Encyclopedic Dictionary of Polymers

2011 Edition
| Editors: Jan W. Gooch

Reverse-Flighted Screw

  • Jan W. Gooch
Reference work entry
DOI: https://doi.org/10.1007/978-1-4419-6247-8_10002

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.

Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Jan W. Gooch
    • 1
  1. 1.AtlantaUSA