Air Permeability of Multilayered Nonwoven Fabrics: Comparison of Experimental and Theoretical Results

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Abstract
The experimental and theoretical air permeabilities of twelve multilayered. needle punched nonwoven samples are compared in this paper. Samples are made from ceramic and glass with varying layer structures. The density and diameter of all fibers used to make individual webs are approximately the same, and so the fabric samples made from these webs are assumed to be homogeneous, multilayered structures. The porosity of all fabric structures is greater than 0.96. Thus, the theoretical air permeability is based on a modified Kozeny equation. Experimental measurements involve the Frazier air permeability tester.