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Updated: Nov 20, 2025

Twin-Screw Extrusion Process to Produce Renewable Fiberboards
Published on: January 27, 2021
Average Shear Rates in the Screw Elements of a Corotating Twin-Screw Extruder
1CEMEF, MINES ParisTech, PSL Research University, UMR CNRS 7635, 06904 Sophia Antipolis, France.
Abstract:
The rapid estimation of the average shear rate encountered by the material as it flows along the screw elements of a corotating twin-screw extruder is a key point for many applications. In this paper, two methods of evaluation are presented that allow the calculation of the average shear rate as a function of the screw geometry, feed rate, and screw speed. A comparison is made between the approximate and exact methods. It is shown that it is crucial to take into account the shear component due to the pressure flow, especially in the left-handed screw elements.
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