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Flow in a Modular Intermeshing Co-rotating Twin Screw Extruder

1989; De Gruyter; Volume: 4; Issue: 4 Linguagem: Inglês

10.3139/217.890262

2195-8602

Y. Wang, James L. White, Witold Szydlowski,

Fluid Dynamics and Vibration Analysis

Abstract The flow of viscous power law fluids in the various modules of a modular intermeshing co-rotating twin screw extruder. This includes right-handed and left-handed screw elements and kneading disc assemblies with various staggering angles. The calculations are based on hydrodynamic lubrication theory used a new calculation method based on combining methods by Tadmor, Broyer and Gutfinger, and by Griffith. The behavior of a composite twin screw extruder consisting of assemblies of screw and kneading disc elements is investigated and the potential of having a sequence of fully filled and starved regions is considered. The existence of such distribution of polymer and starvation behavior in a twin screw machine was found in experiments with a polyethylene. The material distribution is reasonably well predicted by the non-Newtonian flow model of this paper.