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A New Plasticating Model for Amorphous and Semi-crystalline Polymers in Single Screw Extruders

  • G. Zitzenbacher and G. R. Langecker
Published/Copyright: March 3, 2022
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International Polymer Processing
From the journal International Polymer Processing Volume 20 Issue 4

Abstract

Polymeric thermoplastic materials can be subdivided in amorphous and semi-crystalline ones. In contrast to semi-crystalline polymers amorphous thermoplastic materials have no defined phase transition and hence no melt enthalpy. The glass transition region describes the change of the material behaviour from the state of a rubber like to an under-cooled fluid (glassy state). Setting the melt enthalpy in the Stefan-Neumann problem zero gives no valid results for the solid bed profile. Thus this condition is unsuitable for describing the plasticating process of amorphous polymers.

In this paper a new model for the plastication of amorphous and semi-crystalline polymers in single screw extruders is presented. Therefore a new calculation method for the determination of the moving velocity between the glassy solid bed and the softened film region on the barrel surface is developed. The whole enthalpy to heat up the polymer on a critical flow temperature in the screw channel is considered.

* Mail address: G. Zitzenbacher, University of Applied Sciences FH-Wels, Department of Material Engineering, Roseggerstrasse 12, A-4600 Wels, Austria

  1. YYou will find the article and additional material by entering the document number IIPP0089 on our website at www.polymer-process.com

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Received: 2004-09-21
Accepted: 2005-07-17
Published Online: 2022-03-03

© 2005 Hanser Publishers, Munich

Articles in the same Issue

  1. Contents
  2. Regular Contributed Articles
  3. An Improvement on Design of Sheet Extrusion Dies
  4. Organic-Inorganic Hybrid Material Synthesis by on Line Coupling Twin Screw Extruder with a Microwave Oven
  5. Water Penetration Stability in Water Assisted Injection Molded Symmetric Ribs
  6. A New Plasticating Model for Amorphous and Semi-crystalline Polymers in Single Screw Extruders
  7. Simultaneous Biaxial Stretching of Polypropylene Resins of Varying Tacticity
  8. Optimization of a Flat Die Including Elongational Viscosity Effects
  9. Experimental Study on Factors Influencing Throughput Rate and Process of Polymer-Mineral Filler Mixing in a Twin Screw Extruder
  10. 3D Finite Element Simulation of Processing of Generalized Newtonian Fluids in Counter-rotating and Tangential TSE and Die Combination
  11. Simulation of Heat Transfer in Laser Transmission Welding
  12. Influence of Power Law and Isothermal Simplification on the Accuracy in Single Screw Extrusion
  13. Melt Intercalation in Montmorillonite/Polystyrene Nanocomposites
  14. Experimental Investigation of the Effect of the Bubble Cone on the Cooling Jets used in the Blown Film Manufacturing Process
  15. Molding of Thin Sheets Using Impact Micro-injection Molding
  16. Rapid communications
  17. Ultrasonic Vibration Hot Embossing
  18. PPS news
  19. PPS news
  20. Seikei-kakou abstracts
  21. Seikei-kakou abstracts
https://doi.org/10.1515/ipp-2005-0064

Articles in the same Issue

  1. Contents
  2. Regular Contributed Articles
  3. An Improvement on Design of Sheet Extrusion Dies
  4. Organic-Inorganic Hybrid Material Synthesis by on Line Coupling Twin Screw Extruder with a Microwave Oven
  5. Water Penetration Stability in Water Assisted Injection Molded Symmetric Ribs
  6. A New Plasticating Model for Amorphous and Semi-crystalline Polymers in Single Screw Extruders
  7. Simultaneous Biaxial Stretching of Polypropylene Resins of Varying Tacticity
  8. Optimization of a Flat Die Including Elongational Viscosity Effects
  9. Experimental Study on Factors Influencing Throughput Rate and Process of Polymer-Mineral Filler Mixing in a Twin Screw Extruder
  10. 3D Finite Element Simulation of Processing of Generalized Newtonian Fluids in Counter-rotating and Tangential TSE and Die Combination
  11. Simulation of Heat Transfer in Laser Transmission Welding
  12. Influence of Power Law and Isothermal Simplification on the Accuracy in Single Screw Extrusion
  13. Melt Intercalation in Montmorillonite/Polystyrene Nanocomposites
  14. Experimental Investigation of the Effect of the Bubble Cone on the Cooling Jets used in the Blown Film Manufacturing Process
  15. Molding of Thin Sheets Using Impact Micro-injection Molding
  16. Rapid communications
  17. Ultrasonic Vibration Hot Embossing
  18. PPS news
  19. PPS news
  20. Seikei-kakou abstracts
  21. Seikei-kakou abstracts
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