Plastic extrusion machine also belong to one of the types of plastic machinery. Extruder according to the direction of the flow direction and the angle between the center line of the screw, the nose can be divided into right angle head and the angle of the nose, etc.. Head of the shell is bolted to the fixed on top of the fuselage, the head inside the module containing the mold core seat, then with the nuts. The fixed in the nose inlet port, internal mold core seat is also provided with a mold core and mold core and the mold core seat center holes are arranged in and its role for the wire. The extrusion process can be divided into two types according to the different types of compression methods, which can be divided into continuous extrusion and batch extrusion. The equipment used in the former is a screw extruder, the latter is a plunger extruder. The screw type extruder can be roughly classified into a single screw extruder and a multi screw extruder by a single screw extruder.

Screw type extrusion machine work mechanism is rely on the screw rotation generated by pressure and shearing force which makes the materials can be fully plasticizing and mixing, the forming die; so sometimes use a extruder can also complete mixing, plasticizing and forming a series of process, thus the continuous production. In addition, the working mechanism of the plunger extruder is mainly by the aid of the plunger pressure, the prior plastic material from the extrusion die to achieve the effect of molding. Material in the material cylinder extrusion after the plunger will return to wait until after the addition of a new round of plasticized material then followed by a round of operation, the production process belongs to a discontinuous production, and the basic material not to fully stirred and mixed, in addition to produce the need for pre plasticizing, so in the actual production often do not often use this method, can only apply to illiquid or plastic viscosity is very large, like cellulose nitrate plastic, the plastic products forming.