According to the number of screw extruder, plastic extruder can be divided into single screw extruder, twin screw extruder and multi screw extruder. At present, the single screw extruder is the most widely used, and it is suitable for extrusion processing of general materials. Double screw extruder with shear transmission capacity due to the heat generated by friction, less material is relatively uniform, the screw extrusion amount is larger, more stable material, long stay in the barrel, mixed evenly.
Single screw extruder is an important part in the field of plastic granulation machine and molding machine. In recent years, the development of single screw extruder has been greatly improved.
Double screw extruder feeding characteristics, suitable for powder processing, and the ratio of single screw extruder has better mixing, exhaust, reaction and self-cleaning function, is characterized by poor thermal stability of plastic processing and blending material also shows its superiority. On the basis of twin screw extruder, in order to make it easier to process the mixture with poor thermal stability, a multi screw extruder was developed.
1, according to the number of screw, divided into single screw extruder, twin screw extruder and multi screw extruder;
2, according to whether there are screw extruder, divided into screw extruder and plunger extruder;
3, according to the operating speed of the screw:
Ordinary extruder: the speed below 100r/min;
High speed extruder: speed of 100 ~ 300r/min;
Ultra high speed extruder: speed of 300 ~ l500r/min.
4, according to the extruder assembly structure classification: there is an integral extruder and separate extruder;
5, according to the screw extruder in the space position, can be divided into horizontal extruder and vertical extruder;
6, according to the extruder in the process of exhaust, and can be divided into exhaust extruder and non exhaust extruder.