Polyester fiber, commonly known as "Dacron," is a synthetic fiber obtained by spinning a polymer made from organic dicarboxylic acids and diols. Abbreviated as PET fiber, it is a high molecular compound. Invented in 1941, it is one of the major types of synthetic fibers. Polyester fiber boasts excellent wrinkle resistance and shape retention, with high strength and elasticity recovery. It is durable, resists wrinkles, and does not pill. It has a range of superior properties, such as high tensile strength and modulus of elasticity, moderate resilience, excellent heat-setting effects, and good heat and light resistance. The melting point of polyester fiber is around 255°C, with a glass transition temperature of about 70°C. It maintains shape stability under a wide range of application conditions, offering washable wearability. Additionally, it exhibits resistance to organic solvents, detergents, soaps, bleaches, and oxidizers, and has good corrosion resistance, remaining stable against weak acids and alkalis. This makes it widely used in both apparel and industrial applications. The rapid development of the petrochemical industry has also provided a more abundant and inexpensive raw material for polyester fiber production. With advancements in chemical, mechanical, and electronic self-control technologies in recent years, the production of raw materials, fiber formation, and processing have gradually become short-range, continuous, automated, and high-speed. Polyester fiber has become a type of synthetic fiber with rapid development and high yield.