FR2471149A1 - DISPOSABLE LAYER AFTER USE PROVIDED WITH ELASTIC BODIES - Google Patents

Abstract

THIS LAYER INCLUDES AN ABSORBENT BUFFER 26 PRINTED BETWEEN A WATERPROOF SUPPORT SHEET 22 AND A PERMEABLE TOP SHEET 24 AND ELASTIC BANDS 34, 36 ATTACHED TO THE SUPPORT SHEET AT LEAST IN THE CENTRAL PART OF THE TWO SIDE EDGES OF THE LAYER TO FORM ZONES 'INSIDE LEG SEAL, THE ELASTIC STRIPS ARE LOCATED LESS THAN 1.9CM FROM THE PAD, AND ARE STRETCHED SO THAT FOLDINGS ARE ONLY FORMED IN THE CROP SEALING AREAS WHILE IT IS NOT A VERY LOW NUMBER OF CROSS-FOLDING APPEARS IN THE CROSS-LEG REGION WHEN THE LAYER IS USED.

Description

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  The present invention relates to disposable diapers and more particularly to a diaper

fitted with elastic and profiled.

  In the past, proficient layers have already been made

  straps, fitted with elastic bands, such as that described in US Pat. No. 3,860,003, in which bands

  elastic bands are attached to the crotch parts of the

  che and spaced at least 1.9 cm from the absorbent pad to form elastic tight crotch zones intended to be secured around the child's legs to prevent the escape of liquid from inside the diaper, along these legs. Elasticized bands are placed more than 1.9 cm from the absorbent pad to prevent wrinkles from forming across the region

diaper crotch.

  Another layer is currently being manufactured in which elastic bands are placed within

  1.9 cm of absorbent pad to form transverse folds

  salsa in the crotch region of the diaper in order to increase the absorption capacity in this region

  of the diaper. However, it has been found that these folds can

  wind act as a channel, which results in excessive leakage out of the diaper, and that folds formed in the crotch region are uncomfortable for the child's gluteal region when the child is seated,

  especially if the layer is not saturated.

  The object of the present invention is to avoid

  the two types of diapers of the prior art. According to the present invention, in fact, elastic members are placed within 1.9 cm of the absorbent pad, which reduces the width of the zones

  crotch seal, and makes the layer more comfortable

  table. However, the elastic bands are arranged so that their tension can be maintained and adjusted so as to avoid the formation of transverse folds in

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  layer, which removes excessive leakage and

  comfort caused by folds before saturation.

  The subject of the invention is a disposable diaper which is shaped like an hourglass and comprises an absorbent body placed between an upper sheet and a support sheet and elastic elements fixed to

  the support sheet within 1.9 m of the absorbent body.

  The tension of the elastic elements is such that it does not form

  folds only along the sealing zones of the

  leg and practically no cross fold in the area

diaper crotch.

  The characteristics of the invention will emerge

  moreover from the description which follows, in a

  of realization given by way of nonlimiting example and represented in the appended drawing, on which

  Fig. l is a plan view of a realistic layer

  located in accordance with the present invention;

  Fig. 2 is a cross-sectional view,

  in front of the plane of line 2-2 in Fig. 1, from the region

diaper crotch; and -

  Fig. 3 is a cross-sectional view,

  in front of the plane of line 3-3 in Fig. 1.

  In the appended drawing to which reference will be made and in the various figures from which the same references are used to designate the same members, the general reference 10 designates a disposable diaper, provided with elastic bands and shaped, which is produced in accordance with the present invention. The layer has an hourglass shape and thus comprises a crotch region 12 and four parts of greater width which form ears 14, 16, 18 and 20. The layer comprises a rear support sheet 22 of an impermeable material, such as , by

  example, a polyethylene or polypropylene film

  lene. A top sheet 24, preferably made up of

  this, by a chemically bonded rayon or non-woven rayon-polyester sheet (for example, a latex of

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  resin) or by a spunbond sheet of poly-

  ethylene or polypropylene, is preferably fixed by lines of hot-melt glue to the support sheet, along the peripheral edges of the layer. An absorbent pad 26 is disposed between the upper sheet 24 and the support sheet 26, this pad can be

  in classic wood down (made, for example, from

  shooting of chemical, semi-chemical or thermo-mechanical pulp) or in another similar material. The layer further comprises an upper wadding sheet 28 and a lower wadding sheet 30 which, like the tampon, have shapes which substantially correspond to the hourglass shape. Of them

  elastic bands 34 and 36, which can be provided with

  hesitant on at least their lower surface and, optional-

  ment, on their upper surface or which can be app-

  plied separately against an adhesive at these points are glued by means of the adhesive to the support sheet 22 at locations immediately adjacent to the pad 26

  and, in any case, less than 1.9 cm from this buffer.

  The adhesive can be used in the form of a protective layer.

  continuous or in the form of separate lines or dots; it can be by any conventional adhesive which melts hot or adheres by pressure, but preferably an adhesive which, at ambient temperatures, is flexible and extensible (that is to say elastic). The strips 34 and 36 may extend only over the length of the crotch region 12 or extend over the ears of the upper cotton sheet 28, as shown in FIG. 3, so that the tension applied by the elastic bands to the support sheet 22 and to the upper sheet 24 which are heat-sealed is such that folds are formed only in the crotch sealing zones formed by the elastic bands and by the parts 40 and 42 outside these elastic bands and between the bands and the pad and that there appears only an insignificant number of folds in the crotch region 12. The upper cotton wool sheets and lower may consist of the paper or conventional fabric used until now 24-t 49

  in this technique (i.e., cellulosic fibers

  ques) or be formed from hydrophobic fibers (for example, polyester, polyethylene or polypropylene) or be made hydrophobic by suitable and conventional treatments (for example by means of resins). The elastic bands 34 and 36 can have variable widths but they are, in general, at least between approximately 3 and 5 mm wide and, at most, between approximately 10 and 12 mm wide, the widths between approximately 5 and 8 mm being preferred. The width of the adhesive layers can be slightly larger or slightly more

  small than that of the elastic bands and it is, typi-

  about 4 mm to 12 mm. Groups

  34 and 36 can typically have a thickness

  between a few hundredths of a millimeter (for example between 0.025 and 0.125 mm) and 15 or 20 mm, the greater thicknesses being more generally used in the case

mosses.

  A suitable method of making diapers

  according to the present invention, uses a conventional technique

  than manufacturing down that uses wood, pre-

  ference, wadding sheets to carry the down pad between them. This composite element is cut to the desired shape in an appropriate manner and then deposited on the support sheet 22 of larger dimensions. Before applying elastic bands 34 and 36, the layer,

  while it is moved in the manufacturing machine

  tion, is held by suitable means (for example, by clamping fingers) in a completely

  elongated and the elastic bands are applied and

  xed to the support sheet of the layer with an elongation of between approximately 40% and 80% of their length in the rest state, preferably between approximately 50% and 70% and, more advantageously still, between approximately 55% and 65%, (for example, typically, an elongation of 60%) The top sheet 24 is then applied and fixed,

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  for example, by adhesive means, around the edges

  layer devices. (outside of buffer 26).

  As described above, the top sheet 24 can be and is preferably also attached to the elastic bands 34 and 36. Reference is also made in this connection to US Pat. Nos. 4,022,456 and No. 4,081,301 for further details. other specific details relating to the apparatus and methods used to assemble elastic absorbent structures of the

  manner contemplated here and these patents should be considered

  res as incorporated into this description by the

  reference made to it here. Since it is preferred

  as the ends of the elastic bands, at the places

  cemrents o they pass over (or under) the ears of the absorbent pad are not attached to this pad, no adhesive is used in these parts of the strips. Thanks to the construction described above, during the contraction of the elastic bands, the back sheet and the other elements which are fixed to the elastic band are only contracted to form folds and the layer, in its

  together, takes the general shape of a bowl, which facilitates

  its positioning on the baby and thus allows better

their adaptation.

  The elastic bands 34 and 36 may be of any desired construction in any suitable material such as conventional rubberized fibers (or impregnated with another elastomer); they can possibly

  simply consist of a band of elastic resin

  resin or foam resin, which may or may not be covered with an adhesive. Such tapes are generally available commercially under the designation of double-sided transfer tapes (such as the tape adhering by pressure with strong adhesion, n0 465 from the company 3M Co, StPaul,

Minnesota, USA).

Claims (7)

"-CLAIMS   1. Disposable diaper, comprising a backing sheet (22), an absorbent pad (26) disposed on the backing sheet, and an upper sheet (24) covering the absorbent pad, and attached to the backing sheet on at least two opposite peripheral edges of the latter, characterized in that it comprises opposite elastic elements (34, 36) which are fixed to the support sheet at least in the central parts of the two aforementioned opposite peripheral edges to form crotch sealing zones along the lateral edges of the diaper, and are located at a distance of less than 1.9 cm from the absorbent pad, and the tension of which is such that folds form only along the crotch sealing areas and that only an insignificant number of transverse folds appear in the crotch region (12), when the layer is actually used.   2. Disposable diaper according to the claim   tion 1, characterized in that the absorbent pad has the shape of an hourglass and has ears (14,16,18,20)   spaced from the crotch region (12).   3. Disposable diaper after use according to one of claims 1 and 2, characterized in that an upper wadding layer (28) of fabric covering the pad, at least part of the elastic elements (34,36) is attached to this sheet of fabric.   4. Disposable diaper according to claim   tion 3 characterized in that the upper wadding sheet   re (28) of fabric covering the ears of the tampon, the   elastic elements are arranged above these ear-   the. 5. Disposable layer after use according to one of claims 1 to 4, characterized in that the upper sheet (28) and the support sheet (22) are bonded.   to each other along their peripheral edges. 24711 4.9   6. Disposable diaper after use according to one of claims 1 to 5, characterized in that the sheet   upper is glued to the support sheet by techniques   bonding with hot melt adhesive or heat seal.   7. Disposable diaper according to one of the resales   dication 1 to 6, characterized in that the elastic elements   ticks (34,36) are lengthened by 50% to 70% before being attached to the support sheet (22).