CROSS-SECTIONAL STRUCTURE OF COMPOSITE YARNS

This work investigates the effect of spinning conditions such as trave ller, twist multiplier, and front top roller pressure and hardness on the cross-sectional structure of 19.7 tex T/R composite yarns. A trave ller of #1/0, a TM Of 2.8, and a front top roller pressure of 18 kg an d hardness of 70 degrees are the optimum spinning conditions. This com bination results in the best mixing of spread polyester filaments and drafting rayon fibers in the nip of the front rollers, arranged in the best dispersion to form a T/R composite yam with better quality and g ood blend uniformity. The results reveal that the 61.5% asymmetrically sided type is the predominant cross-sectional structure of T/R compos ite yams. However, the fraction of the uniform distribution type incre ases from 10.0 to 24.5%, indicating that the blend uniformity of T/R c omposite yarns improves remarkably.