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Polyester fiber is actually a synthesis of chemical fiber names. It is a synthetic fiber obtained by spinning polyester formed by polycondensation of organic dibasic acid and glycol. In China, we generally call it "polyester". The polyester filament mentioned in the title is actually a classification of polyester fiber (polyester), and polypropylene and polyester are two classifications, so the answer is obvious.
Polyester is the world's largest chemical fiber material, and its performance and application are unquestionable. However, polypropylene is a rising star, especially in this growing chemical fiber market. Traditional and original chemical fibers can no longer satisfy discerning consumers. As a new type of chemical fiber material, it can alleviate this tired chemical fiber market. Both have their own advantages and can only differ from person to person.