Relation between physical structure and dyeability of nylon 6 fibers. I. Effect of tension and heat setting on dyeability of nylon 6 fibers

Abstract

Orientation by x-ray diffraction, dichroic orientation, and orientation by birefringence were measured on nylon 6 fibers subjected to stress relaxation or dry heat setting after stress relaxation. Orientation in the crystalline and noncrystalline regions increases with tension to an especially great extent in heat setting. Dyeability of the fibers subjected to stress-relaxation treatment is only slightly affected by tension, and dyeability of fibers subjected to dry heat setting or steam setting decreases with tension. The larger the molecular weight of dye used, the more marked the behavior becomes. Thus, depending on the dyes used, tension variations in weaving or knitting of nylon 6 fibers may be a cause of stripiness of dyed fabrics.