Twin Screw Extrusion

PolymerProcessing.com logo

Overview

Twin screw extrusion is used extensively for mixing, compounding, or reacting polymeric materials. The flexibility of twin screw extrusion equipment allows this operation to be designed specifically for the formulation being processed. For example, the two screws may be corotating or counterrotating, intermeshing or nonintermeshing. In addition, the configurations of the screws themselves may be varied using forward conveying elements, reverse conveying elements, kneading blocks, and other designs in order to achieve particular mixing characteristics.

Process Schematic

(Click to enlarge)

twin screw extruder

References

A good overview reference is:
J.L. White, Twin Screw Extrusion: Technology and Principles, Hanser Publishers, New York (1991) ISBN 3446156917.

Suppliers of Twin Screw Extruders

APV
Krupp Werner and Pfleiderer Inc.
Leistritz
Theysohn
Wayne Machine and Die Company


Copyright 2000, 2001 PolymerProcessing.com