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Physically-Based Model of Thermoplastics Injection Molding for Control Applications

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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 4

Abstract

A non-linear mathematical model of the thermoplastics injection molding cycle is presented. The model is formulated based on the conservation equations for the filling, packing, and cooling phases. The whole process is divided into subsystems including the hydraulic system, ram-screw, barrel, and polymer delivery system. It is found necessary to account for polymer melt elasticity as well as the non-Newtonian behavior of the polymer melt flow. The growing solid skin in the sprue, runner, and gate are considered. The governing equations are solved numerically. Model predictions are in good agreement with experimental data for the injection molding of high density polyethylene. The resulting model is a useful tool for the study and design of injection molding controllers, machine parameter selection, and equipment design.

* Mail address: M. R. Kamal, Department of Chemical Engineering. McGill University, Montreal, Canada, H3A 2A7
Received: 1995-12-19
Accepted: 1996-5-20
Published Online: 2013-05-28
Published in Print: 1996-12-01

© 1996, Carl Hanser Verlag, Munich

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. First in a Series: Pioneers of Polymer Processing: Thomas Hancock – The First Polymer Processing Innovator
  5. Mixing
  6. The Extensional Flow Mixer, EFM
  7. Reactive Extrusion
  8. Continuous Polymerization of Caprolactam-Polyether Sulfone Solutions in a Twin Screw Extruder to Form Reactive Polyamide–6/Polyether Sulfone Blends and Their Melt Spun Fibers
  9. Biodegradable Poly(Lactic Acid) with High Molecular Weight
  10. Acceleration of Chemical Reaction in Reactive Extrusion Accompained by Devolatilization
  11. Fibers and Films
  12. Viscous-Elastic Effects in a PA 6 Melt – Cause of Unevennesses in Melt-Spun Yarns**
  13. Gear Pump Performance in Polypropylene Filament Yarn Uniformity
  14. Molding
  15. Physically-Based Model of Thermoplastics Injection Molding for Control Applications
  16. Effect of Pressure and Shear Stress on Crystallization Behaviors in Injection Molding
  17. The Crystallinity of PVC and its Effect on Physical Properties**
  18. Molecular Orientation in Polycarbonate Induced by Cooling Stresses
https://doi.org/10.3139/217.960352

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. First in a Series: Pioneers of Polymer Processing: Thomas Hancock – The First Polymer Processing Innovator
  5. Mixing
  6. The Extensional Flow Mixer, EFM
  7. Reactive Extrusion
  8. Continuous Polymerization of Caprolactam-Polyether Sulfone Solutions in a Twin Screw Extruder to Form Reactive Polyamide–6/Polyether Sulfone Blends and Their Melt Spun Fibers
  9. Biodegradable Poly(Lactic Acid) with High Molecular Weight
  10. Acceleration of Chemical Reaction in Reactive Extrusion Accompained by Devolatilization
  11. Fibers and Films
  12. Viscous-Elastic Effects in a PA 6 Melt – Cause of Unevennesses in Melt-Spun Yarns**
  13. Gear Pump Performance in Polypropylene Filament Yarn Uniformity
  14. Molding
  15. Physically-Based Model of Thermoplastics Injection Molding for Control Applications
  16. Effect of Pressure and Shear Stress on Crystallization Behaviors in Injection Molding
  17. The Crystallinity of PVC and its Effect on Physical Properties**
  18. Molecular Orientation in Polycarbonate Induced by Cooling Stresses
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