The working mechanism of a screw extruder relies on the pressure and shear force generated by the rotation of the screw, which enables the material to be fully plasticized and uniformly mixed, and formed through a die; So sometimes a single extruder can simultaneously complete a series of processes such as mixing, plasticizing, and molding, enabling continuous production. In addition, the working mechanism of the plunger extruder mainly relies on the plunger pressure to first extrude the pre plasticized material from the die to achieve the molding effect. After the material in the material cylinder is extruded, the plunger will retract and wait until a new round of plasticizing material is added before proceeding to the next round of operation. This production process belongs to discontinuous production, and the material cannot be fully stirred and mixed. In addition, pre plasticization is required in this production process. Therefore, this method is not commonly used in actual production and can only be applied to plastics with extremely poor fluidity or high viscosity, such as nitrocellulose plastics, for molding and processing of plastic products.