Patent ID: 6427419
Filing Date: 2002-08-06
Classification: B29C,B29K

Abstract:
A method of increasing the permeability of a film comprising:providing a film having a thickness of from about 0.3 mil to about 9.8 mils; at least one layer comprising a first material comprising a polymeric material selected from the group consisting of olefinic resins, poly(vinyl chloride), ionomers, nylons, and homo- and co-polymers of ethylene; and a plurality of solid particles incorporated into the at least one layer, wherein the solid particles: comprise a second material different from the first material; and have a higher susceptibility than the first material to a selected physical force selected from the group consisting of spark discharge, inductive heating, infrared heating, magnetic force, ultrasonic excitation, microwave irradiation, e-beam irradiation, and laser irradiation; and applying the selected physical force to affect the particles and create perforations in the at least one layer, whereby the permeability of the at least one layer is increased.