JPH0677721U - Disposable diaper - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a three-dimensional pants type disposable diaper for infants and incontinent persons. [Structure] Absorbent pad structure having a liquid-permeable top sheet, a liquid-impermeable barrier sheet, and an absorbent body interposed between the sheets, and a waist opening, leg openings, crotch part, and sandwiching the crotch part The back sheet having the front body and the back body arranged, and the side seams formed by adhering both side edges of the back sheet to each other, the absorbent pad structure has elastic elastic members on both side edges of the top sheet. And a flap formed by bending a top sheet so as to wrap the elastic elastic member, the back sheet is made of a non-elastic elastic material, and the elastic elastic member is disposed before and after the waist opening. A three-dimensional pant-type wearer characterized by having a structure in which the stretchable elastic members disposed in the other portions except the central portion and the leg openings are covered with, for example, side sheets having stretchable elastic characteristics. Diaper.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a three-dimensional pants type disposable diaper which is used as a diaper for infants or incontinent persons.

[0002]

[Prior art]

 A three-dimensional pants-type diaper is known in which an absorbent pad structure including a top sheet, a barrier sheet, and an absorber placed between both sheets is mounted on a back sheet having elastic elasticity. 1-503473).

[0003]

[Problems to be solved by the device]

 The absorbent pad structure consisting of the above-mentioned conventional top sheet, barrier sheet, and absorber placed between both sheets is mounted on a back sheet having elastic elasticity. Since the stretchable elastic member is installed only for the purpose, the leak prevention and the fitting property were not perfect. In addition, it is difficult to mount the absorbent pad structure on the backsheet having elastic elasticity so as not to restrict the elasticity.

The present invention eliminates the above-mentioned drawbacks of the conventional pants-type diaper, improves the wettability and fits at the leg openings of the pants, and strengthens the attachment of the absorbent pad structure to the back seat. And it is intended to make it easy.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides an absorbent pad structure having a liquid-permeable top sheet, a liquid-impermeable barrier sheet, and an absorbent body placed between the sheets, a waist opening, leg openings, and a crotch part. Section, a back seat having a front body and a back body arranged with the crotch portion sandwiched between the back seat and side edges formed between the leg openings and the waist opening of the back seat, which are formed by adhering them to each other. In a three-dimensional pants type disposable diaper composed of a seam, the absorbent pad structure has elastic elastic members arranged in the longitudinal direction of both side edges of the top sheet, and the elastic elastic member is wrapped around the top. The back sheet is made of a non-stretchable elastic material, and a plurality of stretchable elastic members are arranged in the waist opening and leg openings of the back sheet. It has a structure in which side sheets cover the elastic elastic members arranged in the leg openings and both end portions of the elastic elastic members arranged in the front body and the rear body of the opening, except for the central portion, and the above-mentioned absorbability is provided. The pad structure is characterized in that it is fixed to the back sheet over the entire length in the longitudinal direction of the portion of the back sheet not covered with the side sheet. As the side sheets in the three-dimensional pants type diaper of the present invention having the above structure, those which can reinforce the back sheet are used, and it is particularly preferable to use a sheet having elastic elasticity. Further, as the absorbent body, one having a plurality of laminated structures made of fluff pulp and having a non-woven fabric disposed between the layers can also be used.

[0006]

[Action]

 The disposable diaper of the present invention having the above structure has a flap formed by a top sheet provided on the absorbent pad structure to form a leak preventive wall, and in particular, a stretch elastic member disposed at the leg opening prevents leakage. In addition to its function, it also double-acts to prevent leakage from the leg openings. In addition, the side sheet attached to the back sheet suppresses the expansion of the back sheet, which is a sheet that has a property of easily expanding when a tensile force is applied, such as a hydroentangled nonwoven fabric, and suppresses the expansion of the absorbent sheet structure. The side sheet is made of a sheet having stretchable elastic properties, so that even if a stronger tensile force acts to cause irreversible elongation of the back sheet, the side sheet stretches and contracts. The backsheet is returned to its original state due to the contraction force of the side sheet having elastic properties, and the initial fit and leak prevention function are not impaired.

[0007]

【Example】

 Hereinafter, the present invention will be described in more detail with reference to the drawings showing the embodiments, but the present invention is not limited to these embodiments. FIG. 1 is a perspective view of a three-dimensional pants type disposable diaper 1 showing an embodiment of the present invention. The three-dimensional pants-type disposable diaper 1 of FIG. 1 has a waist opening 2 and leg openings 3, and an elastic elastic member 5 (see FIG. 2) is attached to at least a part of the waist portion of the back sheet 4, The front seam 6 and the rear seam 7 are formed by extending between both openings, and side seams 8 are formed by adhesively closing both side edges.

[0008] The side seam 8 is adhesively closed by overlapping the front body 6 and the back body 7 via the crotch portion of the back sheet 4 so that the absorbent pad structure 9 is on the inner side, and protruding both side edges to the outside. In this state, both side edges are joined by hot melt pre-adhesive, pressure melting, ultrasonic wave, etc. This joining may be performed in any state such that both side edges project inward, one side edge faces outside, and the other side edge faces inward.

FIG. 2 is an exploded perspective view of the absorbent pad structure 9 and the backsheet 4 in an expanded state where the side seams of the three-dimensional pants type diaper 1 of the present invention shown in FIG. And an absorbent pad structure 9, a waist elastic member 5 and side sheets 16. FIG. 3 is a perspective view in which the side seams of the three-dimensional pants-type diaper 1 are opened and developed. 4 is a sectional view taken along the line AA 'in FIG. 3, and FIG. 5 is a perspective view of the waist portion in FIG.

As shown in FIGS. 2 to 5, the absorbent pad structure 9 includes a liquid-permeable top sheet 10, a liquid-impermeable barrier sheet 11, and a length between the sheets that is smaller than the sheets. And an absorbent body 12 having a width are interposed, and at least one elastic elastic member 14 is disposed at least at the central portion in the longitudinal direction of both side edges of the top sheet 10 so as to wrap the elastic elastic member 14. It has a flap 13 formed by bending. The base end portion 20 of the flap is positioned on the absorbent body 1 to 30 mm inward from both side edge positions of the absorbent body. Further, the flap 13 has a structure in which both free edges in the longitudinal direction are tilted outward or inward and the flap 13 is attached to the top sheet 10.

As shown in FIGS. 3 and 4, in the absorbent pad structure 9 having the above-described structure, when the elastic elastic member 14 is left unconstrained, the elastic elastic member 14 freely contracts and the longitudinal direction of the flap 13 is reduced. The center part rises three-dimensionally and becomes a leak prevention wall to prevent leakage. The top sheet 10 used here has water repellency by coating a water repellent agent on both side edges forming a leak preventive wall in order to prevent leakage. As the position of the base end portion 20 of the flap, a position inside 1 to 30 mm from both side edges of the absorbent body is suitable. If the position is 1 mm or less, urine pool is likely to be formed, and conversely, if the position is 30 mm or more from the side edge of the absorber, the urine absorption area is narrowed and conversely leaks easily. As a method of tilting the flap 13 outward or inward and adhering the free edges in the longitudinal direction of the flap 13 and the top sheet 10 to each other, a method using a hot melt adhesive, a heat seal welding method, an ultrasonic welding method, etc., or a combination thereof is used. There is a method by.

A liquid-permeable nonwoven fabric made of polyethylene, polypropylene, or other thermoplastic fiber is used for the top sheet 10.

The elastic elastic members 14, leg opening elastic elastic members 15 and waist elastic elastic members 5 arranged on the free edges of the flaps are made of a normal paper diaper such as urethane film, urethane thread, urethane foam, thread rubber, etc. The ones used in can be used as they are. Further, the elastic elastic members are respectively arranged in a stretched state at the free end of the flap 13, the leg opening portion and the waist portion, and are bonded and fixed by a hot melt adhesive.

As shown in FIG. 4, the flap is located inside the elastic member of the leg opening. By disposing a plurality of elastic members 15 in the leg openings, it is possible to fit a wide planar area around the leg well and to minimize leakage from around the leg.

The absorbent body 12 is preferably composed of fluff pulp as a main material and a super absorbent polymer in combination, and other absorbent paper alone or a mixture or laminate of heat-fusible fibers is used. It is more preferable that the upper layer 17 has a fluff pulp, and the lower layer 18 has a laminated structure in which fluff pulp and superabsorbent polymer are mixed or laminated, and a nonwoven fabric 19 is disposed between the layers to prevent the absorber from losing its shape. Further, the shape of the absorber 12 may be an hourglass type or a rectangular type, but the hourglass type can obtain a better fit property.

As the barrier sheet 11, a liquid-impermeable polyethylene sheet, a moisture-impermeable liquid-impermeable sheet obtained by adding a filler to a thermoplastic resin and stretching, and a non-woven fabric bonded to the entire surface of the film to improve the touch. A composite material or a composite material in which a non-woven fabric is attached to both side edges of the film is used.

As the side sheet 16 having elastic elasticity, an elastomer nonwoven web alone is preferable, but at least one side of the elastomer nonwoven web is made of polyester fiber such as polyethylene terephthalate fiber, polyolefin fiber, nylon fiber, or the like. Hydro-entangled or laminated webs of fibrous layers made of materials selected from the group including polyamide fibers, cellulosic fibers such as cotton fibers, pulp fibers and mixtures thereof may also be used.

Further, the fiber layer is hydroentangled or laminated on the elastomer nonwoven web on at least one surface of a polyurethane-based film having a moisture permeability and elasticity of 5 to 40 μm thickness, a natural rubber sheet, and a foamed sheet. A web or a hydroentangled nonwoven fabric may be laminated and laminated. The laminated lamination may be partial such as the central region of the web, one side edge, both side edges. The method for laminating may be any of pressure fusion bonding by hot embossing, bonding with a hot melt adhesive, ultrasonic bonding and the like.

Further, the side sheet 16 has a basis weight of 20 to 70 g / m ² , an elastic response at 50% elongation of 300 g / 25 mm width or less in both longitudinal and transverse directions, and a recovery rate at stress relaxation of 80% or more. It is preferable to have elastic properties.

The non-stretchable elastic back sheet 4 includes polyester fibers such as polyethylene terephthalate fibers, polyolefin fibers, polyamide fibers such as nylon fibers, cellulose fibers such as cotton fibers, pulp fibers and mixtures thereof. It is obtained by hydroentangling fibers selected from materials. A hydrophilic or water repellent non-woven fabric is used. These non-woven fabrics stretch when a tensile force is applied, but they do not have the shrinkability that they return to when they are released from the tensile force.

As shown in FIG. 2, the absorbent pad structure 9 is attached to the back seat 4 by the total length in the longitudinal direction of the central part of the back seat 4 excluding the side edges covered by the side seats 16, and The side sheet 16 is bonded and fixed to the entire length in the longitudinal direction of the portion 24 using, for example, the hot melt adhesive 21 continuously or discontinuously arranged in a stripe shape. The adhesive width of the side sheet is preferably 1 to 20 mm from the side edge of the central portion of the side sheet.

As shown in FIG. 5, the waist elastic member 5 is disposed between the back sheet 4 and the barrier sheet 11 and the side sheets 16 at both longitudinal ends of the absorbent pad structure 9. Further, by disposing a plurality of elastic elastic members 15 in the leg openings, it is possible to fit a wide planar area well around the legs and minimize leakage from around the legs.

[0023]

[Effect of device]

 As described above, according to the present invention, it is possible to provide a diaper that does not leak excrement, has a good fit property, has excellent moisture permeability, and has a good feel to the wearer, which can be comfortably worn by the wearer. Become.

[Brief description of drawings]

FIG. 1 is a perspective view of a three-dimensional pants type disposable diaper of the present invention.

FIG. 2 is an exploded perspective view of an absorbent pad structure and a back sheet of the three-dimensional pants type diaper shown in FIG.

FIG. 3 is a perspective view of the three-dimensional pants-type diaper of the present invention when the elastic elastic member arranged on the flap of the diaper is left unconstrained.

4 is a schematic view of the disposable diaper of the present invention shown in FIG.
Sectional drawing when it cut | disconnects by the A'line.

FIG. 5 is a perspective view of a waist portion of the diaper according to the present invention shown in FIG.

[Explanation of symbols]

1: Three-dimensional pants type disposable diaper, 2: Waist opening, 3: Leg opening, 4: Back sheet, 5: Waist elastic elastic member, 6: Front body, 7: Back body, 8: Side seam, 9: Absorbent pad structure, 10: Top sheet, 1
1: Barrier sheet, 12: Absorber, 13: Flap, 1
4: Stretchable elastic member, 15: Leg opening stretchable elastic member, 1
6: Side sheet, 17: Upper layer absorbent body, 18: Lower layer absorbent body, 19: Interlayer nonwoven fabric, 20: Base end portion of flap, 2
1: Adhesive layer

Front page continuation (72) Creator Mie Takahashi 1-10-6 Shinonome, Koto-ku, Tokyo Oji Paper Co., Ltd. Research Center

Claims (2)

[Scope of utility model registration request] 1. An absorbent pad structure having a liquid-permeable top sheet, a liquid-impermeable barrier sheet, and an absorbent body interposed between the sheets, a waist opening, a leg opening, a crotch part, and the crotch part. It is composed of a back sheet having a front body and a back body, which are arranged so as to be sandwiched, and side seams formed by adhering both side edges extending between the leg opening portion and the waist opening portion of the back sheet to each other. In the three-dimensional pants type disposable diaper, the absorbent pad structure has elastic elastic members arranged in the longitudinal direction of both side edges of the top sheet, and the top sheet is bent so as to wrap the elastic elastic members. The back sheet is made of a non-stretchable elastic material, and stretchable elastic members are disposed in the waist opening and leg openings of the back sheet. The elastic pad member has a structure in which both ends of the elastic member provided on the body except the central portion and the elastic members provided at the leg openings are covered with side sheets, and the absorbent pad structure is the back sheet. A three-dimensional pants-type disposable diaper, which is fixed to the back sheet over the entire length in the longitudinal direction of the central portion which is not covered with the side sheet. 2. The side sheet has a stretchable elastic property, and an end portion of the bottom surface of the absorbent pad structure is fixed to a part of the side sheet over the entire length in the longitudinal direction. A three-dimensional pants-type diaper that you can use.