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What types of plastic extruders are there?

by:TENGDA     2023-01-02
​ Plastic extruders can be divided into single-screw extruders, twin-screw extruders and multi-screw extruders according to the number of screws. At present, the single-screw extruder is the most widely used, suitable for extrusion processing of general materials. The twin-screw extruder has less heat generated by friction, relatively uniform shearing of the material, large screw conveying capacity, relatively stable extrusion volume, long residence time of the material in the barrel, and uniform mixing.
The single-screw extruder occupies an important position both as a plasticizing and granulating machine or as a molding processing machine. In recent years, the single-screw extruder has made great progress.
The twin-screw extruder has good feeding characteristics, is suitable for powder processing, and has better mixing, exhaust, reaction and self-cleaning functions than the single-screw extruder, and is characterized by processing plastics with poor thermal stability and blending It also shows its superiority when feeding. On the basis of twin-screw extruders, in order to process blends with poor thermal stability more easily, multi-screw extruders have been developed, such as Guanghua plastic extruders.
1. According to the number of screws, it can be divided into single-screw extruder, twin-screw extruder and multi-screw extruder;
2. According to whether there is a screw in the extruder, it is divided into screw extruder and plunger extruder;
3. According to the operating speed of the screw:
Ordinary extruder: the speed is below 100r/min;
High-speed extruder: the speed is 100-300r/min;
Ultra-high-speed extruder: the speed is 300-1500r/min.
4. Classification according to the assembly structure of the extruder: there are integral extruders and separate extruders;
5. According to the spatial position of the screw in the extruder, it can be divided into horizontal extruder and vertical extruder;

6. According to whether the extruder is vented during processing, it can be divided into vented extruder and non-vented extruder.



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