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Modelling the Solids Throughput of Single Screw Smooth Barrel Extruders as a Function of the Feed Section Parameters

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Published/Copyright: April 6, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 27 Issue 4

Abstract

In a smooth barrel extruder, the throughput is generally dominated by the metering sections pumping ability. Within the feed zone, more granules can always be conveyed than can melt in the compression zone and be discharged in the metering zone. At high screw speeds, this effect will only occur if the granules flow quickly enough out of the hopper into the screw channel and this is fully filled. In this case, the solids throughput up to maximum screw speed shows an approximately linear relationship to the speed. These linear solids conveying characteristics necessitate constructional changes to the hopper opening. In this article, solids conveying processes with approximately linear conveying characteristics up to speeds of 2,000 min−1 (peripheral velocities up to 3 m/s) are simulated with various feed hopper geometries. The simulations are carried out by means of DEM (Discrete Element Method) in which the granules are approximated by single spherical particles. From the simulation results, via dimensional analysis a model is derived for describing the throughput as a function of the geometry and process parameters of the solids feed zone.

∗ Mail address: Johann-Sebastian Leßmann, KTP – Kunststofftechnik Paderborn, Warburger Straße 100, D-33098 Paderborn, Germany. E-mail:

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Received: 2011-11-25
Accepted: 2012-02-20
Published Online: 2013-04-06
Published in Print: 2012-08-01

© 2012, Carl Hanser Verlag, Munich

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https://doi.org/10.3139/217.2588

Articles in the same Issue

  1. Contents
  2. Contents
  3. Regular Contributed Articles
  4. LLDPE/Proton Exchanged Layered Niobate K4Nb6O17 Nanocomposites
  5. Experimental Flow Visualization and Residence Time Distributions in a Co-Kneader
  6. Mechanochemical Milling of PP/Ground Tire Rubber Blends in Solid-State
  7. Development of Polymer Extrusion Extruder for Evaluating with a Small Amount of Polymeric Material
  8. A 3D Simulation Analysis of Reactive Flow in Screw Elements of Closely Intermeshing Twin Screw Extruders
  9. Morphology and Mechanical Properties of Compatibilized Bio-sourced PA/Plasticized Starch Grafted PP Ternary Polymer Blends
  10. Preparation and Characterization of Polyurethane/Polysulfide Miscible Blend Nanocomposites
  11. Modelling the Solids Throughput of Single Screw Smooth Barrel Extruders as a Function of the Feed Section Parameters
  12. Experimental Investigation and Theoretical Prediction of Extrudate Swell Using Conformational Rheological Models
  13. Controllable Self-organization of Polyphenylene Oxide Honeycomb Microstructure
  14. An Investigation on Usage of Sodium Borohydride and Zinc Oxide as Oxygen Scavengers in Polyethylene Terephthalate Films
  15. PPS-News
  16. PPS News
  17. Seikei Kakou Abstracts
  18. Seikei-Kakou Abstracts
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