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Modeling and Analysis of Helicoidal Flow in a Conical Extruder

  • A. Sarioglu and J.-A. E. Månson
Published/Copyright: June 3, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 18 Issue 3

Abstract

The present paper discusses the unique flow behavior in a new type of extruder. The extruder design is based on a hollow conical assembly of static (stators) and rotating (rotor) parts. Extrusion is achieved from each side of the rotor to provide a two-layer annular product. Flow is helicoidal in the vicinity of the rotor tip and die entry where the polymer layers merge. However, it becomes fully parallel to the main extrusion direction after a certain distance downstream from the rotor tip. Numerical simulations based on the resolution of Navier-Stokes equations using a Generalized-Newtonian viscosity showed that the length of the helicoidal flow depends on die design, viscosity and flow rate ratios between adjacent polymer layers. Analysis of flow variables along the interface showed that the helicoidal flow distance can be increased using a die design inducing lower interfacial shear rate and velocity. When the viscosity ratio and the flow rate of the most viscous polymer are increased, the helicoidal flow can be maintained over a longer distance in the die. Finally, experiments have shown that the advantage of the helicoidal flow is for short fiber orientation in pipes. The fibers are oriented along the streamlines in the hoop direction in the mid-gap of the die; however, they are parallel to extrusion direction in the vicinity of the stators.

* Mail address: J.-A. E. Månson, Lab. de Techn. des Composites et Polymères (LTC), Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
Received: 2002-9-30
Accepted: 2003-3-4
Published Online: 2013-06-03
Published in Print: 2003-09-01

© 2003, Carl Hanser Verlag, Munich

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. First in a Series: Polymer Processing in Developing Countries Polymer Processing in Peru
  5. Screw Extrusion
  6. Modeling and Analysis of Helicoidal Flow in a Conical Extruder
  7. A Powerful Universal Plasticating System for Single-screw-extruders and Injection-moulding Machines
  8. Cross Channel Flow Velocity and Motion Trajectory of Polymers in a Helical Channel
  9. Mixing and Compounding
  10. Influence of Low Molecular Weight Additives on Die Extrusion Rheometer Flow of Thermoplastic Melts
  11. Design of a Static Temperature Scanning Ultrasonic Measurement System and Application to Multi-phase Polymer Systems
  12. Raman Spectroscopy as an On-line Technique to Monitor Shear Flow Effect on Partially Miscible Polymer Blends
  13. Reactive Extrusion
  14. Flow Effects on Polymer Transesterification
  15. A Dynamic Model Accounting for Oscillating Behavior in Reactive Extrusion
  16. Study on Functionalization of Isotactic PP with Maleic Anhydride in an Internal Mixer and a Twin-screw Extruder
  17. Quality Aspects on the Power Cable Core Insulation Extrusion and Thermal Curing Process
  18. Die Extrusion
  19. Flow Balancing in Extrusion Dies for Thermoplastic Profiles
  20. Flow Balancing in Extrusion Dies for Thermoplastic Profiles
  21. Molding
  22. On the Residual Stress and Shrinkage in Injection Compression Molding
https://doi.org/10.3139/217.1747

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. First in a Series: Polymer Processing in Developing Countries Polymer Processing in Peru
  5. Screw Extrusion
  6. Modeling and Analysis of Helicoidal Flow in a Conical Extruder
  7. A Powerful Universal Plasticating System for Single-screw-extruders and Injection-moulding Machines
  8. Cross Channel Flow Velocity and Motion Trajectory of Polymers in a Helical Channel
  9. Mixing and Compounding
  10. Influence of Low Molecular Weight Additives on Die Extrusion Rheometer Flow of Thermoplastic Melts
  11. Design of a Static Temperature Scanning Ultrasonic Measurement System and Application to Multi-phase Polymer Systems
  12. Raman Spectroscopy as an On-line Technique to Monitor Shear Flow Effect on Partially Miscible Polymer Blends
  13. Reactive Extrusion
  14. Flow Effects on Polymer Transesterification
  15. A Dynamic Model Accounting for Oscillating Behavior in Reactive Extrusion
  16. Study on Functionalization of Isotactic PP with Maleic Anhydride in an Internal Mixer and a Twin-screw Extruder
  17. Quality Aspects on the Power Cable Core Insulation Extrusion and Thermal Curing Process
  18. Die Extrusion
  19. Flow Balancing in Extrusion Dies for Thermoplastic Profiles
  20. Flow Balancing in Extrusion Dies for Thermoplastic Profiles
  21. Molding
  22. On the Residual Stress and Shrinkage in Injection Compression Molding
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