Abstract
When fabrics are bent or creased in other than the warp or fill directions, the de formation of the individual yarns has a torsional component. The interaction of this component with the twist of the yarn should result in anisotropic creasing behavior in the fabric. Crease recovery as a function of test direction was measured for a number of fabrics. Anisotropy attributable to torsion-twist interaction was found in cellulosic fabrics when strong directional effects due to such factors as twill ribs were not introduced by the fabric construction. The effect could be qualitatively related to the yarn twists. With fibers of greater intrinsic resilience, such as wool, nylon, or acetate, the crease recovery was essentially isotropic. When cellulosic fabrics were treated with dimethylol urea, their crease recovery not only became greater but also was more nearly isotropic.
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