Basic knowledge of twin screw extruder

First, the twin-screw extruder has the extruder principle of the single-screw extruder: solid conveying, melting, pressurization and pumping, mixed steam stripping and devolatilization, but it is not simply the case. The study of twin-screw extrusion theory started late, coupled with its many types, complicated screw geometry, and complicated extrusion process, which brought many difficulties to the study. On the whole, the study of twin-screw extrusion theory is still in the initial stage, which is the so-called 'skills more than science'. From the study of its extrusion process, there are roughly three links: 1. The law of polymer state change during the extrusion process, the principle of conveying solids, the conveying of melts, the truth and laws of exhaust, and the establishment of mathematical and physical The model is used to guide the design of the twin screw extruder and the optimization of the extrusion process. 2. It is necessary to clarify the actual state of the change of two or more polymers and materials during the extrusion process, the mixing form, the process of structural change, and the relationship between the subsequent mixture and the performance. 3. As a twin-screw extruder, the internal relationship between the reaction process, speed, performance and screw configuration and operating conditions during extrusion reaction molding is established to establish a model to guide the reaction molding extrusion. The development of twin-screw extruder: It was first successfully developed in Italy in the 1930s, and it developed rapidly in the late 1960s and early 1970s. The counter-rotating twin-screw is developed with the development of RPVC products, and the contract is developed with the modification of polymers. The research of twin-screw extrusion theory cannot adapt to the development of applications, and a consensus has been formed around the world. Become a research hotspot and coordinate global agricultural policies.
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