JPH09192169A - Disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure the erection of side barrier cuffs. SOLUTION: This disposable diaper is provided with a semi-rigid absorbent 3 whose surface side indicates liquid transmissivity, barrier cuffs 6 provided at least in the middle of a longitudinal direction on both sides of a product and a back sheet 20 put on a back surface side on a side opposite to the surface from the absorbent 3. Then, only the intermediate part in a width direction of the back surface of the absorbent 3 is mutually integrated with the back sheet 20 at the center part in the longitudinal direction of the product and both side parts are turned to free parts. One end 61a of the base part of the barrier cuffs 6 is fixed to the side part of the absorbent 3 and the other end 62a is fixed on the outer side in the width direction from the side part of the back sheet 20. Erection on a surface side in a chevron shape is performed with both fixed parts as start lines and an erected state is maintained by an elastic expansion member 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disposable diaper having barrier cuffs, and particularly preferably a pants-type disposable disposable diaper such as so-called training pants.

[0002]

2. Description of the Prior Art Disposable disposable diapers, especially training pants, are used to promote separation of disposable diapers during the transition from an infant to an infant.

Various proposals have been made and some of these pants-type disposable diapers are commercially available. Typical examples thereof are JP-A-2-4326 and JP-A-4-4326.
Nos. 226658 and 4-49920 can be mentioned.

On the other hand, conventionally, disposable diapers having so-called barrier cuffs are commercially available.

This type of paper diaper is excellent in that side leakage of loose stool can be prevented. Therefore, the present applicant has proposed a pants-type disposable diaper having barrier cuffs as JP-A-7-328067. In this paper diaper, since the back sheet has elastic stretchability, the wearer does not feel excessive pressure and is excellent in fit.

[0006]

However, it is important in function of the barrier cuffs that it properly stands up when worn and adheres well to the base of the wearer's leg. The problem is not fully solved.

By the way, the barrier cuffs in the paper diaper disclosed in Japanese Patent Laid-Open No. 7-328067 are obtained by fixing an elastic stretchable member to the rising end of a single sheet.

[0008] Therefore, a main object of the present invention is to obtain a structure which surely raises the barrier cuffs.

[0009]

According to the present invention, which has solved the above-mentioned problems, there is provided a semi-rigid absorber having a liquid-permeable surface, and barrier cuffs provided on at least longitudinally intermediate sides of the product, A back sheet provided on the back side opposite to the front side from the absorber, and at least one of the back side or the back sheet of the absorber is liquid impermeable, and at least the central portion in the longitudinal direction of the product. In, only the widthwise intermediate portion of the back surface of the absorbent body is mutually integrated with the back sheet, and both side portions are free portions, and one end of the hem portion of the barrier cuff is fixed to the side portion of the absorbent body. The other end is fixed outward in the width direction from the side portion of the back sheet, and the both ends of the back sheet are erected on the front side in a chevron shape, and the chevron is formed on the back sheet at the top portion. The resilient and elastic members extending in the integrated longitudinally standing state is maintained, a disposable paper diaper, characterized in that.

Here, it is proposed that the back sheet is made of a material exhibiting elastic stretchability at least in the width direction and at least between the both hem ends.

A structure is also proposed in which the back surface of the absorber is a liquid-impermeable sheet and the back sheet is a liquid-permeable sheet.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail by explaining embodiments with reference to the drawings.

FIGS. 1 to 4 show a typical example of the disposable paper diaper of the present invention. A liquid-permeable top sheet 1 made of a non-woven fabric and a liquid-impervious back sheet 2 made of a polyethylene sheet and the like are cotton-like. The absorbent body 10 having a structure in which the absorbent body 3 made of pulp or the like is wrapped around the main body backsheet 20.
It is provided in. As is well known, the absorbent body 10 includes a high-molecular-weight absorbent polymer, tissue paper wrapping the absorbent body 3, and the like, and as a whole exhibits semi-rigidity that does not change in size but is deformable.

The absorber 10 in the embodiment has a substantially rectangular shape. A main body backsheet 20 that is elastically stretchable in at least the width direction, and in the width direction and the longitudinal direction in the embodiment, is separately provided to the absorbent body 10. The main body staple sheet 20 has an outer shape larger than the absorber 10 to form a flap portion and has an hourglass shape as a whole, and the sub-backsheets 20B and 20B are attached to both sides of the backsheet main body 20A. . Only the backsheet main body 20A exists between the sub backsheets 20B and 20B.

On the product center line side of the sub backsheets 20B, 20B, one or a plurality of leg elastic elastic members 4 made of rubber thread or the like are fixed in an extended state between the sub backsheets 20B and 20B and the backsheet main body 20A. There is.

On both sides of the product, side barrier cuffs 6,
6 and front and rear barrier cuffs 7 are provided. These barrier cuffs 6 and 7 are preferably made of a liquid-impermeable or water-repellent sheet.

The side barrier cuff 6 has a chevron-shaped cross section in a used state, at least in a portion around the leg. In the embodiment, the side barrier cuff 6 has a double sheet structure that is folded back at the top, and one end 61a of the hem portion of the inner sheet portion 61 of the side barrier cuff 6 has the absorbent body 10.
The other end 6 of the hem portion of the outer seat portion 62 fixed to the side portion of the
2a is fixed outward in the width direction from the side portion of the absorber 10 of the main body backsheet 20, and stands up on the front side in a chevron shape with these fixing portions as the starting lines.

At the folding top of the inner sheet portion 61 and the outer sheet portion 62, at least one of them, in the embodiment, both of them, is provided with an elastic elastic member 8 which extends in the longitudinal direction and is integrated under extension. There is. As a result, the standing state of the side barrier cuff 6 is maintained.

On the other hand, as shown in the drawing, the elastic expansion / contraction members 4, 4, 4 in the embodiment are located between the one ends 61a, 62a in the width direction.

The front and rear barrier cuffs 7 (one of the barrier cuffs is not shown) are made of an elastic stretchable sheet band 7A made of urethane rubber or the like and stretchable nonwoven fabric bands 7B and 7C integrated on both sides thereof. The front and rear end portions of the front and rear barrier cuffs 7 are fixed at the portions covering the front and rear flap portions of the main body backsheet 20 and the side barrier cuffs 6, 6. However, between the side barrier cuffs 6 and 6, it is not fixed to the topsheet 1, and when this non-fixed part tends to be separated from the topsheet 1 or to stand up, it propagates through the topsheet 1 and diffuses back and forth. The urine is not guided to the front and rear ends. The presence of the elastic stretchable sheet bands 7A of the front and rear barrier cuffs 7 constitutes the front and rear waist bands.

The main body backsheet 20 is a continuous sheet that defines the entire shape of the entire outer surface of the final product, and is made of a material exhibiting elastic stretchability in the front-rear direction, the width direction, and at least the width direction. Is 150% or more.

In the manufacturing process of the product, for example, the main body backsheet 2 in a state where the absorber 10 is assembled in advance.
It is joined to 0 by a hot melt adhesive or the like. This joint is shown by cross-hatching in FIGS. 2, 4 and 5. That is, the absorbent body 10 is substantially continuously joined to the main body backsheet 20 along the front and rear ends thereof and the middle portion in the width direction. Since the purpose of the present invention is to satisfactorily raise the side barrier cuffs 7, 7 to reliably prevent lateral leakage around the legs, the joint in the middle in the width direction is at least longitudinally equivalent to the legs. It may be joined only in the central portion. The joint may be continuous or intermittent.

Simultaneously or thereafter, the side barrier cuffs 7, 7 are provided with the absorbent body 10 and the main body backsheet 2 via the one end 61a and the other end 62a.
0, for example, by a hot melt adhesive or the like. This joining portion is also shown by cross hatching in FIGS. 2 and 4.

Thereafter, as shown in FIG. 6, the main body backsheet 20 is folded back and forth in the front-rear direction to form side portions 20.
The X and 20X parts are joined together by heat welding or hot melt adhesive to assemble a pants-type disposable diaper. Reference numeral 30 is a tri-fold adhesive tape for fixing the diaper when it is rolled up and discarded.

The most important characteristic of the disposable diaper is the fit property. However, an absorber is required because high absorbency of urine is also required. Since this absorber exhibits semi-rigidity, it acts to retain its shape.

However, in the paper diaper according to the example, the main body backsheet 20 exhibits elastic elasticity. Therefore, when the diaper is worn, the entire body backsheet 20 is tightened against the wearer, and even if the wearer is actively moving along with this, the absorber 1
0 will always fit without leaving the skin.

Now, the present invention has a structure typically shown in FIG. The shape of the worn state is shown in FIG.
From these comparisons, in the unfolded state before use, the side barrier cuffs 7 tended to lie on the side of the topsheet 1, whereas when worn, they were applied to the crotch area and both sides of the disposable diaper contracted, and the crotch area was reduced. FIG. 4 as a cross section in the section
When the absorbent body 10 and the main body backsheet 10 are deformed so that both sides of FIG. 5 are bent upward, the side barrier cuffs 6, 6 are relatively moved, as indicated by broken lines in FIG. Since a contracting force acts on the elastic expansion / contraction members 8 in the longitudinal direction, a mountain shape is erected.

Further, the body backsheet 20 extends not only in the front-back direction but also in the width direction as shown by the white arrow in FIG. 5 when worn, so that as shown by the solid line in the left part of FIG. When the outer sheet 62 expands outward with respect to the inner sheet 61, the side barrier cuffs 6 stand up further than the state of the broken line.

By this standing, side leakage such as loose stool between the side barrier cuffs 6 is surely prevented. If the side barrier cuffs 6 and 6 tend to fall asleep, there is a high possibility of lateral leakage from the top ridge of the side barrier cuffs 6 and 6 between the wearer's skin (especially for a wearer with a lot of movement). .

The above-described operation and advantage of the present invention is that the side barrier cuffs 6 and 6 are double sheets, and the absorber 3 is not fixed to the main body backsheet 20 by its whole surface but integrated. Only the widthwise middle portion of the back surface of the body 3 is mutually integrated with the main body backsheet 20, and both side portions are free portions, and one end of the hem of the side barrier cuff 6 absorbs. The structure is fixed to the side part of the body 3, and the other end is fixed to the outside in the width direction from the side part of the main body backsheet 20, and the both side fixing parts serve as ridges to stand up in a mountain shape on the surface side. This is because

When the main body backsheet 20 having elastic elasticity is positively used, if the main body backsheet 20 and the absorber 10 are fixed on the entire surface, the main body backsheet 20 absorbs due to the non-extendability of the absorber 10. Only the portion extending outward beyond the body 10 extends, and sufficient elastic stretchability cannot be obtained as a whole. However, by adopting the above-mentioned structure, the main body backsheet 20 can be stretched almost entirely, so that a high fitting property is secured.

In this case, although it is particularly preferable that the main body backsheet 20 exhibits elastic stretchability at least in the width direction in order to bring about the above-mentioned effect, the main body backsheet 20 is preferable.
Side barrier cuffs 6 even if they show non-stretchability
The high standing effect of is brought about. That is, when the paper diaper is attached, it is not completely curved in the widthwise direction, but is curved with some wrinkles. On the other hand, the main body backsheet 20 is maintained in a stretched state without being substantially wrinkled even when mounted, so that the one end 61a and the other end 62a tend to be separated from each other. Side barrier cuffs 6
This will ensure that the standing of

(Others) From the standpoint of preventing stuffiness, the main body backsheet 20 is desired to have at least one of breathability and waterproofness (water repellency), and more preferably both of them. The material can be appropriately selected, but as an example, a rayon spunlace non-woven fabric in which polypropylene-based heat-sealing fibers and rayon fibers are mixed, and a melt-blown non-woven fabric mainly composed of urethane or isoprene rubber-based material are heat-sealed, An example is one in which the former non-woven fabric is used on the skin side of the wearer by integrating them by ultrasonic bonding, bonding with a hot melt adhesive, or the like.

Although the back sheet 2 of the absorbent body 10 is not liquid-permeable in the embodiments, it may be liquid-permeable as long as the main body back sheet 20 is liquid-impermeable. That is,
At least one of the back sheet 2 and the main body back sheet 20 may be liquid impermeable.

The side barrier cuff 6 is a folded double sheet as a whole, but the top may be a single sheet as shown in FIG. The number of elastic expansion / contraction members 8 and the like are appropriate. Further, as shown in FIG. 8, the hem of the outer sheet 62 may be folded inward to form the other fixed end 62a.

[0036]

As described above, according to the present invention, the side barrier cuffs can be reliably erected, and thus,
Side leakage such as loose stool can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a disposable diaper of the present invention before final assembly.

FIG. 2 is a perspective view of an essential part showing the assembly relationship.

FIG. 3 is an enlarged perspective view of a main part thereof.

FIG. 4 is a cross-sectional view.

FIG. 5 is an explanatory cross-sectional view showing standing of barrier cuffs.

FIG. 6 is a perspective view of a final disposable diaper in an assembled state.

FIG. 7 is a cross-sectional view showing a modified example.

FIG. 8 is a cross-sectional view showing still another modified example.

[Explanation of symbols]

1 ... Liquid-permeable front sheet, 2 ... Liquid-impermeable back sheet, 3
... Absorber main body, 4 ... Elastic elastic member, 6 ... Side barrier cuffs, 7 ... Front and rear barrier cuffs, 8 ... Elastic elastic member,
10 ... Absorber, 20 ... Main body backsheet.

Claims (3)

[Claims] 1. A semi-rigid absorbent body whose surface is liquid permeable, barrier cuffs provided at least in the longitudinal middle of both sides of the product, and a back surface on the opposite side of the absorbent body from the surface. And a back sheet provided, wherein at least one of the back surface of the absorber and the back sheet is liquid impermeable, and at least in the longitudinal center portion of the product, only the widthwise intermediate portion of the back surface of the absorber. Is mutually integrated with the back sheet, and both side portions are free portions, one end of the hem portion of the barrier cuff is fixed to a side portion of the absorbent body, and the other end is more than the side portion of the back sheet. An elastic elastic member that is fixed outward in the width direction and that rises on the surface side in a chevron with these fixing parts as a starting line and that is integrated with the back sheet at the crest of the chevron and extends in the longitudinal direction. The disposable diaper is characterized in that the standing state is maintained by. 2. The disposable diaper according to claim 1, wherein the back sheet is made of a material having elastic elasticity at least in the width direction and at least between the both hem ends. 3. The back surface of the absorber is made of a liquid impermeable sheet, and the back sheet is made of a liquid permeable sheet.
Or the disposable paper diaper according to 2.