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Twist of the yarn
- Feb 28, 2018 -

Twist of the yarn: Twisting is one of the purposes of spinning, the number of twisting is an important indicator of the performance of the yarn, generally with twist. Twist refers to the number of twists in the length of the yarn (that is, the number of spirals). The unit length varies with the type of yarn. Twist affects the yarn strength, rigidity, elasticity, shrinkage and other indicators. With the increase of yarn twist, its strength is increased, but the twist can not exceed a certain value, otherwise its strength will decline, which is called the critical twist of the yarn. The critical twist of yarns of different raw materials is not the same.

The degree of softness, elasticity and shrinkage of yarns are also closely related to twist. Generally, in order to meet the strong requirements of the premise, the yarn twist smaller the better, because the increase in twist will make the yarn feel hard, elastic drop, shrinkage rate increases, this is the filament yarn generally as far as possible without twisting or less twisting. In addition, twist on the volume weight and diameter of the yarn also have influence, the twisting effect of the yarn tightness increased. In a certain range, the volume weight of the yarn increases with the increase of twist, and the diameter of the yarn decreases with the increase of twist, which changes the cover and comfort of the fabric.

In a word, yarn twist should be selected according to different fabric uses. such as the warp need to have a higher intensity, twist should be larger; weft and knitting yarn need to be soft, twist should be smaller; woven and knitted fabric yarn, twist should be smaller, in order to facilitate the start of the velvet, thin crepe fabrics, requirements with slippery, very, cool characteristics, the yarn twist should be larger.