Abstract
Polynosic fiber and tire yarn was frozen in water and dil. NaOH solution, and following results are obtained, as to changes in physical property compared with both fibers.
1) When freezing the fiber was repeated in water, the increase in iodine absorption and the decrease in degree of polymerization of tire yarn was more than that of polynosic fiber.
This is due to the fact that the increase in inner surface area of tire yarn is greater than that of polynosic fiber during freezing, and a part of para-stable structure breaks down easily.
2) When freezing was repeated in NaOH (0-10g/l) solution, wet strength dry strength of tire yarn increased and the ratio became more than 90%.
3) The action of ordinary alkali treatment could not be replaced by the action of freezing in NaOH solution.
