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Extrusion systems for plastic extruders

by:TENGDA     2023-01-08
​ The extrusion system of a plastic extruder includes a screw, a barrel, a hopper, a die, and a mold. The plastic is plasticized into a uniform melt through the extrusion system, and under the pressure established in this process, it is continuously melted by the screw. extruder head.

⑴Screw: It is the most important part of the plastic extruder. It is directly related to the application range and productivity of the plastic extruder. It is made of high-strength and corrosion-resistant alloy steel.

⑵Cylinder: It 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) Hopper: 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.

⑷ Machine head and mold: The machine head is composed of an alloy steel inner sleeve and a carbon steel outer sleeve. There is a forming mold inside the machine head. Set, 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 splitter sleeve is often installed. In order to eliminate pressure fluctuations in the plastic extruder, 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.

According to the angle between the material flow direction of the head and the center line of the screw, the plastic extruder divides the head into an oblique head (included angle 120o) and a right-angle head. The shell of the machine head is fixed on the machine body with bolts. The mold inside the machine head has a core seat and is fixed on the inlet port of the machine head with a nut. The front of the core seat is equipped with a core, the core and the core seat There is a hole in the center for passing the core wire, and a pressure equalizing ring is installed at the front of the machine head for equalizing the pressure. The extrusion molding part is composed of a die sleeve seat and a die sleeve. The position of the die sleeve can be adjusted by the bolt through the support. , to adjust the relative position of the mold sleeve to the mold core, so as to adjust the uniformity of the thickness of the extruded cladding, and the outside of the head is equipped with a heating device and a temperature measuring device.

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