Patent ID: 6177158
Filing Date: 2001-01-23
Classification: A22C,B29C,B29D,B29K,C08J,Y10T

Abstract:
A tubular film comprising a material which has been regenerated from a solution of cellulose and dried, said tubular film, after regeneration, being longitudinally stretched by from 10 to 40 percent and simultaneously transversely stretched by from -20 to +20 percent while wet, said stretch being maintained during drying, the combined longitudinal and transverse stretch being sufficient to increase the surface area of the film by at least ten percent from the surface area immediately after regeneration, said tubular film having a wall thickness of from about 60 to about 90 percent of the same tubular film without said combined stretch after regeneration and a longitudinal tensile strength greater than the same tubular film of the same thickness except that it is longitudinally stretched by less than 10 percent, said tubular film having a rewet longitudinal tensile strength greater than 6000 psi.