Extrusion blown film is a process in which the plastic melt is continuously extruded through the mold mouth through a single screw conveyor at the processing temperature of the raw material, under the action of a certain shear force. It is then expanded by compressed air, cooled by a wind ring, and pulled by a frequency converter to obtain a double diameter plastic film. Mainly used to detect the feasibility of blowing polymer materials and the gum condition inside the material, as well as the dispersion of colored dispersions, control mixtures, and extrudates.