Silk light has the characteristics of good luster, smooth line, no elasticity, strong tensile force, firm coloring, and washing resistance. Because of its high brightness and good color, it is often used as a decorative thread on the surface of clothing to increase the beauty. Filament light generally uses high-strength and low-shrinkage FDY filaments (that is, fully drawn filaments) twisted into strands. Several strands have a certain twist direction (divided into Z direction and S direction) and winding tightness. After it is twisted, it changes the basic thread fiber structure. The twist is usually unevenly distributed on the whole yarn, so when the yarn is stretched to break, it will be found that not all fibers are broken on the broken section, but some fibers are broken, and the other part of the fibers slips off. , and the broken part of the fiber is not broken at the same time. This breaking performance and single yarn tenacity are closely related to the twist of the yarn. Therefore, the silk light will appear splitting phenomenon. Not only the silk thread, but also the twist of the sewing thread will change, which will cause twist transfer during the sewing process. Like silk with a smooth surface, it is easy to automatically twist or loose twist in front of the needle or before and after the force point. Thread problems can occur during sewing due to twisting. If it is twisted, it is conducive to the formation of stitches and can make up for the loss of upper thread strength; if the twist is loosened when the stitch loop is formed, it is easy for the hook tip of the rotary hook to catch one or two of the multiple strands of light. , so there is a split line, and if you continue to work, the line will be broken.​​

High-strength thread is a kind of sewing thread. The thread produced has a certain tensile force, strong tensile force, luster, high temperature resistance and high speed. It is mainly suitable for leather sewing, such as: shoe industry, bag industry, sofa industry Wait. High-strength thread is the most common leather sewing thread.​​

Strong thread is suitable for sewing all kinds of clothing materials, and has the dual function thread of utility and decoration. The quality of high strength not only affects the sewing effect and processing cost, but also affects the appearance quality of the finished product. Therefore, the general concept of high-strength thread formation, twist, the relationship between temperature resistance and strength, suture classification, characteristics and main uses, and selection of high-strength threads are introduced to facilitate enterprises to formulate standards for relevant tests. Determining the general concept of high-strength line formation

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