An investigation on the minimum twist of cohesion of ring and compact spun yarns

摘要

An instrument has been designed to determine the minimum twist of cohesion in yarns. The mechanical twist tester (based on untwist - retwist principle) has been used for finding out the initial twist per inch in the yarn. The number of turns that must be removed to break the yarn has been observed using the designed instrument. As it is useful in deciding the twist factor to be given to yarns, tests have been carried out on various types of treated and untreated yarns. It is observed that the treated yarns give better cohesion than untreated ones. Comparative studies on ring and compact yarns show that the compact yarn gives better cohesion.