Analysis on basic parameters of false-twist compact spinning

The false-twist compact spinning method was suggested to improve the quality of ring spun cotton yarn.A series of spinning experiments were conducted to investigate the influences of drafting systems,rotational speed ratio and rotational direction of the false twister on yarn evenness,hairiness index,breaking strength and breaking elongation.The results showed that the yarns produced on the double-apron drafting system have better quality than those produced on the simple three-roller drafting system.The rotational direction should be adjusted according to the twist direction of the roving.The twist direction of the roving used in the experiment is Z twist,so the rotational direction should be counterclockwise.The experiment results also indicated that the rotational speed ratio is governed by other spinning parameters.When the rotational direction of the false twister is counterclockwise,the optimum rotational speed ratio is 0.36.When the false twister runs clockwise,the rotational speed ratio should be higher to improve yarn quality.