+86 18030169616
allen@crtopmachine.com
Main components of plastic extruders:
- Feeding: The part of the machine that feeds plastic raw materials into the overflow system, usually including a hopper.
- Screw: The core component, the screw pushes the plastic raw materials to the mold by rotating, while heating the plastic.
- Heating system: Includes heating coils or heaters to melt plastic.
- Mold (counter-mold): Plastic is formed into the desired shape through the mold, and the shape of the mold determines the shape of the finished product.
- System: The colliding plastic is cooled in the cooling system to maintain the molded shape.
- Drive system: Provides power for the screw rotation, usually driven by an electric motor.
Working principle:
Plastic or powder enters the screw of the screw machine through the feeding system.
The hardness generated by the rotation of the screw and the action of the heating system gradually melt the plastic.
The molten plastic is extruded through the mold to form continuous plastic profiles, pipes, plates, etc.
The docked plastic is cooled and solidified through the cooling system to become the final product.
Common applications:- Plastic pipes: such as PVC pipes, PE pipes, etc.
- Plastic sheets: used in construction, advertising and other industries.
- Plastic film: used for packaging materials.
- Plastic profiles: such as window frames, door frames and other building materials.
Plastic screw machines have many types according to processing materials, finished product shapes, production requirements, etc., such as single screw machines, twin screw machines, etc. On the whole, as extruder units, twin screw extruder units and single screw extruder units are composed of two major parts: the main machine and the auxiliary machine.
Single screw extruder
Single screw extruder is generally composed of motor, transmission mechanism, barrel and heating device, screw, die, mouth, machine base, etc. In order to adjust the speed and set value of the screw according to the processing requirements, as well as adjust the heating temperature, die pressure and working procedures of each section of the extruder. In addition to the extruder, its auxiliary devices also include the shaping die, cooling device, traction device, cutting mechanism, thickness or roundness control device of the extruded product. Single screw extruder is a commonly used extrusion processing equipment and the most basic extrusion equipment.Twin screw extruder
Twin screw extruder is a meshing screw, while single screw extruder has only one screw. It has high productivity, can achieve a high extrusion rate, and is suitable for large-scale continuous production. This equipment is suitable for processing high viscosity, high temperature, high strength or high specific gravity plastics, such as rubber, silicone, PA, PC, etc. Twin screw extruders are generally more expensive due to their complex structure, and maintenance and operation are also more difficult. Scope of application. It has broad application prospects in the fields of corrosion resistance, engineering plastics, cables, functional composite materials, etc.
Nowadays, plastic extruders (main machines) can be matched with a variety of plastic molding auxiliary machines to meet different production needs. Whether it is a pipe production line, a film production line, a plastic production line, a monofilament production line, a flat wire production line, or a strapping production line, a mesh production line, a plate (sheet) production line, a profile production line, a cable coating production line, or even more complex production lines such as plastic modification and plastic recycling, they can all be led by plastic extruders (main machines).
