Yarn twist is a process in which one end of the yarn is fixed and twisted at the other end.Twisting can not only increase the cohesion between fibers, thereby forming a continuous yarn body with a certain strength from the fiber strips, but is also often used to increase the strength of the yarn or form fancy linear patterns of various shapes and properties.
Yarn Twist Level (The Amount of Yarn Twist)
Yarn twist level refers to the number of twists per unit length, expressed by T (twist/m, twist/10cm or twist/cm). Usually the unit of chemical fiber filament is m, the unit of short fiber yarn is 10cm, and the unit of silk is cm.
According to yarn twist level, yarn is divided into weak twist yarn, medium twist yarn and strong twist yarn. The degree of yarn twist has a great impact on the thickness, strength, wear resistance, feel and appearance of the fabric. For example, weak twist can enhance the strength and elasticity of yarns and fabrics, and change the luster of yarns and fabrics; strong twist can cause twisting and shrinkage of yarns, and create a crepe effect or high pattern effect on the surface of the fabric. It should be noted that what affects the degree of twisting of the yarn is the twist and linear density of the yarn. Therefore, the comparison of the degree of twist between yarns with different linear densities cannot be measured directly by the twist. It usually needs to be based on a specific linear density.
Twist Direction
According to the difference in the direction of twisting and rotation, the twist direction of the yarn is divided into two types: S twist and Z twist. The twist direction of the yarn also has a certain impact on the appearance and feel of the fabric. For example, if yarns with different twist directions are configured in the same system (warp or weft), the surface of the fabric can show a hidden stripe effect; if yarns with different twist directions are configured in the warp and weft directions, the fabric will have better luster and a thicker and softer feel; if the same system is configured in the warp and weft directions, The yarn with twist direction has thinner fabric, better body structure, higher strength, but weaker luster.
How To Analyze Yarn Twist ?
Analyzing the twist of a yarn is very easy. Just take a unit length of yarn and fix one end. Rotate the other end in the opposite direction according to the direction of yarn twist. The number of turns required to return the yarn to its untwisted state is the yarn twist level.You can also use professional yarn twist testing equipment to analyze.
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