Study On Mixing Mechanism In New Conical Twin-Screw

Because of the particular geometry structure of the conical twin-screw extruder, it has been widely used in the plastic industry, especially in the processing of the UPVC, which is one of the most important plastic materials. But there were little paper issued in this filed. So it is significant to study its basic theory.In this study, a new conical screw with mixing elements is studied. On a basis of experiment and analysis on output, residence time, pressure, fluxing state, this study emphasizes on mixing mechanisms.First, building a three-dimensional and power model applying real shape without any simplification, according to actual running condition. Getting distribution of velocity, pressure and viscosity applying ANSYS. And getting distribution of shear rate, shear stress and average shear rate, average shear stress, through managing program. All these jobs are done for evaluating mixing effect. Finding the relationship of the flux, reflux, average shear rate, and average shear stress with some parameters, such as rotating speed, pressure difference, stagger and clearance.