RESISTANCES OF FABRICS TO WATER VAPOR TRANSMISSION

Abstract

Total resistance R of fabrics to water vapor transmission was divided into apparent inner-resistance R₁^a and outer-resistance R₂^a from linear relation between R and number of layers for multilayered fabrics. The change in R through the adhesion of a nonwoven interlining to each woven fabric was studied in connection with R₁^a and R₂^a. This study also dealt with resistances of woven fabrics having relatively fuzzy uncertain surface.
Practical outer-resistance tended to decrease to a larger extent through the adhesion in the case of woven fabrics having rougher structure. The thickness of still air layer above the woven fabrics may be different from that above the same woven fabric which composed laminated one. This suggests that the thickness of still air layer above the fabrics may depend on the inner structure of the fabrics.