Abstract: The phenomenon of entropy change was found during texturing, especially in course of air-jet texturing of the chemical filaments, further researches had proved that there were remarkable relationship between the texturing entropy change and the parameters of structure and property of the textured yarn. To find out the effects of parameters of texturing on the entropy change, a group of single factor experiments focus on representative air-jet texturing and differential shrinking parameters including filament and filaments size, the overfeeding rate in air-texturing and the differential shrinkage rate of the differential shrinkage filaments were designed. The testing results showed that, in term of a settled filament linear density, the entropy changing became bigger when the filaments linear density grew; on the contrary, if the filaments linear density was a constant, the entropy changing decline with the increasing of the filament linear density. The bigger overfeed could increase the entropy changing during the course of air texturing while the bigger differential shrinkage rate could bring a bigger entropy changing for the differential shrinkage filaments ATY.

Key words: air texured yarn, entropy change, linear density, overfeed rate, differential shrinkage rate