n A short section of a screw in a twin-screw extruder in which the flights have a helical direction opposite to that of the main screw sections, thus opposing the forward flow of the heat-softened plastic. The purpose is to improve mixing and dispersion of compound ingredients such as pigments, and sometimes to heat the melt just before it enters a vacuum-extraction zone. Reverse-flight sections have rarely been used in a single-screw machines.
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Gooch, J.W. (2011). Reverse-Flighted Screw. In: Gooch, J.W. (eds) Encyclopedic Dictionary of Polymers. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-6247-8_10002
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