(3) PP pure polyester thread PP pure polyester thread, also known as SP thread, PP thread, is also made of polyester raw material with high strength and low elongation, with wool on the surface, temperature resistance of 130 degrees, high temperature dyeing. Polyester raw material is the most resistant to friction, dry cleaning, stonewashing, bleaching and other detergents among all materials. Its low elongation and low stretch rate ensure excellent seamability and prevent wrinkles and jumps. Needle. (4) Bondi line (glue line) Bondi threads are available in Nylon 6 and Nylon 6.6, which are made of continuous nylon filaments twisted together, and after bonding treatment, all strands of yarn are bonded together. Even if they are cut with scissors, they will never be will diverge. After being lubricated with high efficiency, it can be used for daily heavy sewing processes, such as leather, canvas products or sports shoes. The elongation is 20-28%, the wear resistance is better, the thread is not easy to break, and the surface is smooth like a ribbon. (5) Polyester fiber leather sewing thread Polyester fiber leather sewing thread, also known as special thread, is made of a high-quality high-strength polyester fiber filament twisted together. Compared with nylon thread or PP thread of the same level, it has stronger tensile force, soft material and low elongation. Durable, inelastic, bright and bright color, not fading, and has the characteristics of light resistance, heat resistance and wear resistance, it is most suitable for sewing various leather goods, women's shoes, artificial leather products, etc. (6) Mark Line The mark thread is double-twisted on the basis of PP pure polyester thread, and the twist direction has S and Z directions, that is, left twist and right twist. There are two ways to twist, one is to twist several strands together, the other is to twist 2 strands or 3 strands or 4 strands into a small strand first, and then use these small strands to form 3 strands, 4 strands, 5 strands, 6 strands are twisted together into a large strand. Common specifications are: 2x3, 3x3, 3x4, 3x5, 3x6, 4x3, 6x3. (7) Polyester core-spun wire Polyester core-spun thread is a sewing thread made of polyester filament as the core and covered with polyester staple fiber on the outside. Higher and more balanced strength, moderate toughness, tight stitching, excellent low shrinkage, good wear resistance, excellent corrosion resistance, antistatic properties, plus specially developed lubricating oil, used in delicate It is a perfect combination for sewing, and the operation with high requirements for seam strength.