First of all, the twin-screw extruder has the extruder principle of the single-screw extruder: solid conveying, melting, pressurization and pumping, mixing, stripping and devolatilization, but it is not simply the case. The research on twin-screw extrusion theory started late, coupled with its many types, complex screw geometry, and complex extrusion process, which brought many difficulties to the research. On the whole, the research on twin-screw extrusion theory is still In the initial stage, this is the so-called “more skill than science”. From the research of its extrusion process, it is roughly divided into three links:

  1. The change of the physical state of the polymer in the extrusion process, the principle of conveying solid melt The truth and laws of conveying and exhausting are established, and a mathematical and physical model is established to guide the design of the twin-screw extruder and the optimization of the extrusion process.
  2. It is necessary to clarify the extrusion process of two or more polymers and materials
  3. As a twin-screw extruder, the reaction process, speed, performance and screw configuration during extrusion reaction molding. The intrinsic link between operating conditions was modeled and used to guide reactive molding extrusion.