Polyester yarn refers to yarn spun from polyester as raw material. Polyester is a type of polymer fiber made by spinning, mostly referring to fibers produced from ethylene terephthalate as raw material. According to the English name of its raw material, "polyethylene terephthalate" is abbreviated as "PET" fiber. In our country, it is commonly known as polyester. The commonly referred to "yarn" actually refers to the collective term for "yarn" and "thread". In the field of clothing materials science, "yarn" is defined as follows: "yarn" is a slender object composed of many short fibers or long fibers arranged in an approximately parallel state, twisted and rotated along the axis to form a certain strength and thread density; And 'thread' is a strand of yarn made by twisting two or more single yarns together. Yarn is a fine thread made by elongating, twisting, and spinning fibers such as cotton, wool, hemp, and chemical fibers (usually used as raw materials for weaving), and then twisting them into multiple strands of fine threads using materials such as cotton, linen, silk, and wool. It is called thread.

Polyester yarn is a synthetic fiber, scientifically known as polyethylene terephthalate, also known as polyester in English. Polyester yarn is a type of raw material for weaving, and its characteristics include almost no moisture absorption (with a moisture regain of only 0.4%, while cotton yarn has a moisture regain of 8.5%). Therefore, the woven fabric is easy to clean, quickly dries, and has the characteristics of being firm, firm, and not easily wrinkled. However, the comfort of polyester yarn is relatively poor. Polyester yarn can be classified according to different methods, including pure cotton yarn, purified fiber yarn, cotton blended yarn, wool blended yarn, irregular yarn, etc. In addition, according to different spinning techniques, it can also be divided into combed yarn, combed yarn, peach wool yarn, etc. ‌

Polyester is a synthetic fiber, and its trade name is polyester fiber. It is a fiber forming polymer, polyethylene terephthalate (PET), made from purified terephthalic acid (PTA) or dimethyl terephthalate (DMT) and ethylene glycol (EG) through esterification, ester exchange and condensation reactions, and then spun and processed into fibers