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Bulk Density of Plastic Pellets in a Screw Channel

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Published/Copyright: May 28, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 10 Issue 1

Abstract

For a correct calculation of the material throughput of single screw extruders in the by solids dominated feed area, the accurate knowledge of the effective bulk density is important. In the screw channel the bulk density measured in a quasi infinite vessel cannot be achieved during processing. The effective density is reduced according to the wall influences. If a two component system exists in the feed area, for example, when processing moulding compounds or regrind, then the bulk density changes likewise. In the following a procedure is described, by which the effect of the screw core measurement and the percentage composition of two material mixtures on the effective bulk density can be calculated.

* Mail address: Prof. Dr. H. Potente, Kunststofftechnologie, Uni-versität-GH Paderborn, Pohlweg 47–49, D-33098 Paderborn, Germany.
Received: 1994-2-16
Accepted: 1994-6-29
Published Online: 2013-05-28
Published in Print: 1995-03-01

© 1995, Carl Hanser Verlag, Munich

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Battenfeld: International Polymer Processing Machinery Manufacturer
  5. Screw Extrusion/Mixing
  6. On-line Measurement of Residence Time Distribution in a Twin-screw Extruder
  7. Bulk Density of Plastic Pellets in a Screw Channel
  8. Simulation of the Screw Bowing Effect in an Intermeshing Counter-Rotating Twin-screw Extruder
  9. Blending of SAN and SBS in Corotating Twin-screw Extruders
  10. Blends of PVC with Miscible Polymers
  11. Solids Transport in Extruders
  12. Reactive Processing
  13. Compounding and Morphology of Nylon/Ethylene-Propylene Rubber Reactive and Nonreactive Blends
  14. Die Extrusion
  15. Approximate Simulation Method on the Three-dimensional Polymer Melts Flow in a Die
  16. Molding
  17. On the Simulation of Thermoplastic Injection Moulding Process
  18. Simulation of Heat Transfer and Melting in Rotational Molding
  19. Polyarylamide/Polypropylene Blends
  20. Flexural Stiffness of Injection Molded Glass Fiber Reinforced Thermoplastics
  21. Control Volume Finite Element Method for Mold Filling Simulation
https://doi.org/10.3139/217.950010

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Battenfeld: International Polymer Processing Machinery Manufacturer
  5. Screw Extrusion/Mixing
  6. On-line Measurement of Residence Time Distribution in a Twin-screw Extruder
  7. Bulk Density of Plastic Pellets in a Screw Channel
  8. Simulation of the Screw Bowing Effect in an Intermeshing Counter-Rotating Twin-screw Extruder
  9. Blending of SAN and SBS in Corotating Twin-screw Extruders
  10. Blends of PVC with Miscible Polymers
  11. Solids Transport in Extruders
  12. Reactive Processing
  13. Compounding and Morphology of Nylon/Ethylene-Propylene Rubber Reactive and Nonreactive Blends
  14. Die Extrusion
  15. Approximate Simulation Method on the Three-dimensional Polymer Melts Flow in a Die
  16. Molding
  17. On the Simulation of Thermoplastic Injection Moulding Process
  18. Simulation of Heat Transfer and Melting in Rotational Molding
  19. Polyarylamide/Polypropylene Blends
  20. Flexural Stiffness of Injection Molded Glass Fiber Reinforced Thermoplastics
  21. Control Volume Finite Element Method for Mold Filling Simulation
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