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Introduction to the working process of twin screw extruder


The twin-screw extruder is an important device in plastic processing machinery. It is not only suitable for the extrusion molding and mixing processing of polymer materials. Its use has been expanded to food, feed, electrodes, explosives, building materials, Packaging, pulp, ceramics, etc. The high speed and high output of the extruder can enable investors to obtain greater output and high returns with lower input. However, the high speed of the extruder screw has also brought a series of difficulties that need to be overcome: if the residence time of the material in the screw is reduced, it will lead to uneven mixing and plasticization of the material, and the excessive shearing of the material may cause the material to heat up rapidly Decomposition and difficulty in controlling extrusion stability will cause fluctuations in the extrudate geometry. The accuracy of related auxiliary devices and control systems must be improved. The abrasion of screws and barrels requires high wear resistance and ultra-high wear resistance materials. Reducers With the bearing running at high speed, how to improve its life and other issues need to be solved.
On the whole, the research on the theory of twin-screw extruder is still in the initial stage, which is called "skills are more than science". The electrical automation control of the extruder's working process is also constantly developing. The traditional electrical control is It is realized by using stand-alone automation instruments, and has now developed into an electrical control system composed of touch screen, PLC, temperature control module, variable frequency speed regulation, etc. composed of human-machine interface technology, computer technology, and frequency conversion technology.