Disposable diapers

Abstract

The present invention aims to provide a disposable diaper that can suppress deformation of an absorbent body caused by the wearer walking, etc., and eliminate the discomfort felt by the wearer when wearing the disposable diaper. The above-mentioned problem is solved by the following solution means: in the absorbent body, first slits (40A, 40B) are provided in parallel with the first inclined portion at a predetermined interval on both sides of the width direction of the abdomen and the front of the crotch, a second slit (41) is provided in parallel with the straight portion at the center of the width direction of the middle portion of the crotch, third slits (42A, 42B) are provided in the width direction of both sides of the rear portion of the crotch at a predetermined interval, and the rear end portion is located outside the front end portion in the width direction, and a fourth slit (43A, 43B) is provided in parallel with the second inclined portion in the middle portion of the back in the width direction, the rear end portion of the first slit is located inside the straight portion in the width direction, and the front end portion of the fourth slit is located at a predetermined interval in the longitudinal direction from the rear end portion of the third slit.

Description

Technical Field

[0001] The present invention relates to a pants-type disposable diaper, and more particularly to an absorbent body of an inner body of the disposable diaper. Background Art

[0002] In the past, in order to reduce the discomfort felt by the wearer when wearing disposable diapers, the following means are known: slits extending in the longitudinal direction are provided on both sides of the width direction of the crotch of the absorbent body, and a slit extending in the width direction from the front end of the slit along the groin area toward the front side is provided on the abdomen of the absorbent body (Patent Document 1).

[0003] Furthermore, in order to suppress deformation of the absorber caused by the wearer walking, for example, there is known a method of providing slits extending outward in the width direction at predetermined intervals in the abdomen of the absorber (Patent Document 1).

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2019-216956

[0007] Patent Document 2: Japanese Patent Application Laid-Open No. 2020-65817 Summary of the Invention

[0008] Problems to be solved by the invention

[0009] However, the method of Patent Document 1 cannot suppress deformation of the back of the absorber caused by the wearer walking, and the slits cannot sufficiently suppress large deformation in the crotch of the absorber, so the wearer's discomfort may not be fully reduced.

[0010] In addition, like the method of Patent Document 1, the method of Patent Document 2 cannot suppress the deformation of the back of the absorbent body caused by the wearer walking, etc., and the use of slits cannot fully suppress the large deformation caused by the crotch of the absorbent body, so it may not be possible to fully reduce the wearer's discomfort.

[0011] Therefore, an object of the present invention is to provide a disposable diaper that can suppress deformation of the abdomen, crotch, and back of the absorber caused by the wearer walking, etc., and can eliminate the discomfort felt by the wearer when wearing the disposable diaper.

[0012] Means for solving problems

[0013] Means for solving the above-mentioned problems are as follows.

[0014] The first means is characterized in that: an inner body is formed with an absorbent body provided between a liquid-permeable surface sheet and a liquid-impermeable back sheet, an outer body that can be stretched and contracted in the width direction is fixed to the opposite side of the body of the above-mentioned inner body, and when observed from above, the above-mentioned absorbent body is formed by a rectangular abdomen opposite to the wearer's abdominal part, a rectangular back opposite to the wearer's dorsal part, and a crotch connecting the above-mentioned abdomen and back, a first inclined portion extending from the front side to the inner side of the width direction of the back side is formed on both sides in the width direction of the front part of the above-mentioned crotch, a second inclined portion extending from the back side to the inner side of the width direction of the front side is formed on both sides in the width direction of the back part of the above-mentioned crotch, and a second inclined portion extending from the back side to the inner side of the width direction of the front side is formed on both sides in the width direction of the middle part of the above-mentioned crotch The straight portion extends from the front end of the oblique portion, and a first slit parallel to the first oblique portion is provided at a prescribed interval on both sides of the width direction of the front portion of the above-mentioned abdomen and crotch portion, a second slit parallel to the above-mentioned straight portion is provided in the central portion of the width direction of the middle portion of the above-mentioned crotch portion, and a third slit with a rear end located outside the width direction of the front end is provided at a prescribed interval on both sides of the width direction of the rear portion of the above-mentioned crotch portion, and a fourth slit parallel to the above-mentioned second oblique portion is provided crosswise in the middle portion of the width direction of the above-mentioned back, the rear end of the above-mentioned first slit is located inside the width direction of the above-mentioned straight portion, and the front end of the fourth slit is located at a position spaced a prescribed interval longitudinally from the rear end of the above-mentioned third slit.

[0015] The second means is characterized in that, in the configuration of the first means, the intersection of the fourth slit is located at the center in the width direction of the back portion, and the length of the fourth slit at the rear side of the intersection is formed to be longer than the length of the fourth slit at the front side of the intersection.

[0016] The third means is characterized in that, in the configuration of the first or second means, the interval between the second slits in the short axis direction is formed to be larger than the interval between the first slit, the third slit, and the fourth slit in the short axis direction.

[0017] A fourth means is characterized in that, in the configuration of any one of the first to third means, a front end portion of the third slit is connected to a rear end portion of the second slit.

[0018] The fifth means is characterized in that, in the configuration of any one of the first to fourth means, an elastic member capable of stretching and contracting in the width direction is provided at least at one location on the side of the absorbent body opposite to the body, facing the first slit, the second slit, the third slit, and the fourth slit.

[0019] Effects of the Invention

[0020] According to the first means, an inner body is formed with an absorbent body provided between a liquid-permeable surface sheet and a liquid-impermeable back sheet, and an outer body that can be stretched and contracted in the width direction is fixed to the opposite side of the inner body to the body. When viewed from above, the absorbent body is formed by a rectangular abdomen opposite to the wearer's abdominal part, a rectangular back opposite to the wearer's dorsal part, and a crotch connecting the abdomen and the back. First inclined portions extending from the front side to the inner side of the width direction of the back side are formed on both sides in the width direction of the front part of the crotch, second inclined portions extending from the back side to the inner side of the width direction of the front side are formed on both sides in the width direction of the back part of the crotch, straight portions extending from the rear end portion of the first inclined portion to the front end portion of the second inclined portion are formed on both sides in the width direction of the middle part of the crotch, and straight portions extending from the rear end portion of the first inclined portion to the front end portion of the second inclined portion are formed on both sides in the width direction of the front part of the abdomen and the crotch. The first inclined portion is provided with first slits parallel to the first inclined portion at predetermined intervals. A second slit is provided parallel to the straight portion in the widthwise center of the middle portion of the crotch portion. Third slits are provided on both sides of the rear crotch portion in the widthwise direction at predetermined intervals, with rear ends positioned widthwise outward of the front end. A fourth slit is provided in the widthwise middle portion of the back portion, parallel to the second inclined portion, with the rear end of the first slit positioned widthwise inward of the straight portion, and the front end of the fourth slit positioned longitudinally at predetermined intervals from the rear end of the third slit. This narrowing of the first to fourth slits suppresses deformation of the absorbent body caused by forces applied to the absorbent body by the wearer walking, thereby alleviating discomfort experienced by the wearer when wearing the disposable diaper. Furthermore, this prevents excretion such as urine from the absorbent body from being discharged to the outside through the rear end of the third slit.

[0021] According to the second means, in addition to the effect of the first means, since the intersection of the fourth slit is located at the center of the width direction of the back, the length of the fourth slit on the rear side of the intersection is formed to be longer than the length of the fourth slit on the front side of the intersection, thereby enabling the back of the absorbent body to effectively fit the back of the wearer.

[0022] According to the third means, in addition to the effects of the first or second means, since the spacing of the second slit in the short axis direction is formed to be larger than the spacing of the first slit, the third slit and the fourth slit in the short axis direction, the deformation of the crotch of the absorbent body which produces the maximum deformation when the wearer walks, etc. can be further suppressed.

[0023] According to the fourth means, in addition to the effects of any one of the first to third means, since the front end of the third slit is connected to the rear end of the second slit, deformation of the crotch portion of the absorber, which deforms most when the wearer walks, can be further suppressed.

[0024] According to the fifth means, in addition to the effects of any one of the means 1 to 4, since an elastic component that can be stretched and contracted in the width direction is provided at least at one portion on the opposite side of the absorbent body to the first slit, the second slit, the third slit and the fourth slit, the first to fourth slits can be effectively narrowed. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a top view of the body-facing side of a disposable diaper.

[0026] Figure 2 This is a top view of the side of the disposable diaper facing away from the body.

[0027] Figure 3 yes Figure 1 AA cross-section diagram.

[0028] Figure 4 yes Figure 1 BB cross-section diagram.

[0029] Figure 5 yes Figure 1 CC cross-section diagram.

[0030] Figure 6 It is a top view of the body surface side of the absorbent body of the first embodiment.

[0031] Figure 7 It is a top view of the body surface side of the absorbent body of the second embodiment.

[0032] Figure 8 It is a top view of the body surface side of the absorbent body of the third embodiment.

[0033] Figure 9 It is a top view of the body surface side of the absorbent body of the fourth embodiment.

[0034] Figure 10 (a) is a partial cross-sectional plan view of the body-facing side of the exterior body, and (b) is an AA cross-sectional view of (a). DETAILED DESCRIPTION

[0035] like Figure 1 、 Figure 2 As shown, the disposable diaper is formed of an inner body 10 and an outer body 20 fixed to the inner body 10 on the side opposite to the body.

[0036] <Inner body>

[0037] like Figures 3-5As shown, the inner body 10 is formed by a liquid-permeable surface sheet 11 provided on the body side, a liquid-impermeable back sheet 12 provided on the opposite side of the body, an absorption unit 13 provided between the surface sheet 11 and the back sheet 12, and three-dimensional pleats 16 provided on both sides of the inner body 10 in the width direction.

[0038] The widthwise sides of the topsheet 11 extend along the sides of the backsheet 12 and the absorbent element 13 and to the side opposite to the body of the absorbent element 13. The longitudinal sides of the topsheet 11 extend beyond the sides of the absorbent element 13.

[0039] As the surface sheet 11, preferably a non-woven fabric with or without holes, a porous plastic sheet, etc. The material fiber constituting the non-woven fabric can be a synthetic fiber such as an olefin-based fiber such as polyethylene or polypropylene, a polyester-based fiber, a polyamide-based fiber, a regenerated fiber such as rayon, cuprammonium rayon, or a natural fiber such as cotton. Non-woven fabrics obtained by appropriate processing methods such as spunlace, spunbond, heat-bond, melt-blown, and needle-punch can be used. Among these processing methods, spunlace is excellent in terms of softness and drape, while heat-bond is excellent in terms of bulk and softness. When a large number of through-holes are formed on the surface sheet 11, urine, etc. are quickly absorbed, and the dryness is excellent.

[0040] The both sides of the back sheet 12 in the width direction are folded back toward the side opposite to the body and extend to the outer sides of the absorption unit 13. In addition, the both sides of the back sheet 12 in the longitudinal direction extend beyond the both sides of the absorption unit 13.

[0041] As the back sheet 12, a liquid-impermeable plastic sheet such as polyethylene or polypropylene is used. In recent years, a moisture-permeable sheet has been preferred to prevent dampness. The water-impermeable and moisture-permeable sheet is, for example, a microporous sheet obtained by forming a sheet by melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene and then stretching it in a uniaxial or biaxial direction.

[0042] The absorption unit 13 is formed of an absorbent body 14 and a packaging sheet 15 covering the absorbent body 14. In the expanded state, the absorption unit 13 is formed in a rectangular shape.

[0043] The absorbent body 14 is formed by an abdominal portion 14A corresponding to the wearer's ventral side, a crotch portion 14B corresponding to the wearer's crotch, and a back portion 14C corresponding to the wearer's dorsal side. The dimensions of the abdominal portion 14A, crotch portion 14B, and back portion 14C can be appropriately set according to the wearer's body shape, etc. Preferably, the length of the narrowest width of the crotch portion 14B in the widthwise direction is 40-60% of the total width of the abdominal portion 14A and back portion 14C, and the longitudinal length of the crotch portion 14B is 20-50% of the longitudinal length of the absorbent body 14. This allows the disposable diaper to fit the wearer perfectly.

[0044] As the absorbent body 14, a material prepared by mixing and fixing a superabsorbent polymer or the like as a base material with a fiber stack of pulp fibers, an aggregate of filaments of cellulose acetate or the like, or a nonwoven fabric as needed can be used.

[0045] As the packaging sheet 15 , liquid-permeable crepe paper may be used in order to prevent the superabsorbent polymer mixed in the absorbent body 14 from leaking out.

[0046] The three-dimensional gathers 16 are formed by a fixing portion fixed to the side portion of the inner body 10 in the width direction opposite to the body, and a main body portion extending from the fixing portion along the side portion of the inner body 10 in the width direction to the side portion of the inner body 10 in the width direction on the body side. Furthermore, the longitudinal front and rear portions of the main body portion are fixed to the body side of the inner body 10, while the longitudinal middle portion of the main body portion is not fixed to the body side of the inner body 10 and stands upright toward the body side.

[0047] The three-dimensional gathers 16 are formed by a three-dimensional gather sheet 17 folded back at the front end portion of the main body and an elongated three-dimensional gather elastic member 18 extending in the longitudinal direction.

[0048] The three-dimensional pleated sheet 17 can be made of synthetic fibers such as olefins (such as polyethylene or polypropylene), polyesters, and amides, as well as regenerated fibers such as rayon and cuprammonium rayon, and natural fibers such as cotton. Nonwoven fabrics produced by appropriate processing methods such as spunbonding, heat bonding, meltblowing, and needle punching can be used. In particular, nonwoven fabrics with a reduced basis weight and excellent breathability are used to prevent dampness. Furthermore, for the three-dimensional pleated sheet 17, a waterproofing-treated nonwoven fabric coated with a silicone-based, paraffin-based, metal-based, or alkylchromium chloride-based waterproofing agent is preferably used to prevent the permeation of urine, prevent rashes, and improve the feel (dryness) on the skin.

[0049] As the three-dimensional pleated elastic member 18, commonly used materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, polyester, etc. can be used. In addition, in order to make it difficult to be seen from the outside, it is preferred that the thickness is 925 dtex or less, the elongation is 150-350%, and the spacing is 10.0 mm or less. Figure 3 As shown by the two-dot chain line, the three-dimensional gathers elastic member 18 raises the three-dimensional gathers 16 inward by its stretching force. In addition to a linear member, a belt-like member having a predetermined width may be used.

[0050] (First embodiment)

[0051] Figure 6 The middle figure shows the absorber 14 of the first embodiment. Figure 6As shown, the absorber 14 is formed of a rectangular abdomen 14A, a rectangular back 14C, and a crotch portion 14B between the abdomen 14A and the back 14C.

[0052] The crotch portion 14B is formed by a front portion 30 having an inverted trapezoidal shape, a rectangular middle portion 31 , and a rear portion 32 having a trapezoidal shape.

[0053] The left side portion of the front portion 30 is formed into a curved shape with a convex portion on the left side from the left rear portion of the abdomen 14A toward the rear right side, then becomes a straight shape toward the rear right side at a predetermined intersection angle θ with the longitudinal imaginary line L, and then becomes a curved shape with a convex portion on the right side toward the rear right side, reaching the left front portion of the intermediate portion 31. It should be noted that the portion of the left side portion of the front portion 30 formed into a straight shape is referred to as the left inclined portion ("first inclined portion" in technical terms) 30A.

[0054] The right side portion of the front portion 30 is formed from the right rear portion of the abdomen 14A toward the rear left side in a curved shape with a convex portion on the right side, then formed into a straight shape toward the rear left side at a predetermined intersection angle θ with the longitudinal imaginary line L, and then formed into a curved shape with a convex portion on the left side toward the rear left side, reaching the right front portion of the intermediate portion 31. It should be noted that the portion of the right side portion of the front portion 30 formed into a straight shape is referred to as the right inclined portion ("first inclined portion" in technical terms) 30B.

[0055] The left side portion of the middle portion 31 is formed in a straight line parallel to the longitudinal imaginary line L from the left front portion to the left rear portion of the middle portion 31, and the right side portion of the middle portion 31 is formed in a straight line parallel to the longitudinal imaginary line L from the right front portion to the right rear portion of the middle portion 31. It should be noted that the portion of the left side portion of the middle portion 31 formed in a straight line is referred to as the left straight line portion ("straight line portion" in technical terms) 31A, and the portion of the right side portion of the middle portion 31 formed in a straight line is referred to as the right straight line portion ("straight line portion" in technical terms) 31B.

[0056] The left side of the rear portion 32 is formed from the left rear portion of the intermediate portion 31 toward the rear left side in a curved shape with a convex portion on the right side, then forms a straight line toward the rear left side at a predetermined intersection angle β with the longitudinal imaginary line L, and then forms a curved shape with a convex portion on the left side toward the rear left side, reaching the left front portion of the back portion 14C. It should be noted that the portion of the left side of the rear portion 32 formed into a straight shape is referred to as the left inclined portion ("second inclined portion" in technical terms) 32A.

[0057] The right side of the rear portion 32 is formed from the right rear portion of the middle portion 31 toward the rear right side in a curved shape with a convex portion on the left side, then forms a straight line toward the rear right side at a predetermined intersection angle β with the longitudinal imaginary line L, and then forms a curved shape with a convex portion on the right side toward the rear right side, reaching the right front portion of the back portion 14C. It should be noted that the portion of the right side of the rear portion 32 formed into a straight shape is referred to as the left straight portion ("second inclined portion" in technical terms) 32B.

[0058] In the front portion 30 of the abdomen 14A and the crotch portion 14B, a left slit 40A parallel to the left inclined portion 30A is provided at a prescribed distance from the left inclined portion 30A of the front portion 30 along the longitudinal front side, and a right slit 40B parallel to the right inclined portion 30B is provided at a prescribed distance from the right inclined portion 30B of the front portion 30 along the longitudinal front side.

[0059] The front end of the left slit 40A is located near the left side of the abdomen 14A, while the rear end of the left slit 40A is located at the front portion 30 of the crotch 14B and to the right of an imaginary line LA extending along the left side of the middle portion 31 of the crotch 14B. Furthermore, the front end of the right slit 40B is located near the right side of the abdomen 14A, while the rear end of the right slit 40B is located at the front portion 30 of the crotch 14B and to the left of an imaginary line LB extending along the right side of the middle portion 31 of the crotch 14B. Consequently, when the wearer moves their left or right foot forward while walking, for example, a large force is generated in a direction perpendicular to the left or right inclined portion 30A or 30B. This force causes significant deformation of the abdomen 14A and the front portion 30 of the crotch 14B in a direction perpendicular to the left or right inclined portion 30A or 30B. This narrowing of the interval between the left or right slits 40A or 40B in the minor axis direction can suppress this significant deformation. It should be noted that the front end of the left slit 40A may be located on the left side of the abdomen 14A, and the front end of the right slit 40B may be located on the right side of the abdomen 14A. The left slit 40A and the right slit 40B are collectively referred to as slits ("first slits" in technical terms) 40. Furthermore, instead of slits 40, a low basis weight portion of the absorbent material of the absorbent body 14 may be formed, where the basis weight is lower than that of the surrounding portion, or a compressed portion may be formed by compressing the absorbent body 14 in the thickness direction.

[0060] A slit ("second slit" in technical terms) 41 extending longitudinally is provided in the center portion of the middle portion 31 of the crotch portion 14B in the width direction. The front end of the slit 41 is located at the front of the middle portion 31, and the rear end of the slit 41 is located at the rear of the middle portion 31. This allows the wearer to cross their legs while resting, for example, and generate a large force perpendicular to the left and right straight portions 31A, 31B. This force causes the middle portion 31 of the crotch portion 14B to deform significantly perpendicular to the left and right straight portions 31A, 31B. The narrowing of the spacing between the slits 41 in the minor axis direction can suppress this significant deformation. It should be noted that, in place of the slits 41, a low basis weight portion in which the basis weight of the absorbent material of the absorbent body 14 is lower than that of the surrounding portion, or a compressed portion formed by compressing the absorbent body 14 in the thickness direction, may be provided. Alternatively, the front end of the slit 41 may extend to the front portion 30 further forward than the middle portion 31, and the rear end of the slit 41 may extend to the rear portion 32 further rearward than the middle portion 31. In this specification, when both sides of the middle portion 31 in the width direction are formed in an arc shape, the center portion of the middle portion 31 in the width direction refers to the center portion of the narrowest portion in the width direction.

[0061] In the middle portion 31 and the rear portion 32 of the crotch portion 14B, a left slit 42A parallel to the left inclined portion 32A is provided at a prescribed distance from the left inclined portion 32A of the rear portion 32 along the longitudinal rear side, and a right slit 42B parallel to the right inclined portion 32B is provided at a prescribed distance from the right inclined portion 32B of the rear portion 32 along the longitudinal rear side.

[0062] The front end of the left slit 42A is connected to the rear end of the slit 41. The rear end of the left slit 42A is located in the rear portion 32 of the crotch portion 14B and to the right of an imaginary line LA extending along the left side of the middle portion 31 of the crotch portion 14B. Furthermore, the front end of the right slit 42B is connected to the rear end of the slit 41. The rear end of the right slit 42B is located in the rear portion 32 of the crotch portion 14B and to the left of an imaginary line LB extending along the right side of the middle portion 31 of the crotch portion 14B. Consequently, when the wearer moves their left or right foot rearward while walking, for example, a large force is generated in a direction perpendicular to the left or right inclined portion 32A or 32B. This force causes the rear portion 32 of the crotch portion 14B to significantly deform in a direction perpendicular to the left or right inclined portion 32A or 32B. The narrowing of the interval between the left or right slits 42A or 42B in the minor axis direction can suppress this significant deformation. Furthermore, it is possible to prevent the excrement absorbed by the absorber 14 from being discharged to the outside through the rear end of the left slit 42A or the right slit 42B. The back portion 14C of the absorber 14 can also be effectively fitted to the back of the wearer.

[0063] Alternatively, the left slit 42A may be provided so that it is flatter than the left inclined portion 32A, that is, the intersection angle between the left slit 42A and the imaginary line L is smaller than the intersection angle β between the left inclined portion 32A and the imaginary line L, and the right slit 42B may be provided so that it is flatter than the right inclined portion 32B, that is, the intersection angle between the right slit 42B and the imaginary line L is smaller than the intersection angle β between the right inclined portion 32B and the imaginary line L. The left slit 42A and the right slit 42B are collectively referred to as slits ("third slits" in technical terms) 42. Alternatively, instead of slits 42, a low basis weight portion in which the basis weight of the absorbent material of the absorbent body 14 is lower than that of the surrounding portion, or a compressed portion formed by compressing the absorbent body 14 in the thickness direction may be formed.

[0064] In the back portion 14C, a left slit 43A parallel to the right slant portion 32B is provided at a prescribed distance from the left slant portion 32A of the rear portion 32 of the crotch portion 14B along the longitudinal rear side, and a right slit 43B parallel to the left slant portion 32A is provided at a prescribed distance from the right slant portion 32B of the rear portion 32 of the crotch portion 14B along the longitudinal rear side.

[0065] The front end of the left slit 43A is located at the front of the back portion 14C and behind the left slit 42A, while the rear end of the left slit 43A is located at the rear of the back portion 14C and to the right of an imaginary line LB extending along the right side of the middle portion 31 of the crotch portion 14B. Furthermore, the front end of the right slit 43B is located at the front of the back portion 14C and behind the right slit 42B, while the rear end of the right slit 43B is located at the rear of the back portion 14C and to the left of an imaginary line LA extending along the left side of the middle portion 31 of the crotch portion 14B.

[0066] The imaginary lines of the long axes of the left and right slits 43A and 43B intersect at the center of the widthwise direction of the back portion 14C. Furthermore, no slit is formed between the long axes of the left and right slits 43A and 43B. Consequently, when the wearer moves their left or right foot in the front-back direction, such as while walking, a large force is generated in a direction perpendicular to the left or right inclined portion 32A or 32B. This force causes the back portion 14C to significantly deform in a direction perpendicular to the left or right inclined portion 32A or 32B. The narrowing of the intervals between the left and right slits 43A and 43B in the short-axis direction suppresses this significant deformation, allowing the back portion 14C of the absorbent body 14 to effectively fit the wearer's back.

[0067] A slit may be formed midway between the long axes of the left slit 43A and the right slit 43B. The left slit 43A and the right slit 43B are collectively referred to as slits ("fourth slits" in technical terms) 43. Furthermore, instead of slits 43, a low-basis-weight portion of the absorbent material of the absorbent body 14, where the basis weight is lower than that of the surrounding portion, or a compressed portion formed by compressing the absorbent body 14 in the thickness direction, may be formed.

[0068] Regarding the spacing of the slits, the spacing of slit 41 is set to be the largest, the spacing of slit 42 is set to be half the spacing of slit 41, and the spacing of slits 40 and 43 is set to be the same spacing, smaller than the spacing of slit 41 and larger than the spacing of slit 42. For example, the spacing of slit 41 is set to 14 mm, the spacing of slit 42 is set to 7 mm, and the spacing of slits 40 and slit 43 is set to 10 mm. This can suppress deformation of the crotch portion 14B of the absorbent body 14, which is the area that experiences the greatest deformation when the wearer walks, etc.

[0069] (Second embodiment)

[0070] Figure 7 The middle figure shows an absorbent body 14 according to the second embodiment. In addition, the same reference numerals are given to the same components as those of the absorbent body according to the first embodiment, and description thereof will be omitted.

[0071] like Figure 7 As shown, a rectangular elastic member 50 that stretches and contracts in the width direction is provided in the portion of the absorbent body 14 on the opposite side of the body opposite the slit 40. A rectangular elastic member 51 that stretches and contracts in the width direction is provided in the portion of the absorbent body 14 on the opposite side of the body opposite the slit 41 and slit 42. A rectangular elastic member 52 that stretches and contracts in the width direction is provided in the portion of the absorbent body 14 on the opposite side of the body opposite the slit 42. A rectangular elastic member 53 that stretches and contracts in the width direction is provided in the portion of the absorbent body 14 on the opposite side of the body opposite the slit 43. This makes it easy to narrow the spacing between the slits 41, and can quickly suppress deformation of the absorbent body 14 that occurs when the wearer walks, for example. It should be noted that the elastic members 50 and 53 can be replaced by the elastic sheet 24 of the outer body 20, which will be described later.

[0072] (Third embodiment)

[0073] Figure 8 The figure shows an absorbent body 14 according to a third embodiment. Components identical to those of the absorbent body according to the first embodiment are denoted by the same reference numerals, and their descriptions are omitted.

[0074] like Figure 8As shown, the front end of the slit 41 is located in front of the middle portion 31 of the crotch portion 14B, and the rear end of the slit 41 is located in rear of the rear portion 32 of the crotch portion 14B. Thus, when the wearer crosses their legs while resting, for example, the interval between the slits 41 in the minor axis direction becomes narrower, thereby suppressing deformation of the middle portion 31 and rear portion 32 of the crotch portion 14B.

[0075] The front end of the left slit 42A is located in front of the rear portion 32 of the crotch portion 14B and to the left of the slit 41. The rear end of the left slit 42A is located in the rear portion 32 of the crotch portion 14B and to the right of an imaginary line LA extending along the left side of the middle portion 31 of the crotch portion 14B. Furthermore, the front end of the right slit 42B is located in front of the rear portion 32 of the crotch portion 14B and to the right of the slit 41. The rear end of the right slit 42B is located in the rear portion 32 of the crotch portion 14B and to the left of an imaginary line LB extending along the right side of the middle portion 31 of the crotch portion 14B. This allows the wearer to move their left or right foot rearward while walking, for example, by narrowing the distance between the left and right slits 42A, 42B, in the minor axis direction, thereby suppressing deformation of the rear portion 32 of the crotch portion 14B.

[0076] (Fourth embodiment)

[0077] Figure 9 The middle figure shows an absorbent body 14 according to a fourth embodiment. Components identical to those of the absorbent body according to the first embodiment are denoted by the same reference numerals, and their descriptions are omitted.

[0078] like Figure 9 As shown, the front end of the left slit 40A is located near the left side of the abdomen 14A, and the rear end of the left slit 40A is located at the middle portion 31 of the crotch portion 14B and connected to the front end of the slit 41. Furthermore, the front end of the right slit 40B is located near the right side of the abdomen 14A, and the rear end of the right slit 40B is located at the middle portion 31 of the crotch portion 14B and connected to the front end of the slit 41. As a result, when the wearer moves their left or right foot forward while walking, the distance between the left and right slits 40A, 40B, in the short-axis direction becomes narrower, thereby suppressing deformation of the front portion 30 and the middle portion 31 of the abdomen 14A and crotch portion 14B.

[0079] The front end of the slit 41 is connected to the rear end of the left slit 40A and the right slit 40B, and the rear end of the slit 41 is located behind the rear portion 32 of the crotch portion 14B. As a result, when the wearer crosses their legs while resting, the spacing between the slits 41 in the short axis direction becomes narrower, which can suppress deformation of the middle portion 31 and the rear portion 32 of the crotch portion 14B.

[0080] The front end of the left slit 43A is located at the front of the back portion 14C and behind the left slit 42A, while the rear end of the left slit 43A is located at the rear of the back portion 14C and to the right of an imaginary line LB extending along the right side of the middle portion 31 of the crotch portion 14B. Furthermore, the front end of the right slit 43B is located at the front of the back portion 14C and behind the right slit 42B, while the rear end of the right slit 43B is located at the rear of the back portion 14C and to the left of an imaginary line LA extending along the left side of the middle portion 31 of the crotch portion 14B.

[0081] The imaginary lines of the long axes of the left and right slits 43A and 43B intersect at the center of the width direction of the back portion 14C. Thus, when the wearer moves their left or right foot forward and backward while walking, the interval between the left and right slits 43A and 43B in the short axis direction becomes narrower, thereby suppressing deformation of the back portion 14C that occurs in a direction perpendicular to the left and right slits 43A and 43B.

[0082] <Exterior body>

[0083] like Figure 1 、 Figure 2 As shown, the outer body 20 is formed of a front body F facing the abdomen of the wearer and a back body B facing the back, and the front body F and the back body B are formed separately. It should be noted that the front body F and the back body B may also be formed integrally.

[0084] The widthwise sides of the front body F and the widthwise sides of the back body B are fixed by heat welding or the like to form side seals 21. This forms a waist opening for the wearer's body to pass through and a pair of left and right leg openings for the legs to pass through.

[0085] The outer body 20 is formed by a waist portion N, which is a longitudinal front and rear region having side seals 21, and a leg opening M connecting the front and rear waist portions N. The waist portion N is generally formed by a waist portion W located at the waist opening and a lower waist portion U located closer to the leg opening M than the waist portion W.

[0086] The outer body 20 is formed by an inner sheet 22 on the body side, an outer sheet 23 on the opposite side of the body, and an elastic sheet 24 that can be stretched and contracted in the width direction and sandwiched between the inner sheet 22 and the outer sheet 23. It should be noted that the longitudinal side portions of the outer sheet 23 are folded back and extend on the body side of the inner sheet 22.

[0087] like Figure 10As shown, openings 25 are formed in the elastic sheet 24 at predetermined intervals in the longitudinal and width directions. The inner sheet 22 and the outer sheet 23 are fixed together by adhesive portions 26 formed by ultrasonic welding provided on the inner periphery of the openings 25. This forms concave and convex portions on the body side and the opposite side of the outer body 20 when worn, enabling the outer body 20 to fit closely to the wearer.

[0088] As with the topsheet 11 , the inner sheet 22 and the outer sheet 23 are preferably formed of nonwoven fabric having excellent air permeability and softness.

[0089] The elastic sheet 24 can be any sheet made of an elastic thermoplastic resin. Besides elastic films, stretchable nonwoven fabrics are also acceptable. Particularly preferred are a tensile strength of 8 to 25 N / 35 mm in the width direction, a tensile strength of 5 to 20 N / 35 mm in the longitudinal direction, a tensile elongation of 450 to 1050% in the width direction, and a tensile elongation of 450 to 1400% in the longitudinal direction. While not particularly limited in thickness, the thickness is preferably approximately 20 to 40 μm.

[0090] <Explanation of Terms in the Specification>

[0091] Unless otherwise specified in the specification, the following terms in the specification have the following meanings.

[0092] "Front" and "back" refer to the front and back portions of the shorts-type disposable diaper, respectively, with the front-back center of the shorts-type disposable diaper as the boundary. Furthermore, the crotch portion refers to the front-back area including the front-back center of the shorts-type disposable diaper. If the absorbent body has a constricted portion, the crotch portion refers to the front-back area of ​​the portion having the constricted portion.

[0093] "Elongation" refers to the value when the natural length is 100%. For example, an elongation of 200% has the same meaning as an elongation of 2 times.

[0094] "Thickness" uses an automatic thickness gauge (KES-G5 portable compression measurement program) at a load of 0.098N / cm 2 And pressurized area: 2cm 2 Automatic measurement under the conditions of

[0095] "Tensile strength" and "tensile elongation (elongation at break)" are values ​​measured in accordance with JIS K7127:1999 "Plastics - Test Methods for Tensile Properties" with an initial chuck spacing (distance between markings) of 50 mm and a tensile speed of 300 mm / min, except that the test piece is a rectangular piece measuring 35 mm wide by 80 mm long. The tensile testing machine used may be, for example, the AUTOGRAPH AGS-G100N manufactured by Shimadzu Corporation.

[0096] The "expanded state" refers to a state in which the device is flatly expanded without being shrunk or relaxed.

[0097] · Unless otherwise specified, the dimensions of each part refer to the dimensions in the unfolded state, not the natural length state.

[0098] Unless otherwise stated, the environmental conditions for testing or measurement were carried out in a test room or device under standard conditions (test site temperature 23±1°C, relative humidity 50±2%).

[0099] Industrial Applicability

[0100] The present invention can be used in disposable diapers.

[0101] Explanation of symbols

[0102] 10 inner body

[0103] 11 surface sheets

[0104] 12 back sheet

[0105] 14 absorber

[0106] 14A Abdomen

[0107] 14B crotch

[0108] 14C back

[0109] 20 outer body

[0110] 30 front

[0111] 30A left inclined portion (first inclined portion)

[0112] 30B right inclined portion (first inclined portion)

[0113] 31 Middle

[0114] 31A left straight line (straight line)

[0115] 31B right straight line part (straight line part)

[0116] 32 rear

[0117] 32A left inclined portion (second inclined portion)

[0118] 32B right inclined portion (second inclined portion)

[0119] 40 slits (1st slit)

[0120] 41 slit (second slit)

[0121] 42 slits (3rd slit)

[0122] 43 slits (4th slit)

[0123] 50 elastic components

[0124] 51 elastic components

[0125] 52 elastic components

[0126] 53 elastic components

Claims

1. A disposable diaper, characterized in that: An inner body is formed by providing an absorbent body between a liquid-permeable top sheet and a liquid-impermeable back sheet, and an outer body that can stretch in the width direction is fixed to the opposite side of the inner body to the body. The absorbent body is formed by a rectangular abdomen facing the wearer's abdominal portion, a rectangular back facing the wearer's dorsal portion, and a crotch portion connecting the abdomen and the back, when viewed from above. A first inclined portion extending from the front side to the rear side in the width direction inward is formed on both sides of the front portion of the crotch portion. A second inclined portion extending from the rear side to the inner side of the front side in the width direction is formed on both sides of the rear portion of the crotch portion in the width direction. A straight line portion extending from the rear end portion of the first inclined portion to the front end portion of the second inclined portion is formed on both sides in the width direction of the middle portion of the crotch portion. A first slit parallel to the first inclined portion is provided at a predetermined interval on both sides of the front portion of the abdomen and crotch in the width direction. A second slit parallel to the straight portion is provided at the center of the width direction of the middle portion of the crotch portion. A third slit is provided on both sides of the rear portion of the crotch portion in the width direction, with a rear end portion located outside the front end portion in the width direction, at a predetermined interval from the second inclined portion. A fourth slit parallel to the second inclined portion is provided in a cross-sectional manner at the middle portion in the width direction of the back portion. The rear end portion of the first slit is located inside the width direction of the straight portion. The front end portion of the fourth slit is located at a predetermined distance in the longitudinal direction from the rear end portion of the third slit.

2. The disposable diaper according to claim 1, wherein The intersection of the fourth slits is located at the center of the back portion in the width direction, and the length of the fourth slit at the rear side of the intersection is formed to be longer than the length of the fourth slit at the front side of the intersection.

3. The disposable diaper according to claim 1 or 2, wherein: The intervals between the second slits in the short-axis direction are formed to be larger than the intervals between the first slit, the third slit, and the fourth slit in the short-axis direction.

4. The disposable diaper according to claim 1 or 2, wherein: The front end portion of the third slit is connected to the rear end portion of the second slit.

5. The disposable diaper according to claim 1 or 2, wherein: An elastic member that is stretchable in the width direction is provided at least at one location on the side of the absorbent body opposite to the body, the location facing the first slit, the second slit, the third slit, and the fourth slit.

Images