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US 4,819,458 AGranted
Heat shrunk fabrics provided from ultra-high tenacity and modulus fibers and methods for producing same
AssigneeAllied-Signal Inc.
InventorsSheldon Kavesh, Dusan C. Prevorsek, Gary A. Harpell
Life of this patent
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Abstract
Ultrahigh molecular weight polyethylene fibers of high tenacity and modulus shrink controlled amounts at temperatures in the range of 100.degree.-145.degree. C. Fabrics and twisted multifilament yarns of these fibers are heat-shrunk or heat-set at these temperatures.
Claims10
A method for preparing fabrics which comprises the steps:
- (a) forming a fabric from stretched fibers of tenacity at least about 20 g/denier and tensile modulus at least about 600 g/denier containing polyethylene of weight average molecular weight at least about 500,000, and
- (b) heating the fabric at a temperature between about 120.degree. C. and about 145.degree. C. sufficient and for a time sufficient for the fibers to shrink between about 1% and about 10% of their length in the fabric formed in step a.
Dependencies are inferred from the claim text.