JP2874918B2 - Diapers - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a disposable diaper having improved excretion prevention and fit.

[Conventional technology]

As is well known, diapers for use are made of fluff pulp mat, water-absorbing paper, or highly water-absorbing polymer between a liquid-impermeable back sheet made of polyethylene or the like and a liquid-permeable top sheet made of non-woven fabric such as polyester. The elastic body is provided on the waist and the crotch part. Further, a fastener tape for connecting the back side and the front side is provided at the waist end of the back side.

In the conventional disposable diaper, the crotch gather has an elastic body between the top sheet and the back sheet along both edges of the absorber. In such a diaper, it is difficult to prevent the excrement floating on the topsheet, such as urine or loose stool containing a large amount of water, transmitted on the topsheet from leaking at the stretchable elastic portion of the crotch, so that the wearer's clothes cannot be removed. There was a risk of getting dirty.

On the other hand, as the gathers installed on the crotch, not only the stretchable elastic body installed between the top sheet and the back sheet, but also a nonwoven fabric to which the stretchable elastic body is attached is installed in parallel with the absorber side edge and the crotch gathers. Japanese Patent Application Laid-Open Nos. 61-296103, 62-25021, 63-15950
1) According to this method, it is easy to prevent the excrement floating on the topsheet from leaking. However, in the manufacturing process, since the elastic elastic body is divided into two parts and attached to the diaper main body, the work process is difficult. There is a problem that it is difficult to improve the efficiency.

(Problems to be solved by the present invention) As described above, in a diaper in which a stretchable elastic body is installed only between the conventional top sheet and back sheet, floating excretion on the top sheet leaks to the outside of the diaper. In addition to conventional crotch gathers, diapers that are installed with a non-woven fabric attached with a stretchable elastic body in parallel with the side edges of the absorber, etc., can remove excrement floating on the topsheet. It is possible to prevent leakage, but in the diaper manufacturing process,
There is a problem that it is difficult to improve the production efficiency because the attaching step of the elastic elastic body is divided into two steps.

(Means for Solving the Problems) According to the present invention, an absorber is disposed between a liquid-permeable top sheet and a liquid-impermeable back sheet, and the absorber is arranged from both side edges in the longitudinal direction of the absorber. In a disposable diaper having the back sheet extending outward and a side flap including a front side sheet disposed thereon, and a leak-proof portion extending upward from above the side flap, the front side sheet includes: , Formed of a hydrophobic non-woven fabric, the leak-proof portion is formed by the front side sheet disposed on the back sheet, and is located on a tip and a side flap separated upward from the diaper surface. The front end has a base end portion, and the front end portion has a side edge region located inside the diaper of the front side sheet disposed on the back sheet over the entire length of the diaper in the longitudinal direction. The outer side of the diaper is bent and formed by attaching a stretchable elastic body between the bent portions of the sheet, and the base end portion is formed by the front side sheet from the top sheet extending onto the side flap. The upright portion is formed by bonding, and the leak-proof portion is also formed such that both ends in the longitudinal direction of the diaper are folded inward in the diaper at both ends in the longitudinal direction of the diaper and adhere to the topsheet on the absorber. A disposable diaper which is fixed, and further has elastic elastic bodies attached to side flaps inside and outside the base end near the base end, respectively.

That is, according to the present invention, since the upwardly extending leak-proof portion (upper flap portion) is made of a hydrophobic nonwoven fabric, the leak-proof portion has air permeability and is improved in unevenness, and both ends of the leak-proof portion in the longitudinal direction are realized. Since the leak-proof part is tilted inward in the diaper at the part and is adhesively fixed on the surface sheet on the absorber, a pocket is provided between the surface sheet on the absorber and the leak-proof part (upper flap part). A part is formed, and an improvement in leak prevention is realized.

In the disposable diaper of the present invention, a stretchable elastic body is also attached to the vicinity of the base end of the leak-proof part, and acts integrally with the leak-proof part, so that the leak-preventing effect is further improved.

It is more effective in preventing leakage than providing the base of the leak prevention unit on the topsheet on the absorber rather than on the side flaps and forming a pocket on the topsheet on the absorber.

Further, when manufacturing the disposable diaper of the present invention, an adhesive is applied to a portion corresponding to a crotch portion while a hydrophobic nonwoven fabric is moved in a longitudinal direction, and an elastic elastic body is extended to a portion where the adhesive is applied. After the end portion of the non-woven fabric is bent so that the elastic body is on the inside to form a leak-proof portion, the leak-proof portion is attached to both edges of the topsheet slightly wider than the absorber. It is manufactured by bonding the base portion of the base member and bonding the leak-proof portion inward in the back region and the abdominal region to the surface sheet, so that the formation and attachment of the leak-proof portion are relatively easy, and the absorber is used. Since a slightly wider surface sheet is used, the surface sheet for forming the side flap portion can be saved.

Further, in the present invention, the elastic member also extends or contracts in the vicinity of the base end portion of the leak preventing portion over substantially the same length as the elastic member provided at the distal end portion of the leak preventing portion, or over about 2/3 of the length of the elastic member. Because the elastic body is installed, the fit when the diaper is worn is improved, and the elongation rate of the elastic body provided at the tip of the leak-proof part can be reduced, or a relatively thin elastic body can be used. Because it can be used, it does not tighten the skin.

Incidentally, the top sheet, absorber and back sheet used in the present invention can use those used in ordinary disposable diapers, and as the hydrophobic nonwoven fabric, those manufactured using hydrophobic fibers, or A nonwoven fabric subjected to a water-repellent treatment with a water-repellent agent can be used.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings.

FIG. 1 is a developed plan view of a disposable diaper according to the present invention as viewed from a top sheet side. In the present invention, it does not matter how the structure inside the diaper body is, but its basic structure is a liquid-permeable surface center sheet made of a polyester nonwoven fabric and the like, similarly to a commonly used disposable diaper. 1. Surface side sheet 2 provided with elastic elastic material (see FIG. 2), liquid-impermeable back sheet 3 made of polyethylene film or the like (see FIG. 2), and between surface center sheet 1 and back sheet 3 And an absorbent body 4 (see FIG. 2) made of a flap pulp mat, water-absorbing paper, a superabsorbent polymer, or the like. Also,
Polypropylene on the back sheet side of the abdomen on the front side of the diaper,
A reinforcing film 5 made of polyester or the like is adhered, and a fastening tape 6 for connecting the front side and the back side of the diaper is provided on the longitudinal side edge of the back side.

FIG. 2 is a cross-sectional perspective view taken along line XX 'of FIG. The side flap 7 is formed by laminating the front side sheet 2 and the back sheet 3, and the front side sheet is a top sheet (front center sheet) 1 at the side edge of the absorber.
The leak-proof portion 8 is formed by a side edge portion located inside the diaper.

The front side sheet is preferably a hydrophobic non-woven fabric, and a measure of the hydrophobicity of the surface side sheet is preferably 5 cm or more according to the flow length measurement method, so that the effect of preventing leakage is greater.

The flow length measurement method is carried out in a 20 ° C., 65% RH atmosphere as follows.

Measure the nonwoven fabric to be measured 3cm in the flow direction and 10cm in the width direction
Cut to dimensions. Place the nonwoven fabric on a 45 ° slope and
Gently drop one drop (0.04 cc) of pure water at ℃ on the nonwoven fabric and measure the length of the flowing water drop.

As shown in FIG. 2, the leak-proof portion 8 is formed by bending a side edge region which is usually located inside the diaper of the front side sheet 2 so as to form a 2.
Or cut at the bent part and the end is 1
It may be formed heavy or other configurations, but a double structure is preferred because the leakage prevention effect when a load is applied during use becomes large.

The stretchable elastic body 9 provided in the leak-proof portion is not limited by the material or form as long as it is stretchable such as natural thread rubber, urethane film, urethane foam sheet, etc. A urethane foam sheet is optimal in terms of keeping it soft.

A method using a hot melt adhesive is suitable as a method for attaching the elastic elastic body to the leak-proof part (upper flap). In the case of a urethane foam sheet, the elastic body is adhered in a stretched state within a range of 150 to 250%. Is preferred.
If the elasticity is 150% or less, no pocket is formed between the top sheet and the top sheet on the absorbent body, and the baby does not easily hit the thighs, and the leakage prevention effect is reduced. Conversely, if the stretch ratio is high, and if it is 250% or more, when the diaper is worn, it will bite into the baby's skin and become a problem. Each of the other materials also needs to have a degree of expansion and contraction enough to create a pocket, and must be adjusted to a range that is not too strong.

As shown in FIG. 2, elastic elastic members 10 and 10 ′ are disposed on the inside and outside side flaps of the proximal end portion near the proximal end portion of the leak preventing portion 8, respectively. ,
Reference numeral 10 'is intended to improve the fit and the adhesion of the baby to the skin when the diaper is worn together with the elastic body provided at the tip of the leak preventer.

The material of the elastic body 10 and 10 'can be the same material as the elastic body to be installed in the leak-proof part. However, due to the influence of the absorber, the expansion ratio may be larger than that of the elastic member of the leak preventing portion, or an elastic member having high elasticity may be used.

FIG. 3 is a perspective view of a diaper according to the present invention before being worn by a wearer.

The elastic body provided at the tip of the leak-proof part 8 exhibits a leak-proof effect along the crotch of the baby, and the elastic bodies 10 and 10 'provided at the side flaps serve as thighs of the baby. Surrounding the diaper improves the fit of the diaper and further enhances the leakage prevention effect.

Note that, in the example shown in FIG. 2, the case where the leak-proof part is doubled has been described. However, when the base part of the leak-proof part is made single, the front side sheet 2 and the surface sheet 1 or An elastic body 10 or 10 ′ is preferably attached between the back sheet 3 and the elastic sheet 10.

(Effect of the Invention) By providing the diaper of the present invention, it is possible to prevent leakage of excrement floating on the diaper surface sheet, improve fit of the crotch, and attach a stretchable elastic body in the manufacturing process in one step. As a result, production efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is an exploded plan view of the disposable diaper of the present invention viewed from a top sheet side, FIG. 2 is a perspective view of a cross section of the diaper taken along line XX ′ in FIG. 1, and FIG. FIG. 2 is a perspective view of the diaper of the present invention before being worn on the diaper. 1 top sheet (front center sheet), 2 front side sheet, 3 back sheet, 4 absorber, 5
... Reinforcing film, 6 ... Fastener tape, 7 ... Side flap, 8 ... Leakproof part, 9,10,10 '... Elastic elastic body, 11 ... Adhesive part at both ends of leakproof part

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Terada Definition 1-10-6 Shinonome, Koto-ku, Tokyo Oji Paper Co., Ltd. Research Center (56) References JP-A-1-183501 (JP, A) 63-182402 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) A61F 13/15, 13/54

Claims (1)

(57) [Claims] An absorbent body is provided between a liquid-permeable top sheet and a liquid-impermeable back sheet, and said back sheet extends outward from both longitudinal side edges of said absorbent body. In a disposable diaper having a side flap composed of a surface side sheet disposed thereon and a leak-proof portion extending upward from above the side flap, the surface side sheet is formed of a hydrophobic nonwoven fabric. The leak-proof portion is formed by the front side sheet disposed on the back sheet, and has a distal end portion separated upward from the diaper surface and a base end portion located on the side flap. The front end portion has a side edge region located inside the diaper of the front side sheet disposed on the back sheet and is bent outward in the diaper over the entire length of the diaper in the longitudinal direction. The base end is formed by joining a portion where the front side sheet rises from the top sheet extending onto the side flaps, with a stretchable elastic body attached between the bent portions of the sheet. The leak-proof portion is also fixed at both ends in the longitudinal direction of the diaper at the two ends in the longitudinal direction of the diaper in the inward direction of the diaper, and is adhered and fixed on the top sheet on the absorber. A disposable diaper characterized in that elastic elastic bodies are attached to side flaps inside and outside the base end near the end, respectively.