Yarn is a continuous thread-like object made from various textile fibers, which is thin and soft, and has the basic properties required for textile processing and final product use. Yarn is mainly used for weaving woven fabrics, knitted fabrics, braided fabrics and some non-woven fabrics, and a small part directly exists in the form of threaded textiles, such as various sewing threads, plush threads, embroidery threads, threads and other miscellaneous threads.