Abstract
In this paper, the permeability of wet fabrics is discussed by applying the parameters A and B, which were defined in order to indicate the air permeability of the fabrics in the previous paper.
Parameter A is based on Bernoulli's theorem, depending the clearance of woven or knitted fabrics, while parameter B is deduced from Poiseulle's law, concerning the capillary structure of fabrics and yarns. Relations between regain and the parameters are investigated on several kinds of fabrics. The results are
1) Fabrics of filament yarns at high regain : The parameters rapidly approach to the dry values.
2) Fabrics having large cover factor and capillary effects where A<B at dry state : The value B becomes large, changing the order of A and B inversely while drying.
3) Fabric having small cover factors and nozzle effects where A>B : Both values A and B vary greatly. In many fabrics, the value A does not become zero at 100% regain.
The clearance structure in fabrics and yarns, that is, the dimension and variation of small holes in them could be effectively estimated from the relationship between fabric regain and the paramaters.
