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Licensed Unlicensed Requires Authentication Published by De Gruyter September 7, 2013

An optical system for measuring the residence time distribution in co-rotating twin-screw extruders

  • Gregor Gerstorfer EMAIL logo , Alexander Lepschi , Jürgen Miethlinger and Bernhard G. Zagar


Expanding the general knowledge of the extrusion process in a co-rotating twin-screw extruder requires several parameters to be determined, among them the residence time distribution (RTD). This contribution introduces an optical measurement setup for acquiring the residence time density and distribution function. Based on our measurement results, we derive the influence of the rotational speed of the screws, mass flow rate and of different types of screw configurations on residence time.

Corresponding author: Gregor Gerstorfer, Institute for Measurement Technology, Johannes Kepler University, Linz, Austria, e-mail:

The authors gratefully acknowledge the partial financial support for the work presented in this paper by the Austrian Research Promotion Agency and the Austrian COMET Program supporting the Austrian Center of Competence in Mechatronics (ACCM), and the industry partner Tiger Coatings GmbH & Co. KG.


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Received: 2013-3-1
Accepted: 2013-8-12
Published Online: 2013-09-07
Published in Print: 2013-11-01

©2013 by Walter de Gruyter Berlin Boston

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