Abstract
We carried out various experiments before washing to examine the relationship between the "air permeability" and "thermal insulation" of several marketable fabrics. The types of fabrics we used in these experiments were cotton, cotton/polyester blend, cupra rayon/silk blend, nylon, polyester, and, polyester/polyurethane blend. In addition, we then washed the fabrics and carried out the same experiments again. The results obtained are as follows : 1) Although "air permeability" and "thermal insulation" are related, our studies could not definitely establish the relationship between them. 2) The relationship between "air permeability" and fabric thickness depends on the type of fabrics. 3) After washing, "air resistance" is reduced due to a lack of necessary finishing processes.
