Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Patent
1993-07-30
1995-10-10
Lesmes, George F.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
428114, 428171, 428286, 428299, 428301, 428298, 428296, 428297, 428903, 428288, 604358, 604366, 604370, 6043851, D04H 104
Patent
active
054569710
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a covering web, suitable for use in the production of absorptive products such as diapers and sanitary napkins.
BACKGROUND OF THE INVENTION
In German Patent Application P 39 20 066.3 a compound web material, which can be applied as a covering web, is described; said compound web material is characterized by a mixture of coarse filaments and free microfibers without the presence of discrete layers with a phase boundary between the individual components. Rather the compound web material is formed on a layering device by simultaneously depositing with blowing both components, so that the compound web material consists of a mixture of coarse filaments and fine microfibers and thus represents an integrated material.
An important advantage of this compound web material lies in the fact that due to the formed mixture of different components there is no gradient over the cross section with respect to the different diameters of the fibers. Nevertheless, both functions peculiar to the different fiber components are combined. These respective functions extend over the entire cross section of the compound web material.
Since, when viewed over the entire cross section, the individual components are mixed together, the components can also exert the functions assigned to them over the entire cross section, a feature that is not possible with known layered materials with discrete phase boundaries. A conceivable function with respect to the free microfibers is the filtration or the transport of liquids. Due to the distribution of the microfibers over the layer thickness of the compound web material, a higher rate of filtration can be obtained, with the distribution being achieved as a consequence of thorough mixing.
Thus, the aforementioned German Patent Application describes in total an improved compound web material, which exhibits higher efficiency with respect to the functions intrinsic to the individual components. Thus, significantly improved applications are opened to the compound web material.
Nevertheless, there are still fields of application in which even said compound web material cannot be optimally used. Therefore, the invention is based on the problem of designing said compound web material in such a manner that the field of application is even more expanded and more efficient, in particular when using the compound web material as a covering material for the absorptive body of absorbent products, such as diapers, sanitary napkins or the like.
SUMMARY OF THE INVENTION
The fundamental idea of the invention consists of designing the compound web material in such a manner that it exhibits different regions, which correspond to the respective requirements and in which the mixing ratios of the two components (coarse filaments and fine microfibers) are different. Thus, separate regions of compound web material can be realized, and said regions can assume different functions.
In the case of diapers, for example, such a web material has an important advantage, when the compound web material or covering web is used for the absorptive body of the diaper. Owing to the different mixing ratios different regions of the diaper surface can be realized, said regions being desired with respect to the permeability to moisture or the moisture-repelling function.
At the same time, it is possible to provide for hydrophilicity only in the central section of the covering layer of the diaper and thus to design here the actual drainage region (i.e., an area having an increased drainage capability). The two side strips can be designed so as to be hydrophobic in an advantageous manner.
In the invention it is provided, e.g., that the compound web material comprises only partially two components so that one or more discrete regions are provided that are formed exclusively by the coarse filaments. In this embodiment there are, thus, discrete regions exhibiting no mixture of coarse and fine filaments.
Preferably said discrete regions are formed parallel to each other and in strips that are spaced apart from ea
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Choi Kathleen L.
Corovin GmbH
Lesmes George F.
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