Abstract: The 3-D non-isothermal flow field in mixing section of two-rotor continuous mixer was simulated by software POLYFLOW and was tested by PP/PS mixing. The fracture surface morphology of the samples was observed by scanning electron microscope (SEM) in order to study the flow field characteristics. It indicated that: the stretching effects in rotor convergence zone were stronger than those in positive or negative transportation zone in mixing process; the stretching effect of material near the top area of screw edge was stronger and those in the C zone was smaller in the same cross section; the convergent channel at the top area of screw edge provided intense stretching effect. In general, because of special structure of the rotor, material was stretched, fractured, and redistributed repeatedly during the mixing process, which promote dispersion mixing process.

Key words: elongation effect, two-rotor continuous mixer, numerical simulation, experimental verification