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Unstable Gas Penetrations in Symmetrical Rib Channels During Gas-assisted Injection Molding

  • S. Y. Yang and F. Z. Huang
Published/Copyright: May 28, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 10 Issue 2

Abstract

During gas-assisted filling, gas penetrations in symmetrical rib channels are found never symmetrical. The development of this unsymmetry is observed and its cause is analyzed. The system of gas penetrations in melt in symmetrical rib channels is found unstable. Symmetry is upset upon perturbation. Symmetrical gas-channel ribs in gas-assisted injection molded parts should be avoided.

* Mail address: Prof. Dr. S. Y. Yang, Department of Mechanical Engineering, National Taiwan University, 1, Sec. 4, Roosevelt Road, Taipei, Taiwan, R.O.C.
Received: 1994-10-28
Accepted: 1995-2-2
Published Online: 2013-05-28
Published in Print: 1995-05-01

© 1995, Carl Hanser Verlag, Munich

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Fourteenth in a Series: Pomini SpA: Dynamic International Machinery Manufacturer
  5. Internal Mixers
  6. Non-isothermal Dispersive Flow of a Rubber Mixture Inside an Internal Rotor Mixer
  7. Screw Extrusion/Continuous Mixing
  8. Solids Conveying and Melting in a Starve Fed Self-wiping Co-rotating Twin Screw Extruder
  9. Modeling the Residence Time Distribution of a Non-Intermeshing Twin Screw Extruder
  10. Mixing Ring
  11. Morphology in Blends of a Thermotropic Liquid Crystalline Polymer and Polypropylene
  12. Die Extrusion
  13. Mechanical Effects in Extrusion: Slit Dies
  14. Fibers and Films
  15. Relationship of Stresses in Blown-film Processes
  16. Molding
  17. Modelling and Experiments of Squeezing Flow of Polymer Melts
  18. Crystallization Behavior of Carbon Fiber Reinforced Polyamides (I) Dynamic and Isothermal Crystallization
  19. Structures and Properties of Injection Moldings of β-Crystal Nucleator-Added Polypropylenes
  20. Forging
  21. Numerical Simulation of Polymer Forging
  22. Rapid Communication of Recent Advances
  23. Unstable Gas Penetrations in Symmetrical Rib Channels During Gas-assisted Injection Molding
https://doi.org/10.3139/217.950186

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Fourteenth in a Series: Pomini SpA: Dynamic International Machinery Manufacturer
  5. Internal Mixers
  6. Non-isothermal Dispersive Flow of a Rubber Mixture Inside an Internal Rotor Mixer
  7. Screw Extrusion/Continuous Mixing
  8. Solids Conveying and Melting in a Starve Fed Self-wiping Co-rotating Twin Screw Extruder
  9. Modeling the Residence Time Distribution of a Non-Intermeshing Twin Screw Extruder
  10. Mixing Ring
  11. Morphology in Blends of a Thermotropic Liquid Crystalline Polymer and Polypropylene
  12. Die Extrusion
  13. Mechanical Effects in Extrusion: Slit Dies
  14. Fibers and Films
  15. Relationship of Stresses in Blown-film Processes
  16. Molding
  17. Modelling and Experiments of Squeezing Flow of Polymer Melts
  18. Crystallization Behavior of Carbon Fiber Reinforced Polyamides (I) Dynamic and Isothermal Crystallization
  19. Structures and Properties of Injection Moldings of β-Crystal Nucleator-Added Polypropylenes
  20. Forging
  21. Numerical Simulation of Polymer Forging
  22. Rapid Communication of Recent Advances
  23. Unstable Gas Penetrations in Symmetrical Rib Channels During Gas-assisted Injection Molding
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