Main equipment of melting and spraying: feeding machine, single screw extruder, metering pump, melting and spraying die assembly, air compressor, air heater, receiving device, rewinding device. Melt jet nonwovens process is to use high speed hot air to draw the thin flow of polymer melt extruding from the spinneret hole of die head, from which the ultrafine fibers are formed and condensed on the setting screen or roller, and then become nonwovens by self-bonding. Melt spray cloth is the core material of the mask. Melt spray cloth is mainly made of polypropylene, and the fiber diameter can be up to 1 ~ 5 microns. With many voids, fluffy structure and good anti-fold ability, the unique capillary structure of ultrafine fiber increases the number and surface area of fiber per unit area, so that the melt spray cloth has good filtering, shielding, insulation and oil absorption. It can be used in air, liquid filtration materials, isolation materials, absorbing materials, mask materials, thermal insulation materials, oil-absorbing materials and wiping cloth and other fields.