Stock material or miscellaneous articles – Structurally defined web or sheet – Nonplanar uniform thickness material
Patent
1997-12-17
1999-07-20
Loney, Donald
Stock material or miscellaneous articles
Structurally defined web or sheet
Nonplanar uniform thickness material
428402, 428913, 602 56, 602 58, 604358, 604364, 604368, 6043851, B32B 100, A61F 1315
Patent
active
059254394
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a liquid-absorbent sanitary cellulose product, such as diapers, sanitary napkins or the like, provided with a liquid-proof back layer and an absorbent body. The latter may consist of a pad of cellulose flakes or a so-called air-laid material in usual manner. The latter is used in particular for thin sanitary cellulose products, such as sanitary napkins or panty shields.
Moreover it is known from the prior art to insert so-called superabsorbers into sanitary cellulose products in order to improve their absorptivity and liquid retention capacity. As is generally known, such superabsorbers--i.e. super-absorbent hydrogel particles--are for example blown into the stream of flakes for forming an absorbent body, so that the hydrogel particles are distributed in the volume of the absorbent body.
The insertion and distribution of the hydrogel particles is especially problematic, as an even distribution over the entire base of the cellulose product is not desired. Instead, the majority of the hydrogel particles should be located where the greatest accumulation of liquid is to be expected during use of the cellulose product. Furthermore the use of hydrogel is limited, as too great a concentration of hydrogel particles causes the effect of so-called "gel-blocking", the blocking effect of the swelling particles preventing any further absorption of liquid as well as its transportation to areas of the absorbent body not yet supplied with liquid. Another substantial disadvantage of the conventional insertion of hydrogel particles into sanitary cellulose products consists in that the hydrogel particles can hardly be localized, their migration being undefined during the insertion and thereafter, so that often a disadvantageous distribution of particles is obtained. Thus the hydrogel particles cannot reach their full absorptivity.
Based on mentioned deficiencies it is an object of the invention to improve the structure of sanitary cellulose products of the generic type in such a manner that a defined insertion of hydrogel particles is possible.
This object is achieved by the features of the characterizing part of claim 1. Accordingly a storage layer is arranged between the absorbent body and the back layer, the storage layer consisting of a layer of non-woven material profiled in the direction of thickness of the product by chamber-like impressions being formed, into which are inserted super-absorbent hydrogel particles.
By means of this structure, the super-absorbent hydrogel particles are placed exactly in the desired target areas of the cellulose product and held there. Thus a loss of hydrogel material during production is reduced. Moreover, the storage layer thus obtained enables a reduction of thickness of the absorbent body so that for example a very thin air-laid material can be used. The actual storage of the body liquid takes place in the storage layer itself. Altogether, this favors the construction of thin sanitary cellulose products at a low material consumption.
Additional features, details and advantages of the invention can be taken from the subclaims or the following description, respectively, in which an embodiment of the subject matter of the invention is explained, taken in conjunction with the attached drawing, in which
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a partial vertical section through a diaper,
FIG. 2 shows a plan view of the non-woven layer forming the storage layer and
FIG. 3 shows a schematic view of a production arrangement for the storage layer with a back layer.
As can be seen from FIG. 1, a diaper designated in its entirety by 1 comprises a liquid-proof back layer 2 consisting of a thin polyethylene film, an absorbent body 3 formed of cellulose flakes or air-laid material, and a core layer 4 consisting of a non-woven material.
Between the back layer 2 and the absorbent body 3, a storage layer 5 is arranged, consisting of a non-woven layer 6 profiled in the direction of thickness D of the diaper 1. By means of this profiling, chamber-like impressions 7 are
REFERENCES:
patent: 4055180 (1977-10-01), Karami
Cummings Theodore P.
Loney Donald
Miller Steven W.
Rasser Jacobus C.
The Procter & Gamble & Company
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