Effects of texturing entropy change on bending stiffness of textured filament yarns

During the course of texturing,the entropy of the filament structure system was increased.Corresponding changes in its bending stiffness always occurred with this phenomenon at the same time.To quantitatively analyze the relationship between the entropy changing and stiffness changes of a linear model during texturing,cantilever measuring was used to measure the bending rigidity of the textured yarns while the EIB to test their diameter and then the relative entropy value were figured out.The results showed that air-texturing could rise the relative entropy value from 0.3 to 1.45 while the disordering degree 1.28 to 4.25;and further differential shrinking would increase the relative entropy value to 1.65,as well the disordering degree to around 5.00.The increased disordering degree of the filament′ fragments led to the forming and enlarging of the disordered structure and entanglement structure,as shown by the rapid increase of bending stiffness and worse handle of ATY;and by multi-texturing the entanglement structure might be adjusted and bending stiffness might be lowered.