Patent ID: 8263206
Filing Date: 2012-09-11
Classification: B32B,B65B,B65D,Y10T

Abstract:
1. A perforated film composition, comprising at least three layers, and wherein at least one layer is an inner layer with a lower softening and/or melting temperature, as compared with the respective softening and/or melting temperatures of at least two outer layers, located at opposite surfaces of the inner layer, and wherein, when the film composition is exposed to an elevated temperature, the at least one inner layer softens or melts to such an extent, that upon exposure to a compression force, a sufficient number of perforations are sealed in the inner layer, to impart an increased moisture barrier to the film composition, and wherein, the layers of the film composition have perforations with a common center, and wherein each of the outer layers is independently a film comprising at least one thermoplastic polymer, or independently a foamed thermoplastic polymer resin, and wherein the inner layer is a film comprising at least one thermoplastic polymer, or a foamed thermoplastic polymer resin.