The production line of melt blown nonwovens with mutual benefit and win-win situation is one of the fastest developing nonwovens production lines. It is known as one-step polymer production process with short process in foreign countries. Application in the field of health: the dust-proof mouth made of melt spray cloth has small respiratory resistance, is not stuffy, and has high dust-proof efficiency. It is widely used in hospitals, food processing, mines and other workplaces requiring dust-proof and bacteria proof products. Melt blown cloth, commonly known as the "heart" of the mask, is the filter layer in the middle of the mask, which can filter and prevent the spread of germs. Melt blown cloth is a kind of film made of polypropylene with high melt index and many interlaced fibers in random direction. The diameter of the fiber ranges from 0.5 to 10 microns, and the diameter of the fiber is about one thirtieth of that of the hair.