Reports on an automated apparatus and test procedure to determine the convective and diffusive gas and vapor transport properties of small pieces of woven and nonwoven fabrics, membranes, and foams. The apparatus allows measurement of these properties in the very small quantities typical of material development programs, where the largest sample available may only be 110cm2 in area. The convectiondiffusion test method is useful for determining the gas flow resistance property and water vapor diffusion properties from a single experimental run. This eliminates the need for two separate tests, which is the usual procedure. The apparatus may also be used to perform separate tests for the diffusion property or the air permeability property, which may have some advantages when materials exhibit strongly concentrationdependent transport properties. The convectiondiffusion test method is wellsuited for rapid screening and comparison of the properties of a large number of materials with widelyvarying transport properties.
International Journal of Clothing Science and Technology – Emerald Publishing
Published: May 1, 2000
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