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What is the effect of twisting on the gloss and feel of the sewing thread?
- Apr 17, 2018 -

The gloss and feel of the sewing thread strands mainly depends on the degree of surface fiber tilt. The outer layer has large fiber defects, and the gloss is poor, and the hand feels hard. On the other hand, the outer layer fibers have a small enthalpy, so the gloss is good and the hand feels soft. Double-strand sewing thread is twisted in the reverse direction. When the ratio of the twist coefficient of the strand to the twist coefficient of the single yarn is equal to 0.707, the width of the outer layer is zero, that is, the fiber is parallel to the axis of the strand. At this time, the strand has excellent gloss and soft hand.

In the process design, the degree of twist less than the critical twist factor is generally adopted, and the production efficiency of the spinning frame is increased under the premise of ensuring the strength of the spun yarn. According to the effect of twisting on the properties of the sewing thread yarn and the requirements on the properties of the yarn, the twist factor is appropriately selected to be larger. The weft yarn has fewer steps and less tension. In order to stabilize the twist, the twist coefficient is selected to be smaller. Generally, the density of the warp thread is 10%-15% larger than that of the weft. Knitting yarns generally require softer, more stable twists, and smaller twist factors. The twist coefficient of the pile yarn should be smaller to facilitate the raising. The thin fabrics and knitted garment fabrics are required to be slippery, stiff, and cool, and are required to prevent pilling and pilling, and the twist factor can be appropriately selected to be larger. sewing thread Twist fabrics need to use strong twisted yarn. In addition, when the thickness of the spun yarn is different, the twist coefficient is also slightly different. The fine yarn has a larger twist coefficient than the coarse yarn. For strands, the use of reverse twisting is the ratio of the twist coefficient of the strands to the single yarn. The cotton fabric warp yarns generally use 1.2-1.4, the weft yarns use 1-1.2, and the knitted fabrics use cotton yarns 1.3-1.4; cotton. The felt has a cotton thread of 0.9-1.1; the combed hair strand uses 1.2-1.8; the wool thread uses 1.8-1.9. The twist factor of some common yarns is specified in the relevant standards.