Polyester fiber, commonly known as "Dacron," is a synthetic fiber derived from the polymerization of organic dicarboxylic acids and diols, known as PET fiber, and belongs to high molecular compounds. Invented in 1941, it is a major variety of synthetic fibers. The advantages of polyester fiber include excellent wrinkle resistance and shape retention, high strength, and elasticity recovery. It is durable, wrinkle-free, and does not pill. Polyester fiber boasts a range of excellent properties such as high tensile strength and modulus of elasticity, moderate resilience, excellent heat-setting effects, good heat and light resistance. The melting point of polyester fiber is around 255°C, with a glass transition temperature of about 70°C, maintaining stable shape under a wide range of application conditions. The fabric is washable and wearable. Additionally, it has resistance to organic solvents, detergents, soaps, bleaches, and oxidants, as well as good corrosion resistance, stable against weak acids and alkalis, thus finding extensive use in both clothing 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 the advancement of technologies such as chemical engineering, machinery, and electronic self-control in recent years, the production of raw materials, fiber formation, and processing have gradually become shortening, continuous, automated, and high-speed, making polyester fiber a type of synthetic fiber with rapid development and high yield.