Steam and heat setting of nylon 6 fiber. I. Effect of dry heat setting and steam setting on young's modulus and specific gravity of nylon 6 fiber

摘要

AbstractNylon 6 fiber subjected to steam setting exhibits many differences in properties from that subjected to dry heat setting. Undrawn nylon 6 filaments were subjected, under tension or in the tensionless state, to dry heat setting at 140, 160, and 180°C. And to steam setting at 110, 120, and 130°C. Young's modulus and the bending modulus were measured, and the variation of density resulting from dry heat setting was observed with a density‐gradient tube, dryn‐butyl bromide and benzene being used as the medium. These results show that specific gravity is increased by heat‐setting processes, especially by steam setting. This is considered to be caused by the increase in the degree of crystallinity. Young's modulus seems, however, to be rather decreased by steam setting; this may be attributed to the role of water molecules in loosening the molecular spacement of the fibrous structure in the case of steam