NZ202258A

NZ202258A - Disposable diaper,fluid trap formed by upper layer of absorbent material along side edges

Info

Publication number: NZ202258A
Application number: NZ202258A
Authority: NZ
Inventors: H Karami
Original assignee: Colgate Palmolive Co
Priority date: 1981-10-27
Filing date: 1982-10-21
Publication date: 1984-10-19
Also published as: AU560834B2; DE3238449A1; BR8206227A; CA1190702A; GB2108371A; FR2515007A1; NL8204155A; GB2108371B; JPH0316139B2; JPS5887304A; DK475382A; IT1148436B; IT8249364A0; ZA827608B; BE894809A; PT75737A; FR2515007B1; IE822566L; AU8978082A; GR77689B

Description

<div class="application article clearfix" id="description"> P: v. : !9 Priority D'.te{s): .^.'A0.'. Cornplata SpsssScctiGn Fiiod: Ciass: •_■ Pubiioaticn Data: ... . fl 9. .OCJ .1984 P, O, Journal ?io: .... ....... Patents Fonn No. 5 Number PATENTS ACT 1953 Dated COMPLETE SPECIFICATION DISPOSABLE DIAPER //We COLGATE-PALMOLIVE COMPANY a corporation organised under the laws of the State of Delaware, United States of America of 300 Park Avenue, New York, New York 10022, United States of America do hereby declare the invention for which //we pray that a Patent may be granted to mk/us, and the method by which it is to be performed, to be particularly described in and by the following statement: - 1 - 202258 BACKGROUND OF THE INVENTION FIELD OF THE INVENTION This Invention relates to disposable diapers of either rectangular or hour-glass configuration, and more particularly toj . | a disposable diaper having effective fluid^entrapment, : DESCRIPTION OF THE PRIOR ART In the past diapers have been provided with fluid traps usually formed of a waterproof material such as an Imperforate sheet of polyethylene or the like, i i One form of fluid trap Is formed from material of a ! fluid Impervious backing sheet which extends over the top sheet, TStls sometimes becomes disadvantageous because the backing sheet matolal may cause discomfort or chafing of an Infant, Another fluid barrier Is formed by utilizing strips of waterproof material forming a binder for the diaper, but this Is an expensive and dlffleult diaper to manufacture and the waterproof material again Is less comfortable than the usual top sheet material. It Is to be noted that the use of additional waterproof material Increases rigidity of the diaper thus making the proper fit thereof more dlffloult If not unlikely while In no w»y adding to the absorptive capacity of the diaper. -2- 2>Q7> 2 *s SUMMARY OF THE INVENTION The present invention overcomes the difficulties of the prior art by providing a fluid barrier that has the further advantage of additional absorptive capacity. The disposable diaper according to the Invention has a backing sheet, an absorbent pad on the backing sheet and a top sheet overlying the absorbent pad and bonded or heat sealed to the backing sheet along the peripheral edges thereof. The absorbent pad has a base layer and an upper layer along the peripheral edges thereof. The absorbent pad has a base layer of absorbent material and an upper layer of absorbent material along only the opposite side edges of the base layer forming a fluid trap and barrier. This arrangement can be used both In contoured diaperB, whether elasticized or not, and in rectangular shaped diapers, BRIEF DESCRIPTION OF THE DRAWINGS Fig, 1 is a plan view of a contoured diaper In accordance with the concepts of the present invention! Fig, 2 is a sectional view taken along the plane of line 2-2 in Fig, li Fig, 3 is a plan view of a rectangular, diaper according to the present invention! Fig. k Is a sectional view taken along the plane of line lJ—U In Fig, 31 and, i Fig. 5 is a schematic view showing an embodiment of forming the two layer absorbent pad aooordlng to the Invention, i J ) -3- ®P"Z2 5| DETAILED DESCRIPTION OF THE INVENTION With continuing reference to the accompanying drawing, wherein like reference numerals designate similar parts throughout the various views, referenoe numeral 10 generally designates i t a contoured diaper illustrated in Figs, 1 and 2 in accordance with the concepts^ of tine present invention. The diaper 10 Includes a backing sheet 12, an absorbent pad 14 and a top sheet 16. The backing sheet 12 is formed of any suitable waterproof material such as from an Imperforate sheet of polyethylene or the like. | The top sheet 16 is formed preferably from a non-chafing comfort inducing material such as from a non-woven sheet of polyethylene or polypropylene fibers. The absorbent pad 14 Is formed from any suitable absorbent material such as the wood-fluff commonly used In the art. Conventional absorbent pads of wood fluff are die cut to shape and sandwiched between top sheet and backing sheet. According to the invention the absorbent pad 14 Is provided with a base layer 18 and a two part upper layer 20 disposed along the opposite sides 22, 24 of the pad 14^/ The pad 14~~ Is die cut in an hour-glass^opnfiguratlon forming a crotch area/ 26 and opposed pairs of e^rs 2§/at the four corners of the diaperi The upper layer 20 extends ov er the ears 28, Alternatively, it ! is within the concept of this invention to provide the upper layer In only the crotch area of the diaper. As shown in Fig, 5i the-/ I ' f~P pad 114 may be provided with die cuts 116, 118 therein which ex-j ^ tend inwardly and convergingly. The flap 120 thus formed is folded Inwardly to form the upper layer. -4- cr-t 350225® " Elastic members in the form of elastlclzed strips 4$.::^ are bonded to the backing sheet 12,/if desired, and the top sheet Jls heat sealed or adhesively bonded to the backing sheet along thAlr peripheral edges. The upper layer 20, 120 form fluid barriers while also Increasing the absorptive capabilities of the diaper and during use may be compressed to increase the barrier effeot, "rT'h As can be seen, the upper layer 20 may form an extenslor. \L / _ftf^the base layer 18 by folding. Alternatively, the upper layer may be made In a separate piece. However, the folding over of the upper layer 20 seems to add at that point increased barrier effect. Referring now to Figs 3 and 4, herein is shown an embodiment 10 of the Invention for use in a rectangular diaper. The absorbent pad 214 of preferably wood fluff is sandwiched between the backing sheet 212 of preferably sheet polyethylene and the top sheet 216 of preferably non-woven fibers of polyethylene or polypropylene. The ends 219 of the backing sheet 212 are folded over the top sheet 216, The absorbent pad 214 includes a base layer 218 and an upper layer 220 along the opposite side edges 222 and 224 of the absorbent pad 214, The upper layer 220 may be preferably folded from the base layer 218 or can be positioned on the base layer 218 from separate pleoes. The various embodiments of the diaper can be positioned on an infant through use of conventional self-stick adhesive tabs, 09 </div>

Claims

<div class="application article clearfix printTableText" id="claims"> WHAT WE CLAIM IS:

1. A dsposable diaper comprising a backing sheet, an absorbent pad on said backing sheet and a top sheet overlying said absorbent pad and seeured to said baoklng sheet along the peripheral edges thereof, said absorbent pad including a base layer of absorbent material, and an upper layer of absorbent ■ ■ 2" material along only the Bide edges of said base layer.

2. A disposable diaper according to claim 1, wherein said absorbent pad is of an hour-glass configuration defining a crotch area and opposed pairs of outwardly extending ears, said ^Zo upper layer extending along at least said crotch area.

3. A disposable diaper according to claim 1, wherein said upper layer is integral with said base layer.

4. A dispoable diaper according to claim 1, wherein 9- 0 said upper layer is integral with said base layer and forms an extension of said base layer folded thereover. I - G-

5. A disposable diaper according to claim 1, wherein said upper layer is separate from said base layer.

6, A dispoable diaper according to claim 1, wheein said absorbent pad has pairs of angularly inwardly and converging spaced cuts therein, the portions between said cuts being folded over said base layer and forming said upper layers.

7, A disposable diaper according to claim 6, wherein said cuts form said absorbent pad Into an hour-glass configura-ticr when said portions between said outs are folded over to form said upper layer.

8. A disposable diaper according to claim 2, wherein said upper layer iff Integral with said base layer. Jg

9. A disposable diaper according to claim 2, wherein said upper layer Is separate from said base layer and extends over said ears. 10, A disposable diaper according to claim 8, wherein said upper layer extends over said ears. WEST-WALKER, McCABE per. ATTORNEYS FOR THE APPLICANT: </div>