Extrusion blow molding refers to the process of continuously extruding plastic melt through a die at a specific temperature and shear force, blowing it up with compressed air, cooling it with a wind ring, and then obtaining a double-fold plastic film by variable-frequency traction. This machine is mainly used for testing the feasibility of blowing film for polymer materials, as well as the gel status within the material, the dispersibility of colored pigments, controlled mixed materials, and the dispersibility of the extruded material.