Part II: Textile Fabrics

A series of 45 different open-weave fabrics have been woven in four weave patterns and a large range of fabric weights and porosities. Laboratory physical data on all these fabrics are pre sented. Porosity data are presented in dimensionless form, and it is shown that such data for plain, basket, and mock-leno weaves show a high degree of correlation among themselves. This is not only true for different weave types but also for a wide range of fabric weights. It is shown that the yarn diameter, which is effective in determining the projected fabric open area, depends mainly upon the type of weave, and for any particular weave the ratio of yarn diameter to the square root of the denier is nearly constant. The ability to predict effective yarn diameter, for the type of fabrics produced, makes it pos sible to predict fabric open area and thus porosity of similarly produced fabrics. Complete descriptions of the fabrics are given, together with sample calculations illustrating the possibility of predicting fabric porosity.