Patent ID: 8920731
Filing Date: 2014-12-30
Classification: B32B,D04H,G01N

Abstract:
1. A chemical gas sensor comprising: a flexible, gas-permeable, nonwoven web-based material substrate having a matrix that is composed of a plurality of inert thermoplastic, pulp, cellulose or staple fibers as either a major or minor portion, with a plurality of gas-sensitive fibers formed from a polymer that can absorb volatile organic compounds (VOC), and a plurality of electrically conductive fibers; said gas-sensitive fibers are intermixed with and associated spatially among a network of adjacent electrically conductive fibers, such that a change in physical morphology of said gas-sensitive fibers as a result of interacting with volatile organic compounds, causes a change in physical or dielectric properties that disrupts said network of adjacent electrically conductive fibers; said nonwoven-based material having a gas permeability of greater than 200 sq. microns of air; wherein said gas-sensitive fibers are formed from poly-ethylene-vinyl acetate (PEVA).