Commonly used sewing thread models are 202, 203, 402, 403, 602, 603 and so on. It is usually formed by twisting several strands of yarn side by side. The 20, 40, 60, etc. in front of the sewing thread model all refer to the yarn count. The yarn count can be simply understood as the thickness of the yarn. The higher the count, the better the yarn. Thin; 2 and 3 behind the model mean that the sewing thread is made of several strands of yarn and twisted together. For example: 603 is made of 3 strands of 60 yarns twisted together. Therefore, the sewing thread twisted by the same number of strands, the higher the count, the thinner the thread and the lower the strength; while the sewing thread twisted by the same number of yarns, the more strands, the thicker the thread and the lower the strength. bigger. Comparison of line thickness: 203>202>403>402=603>602 1) Nylon thread (Nylon 6, Nylon 6.6) Nylon thread, also known as nylon thread and pearl thread, is made of continuous filament nylon fibers twisted together. It is smooth and soft, with an elongation rate of 20%-35%. It has good elasticity and emits white smoke when it burns. High wear resistance, good light resistance, mildew resistance, coloring degree of about 100 degrees, low temperature dyeing. It is widely used because of its high seam strength, durability, flat seam, and can meet the needs of a wide range of different sewing industrial products. (2) Tedolong Line Tedolong thread: also known as high-strength thread and polyester thread, it is made of continuous polyester high-strength and low-elongation yarns twisted together, with a temperature resistance of 130 degrees, high tensile force, low elongation, and no elasticity; Hard, burning black smoke, 130 degrees high temperature dyeing.