Nylon is a synthetic fiber that appears in the world. There is a CO-, -NH- group in the molecule of nylon thread, which can form hydrogen bonds between molecules or molecules, and can also be combined with other molecules, so the moisture absorption capacity of nylon is relatively high. good, and can form a better crystalline structure. Polyester low elastic yarn is a type of textured yarn of nylon chemical fiber. It is made of polyester chip (PET) as raw material, and polyester pre-oriented yarn (POY) is spun at high speed, and then processed by drafting and false twisting. It has the characteristics of short process, high efficiency and good quality.

Polyester low elastic yarn has the characteristics of high breaking strength and elastic modulus of general polyester, excellent heat setting, good resilience, heat resistance, light resistance, strong corrosion resistance, easy washing and quick drying, etc. It also has bulky properties. High performance, good heat insulation, soft feel, soft luster and so on. Polyester low elastic yarn is an ideal raw material for knitting (weft knitting, warp knitting) or weaving processing, suitable for making clothing fabrics (such as suits, shirts), bedding (such as quilts, bedspreads, mosquito nets) and decorative items (such as curtain fabrics) , sofa release, wall cloth, car interior decoration cloth) and so on. Low elastic yarn also has a sewing function, and overlocking is also called overlocking. This process is required for all pieces of clothing. Since the main purpose of the stitching is to keep the yarn of the piece from falling apart, the strength of the stitching thread is not high.

In order to save costs, the overlock thread is generally made of polyester network yarn without twisting, and its strength is lower than that of sewing thread. The difference between it and ordinary sewing thread is that the overhang thread is made of polyester filament without twisting, while the sewing thread is made of polyester staple fiber and twisted.