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AssigneeCorovin GmbH
InventorStefan Etzold
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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.
A multi-layered non-woven fabric of reduced weight having good vapor permeability and the ability to deter the passage of water consisting essentially of (1) at least one layer of coarse melt-spun filaments of a thermoplastic polymer, and (2) at least one layer of fine melt-blown microfibers of a thermoplastic polymer, wherein said layers (1) and (2) were thermally bonded together at intermittent points while in a surface-to-surface relationship and subsequently were subjected while heated to a force in at least one direction in the absence of tearing whereby coarse melt-spun filaments of layer (1) were permanently elongated in the direction of said force and fine melt-blown microfibers of layer (2) were straightened in the direction of said force in the substantial absence of drawing so as to form a denser array of said microfibers having a lesser thickness within the resulting fabric.
A method for the production of a non-woven fabric of reduced weight having good vapor permeability and the ability to deter the passage of water comprising:
Dependencies are inferred from the claim text.