What is the mechanism of action of twin-screw extruder?

Of course the role of the screw in a twin-screw extruder is very large. As I'm sure you know the screw does not move in an axial direction, although near the circumference it may turn laterally and rapidly. Therefore, the axial force on the screw is balanced, and if it exerts a large forward thrust on the plastic melt then it also exerts an equal backward thrust on an object. So the screw is very important for a twin-screw extruder, especially the pressure at the end is important. So what are the specific aspects of this pressure of the screw? This pressure reflects the resistance of everything downstream of the screw: filters and contamination zappers, adapter tubes, stationary agitators (if any) and the mold itself. It depends not only on the geometry of these components but also on the temperature in the system, which in turn affects resin viscosity and throughput speed. It is not dependent on screw design, except when it affects temperature, viscosity and throughput. For safety reasons, it is important to measure the temperature. If it is too high, the die and mold can explode and injure nearby personnel or machinery. Pressure is favorable for mixing, especially in the final zone (metering zone) of a single screw system. However, high pressures also mean that the motor has to output more energy and therefore the melt temperature is higher, which can set the pressure limit. In a twin-screw, the two screws [FSAGE] occlude each other which is a much more efficient agitator and therefore no pressure is required for this purpose. In the manufacture of hollow parts, such as tubes made in spider molds using brackets positioned against the core, high pressures must be generated within the mold to help recombine the separated logistics. Otherwise, the product along the weld line may be weaker and may be problematic in use.