Absorbent article

Abstract

The utility model provides an absorptive article. A front piece (3) is provided with a part which is overlapped with an absorber (5) when being overlooked, and an extension part (32E) which extends from a side edge (5S) of the absorber (5) to the outer side in the transverse direction (Y). A hydrophobic turnup sheet (70) constituting the main body of the leak-proof turnup (7) has, at least in the crotch portion (M), a region in which the outer side in the lateral direction (Y) becomes a fixed portion (71) that is fixed to another member and the inner side in the lateral direction (Y) becomes a free portion (72) that is not fixed to another member. A sealing section (10) in which the skin-side hydrophobic sheets (22, 23, 70) and the non-skin-side hydrophobic sheet (4) are joined is present in the hydrophobic sheet overlapping section (24) of the side wing section (20), and the sealing section (10) is formed continuously in the longitudinal direction (X) over the entire length of the longitudinal direction (X) of the diaper (1) by passing between the extended section (32E) of the surface sheet (3) and the leg peripheral elastic member (8) disposed on the outermost side in the transverse direction (Y).

Description

Technical Field

[0001] The utility model relates to an absorbent article which can be used for absorbing and retaining excreta such as urine. Background Art

[0002] Absorbent articles such as disposable diapers typically include: an absorbent body that absorbs and retains body fluids; a hydrophilic front sheet that is arranged at a position closer to the wearer's skin than the absorbent body; and a hydrophobic back sheet that is arranged at a position farther from the wearer's skin than the absorbent body. In absorbent articles of this structure, the prior art provides leak-proof cuffs that stand up to the wearer's skin along the longitudinal sides of the absorbent article for the purpose of preventing the lateral leakage of excreta such as urine and soft stool (so-called side leakage), and configures leg elastic components in a retractable manner in the parts of the absorbent article that are arranged around the wearer's legs (for example, patent documents 1 and 2). In addition, the longitudinal direction mentioned here is the direction corresponding to the front-to-back direction of the wearer of the absorbent article, and the transverse direction is the direction orthogonal to the longitudinal direction.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 63-99301

[0006] Patent Document 2: Japanese Patent Application Laid-Open No. 2-102649 Summary of the invention

[0007] The utility model provides an absorbent article, which has a longitudinal direction extending from the wearer's ventral side to the back side through the crotch part and a lateral direction orthogonal to the longitudinal direction, and has a crotch part arranged at the crotch part when worn, a ventral part arranged at a position closer to the wearer's ventral side than the crotch part, and a dorsal part arranged at a position closer to the wearer's back side than the crotch part, and includes: an absorbent body for absorbing and retaining body fluids; a front sheet arranged on the skin-opposite side of the absorbent body; a pair of leak-proof cuffs extending in the longitudinal direction and arranged in a manner covering the two side portions of the front sheet along the longitudinal direction; and a pair of side wing parts extending from the two side edges of the absorbent body along the longitudinal direction to the outside of the lateral direction, and leg elastic parts are arranged at the parts of the side wing parts arranged around the wearer's legs in a manner that can be stretched and retracted in the longitudinal direction.

[0008] In one embodiment of the absorbent article of the present invention, the surface sheet has a portion overlapping the absorbent body in a plan view, and has an extension portion extending from a side edge of the absorbent body along the longitudinal direction toward an outer side in the lateral direction.

[0009] In one embodiment of the absorbent article of the present invention, the leak-proof cuff includes a hydrophobic cuff sheet, which has an area in at least the crotch portion where the outer side in the transverse direction becomes a fixed portion fixed to other components and the inner side in the transverse direction becomes a free portion not fixed to other components.

[0010] In one embodiment of the absorbent article of the present invention, the side wing portion includes a skin-side hydrophobic sheet arranged on the skin-opposing side of the front sheet or the absorbent body, and a non-skin-side hydrophobic sheet arranged on the non-skin-opposing side of the absorbent body, and between the absorbent body and the leg elastic component arranged at the outermost side in the horizontal direction, there is a hydrophobic sheet overlapping portion in which the skin-side hydrophobic sheet and the non-skin-side hydrophobic sheet are arranged relatively to each other, and the hydrophobic sheet overlapping portion extends in the longitudinal direction over the entire longitudinal length of the absorbent article.

[0011] In one embodiment of the absorbent article of the present invention, there is a sealing portion where the skin-side hydrophobic sheet and the non-skin-side hydrophobic sheet are joined in the overlapping portion of the hydrophobic sheets. The sealing portion passes between the extended portion of the front sheet and the outermost leg elastic component arranged in the transverse direction, and is continuously formed in the longitudinal direction over the entire longitudinal length of the absorbent article.

[0012] Other features, effects and implementation modes of the present invention are described below. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a developed plan view schematically showing the skin-facing side (front sheet side) of the developed disposable diaper as one embodiment of the absorbent article of the present invention in a developed and maximally stretched state.

[0014] Figure 2 It is schematically indicated Figure 1 A cross-sectional view of section II (a cross-sectional view of the crotch portion along the thickness direction). DETAILED DESCRIPTION

[0015] When the wearer of an absorbent article with a leak-proof cuff discharges urine or other excreta in the longitudinal central area of ​​the absorbent article while the wearer is in a side-lying sleeping position, the excreta flows downward on the front sheet due to gravity and reaches the base end of the leak-proof cuff located at the bottom. The base end of the leak-proof cuff is the fixing portion of the leak-proof cuff with other components (such as the front sheet) and is the starting point when standing up. Typically, since it is located on the lateral outside of the absorbent body, the excreta reaching the base end is not absorbed into the inside of the absorbent article, but is easily accumulated between the leak-proof cuff and the other components. In this way, the excreta accumulated at the base end of the leak-proof cuff in the longitudinal central area of ​​the absorbent article spreads in the longitudinal direction through the above-mentioned other components, which may become the cause of side leakage at the longitudinal end of the absorbent article. There has not yet been provided a technology with excellent side leakage prevention performance that can effectively prevent "side leakage at the longitudinal end of the absorbent article" that is unique to absorbent articles with such leak-proof cuffs.

[0016] Therefore, an object of the present invention is to provide an absorbent article having excellent side leakage prevention performance.

[0017] Hereinafter, the preferred embodiment of the present invention will be described with reference to the accompanying drawings. In addition, in the following description of the accompanying drawings, the same or similar parts are marked with the same or similar reference numerals. The accompanying drawings are basically schematic illustrations, and the ratios of various dimensions, etc. may be different from the actual ones.

[0018] Figure 1 and Figure 2 A disposable diaper 1 (hereinafter also referred to as "diaper 1") as an embodiment of the absorbent article of the present invention is shown. The diaper 1 has a longitudinal direction X corresponding to the front-back direction of the wearer, that is, a direction extending from the ventral side to the dorsal side via the crotch portion, and a lateral direction Y orthogonal to the longitudinal direction X, and has: a crotch portion M arranged in the crotch portion of the wearer and including an excretion portion opposite to the excretion portion such as the penis (not shown); an ventral portion F arranged at a position closer to the ventral side (front side) of the wearer than the crotch portion M; and a dorsal portion R arranged at a position closer to the dorsal side (rear side) of the wearer than the crotch portion M.

[0019] In the present embodiment, the diaper 1 is formed symmetrically on one side and the other side across the transverse center line CLy in the unfolded and maximally stretched state.

[0020] The front part F is a part of the front body of the diaper 1, and the back part R is a part of the back body of the diaper 1. The crotch part M straddles the longitudinal center line CLx in the longitudinal direction X and exists in both the front body and the back body of the diaper 1.

[0021] In the present invention, the ventral portion F, the crotch portion M, and the dorsal portion R may be regions obtained by dividing the diaper 1 in the unfolded and maximally stretched state into three equal parts in the longitudinal direction X.

[0022] The transverse centerline CLy is an imaginary straight line that bisects the unfolded and maximally stretched diaper 1 in the transverse direction Y and extends in the longitudinal direction X. The longitudinal centerline CLx is an imaginary straight line that bisects the unfolded and maximally stretched diaper 1 in the longitudinal direction X and extends in the transverse direction Y.

[0023] In this specification, "expanded and maximally stretched state" means that the object (absorbent article, etc.) is expanded into a plane and becomes an expanded state, and the elastic components of each part of the object in the expanded state are stretched to the maximum extent and expanded to the design size, that is, the size when expanded into a plane in a state completely eliminating the influence of the elastic components. In the case where the object is an absorbent article with side seals, the absorbent article is separated at the side seals and expanded into a plane to become the above-mentioned expanded state.

[0024] The diaper 1 includes: an absorbent body 5 for absorbing and retaining body fluids such as urine; a front sheet 3 arranged on the skin-opposing side of the absorbent body 5; a pair of leak-proof cuffs 7, 7 extending in the longitudinal direction X in a manner covering the two side portions of the front sheet 3 along the longitudinal direction X; and a pair of side wings 20, 20 extending from the two side edges 5S, 5S of the absorbent body 5 along the longitudinal direction X to the outside of the transverse direction Y, respectively, and a leg elastic component 8 is arranged at a portion of the side wing 20 arranged around the wearer's legs in a manner that can be stretched and retracted in the longitudinal direction X.

[0025] The diaper 1 of this embodiment is a so-called unfolded disposable diaper. Figure 1 As shown, a fixing component 21 having a fixing portion (not shown) is provided on both side edges along the longitudinal direction X of the back portion R of the diaper 1, and a fixing area (not shown) to which the fixing portion can be fixed is provided on the non-skin opposite side of the sheet (the outer sheet 6 in this embodiment) forming the non-skin opposite side of the ventral portion F of the diaper 1.

[0026] In this specification, the "skin-opposing surface" refers to the surface of an absorbent article or its component (e.g., absorber) that faces the skin of the wearer when the absorbent article is worn, that is, the side relatively close to the skin of the wearer, and the "non-skin-opposing surface" refers to the surface of an absorbent article or its component that faces the opposite side of the skin when the absorbent article is worn, that is, the side relatively far from the skin of the wearer. In addition, "when worn" as mentioned here means maintaining a normal appropriate wearing position, that is, a state in which the absorbent article is correctly worn.

[0027] In this embodiment, the diaper 1 has an absorbent body 2, and the absorbent body 2 includes a front sheet 3 and an absorbent body 5. Figure 2 As shown, the absorbent body 2 also includes a back sheet 4 disposed on the non-skin opposite side of the absorbent body 5, and an outer sheet 6 disposed on the non-skin opposite side of the back sheet 4. The absorbent body 2 (absorbent body 5) extends from the ventral part F to the dorsal part R in the longitudinal direction X, and its length direction is consistent with the longitudinal direction X. The front sheet 3 forms the skin opposite side (inner surface) of the diaper 1 together with the cuff sheet 70 described later, and the outer sheet 6 forms the non-skin opposite side (outer surface) of the diaper 1. The various components of the absorbent body 2 are mutually joined by known joining means such as adhesives.

[0028] As components of the absorbent body 2 , when the components are described later, it is assumed that the description is applicable, and components generally used in such absorbent articles can be used without particular limitation.

[0029] As the surface sheet 3, various liquid-permeable sheets can be used, for example, nonwoven fabric, woven fabric, paper. The surface sheet 3 is typically hydrophilic.

[0030] As the back sheet 4, a sheet with leakproofness can be used, specifically, a sheet with liquid impermeability (the property of not permeating liquid at all) or liquid-impermeability (although it cannot be said to be liquid impermeability, it is difficult to permeate liquid) can be used, for example, a moisture-permeable resin film, a laminate of the resin film and a nonwoven fabric can be cited. The back sheet 4 is typically hydrophobic.

[0031] like Figure 2 As shown, the absorbent body 5 includes an absorbent core 50 with absorbent material as the main body, and a core wrapper 51 covering the outer surface (skin-opposite side and non-skin-opposite side) of the absorbent core 50. As the above-mentioned absorbent material, typically one or more selected from fiber materials such as wood pulp and absorbent polymers are used. The absorbent core 50 can be, for example, a fiber-accumulated type with an aggregate of fiber materials as the main body and absorbent polymer particles carried in the aggregate as needed, or a sheet type with absorbent polymer particles fixed inside or on the surface of a fiber sheet. The above-mentioned sheet type is thinner and softer than the above-mentioned fiber-accumulated type. The core wrapper 51 is liquid permeable and is typically made of paper, non-woven fabric, etc. The absorbent body 5 can also be composed of the absorbent core 50 alone without including the core wrapper 51.

[0032] As the outer covering sheet 6, an outer covering sheet having a good touch to the skin is preferred, and from this viewpoint, various nonwoven fabrics are preferably used. In addition, the absorbent article of the present invention may not have the outer covering sheet 6.

[0033] The top sheet 3 has a portion overlapping the absorber 5 (absorbent core 50 ) in a plan view, and has an extension portion extending outward in the lateral direction Y from the side edge 5S of the absorber 5 (hereinafter also referred to as a “top sheet lateral extension portion”).

[0034] In the present embodiment, as described below, the topsheet 3 has a laminated structure in which a plurality of layers are laminated in the thickness direction, and a portion (the second layer 32 ) of the plurality of layers constitutes the topsheet transversely extending portion.

[0035] like Figure 2 As shown, the front sheet 3 includes a first layer 31 disposed on the side relatively close to the wearer's skin and a second layer 32 disposed overlapping the non-skin facing surface of the first layer 31. The front sheet 3 has a double-layer structure of the first layer 31 and the second layer 32.

[0036] In this embodiment, the front sheet 3 has a concavoconvex shape on the skin-facing side. Figure 2 As shown, a plurality of convex portions 33 protruding toward the wearer's skin are dispersedly formed on the skin-opposing surface of the first layer 31, thereby forming a concavo-convex shape consisting of each convex portion 33 and concave portions (non-convex portions) located around the convex portions 33 on the skin-opposing surface of the front sheet 3. The second layer 32 forming the non-skin-opposing surface of the front sheet 3 does not substantially have a concavo-convex shape but is flat.

[0037] When the surface sheet 3 has an uneven shape on the skin-facing surface, the skin feel, cushioning properties, and surface dryness of the surface sheet 3 are improved, and thus the wearing feeling of the diaper 1 can be expected to be improved.

[0038] More specifically, in the present embodiment, the front sheet 3 has a plurality of joints between the first layer 31 and the second layer 32, and the portion other than the joint in the first layer 31 protrudes to the opposite side of the second layer 32 to form a convex portion 33. The convex portion 33 may be a solid structure filled with the constituent fibers of the front sheet 3, or may be a hollow structure not filled with the constituent fibers. The means for joining the first layer 31 and the second layer 32 in the above-mentioned joint is not particularly limited, and may be a known joining means such as an adhesive and welding. The welding of the first layer 31 and the second layer 32 can be carried out, for example, by applying pressure in the thickness direction while the two layers 31 and 32 are overlapped, and the two layers 31 and 32 are subjected to a heating treatment, an ultrasonic treatment, or the like to form a melting treatment of the material.

[0039] As a preferred embodiment of the front sheet 3, the first layer 31 and the second layer 32 each include a nonwoven fabric, and the joint between the two layers 31 and 32 is a fusion bond. As the nonwoven fabric constituting the two layers 31 and 32, nonwoven fabrics based on various production methods can be used without particular limitation, for example, hot air nonwoven fabrics, hot roll nonwoven fabrics, spunlace nonwoven fabrics, spunbond nonwoven fabrics, meltblown nonwoven fabrics, and spunbond-meltblown-spunbond (SMS) nonwoven fabrics can be cited.

[0040] In addition, the first layer 31 may not have an uneven shape on the skin-facing surface. The present invention includes an embodiment in which both the skin-facing surface and the non-skin-facing surface of the front sheet are flat surfaces that do not substantially have convex portions.

[0041] The second layer 32 has a portion overlapping with the absorber 5 (absorbent core 50 ) in a plan view, and has a second layer extension portion 32E extending outward in the transverse direction Y from the side edge 31S along the longitudinal direction X of the first layer 31 .

[0042] In this embodiment, if Figure 1 and Figure 2 As shown, a pair of second layer extension portions 32E are arranged on both sides of the first layer 31 in the transverse direction Y. The pair of second layer extension portions 32E each extend over the entire length of the longitudinal direction X of the diaper 1 .

[0043] Furthermore, in the present invention, the second layer extension portion 32E may be disposed only on one of the two sides in the lateral direction Y sandwiching the first layer 31 .

[0044] In this embodiment, if Figure 1 and Figure 2 As shown, the second layer 32 is composed of a sheet (for example, nonwoven fabric) whose side edges 32S, 32S along the longitudinal direction X are located outside the side edges 5S, 5S along the longitudinal direction X of the absorbent body 5 in the transverse direction Y.

[0045] To further explain, in the present embodiment, both the first layer 31 and the second layer 32 have a rectangular shape that is longer in the longitudinal direction X when viewed from above, and the length (width) of the second layer 32 in the lateral direction Y is longer than the length (width) of the first layer 31 in the lateral direction Y, and the first layer 31 with a relatively narrow width is arranged in the central area of ​​the lateral direction Y of the second layer 32 with a relatively wide width, and the second layer extension 32E extends from the two side edges 31S, 31S of the first layer 31, respectively. In addition, the width of the second layer 32 is longer than the maximum width of the absorbent body 5 (absorbent core 50), and the second layer extension 32E extends from the two side edges 5S, 5S of the absorbent body 5, respectively. In the present embodiment, the above-mentioned lateral extension of the front sheet is composed of the second layer 32. The central area of ​​the lateral direction Y of the front sheet 3 is composed of a double-layer structure of the first layer 31 and the second layer extension 32E is provided on both sides of the lateral direction Y across the double-layer structure.

[0046] In addition, in the present invention, the second layer extension portion 32E does not need to extend from the side edge 5S of the absorber 5. That is, in the present invention, the entire second layer 32 and the absorber 5 overlap in a plan view.

[0047] The second layer 32 has a higher hydrophilicity than the first layer 31. In the present invention, "hydrophilicity" refers to a value with the contact angle of the constituent fibers of the sheet (fiber layer) measured by the following method as an indicator, and the judgment is made based on the contact angle. Specifically, a high hydrophilicity is synonymous with a small contact angle, and a low hydrophilicity is synonymous with a large contact angle. Therefore, in the front sheet 3, the relationship of "contact angle of the first layer 31 > contact angle of the second layer 32" holds. Unless otherwise specified, the "contact angle" in this specification refers to the contact angle measured by the following method. In this specification, if the contact angle is less than 90 degrees, the sheet is hydrophilic, and if the contact angle exceeds 90 degrees, the sheet is hydrophobic.

[0048] <Contact Angle Measurement Method>

[0049] Take out the fiber from the sheet of the measurement object and measure the contact angle of water relative to the fiber. Scissors and tweezers are used to take out the fiber. In addition, the fiber in the sheet of the measurement object is taken out from the two sides of the sheet (two surface parts) and the part sandwiched by them (the central part in the thickness direction). As a measuring device, an automatic contact angle meter MCA-J manufactured by Kyowa Interface Science Co., Ltd. is used. Deionized water is used in the measurement of the contact angle. The amount of liquid ejected from the inkjet water droplet ejection part (Cluster Technology Co., Ltd., a pulse ejector CTC-25 with an ejection part aperture of 25μm) is set to 20 picoliters, and the water droplets are dripped directly above the fiber. The dripping situation is recorded in a high-speed video recording device connected to a horizontally arranged camera. From the viewpoint of subsequent image analysis, the video recording device is preferably a personal computer assembled with a high-speed capture device. In this measurement, images are recorded every 17msec. In the recorded video, the initial image of a water droplet being dropped on the fiber is analyzed using the attached software FAMAS (software version 2.6.2, measurement method is drop method, analysis method is θ / 2 method, image processing algorithm is non-reflection, image processing image mode is frame, threshold level is 200, and curvature correction is not performed) to calculate the angle between the surface of the water droplet in contact with the air and the fiber as the contact angle. The fiber taken out from the piece of the measurement object is cut into a fiber length of 1 mm, and the fiber is placed on the sample table of the contact angle meter and maintained horizontally. The contact angles of two different locations are measured for one fiber. The contact angles of N=5 fibers are measured to one decimal place, and the average value of the measured values ​​at a total of 10 locations (rounded off to the second decimal place) is defined as the contact angle of the fiber with water. The measurement environment is room temperature 22±2°C and humidity 65±2%RH. The smaller the value of the contact angle, the higher the hydrophilicity.

[0050] In the absorbent article, when the sheet to be measured is joined to other parts by adhesive, welding, etc., it is removed after removing the joining force of the joined parts by blowing cold air of cold spray, etc. within the range that does not affect the contact angle of the fibers. This method of removing the sheet to be measured from the absorbent article can also be used for other measurements.

[0051] The gram weight of the front sheet 3 is not particularly limited. From the perspective of more reliably exerting the prescribed effect of the present invention, the gram weights of the first layer 31 and the second layer 32 are preferably 10 g / m 2 More preferably 12 g / m 2 More than, and preferably 30g / m 2 Below, more preferably 25g / m 2 The first layer 31 and the second layer 32 may have the same weight or different weight.

[0052] The leak-proof cuff 7 includes a hydrophobic cuff sheet 70. Figure 1 As shown, the leak-proof cuff 7 (cuff sheet 70) is continuously arranged in the longitudinal direction X over the entire length of the diaper 1. Both sides of the skin-opposing surface of the diaper 1 along the longitudinal direction X are respectively formed by the cuff sheet 70. As the cuff sheet 70, any material that can be used as a leak-proof cuff of such an absorbent article can be used without particular limitation, for example, a material that can be used as the back sheet 4 can be used.

[0053] like Figure 2 As shown, the cuff sheet 70 has at least in the crotch portion M a fixing portion 71 fixed to other components (in this embodiment, the back sheet 4 and the second layer 32) including the second layer extension portion 32E of the front sheet 3 on the outside in the transverse direction Y, and an area (hereinafter also referred to as a "standing area") that is not fixed to other components on the inside in the transverse direction Y and becomes a free portion 72. The free portion 72 of the cuff sheet 70 uses the fixing portion of the fixing portion 71, which is the innermost part of the skin opposite to the second layer extension portion 32E and is located in the transverse direction Y, as the base end portion 71P, and can move in the direction away from the front sheet 3.

[0054] To further explain, the inner end of the free portion 72 of the cuff sheet 70 in the transverse direction Y (the inner edge of the cuff sheet 70 along the longitudinal direction X) is fixed in an extended state in the longitudinal direction X by the cuff elastic component 73, and is configured to be able to stretch in this direction. In addition, in the present embodiment, the above-mentioned standing area is located in the crotch M and the respective parts of the ventral part F and the dorsal part R close to the crotch M, and the two ends of the longitudinal direction X of the leak-proof cuff 7 are standing obstruction parts that hinder the free portion 72 from standing up. That is, the above-mentioned standing area of ​​the cuff sheet 70 is sandwiched by the above-mentioned standing obstruction parts located at the two ends of the longitudinal direction X of the cuff sheet 70. The above-mentioned standing obstruction parts are typically formed by fixing the cuff sheet 70 to the skin-opposite surface (front sheet 3) of the absorbent body 2 using known joining means such as adhesives and welding. When the diaper 1 is worn, in the above-mentioned standing area of ​​the leak-proof cuff 7, the free portion 72 of the cuff sheet 70 uses the contraction force of the cuff elastic member 73 to stand up toward the skin side of the wearer (moving in the direction away from the front sheet 3) with the base end portion 71P as the standing starting point. This prevents urine and other excrement from flowing outward in the horizontal direction Y. In the illustrated embodiment, two cuff elastic members 73 are arranged in the free portion 72, but the number of cuff elastic members arranged is not particularly limited, and can be one or more than three. In addition, in Figure 2 In the figure, for the convenience of explanation, the leak-proof flange 7 is shown in an upright state, but in the Figure 1 In the diaper 1 in the unfolded and maximally stretched state shown, the leak-proof cuff 7 does not necessarily have to be as Figure 2 Stand up as shown.

[0055] In this embodiment, the diaper 1 includes a wing portion located outside the periphery of the absorbent body 5. The wing portion is composed of a member arranged so as to straddle the periphery of the absorbent body 5, and in this embodiment, includes a front sheet 3, a back sheet 4, an outer sheet 6, and a cuff sheet 70. Figure 1 As shown, the wing portion includes a ventral end piece 22 in addition to these pieces 3, 4, 6, 70 at the end of the longitudinal X on the ventral part F side of the diaper 1, and includes a dorsal end piece 23 in addition to these pieces 3, 4, 6, 70 at the end of the longitudinal X on the dorsal part R side of the diaper 1. The two pieces 22 and 23 are respectively used for the purpose of strengthening the diaper 1, leak-proofing, and fixing the elastic parts such as the waist elastic parts 9 described later, and are arranged between the front piece 3 (second layer 32) and the absorbent 5 (wrapping core 51). The two pieces 22 and 23 are hydrophobic, and can be used as the back piece 4. The multiple components constituting the wing portion are mutually bonded by known bonding means such as adhesives, heat sealing, and ultrasonic sealing. In addition, there may be no two pieces 22 and 23.

[0056] The side flaps 20 are located outside the side edges 5S, 5S of the absorber 5 and the imaginary extension lines of the side edges 5S in the transverse direction Y. The side flaps 20 extend over the entire length in the longitudinal direction X of the diaper 1.

[0057] In this embodiment, if Figure 1 As shown, the side wing portion 20 has a narrowed portion in the central area in the longitudinal direction X (the area located in the crotch M). The narrowed portion is a part of the diaper 1 arranged around the wearer's legs (leg periphery), and the leg periphery elastic component 8 is arranged in a manner that can stretch in the longitudinal direction X.

[0058] The side wing portion 20 includes a skin-side hydrophobic sheet arranged on the skin-opposite side of the front sheet 3 or the absorbent body 5, and a non-skin-side hydrophobic sheet arranged on the non-skin-opposite side of the absorbent body 5, and has a hydrophobic sheet overlapping portion 24 in which the skin-side hydrophobic sheet and the non-skin-side hydrophobic sheet are arranged opposite to each other between the absorbent body 5 and the outermost leg elastic component 8 arranged in the transverse direction Y.

[0059] In this embodiment, if Figure 1 As shown, the entire portion located outside the second layer extension portion 32E (side edge 32S of the second layer 32) in the transverse direction Y is the hydrophobic sheet overlapping portion 24. The hydrophobic sheet overlapping portion 24 extends in the longitudinal direction X over the entire length of the diaper 1.

[0060] In this embodiment, the skin-side hydrophobic sheet is a cuff sheet 70, a ventral end sheet 22, and a dorsal end sheet 23, and the non-skin-side hydrophobic sheet is a back sheet 4. These sheets 4, 22, 23, and 70 are all hydrophobic. The meaning of "hydrophobic" mentioned here is as described above. Under the premise that the skin-side hydrophobic sheet and the non-skin-side hydrophobic sheet are both hydrophobic, the contact angles measured by the above method may be the same or different.

[0061] In addition, in the present embodiment, the combination of sheets constituting the hydrophobic sheet overlap 24 (the combination of two hydrophobic sheets disposed relatively between the absorbent body 5 and the outermost leg-circumference elastic member 8 disposed in the transverse direction Y) is partially different. That is, the hydrophobic sheet overlap 24 is composed of the ventral end sheet 22 and the back sheet 4 at the end of the longitudinal X on the ventral portion F side of the diaper 1, and is composed of the back end sheet 23 and the back sheet 4 at the end of the longitudinal X on the back portion R side of the diaper 1, and is composed of the cuff sheet 70 and the back sheet 4 at the positions other than the above (the positions near the crotch M of the crotch M and the ventral portion F and the back portion R, respectively).

[0062] In the present invention, the combination of sheets constituting the hydrophobic sheet overlapping portion 24 may be the same over the entire length of the longitudinal direction X of the diaper 1 . An example of such a combination is a combination of the cuff sheet 70 and the back sheet 4 .

[0063] In this embodiment, if Figure 2 As shown, the leg elastic member 8 is disposed between the cuff sheet 70 (skin-side hydrophobic sheet) and the back sheet 4 (non-skin-side hydrophobic sheet). The leg elastic member 8 is fixed to the two sheets 4 and 70 by an adhesive at the portion of the side wing portion 20 disposed around the wearer's legs in a state of being stretched in the longitudinal direction X. Thus, when the diaper 1 is worn, the leg elastic member 8 contracts, and leg gathers are formed at the portion of the side wing portion 20 disposed around the wearer's legs, and this portion can be closely attached to the wearer's legs (thighs).

[0064] In the present embodiment, two leg elastic members 8 are disposed in each of the pair of side flaps 20, 20, but the number of leg elastic members 8 disposed in the side flaps 20 is not particularly limited, and may be one or three or more.

[0065] In the present embodiment, the leg elastic member 8 extends parallel to the longitudinal direction X (the extension direction coincides with the longitudinal direction X), but it is sufficient that it is configured to be stretchable in the longitudinal direction X. For example, it may be bent along the narrowed portion of the central region of the side wing portion 20 in the longitudinal direction X. In the present invention, if the angle formed by the extension direction of the leg elastic member 8 and the longitudinal direction X is 45 degrees or less, it can be said that the leg elastic member 8 is configured to be stretchable in the longitudinal direction X.

[0066] The leg elastic members 8 may be configured to be stretchable in the longitudinal direction X at least at the portions of the side wings 20 disposed around the legs of the wearer, and may be configured to be stretchable in other portions (e.g., portions of the ventral portion F and / or the dorsal portion R disposed around the waist) in the longitudinal direction X. For example, the leg elastic members 8 may be configured to be stretchable in the longitudinal direction X over the entire length of the diaper 1.

[0067] In the present embodiment, a plurality of waist elastic members 9 are arranged in a stretchable manner in the transverse direction Y at the above-mentioned wing portion at the end portion (dorsal waist end portion) of the dorsal portion R side of the diaper 1 in the longitudinal direction X, and these plurality of waist elastic members 9 are arranged at intervals in the longitudinal direction X. The waist elastic members 9 are fixed to the dorsal end sheet 23 by an adhesive in a state of being stretched in the transverse direction Y. Thus, when the diaper 1 is worn, the waist folds are formed at the portion of the diaper 1 arranged around the waist of the wearer by the contraction of the waist elastic members 9, and the diaper 1 can fit closely around the waist of the wearer. The above-mentioned wing portion at the end portion (ventral waist end portion) of the longitudinal direction X at the ventral portion F side of the diaper 1 can also be arranged with waist elastic members in the same manner as the dorsal portion R side.

[0068] The form of the elastic members 8, 9, 73 is not particularly limited. For example, elastic members in the form of lines or ropes (flat rubber, etc.) with rectangular, square, circular, polygonal, etc. cross-sections, or multifilament-type line-shaped elastic members can be used.

[0069] As one of the main features of the diaper 1, the following aspects can be cited: Figure 1 and Figure 2 As shown, in the hydrophobic sheet overlapping portion 24, there is a sealing portion 10 formed by joining the above-mentioned skin-side hydrophobic sheet (the cuff sheet 70, the ventral end sheet 22 or the dorsal end sheet 23 in this embodiment) and the above-mentioned non-skin-side hydrophobic sheet (the back sheet 4 in this embodiment), and the sealing portion 10 passes between the lateral extension portion of the above-mentioned front sheet and the outermost leg elastic component 8 arranged in the lateral direction Y, and is continuously arranged in the longitudinal direction X over the entire length of the diaper 1 in the longitudinal direction X.

[0070] In the present embodiment, the above-mentioned transverse extension portion of the front sheet is a part of the second layer 32 of the double-layer structure of the front sheet 3 (the second layer extension portion 32E), but in the present utility model, as described above, as long as it is "an extension portion in the front sheet that extends from the side edge along the longitudinal direction of the absorbent body to the outside in the transverse direction". The front sheet in the absorbent article of the present utility model can be a single-layer structure, or it can be a stacked structure of more than three layers. In the case where the front sheet is a single-layer structure, the above-mentioned transverse extension portion of the front sheet is an extension portion in the front sheet of the single-layer structure that extends from the side edge along the longitudinal direction of the absorbent body to the outside in the transverse direction. In addition, in the case where the front sheet is a stacked structure of more than two layers, the above-mentioned transverse extension portion of the front sheet can be composed of a layer that constitutes a part of the stacked structure as shown in the present embodiment, or it can also be composed of all the layers that constitute the stacked structure.

[0071] The means for joining the skin-side hydrophobic sheet and the non-skin-side hydrophobic sheet in the sealing portion 10 is not particularly limited, and may be an adhesive such as a hot melt adhesive, welding, etc. The joining of the two hydrophobic sheets based on welding can be performed, for example, by applying pressure in the thickness direction while overlapping the two hydrophobic sheets (specifically, the flap sheet 70 and the back sheet 4), and subjecting the two hydrophobic sheets to a material melting treatment such as a heating treatment or an ultrasonic treatment. Welding is particularly effective when at least one of the two hydrophobic sheets is mainly composed of a resin such as a thermoplastic resin.

[0072] As the bonding means, hot melt adhesive is preferred from the viewpoint of improving bonding strength and workability. The hot melt adhesive as the bonding means is preferably applied in a linear (beaded) manner along the extending direction (longitudinal direction X) of the sealing portion 10 .

[0073] As described above, in an absorbent article having a leak-proof cuff, since the wearer takes a lying sleeping posture, urine and other excreta are easily accumulated at the base end of the leak-proof cuff in the longitudinal central region (crotch) of the absorbent article, and there is a problem that the accumulated excreta spreads in the longitudinal direction through other components such as the front sheet connected to the leak-proof cuff at the base end, causing side leakage at the longitudinal end of the absorbent article. Therefore, in the diaper 1, there is also a concern that excreta accumulates at the base end 71P of the leak-proof cuff 7, and the accumulated excreta spreads in the longitudinal direction X through the front sheet 3, causing side leakage at the ventral part F and the dorsal part R.

[0074] However, in the diaper 1, as described above, the front sheet 3 has a portion overlapping with the absorbent body 5 when viewed from above, and has the above-mentioned front sheet transverse extension portion, and the base end portion 71P is provided at the front sheet transverse extension portion, so even if the wearer takes a sleeping posture lying horizontally, a relatively large amount of excrement flows to the base end portion 71P and stays, the excrement staying at the base end portion 71P is also absorbed by the absorbent body 5 via the front sheet transverse extension portion, so even if the excrement temporarily stays at the base end portion 71P, it is not easy to cause the excrement to stay for a long time. In addition, in the diaper 1, at an appropriate position on the outside of the transverse direction Y than the base end portion 71P, the sealing portion 10 formed by the two hydrophobic sheets constituting the hydrophobic sheet overlapping portion 24 is joined to each other, and is continuously formed in the longitudinal direction X over the entire length of the longitudinal direction X of the diaper 1, so that side leakage is not easy to occur in the longitudinal direction X of the diaper 1 as a whole.

[0075] In particular, in the present embodiment, the above-mentioned transverse extension of the front sheet is included in the second layer 32 having a relatively high hydrophilicity in the front sheet 3, and therefore, it is easy to present the above-mentioned "absorption function based on the absorbent 5 of the excrement present in the base end 71P via the transverse extension of the front sheet (the second layer 32)". In addition, as described above, since the above-mentioned transverse extension of the front sheet (the second layer extension 32E) is arranged in a pair on both sides of the transverse direction Y across the first layer 31, side leakage can be effectively prevented regardless of whether the wearer of the diaper 1 is lying on the right or on the left in a sleeping position.

[0076] In addition, in the present embodiment, as described above, the second layer 32 is composed of one sheet, and the two side edges 32S, 32S of the one sheet along the longitudinal direction X are located at a position outside the two side edges 5S, 5S of the absorbent body 5 along the longitudinal direction X in the transverse direction Y. Therefore, the above-mentioned "absorption function of the excrement present in the base end portion 71P by the transverse extension portion of the front sheet (second layer 32) based on the absorbent body 5" can be more reliably presented. The utility model includes "a mode in which the second layer 32 is composed of a first sheet and a second sheet arranged at a predetermined interval in the transverse direction Y, and the first sheet and the second sheet respectively have a second layer extension portion 32E", and compared with such a mode in which the second layer 32 is composed of a plurality of sheets arranged at intervals in the transverse direction Y, the side leakage prevention performance of the present embodiment is excellent.

[0077] In addition, as described above, the front sheet in the absorbent article of the present invention may be a single-layer structure. In this case, from the perspective of reliably presenting the above-mentioned excrement present at the base end of the leak-proof cuff via the absorbent function based on the lateral extension of the front sheet, the single-layer front sheet is preferably hydrophilic, that is, the contact angle measured by the above method is 90 degrees or less. From the same perspective, when the front sheet of the absorbent article of the present invention has a laminated structure of more than three layers, it is preferred that at least a part of the layers constituting the laminated structure is hydrophilic.

[0078] From the viewpoint of more reliably exerting the predetermined effect (side leakage prevention effect) of the present invention, the side edge 5S of the absorbent body 5 and the sealing portion 10 are spaced apart by a distance D1 in the transverse direction Y (see Figure 2 ) is preferably 12 mm or more, more preferably 15 mm or more, and further preferably 18 mm or more. When the absorbent body 5 is subjected to external pressure such as body pressure while absorbing and holding excrement, there is a situation where the excrement seeps out of the absorbent body 5. In order to reliably block the excrement seeping out from the absorbent body 5 by the sealing portion 10, it is preferred to set the lower limit of the spacing distance D1 within the above-mentioned preferred range to reduce the chance of the excrement contacting the sealing portion 10 as much as possible. On the other hand, if the spacing distance D1 is too long, the spacing distance in the lateral direction Y between the absorbent body 5 and the leg elastic member 8 will inevitably become longer, and as a result, there is a concern that the effect of the absorbent body 5 and the body of the wearer of the diaper 1 that is produced by the leg elastic member 8 will be reduced. In view of this, the upper limit of the spacing distance D1 is preferably 28 mm or less, more preferably 25 mm or less, and further preferably 23 mm or less.

[0079] Regarding the front sheet, in order to exert the prescribed effect of the utility model, as mentioned above, it is important that the front sheet has a portion overlapping with the absorbent body when viewed from above, and has the above-mentioned front sheet lateral extension portion. In addition, on this basis, it is preferred that the front sheet is hydrophilic (the contact angle of the front sheet is less than 90 degrees) (hereinafter, also referred to as "point 1"), and the front sheet is a double-layer structure (hereinafter, also referred to as "point 2"), in which the hydrophilicity of the second layer (the layer relatively far from the wearer's skin) is higher than the hydrophilicity of the first layer (the layer relatively close to the wearer's skin) (that is, the relationship of "the contact angle of the first layer>the contact angle of the second layer 32" is established) (hereinafter, also referred to as "point 3").

[0080] Regarding the above-mentioned point 1, when the front sheet 3 is hydrophobic (the contact angle of the front sheet is greater than 90 degrees), it becomes difficult for excrement to diffuse in the surface direction of the front sheet 3, so the excrement retained at the base end 71P of the leak-proof cuff 7 cannot be transferred to the absorbent body 5, and the excrement is easily accumulated at the base end 71P.

[0081] Regarding the above point 2, when the front sheet 3 is a single-layer structure, when the single-layer structure is hydrophobic, excrement is easily accumulated at the base end 71P for the same reason as above. In addition, when the single-layer structure of the front sheet 3 is hydrophilic, or there is no difference in the hydrophilicity of the two layers 31 and 32, when the pressure such as the body pressure of the wearer is applied to the absorbent body 5 and the absorbent body 5 is pressurized, so-called backflow (a phenomenon in which excrement temporarily absorbed and retained in the absorbent body 5 seeps out to the skin-opposite side of the front sheet 3) occurs, and the excrement of the backflow may leak sideways.

[0082] Regarding the above point 3, when the hydrophilicity of the first layer 31 is higher than that of the second layer 32, the excretions discharged to the skin-facing surface of the first layer 31 may not be absorbed by the second layer 32 and may leak sideways.

[0083] From the perspective of more reliably exerting the effects of the above-mentioned utility model, the contact angles of the first layer 31 and the second layer 32 constituting the front sheet 3 are preferably set as follows, based on the premise that the relationship "contact angle of the first layer 31 > contact angle of the second layer 32" is established.

[0084] The contact angle of the first layer 31 is preferably 75 degrees or more, more preferably 78 degrees or more, and is preferably 90 degrees or less, more preferably 87 degrees or less.

[0085] The contact angle of the second layer 32 is preferably 60 degrees or more, more preferably 65 degrees or more, and is preferably 85 degrees or less, more preferably 80 degrees or less.

[0086] The hydrophilicity of the first layer 31 and the second layer 32 can be adjusted by the type of constituent fibers, the use of a hydrophilizing agent and / or a hydrophobizing agent, and the like.

[0087] Regarding the sealing portion 10, in order to exert the prescribed effect of the utility model, as described above, it is important that the sealing portion 10 passes between the above-mentioned lateral extension portion of the front sheet (in the present embodiment, the second layer extension portion 32E (the side edge 32S of the second layer 32)) and the outermost leg elastic component 8 arranged in the lateral direction Y (hereinafter also referred to as "point 4"), and the sealing portion 10 is continuously formed in the longitudinal direction X over the entire length of the diaper 1 (hereinafter also referred to as "point 5").

[0088] Regarding the above-mentioned point 4, according to the view of the present inventor, the closer the sealing portion 10 is to the side edge along the longitudinal direction X of the transverse extension portion of the above-mentioned front sheet in the transverse direction Y (the side edge 32S of the second layer 32 (the second layer extension portion 32E) in this embodiment), the higher the closeness of the hydrophobic sheets joined by the sealing portion 10 (the hem sheet 70, the ventral end sheet 22 or the back end sheet 23 and the back sheet 4 in this embodiment), the more the effect of preventing side leakage is improved. On the other hand, when the sealing portion 10 is located on the outside of the transverse direction Y than the leg elastic member 8 disposed on the outermost side in the transverse direction Y, even if the sealing portion 10 is continuously formed over the entire length of the longitudinal direction X of the diaper 1, the effect of preventing side leakage cannot be fully exerted.

[0089] From the perspective of further improving the side leakage prevention effect, the distance D2 (refer to Figure 2 ) is preferably more than 1mm, more preferably more than 2mm, and further preferably more than 3mm.When being subjected to external pressures such as body pressure under the state that absorber 5 absorbs and keeps excreta, there is the situation that this excreta oozes out to the outside of absorber 5 and diffuses via front sheet 3 (above-mentioned front sheet lateral extension portion), in order to utilize sealing portion 10 to reliably block the excreta diffused from absorber 5 via front sheet 3 like this, it is preferred that the lower limit of spacing distance D2 is set to the above-mentioned preferred range, reduce the chance of excreta contacting with sealing portion 10 as much as possible.On the other hand, if spacing distance D2 is too long, then the spacing distance of the lateral Y of absorber 5 and leg circumference elastic member 8 is inevitably lengthened, and as a result, it is worried that the effect of making absorber 5 and the body of the wearer of diaper 1 fit together that leg circumference elastic member 8 brings is reduced.In view of this, the upper limit of spacing distance D2 is preferably below 10mm, more preferably below 7mm, and further preferably below 5mm.

[0090] In this embodiment, if Figure 2As shown, the base end 71P of the leak-proof cuff 7 (the position in the fixing part 71 that becomes the starting point when the leak-proof cuff 7 stands up) exists at a position away from the side edge 32S of the second layer extension part 32E (the above-mentioned front sheet lateral extension part) to the inner side of the lateral direction Y (close to the lateral center line CLy of the diaper 1) by a distance D3. In the utility model, the form in which the spacing distance D3 is zero, that is, the base end 71P overlaps the side edge 32S of the front sheet 3 in the thickness direction, but from the viewpoint of further improving the side leakage prevention effect, the spacing distance D3 is preferably greater than zero. The spacing distance D3 is preferably more than 3mm, more preferably more than 5mm, and more preferably more than 8mm. On the other hand, if the spacing distance D3 is too long, the spacing distance of the absorbent body 5 and the lateral direction Y of the leg elastic member 8 will inevitably become longer, and as a result, it is worried that the effect of the leg elastic member 8 on the fit of the absorbent body 5 to the body of the wearer of the diaper 1 will be reduced. In consideration of this point, the upper limit of the spacing distance D3 is preferably 20 mm or less, more preferably 15 mm or less, and further preferably 13 mm or less.

[0091] In the present invention, the sealing portion 10 is formed continuously in the longitudinal direction X over the entire length of the diaper 1 through the lateral extension portion of the front sheet and the outermost leg elastic member 8 arranged in the lateral direction Y. Alternatively, the sealing portion 10 may be formed continuously in the lateral direction Y from the base end portion 71P of the leak-proof cuff 7 on the outer side. In other words, the distance (in the lateral direction Y) from the base end portion 71P is Figure 2 In the manner shown, the spacing distance D2+D3) may also be zero. However, from the perspective of preventing side leakage, it is preferred to Figure 2 In the embodiment shown, the sealing portion 10 is discontinuous with the base end portion 71P. By discontinuously arranging the sealing portion 10 in the lateral direction Y relative to the base end portion 71P where excrement is likely to accumulate, the chance of excrement contacting the sealing portion 10 is further reduced, and the side leakage prevention effect can be further improved.

[0092] As one of the preferred modes with excellent side leakage prevention effect, there can be cited a mode in which the sealing portion 10 passes between the lateral extension portion of the front sheet and the innermost leg elastic member 8 arranged in the lateral direction Y. This embodiment is the preferred mode. Figure 2 As shown, the sealing portion 10 passes between the second layer extension portion 32E (the above-mentioned transverse extension portion of the front sheet) and the innermost leg elastic member 8 arranged in the transverse direction Y, and does not overlap with the leg elastic member 8 in the thickness direction.

[0093] As another preferred mode with excellent side leakage prevention effect, at least a part of the sealing part 10 overlaps with the leg elastic member 8 (particularly the innermost leg elastic member 8 arranged in the transverse direction Y) which is telescopically arranged in the longitudinal direction X. According to this mode, due to the stress of the leg elastic member 8, the closeness of the part of the diaper 1 corresponding to the sealing part 10 relative to the skin of the wearer of the diaper 1 is improved, thereby achieving an excellent side leakage prevention effect. In addition, if the proportion of the overlapping part with the sealing part 10 in the leg elastic member 8 is too large, it is possible to hinder the elasticity of the leg elastic member 8. Therefore, in the cross-sectional view along the direction orthogonal to the extension direction (longitudinal direction X) of the leg elastic member 8, it is preferred to avoid the entire area of ​​the peripheral surface of the leg elastic member 8 from overlapping with the sealing part 10, and only a part of the peripheral surface of the leg elastic member 8 (for example, the inner side of the transverse direction Y) is overlapped with the sealing part 10.

[0094] Regarding the above-mentioned point 5, the term "continuous" as used herein includes a completely continuous form in which there is no discontinuous portion in the sealing portion 10 over the entire length of the longitudinal direction X of the diaper 1, and a form in which there is a small discontinuous portion in the sealing portion 10 but the entire length of the longitudinal direction X of the diaper 1 is substantially continuous. Even in the latter form, side leakage can be effectively prevented. In the latter form, the length of the discontinuous portion in the longitudinal direction X is preferably 5 mm or less, more preferably 3 mm or less, and even more preferably 0 mm.

[0095] The side leakage prevention performance of the absorbent article can be evaluated by the following method. The various technical findings described in this specification, represented by the above-mentioned points 1 to 5, are obtained by appropriately using the following side leakage prevention performance evaluation method.

[0096] <Evaluation method of side leakage prevention performance>

[0097] The absorbent article to be evaluated is expanded into a flat surface and fixed to a fixing plate with a smooth surface (e.g., a plate made of acrylic resin). At this time, the absorbent article is fixed in such a manner that the skin-facing side (front sheet side) of the absorbent article is exposed and the non-skin-facing side is opposite to the fixing plate. The fixing plate to which the absorbent article is fixed is made to have the fixing surface of the absorbent article as the upper surface, and is tilted 45 degrees around the transverse center line of the absorbent article (equivalent to the imaginary straight line of the transverse center line CLy of the diaper 1), so that the upper surface is an inclined surface with an inclination angle of 45 degrees, and the fixing plate is fixed in this state. 30 g of physiological saline (0.9 mass % saline) colored with a dye is injected at an injection rate of 5 g / sec at the center of the skin-facing side of the absorbent article. After 5 minutes from the start of the injection of the physiological saline, the above-mentioned 30 g of the physiological saline is injected into the above-mentioned absorbent article in the same manner as above. After the injection operation of the physiological saline was carried out three times (i.e., a total of 90 g of physiological saline was injected), the side portions of the absorbent article located below the above-mentioned inclined surface on both sides along the longitudinal direction were visually observed to evaluate the degree of retention of the physiological saline at the base end of the leak-proof cuff, the presence of side leakage, etc.

[0098] The leg elastic member 8 preferably has no stretchability in a portion other than the portion of the diaper 1 disposed around the wearer's legs (hereinafter also referred to as the "leg portion"). In other words, the leg elastic member 8 preferably has stretchability only in the leg portion. The leg portion is typically the central region of the side wing 20 in the longitudinal direction X, or the region of the side wing 20 located in the crotch M. Therefore, the leg elastic member 8 preferably has no stretchability in the front and rear end regions of the side wing 20 in the longitudinal direction X, or the region of the side wing 20 located in the ventral portion F and the dorsal portion R.

[0099] The leg elastic member 8 is a member configured for main purpose with the conformability of the leg of the wearer of diaper 1 being improved, so as long as it is configured telescopically at the leg, it is not necessary to be configured to be telescopic at the position outside the leg. On the other hand, in diaper 1, sealing part 10 passes through near the leg elastic member 8, and extends over the full length of the longitudinal direction X of diaper 1, assuming that the position (hereinafter, also referred to as "waist portion") configured at the waist of the wearer in diaper 1, the leg elastic member 8 with telescopicity is configured near the sealing part 10, then due to the influence of the stress of the leg elastic member 8 etc., it is worried that the conformability of the waist portion with respect to the health of the wearer may be reduced. Therefore, from the viewpoint of eliminating this worry, it is preferred that the leg elastic member 8 does not have telescopicity at the position outside the leg.

[0100] The leg elastic member 8 having stretchability only around the leg may be, for example: 1) a member arranged only around the leg and having stretchability over the entire length in the longitudinal direction X, or 2) a member having an extension extending from the leg to the outside in the longitudinal direction X, and having stretchability in the portion arranged around the leg, but the extension is not stretchable. In the leg elastic member 8, the portion fixed to other members in an extended state has stretchability in the extension direction thereof.

[0101] The absorbent article of the present invention is not limited to the unfolded disposable diapers as in the above-mentioned embodiment, but widely includes articles for absorbing body fluids (urine, menstrual blood, soft stools, sweat, etc.) discharged from the human body, and also includes shorts-type disposable diapers, sanitary napkins, sanitary shorts, etc. that do not have a fixing structure such as the fixing part 21.

[0102] As mentioned above, although this invention was demonstrated based on the preferred embodiment, the absorbent article of this invention is not limited at all by the said embodiment, It can change suitably. All the parts which only one embodiment mentioned above has can be utilized mutually suitably.

[0103] For example, the leakage-barrier cuff 7 may not include the cuff elastic member 73. That is, the leakage-barrier cuff 7 may not be configured to stand up toward the wearer's skin due to the contraction of the elastic member disposed on the cuff sheet 70.

[0104] In the case where the front sheet 3 (first layer 31) has a concavoconvex shape on the skin-opposite surface, the concavoconvex pattern (the shape and configuration of the convex portion 33) is not particularly limited, and any pattern can be appropriately selected within the scope of the main purpose of the utility model. For example, the top view shape of the convex portion 33 can be a polygonal shape of a circle, an ellipse, a triangle, a quadrilateral or more. In addition, as an example of the above-mentioned concavoconvex pattern, a plurality of convex portions 33 can be arranged in a staggered shape, and the surrounding of each convex portion 33 becomes a concave portion. As another example of the above-mentioned concavoconvex pattern, a first concave portion extending in a first direction intersecting the longitudinal and transverse directions and a second concave portion extending in a second direction intersecting the first direction can be exemplified, which is arranged in a lattice shape, and a plurality of partitions surrounded by the two concave portions are respectively provided with a convex portion 33. As another example of the above-mentioned concavoconvex pattern, a convex portion 33 extending in the longitudinal or transverse direction as a ridge portion and a concave portion extending in the direction as a groove portion can be exemplified, and the convex portion 33 is alternately arranged in a direction orthogonal to their extending direction.

[0105] The following additional remarks are further disclosed regarding the above-mentioned embodiments of the present invention.

[0106] <1>

[0107] An absorbent article, which has a longitudinal direction extending from the wearer's ventral side to the back side through the crotch part and a lateral direction orthogonal to the longitudinal direction, and has a crotch part arranged at the crotch part when worn, a ventral part arranged at a position closer to the wearer's ventral side than the crotch part, and a dorsal part arranged at a position closer to the wearer's back side than the crotch part, and includes: an absorbent body for absorbing and retaining body fluids; a front sheet arranged on the skin-opposite side of the absorbent body; a pair of leak-proof cuffs extending in the longitudinal direction and arranged in a manner covering the two side portions of the front sheet along the longitudinal direction; and a pair of side wing parts extending from the two side edges of the absorbent body along the longitudinal direction to the outside of the lateral direction, wherein the parts of the side wing parts arranged around the wearer's legs are provided with leg elastic components in a manner that can be stretched and contracted in the longitudinal direction, wherein:

[0108] The front sheet has a portion overlapping the absorbent body in a plan view, and has an extension portion extending from a side edge of the absorbent body along the longitudinal direction toward the outer side in the lateral direction.

[0109] The anti-leakage cuff includes a hydrophobic cuff sheet, which has a region at least in the crotch portion where the outer side in the transverse direction becomes a fixed portion fixed to other components and the inner side in the transverse direction becomes a free portion not fixed to other components.

[0110] The side wing portion includes a skin-side hydrophobic sheet arranged on the skin-opposing side of the front sheet or the absorbent body, and a non-skin-side hydrophobic sheet arranged on the non-skin-opposing side of the absorbent body, and between the absorbent body and the leg elastic member arranged on the outermost side in the transverse direction, there is a hydrophobic sheet overlapping portion in which the skin-side hydrophobic sheet and the non-skin-side hydrophobic sheet are arranged opposite to each other, and the hydrophobic sheet overlapping portion extends in the longitudinal direction over the entire length of the absorbent article,

[0111] In the overlapping portion of the hydrophobic sheets, there is a sealing portion where the skin-side hydrophobic sheet and the non-skin-side hydrophobic sheet are joined. The sealing portion passes between the extension portion of the front sheet and the leg elastic component arranged at the outermost side in the transverse direction, and is continuously formed in the longitudinal direction over the entire longitudinal length of the absorbent article.

[0112] <2>

[0113] The absorbent article as described in <1> above, wherein:

[0114] The sealing portion passes between the extended portion of the top sheet and the leg elastic member disposed on the innermost side in the transverse direction.

[0115] <3>

[0116] The absorbent article as described in <1> or <2> above, wherein:

[0117] The surface sheet has a laminated structure in which a plurality of layers are laminated in the thickness direction.

[0118] <4>

[0119] The absorbent article as described in <3> above, wherein:

[0120] The front sheet includes: a first layer disposed on a side relatively close to the wearer's skin; and a second layer disposed overlapping the non-skin-opposite side of the first layer and having a higher hydrophilicity than the first layer.

[0121] The second layer has a portion overlapping the absorbent body in a plan view, and has a second layer extension portion extending from a side edge of the first layer along the longitudinal direction toward an outer side in the lateral direction.

[0122] The second layer extension portions are arranged on both sides of the first layer in the lateral direction.

[0123] <5>

[0124] The absorbent article as described in <4> above, wherein:

[0125] The contact angle of the first layer with water is 75 degrees or more and 90 degrees or less, preferably 78 degrees or more and 87 degrees or less.

[0126] The contact angle of the second layer with water is 60 degrees or more and 85 degrees or less, preferably 65 degrees or more and 80 degrees or less.

[0127] <6>

[0128] The absorbent article as described in <4> or <5> above, wherein:

[0129] The second layer is composed of a single sheet, and both side edges of the single sheet along the longitudinal direction are located outside in the transverse direction relative to both side edges of the absorbent body along the longitudinal direction.

[0130] <7>

[0131] The absorbent article according to any one of <4> to <6> above, wherein:

[0132] The first layer and the second layer each comprise a nonwoven fabric,

[0133] A plurality of convex portions that protrude toward the skin of the wearer are dispersedly formed on the skin-facing surface of the first layer.

[0134] <8>

[0135] The absorbent article according to any one of <1> to <7>, wherein:

[0136] The distance (D1) between the side edge of the absorbent body along the longitudinal direction and the sealing portion in the transverse direction is preferably 28 mm or less, more preferably 25 mm or less, and further preferably 23 mm or less.

[0137] <9>

[0138] The absorbent article according to any one of <1> to <8> above, wherein:

[0139] The distance (D2) between the extended portion and the sealed portion of the front sheet in the transverse direction is preferably 10 mm or less, more preferably 5 mm or less, and even more preferably 3 mm or less.

[0140] <10>

[0141] The absorbent article according to any one of <1> to <9>, wherein:

[0142] The base end portion of the fixing portion, which is the starting point of the rising of the leakage-barrier cuff, is located at a position away from the side edge of the extending portion of the front sheet along the longitudinal direction toward the inside in the transverse direction by a predetermined distance (D3).

[0143] <11>

[0144] The absorbent article according to any one of <1> to <10>, wherein:

[0145] At least a portion of the sealing portion overlaps with the leg elastic member.

[0146] <12>

[0147] The absorbent article according to any one of <1> to <11>, wherein:

[0148] The leg elastic members are not stretchable at locations other than the locations of the side flaps disposed around the legs of the wearer.

[0149] Industrial Applicability

[0150] According to the utility model, an absorbent article with excellent side leakage prevention performance is provided.

Claims

1. An absorbent article having a longitudinal direction extending from the wearer's ventral side to the back side via a crotch portion and a lateral direction orthogonal to the longitudinal direction, and having a crotch portion arranged at the crotch portion when worn, an ventral portion arranged at a position closer to the wearer's ventral side than the crotch portion, and a back portion arranged at a position closer to the wearer's back side than the crotch portion, and comprising: Absorbents that hold body fluids; A front sheet disposed on the skin-opposing side of the absorbent body; A pair of anti-leakage cuffs extending in the longitudinal direction and arranged in a manner covering both side portions of the front sheet along the longitudinal direction; and a pair of side wings extending outward in the transverse direction from both side edges of the absorbent body along the longitudinal direction, wherein a leg elastic member is arranged at a portion of the side wings arranged around the legs of the wearer in a manner that can be stretched in the longitudinal direction, wherein the absorbent article is characterized in that: The front sheet has a portion overlapping the absorbent body in a plan view, and has an extension portion extending from a side edge of the absorbent body along the longitudinal direction toward the outer side in the lateral direction. The anti-leakage cuff includes a hydrophobic cuff sheet, and the cuff sheet has a region at least in the crotch portion where the outer side in the transverse direction becomes a fixed portion to be fixed and the inner side in the transverse direction becomes a free portion to be not fixed. The side wing portion includes a skin-side hydrophobic sheet arranged on the skin-opposing side of the front sheet or the absorbent body, and a non-skin-side hydrophobic sheet arranged on the non-skin-opposing side of the absorbent body, and between the absorbent body and the leg elastic member arranged on the outermost side in the transverse direction, there is a hydrophobic sheet overlapping portion in which the skin-side hydrophobic sheet and the non-skin-side hydrophobic sheet are arranged opposite to each other, and the hydrophobic sheet overlapping portion extends in the longitudinal direction over the entire length of the absorbent article, In the overlapping portion of the hydrophobic sheet, there is a sealing portion where the skin-side hydrophobic sheet and the non-skin-side hydrophobic sheet are joined, and the sealing portion passes between the extension portion of the front sheet and the leg elastic component arranged at the outermost side in the transverse direction, and is continuously formed in the longitudinal direction over the entire length of the absorbent article. The leg elastic member is arranged so as to be interposed between the skin-side hydrophobic sheet and the non-skin-side hydrophobic sheet constituting the hydrophobic sheet overlapping portion. The front sheet has a laminated structure in which a plurality of layers are laminated in the thickness direction, and The front sheet includes: a first layer arranged on a side relatively close to the wearer's skin; and a second layer which is arranged to overlap with the non-skin facing surface of the first layer and has a higher hydrophilicity than the first layer, The second layer has a portion overlapping the absorbent body in a plan view, and has a second layer extension portion extending from a side edge of the first layer along the longitudinal direction toward an outer side in the lateral direction. The second layer extension portions are arranged on both sides of the first layer in the lateral direction.

2. The absorbent article according to claim 1, wherein: The sealing portion passes between the extended portion of the top sheet and the leg elastic member disposed on the innermost side in the transverse direction.

3. The absorbent article according to claim 1 or 2, characterized in that: The contact angle of the first layer with water is 75 degrees or more and 90 degrees or less, and the contact angle of the second layer with water is 60 degrees or more and 85 degrees or less.

4. The absorbent article according to claim 1 or 2, characterized in that: The second layer is composed of a single sheet, and both side edges of the single sheet along the longitudinal direction are located outside in the transverse direction relative to both side edges of the absorbent body along the longitudinal direction.

5. The absorbent article according to claim 1 or 2, characterized in that: The first layer and the second layer each comprise a nonwoven fabric, A plurality of convex portions that protrude toward the skin of the wearer are dispersedly formed on the skin-facing surface of the first layer.

6. The absorbent article according to claim 1 or 2, characterized in that: A distance between the side edge of the absorbent body along the longitudinal direction and the sealing portion in the transverse direction is 28 mm or less.

7. The absorbent article according to claim 1 or 2, characterized in that: The extending portion of the front sheet and the sealing portion are spaced apart from each other by a distance of less than 10 mm in the transverse direction.

8. The absorbent article according to claim 1 or 2, characterized in that: The base end portion of the fixing portion, which is a starting point when the leakage-barrier cuff is raised, is located at a position away from the side edge of the extension portion of the front sheet along the longitudinal direction toward the inside in the transverse direction by a predetermined distance.

9. The absorbent article according to claim 1 or 2, characterized in that: At least a portion of the sealing portion overlaps with the leg elastic member.

10. The absorbent article according to claim 1 or 2, characterized in that: The sealing portion and the leg elastic member do not overlap in the thickness direction.

11. The absorbent article according to claim 1 or 2, characterized in that: In the sealing portion, the skin-side hydrophobic sheet and the non-skin-side hydrophobic sheet are bonded by an adhesive, and the adhesive is applied in a linear shape along an extending direction of the sealing portion.

12. The absorbent article according to claim 1 or 2, characterized in that: The leg elastic members are not stretchable at locations other than the locations of the side flaps disposed around the legs of the wearer.

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