The main body of the plastic extruder is an extruder, which consists of an extrusion system, a transmission system and a heating and cooling system.
The extrusion system includes a screw, barrel, hopper, die, and die. The plastic is plasticized into a uniform melt through the extrusion system, and under the pressure established in this process, the screw is continuously extruded from the die.
(1) Screw: It is the most important part of the extruder. It is directly related to the application range and productivity of the extruder. It is made of high-strength corrosion-resistant alloy steel.
(2) Barrel: It is a metal cylinder, generally made of alloy steel or composite steel pipe lined with alloy steel lined with heat resistance, high compressive strength, strong wear resistance and corrosion resistance. The barrel cooperates with the screw to realize the crushing, softening, melting, plasticizing, exhausting and compacting of the plastic, and continuously and uniformly transport the rubber material to the molding system. The length of the general barrel is 15~30 times its diameter, so that the plastic is fully heated and fully plasticized.
(3) Hopper: The bottom of the hopper is equipped with a cutting device to adjust and cut off the material flow, and the side of the hopper is equipped with a sight hole and a calibration metering device.
Advantages: Single screw extruder is simple in design and cheap in price, so it is widely used.