Abstract
Polyester fabric heated in hot air was cooled by various methods and investigated the effect of cooling condition on the crease recovery angle of fabric and Young's modulus and elastic work recovery of fiber. Furthermore, the change of fine structure of polyester fiber was studied by density gradient tube and X-ray diffraction.
The following results were obtained:
1) Polyester fabrics heated at different temperature of hot air were cooled gradually or rapidly in water, air and ethylene glycol down to 100-0°C. Crease recovery angle is considerably affected by cooling method. i.e., the higher the cooling temperature, the greater the crease recovery angle. The best result is obtained by gradual cooling from 100°C. Especially, it is desirable to cool gradually in the vicinity of glass transition temperature of polyester fiber.
2) Young's modulus and elastic work recovery obtained by the stress-strain curve of the fiber increase with the rise of cooling temperature. These increased by gradual cooling, and decreased by rapid cooling.
3) Crystallinity is almost no change by cooling method. X-ray patterns and lattice spacing of (010), (110) and (100) plane are not changed by cooling method.
