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US5176668: Absorbent structure designed for absorbing body fluids

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Filing Information

Inventor(s) Leo J. Bernardin ·
Assignee(s) Kimberly-Clark Corporation ·
Primary Examiner Rosenbaum; C. Fred ·
Assistant Examiner Mark O. Polutta ·
Application Number US7409210
Filing date 09/19/1989
Issue date 01/05/1993
Predicted expiration date 01/05/2010
U.S. Classifications 604/368  · 604/374  ·
International Classifications A61F 1315  ·
Kind CodeA
International Classifications 604358;368;378;379;374;377;380 ·
Related U.S. Application DataCROSS REFERENCE TO RELATED APPLICATIONS
This is a divisional of copending, commonly assigned U.S. patent application Ser. No. 07/083,475 filed Aug. 6, 1987, by Leo J. Bernardin, now U.S. Pat. No. 5,000,650 which is a continuation of copending, commonly assigned U.S. patent application Ser. No. 06/886,780 filed Jul. 17, 1986, by Leo J. Bernardin, now U.S. Pat. No. 4,699,619, which is a continuation-in-part of copending, commonly assigned U.S. patent application Ser. No. 06/656,384 filed Aug. 31, 1984, by Leo J. Bernardin, now abandoned, which is a continuation-in-part of copending, commonly assigned U.S. patent application Ser. No. 06/599,882, filed Apr. 13, 1984, by Leo J. Bernardin, now abandoned.
19 Claims, No Drawings


Abstract

An absorbent structure designed for use in absorbent pads such as diapers is disclosed. According to a first aspect of the invention, absorbent pads are provided which comprise at least two layers of cellulosic fibers (fluff) of different densities or average pore size ranges. When the absorbent structure is incorporated in a diaper, the lower density element extends to the full length and width dimensions of the normal absorbent component of the diaper. The higher density element lies beneath at least a portion of the lower density element. According to various embodiments of the present invention, it can run as a strip from the target zone to the back waist of a diaper, it can run along a central portion extending the whole length of the diaper, or it can underlie the entirety of the lower density element. The higher density element (or the element having a lower average pore size) wicks waste fluid from a lower central portion of the diaper, and thereby transports the fluid upwardly and also transfers it to the lower density element (or the element of greater average pore size). According to a second aspect of the invention, which may be incorporated with the first aspect just described, a portion of superabsorbent material is placed beneath the higher density layer, (or layer of lower average pore size), such that an additional reservoir for absorbing waste fluid is provided.

Independent Claims | See all claims (19)

  1. 1. A disposable absorbent article for absorbing body fluids, said absorbent article having end edges at opposite ends of the length of the absorbent article, said absorbent article comprising:a body facing liquid-permeable liner;an outer liquid-impermeable cover; andliquid-absorbing materials located between said liner and the cover, said liquid-absorbing materials comprising hydrophilic fibers and a water-insoluble superabsorbent material, said liquid-absorbing material defining:a target area where liquid waste initially accumulates; anda reservoir containing superabsorbent material which superabsorbent material is located more towards one of said end edges than the other and is localized in an area laterally removed from said target area;wherein said target area has a lower average density and a lower basis weight than said reservoir.
  2. 19.19. A disposable diaper having end edges at opposite ends of the length of said diaper, said diaper comprising:a body facing liquid-permeable liner;an outer liquid-impermeable cover; andliquid-absorbing materials located between said liner and cover, said liquid-absorbent materials comprising hydrophilic fibers and a water-insoluble superabsorbent material, said liquid-absorbing materials defining:a target area where liquid waste initially accumulates; anda reservoir containing superabsorbent material, which superabsorbent material is located more towards one of said end edges than the other and is localized in an area laterally removed from said target area;wherein said target area has a lower average density and a lower basis weight than said reservoir.

References Cited

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Other Publications

"Liquid Advance in Layered Fibrous Composite"; by H. Reed Nguyen and D. F. Durso; Nonwovens 1984; pp. 107-110.

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