Breathable fabric and sack made therefrom
AssigneeE. I. Du Pont de Nemours and Company
InventorAlan D. Stall
Life of this patent
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Abstract
A breathable fabric which comprises a structure woven from thermoplastic polymeric tapes, wherein the woven structure is coated with a foamed permeable coating. The tapes are preferably made from polyethylene having a density between 0.940 and 0.970 g/cm.sup.3. The coating is preferably a lace coating made from polyethylene having a density between 0.910 and 0.940 g/cm.sup.3. The fabric is useful for making breathable sacks.
Claims13
A breathable fabric comprising a structure woven from synthetic thermoplastic polymeric tapes, said structure having a foamed porous lace-like coating of synthetic thermoplastic polymeric material bonded to at least one side thereof.
A breathable fabric comprising a structure woven from tapes of polyethylene having a density between 0.940 and 0.970 g/cm.sup.3, said structure having a foamed porous lace-like coating of polyethylene bonded to at least one side thereof.
A process for making a breathable fabric comprising melt extruding a coating of a synthetic thermoplastic polymer onto and bonding the coating to a woven structure of synthetic polymeric tapes, wherein the coating material contains a blowing agent in an amount sufficient to make the coating into a porous lace-like layer upon extrusion.
A process according to claim 11 wherein a web of the coating material is extruded from a stationary slot die onto a web of the woven structure travelling beneath and transversely to the direction of extrusion of the web of coating material.
Dependencies are inferred from the claim text.