JPH11267154A - Paper diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the contracting force at respective parts of a diaper type sheet by a plurality of elastic yarns, appropriate. SOLUTION: A plurality of elastic yarns G1... are fixed in a manner to be continuous from a left hip side part 2L of a front body, a left leg periphery part 3L of the front body, a crotch part 4, through a right leg periphery part 3R of the front body, to a right hip side part 2R of the front body, and at the same time, a plurality of elastic yarns G2... are fixed in a manner to be continuous from a left hip side part 5L of rear body, a left leg periphery part 6L of the rear body, the crotch part 4, through a right leg periphery part 6R of the rear body, to a right hip side part 5L of the rear body, for a diaper type sheet 1, and this paper diaper is constituted of the paper type sheet 1 and an absorbing body 10 which is fixed to the internal surface of the paper type sheet 1, and the plurality of respective elastic yarns G1..., G2... are fixed under a bundled state at the crotch part 4 and the hip side parts 2L, 2R, 5L, 5R, and are fixed by placing an interval at other parts, for the paper diaper P.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for connecting a left waist of a front body, a left leg, a crotch, a right leg of a front body, and a right waist of a front body. A plurality of elastic yarns are fixed to the back body, and it continues from the left waist side part of the back body to the left waist part of the back body, the crotch part, the right leg part of the back body, and to the right waist side part of the back body The present invention relates to a disposable diaper in which a plurality of elastic yarns are fixed as described above, and an absorber is fixed to the inner surface of a diaper-shaped sheet in which leg circumference gathers are formed on the right leg circumference and the left leg circumference, respectively. The present invention relates to a disposable diaper in which a contraction force in each portion of a diaper-shaped sheet generated by a plurality of elastic yarns forming a surrounding gather is optimized.

[0002]

2. Description of the Related Art As this type of disposable diaper, a pants-type disposable diaper which has been previously formed into a pants shape and is commercially available has been proposed and used. For example, the pants-type disposable diaper described in Japanese Utility Model Publication No. 3024357 is fixed to a diaper-shaped sheet 101 formed as a laminated sheet such as a nonwoven fabric and an inner surface of the diaper-shaped sheet 101 as shown in FIGS. , Absorber 11 extending back and forth about crotch
0.

[0003] Absorber 110 absorbs between liquid-permeable topsheet 111 formed of a nonwoven fabric or the like and liquid-impermeable backsheet 113 formed of a plastic film or a nonwoven fabric subjected to a water-repellent treatment. The material 112 is sandwiched therebetween and these peripheral edges are fixed.

A plurality of nonwoven fabrics of the diaper-shaped sheet 101 pass through a left waist side portion 102L of the front body, a left leg circumference 103L of the front body, a crotch portion 104, and a right leg circumference 103R of the front body. A plurality of elastic yarns G7 are fixed so as to be continuous to the right waist side part 102R of the front body, and the left waist side part 105L of the back body and the left leg surrounding part 106 of the back body are fixed.
L, a plurality of elastic yarns G8 are fixed so as to be continuous to the crotch portion 104, the right leg side portion 105R of the back body to the right waist side portion 105R of the back body, and around the right leg portion and the left leg portion. Leg gathers 107 are formed in each of the portions.

[0005]

However, in such a conventional disposable diaper, the shrinkage force at each portion of the diaper-shaped sheet caused by a plurality of elastic yarns forming the gathers around the legs is not appropriate. There was the problem shown in (b). (B) Since the contraction force of the plurality of elastic yarns extending in the crotch width direction at the crotch portion is strongly applied to the absorber, the absorber contracts in the width direction and gives discomfort to the adherend. was there. (B) In addition, the elastic force of the plurality of elastic yarns extending in the waist direction at the waist side has a strong contraction force, and a fastening trace is easily formed on the waist side of the adherend.

Therefore, a main object of the present invention is to optimize the contraction force of each part of the diaper-shaped sheet caused by a plurality of elastic yarns forming the gathers around the legs, and
And (b) to solve the problems.

[0007]

Means for Solving the Problems In order to solve the above problems,
The present inventors have measured the contraction force of a diaper-shaped sheet to which a plurality of elastic yarns are fixed by using various types of elastic yarns. It has been found that the contraction force becomes weaker when the width is made narrower than when the width is widened. The reason why this phenomenon occurs is that when a plurality of elastic yarns are fixed to the sheet in close proximity, the degree of expansion and contraction of each elastic yarn restricts the expansion and contraction of other elastic yarns. Conceivable.

[0008] The disposable diaper of the present invention based on the above knowledge includes a left waist side part of a front body, a left leg part of a front body,
A plurality of elastic yarns are fixed so as to be continuous to the right waist side of the front body through the crotch part, the right leg part of the front body, and from the left waist side part of the back body to the left leg part of the back body A plurality of elastic yarns are fixed so as to be continuous to the crotch portion, the right leg side of the back body and the right waist side portion of the back body, and the leg around each of the right leg surrounding portion and the left leg surrounding portion. A diaper-shaped sheet formed with gathers, a liquid-impermeable back sheet, an absorbent and a liquid-permeable top sheet are laminated in this order,
In the disposable diaper constituted by at least the absorbent member fixed to the crotch portion of the inner surface of the diaper-shaped sheet, at least the mutual interval of the plurality of elastic yarns in the crotch portion is equal to the plurality of elastic yarns in the leg surrounding portion. It is characterized in that it is narrower than the mutual interval between the yarns.

In the present invention, at least the interval between the plurality of elastic yarns at the crotch is smaller than the interval between the plurality of elastic yarns at the leg circumference, so that the contraction force at the crotch is reduced at the leg circumference. Weaker than. Therefore, in the disposable diaper of the present invention, contraction in the width direction of the absorber fixed to the crotch portion of the diaper-shaped sheet is suppressed. In addition, because the leg circumference touches the adherent's thigh with a wider surface in the width direction,
It has good fit on the front and rear sides of the thigh root, hardly leaves any trace of tightening, and is also excellent in preventing side leakage.

[0010] In the present invention, it is preferable that at least the interval between the plurality of elastic yarns in the crotch portion is 2 mm or less.

Furthermore, it is more preferable that at least the plurality of elastic yarns in the crotch portion are fixed to the diaper-shaped sheet in a bundled state (see an experimental example described later). In the present invention, when the plurality of elastic yarns are fixed to the diaper-shaped sheet in a state of being bundled also at the waist side, the contraction force at the waist side is also weaker than that at the leg circumference, so that Tightening marks are less likely to be left on the waist.

[0012]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows a developed state of a pants-type paper diaper P according to the present invention, FIG. 2 shows a front view of the pants-type paper diaper P, and FIG. That is, the disposable diaper P of the present example includes the diaper-shaped sheet 1 and the absorber 10 which is entirely fixed to the inner surface of the diaper-shaped sheet 1 and extends in the front-rear direction with the crotch portion 4 as a center.

The diaper-shaped sheet 1 is formed by laminating and fixing a plurality of nonwoven fabrics, between which a left waist side portion 2L of the front body, a left leg circumference 3L of the front body, a crotch portion 4, and a right side of the front body. A plurality of elastic yarns G1 are fixed so as to be continuous to the right waist side 2R of the front body through the leg circumference 3R, and from the left waist side 5L of the back body to the left leg circumference 6L of the back body, Via the crotch part 4, the right leg surrounding part 6R of the back body and the right waist side part 5 of the back body
A plurality of elastic yarns G2 are fixed so as to continue to R. As shown in FIGS. 2 and 3, the plurality of elastic yarns G1... G2 form leg gathers 7, 7 at the left leg surrounding portion and the right leg surrounding portion, respectively. C indicates a central area around each leg.

The absorber 10 is the same as the conventional one. Although not shown, a liquid-permeable top sheet 11 made of non-woven fabric or the like and directly touching the wearer's skin, and a plastic film such as polyethylene or a water-repellent treatment are applied. An absorbent 12 mainly composed of cotton-like pulp and optionally wrapped with absorbent paper is sandwiched between a liquid-impervious back sheet 13 made of a nonwoven fabric or the like, and the peripheral portion is bonded with, for example, a hot melt adhesive. Can be formed.

Particularly, in the disposable diaper 1 of the present embodiment, the plurality of elastic yarns G1 on the front body side are connected to the left waist side part 2 of the front body.
L, the crotch part 4 and the right waist side part 2R of the front body are fixed to the diaper-shaped sheet 1 in a bundled state, and the other parts, ie, the left leg surrounding part 3L of the front body and the right leg surrounding part 3R of the front body. The diaper-shaped sheets 1 are fixed to each other with an interval therebetween. Also, a plurality of elastic yarns G2 on the back body side
Are fixed to the diaper-shaped sheet 1 in a bundled state at the left waist side part 5L, the crotch part 4 and the right waist side part 5R of the back body, and the other part, that is, the left leg of the back body The peripheral portion 6L and the right leg peripheral portion 6R of the rear body are fixed to the diaper-shaped sheet 1 with an interval therebetween. In the illustrated example, a plurality of elastic yarns G fixed to the front body side are used.
1 and a plurality of elastic yarns G2 fixed to the rear body side are bundled together in the crotch portion 4.

Therefore, in the disposable diaper 1 of this embodiment, the interval between the plurality of elastic yarns G1..., G2.
L, 3R, 6L, 6R are the widest, and crotch 4 and waist 2L, 2R, 5L, 5R are the narrowest.

By arranging the elastic yarns in this manner, the shrinking force of the portions where the plurality of elastic yarns G1... G2 are bundled and fixed, that is, the crotch portion 4 and the waist side portions 2L, 2R, 5L, 5R. Weakens. As a result, the shrinkage of the absorber 3 in the width direction is reduced, and a tightening trace is less likely to be formed on the waist side of the adherend. In this example, the leg circumferences 3L, 3R, 6L, 6
In R, the plurality of elastic yarns G1,..., G2,... Are fixed to the diaper-shaped sheet 1 with an interval therebetween, so that the contraction force of this portion is the crotch portion 4 and the waist side portions 2L, 2R, 5L, 5R. Stronger than. In addition, this leg circumference 3L, 3R, 6L, 6
R touches the thigh of the adherend with a wider surface in the width direction. Therefore, the fitting property to the base of the thigh is good, the trace of tightening is hardly formed, and the side leakage preventing effect is also excellent.

On the other hand, as the elastic yarn of the present invention, a natural rubber yarn or a synthetic rubber yarn having an appropriate thickness and cross-sectional shape can be used. The number of elastic yarns need not be three as in the illustrated example, as long as the number is plural.

In the above example, both the plurality of elastic yarns G1 fixed to the front body and the plurality of elastic yarns G2 fixed to the back body are bundled together in the crotch portion 4. However, the present invention is not limited to this. That is, the plurality of elastic yarns fixed to the front body side and the plurality of elastic yarns fixed to the back body side can be separately bundled at the crotch portion. In this case, as shown in FIG. 4, a plurality of elastic yarns G3... On the front body side and a plurality of elastic yarns G4. The threads G3..., G4... Cross each other, or as shown in FIG. 5, a plurality of elastic threads G5 on the front body side and a plurality of elastic threads G6. Each of the plurality of elastic yarns G5..., G6... May be separated in the front-rear direction without intersecting.

Further, in the above example, the plurality of elastic yarns at the crotch portion and the waist side portion are fixed to the diaper-shaped sheet in a bundled state, and the plurality of elastic yarns around the leg portions are spaced apart to form a diaper-shaped sheet. Although fixed, the invention is not so limited.

That is, in the present invention, it is sufficient that the interval between the plurality of elastic yarns at least in the crotch portion is smaller than that in the leg circumference. Therefore, as long as such a condition is satisfied, for example, a plurality of elastic yarns in all parts may be arranged at intervals. Further, when the interval between the plurality of elastic yarns at both the crotch portion and the waist side portion is smaller than that around the leg, the mutual interval between the plurality of elastic yarns at the crotch portion and the plurality of elastic yarns at the waist side portion are provided. The mutual spacing of the yarns may be different.

<Experimental Examples> Experimental examples will be shown below to clarify the effects of the present invention. First, as shown in FIG. 9A, a sheet piece 200 (an example of the present invention) in which six elastic yarns 200G are bundled and fixed, and a plurality of elastic yarns 2 as shown in FIG.
Sheet piece 2 in which 01G is fixed at intervals of 3 to 5 mm
01 (Comparative Example). Each of these sheet pieces was produced by sandwiching a plurality of elastic yarns between nonwoven fabrics having a basis weight of 20 to 23 g / m ³ and fixing them with a double-sided tape. Is 10
It is 0 mm × 50 mm.

Next, the shrinkage force of these sheet pieces 200 and 201 was measured. Specifically, the sheet piece was attached to a tensile tester and extended and contracted one reciprocation in the longitudinal direction. At that time, the load required for elongation at each elongation rate was measured, and this was defined as the contraction force. Table 1 shows the results.

[0024]

[Table 1]

As is clear from Table 1, the sheet piece 200 of the present invention in which a plurality of elastic yarns are bundled and fixed has a plurality of elastic yarns of the comparative example with an interval of 3 to 5 mm at all elongation rates. The contraction force was weaker than the sheet piece 201 which was opened and fixed. If the interval between the plurality of elastic yarns is 2 mm or less, similarly to the present invention, the plurality of elastic yarns are 3 to 5 mm.
It was also confirmed by an experiment that the contraction force was weaker than that of the comparative example in which the gap was fixed.

[0026]

As described above, according to the present invention, the contraction force of each part of the diaper-shaped sheet caused by the plurality of elastic yarns forming the gather around the leg becomes appropriate. Also, specifically, the following effects (a) to (c) can be obtained. (A) Since the contraction force in the crotch portion in the width direction is weakened, the absorber is less likely to contract in the width direction. Therefore, discomfort given to the adherend can be reduced. (B) The contraction force of the waist side part by the elastic yarn is weakened to the extent that it is difficult to make a tightening trace on the waist of the adherend. (C) Since the interval between the plurality of elastic yarns at the leg circumference of each body is wider than that of the crotch part, it exerts a sufficiently strong tightening force on the thigh of the wearer and at the same time as the thigh of the wearer. It is difficult to leave traces of tightening.

[Brief description of the drawings]

FIG. 1 is a development view of a pants-type paper diaper according to the present invention.

FIG. 2 is a front view of the pants-type paper diaper according to the present invention.

FIG. 3 is a side view thereof.

FIG. 4 is a development view of another pants-type paper diaper according to the present invention.

FIG. 5 is a development view of another pants-type paper diaper according to the present invention.

FIG. 6 is a development view of a conventional pants-type paper diaper.

FIG. 7 is a front view of a conventional pants-type paper diaper.

FIG. 8 is a side view thereof.

FIG. 9 is a plan view of a sheet piece used in an experimental example.

[Explanation of symbols]

P ... Pants type disposable diaper, 1 ... Diaper-shaped sheet, 2
L, 2R: waist side of front body, 3L, 3R: leg circumference of front body, 4: crotch, 5L, 5R: waist side of back body, 6
L, 6R: Legs around the back body, 7: Gather, 10: Absorber, 11 Liquid-permeable topsheet, 12: Absorbent material, 13 Liquid-impermeable backsheet, G1: Elastic thread on front body side, G2 …
Elastic yarn on the back side.

Claims (4)

[Claims] 1. A plurality of elastic yarns extending from the left waist side of the front body to the left waist of the front body, the crotch part, the right leg of the front body, and the right waist side of the front body. While being fixed, a plurality of pieces are arranged so as to be continuous from the left waist part of the back body to the left leg part of the back body, the crotch part, the right leg part of the back body through the right leg part of the back body. An elastic thread is fixed, a diaper-shaped sheet with leg gathers around the right leg and left leg, and a liquid-impermeable back sheet, absorbent and liquid-permeable top sheet in this order. In a disposable diaper comprising an absorbent body fixed to at least the crotch portion of the inner surface of the diaper-shaped sheet, at least the mutual interval of the plurality of elastic yarns in the crotch portion is the same as that of the leg circumference portion. Narrower than the spacing between multiple elastic yarns Diapers, characterized by being. 2. The disposable diaper according to claim 1, wherein an interval between the plurality of elastic yarns at least in the crotch portion is 2 mm or less. 3. The disposable diaper according to claim 1, wherein at least the plurality of elastic yarns in the crotch portion are fixed to the diaper-shaped sheet in a bundled state. 4. The disposable diaper according to claim 3, wherein the plurality of elastic yarns are fixed to the diaper-shaped sheet in a state of being bundled also at the waist side portions.