Components of a plastic extruder
The extrusion system includes a screw, a barrel, a hopper, a machine head and a mold. The plastic is plasticized into a uniform melt through the extrusion system, and the pressure is established during the process, and the screw is continuously extruded from the machine head.
1. The screw is the main part of the plastic extruder. It is directly related to the application range and production efficiency of the extruder. It is made of high-strength and corrosion-resistant alloy steel.
2. The barrel is a metal cylinder, generally made of heat-resistant, high compressive strength, strong wear-resistant, corrosion-resistant alloy steel or composite steel pipe lined with alloy steel.
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 to the molding system.
Generally, the length of the barrel is 15 to 30 times its diameter, so that the plastic can be fully heated and plasticized as a principle.
3. A cut-off device is installed at the bottom of the hopper to adjust and cut off the material flow. The side of the hopper is equipped with a viewing hole and a calibration metering device.
4. Machine head and mold: The machine head is composed of an alloy steel inner sleeve and a carbon steel outer sleeve, and a forming mold is installed inside the machine head. The function of the machine head is to transform the rotating plastic melt into a parallel linear motion, evenly and stably introduce it into the mold sleeve, and give the plastic the necessary molding pressure.
The plastic is plasticized and compacted in the machine barrel, and flows into the molding mold of the machine head through the porous filter plate along a certain flow channel through the neck of the machine head. A continuous dense tubular covering is formed around the core wire.
In order to ensure that the plastic flow path in the machine head is reasonable and eliminate the dead angle of accumulated plastic, a shunt sleeve is often installed. In order to eliminate pressure fluctuations during plastic extrusion, a pressure equalizing ring is also installed.
There is also a mold correction and adjustment device on the machine head, which is convenient for adjusting and correcting the concentricity of the mold core and mold sleeve.
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