Twisting is a necessary means of yarn formation. Twisting is to make the two sections of the yarn sliver rotate relatively. At this time, the fibers in the yarn sliver that were originally parallel to the yarn axis are inclined into helices. For staple fibers, twisting is mainly to improve the strength of the yarn. Twisting of filament can not only improve the strength of yarn, but also produce some effects. The amount of yarn twist and the combination of twist direction and twist degree of yarn in the fabric have a great impact on the appearance and performance of the product. Twist: The number of twists per unit length of yarn. The twist angle of the yarn is twisted for one turn. The more twists per unit length, the higher the twist.
Ttex － special twist (twist/10cm, cotton yarn)
Tm － metric twist (twist/m, combed wool yarn and chemical filament)
Te － British twist (twist/inch) 1 inch=2.54cm
Ttex=0.1Tm=3.937Te
