Optimization of spinning parameters influencing the tensile properties of polyester/cotton vortex yarn

The influence of vortex spinning parameters on the tensile properties of polyester/cotton vortex yarn has been studied. Polyester/cotton yarn of 50:50 blend ratio have been produced in two different counts (Ne 20s and Ne 40s) each with four different spinning parameters (delivery speed, spindle size, feed ratio and nozzle pressure). Experiments are designed with the aid of response surface method. Accordingly different samples are produced with three levels of each parameter. The tenacity and elongation-at-break have been evaluated from the samples produced with these combinations. It is found that the tenacity of coarser count vortex yarn is influenced by feed ratio and the medium count vortex yarn is influenced by all the spinning parameters considered for this study. Elongation-at-break of coarser count vortex yarn is influenced by the feed ratio and nozzle pressure while that of the medium count vortex yarn is influenced by the spindle size, feed ratio and nozzle pressure. The interactions of spinning parameters have significant influence on the tenacity and elongation-at-break of medium count vortex yarn. On the other hand the interactions have significant influence on the coarser count vortex yarn elongation-at-break, but they do not have any influence on its tenacity.