Abstract: In order to illustrate the development and application of T400 fiber in knitting products, this paper analyzes the research status of T400 fiber. Starting from the spinning principle and structure of T400 fiber, the unique properties of T400 fiber, such as excellent elasticity, moisture absorption and quick-drying property are compared and analyzed. And then, the basic development ideas of T400 fiber in shirting fabric,sports fabric, suit fabric, jean fabric are summarized. In the end, the paper summarizes the cases of T400 fiber in the development and application of knitted products and introduces the related development and design methods, fabric technology, fabric style, machine parameters, etc., providing a reference for the summary and prospects of T400 fiber in the development and application of knitted products.

Key words: T400; bicomponent fiber; elastic fiber; PTT / PET; knitted products