The main unit of a plastic extruder is the extruder itself, which consists of an extrusion system, a drive system, and a heating and cooling system.
Extrusion System
The extrusion system comprises a screw, barrel, hopper, die head, and die. Within this system, the plastic is plasticized into a uniform melt and, under the pressure generated during this process, is continuously extruded through the die head by the screw.
Drive System
The function of the drive system is to power the screw, providing the torque and rotational speed required during the extrusion process. It typically consists of an electric motor, a reducer, and bearings.
Assuming a fundamentally identical structural design, the manufacturing cost of the reducer is roughly proportional to its physical dimensions and weight. This is because a larger size and weight for the reducer imply a greater consumption of materials during manufacturing; furthermore, the bearings utilized must also be larger, thereby increasing production costs.
Heating and Cooling Devices
Heating and cooling are essential prerequisites for the successful execution of the plastic extrusion process.
