JPS5887301A - Disposable diaper - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disposable diaper that is used once and then thrown away.

Disposable diapers have become widely used these days due to their convenience. One of the major deficiencies with conventional disposable diapers is that during use, the diaper and the user's legs do not close together. This problem can be overcome to a large extent by using a diaper cover because the diaper is flexible, but this problem can be overcome to a large extent, however, for now. Disposable diapers are mainly made of paper, and they do not have attenuated flexibility, especially when they absorb water and get wet.Diaper covers are reusable, so it is best to use reusable covers with disposable diapers. This contradicts the purpose of disposable diapers, which are to be discarded after one use.

Therefore, in order to prevent this leakage from the armpits, it has been considered to use a diaper with a geometrical shape. This is a so-called two-fold type, but compared to a flat type, it also has a better fit and larger absorption capacity, so it is not satisfactory in terms of leakage from the armpits. Ta.

Next, a diaper with elastic members inserted into the legs and gears on both sides has been considered.90 This fits the user's legs perfectly, and there will be no gaps during use. do not have. However, the elastic member protrudes from the legs and is too rounded.

I feel stuffy and my legs get irritated and turn red. The width of the central part of the absorbent layer is narrowed to make it thinner. >, the absorbency of this important area of the diaper decreases. Ota,
Due to the nature of disposable diapers, they must be cheap,
The reason for the inclusion of this elastic member was that the elastic member was made in a continuous manner, resulting in a decrease in child performance.

The manufacturing equipment tII is complicated and becomes uneconomical and expensive.

The next idea, item 90, is to put water-absorbing and shrinkable threads that shrink when wet on both sides of the diaper, and cut the edges of both sides to fit between the user's legs. Unlike elastic members, this does not tighten the user's legs in the first place, but contracts during urination or water absorption, preventing armpit leakage, and is less irritating to the user's legs. However, because the water-absorbing contraction thread gradually contracts, this method is only effective when the first urine volume is 50 to 40 cc, and 400 cc.
In the above cases, IIC was found to leak from the armpits, albeit in a small amount.

Therefore, the inventors continued their research and found that there was almost no leakage from the armpits, and it was comfortable for the user.
We discovered an economical disposable diaper and completed the present invention.

That is, the present invention provides a fluid-permeable dog sheet, a fluid-impermeable backsheet, and an absorbent sheet inserted between the two sheets, and a moisture-absorbing material along the outside of both longitudinal edges of the absorbent layer. t) In a diaper equipped with a water-absorbent shrinkable thread that shrinks more than 1a, the two edges in the longitudinal direction of the diaper are rolled back on the outside of the water-absorbent shrinkable thread, and the top sheet on the underside of the nine folded edges is 4111 This invention provides a disposable diaper in which an adhesive portion is provided by adhering the opposing top sheet to the inner side of the absorbent layer from the side edge. 1 is a partially cutaway plan view showing an example of a disposable diaper according to the present invention, and FIG. 2 is a sectional view taken along the Moum line. This diaper 10 has a top sheet of 11% and an M absorption layer of 15.
0@Storage layer 1s consisting of moisture-resistant red water paper 12, water-absorbing shrinkable thread 14, and puncture sheet 15 is stacked on backsheet 15, and glued onto backsheet 15 by adhesive #41 applied to backsheet 15. Fixed.

Moisture-resistant water-absorbing paper 12 is layered on top of absorbent layer 15 . Generally, the top sheet 11 is longer than the absorbent layer 13 and the moisture-resistant water-absorbing paper 12, and is made to have the same dimensions as the back sheet 15.
It is fixed to the moisture-resistant and water-absorbing paper 12 using a number of adhesives @42,
Furthermore, the water shrinkage yarn 14 is fixed to the back sheet 15 by the exposed portions at both ends of the adhesive line 41.
The side edges of the back sheet 15 are fixed to the back sheet 15 with an adhesive at both ends.

16b, facing top sheets 17a, 1
7b and create spaces 18 on both sides of the diaper. The adhesive part may be fixed only at the center of the barrel as shown in Fig. 1, or it may be fixed over the entire length of the barrel except for both ends.Furthermore, as shown in Fig. 3, incisions 51 are made in both side edges. m
.

31b, 52a, and 52'b may be inserted and fixed with K and return adhesives 54a and 54b, similar to the flaps 53a and 55bli formed by squeezing. The reason why we do not glue all the way to both ends is because if we glue them, we will not be able to adjust the waistband, and the sides will be stiff, making it difficult to wear. It may be provided over the entire length, or it may be short by saving the ends.

Although FIG. 1 shows an example of the absorption layer 11tfs in a clam-like shape, modifications are also possible. Various types of liquid-permeable nonwoven fabrics are used as the top sheet 11 used in the IJQ of this invention. A nonwoven fabric made of rayon, polypropylene, polyethylene, or polyester fat as a main component and made of single or mixed cotton is used. ○The absorbent layer 13 may include cotton-like bulbs, water-absorbing paper,
Rayon cotton and highly absorbent polymeric absorbent materials are available, and these can be used in a single layer or in a mixed layer.

What is the water-absorbing contraction thread 14? Those that have a shrinkage of 1011 or more, such as modified cellulose fibers such as brocade and rayon, sodium acrylate, acrylic acid, acrylonitrile, acrylic 7i finely grafted cellulose, and crosslinks thereof. Examples of the zero pack sheet 15 include yarns made from the above-mentioned modified products such as wool and silk, and modified synthetic fibers, and twisted yarns thereof. A soft film such as It is also possible to mix some titanium oxide with it to make it milky white and modify the texture by embossing it. It is absorbed from the top sheet and transported to the absorbent layer. It is preferable to use a non-woven fabric using hydrophobic fibers as the top sheet to prevent backflow, since it is spot-absorbent and leakage does not spread to the surrounding area other than from the outside. When the liquid reaches the absorbent paper, it is diffused along the paper and is simultaneously absorbed by the pulp in the absorbing layer over a wide area.Furthermore, if a super absorbent polymer is contained in the absorbent layer, the liquid will be The liquid is absorbed into the polymer in the absorbent layer and is sealed in the polymer and does not come off even under pressure. Once transferred, the water-absorbing shrink threads begin to contract and the legs of the diaper fit around the user's legs, preventing leakage from the armpits. However, as mentioned above, the water-absorbing shrinkable thread gradually shrinks, so if the first amount is 40 cc or more, the water-absorbing shrinkable thread can be used. If it's a flat 11, there will be a small amount of armpit leakage. So, first of all, suddenly #? It is necessary to sufficiently wet the water-absorbing shrinkable thread with the discharged liquid and create a leak-free structure: b.

In the present invention, efficiency is improved by providing a space to temporarily hold the liquid in order to moisten the water-absorbing shrinkable thread. Here, it is advisable to provide a space by fixing the absorbent layer at a distance of 5W or more and 20cm or less from the side edge of the absorbent layer. This is because when the distance becomes less than or equal to S, this spatial effect occurs and K(<p,
If it exceeds 20cm, the surface that touches the user's skin will become narrower.This space temporarily retains the liquid, and the liquid causes the water-absorbing contraction thread to start shrinking. At the same time, * is absorbed into the internal absorption layer. The absorption capacity of the diaper at this time is 1 (9) urine volume 30 ~ 1 lQc
c [It's something that resonates] Even if the user continues to wear this °-shaped part, it will not cause armpit leakage even when urinating 2 to 5 times.

Furthermore, the diaper having such a structure according to the present invention, unlike the hourglass type diaper K using an elastic member, has no cuts on both side edges, making it easy to manufacture and easy to clean. Otojiku4nono, Jj! ! It is economical and does not require collection. Also, unlike elastic members, it does not have to be manufactured in bulk, making it suitable for high-speed production.

The present invention will be further explained in detail by showing Examples and Comparative Examples below.

In addition, in the following Examples 1 and 2 and Comparison Example 1, the materials used were as follows.

Top sheet: Polyester@@50%, EEI (
Chisso Co., Ltd.) Non-woven fabric S-resistant water-absorbing paper with a basis weight of 20 f/ff1', which is made by mixing 50 filtrate and bonding the edge fibers together by heat: A water-absorbing paper with a basis weight of 20 f/d. A turtle whose wet strength was improved using sponge sponge.

Education #: Pulp water-absorbing shrink yarn made by crushing Kuehakuza RAM: 20 count carboxymethylated yarn, 6 yarns twisted together (No. 4 treated with surfactant as process oil) Puff P sheet lk-density polyethylene film that is generally commercially available for disposable diapers Example 1 Disposable diapers having the structure shown in the 1st WJK were manufactured for 40 babies aged 5 months to 18 years (7 to 8 diapers/diaper).
The system was made to be used by people (half male and half) to use it at night. The leakage rate at that time,
The side leakage rate was measured.

The results are shown in lll-1.

111/IIA Example 2 A pair of disposable diapers having the configuration shown in FIG.

Comparative Example 1 As shown in FIG. 4, a pair of disposable diapers were manufactured in which water-absorbing and shrinkable threads A4 were placed on the sides and both edges were cut to fit the armpits. The leakage rate was measured in the same manner as in 1. Check out the results! Show IK.

Comparative Example 2 The stuttering rate of commercially available two-fold disposable diapers was measured in the same manner as in Example 1. 1i result! Show IK.

Comparative Example 5 The folding rate was measured in the same manner as in Example 1 for a disposable diaper K in which a commercially available elastic member was installed on the side. The results are shown in Table 1.

Table-1

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway plan view of an embodiment of the disposable diaper of the present invention, Fig. 2 is a cross-sectional view of the diaper in Moom IIIK, and Fig. 3 is a partially cutaway plan view of an embodiment of the disposable diaper of the present invention. A4I! FIG. 4 is a plan view of another example of the disposable diaper, and FIG. 4 is a plan view of the disposable diaper used in Comparative Example 1. 10...Disposable diaper 11...Top sheet 12...Al resistant @water paper 15...Absorbent layer 14...Water-absorbing shrink yarn 15... ... Backsheets 14a, 16b ... Adhesive Applicant's Agent Ko, Tani Gei Figure 1 1n Figure 3 Figure 2

Claims (1)

[Claims] A fluid-permeable top sheet, a fluid-impermeable back sheet, and an absorbent layer inserted between these two sheets, and a moisture absorbent layer 11 along the outside 111 of both longitudinal edges of the absorbent layer. - In a nine-diaper with a water-absorbing shrinkable thread that shrinks as much as A disposable diaper characterized in that an adhesive portion is provided by adhering the opposing top sheet to the inside from the side edge of the absorbent layer.