Patent ID: 8318618
Filing Date: 2012-11-27
Classification: A61F,A61L,B32B,D01D,D01F,D04H,Y10T

Abstract:
1. A method of producing a mat comprising: producing a web having a tangle of oriented parallel polymer strands contact fused at tangle points thereby defining an orientation of the web, wherein the strands have a diameter distribution such that at least the smallest 80% of strands have a mean strand diameter between 2 and 4.5 μm with a standard deviation within 2 μm and strand diameters are unimodal with a regression coefficient measure of fit to a normal distribution of at least 0.96; laying 15 to 50 sections of the web in a stack so that the orientations of at least two web sections differ by an angle between 3° and 90°; and applying heat and pressure to the stack of webs to produce a mat, the heat being at a temperature above a glass transition temperature and below a melting point of the polymer.