JP3263659B2 - Disposable briefs - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to disposable briefs. This brief can also be applied to disposable diapers and disposable training pants.

[0002]

2. Description of the Related Art Disposable briefs, for example, are disclosed in
-16920, and 3-16923. Among them, in the technology disclosed in Japanese Utility Model Laid-Open Publication No. 3-16923, the top sheet of the brief is a stretchable nonwoven fabric, and the backsheet is formed by joining the stretchable nonwoven fabric and the stretchable insole sheet. This brief has good fit due to the use of these elastic materials.

[0003]

As described above, by making all of the top sheet, the back sheet and the insole sheet made of a stretchable material, almost all of the briefs can be made stretchable. While this brief has an extremely good fit, there is a problem that air permeability is sacrificed by using an impermeable plastic sheet for the stretchable insole sheet. Therefore, in the case of the above-mentioned known technique, the problem is solved by making the size of the insole sheet smaller than the size of the nonwoven fabric. However, stretchable plastic sheets and stretchable nonwoven fabrics suitable for insole sheets generally have a tendency to be costly in any of their raw materials and manufacturing processes as compared to non-stretchable materials. Are known. For this reason, this kind of elastic brief has a problem that it imposes a considerable economic burden on general consumers.

SUMMARY OF THE INVENTION The present invention aims to solve the above-mentioned problems of the prior art by reducing or eliminating the use of a stretchable material by arranging elastic members widely in the waist opening.

[0005]

The present invention for solving the above-mentioned problems has the following features.

The present invention has a front and rear area including a water-permeable top sheet, a water-impermeable back sheet, a water-absorbing core interposed between the two sheets, and a crotch area. of that side edges are joined, the waist opening portion, and a pair of leg openings are formed in the front rear region including a region where the waist opening and the core is positioned to the waist direction It is assumed that the disposable brief has a waist elastic member extending and a leg elastic member extending in the leg opening direction at the leg opening.

According to the present invention, based on the above premise, the waist elastic member includes a plurality of first elastic ribbons extending substantially parallel to an edge of the opening at the waist opening; Is separate from the elastic ribbon of
Has a weak tensile stress than tensile stress of the elastic ribbon, said first second elastic ribbon plurality of in the front rear region below the elastic ribbon extending Egai the sinusoidal curve to the waist direction Wherein the second elastic ribbon comprises:
A large number of mesh loops are formed by the sinusoidal curve .

In a preferred embodiment of the present invention, the first elastic ribbon has an elongation ratio of 1.2 to 3.0 times,
The elongation stress at that time is 15 to 150 g per 100 mm length
And the extension ratio of the second elastic ribbon is 1.1 to 1.1.
2.5 times, the elongation stress at that time is 5 mm per 100 mm length
80 g.

In another embodiment of the present invention, the first and second elastic ribbons have a denier of 300 to 1000.

[0010] In still another embodiment of the present invention, the back sheet is a laminate of a non-stretchable plastic film and a non-stretchable nonwoven fabric, and the nonwoven fabric is located outside a brief.

[0011]

According to the present invention, since the second elastic ribbon located below the first elastic ribbon forms a large number of mesh-like loops, the area where the second elastic ribbon is located is limited. The wearer can be pressed substantially evenly over the entire area and weaker than the waist opening where the first elastic ribbon is located, and this area gives the wearer an unpleasant feeling of pressure, If not, it does not interfere with the infant's abdominal breathing.

Further, since the second elastic ribbon partially forms a mesh-like loop, the individual mesh-like loops cause wrinkles in the top sheet and the back sheet as the elastic ribbon shrinks, so that the briefs and the brief sheets are formed. It reduces the area of contact with the body and helps to improve ventilation.

[0013]

An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a perspective view of the brief 1. The brief 1 has a pair of leg opening 2 and a waist opening 3 and has a leg elastic member 4 and a waist elastic member 5 attached thereto. FIG. 2 is an exploded perspective view of the brief 1. FIG. The brief 1 includes a water-permeable top sheet 8, a water-impermeable back sheet 9, a mat-shaped water-absorbing core 10, leg elastic members 4, and waist elastic members 5. The front and back sections 13 and 14 of the top and back sheets 8 and 9 form waist sections, and the crotch section 15 located therebetween has cutout edges 16 of the leg opening 2 on both side edges. In the back sheet 9, an air-permeable and water-impermeable plastic sheet 12 on the inner surface is bonded to a soft and air-permeable non-woven fabric 11 on the outer surface by an adhesive or a fusion means. With this configuration, the back sheet 9 is air-impermeable. The upper surface of the plastic sheet 12 is provided with a water-absorbing core 1 so that it can expand and contract.
0 is intermittently joined by an adhesive or a fusion means. An elastic member 4 around the leg is arranged on the crotch area 15 of the top and / or backsheets 8 and 9, and an elastic member 5 is arranged on the end for opening the waist. Each elastic member is preferably in the form of a ribbon, which is intermittently bonded to the topsheet 8 and / or the backsheet 9 with an adhesive under elongation. The laminated body thus configured is vertically folded in two at its central portion, and both side edges of the front and rear sections 13 and 14 are joined by heat sealing means to form a waist opening 3 and a pair of leg opening. 2 and the brief 1 shown in FIG.

In the brief 1, a large number of gathers are formed in the leg opening 2 and the waist opening 3 due to contraction of the elastic members 4 and 5. In the waist opening 3, two types of elastic ribbons 6, 7 constituting the elastic member 5 are widely arranged so as to reach the core 4 from the edge of the opening 3 to the crotch area 15. A plurality of elastic ribbons 6 arranged edge substantially parallel in the vicinity of the edge of the opening 3 are a plurality of elastic ribbons 7 also in the crotch region 15 toward the opening 3 arranged to draw a sinusoidal curve, There is. Sinusoidal curves contact each other at the top portion, or overlap, many small reticulated loop that continuously in a direction crossing the waist direction and this 18
Is formed.

The elastic ribbon 6 has an elongation ratio of 1.2 to 3.
It is used in the range of 0 times, and the elongation stress at that time is 10
It is 15 to 150 g per 0 mm length. The elastic ribbon 7 has an elongation ratio in the range of 1.1 to 2.5 times, and the elongation stress at that time is 5 to 80 per 100 mm length.
g. The stretching ratio and the stretching stress of the elastic ribbon 6 are set larger than those of the elastic ribbon 7. Each of the elastic ribbons 6 and 7 can use 300 to 1000 denier. The characteristics of the elastic ribbons 6 and 7 may be appropriately selected in these ranges in consideration of the characteristics of the materials of the top sheet and the back sheets 8 and 9 and the adhesive. By configuring the elastic ribbons 6 and 7 in this manner, the brief 1 can be configured so as to be most closely adhered to the wearer at the waist opening 3 and gradually adhere to the crotch area. . When the elastic ribbon 7 forms the mesh loop 18, many wrinkles are generated in the brief 1 by using the mesh loop 18 as one unit due to the contraction of the elastic ribbons 6 and 7. Thereby, the brief 1 fits well around the waist of the wearer, but the contact area with the wearer's body can be reduced. In addition, air flows between the brief 1 and the body via these wrinkles, and air permeability is good.

The briefs 1 can also be obtained by a configuration in which the elastic members 4 and 5 are joined to a non-stretchable back sheet and combined with a stretchable top sheet.

[Brief description of the drawings]

FIG. 1 is a perspective view of a brief according to the present invention.

FIG. 2 is an exploded perspective view of the brief in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Brief 2 Leg opening 3 Waist opening 4 Leg elastic member 5 Waist elastic member 6 First elastic ribbon 7 Second elastic ribbon 8 Top sheet 9 Back sheet 10 Core 13 Front area 14 Rear area 15 Inseam Zone 18 Reticulated Loop

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-46844 (JP, A) JP-A-60-199903 (JP, A) JP-A-2-177958 (JP, A) 58610 (JP, U) Actually open 63-98305 (JP, U)

Claims (4)

(57) [Claims] 1. A front and rear area comprising a water-permeable top sheet, a water-impermeable back sheet, and a water-absorbing core interposed between the two sheets, and a crotch area. by edges are joined, the waist opening portion, and a pair of leg openings are formed, cylinder the waist opening and the core extends to the waist direction in the front rear region including a region located A disposable brief having a peripheral elastic member and a leg elastic member extending in a leg peripheral direction at the leg opening, wherein the waist elastic member is substantially at an edge of the opening at the waist peripheral opening. A plurality of first elastic ribbons extending in parallel with each other, the first elastic ribbon being separate from the first elastic ribbon, having an extension stress weaker than an extension stress of the first elastic ribbon; The front below the ribbon A plurality of second elastic ribbons extending in a back section in a waist direction in a sinusoidal curve, wherein the second elastic ribbon forms a large number of mesh loops with the sinusoidal curves . The brief, characterized in that: 2. An expansion ratio of the first elastic ribbon is 1.
2 to 3.0 times, the elongation stress at that time is 15 to 150 g per 100 mm length, the elongation ratio of the second elastic ribbon is 1.1 to 2.5 times, and the elongation stress at that time is 10 to 10 g.
The brief according to claim 1, weighing from 5 to 80 g per 0 mm length. 3. The method according to claim 2, wherein the first and second elastic ribbons are each formed of a 30
The brief according to claim 1 or 2, wherein the brief is 0 to 1000 denier. 4. The back sheet according to claim 1, wherein the back sheet is a laminate of a non-stretchable plastic film and a non-stretchable nonwoven fabric, and the nonwoven fabric is located outside a brief. Briefs described.