KR102520783B1 - Disposable diaper - Google Patents

Abstract

The present invention provides a disposable diaper provided with side flaps capable of increasing bonding strength with a waist belt and having a pleasant feel. In a disposable diaper (10) having a diaper body (16) and a pair of waist belts (17) for connecting the front and back waist regions (11, 12), the pair of waist belts (17) are It is joined to the diaper body 16 through bonding lines 18A and 18B that approach the vertical center line P from the opening 15 side toward the waist opening 14 side, and the diaper body 16, Outside of the horizontal direction (X) of both edge portions of the absorber (23), it has side flaps (40) extending in the longitudinal direction (Y), and the side flaps (40) extend along the leg opening (15). It has a high rigidity region 41 having a higher rigidity than other regions in the edge portion, and both ends 41A and 41B of the high rigidity region 41 are located on the bonding lines 18A and 18B. do.

Description

Disposable diaper {DISPOSABLE DIAPER}

The present invention relates to disposable diapers.

Conventionally, a diaper body having a front and back waist region and a crotch region located between the front and back waist regions and having an absorbent body, a pair of waist belts for connecting the front and back waist regions, a waist opening and a pair of leg openings. Disposable diapers are known. For example, in the disposable diaper disclosed in Patent Literature 1, a pair of waist belts are joined to the diaper body through a joint line approaching the vertical center line from the leg opening side toward the waist opening side, and in the diaper body, the absorbent A pair of side flaps are formed on the outside in the horizontal direction. This side flap consists of a plurality of laminated sheet members, and has substantially uniform rigidity as a whole. The side flaps are joined to the waist belt through joint lines and form leg openings together with the waist belt.

Patent Document 1: Japanese Patent Laid-Open No. 9-10261

The diaper described in Patent Literature 1 can give the wearer an impression like underwear compared to a diaper in which the front and back waist regions are formed by an annular waist belt or a diaper in which the front and back waist regions and the crotch region are formed by integral sheet members. there is.

However, in the diaper described in Patent Literature 1, when the diaper is pulled up by holding the waist belt, when the bonding strength at the joint between the waist belt and the side flaps is relatively low, in the vicinity of the end of the joint line on the leg opening side. , it becomes easy to cause tearing in the side flaps. On the other hand, if the rigidity of the entire side flap is increased in order to increase the bonding strength, the flexibility of the side flap is impaired and the touch is lowered.

An object of the present invention is to provide a disposable diaper provided with side flaps that can increase the joint strength with a waist belt and is comfortable to the touch as an improvement of the prior art.

The present invention is a diaper body having a longitudinal direction and a transverse direction, and a vertical centerline dividing the dimension in the transverse direction into two parts, and having front and rear waist regions, a crotch region located between the front and back waist regions, and an absorbent body; A disposable diaper having a pair of waist belts for connecting waist regions, a waist opening and a pair of leg openings.

In the diaper of the present invention, the pair of waist belts are joined to the diaper body in the front and rear waist regions through joint lines having a smaller distance from each other from the leg opening side toward the waist opening side, , the diaper body has side flaps extending in the longitudinal direction outside the transverse direction of both edge portions of the absorbent body, and the side flaps have side flaps extending along the leg openings compared to other regions. It is characterized in that it has a high-stiffness region having high stiffness, and both ends of the high-stiffness region are located on the bonding line.

The diaper body includes a liquid-permeable inner layer sheet, a liquid-impermeable outer layer sheet, the absorber positioned between the inner and outer layer sheets, and a pair of side sheets disposed on both sides of the absorber. In addition, since the high-rigidity region is formed by disposing a separate elastic sheet on the side sheet, it is fitted in a planar shape to the body without a gap at the edge of the leg opening and prevents transverse leakage of excretion. can

The side sheet has a first sheet located on the side facing the skin and a second sheet located on the side opposite to the skin, and since the elastic sheet is located between the first and second sheets, the elastic sheet Both sides of the edge portion is exposed to the outside and peeled off, or it does not cause a sense of discomfort by touching the skin.

Since the elastic sheet is disposed on at least one of the skin facing surface side and the skin non-facing surface side of the side sheet, elasticity can be imparted to the inelastic side sheet.

Since a plurality of leg elastic members extending in the longitudinal direction are disposed in the high rigidity region, the fit property at the edge portion of the leg opening can be improved together with the elastic sheet.

The leg elastic bodies are disposed between sheet members laminated in the high rigidity region, and a plurality of waist elastic bodies are disposed in the waist belt, and the leg elastic bodies and the waist elastic bodies are disposed in the thickness direction of the sheet member. Since they do not overlap with each other, concentration of stress due to overlapping of these can be avoided, and the leg opening edges can be fitted planarly.

Since the width of the high rigidity region is 3 to 30 mm, the leg opening edge portion can be fitted to the thigh of the wearer in a planar shape.

According to one or more embodiments of the disposable diaper according to the present invention, the side flaps have a high stiffness region having a higher stiffness than other regions in the edge portion extending along the leg opening, and both ends of the high stiffness region, Since it is located on the joining line, in the end part of the leg opening side of the joining line, the joining strength between the waist belt and the side flaps increases, and it is possible to prevent tearing of the side flaps from occurring. In addition, in the side flaps, the high rigidity region is located at the edge of the side flaps forming the leg openings, and the other regions have relatively low stiffness, so that the side flaps can maintain flexibility and feel good. there is.

1 is a perspective view of a diaper shown as an example of a disposable diaper in a first embodiment of the present invention.
Fig. 2 is a plan view in a state where the diaper is stretched in the longitudinal and transverse directions, and the inner surface of the waist belt and the inner surface of the diaper body are brought into contact with each other.
Fig. 3 is a plan view in which the diaper body and the waist belt are stretched in the longitudinal and transverse directions by unsplicing the joining lines in the front and back waist regions of the diaper.
FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 2 .
FIG. 5 is an enlarged view of a region surrounded by line V in FIG. 4 .
FIG. 6(a) is an enlarged view of a part of a region surrounded by line V(a) in FIG. 3 .
FIG. 6(b) is an enlarged view of a part of the region surrounded by line V(b) in FIG. 3 .
Fig. 7 is a front view of the diaper in a contracted state in an aspect in which the inner surface of the front waist region and the inner surface of the rear waist region are brought into contact with each other.
8 is a front view of the diaper showing a state when worn.
Fig. 9 is a side view of the diaper in a worn state.
Fig. 10 is the same sectional view as Fig. 5 of the diaper 10 in one example of a modified example.

Each of the following embodiments includes optional and preferable features as well as indispensable features of the invention for the disposable diapers shown in Figs. 1 to 10 as examples of the present invention. In FIGS. 2 to 4 , each elastic body to be described later opposes the contraction force, and gathers generated in the member to which each elastic body is attached are natural by the contraction force in the horizontal direction (X) and the vertical direction (Y). It is in a state of elongation to such an extent that it appears to have been substantially eliminated by the

1 to 3, the diaper 10, which is an example of a disposable diaper according to the present invention, has a longitudinal direction (Y) and a transverse direction (X) orthogonal thereto, a skin facing surface and a non-skin facing surface on the opposite side thereof. A front waist region 11 having a surface, a vertical center line P dividing the length dimension in the horizontal direction X into two parts, and a horizontal center line Q dividing the length dimension in the vertical direction Y into two parts, It includes a back waist region 12 and a crotch region 13 located between the front waist region 11 and the back waist region 12 . The diaper 10 is substantially symmetrical about the longitudinal center line P, and has a waist opening 14 and a pair of leg openings 15.

The diaper 10 includes a diaper body 16 having an absorbent body 23 and extending in the longitudinal direction Y, and a pair of waist belts 17 for connecting front and back waist regions 11 and 12. . The pair of waist belts 17 are arranged substantially symmetrically with respect to the vertical center line P, and approach the vertical center line P from the leg opening 15 side toward the waist opening 14 side. It is bonded to the diaper body 16 via bonding lines (seal lines) 18A, 18B formed of independent seal portions. The sealing portion is applied by a known bonding means, for example, various heat welding means such as heat embossing and sonic processing. The skin facing surface of the waist belt 17 and the skin facing surface of the diaper body 16 are fixed to each other at joint lines 18A and 18B. By having such a joining mode, the joining lines 18A and 18B do not touch the wearer's body and give discomfort or stimulation. Insofar as the effect of the present embodiment described later is exhibited, a known bonding means such as a hot melt adhesive may be used for the bonding lines 18A and 18B in addition to the thermal welding means. The waist belt 17 is formed of a pair of elastic panels, but can be formed from the same sheet material as the diaper body 16 by a manufacturing method described later.

<Diaper Body>

3 to 5, the diaper main body 16 has front and rear edges 16a and 16b spaced apart in the longitudinal direction Y and both sides spaced apart and opposed in the horizontal direction X. A front end portion 20A defined by the edges 16c and 16d and located between the front edge 16a, a rear end portion 20B located between the rear edge 16b, and the front and rear ends It has an intermediate part 20C located between 20A and 20B. The front and rear edge edges 16a and 16b are each substantially symmetrical with respect to the vertical center line P, and extend outward in the vertical direction Y in a convex shape. The front and rear ends 20A and 20B are located in the front and back waist regions 11 and 12 of the diaper 10, respectively, and the middle section 20C is located in the crotch region 13.

The diaper body 16 is formed between a liquid-permeable inner layer sheet 21 positioned on the skin-facing surface, a liquid-impervious outer-layer sheet 22 positioned on the skin-non-facing surface, and the inner and outer layer sheets 21, 22. It includes an absorber 23 located and a liquid-impermeable or liquid-impervious leak prevention sheet 24 located between the absorber 23 and the outer layer sheet 22. On both sides of the inner and outer layer sheets 21 and 22, there are disposed a pair of side sheets 25 interposed therebetween, spaced apart from each other in the lateral direction (X) and extending in the vertical direction (Y). In addition, the diaper body 16 is a part of the side sheet 25 extending outward in the horizontal direction X from both edges of the inner and outer layer sheets 21 and 22 and the leakage prevention sheet 24 (ie, the absorbent body). On the outer side in the transverse direction of (23), it has side flaps 40 made of a region not including the inner and outer layer sheets 21 and 22 and the leak prevention sheet 24.

The inner layer sheet 21 has a substantially octagonal shape and has a mass of about 15 to 35 g/m 2 , preferably about 18 to 24 g/m 2 , hydrophilic treated hydrophobic air-through fiber nonwoven fabric, spunbond fiber nonwoven fabric, point It is preferable to be formed of a bond fiber nonwoven fabric or the like. The outer layer sheet 22 is a hydrophobic spunbond/melt blown/hydrophobic spun bond/melt blown/m2 having substantially the same shape and size as the inner layer sheet 21, and having a mass of about 15 to 30 g/m 2 , preferably about 18 to 24 g/m 2 . It is preferably formed of a spunbond (hereinafter referred to as SMS) fibrous nonwoven fabric or a spunbond fibrous nonwoven fabric.

The absorber 23 has front and rear end edges 23a and 23b convexly bent outward in the longitudinal direction Y, and opposite side edges 23c extending in the longitudinal direction Y between the front and rear end edges, It includes a liquid-absorbing core shaped into a shape and a liquid-diffusing core cover sheet such as tissue paper covering the liquid-absorbing core. As the liquid-absorbent core, wood fluff pulp, super-absorbent polymer particles, or a mixture thereof can be used. The liquid-absorbent core and the core cover sheet can be bonded to each other using a known bonding means such as a hot melt adhesive.

The anti-leakage sheet 24 is disposed so as to cover at least the entire non-skin facing surface (bottom surface) of the absorbent body 23, and between the absorbent body 23 and the outer layer sheet 22, a known material such as a hot melt adhesive It can join by joining means. As the anti-leakage sheet 24, for example, a liquid-impermeable, preferably liquid-impervious and air-permeable plastic film can be used, and the anti-leakage sheet 24 covers the entire non-skin facing surface of the absorber 23. , It is possible to prevent the body fluid absorbed by the absorber 23 from leaking out of the diaper 10 . Although not shown, a sheet having a decorative element such as a picture or color may be used as the leakage preventing sheet 24, and the decorative element may be transmitted from the outer layer sheet 22 having a required light transmittance.

4 and 5, a pair of side sheets 25 are disposed on both sides of the absorber 23 in the horizontal direction X, between the leak prevention sheet 24 and the inner layer sheet 21. , hot melt adhesive or the like. The side sheet 25 is formed of a first sheet 25A located on the absorber 23 side and a second sheet 25B located on the outer layer sheet 22 side, and both sheets 25A and 25B are made of hot melt. They are bonded by known means such as an adhesive. As the side sheet 25, for example, a hydrophobic SMS fiber nonwoven fabric or spunbond fiber nonwoven fabric having a mass of about 10 to 30 g/m 2 can be used.

Between the outer edge of the first sheet 25A and the outer edge of the second sheet 25B, a plurality of leg elastic bodies 26 extending in the longitudinal direction, and a leg elastic body 26 located on the side facing the skin A leg elastic sheet 27 is disposed. The side flaps 40 consist of a high rigidity region 41 where the leg elastic sheet 27 is disposed and a low rigidity region 42 formed only of the side sheet 25 located inside in the lateral direction X. have The high rigidity region 41 has a higher rigidity than the low rigidity region 42 because the number of laminated sheets is greater than that of the low rigidity region 42 . On the other hand, in this way, in order to form a region with higher rigidity than the low rigidity region 42 along the leg opening edge, instead of or together with the leg elastic sheet 27, the side sheet 25 is bent. A portion may be located, or an inelastic auxiliary sheet may be disposed.

The leg elastics 26 are formed of a plurality of strings or strands attached to the diaper body 16 from the front edge 16a to the rear edge 16b so as to be able to contract in an elongated state in the longitudinal direction Y. of elastic materials. The leg elastic sheet 27 is a belt-shaped elastic member attached so as to be stretchable in the longitudinal direction Y between the front edge 16a and the rear edge 16b of the diaper body 16, and is made of flat rubber. It is formed of an elastic stretchable fibrous nonwoven fabric formed of elastic fibers. By disposing the leg elastic bodies 26 and the leg elastic sheets 27 on both sides of the diaper body 16, the leg elastic regions ( The same area as the high rigidity area 41) is formed. Referring to FIG. 3, since the leg elastic sheet 27 extends from the front edge 16a to the rear edge 16b of the diaper body 16, both ends of the high stiffness region 41, that is, in the vertical direction ( Both ends 41A and 41B in Y are located on the bonding lines 18A and 18B. In this embodiment, the side sheet 25 is formed of two sheets 25A and 25B, but may be formed by bending and fixing one sheet of fibrous nonwoven fabric, or may be formed as an extension of the outer layer sheet 22. . The leg elastic sheet 27 may be disposed on the side facing the skin or on the side not facing the skin of the side sheet 25, but as in the present embodiment, by disposing between the first sheet 25A and the second sheet 25B. , it is possible to prevent the side edge portion from being exposed to the outside and peeling therefrom, and the discomfort caused by the side edge portion directly touching the skin can be reduced.

<waist belt>

2 and 3, the waist belt 17 has both end edges (front and rear end edges) 17a and 17b bonded to the diaper body 16 through joint lines 18A and 18B, and the diaper body 16 ) has a lower edge 17c forming the leg opening 15 together with both side edges 16c and 16d, and an upper edge 17d forming a waist opening edge. The waist belt 17 is divided into an upper portion 51 located on the waist opening side (first side edge side) and a lower portion 52 located on the leg opening side (second side edge side). The dimensions of the upper portion and the lower portion in the width direction are approximately 30 to 70% of the width W1 of the waist belt 17, preferably 50%. Therefore, for example, in the case of a normal adult diaper of size M, the width W1 of the waist belt 17 is about 70 mm, and the width of the upper and lower portions 51 and 52 is about 35 mm. .

The waist belt 17 has inner and outer layers 31 and 32 formed of a waist sheet 30 made of a fibrous nonwoven fabric. Between the inner and outer layers 31 and 32, a plurality of waist elastic bodies 33 and 34 made of string-shaped or strand-shaped elastic materials are attached so as to be contractible in an extended state. The waist elastic bodies 33 and 34 have an upper waist elastic body 33 disposed on the upper portion 51 and a lower waist elastic body 34 disposed on the lower portion 52 .

On the side of the lower edge 17c of the waist sheet 30, a waist elastic sheet 35 made of an elastic fiber nonwoven fabric is disposed. The waist elastic sheet 35 is arranged so that a part of it overlaps with the lower waist elastic body 34 located at the bottom. Further, the waist sheet 30 is fixed on the upper edge 17d side in a state where a part thereof is bent inward. A plurality of upper waist elastic bodies 33 are arranged in this bent portion 36 . In addition, the upper waist elastic body 33 disposed at the bent portion 36 and the upper waist elastic body 33 disposed in the main body portion of the waist sheet 30 other than the bent portion 36 are misaligned in the thickness direction, respectively. It is desirable to have In this way, concentration of extensional stress due to overlapping of the upper waist elastic members 33 in the thickness direction can be avoided, and fit to the body can be realized in a wide range. In addition, since the bent portion 36 is located at the edge of the waist opening, the light transmittance is locally lowered, resulting in a more shorts-like underwear-like appearance.

In this embodiment, ten upper waist elastic bodies 33 are arranged in the upper portion 51 of the waist belt 17 . The six upper waist elastic bodies 33 (including the elastic bodies disposed at the bent portion 36) disposed on the side of the waist opening have a thickness of 450 to 500 dtex, and are fixed in a stretched state of 3.0 to 3.5 times. Among the upper waist elastic members 33, the four elastic members arranged on the leg opening side have a thickness of 600 to 650 dtex, and are fixed in a stretched state of 2.5 to 3.0 times. Seven lower waist elastic members 34 are disposed in the lower portion 52, and the lower waist elastic members 34 have a thickness of 600 to 650 dtex, and are fixed in a stretched state by 2.5 to 3.0 times. The pitch (separation dimension) between each elastic body in the upper waist elastic body 33 and the lower waist elastic body 34 is equal interval and is 5.0-6.0 mm.

In the waist belt 17, the lower waist elastic body 34 and the leg elastic sheet 27 are disposed in the lower part 52, so that the upper part 51 in the lateral direction X per unit area The tensile stress in the transverse direction X per unit area of the lower portion 52 is higher than the tensile stress. Thus, by making the extension stress of the upper part 51 relatively low, when wearing, it becomes easy to widen a waist opening. On the other hand, since the elongation stress of the lower part 52 is relatively high, it stably fits the wearer's body around the leg, and can exert the required holding force. In particular, the diaper 10 is of a so-called low rise type with a shallow rise, the width of the waist belt 17 is smaller than the width of the diaper body, and is easily shifted by the wearer's movement during wearing. However, by stably fitting the body in the lower part 52, such a position shift can be suppressed.

<Method of measuring elongational stress>

The tensile stress of the upper part 51 and the lower part 52 was measured by the following method using a tensile tester manufactured by Instron Japan Co., Ltd. First, the absorbent body 23 is removed from the diaper 10, and regions forming the front and back waist regions 11 and 12 extending in the waist circumferential direction are cut out to obtain an annular elastic panel, the center of the width dimension of the elastic panel. An annular sample 1 corresponding to the upper portion 11A of the front and back waist regions 11 and 12 by cutting at a portion (central portion in the vertical direction Y) at a cut line extending in the waist circumferential direction; An annular sample 2 corresponding to the lower part 11B of the front and back waist regions 11 and 12 is obtained, and the dimensions of the samples 1 and 2 in the contracted state are measured (K1, K2), respectively.

First, in the case of measuring the tensile stress of the sample 1, the separation distance between the upper and lower hooks of the tensile tester is adjusted to be the length dimension K1 in the contracted state of the sample 1, and the upper hook (fixture) to one end of the sample 1 (a portion corresponding to the longitudinal central portion 17f of the waist belt 17 shown in FIG. 7), and to the other end of the sample 1 to the lower hook (movable tool). (The portion corresponding to the central portion 17e in the longitudinal direction of the waist belt 17 shown in FIG. 7) is attached. On the other hand, before stretching, the distance between the hooks is finely adjusted so that the stretching stress becomes 0.1 N. After that, the tensile tester is set to cycle mode, and the upper hook is moved at a tensile speed of 300 mm/min. For example, for the sample 1 (upper part), since the dimension K1 at the time of contraction is 244 mm, the sample 1 is further stretched by 235 mm and then returned to the original position is repeated twice. The forward stress at the time of elongation by 56 mm and the return stress at the time of elongation of the second time by 181 mm were measured to determine the elongational stress of sample 1. On the other hand, the tensile stress of sample 2 was also determined by the same measuring method as in sample 1.

According to the measurement results by the above measurement method, the running stress of sample 1 was 1.082 N and the running stress of sample 2 was 1.083 N, both of which were substantially the same size. Therefore, in the front and back waist regions 11 and 12, the tensile stress when elongated in the waist circumferential direction is almost the same size, and when worn, the entire front and rear waist regions 11 and 12 can be widened with a relatively small force. . On the other hand, the return stress of sample 1 was 3.476 N, and the return stress of sample 2 was 4.557 N. Therefore, it can be said that the leg opening side of the front and back waist regions 11 and 12 fits the body more than the waist opening side in the wearing state.

The lower waist elastic body 34 disposed on the lower portion 52 is attached with a lower extension ratio than the upper waist elastic body 33 disposed on the upper portion 51 . Specifically, the difference between the extension ratio of the lower waist elastic body 34 and the extension ratio of the upper waist elastic body 33 is 0.5 times or less. Specifically, the extension ratio of the upper waist elastic body 33 is 3.2 to 3.7 times, and the extension ratio of the lower waist elastic body 34 is 2.7 to 3.2 times. In this way, by setting the extension ratio of the lower waist elastic body 34 relatively low, the amount of contraction of the lower part 52 is smaller than that of the upper part 51, and the leg opening is extremely extreme in the contracted state compared to the stretched state. Since it does not become small and it is easy to insert the leg through the leg opening, the toe does not get caught in the leg opening when worn, and it can be worn smoothly. In addition, by arranging the leg elastic sheet 27 in the lower part 52 instead of adjusting the pitch or number of the upper waist elastic body 33 and the lower waist elastic body 34, in the contracted state of the leg opening edge portion The dimension is larger compared to the state in which the leg elastic sheet 27 is not disposed, the leg opening can be made larger, and by setting the difference in tensile stress between the upper and lower portions 51 and 52 to occur, the lower portion ( 52) has a relatively high tensile stress, it fits into a planar shape, and penetration into the skin is suppressed.

Further, it is preferable that the thickness of the lower waist elastic body 34 is larger than that of the upper waist elastic body 33 . In this way, by setting the thickness of the lower waist elastic body 34 relatively large, it is possible to exert a relatively large tensile stress at a low magnification and realize the fit of the leg opening edge portion.

2 and 3, in an extended state in which the diaper 10 is developed by peeling the bonding line 18A, the length L3 of the upper edge 17d of the waist belt 17 is the lower edge ( It is larger than the length dimension L4 of 17c) and has a trapezoidal shape. Specifically, for example, in a normal M size diaper, the length of the upper edge 17d of the waist belt 17 (the length of the upper portion 51) L5 is 550 to 600 mm , the length dimension L6 of the lower edge 17c (the length dimension of the lower portion 52) is 300 to 350 mm, and the dimension W1 in the width direction is 60 to 95 mm. Further, even when the waist belt 17 is contracted, the length L6 of the lower portion 52 is smaller than the length L5 of the upper portion 51 . In the extended and contracted state of the waist belt 17, the length L6 of the lower part 52 has a size of 50 to 80% of the length L5 of the upper part 51.

6(a) and (b), the waist belt 17 is bonded so that the first side edge 17c side is the leg opening edge side and the second side edge 17d side is the waist opening edge side. Through lines 18A and 18B, they are retractably joined to the front and rear ends 20A and 20B of the diaper body 16 in a stretched state. In this embodiment, the edge of the waist opening at the intersection 61 of the edge of the waist opening and the boundary line 60 of the waist belt 17 and the diaper body 16 forming the inner edge of the joining line 18A The intersection θ1, which is the intersection of the imaginary line 62 (extended parallel to the vertical center line P) and the boundary line, is the intersection of the boundary line forming the inner edge of the junction line 18B and the waist opening edge ( It is the same as the intersection angle θ2 of the imaginary line 64 orthogonal to the edge of the waist opening in 63 and the boundary line. However, if necessary, these piers θ1 and θ2 may have different sizes. In that case, the front side (ventral side) and the rear side (dorsal side) of the diaper 10 can be easily identified when worn.

When the diaper 10 is worn, the wearer or wearing assistant pulls it in the waist circumferential direction by the force of pulling up by gripping the waist belt 17 and the contraction action of the waist elastic bodies 33 and 34 The force to try is concentrated, stress is concentrated at the intersection points 61 and 63 of the waist opening and the joining line 18A, and tearing is likely to occur. In the bonding line 18A, since the plurality of sheets are joined and integrated by thermal welding means instead of hot melt adhesive, the rigidity is relatively high, and tearing of the diaper 10 is suppressed even when such a force is concentrated. can do. In addition, in order to prevent tearing from the intersection points 61 and 63, the joint area of the entire joint line 18A and 18B or the portion on the side of the intersection points 61 and 63 is larger than that of other portions, so that the joint strength is locally increased. may be increased, or the sheet strength may be increased by attaching a reinforcing sheet to the region including the portion.

Referring to FIG. 3 , the dimension L2 of the longitudinal direction Y of the absorber 23 is approximately 65 to 95 of the dimension L1 of the longitudinal direction Y of the diaper 10 (diaper body 16). has a size of %. Usually, the absorber's longitudinal dimension is about 60% of the diaper's longitudinal dimension, and the area of the portion formed only of the sheet member positioned longitudinally outside the diaper's absorbent member is relatively large. In this embodiment, while the absorber 23 has a sufficient length dimension to be able to exhibit the required water absorption performance, by making the area of the portion consisting of only the sheet member located outside the longitudinal direction Y relatively small, It can be manufactured with materials, and the manufacturing cost can be suppressed. In addition, since the front and rear edges 23a, 23b of the absorbent body 23 and the front and rear edges 16a, 16b of the diaper body 16 are closer than in a normal diaper, the waist opening is the navel in the worn state. It is a refreshing wearing style with a low rise that is located below the part.

Referring to FIG. 7 , the diaper 10 has a curved shape such that the entire waist opening is convex downward. That is, since the position of the central part in the horizontal direction of the front and rear waist regions 11 and 12 is located lower than both sides thereof, when the length of the upper and lower zones is the same, or the length of the upper zone is greater than the length of the lower zone. Compared to large conventional diapers, it can give a fresh impression and is excellent in design.

Referring to FIG. 8 , when the waist belt 17 is pulled up while the diaper 10 is worn, stress is concentrated in the joint lines 18A and 18B. In particular, at the end portion 45 on the side of the leg opening 15 in the joining lines 18A and 18B, the second side edge 17b of the waist belt 17 is positioned in an unworn state (virtual in FIG. 5). The position of the second side edge 17b indicated by the line) is in a state of being pulled up upwards, the tensile stress increases, and tearing is likely to occur. In the diaper 10 of this embodiment, since the both ends 41A and 41B of the high rigidity region 41 extend to the ends 45 of the joining lines 18A and 18B, the ends 45 are low. Compared to the rigid region 42, the number of stacked sheets is increased (see FIG. 6), and the bonding strength in the seal part is increased. Thus, even when stress is concentrated on the end portion 45 of the joining lines 18A and 18B, it is possible to effectively prevent tearing of the side flap 40 at and in the vicinity of the end portion 45 . In addition, in the side flaps 40, since the flexible low-stiffness region 42 is located inside the high-stiffness region 41, the touch can be improved.

Referring again to FIG. 5 , in consideration of the balance between the fit of the high rigidity region 41 and the feel of the low stiffness region 42, the width W2 of the high stiffness region 41 is about 3 to It is preferably in the range of 30 mm, more preferably in the range of about 5 to 15 mm. In addition, the leg elastic body 26 and the lower waist elastic body 34 are arranged so as not to overlap each other in the thickness direction Z. This suppresses the concentration of the tensile force by the elastic bodies 26 and 34 on one point on the bonding lines 18A and 18B (see the enlarged view in Fig. 8), making it more difficult to tear. . In addition, in the plan view shown in FIG. 2, a part of the leg elastic body 26 is located outside the lower waist elastic body 34 in the horizontal direction X, thereby effectively preventing the horizontal leakage of excretion from the edge of the leg opening. can do.

As described above, the diaper 10 has the bent portion 36 located at the edge on the side of the waist opening 14, so that, like the leg openings 15, the portion where the bent portion 36 is located is a waist belt. In (17), a waist high-stiffness region having higher rigidity than other portions is formed. For this reason, when the diaper 10 is worn, the diaper 10 can be pulled up by hooking a finger to the boundary between the high-stiffness region of the waist and the region of relatively low stiffness adjacent thereto. This boundary portion is easily bent due to the difference in stiffness, and since the high stiffness region of the waist has a convex shape compared to the adjacent portion, the finger is easily caught in the convex portion, and lifting operation is facilitated. In addition, since the high-stiffness waist region extends to the joining lines 18A and 18B of the front and rear waist regions 11 and 12, at the end of the joining lines 18A and 18B on the side of the waist opening 14, they are laminated. Since the number of sheets is increased, the bonding strength is increased, and the occurrence of tearing from the end portion can be prevented.

The diaper 10 of the present embodiment is a low-waisted type with a relatively shallow rise (low It is suitable as a rise type) diaper. When the diaper 10 is used for light incontinence, it is preferable that the thickness of the absorber 23 is relatively small, and that the absorber 23 does not have a leak-preventing flap that rises toward the wearer on the skin-facing surface of the absorber 23. do. Further, in order to give an underwear-like impression and increase flexibility, the number of sheet members stacked in the low rigidity region 42 is preferably two or less, more preferably one. On the other hand, in the high rigidity region 41, it is preferable that two or more (preferably two or three) sheet members are laminated and an elastic material (eg leg elastic body) is disposed.

Referring to FIG. 9 , the waist elastic sheet 35 extends from both ends 35A and 35B located on the joint line 18A and 18B side in the upper part 51 of the leg opening 15 in the waist circumferential direction. The width gradually becomes narrower toward the central portion 35C of the center portion, and the width becomes narrowest in the central portion (the narrowest portion) 35C. Similarly, the leg elastic sheet 27 gradually increases in width from both end portions 27A and 27B located on the joining line 18A and 18B side toward the central portion (the narrowest portion) 27C in the waist circumferential direction. It is narrow, and the width is the narrowest in the central portion 27C. Since the waist elastic sheet 35 and the leg elastic sheet 27 have such a shape, both ends 27A, 27B, 35A, 35B of both sheets located on the side of the joining line 18A, 18B have a wearer's body It is stably fitted to the part where the thigh part is attached, where the gap between the diaper 10 and the diaper 10 is most likely to occur, and the central part 27C, 35C is brought into contact with the vicinity of the lumbar spine and the outer part of the thigh with the least movement in the body, Compared to the case where the entire elastic sheet is formed to have the same width, it is possible to realize appropriate fit to the body while suppressing material cost. On the other hand, by displacing the narrowest part 35C of the waist elastic sheet 35 and the narrowest part 27C of the leg elastic sheet 27 slightly forward from the central part of each length dimension, , Since a wide area can be located on the buttocks side, the front part of the leg opening is larger than the rear part, closer to the line of the leg opening of the underwear, and it is easier to fit the body together with the underwear.

<Example of modification>

Fig. 10 is the same sectional view as Fig. 5 of the diaper 10 in one example of a modified example. In this modification, in the high rigidity region 41, an auxiliary sheet 70 made of elastic or inelastic fibrous nonwoven fabric is attached to the skin facing surface side of the side sheet 25 (or first side sheet 25A) with an adhesive. is fixed by By arranging the auxiliary sheet 70 in the high rigidity region 41 in this way, the number of laminates is larger than that of the low rigidity region 42, and the difference in stiffness between the regions 41 and 42 becomes clear. The auxiliary sheet 70 may be fixed not to the skin-facing surface side of the side sheet 25 but to the non-skin-facing surface side, or may be formed of a plurality of sheets instead of one sheet.

In addition to the materials described in the specification, various known materials commonly used in this type of article can be used for each constituent member constituting the diaper 10 of the present invention without limitation. In addition, in the specification and claims, the terms "first" and "second" are used simply to distinguish the same elements, positions, and the like.

10: diaper
11: front waist area
12: back waist area
13: crotch area
14: waist opening
15: leg opening
16: diaper body
17: waist belt
18A, 18B: junction line
21: inner layer sheet
22: outer layer sheet
23: absorber
25: side seat
26: leg elastic
30: elastic sheet
33: waist elastic
40: side flap
41: high rigidity area
42: low rigidity area
70: elastic sheet
P: vertical centerline
X: horizontal direction
Y: portrait orientation

Claims (7)

A diaper body having a longitudinal direction and a transverse direction, and a vertical center line dividing the dimension in the transverse direction into two parts, and having front and back waist regions, a crotch region located between the front and back waist regions, and an absorbent body, and the front and back waist regions. A disposable diaper having a pair of waist belts for connection, a waist opening and a pair of leg openings,
the pair of waist belts are joined to the diaper body in the front and rear waist regions through joint lines having a smaller distance from each other from the leg opening side toward the waist opening side;
The diaper body has side flaps extending in the longitudinal direction outside the transverse direction of both edge portions of the absorbent body, and the side flaps have a higher height than other regions in the edge portions extending along the leg openings. It has a high-stiffness region having rigidity, and both ends of the high-stiffness region are located on the joining line,
The diaper body includes a liquid-permeable inner layer sheet, a liquid-impermeable outer layer sheet, the absorber positioned between the inner and outer layer sheets, and a pair of side sheets disposed on opposite sides of the absorber, wherein the side sheets The high rigidity region is formed by disposing a separate elastic sheet on the sheet,
The diaper according to claim 1 , wherein the side sheet has a first sheet positioned on a side facing the skin and a second sheet positioned on a non-skin facing side, and the elastic sheet is positioned between the first and second sheets. A diaper body having a longitudinal direction and a transverse direction, and a vertical center line dividing the dimension in the transverse direction into two parts, and having front and back waist regions, a crotch region located between the front and back waist regions, and an absorbent body, and the front and back waist regions. A disposable diaper having a pair of waist belts for connection, a waist opening and a pair of leg openings,
the pair of waist belts are joined to the diaper body in the front and rear waist regions through joint lines having a smaller distance from each other from the leg opening side toward the waist opening side;
The diaper body has side flaps extending in the longitudinal direction outside the transverse direction of both edge portions of the absorbent body, and the side flaps have a higher height than other regions in the edge portions extending along the leg openings. It has a high-stiffness region having rigidity, and both ends of the high-stiffness region are located on the joining line,
A plurality of leg elastic bodies extending in the longitudinal direction are disposed in the high rigidity region;
The leg elastic bodies are disposed between laminated sheet members in the high rigidity region, a plurality of waist elastic bodies are disposed on the waist belt, and the leg elastic bodies and the waist elastic bodies are disposed in the thickness direction of the sheet member. A diaper, characterized in that they do not overlap with each other. The diaper according to claim 1 or 2, wherein the high rigidity region has a width of 3 to 30 mm.
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