JP2002306532A - Disposable briefs type diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the adhesive property of a disposable briefs type diaper around the legs. SOLUTION: A disposable briefs type diaper 1 has an elastic stretchable body opening 6 and leg openings 7. The peripheral edge part of each of leg openings 7 is composed of a first portion 20a forming an inside portion around the leg and a second portion 20b forming an outside portion around the leg. The extension stress of the second portion 20b around the leg is greater than that of the first portion 20a around the leg and between the first portion 20a and the second portion, such extension stress is discontinuously changed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a disposable pants-type diaper.

[0002]

2. Description of the Related Art Conventionally, a front waist portion, a rear waist portion, and a crotch portion located between these two portions are formed, and each of these portions forms a waist opening and a pair of leg openings. Disposable pants-type diapers are well known. Also, pants-type diapers in which an elastic member extending in the waist direction is attached to the peripheral portion of these openings are well known. When the sheet material forming the front and rear waist parts and the crotch is inelastic, the elastic member is attached to the sheet material in an extended state. If the sheet material is elastically extensible, the elastic member is attached in an extended state or a non-extended state.

[0003]

In the diaper of the prior art, the elastic member attached to the peripheral edge of the leg opening may be extended uniformly in the direction around the leg or from the inside to the outside around the leg. The elongation rate may change continuously and gradually. In such a diaper, depending on the movement of the wearer's leg, for example, when both legs are greatly spread outward, the inner portion of the diaper leg opening peripheral edge should be in contact with the inner part around the leg, that is, the inner thigh. In some cases, the part cannot follow the movement of the leg, and a gap is formed between the part and the inner crotch part, and excrement may leak from the part.

[0004] The present invention relates to an improvement in a disposable pants-type diaper in which the peripheral edge of the leg opening is elastically stretched, and an object of the present invention is to enable the peripheral edge of the leg opening to follow the movement of the inner crotch well. .

[0005]

In order to solve the above problems,
The present invention is directed to a pants shape having a waist opening and a pair of leg openings defined by a front waist portion, a rear waist portion, and a crotch positioned between these two portions, The opening is a disposable pants-type diaper in which the periphery of each opening is elastically stretchable in the respective circumferential directions.

[0006] In such a diaper, the present invention is characterized in that the peripheral portions of the pair of leg opening portions form inner portions around the leg portions so as to be able to contact the inner crotch of the diaper wearer. And a second portion forming an outer portion around the leg, wherein the second portion has an extension stress in the leg circumference direction greater than the extension stress in the first portion in the leg circumference direction, and the first portion And that the elongation stress changes discontinuously between the second part and the second part.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS With reference to the accompanying drawings, the details of the disposable pants-type diaper according to the present invention will be described.
It is as follows.

A disposable pants-type diaper 1 shown in a perspective view in FIG. 1 has a front waist portion 2, a rear waist portion 3 and a crotch portion 4.
And has a waist opening 6 and a pair of leg openings 7. The front waist portion 2 occupies the front half of the entire waist, and a central portion 8 in the waist direction is formed by the front seat 11, and both outer regions 9 of the central portion 8 and the rear waist portion 3 are formed. Is formed by a rear seat 12, and a front seat 11 extends to a rear portion of the crotch portion 4. The front seat 11 and the rear seat 12 are
Along the side edge 13 of the rear seat 12 extending vertically in the front waist portion 2, the rear seat 12 overlaps and is joined to each other, and the lower part of the front seat 11 extending in the width direction of the diaper 1 behind the crotch portion 4. It overlaps and joins along the edge 14.

At the periphery of the waist opening 6, the rear seat 1
A waist elastic member 16 made of a plurality of elastic yarns 15a is attached to the inner surface of the body 2. The elastic member 16 in the illustrated example
Extends in the waist direction between the side edges 13 and 13 of the rear seat 12, but may extend beyond the side edge 13 to the front seat 11 if necessary in the diaper 1. Good.

The periphery of the leg opening 7 is formed in the lower portion 20a which is in contact with the inside of the leg around the wearer of the diaper 1, ie, the inner thigh.
And a lower elastic member 17 composed of a plurality of elastic threads 15b is attached to the front sheet 11 forming the lower portion 20a. An upper elastic member 18 composed of a plurality of elastic yarns 15c is attached to the rear sheet 12 forming the above. The lower and upper elastic members 17, 18 cooperate with each other to form a ring when the diaper 1 is in the state shown in FIG. The ring formed by the elastic members 17 and 18 when the diaper 1 is viewed from the front has an inner diameter h extending in the height direction, and the elastic members 17 and 18 are connected at the height p in front of the crotch portion 4, Inseam 4
At the height q. These heights p and q are values measured from a reference line b extending horizontally from the inside of the ring when measuring the inner diameter h, and are 30 to 30 of the inner diameter h.
It is in the range of 70%. The illustrated height p is the height from the reference line b to the position where the side edge 13 of the rear seat 12 intersects the lower elastic member 17, and the height q is from the reference line b to the position below the front seat 11. Height up to edge 14.

FIG. 2 shows the diaper 1 of FIG.
FIG. 2 is a partially exploded development view of the diaper 1 obtained by cutting open along the side edge 13 of FIG. The diaper 1 has a body fluid absorbing panel 21 inside. The panel 21 has a liquid-permeable top sheet 22 in contact with the skin of the diaper 1 wearer and a liquid-impermeable back sheet 23 in contact with the inner surface of the rear sheet 12.
And an absorbent core material 24 interposed between the front and back sheets 22 and 23. The front and back sheets 22 and 23 extend from the peripheral edge of the core material 24, overlap, and are joined to each other to form a peripheral edge flap 26. Portions 27 and 28 of the flap 26 located before and after the diaper 1 are connected to the front sheet 11 and the rear sheet 12 via an adhesive (not shown).
And joined to. The panel 21 also includes a back sheet 23.
Are bonded to the inner surfaces of the front sheet 11 and / or the rear sheet 12 via an adhesive (not shown). The core material 24 is made of ground pulp or a mixture of ground pulp and superabsorbent polymer particles, and is covered with a water-permeable sheet 25 such as tissue paper. Although the panel 21 has an hourglass shape in the illustrated example, it can be replaced with a rectangle or any other suitable shape.

The front seat 11 and the rear seat 12 shown in FIG. 2 are stacked with the lower edge 14 of the front seat 11 facing upward. The lower elastic member 17 is attached to the inner surface of the front sheet 11 via an adhesive (not shown), and
Of the front seat 11 along the edge of the leg opening. The upper elastic member 18 is attached to the inner surface of the rear sheet 12 via an adhesive,
It extends from the vicinity of the lower edge 14 to the side edge 13 along the edge of the leg opening. The waist elastic member 16 of the rear seat 12
Extends between the side edges 13 and 13. The diaper 1 of FIG. 2 is folded so that the panel 21 is on the inner side along a center line CC that bisects the dimension in the front-rear direction (vertical direction in the figure), and the side edge 13 of the rear sheet 12 is 1 is overlapped with the vicinity of the side edge 31 of the front sheet 11 such that the side edge 13 is on the outside, and the diaper 1 in FIG. 1 is obtained.

In the diaper 1, the upper elastic member 1
For 8, a material having a larger extension stress than the lower elastic member 17 is used. For example, the sum of the elongation stresses of the plurality of elastic yarns 15 c forming the upper elastic member 18
Is made larger than the sum of the elongation stresses of the plurality of elastic yarns 15b that form. By doing so, when the diaper 1 wearer's leg moves, the lower elastic member 17 extending along the inner crotch is stretched by being pulled by the upper elastic member 18 having a higher elongation stress, so that the leg moves well. There is no gap between the diaper 1 and the inner crotch. Such a lower elastic member 17 has a stress at 30% elongation of 0.3 to 0.3%.
The upper elastic member 18 has a stress at 30% elongation in the range of 1.5 to 7.0 N, and the difference between the elongation stresses of the two elastic members 17 and 18 is 0.7 to 5 N. It is preferably in the range of 0.0N. Further, in these stress ranges, it is more preferable that the stress of the upper elastic member 18 at 30% elongation is at least twice the stress of the lower elastic member 17 at 30% elongation. As described above, since the leg elastic members 17 and 18 forming the ring are made of separate members, the elongation stress between the two elastic members 17 and 18 is discontinuously changed, so that a large difference is generated between the two elongation stresses. Can be attached. When the extension stress of the elastic member around the leg is continuously changed as in the prior art, as in the diaper 1,
It is difficult to change the extension stress extremely inside and outside around the leg.

The front seat 11 and the rear seat 1 of the diaper 1
For 2, a liquid-impermeable sheet, more preferably a gas-permeable and liquid-impermeable sheet is used, but the present invention can also be carried out using a liquid-permeable sheet. When these two sheets 11 and 12 are non-stretchable, the lower elastic member 17, the upper elastic member 18, and the waist elastic member 16 are attached to these sheets 11 and 12 in an extended state. When the two sheets 11 and 12 are elastic elastic sheets, the lower elastic member 17, the upper elastic member 18, and the waist elastic member 16 are attached in an extended state or a non-extended state in the expansion and contraction direction.

Further, in the diaper 1, the front seat 11
It is also possible to use a non-stretchable sheet for the rear sheet 12 and an elastically extensible sheet for the rear sheet 12. When the diaper 1 of FIG. 1 is made of these sheets 11 and 12, the extension stress around the leg is applied by the elastic yarn 15b in the lower portion 20a around the leg, while the elastic yarn 15b is applied in the upper portion 20b around the leg. 15c and elastic rear sheet 12
And given by Therefore, in this diaper 1,
Even if the elastic yarns 15b and 15c are a series, and the elongation stress between the two elastic yarns 15b and 15c continuously changes gradually, the elongation stress of the upper portion 20b does not increase.
Cooperates with the elastic sheet so that the lower part 20a
Higher than the tensile stress of the two portions 20a, 20a.
The elongation stress changes discontinuously between b. This diaper 1
The lower elastic member 17 around the leg in FIG.
5b, the upper elastic member 18 is formed by a plurality of elastic yarns 15c and the rear sheet 12 having elasticity.

In the diaper 1 according to the present invention, a sheet material such as woven fabric, nonwoven fabric, plastic film or the like having a good touch is superimposed on the inner surfaces of the front sheet 11 and the rear sheet 12, and each elastic member 16, 17 is made of this sheet material. , 18 can be covered.

[0017]

According to the disposable diaper according to the present invention, the elastic stretchable leg circumference is divided into a lower portion forming an inner portion around the leg and an upper portion forming an outer portion around the leg, and the upper portion is formed. Since the elongation stress can be changed discontinuously between the lower part and the elongation stress in the upper part, the elongation stress in the upper part can be much larger than that in the lower part. With this diaper, the lower part around the leg with a small elongational stress well follows the movement of the inner thigh and does not create a gap between the diaper and the inner thigh.

[Brief description of the drawings]

FIG. 1 is a perspective view of a disposable pants-type diaper.

FIG. 2 is a partially exploded development view of the diaper of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disposable pants-type diaper 2 Front waist part 3 Rear waist part 4 Crotch part 6 Waist opening 7 Leg opening 12 Sheet (rear seat) 15b Elastic thread 15c Elastic thread 16 Elastic member 17 First elastic member (downward elasticity) 18) 2nd elastic member (upper elastic member) 20a 1st part (lower part) 20b 2nd part (upper part)

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takako Uozawa 1531-7 Wadahama Takasuka, Toyohama-cho, Mitoyo-gun, Kagawa Prefecture F-term in Unicharm Co., Ltd. Technical Center 3B029 BD10 BD13 4C098 AA09 CC07 CC12 CC27 CE05 DD23

Claims (6)

[Claims] 1. A pants shape having a waist opening and a pair of leg openings is defined by a front waist portion, a rear waist portion, and a crotch portion located between these two portions. In a disposable pants-type diaper whose portions are elastically extensible in respective circumferential directions, the peripheral portions of the pair of leg-around openings form inner portions around the legs so as to correspond to the inner thighs of the diaper wearer. First accessible
And a second portion forming an outer portion around the leg, wherein the second portion has an extension stress in the leg circumference direction greater than the extension stress in the first portion in the leg circumference direction, and the first portion The above-mentioned diaper, wherein the elongation stress changes discontinuously between the diaper and the second part. 2. A stress at 30% elongation of the second portion in a range of 1.5 to 7.0 N, and 30% of a stress of the first portion is 30%.
The diaper according to claim 1, wherein the stress at the time of elongation is in the range of 0.3 to 2N. 3. The stress at 30% elongation of the second portion is:
The diaper according to claim 1 or 2, wherein the stress is at least twice as large as the stress at the time of elongating the first portion by 30%. 4. The diaper according to claim 1, wherein at least one of said first and second portions is provided with said elongation stress by a plurality of elastic yarns parallel to each other in a leg circumferential direction. 5. The diaper according to claim 1, wherein the rear waist portion includes a sheet having elastic extensibility, and the sheet forms the second portion. 6. The sheet forming the second portion is provided with an elastic thread extending in a leg-circumferential direction, and the second portion is provided with the extension stress by the sheet and the elastic thread. A diaper according to any one of the above-mentioned items.