In the second-hand plastic extruder equipment, the second-hand plastic extruder is usually referred to as the main machine, and the matching follow-up equipment plastic extrusion molding machine is referred to as the auxiliary machine. After more than 100 years of development, the second-hand plastic extruder has changed from the original single screw to a variety of models, such as twin screw, multi-screw and even no screw. Second-hand plastic extruder (host machine) can be used with various plastic molding auxiliary machines, such as pipes, films, fixed materials, monofilament, flat wire, packing belt, extrusion net, plates (sheets), profiles, granulation, cable coating, etc. Supporting, forming a variety of plastic extruder molding production lines, can produce a variety of plastic products. Therefore, now or in the future, the second-hand plastic extruder molding machinery is widely used in the plastic processing industry. The main body of the second-hand plastic extruder is the extruder, which is composed of an extrusion system, a transmission system and a heating and cooling system.
Extrusion system: The extrusion system includes screw, barrel, hopper, mold and mold. The plastic is plasticized into a uniform melt through the extrusion system, and is continuously extruded through the screw under the pressure established in the process. Drive system: the drive system is used to drive screws. The torque and speed required by the screw during extrusion are usually composed of motor, reducer and bearing. Heating and cooling device: heating and cooling are necessary conditions for the process of plastic extruder. The extruder usually uses electric heating, which is divided into resistance heating and induction heating. The heating plate is installed on the body, neck and head. The heating device heats the plastic in the cylinder from the outside to warm it to reach the temperature required for process operation.