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A Model for Single-screw Plasticating Extruders

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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

A mathematical model has been developed to describe the steady-state behavior of single-screw plasticating extruders. The model is capable of predicting the solid bed profile, pressure, and polymer temperature profiles along the screw channel. The model is based on concepts developed by Tadmor and Klein [1], but a modified model for plastication rate is proposed and the pressure profile is calculated using a unidirectional power-law flow model, in which correction factors for flight walls, curvature, and varying channel height have been incorporated. A finite difference technique (Crank-Nichols on method) is used to compute the polymer temperature profile. The overall extruder performance (pressure, temperature and solid bed profiles) is obtained with short computer times on a personal computer (typically one minute on IBM AT). A series of menus and graphics allow for selective simulation and rapid visualization of effects of key parameters, making the model attractive for screw design and optimization of operating conditions. The predictions are in good agreement with experimental data obtained for a polyethylene on a 45 mm diameter screw extruder.

* Mail address: Prof. Dr. P. J. Carreau, Dept. of Chem. Eng., Ecole Polytechnique de Montreal, C. P. 6079, Succ. “A” Montreal, Quebec H3C 3A 7, Canada.
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/10.3139/217.890232

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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