The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 20, 1984
Filed:
Nov. 06, 1980
Eckhard C Schwarz, Neenah, WI (US);
Biax Fiberfilm Corporation, Neenah, WI (US);
Abstract
There is described a process for producing a novel porous fabric having at least 100,000 surface perforations per square inch by the biaxial stretching at ambient temperatures of a sheet of a composite fiber-film substrate formed by hot calendaring, inter alia, a laminate of a woven or non-woven web of fibers having a residual elongation of at least 40% and a synthetic polymeric film material constituting at least 20% by volume of the composite fiber-film substrate. Stretching of the composite fiber-film substrate is effected by passage through interdigitating grooved rollers having grooves spaced at a distance of less than one millimeter times the web basis weight in grams per square meter with concomitant control of the velocity of introduction of the composite fiber-film substrate into the nip of the grooved rollers to substantially the identical surface velocity of the grooved rollers. Biaxial stretching is effected to at least a stretch ratio such that a web of the fibers and film of the synthetic polymer taken individually and biaxially stretched exhibit a difference of at least 5.degree. in the aqueous contact angle and a difference of at least 5000 psi in the initial tensile modulus. The novel porous fabric is comprised of elongated fibers embedded in a film substrate surface with openings of at least 100,000 perforations per square inch and is useful as a leather substitute, synthetic paper and the like.