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Towards a 3-D Finite Element Model for the Gas-Assisted Injection Moulding Process

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Published/Copyright: June 4, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 12 Issue 3

Abstract

The Gas-Assisted Injection Moulding process (GAIM) offers a number of advantages, which are almost without exception related to the negligible pressure drop in the gas core of the moulded product. Accurate prediction of the gas distribution inside GAIM products is, however, still a major problem to be solved. As gas penetration is governed by three-dimensional phenomena, one has to resort to numerical simulations to analyse the process. Therefore, a numerical model for GAIM simulations has been developed, based on a physical, rather than on an empirical approach. The model employs a pseudo-concentration method in order to avoid elaborate three-dimensional remeshing, and has been implemented in a finite element program.

Simulation results for two-dimensional test cases representing typical GAIM situations prove that the model covers most of the important aspects of gas injection. A pilot simulation for a simple three-dimensional mould demonstrates that the model is able to deal with three-dimensional GAIM. Further refinement of the model will mainly concern the implementation of faster and less memory-consuming solution methods.

* Mail address: G. A. A. V. Haagh, Centre for Polymers and Composites, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
Received: 1996-9
Accepted: 1996-11-7
Published Online: 2013-06-04
Published in Print: 1997-09-01

© 1997, Carl Hanser Verlag, Munich

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Dedication In Memorial to Konathala Himasekhar (1957–1995)
  5. Regular Contributed Articles
  6. Towards a 3-D Finite Element Model for the Gas-Assisted Injection Moulding Process
  7. Numerical Simulation of the Multi-Component Injection Moulding Process
  8. Shrinkage Prediction for Slowly-Crystallizing Thermoplastic Polymers in Injection Molding
  9. The Optimized Quasi-Planar Approximation for Predicting Fiber Orientation in Injection-Molded Composites1
  10. Modelling the PVT Behavior of Isotactic Polypropylene
  11. Extension of 2½ D Control Volume Methods for Transverse Flow at Sprues, Gates and Junctions
  12. Numerical Modelling of the Mould Filling Stage in Gas-Assisted Injection Moulding
  13. Modular Tangential Counter-Rotating Twin Screw Extrusion: Non-Newtonian and Non-Isothermal Simulation
  14. A Parametric Study of Sink Marks in Injection-Molded Plastic Parts using the Finite Element Method
https://doi.org/10.3139/217.970207

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Dedication In Memorial to Konathala Himasekhar (1957–1995)
  5. Regular Contributed Articles
  6. Towards a 3-D Finite Element Model for the Gas-Assisted Injection Moulding Process
  7. Numerical Simulation of the Multi-Component Injection Moulding Process
  8. Shrinkage Prediction for Slowly-Crystallizing Thermoplastic Polymers in Injection Molding
  9. The Optimized Quasi-Planar Approximation for Predicting Fiber Orientation in Injection-Molded Composites1
  10. Modelling the PVT Behavior of Isotactic Polypropylene
  11. Extension of 2½ D Control Volume Methods for Transverse Flow at Sprues, Gates and Junctions
  12. Numerical Modelling of the Mould Filling Stage in Gas-Assisted Injection Moulding
  13. Modular Tangential Counter-Rotating Twin Screw Extrusion: Non-Newtonian and Non-Isothermal Simulation
  14. A Parametric Study of Sink Marks in Injection-Molded Plastic Parts using the Finite Element Method
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