The main body of the plastic recycling granulator is an extruder, which is composed of an extrusion system, a transmission system and a heating and cooling system.
Extrusion system The extrusion system includes a screw, barrel, hopper, die, and die. The plastic is plasticized into a uniform melt by the extrusion system, and is continuously extruded by the screw under the pressure established in this process. Nose.
(1) Screw: It is the most important part of the plastic recycling granulator extruder. It is directly related to the application range and productivity of the extruder and is made of high-strength corrosion-resistant alloy steel.
(2) Plastic recycling granulator 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 evenly transport the rubber material to the molding system. Generally, the length of the barrel is 15 to 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.
(4) The machine head and die: The machine head is composed of an alloy steel inner sleeve and a carbon steel outer sleeve, and a molding die is installed in the machine head. The function of the machine head is to transform the plastic melt in rotary motion into parallel linear motion, which is evenly and smoothly introduced into the mold sleeve and gives the plastic the necessary molding pressure.
The plastic is plasticized and compacted in the barrel of the plastic recycling granulator and flows into the nose forming mold through the neck of the nose through the porous filter plate along a certain flow channel. The core mold sleeve is 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 wire.
In order to ensure that the plastic flow channel in the machine head is reasonable and eliminate the dead corner of the accumulated plastic, a shunt sleeve is often arranged. In order to eliminate the pressure fluctuation during plastic extrusion, there are also pressure-equalizing rings. The machine head is also equipped with a mold correction and adjustment device, which is convenient for adjusting and correcting the concentricity of the mold core and the mold sleeve.
Recycled waste plastics must first be crushed into granules with a grinder, and then granulated after screening and cleaning. For waste plastic crushing, the model is generally 30HP or above, and it is also useful for small machines, depending on the materials recovered.
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