Absorbent article

Details Absorbent article Absorbent article

1997-01-10

2000-08-15

Weiss, John G.

Surgery

Means and methods for collecting body fluids or waste material

Absorbent pad for external or internal application and...

6043851, 604367, A61F 1315

Patent

active

061039527

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The invention relates to an absorbent article comprising a liquid permeable topsheet, a liquid impermeable backsheet and an absorbent core comprising a layer of absorbent material, interposed between the topsheet and the backsheet, the backsheet comprising a perimeter having a front waist edge and a back waist edge, the layer of absorbent material comprising: back transverse edge, and the back transverse edge, front transverse edge and transverse edge.


BACKGROUND OF THE INVENTION

In the absorbent product technology, many attempts have been made to optimise the absorbent capacity and efficiency of absorbent cores by providing regions of increased or diminished basis weight and density in such cores. Also, it has been attempted to reduce leakage by providing barrier structures to the absorbent products to reduce liquid migration towards and beyond the periphery of the absorbent product.
From EP-A-052 413 it is known that for absorbent products, leakage of liquids along the waist edge can be prevented by providing a barrier sheet located between the topsheet and the backsheet and the waist ends of an absorbent article. The barrier sheet overlies the core at a waist end and prevent liquids from being squeezed out of the transverse edges of the core.
From EP-A-376 022 (Robertson) a unitary waistcap or waistband is known, wherein a unitary piece of elastomeric material extends from the perimeter of the absorbent product towards the core. The single piece of elastomeric material provides a waist elastic as well as a stand-up barrier overlying the topsheet at the waist end of the core.
From U.S. Pat. No. 4,695,278 (Lawson) an absorbent article is known comprising an elasticated stand-up barrier cuff in the leg areas.
From U.S. Pat. No. 4,795,454 (Dragoo) an absorbent article is known comprising an elasticated stand-up barrier cuff that is connected with a proximal edge to the absorbent article, and is located adjacent a gasketing cuff. A liquid-pervious topsheet terminates inboard of the proximal edge of the barrier cuff. Seal means are located along the proximal edge to prevent wicking of liquids underneath the barrier cuff.
From EP-B-0 304 631 it is known to coat and seal lateral portions of a liquid-permeable topsheet with a hot-melt adhesive to prevent lateral leakage of liquids.
In U.S. Pat. No. 4,935,022 (Lash) an absorbent structure is disclosed which has a lower storage layer and an upper acquisition/distribution layer comprising chemically stiffened cellulose fibers and absorbent gelling material. The upper acquisition/distribution layer is of larger surface area than the underlying storage layer. The lower storage layer is formed of an insert, which is placed relative to the upper acquisition/distribution layer such that about 75% of the absorbent gelling material in the lower layer is found in the front two-thirds section of the absorbent structure, and at least 55% of the total amount of absorbent gelling material is found in the front half section.
In U.S. Pat. No. 4,685,915 (Hasse) an absorbent product is disclosed having a core comprising hydrophilic fibers and absorbent gelling material, the core having an area of higher average density and basis weight than the end portions of the core. The area of higher average density and basis weight is located near the center or the front of the absorbent product.
In U.S. Pat. No. 4,834,735 (Alemany) an absorbent core is disclosed having a storage zone and an acquisition region of lower average density and basis weight than the storage zone. The core comprises a mixture of hydrophilic fibers and absorbent gelling particles. The acquisition region is located towards the front of the absorbent core.
In European Patent No EP-B-0 330 675, it is disclosed to introduce absorbent gelling material into specific locations of a horizontal, or x-y plane of an absorbent core using pulsed powder spray guns.
In International patent applications no's WO 91/11163 and WO 91/11165, a dual layer core is disclosed comprising a lower storage layer and a

REFERENCES:
patent: 5762641 (1998-06-01), Bewick-Sonntag et al.

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