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Working principle of twin screw extruder

by:TENGDA     2023-01-29
​ First of all, the twin-screw extruder has the extruder principle of the single-screw extruder: solid conveying, melting, boosting and pumping, mixing, stripping and devolatilization, but it is not simply the case. The research on twin-screw extruder theory started late, coupled with its many types, complicated screw geometry, and complicated extrusion process, this brought many difficulties to the research.

On the whole, the research on twin-screw extruder theory is still in the initial stage, which is the so-called 'skills are more than science'.

From the research on its extrusion process, it can be roughly divided into three links:

1. The change law of the polymer state during the extrusion process, the principle of conveying, the truth and law of the conveying and exhausting of the solid melt, and the establishment of a mathematical physical model, which is used to guide the design of the twin-screw extruder and the extrusion process. optimization.

2. It is necessary to find out the real state 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 final mixture and its performance.

3. As a twin-screw extruder, the internal relationship between the reaction process, speed, performance, screw configuration and operating conditions during extrusion reaction molding is established to guide 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. With the development of polymer modification, the theoretical research on twin-screw extruders cannot adapt to the development of applications, and a consensus has been formed in the world, and it has become a research hotspot.

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