MXPA97000663A - Diap - Google Patents

Abstract

The present invention relates to a back layer of a disposable diaper consisting of a plastic film that udders an entire outer side of the diaper and a pair of non-woven fabrics sheets to an outer surface of the plastic film on the front and rear region from the waist but separated longitudinally one from the other on the region of the crotch

Description

PflekflL DESECHflBLE IMOORE DESCRIPTIVE The present invention relates generally to a disposable diaper for the absorption and retention of urine and other body excretions. It is well known that a liquid-impermeable plastic film, such as a polyethylene film, is used as a liquid-impermeable backing of a disposable diaper. It is also known, for example, from Japanese Patent Application No. He? 3-8615 < 3 that a rnixta layer composed of an elastic film and a non-woven fabric laminated to an outer surface of the plastic film used as a back layer * is used. A diaper that uses a plastic film as a back layer is generally unpleasant to users because of the peculiar uncomfortable feeling of the plastic film. The use of a composite layer of such a nonwoven film and fabric that covers an outer surface of the film, as described in the aforementioned application, certainly eliminates the peculiar problem of a plastic film by providing an exterior surface of the film. diaper with a feeling similar to that of the fabric. However, the back layer made of such a rnixta layer necessarily has a higher stiffness than that of the back layer made of a plastic film only and the separations of the folds formed around the waist opening as well as the apertures of the legs, respectively, as elastic members provided around such openings contract and become correspondingly spaced. When the folds formed around the openings of the legs are of a rough separation, in other words, when no folds of a sufficiently fine separation can be obtained around the openings of the legs, the diaper fit around is deteriorated. of the legs of the user, resulting in undesirable draining of bodily excretions around the leg openings. In view of the problems described above, it is a primary object of the invention to provide a disposable diaper prepared so that a soft feel may be provided around the wearer's waist and the diaper fit around the diaper may be improved. the legs of the user. The objective set forth above, according to the invention, is achieved by a disposable diaper having front and rear regions of the waist and a crotch region therebetween, the diaper consisting of a liquid-permeable top layer, a back layer liquid impervious and a central absorbent layer of the liquids disposed therebetween, and the crotch region being provided along the transversely opposite side portions thereof of elastically stretchable members adapted to encircle each leg of the user characterized in that the The back layer consists of a liquid-impervious plastic film and a pair of non-woven fabrics consisting of synthetic fibers oplo-plastic laminated in one piece to an outer surface of the plastic film on the front and rear regions of the waist respectively , but separated from each other on the crotch region. With the diaper of the invention, the outermost surfaces of the front and back regions can offer a pleasant feel similar to that of the fabric, on the one hand, and the crotch region can form inward folds and thereby ensure fit around the legs of the user, on the other Jado. Figure 1 is a plan view showing a disposable diaper of the invention as it is partially divided. The diaper 1 shown in figure 1 is a plan view as it is partially divided consists of a liquid-permeable upper layer 2 intended to make contact with the skin of the user, a liquid-impermeable back layer 3 intended not to make contact with the skin and a central layer 4 absorbent of the liquids disposed between them. The diaper 1 has a front region 6 of the waist, a rear region 7 of the waist and a region 8 of the crotch extending between them. The upper layer 2 and the rear layer 3 are joined along the portions thereof which extend outwardly beyond the peripheral edge of the central layer 4 to define the longitudinal end portions 10, 11 of the front and rear regions 6, 7 of the waist, portions 12 and 13 of the transversely opposite side edges of the front and rear regions 5, 7 of the waist, and the portions 14 of the transversely opposite side edges of the region 8 of the crotch Ja, respectively, the bas portions 14 of the side edges of the crotch region 8 are curved inwardly of the diaper 1 so that they fit around the wearer's legs. The longitudinal end portions 10, 11 of the front and rear regions 6, 7 of the waist and the portions 14 of the side edges of the crotch region 8 of elastic members 17 for opening the waist and limbs are provided. J8 stitches for the leg openings, respectively. These elastic members 17, 18 are disposed between the upper layer 2 and the rear layer 3 and secured to any of these layers 2, 3 under elastically stretchable conditions thereof. A pair of fastening tapes 19 adapted to be detachably attached to the portions 12 of the side edges of the front region 6 of the waist extend laterally from the portions 13 of the lateral edges of the region. 7 rear of the waist, respectively. The upper layer 2 can be non-woven fabric permeable to liquids of ther oplastic fibers or perforated plastic film permeable to liquids. The back layer 3 comprises a plastic film 21 impervious to liquids or air permeable but impermeable to liquids covering the entire outer side of the diaper 1, a non-woven fabric 22 of thermoplastic fibers substantially identical to the front region 6 of the waist both in shape and in size thereof and laminated in one piece to the plastic film 21 on the front region 6 of the waist and a non-woven fabric 23 of terrnoplastic fibers substantially identical to the rear region 7 of the Waist either in co-form or in isma size and laminated in one piece to the plastic film 21 on the rear region 7 of the waist. Woven fabrics 22, 23 are well known in the art, but preferably meltblown or bound and spunbond in which no chemically bonded material is used. From the back layer 3 for the diaper 1, the front and rear regions 6, 7 of the waist taken to be frequently touched by the hands of the user and of the mother have the outermost surface provided with the non-woven fabrics 22, 23 which They offer a soft and pleasant feeling similar to that of the fabric. The crotch region 8 is seldom touched by the user and the mother is constituted by the plastic film 21 only and the absence of the non-woven fabrics 22, 23 correspondingly reduces the stiffness of the back layer 3 in the region 8 of the crotch compared to the back layer in the front and rear regions 6, 7 of the waist. Consequently, relatively thin folds can be formed along the portions 14 of the transversely opposite side edges of the crotch region 8 as the elastic members 18 contract, and such thin folds ensure the fit of the diaper 1 around the legs. of the user. With the diaper l in its developed state, the non-woven fabrics 22, 23 are longitudinally spaced apart from each other and preferably on a scale of 100-500 mm which can be appropriately increased in the case of an adult diaper. The lamination of the non-woven fabrics 22, 23 can be carried out to the plastic film 21 by means of an adhesive substance such as an adhesive substance of the hot-melt type or by thermal bonding as it is done for bonding or joint of the other coents of the diaper 1. Runque not shown, the non-woven fabrics 22, 23 may be different from one another in their shapes as well as in their sizes.

Claims (3)

NOVELTY OF THE INVENTION CLAIMS

1. - A disposable diaper having front and rear waist regions, a crotch region therebetween, the diaper consisting of a liquid-permeable top layer, a liquid-impermeable back layer and a central liquid-absorbing layer arranged therebetween, and the crotch region being provided along the transversely opposite lateral edge portions of elastically stretchable members, intended to encircle each leg of the wearer, consisting thereon of the back layer of a waterproof plastic film to liquids and a pair of non-woven fabrics consisting of synthetic oplo-ther synthetic fibers laminated in one piece to an outer surface of the plastic film on the front and rear waist regions respectively, but separated from one another over the region of the crotch.

2. A disposable diaper according to claim 1, further characterized in that the non-woven fabrics are longitudinally spaced from each other on a scale of at least 100 m.

3. A disposable diaper according to claim 1, further cited because the plastic film is permeable to air but impermeable to liquids.