Extrusion system of plastic recycling machine

The extrusion system includes screw, barrel, hopper, die head, and mold. The plastic is plasticized into a uniform melt through the extrusion system and is continuously extruded out of the die head by the screw under the pressure established in this process.
(1) Screw of waste plastic recycling machine: It is the most important component of the extruder. It is directly related to the application range and productivity of the extruder. It is made of high-strength and corrosion-resistant alloy steel.
(2) Barrel of waste plastic recycling machine: It is a metal cylinder, generally made of heat-resistant, high-compression strength, strong, wear-resistant and corrosion-resistant alloy steel or composite steel pipe lined with alloy steel. The barrel and screw cooperate to realize the crushing, softening, melting, plasticizing, exhausting and compacting of plastics, and continuously and evenly 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 fully plasticized.
(3) Hopper of waste plastic recycling machine: A cut-off device is installed at the bottom of the hopper to adjust and cut off the material flow, and a sight hole and a calibration metering device are installed on the side of the hopper. Product
(4) Head and mold of waste plastic recycling machine: The head is composed of an alloy steel inner sleeve and a carbon steel outer sleeve, and a molding mold is installed in the head. The function of the head is to convert the rotating plastic melt into parallel linear motion, evenly and smoothly introduce it into the mold sleeve, and give the plastic the necessary molding pressure. The plastic is plasticized and compacted in the barrel, and flows into the head molding mold through the porous filter plate along a certain flow channel through the head neck. The mold core and the mold sleeve are properly matched to form an annular gap with a continuously decreasing cross-section, so that the plastic melt forms a continuous and dense tubular coating around the core line. In order to ensure the reasonable plastic flow channel in the head and eliminate the dead corners of accumulated plastic, a diversion sleeve is often installed. In order to eliminate pressure fluctuations during plastic extrusion, a pressure equalization ring is also set. The die head is also equipped with a device for mold correction and adjustment, which is convenient for adjusting and correcting the concentricity of the die core and die sleeve.
According to the angle between the die head material flow direction and the center line of the screw, the extruder divides the die head into an angled die head (angle 120o) and a right-angle die head. The shell of the die head is fixed to the body with bolts. The die inside the die head has a die core seat and is fixed to the die head inlet port with a nut. The die core is installed in front of the die core seat. There is a hole in the center of the die core and the die core seat for passing the core wire; a pressure equalizing ring is installed at the front of the die head for equalizing pressure; the extrusion molding part consists of a die sleeve seat and a die sleeve. The position of the die sleeve can be adjusted by bolts through the support to adjust the relative position of the die sleeve to the die core, so as to adjust the uniformity of the thickness of the extruded layer. A heating device and a temperature measuring device are installed on the outside of the die head.