheets 80 by a fixing method such as an adhesive. The third elastic member is preferably disposed at least in the crotch region M.

[0076] Although the present invention has been described above based on the embodiments, the present invention is not limited to the above embodiments and can be modified as appropriate. In addition, all of the above-described embodiments can be used in combination with each other as appropriate.

[0077] In relation to the above-mentioned embodiment, the following absorbent article is further disclosed. <1> An absorbent article having a longitudinal direction corresponding to the front-rear direction of a wearer and a width direction perpendicular thereto, the absorbent body including a top sheet, a back sheet and an absorbent body, and leak-proof cuffs extending in the longitudinal direction, The leak-proof cuffs each include a pair of opposing nonwoven fabrics, a plurality of elastic members disposed between the nonwoven fabrics so as to extend in the longitudinal direction, and a liquid-impermeable sheet disposed between the nonwoven fabrics, The leak-proof cuff has a proximal end serving as an upright end and a free end, the free end portion has an end region including the free end portion where the liquid-impermeable sheet is not present, In a plan view of the free end portion, at least one of the elastic members overlaps with the liquid-impermeable sheet, In a plan view of the free end portion, all of the elastic members overlapping the liquid-impermeable sheet are located only on one surface side of the liquid-impermeable sheet, a joint portion for joining the nonwoven fabric and the liquid-impermeable sheet is formed between the base end portion and the free end portion of the leakage-preventing cuff, An absorbent article, wherein the joint is located only on the other surface side of the liquid-impermeable sheet and is located closer to the base end than the position of the elastic member that is located closest to the base end.

[0078] <2> a standing inhibition portion, which is a portion where the standing of the nonwoven fabric is inhibited, is formed at both ends in the longitudinal direction of the leak-proof cuff; The stand-up inhibiting portion is formed by fixing the nonwoven fabric and the absorbent body. <1> The absorbent article according to claim 1. <3> At least a portion of the liquid-impermeable sheet is disposed between the nonwoven fabrics in the leak-proof cuffs. <1> or <2> The absorbent article according to claim 1. <4> The entire liquid-impermeable sheet is disposed between the nonwoven fabrics in the leak-proof cuffs. <1> ~ <3> 13. An absorbent article according to any one of claims 1 to 12. <5> The garment has a ventral region arranged on the ventral side of a wearer, a dorsal region arranged on the dorsal side of the wearer, and a crotch region located between the ventral region and the dorsal region, The liquid-impermeable sheet is disposed at least in the crotch region. <1> ~ <4> 13. An absorbent article according to any one of claims 1 to 12.

[0079] <6> The liquid-impermeable sheet extends to both ends in the longitudinal direction and is disposed continuously in the abdominal region, the crotch region and the back region. <5> The absorbent article according to claim 1. <7> The entire joint portion is located only on the other surface side of the liquid-impermeable sheet and is located closer to the base end portion than the position of the elastic member located closest to the base end portion. <1> ~ <6> 13. An absorbent article according to any one of claims 1 to 12. <8> The garment has a ventral region arranged on the ventral side of a wearer, a dorsal region arranged on the dorsal side of the wearer, and a crotch region located between the ventral region and the dorsal region, The end region including the free end of the leakage preventing cuff is formed at least in the crotch region, and The rod has a predetermined width from the free end toward the base end and extends in the longitudinal direction. <1> ~ <7> 13. An absorbent article according to any one of claims 1 to 12.

[0080] <9> In a plan view of the absorbent article in a maximum stretched state, a distance D1 along the width direction between the free end of the leakage preventing cuff and an end of the liquid-impermeable sheet located on the free end side of the leakage preventing cuff is preferably 1 mm or more, more preferably 3 mm or more, The distance D1 is preferably 30 mm or less, more preferably 20 mm or less. <1> ~ <8> 13. An absorbent article according to any one of claims 1 to 12. <10> In a plan view of the free end portion, all of the elastic members overlapping the liquid-impermeable sheet are located only on the skin-facing surface side of the liquid-impermeable sheet. <1> ~ <9> 13. An absorbent article according to any one of claims 1 to 12. <11> In a plan view of the free end portion, the joint portion is located only on the non-skin facing surface side of the liquid impermeable sheet. <1> ~ <10> 13. An absorbent article according to any one of claims 1 to 12.

[0081] <12> The leak-proof cuff has a bent portion located between the base end and the free end and extending in a longitudinal direction, The bent portion is bent outward in the width direction and divided into a lower region located on the base end side and an upper region located on the free end side. <1> ~ <11> 13. An absorbent article according to any one of claims 1 to 12. <13> The thickness of the elastic member disposed closest to the free end is thinner than the thickness of the elastic member disposed closest to the base end. <12> The absorbent article according to claim 1. <14> The ratio (Db / Da) of the thickness Da of the elastic member disposed closest to the free end to the thickness Db of the elastic member disposed closest to the base end is preferably 1.3 or more, more preferably 1.5 or more; The ratio (Db / Da) is preferably 3.0 or less, more preferably 2.6 or less. <12> or <13> The absorbent article according to claim 1.

[0082] <15> The thickness of the elastic member disposed closest to the free end is preferably 200 dtex or more, more preferably 300 dtex or more, in terms of fineness; Preferably, the fiber size is 1000 dtex or less, more preferably 800 dtex or less. <12> ~ <14> 13. An absorbent article according to any one of claims 1 to 12. <16> The thickness of the elastic member disposed closest to the base end is preferably 200 dtex or more, more preferably 300 dtex or more, in terms of fineness; Preferably, the fiber size is 1000 dtex or less, more preferably 800 dtex or less. <12> ~ <15> 13. An absorbent article according to any one of claims 1 to 12. <17> The elongation ratio of the elastic member disposed closest to the free end is greater than the elongation ratio of the elastic member disposed closest to the base end. <12> ~ <16> 13. An absorbent article according to any one of claims 1 to 12.

[0083] <18> A ratio (Ea / Eb) of an elongation factor Ea of the elastic member disposed closest to the free end to an elongation factor Eb of the elastic member disposed closest to the base end is preferably 1.01 or more, The ratio (Ea / Eb) is preferably 2.00 or less, more preferably 1.80 or less. <12> ~ <17> 13. An absorbent article according to any one of claims 1 to 12. <19> The elongation ratio of the elastic member disposed closest to the free end is preferably 1.5 times or more, more preferably 2.0 times or more, The ratio is preferably 4.0 times or less, more preferably 3.5 times or less. <12> ~ <18> 13. An absorbent article according to any one of claims 1 to 12. <20> The elongation ratio of the elastic member disposed closest to the base end is preferably 1.5 times or more, more preferably 2.0 times or more, The ratio is preferably 4.0 times or less, more preferably 3.5 times or less. <12> ~ <19> 13. An absorbent article according to any one of claims 1 to 12.

[0084] <21> A pair of upright inhibition portions, which are portions where the upright of the nonwoven fabric is inhibited, are formed at both ends in the longitudinal direction of the leakage preventing cuff, When the free end is viewed in plan, between the two upright-inhibiting portions, the ratio of the area of ​​the joint portion located on the free end side of the arrangement position of the elastic member located closest to the base end to the area from the free end to the arrangement position of the elastic member located closest to the base end is 2% or less; or The joint portion is not present on the free end side of the position of the elastic member located closest to the base end portion. <1> ~ <20> 13. An absorbent article according to any one of claims 1 to 12. <22> In a plan view of the free end, the ratio of an area of ​​the joint portion located on the free end side from the arrangement position of the elastic member located closest to the base end to an area from the free end to the arrangement position of the elastic member located closest to the base end is more preferably 0.5% or less. <21> The absorbent article according to claim 1. <23> Further comprising a pair of second leak-proof cuffs arranged separately from the leak-proof cuffs, the second leakage preventing cuff is disposed so as to be located outward in a width direction from the leakage preventing cuff in a plan view in a maximum stretched state of the absorbent article, The second leak-proof cuff has a pair of opposing second nonwoven fabrics and a plurality of second elastic members disposed in a stretched state so as to extend in the longitudinal direction between the second nonwoven fabrics. <1> ~ <22> 13. An absorbent article according to any one of claims 1 to 12.

[0085] <24> In a plan view of the absorbent article in a maximum stretched state, the elastic member included in the leakage preventing cuff and the second elastic member included in the second leakage preventing cuff are arranged so as not to cross each other. <23> The absorbent article according to claim 1. <25> In a plan view of the absorbent article in a maximum stretched state, the second leak-proof cuff is arranged so as not to overlap both widthwise sides of the leak-proof cuff. <23> or <24> The absorbent article according to claim 1. <26> The leak-proof cuff and the second leak-proof cuff are both arranged continuously along the longitudinal direction, In a plan view of the absorbent article in a maximum stretched state, the free ends of the adjacent second leak-proof cuffs are formed so as to be parallel to the free ends of the adjacent leak-proof cuffs along the longitudinal direction. <23> ~ <25> 13. An absorbent article according to any one of claims 1 to 12.

[0086] <27> The second leak-proof cuff has a second base end portion which is an upright end, and a second upright portion which includes a free end portion and can stand up toward the wearer. <23> ~ <26> 13. An absorbent article according to any one of claims 1 to 12. <28> The second leak-proof cuff is disposed between the second nonwoven fabrics in a stretched state so that the second elastic member extends along the longitudinal direction of the free end portion, thereby forming a region having elasticity in the longitudinal direction at the free end portion. <23> ~ <27> 13. An absorbent article according to any one of claims 1 to 12. <29> When the absorbent article is in a relaxed state, the free end of the second standing portion is formed to protrude outward in the width direction. <27> or <28> The absorbent article according to claim 1. <30> the second leak-proof cuff has a second bent portion located between the second base end and the free end and extending in the longitudinal direction, The second bent portion is bent outward in the width direction and divided into a second lower region located on the second base end side and a second upper region located on the free end side. <23> ~ <29> 13. An absorbent article according to any one of claims 1 to 12.

[0087] <31> A pair of side elastic members are further arranged in a stretched state on both sides along the longitudinal direction of the absorbent body so as to extend along the longitudinal direction, and both sides in the width direction of the absorbent body are configured to be able to stand up. <1> ~ <30> 13. An absorbent article according to any one of claims 1 to 12. <32> The absorbent body comprises an absorbent core; The absorbent core has bend guide portions extending along the longitudinal direction at inner positions of both widthwise sides. <1> ~ <31> 13. An absorbent article according to any one of claims 1 to 12. <33> a third elastic member is further disposed in a stretched state in a middle region between the base end and the free end of the leakage preventing cuff so as to extend along the longitudinal direction; <1> ~ <32> 13. An absorbent article according to any one of claims 1 to 12. [Explanation of symbols]

[0088] 1. Pants-type disposable diapers (absorbent articles) 2. Absorbent body 3 Surface sheet 4 Back sheet 5. Absorber 8 Leakproof cuff 8e free end 80 Leak-proof cuff forming sheet (non-woven fabric) 83 Elastic member for forming leak-proof cuff 85 Liquid-impermeable sheet 10 Exterior body X Longitudinal direction Y Width direction F ventral region M Inseam area R dorsal region

Claims

1. An absorbent article having a longitudinal direction corresponding to the front-rear direction of a wearer and a width direction perpendicular thereto, the absorbent body including a top sheet, a back sheet and an absorbent body, and leak-proof cuffs extending in the longitudinal direction, The leak-proof cuffs each include a pair of opposing nonwoven fabrics, a plurality of elastic members disposed between the nonwoven fabrics so as to extend in the longitudinal direction, and a liquid-impermeable sheet disposed between the nonwoven fabrics, The leak-proof cuff has a proximal end serving as an upright end and a free end, the free end portion has an end region including the free end portion where the liquid-impermeable sheet is not present, In a plan view of the free end portion, at least one of the elastic members overlaps with the liquid-impermeable sheet, In a plan view of the free end portion, all of the elastic members overlapping the liquid-impermeable sheet are located only on one surface side of the liquid-impermeable sheet, a joint portion for joining the nonwoven fabric and the liquid-impermeable sheet is formed between the base end portion and the free end portion of the leakage-preventing cuff, An absorbent article, wherein the joint is located only on the other surface side of the liquid-impermeable sheet and is located closer to the base end than the position of the elastic member that is located closest to the base end.

2. The absorbent article according to claim 1 , wherein, in a plan view of the free end portion, all of the elastic members overlapping the liquid-impermeable sheet are located only on the skin-facing side of the liquid-impermeable sheet.

3. The leak-proof cuff has a bent portion located between the base end and the free end and extending in a longitudinal direction, 3. The absorbent article according to claim 1, wherein the folded portion is folded outward in the width direction to divide the absorbent article into a lower region located on the base end side and an upper region located on the free end side.

4. The absorbent article according to any one of claims 1 to 3, wherein the thickness of the elastic member arranged closest to the free end is thinner than the thickness of the elastic member arranged closest to the base end.

5. The absorbent article according to any one of claims 1 to 4, wherein the elongation ratio of the elastic member disposed closest to the free end is greater than the elongation ratio of the elastic member disposed closest to the base end.

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