Changes in dynamic drapability of polyester fabrics with weave density, yarn twist and yarn count obtained by regression equations.

Some new parameters of dynamic drapability, such as revolving drape increase coefficient (D_r), revolving drape coefficient at 200 rpm (D₂₀₀), and dynamic drape coefficient at swinging motion (D_d), have been defined using a device of dynamic drape tester and the regression equations are derived from mechanical parameters of fabrics obtained from KES system. These equations have been applied to polyester fabrics used for women's fine dress materials and the effects of weave density, yarn twist and yarn count on these parameters studied. It is observed that D_r and D_d have a maximum value at the optimum weave density. These values increase with the increase in yarn twist in the case of Dechine fabrics. These values decrease in the case of taffeta fabrics, and increase in the case of georgette with yarn count. Changes in D₂₀₀ with weave density, yarn twist and yarn count are found to be little for all the fabrics. Node number decreases and conventional static drape coefficient (D_s) increases with weave density. [ABSTRACT FROM AUTHOR]