Design of certain fluted mixing sections of extruder screws

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Abstract
A theoretical model is proposed, for certain barrier type fluted mixing sections of extruder screws. Screws with such mixing sections are occasionally used in plasticating extruders. With the aid of this model, these screws can now be quantitatively simulated in the design stage. Specifically the model enables the calculation of pressure change across the section as a function of geometrical configuration of the mixing section and operating conditions.A generalized set of curves, plotted in dimensionless form, for quick manual computation is also given. With its aid, the effect of the design variables on the pressure change is discussed.Finally, mixing section‐zones, in reference to the plasticating extrusion theory, and the state of the art of extrusion theory are very briefly discussed.

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