340-343An 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