Since the birth of the screw extruder, after nearly a hundred years of development, it has developed from a common screw extruder to a new screw extruder. Despite the wide variety of new screw extruders, the plastic extrusion mechanism is basically the same.
The extrusion process of the traditional screw plastic extruder is realized by external heating of the barrel, solid material, and barrel, screw friction and melt shear force. “Coefficient of friction” and “friction”, “viscosity” and “shear stress” are the main factors affecting the performance of traditional screw extruders. Because the factors affecting “friction” and “viscosity” are very complicated, traditional screw extrusion The extrusion process is an unsteady state that is difficult to control and is particularly prominent for some heat-sensitive plastics with poor thermal stability and high viscosity.
Since the 1960s, scholars from all over the world have done a lot of research on the mechanism of screw extrusion, and have made remarkable achievements, but because their research is mostly limited to the traditional plastic extrusion mechanism, mechanical structure, and energy conversion, Has not been able to achieve a major breakthrough. A series of shortcomings such as large volume, high energy consumption, high noise, and difficult product quality has not been fundamentally solved in the conventional screw extruder.
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