2. Therefore, the weft direction uses polyester 16.7tex/36fx371 (island silk) + 7.6tex conventional polyester covered with double twist, and the warp direction uses 11.1tex polyester as the raw material for the development of suede products. The raw materials used by some domestic downstream enterprises are polyester sea island yarns purchased from South Korea's Huvis Company. There are 37 islands in the single fiber. After the sea part is dissolved, the single fiber is 0.05De. Has a powdery, soft feel, suede look. In order to ensure the stability of the quality of the finished cloth, domestic manufacturers are required to ensure that the raw materials are first-class products and the same batch number. The fiber-dissolving formula adopts the special high-temperature alkaline water (150℃, pH=13-14 water) process formula that matches the raw materials.