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Analysis of the Local Volume Flow Rate of Polymers During Injection Molding

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Published/Copyright: May 28, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 11 Issue 1

Abstract

Amorphous and crystalline polymers were injected into different molds of disks, with different applied injection rates. The pressures and local volume flow rates were measured for different injection molding conditions. These measures show a difference between the average volume flow rate measured during the total filling time and the nominal applied volume flow rate. Moreover the local volume flow rate at the polymer front increases between the mold entrance and the end of the cavity. Effects of different parameters of the process (polymer, geometry of the part, injection molding conditions) on the evolution of these volume flow rates were examined. Interpretation of the observed phenomena neads to take into account the effect of two characteristics of the polymers which are generally neglected: the compressibility and the associated bulk viscosity.

* Mail address: Prof. J. Pabiot, Ecole des Mines de Douai, Département Technologie des Polymères et Composites, 941 Rue Charles Bourseul BP 838, 59508 Douai Cedex, France
Received: 1994-3-2
Accepted: 1995-8-29
Published Online: 2013-05-28
Published in Print: 1996-03-01

© 1996, Carl Hanser Verlag, Munich

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Seventeenth in a Series: Reifenhäuser – From Blacksmiths to Master Integrated Screw Extrusion System Manufacturers
  5. Invited Paper
  6. 35 Years of Studies of Mixing of Rubber and Viscoelasticity
  7. Mixing
  8. Melt Strength and Elastic Behaviour of LLDPE/LDPE Blends
  9. Screw Extrusion
  10. Melting and Blending in a Modular Co-Rotating/Counter-Rotating Twin Screw Extruder
  11. A Physico-Mathematical Model for Solids Conveying in Co-Rotating Twin Screw Extruders
  12. Fibers and Films
  13. High-speed Melt Spinning of PET
  14. Die Extrusion
  15. Evaluation of the FAN Technique for Profile Die Design
  16. Molding
  17. Analysis of the Mold Filling Process with Phase Change Considering the Non-steady Effect
  18. Analysis of the Local Volume Flow Rate of Polymers During Injection Molding
  19. Surface Defect Formation in the Injection Molding of Acrylonitrile-Styrene-Acrylate Polymers
  20. Injection Molding of Microcomposites Based on Polypropylene and Thermotropic Liquid Crystalline Polymers
https://doi.org/10.3139/217.960068

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Seventeenth in a Series: Reifenhäuser – From Blacksmiths to Master Integrated Screw Extrusion System Manufacturers
  5. Invited Paper
  6. 35 Years of Studies of Mixing of Rubber and Viscoelasticity
  7. Mixing
  8. Melt Strength and Elastic Behaviour of LLDPE/LDPE Blends
  9. Screw Extrusion
  10. Melting and Blending in a Modular Co-Rotating/Counter-Rotating Twin Screw Extruder
  11. A Physico-Mathematical Model for Solids Conveying in Co-Rotating Twin Screw Extruders
  12. Fibers and Films
  13. High-speed Melt Spinning of PET
  14. Die Extrusion
  15. Evaluation of the FAN Technique for Profile Die Design
  16. Molding
  17. Analysis of the Mold Filling Process with Phase Change Considering the Non-steady Effect
  18. Analysis of the Local Volume Flow Rate of Polymers During Injection Molding
  19. Surface Defect Formation in the Injection Molding of Acrylonitrile-Styrene-Acrylate Polymers
  20. Injection Molding of Microcomposites Based on Polypropylene and Thermotropic Liquid Crystalline Polymers
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