Patent ID: 7354475
Filing Date: 2008-04-08
Classification: A41D,A62D,B01D,B01J,B32B,Y10T

Abstract:
1. A gas and water vapor pervious adsorption filter material having a protective function against biological and chemical noxiants and poisons, especially biological and chemical warfare agents, the adsorption filter material comprising a multilayered layer construction having; a sheetlike first carrier layer; a sheetlike second carrier layer; and an adsorbing layer interposed between the first carrier layer and the second carrier layer, said adsorbing layer comprising an activated carbon fiber fabric which consists of continuous filament fibers of carbonized and activated polyacrylonitrile which is adhered to the first carrier layer and the second carrier layer by means of a thermoplastic adhesive, wherein the activated carbon fiber fabric is adhered to said first carrier layer and to said second carrier layer by noncohering adhesive dots applied on both sides of said activated carbon fiber fabric, the adhesive covering the activated carbon fiber fabric to not more than 20% based on one side of the activated carbon fiber fabric; wherein the adhesive has been printed onto the activated carbon fiber fabric in the form of an irregular grid or pattern calculated and applied under computer control such that any lane formation is avoided in the use state of the adsorption filter material; and wherein the adhesive has been applied by printing through a screen whose clear diameter for the application of adhesive is in the range of from 50 to 1000 μm.