Plastic granulation production line basic information

The mainframe of the plastic granulator is an extruder consisting of an extrusion system, a transmission system and a heating and cooling system. Vigorously develop renewable resources and turn waste into treasure.

1. Extrusion system The extrusion system consists of a hopper and a machine head. The plastic is plasticized into a uniform melt through an extrusion system, and is continuously extruded by the screw under the pressure established in the process.

(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 and corrosion resistant alloy steel.

(2) Barrel: It is a metal cylinder, which is generally made of alloy steel with high heat resistance, high compressive strength, strong wear resistance and corrosion resistance or composite steel pipe lined with alloy steel. The barrel is matched with the screw to realize pulverization, softening, melting, plasticizing, venting and compacting of the plastic, and continuously and uniformly conveying the rubber to the molding system. The length of the general 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 the flow. The side of the hopper is equipped with a sight 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 jacket, and a molding die is arranged in the machine head. The function of the machine head is to transform the rotating plastic melt into a parallel linear motion, which is evenly and smoothly introduced into the mold sleeve and imparts the necessary molding pressure to the plastic. The plastic is plasticized and compacted in the barrel, and flows into the head forming mold through the neck of the neck through a porous filter plate along a certain flow path. The mold core sleeve is properly matched to form an annular gap with a decreasing cross section, so that the plastic melt is in the A continuous dense tubular coating is formed around the core. In order to ensure the plastic flow path in the machine head is reasonable and eliminate the dead angle of the accumulated plastic, a shunt sleeve is often placed. In order to eliminate the pressure fluctuation during plastic extrusion, a pressure equalizing ring is also provided. A mold correction and adjustment device is also mounted on the handpiece to facilitate adjustment and correction of the concentricity of the core and the mold sleeve. 2. Transmission system The function of the transmission system is to drive the screw. The torque and speed required by the supply screw during the extrusion process are usually composed of a motor, a reducer and a bearing.

3. Heating and cooling device Heating and cooling are necessary conditions for the plastic extrusion process.

(1) In 2013, the extruder usually used electric heating, which was divided into electric resistance heating and induction heating. The heating piece was installed in the fuselage, the neck and the machine head. The heating device heats the plastic in the cylinder from the outside to raise the temperature to achieve the temperature required for the process operation.