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Effect of Screw Stagger on Mixing in a Tangential Counter-Rotating Twin Screw Extruder

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Published/Copyright: May 27, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 4 Issue 4

Abstract

The Counter-Rotating, Tangential Twin Screw Extruder (CR TSE) is a polymer processing device which has been in industrial use for dozens of years. Over this period of time, many of the design parameters have been studied for their effect on processing issues that are related to a particular application. Recent studies have shown that the CR TSE is a greater-than-linear mixer and that is due primarily to the flow in the nip region. This study seeks to determine the relationship between mixing rates and percent of screw stagger. Using a flow visualization technique of an acid-dyeeradication, experiments were conducted varying the stagger setting every 10%. In this experiment the total mixing length was used as the measure of mixing. Data was taken at the time of the experiment and the process was videotaped for later review and data evaluation. The technique provides both qualitative and quantitative information. A discussion of the nature of the extruder performance as a function of screw stagger is reported and important design considerations presented.

* Mail address: Dr. David Bigio, Department of Mechanical Engineering, University of Maryland, College Park Campus, College Park, Maryland 20742, U.S.A.
Published Online: 2013-05-27
Published in Print: 1989-12-01

© 1989, Carl Hanser Verlag, Munich

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. New Aspects in the Design of Extruders with a Forced Feeding Section
  5. Flow of Rubber Compound in a Pin Barrel Screw Extruder
  6. Foam Processing with Rigid Polyvinylchloride
  7. A Model for Single-screw Plasticating Extruders
  8. Effect of Screw Stagger on Mixing in a Tangential Counter-Rotating Twin Screw Extruder
  9. Mixing, Devolatilization, and Reactive Processing in the a Farrel Continuous Mixer**
  10. Investigations of the Residence Time and the Longitudinal Mixing Behavior in Counter-rotating Twin Screw Extruders
  11. Flow in a Modular Intermeshing Co-rotating Twin Screw Extruder
  12. Continuous Melt Polymerization of Polyetherimides
https://doi.org/10.3139/217.890242

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. New Aspects in the Design of Extruders with a Forced Feeding Section
  5. Flow of Rubber Compound in a Pin Barrel Screw Extruder
  6. Foam Processing with Rigid Polyvinylchloride
  7. A Model for Single-screw Plasticating Extruders
  8. Effect of Screw Stagger on Mixing in a Tangential Counter-Rotating Twin Screw Extruder
  9. Mixing, Devolatilization, and Reactive Processing in the a Farrel Continuous Mixer**
  10. Investigations of the Residence Time and the Longitudinal Mixing Behavior in Counter-rotating Twin Screw Extruders
  11. Flow in a Modular Intermeshing Co-rotating Twin Screw Extruder
  12. Continuous Melt Polymerization of Polyetherimides
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