Patent ID: 6358592
Filing Date: 2002-03-19
Classification: D04H,E04B,Y10T

Abstract:
An acoustical fibrous insulation media for attenuating sound waves passing through a first major surface of the media, comprising:a non-woven mat of thermoplastic fibers, the thermoplastic fibers having a mean diameter of less than about 13 microns and being formed from a polymeric material containing between 0.2% and 10% by weight nucleating agent; the mat having a density of less than about 60 Kg/m3; the mat having first and second major surfaces and a fibrous core; the first major surface having an integral skin thereon formed by melting fibers at and immediately adjacent the first major surface of the mat to form a thermoplastic melt layer which is subsequently solidified into the skin on the first major surface of the mat; the integral skin being an air permeable skin and airflow resistance barrier that attenuates sound waves; the mat having a Fraiser air permeability of less than 75 cubic feet per minute per square foot of surface area; and the thermoplastic fibers of the mat being point bonded together at spaced apart locations to increase the integrity of the mat.