Polyester fiber is robust and durable, wrinkle-resistant, and lint-free, primarily used in clothing and interior decoration. Its advantages include excellent wrinkle and shape retention, as well as high strength and elasticity recovery capabilities.

Polyester fibers are synthetic fibers composed of polyester linear macromolecules formed by condensation of diols with dicarboxylic acids or ω-hydroxy acids, among others. In recent years, extensive research has been conducted on polyester fibers, but there are not many industrialized types. Currently, the polyester fibers produced on a large scale are derived from polyethylene glycol terephthalate (PET), which can also be referred to as PET fibers by their raw material's English abbreviation, or as Dacron in China. Polyester fibers were industrialized later among the three major synthetic fibers (polyester, nylon, and polyacrylonitrile), but they have developed rapidly. In 1960, the output of polyester fibers exceeded that of polyacrylonitrile fibers, and in 1972, it surpassed nylon fibers, becoming one of the major categories of chemical fibers. Specific types of polyester fibers include polyethylene terephthalate (PET) fibers, polybutylene terephthalate (PBT) fibers, polypropylene terephthalate (PPT) fibers, poly(p-terephthalate-1,4-cyclohexanedimethanol) fibers, poly-2,6-naphthalenedicarboxylic acid ethylene glycol (PAN) fibers, and various modified polyester-based fibers. To date, over 90% of polyester fibers are PET fibers, so the term "polyester fibers" generally refers to PET fibers.