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A remarkable decrease in breaking force of nylon 6 yarn after removing a constrain load during heat treatment has been found to depend on its temperature. This phenomenon is analyzed mainly with microscopic observation and discussed based on the relation between formation of kink band and thermal shrinkage. It is concluded that the breakage along kink band formed by rapid thermal shrinkage causes the above phenomenon. As a model for the above, a deformation mechanism for the kink band formed by uniaxial compression of nylon 6 bristle is discussed in comparison with that in fatigue process of nylon 6 fiber.

Studies on kink band of nylon 6. (Part 2). Formation of kink band by thermal shrinkage of nylon 6 fiber.