Commonly used sewing thread: Sewing thread is used to sew all kinds of clothing, shoes, leather goods and other materials, and has dual functions of practicality and decoration. The quality of the sewing thread not only affects the sewing effect and processing cost of sewing thread, but also delays the customer's demand, so that the customer will lose confidence, which is likely to lose the customer source, so the quality is also very important when there is another customer source. The strength and heat resistance of polyester sewing thread, cotton thread and high-strength thread are very good, suitable for high-speed sewing and durable pressing, and the elasticity and wear resistance are poor. In addition to ordinary soft cotton threads, wax threads and wax threads that have been waxed have improved strength and wear resistance, which can reduce frictional resistance during sewing, and are suitable for hard fabrics, leather fabrics or clothes that need to be ironed at high temperature. Do sewing. The silk thread is soft in texture, the appearance of the yarn is plump and shiny, the strength is also improved, and the hand feels smooth. It is mostly used for sewing medium and high-grade cotton products. Sewing equipment coordination The lockstitch machine uses left-handed stitches, which can be twisted during sewing to maintain the strength of the stitches. Coordinated with the stitch form, the bag (interlock) sewing machine uses fine cotton thread, the sewing material is not easy to deform and wrinkle, and the chain stitch is beautiful and comfortable. Double stitches should use sutures with good extensibility. The crotch seam and shoulder seam should use firm stitching. Buttonhole stitches should be durable stitches.