Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1997-09-05
1999-01-05
Bell, James J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
156290, 156212, 156229, 428903, 428910, 442340, 442346, 442382, B32B 2714
Patent
active
058559922
ABSTRACT:
A waterproof multi-layered non-woven fabric having good vapor permeability and method for its production are provided. At least one layer of coarse melt-spun filaments of a thermoplastic polymer is thermally bonded at intermittent points to at least one layer of fine melt-blown microfibers. The bonded layers next are subjected while heated to a force in at least one direction in the absence of tearing so as to accomplish the permanent elongation of coarse melt-spun filaments and the straightening of fine melt-blown microfibers in the direction of the force in the substantial absence of drawing. Fine melt-blown microfibers when straightened in this manner form a less thick and denser array within the resulting fabric. The resulting product is capable of deterring the passage of liquid water, exhibits substantial vapor permeability, and exhibits a reduced basis weight. According, the product is suitable for use as a filter to remove solid particles from a gas, as a diaper component, to form protective clothing for medical applications, in the production of a roofing material, etc. The resulting product provides significant economic advantages since a reduced quantity of thermoplastic polymer is required per unit area of product while retaining desired service characteristics.
REFERENCES:
patent: 5540976 (1996-07-01), Shawyer et al.
patent: 5582903 (1996-12-01), Levy et al.
patent: 5733635 (1998-03-01), Terakawa et al.
patent: 5766737 (1998-06-01), Willey et al.
Bell James J.
Corovin GmbH
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