Basic principle of twin screw extruder:

Twin screw extruder has the basic extrusion principle of single screw extruder: solid conveying, melt pressurization and pumping, mixing stripping and evaporation, but is not limited to this. The development of twin-screw extrusion theory is relatively late. In addition, there are many kinds of twin-screw extrusion, the screw shape is disordered, and the extrusion process is disordered, which brings many difficulties to the research.

Generally speaking, the research on twin-screw extrusion theory is still in the development stage, which is called "technology is more than science". From the perspective of the whole extrusion process, there are about three parts: the change rules of polymer state in the extrusion process, the basic principle of transportation, the transportation of solid melt, the exhaust phase and the law. A mathematical and physical model is established to guide the planning of twin-screw extruder and the optimization of extrusion system process.

The future research directions of twin-screw extruder are as follows:

1. The physical and mathematical models of twin-screw extruder were established to guide the design of twin-screw extruder and the optimization of extrusion process.

2. It is necessary to understand the relationship between the real state change, mixing morphology, structure change, mixing and characteristics of two or more polymers and materials in the whole extrusion process.

3. As a twin-screw extruder, the internal relationship between the whole reaction process, speed and characteristics of extrusion reaction molding and the screw structure and operating conditions is established. It can be extruded through reaction molding.