Patent ID: 7601659
Filing Date: 2009-10-13
Classification: B32B,D04H,D21F,Y10T

Abstract:
1. A multi-layer fabric structure comprising at least five layers, said layers comprising: a) a first, surface layer comprising coarse staple fibers; b) a second layer of nonwoven fabric having a mean hydraulic pore diameter of 1 to 10 micron, a thickness of 100 microns or less and a porosity of about 50% or greater, said second layer comprising filaments having diameters within the range of 0.1 to 5 microns; c) a third layer of fabric, having a mean hydraulic pore diameter of less than 10 microns and a porosity of 50% or greater; d) a fourth layer disposed between the second layer and the third layer, the fourth layer comprising coarse filaments or staple fibers, and having a mean hydraulic pore diameter an order of magnitude greater than the mean hydraulic pore diameter of the second layer and the third layer; and e) a fifth layer contacting the third layer, the fifth layer comprising coarse filaments or staple fibers, and having a mean hydraulic pore diameter an order of magnitude greater than the mean hydraulic pore diameter of the second layer and the third layer.