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Flow of Rubber Compound in a Pin Barrel 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

A cold feed rubber extruder has been rebuilt into a pin barrel extruder with two rows of pins. A comparative experimental study has been made of the initial cold feed extruder, the extruder with a screw with slices in two flights, and the extruder with pins as well as Slight slices. An experimental study of pumping characteristics (Q – Δp screw curves) and of flow patterns obtained from feeding black and white compound with curatives to the extruder with subsequent vulcanization after steady state is achieved. Longitudinal and transverse sections of the rubber compound cured in the flights are studied. It is shown that introducing slices into screw flights reduces pumping capability. The subsequent introduction of pins has little effect on pumping. The flow marker studies show that introduction of slices into screw flights significantly enhances mixing. Both the improved mixing and poorer pumping is due to backflow through the slices. The introduction of pins is shown to again greatly increase mixing. The results of this study are used to discuss the performance and design of commercial pin barrel extruders for the rubber industry.

* Mail address: Prof. Dr. J. L. White, Polymer Engineering Center, University of Akron, Akron, Ohio 44325, 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/10.3139/217.890219

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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