The amount of twist is an important indicator to measure the performance of the yarn, which is generally expressed by twist. Twist refers to the number of twists per unit length of the yarn. The unit length varies with the type of yarn. Twist affects the strength, rigidity, flexibility, elasticity, shrinkage and other indicators of the yarn.
As the twist of the yarn increases, its strength increases, but the twist cannot exceed a certain value, otherwise its strength decreases. The softness, elasticity, and shrinkage of the yarn are also closely related to the twist.
Generally, under the premise of meeting the strength requirements, the smaller the yarn twist, the better, because the increase in the twist will make the yarn feel harder, decrease the elasticity, and increase the shrinkage rate.
In addition, the twist also affects the volume, weight and diameter of the yarn, and the twisting effect increases the tightness of the yarn. Within a certain range, the volume weight of the yarn increases with the increase of the twist, and the diameter of the yarn decreases with the increase of the twist, so that the coverage and comfort of the fabric will change.
In short, yarn twist should be selected according to different fabric uses. If the warp yarn needs to have higher strength, the twist should be larger; the knitting yarns need to be soft, and the twist should be smaller; for woven and knitted pile fabrics, the twist should be smaller to facilitate raising; Crepe fabrics are required to have the characteristics of smoothness, stiffness and coolness, and the twist of the yarn should be larger.
