The most difficult to machine in a twin-screw extruder is a twin-screw, as shown in Figure 1. Because each of its screws has not only 4 to 6 segments of unequal thread, but also long. The two screws are turned to the left or right or in the same direction, and like the gear meshing, there is a high fit requirement. If it does not meet the requirements, the screw will be killed and the machine will be damaged during operation. Therefore, compared with the ordinary screw, it is not only difficult to add, but also has high requirements. Advanced foreign countries adopt
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