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Transient Compressible Flow in Injection Molding Runner**

  • M. Amon
Published/Copyright: May 27, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 4 Issue 3

Abstract

The transient flow of a compressible polymer melt in an injection system consisting of a ram, a runner, and a shutoff valve is studied. Experimentally, the exit flow rate is found to have an initial value determined mainly by the precompression level and a steady state determined mainly by the ram speed. This flow rate can fall before it rises again, or it can overshoot its steady state. Such complex behavior is predicted qualitatively by a simplified mathematical model, which neglects elasticity but accounts for the finite compressibility and bulk viscosity. Four dimensionless parameters governing system dynamics are identified and their effects investigated by computation.

* Mail address: Dr. M. Amon, Tri-Tech Systems International, 1280 Dussel Drive, Maumee, Ohio 43537, U.S.A.

** Paper presented in part at the fourth annual meeting, of the Polymer Processing Society, Orlando, U.S.A., May 1988

Published Online: 2013-05-27
Published in Print: 1989-09-01

© 1989, Carl Hanser Verlag, Munich

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. Prediction of Birefringence for Optical Memory Disk
  5. Transient Compressible Flow in Injection Molding Runner**
  6. Advances in Rheological Analysis of Injection Molding
  7. Optical and Mechanical Measurements to Characterize Injection Molded Polypropylene Plates
  8. Experimental Investigation of Rotational Molding and the Characterization of Rotationally Molded Polyethylene-Parts
  9. Blow Molding of Thermotropic Liquid Crystalline Polymers
  10. Position of Neutral Surface during Hollow Disk Compression Molding of Long Fibre-Reinforced Thermoplastics**
  11. Reactive Ion Etching of Polymer Films
  12. Fabrication of Microstructures of Extreme Structural Heights by Reaction Injection Molding
  13. Rheological Properties of Glass Fiber Filled Nylon 6 Composite System
https://doi.org/10.3139/217.890143

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. Prediction of Birefringence for Optical Memory Disk
  5. Transient Compressible Flow in Injection Molding Runner**
  6. Advances in Rheological Analysis of Injection Molding
  7. Optical and Mechanical Measurements to Characterize Injection Molded Polypropylene Plates
  8. Experimental Investigation of Rotational Molding and the Characterization of Rotationally Molded Polyethylene-Parts
  9. Blow Molding of Thermotropic Liquid Crystalline Polymers
  10. Position of Neutral Surface during Hollow Disk Compression Molding of Long Fibre-Reinforced Thermoplastics**
  11. Reactive Ion Etching of Polymer Films
  12. Fabrication of Microstructures of Extreme Structural Heights by Reaction Injection Molding
  13. Rheological Properties of Glass Fiber Filled Nylon 6 Composite System
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