Twist affects the strength, rigidity, flexibility and shrinkage of the yarn. With the increase of yarn twist, its strength is increased, but the twist can not exceed a certain value, otherwise its strength will decline, this certain value is called the critical twist of the yarn. The critical twist of yarns of different raw materials is not the same. Generally, under the premise of meeting the strong requirements, the smaller the yarn twist, the better, because the increase of twist will make the yarn feel harder, the elasticity decreases, and the shrinkage increases, which is also the reason why the filament yarn is generally not twisted or less twisted.
In addition, twist also has an effect on the volume weight and diameter of the yarn, and the twisting effect increases the tightness of the yarn. 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, so that the coverage and comfort of the fabric change.
Yarn twist should be selected according to the different use of the fabric.
The warp needs to have a higher strength, and the twist should be larger;
Weft and knitting yarn should be soft, and the twist should be small;
Yarn for weaving and knitting pile fabrics, the twist should be small to facilitate pile;
Thin and cool crepe fabrics require smooth, stiff and cool characteristics, and the twist of the yarn should be larger.
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