Knitted articles are divided into two categories: weft-knitted and warp-knitted. In the weft knitted fabrics, each yarn in a loop in a loop column, a yarn formed by the coil configuration along the weft direction of the fabric; in the warp knitted fabrics, each yarn in each loop column only forms one or two loops, and then transferred to the next column and then form a loop, a yarn formed by the coil configuration along the warp direction of the fabric. Therefore, in weft knitted fabrics a yarn can produce weft knitted fabrics used in the main machines are: circular weft machines (single-sided circular weft machines, double-sided circular weft machines, sock machines, flat knitting machines, etc.) weft knitted fabrics common products are: underwear (such as sweatshirts, cotton sweater, wool underwear, etc.), wool sweater, hosiery, gloves, etc.. Yarns are fed from the warp direction, bent into loops and strung over each other to form the fabric. It is characterized by the fact that each yarn forms only one loop in a row, so that each row is formed by a number of yarns that are looped and interlocked. The main machines used in the production of warp knitting fabrics are: warp knitting machines (single needle bed warp knitting machines, double needle bed warp knitting machines), sewing machines, lace machines and so on. Warp knitting fabrics are common products: home and hotel decorative cloth (such as thick, thin curtain cloth), bedding (such as mosquito nets, bedspreads, Raschel blankets) and some industrial supplies and so on.