Effect of entropy change during texturing on hairiness of textured filament yarns

During filament texturing,its entropy change shows an increased tendancy.The entropy change during texturing is a function of state,which is proportional to the logarithm of the disordered degree of the textured yarn and hence has significant impact on the surface state and hairiness of the textured yarn.To find out the relationship between the entropy change and the surface structure of the textured yarn,5 ATY and 5 differential shrinkage multi-air textured yarns were spun and necessary tests were made.The experimental results revealed that both the hairiness index and hairiness value increased as the entropy change and disordered degree increased during texturing.Differential shrinkage multi-texturing based on ATY led to a continuous increase in entropy change and disordered degree of the yarn and a change in its hairiness length-number curve,i.e.,short hairiness(shorter than 1.0 mm) index was down,and long hairiness(longer than 1.0 mm) index was up.