Patent ID: 8118136
Filing Date: 2012-02-21
Classification: B32B,Y10T

Abstract:
1. A process for making an acoustically active polymeric foam comprising the following steps: (a) providing at least two initial polymeric foams, each having opposing major surfaces; (b) perforating the initial polymeric foams through one major surface all the way the foam and through the opposing major surface to form perforated polymeric foams having perforation channels that extend in a continuous and linear fashion all the way through the perforated polymeric foam; and (c) laminating the perforated polymeric foams together such that a perforated surface of one perforated polymeric foam adheres to a perforated surface of another perforated polymeric foam; wherein step (b) comprises compressing the initial polymeric foams into a compressed state and then perforating the initial polymeric foams while in a compressed state and wherein perforating occurs by applying a roller with multiple spike extending off from the roller into each initial polymeric foam such that the spikes penetrate through the initial polymeric foam as the initial polymeric foam travels under the roller.