Abstract
The construction and evaluation of a novel instrument for measuring air permeability characteristics of fabrics at differential pressure levels up to 3 bar is described. Fabrics requiring such testing have reduced porosity, leading to low air permeability, and as a result, the use of standard air permeability testers is impractical. A pressure-related measuring technique is therefore employed in the new instrument, which also enables air permeability characteristics to be measured over a range of pressure levels. The instrument is also equipped for the measurement of distension of the test specimens, so that any variation of fabric air permeability with pressure can be investigated. It was demonstrated that the technique can still be applied, in conjunction with a low pressure transducer, for the measurement of fabrics having normal levels of air permeability.
Published Version
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