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Residual Wall Thickness Distribution at the Transition and Curve Sections of Water-assisted Injection Molded Tubes

  • S.-J. Liu and M.-H. Hsieh
Published/Copyright: March 26, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 22 Issue 1

Abstract

Water-assisted injection molding technology has been used to manufacture plastic tubes in recent years, due to its light weight, relatively lower resin cost per part and faster cycle time. The residual wall thickness around dimensional transitions and curved sections can significantly affect the strength of molded parts and is of great concern. This research investigated the uniformity of the residual wall thickness distribution in water-assisted injection molded circular tubes with dimensional variations and curved sections. Experiments were carried out on an 80-ton injection-molding machine equipped with a lab scale water injection system, which included a water pump, a pressure accumulator, a water injection pin, a water tank equipped with a temperature regulator, and a control circuit. The material used was semi-crystalline polypropylene. It was found that the wall thickness was not uniform near transitions. With the addition of fillets with proper angles around transitions, the uniformity of residual wall could be greatly improved. The residual wall thickness in curved sections was thick around the outer wall and thin around the inner wall. In addition, the experimental results suggest that water-assisted molded parts exhibit a more uniform thickness distribution at transition and curved sections than in gas-assisted molded parts.

∗ Mail address: S.-J. Liu, Polymer Rheology and Processing Lab., Department of Mechanical Engineering, Chang Gung University, 259, Wen-Hwa 1st Road, Kwei-San, Tao-Yuan 333, Taiwan. E-mail:

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Received: 2005-11-29
Accepted: 2006-11-4
Published Online: 2013-03-26
Published in Print: 2007-03-01

© 2007, Carl Hanser Verlag, Munich

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  1. Contents
  2. Contents
  3. Editorial
  4. International Polymer Processing Special Issue: European Coating Symposium 2005, University of Bradford, UK
  5. Invited Papers
  6. Coating and Polymer Processing
  7. Practical Limitations to Carrier Layer Formation on Inclined Planes
  8. Simulation of 3D Crystallization of Colloidal Nanoparticles on a Substrate during Drying
  9. Asymmetric Surface Roughness Formationon Moving Non-isothermal Liquid Coatings
  10. Inkjet Printing of Conductive and Resistive Coatings
  11. Moisture Sorption and Transport in Polylactide
  12. 10.3139/217.0992
  13. Review Article
  14. Welding of Plastics: Fundamentals and New Developments
  15. Regular Contributed Articles
  16. Numerical Simulation of Viscous Flow in a Partially filled Co-rotating Twin Screw Extruder
  17. Invited Papers
  18. A New Calculation Model and Optimization Method for Maddock Mixers in Single Screw Plasticising Technology
  19. Regular Contributed Articles
  20. Residual Wall Thickness Distribution at the Transition and Curve Sections of Water-assisted Injection Molded Tubes
  21. Numerical Simulation of Extrusion Coating
  22. Correlation between Injection Molding Parameters, Morphology and Mechanical Properties of PPS/SEBS Blend Using Artificial Neural Networks
  23. PPS News
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  25. Seikei-Kakou Abstracts
  26. Seikei-Kakou Abstracts
https://doi.org/10.3139/217.0130

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. International Polymer Processing Special Issue: European Coating Symposium 2005, University of Bradford, UK
  5. Invited Papers
  6. Coating and Polymer Processing
  7. Practical Limitations to Carrier Layer Formation on Inclined Planes
  8. Simulation of 3D Crystallization of Colloidal Nanoparticles on a Substrate during Drying
  9. Asymmetric Surface Roughness Formationon Moving Non-isothermal Liquid Coatings
  10. Inkjet Printing of Conductive and Resistive Coatings
  11. Moisture Sorption and Transport in Polylactide
  12. 10.3139/217.0992
  13. Review Article
  14. Welding of Plastics: Fundamentals and New Developments
  15. Regular Contributed Articles
  16. Numerical Simulation of Viscous Flow in a Partially filled Co-rotating Twin Screw Extruder
  17. Invited Papers
  18. A New Calculation Model and Optimization Method for Maddock Mixers in Single Screw Plasticising Technology
  19. Regular Contributed Articles
  20. Residual Wall Thickness Distribution at the Transition and Curve Sections of Water-assisted Injection Molded Tubes
  21. Numerical Simulation of Extrusion Coating
  22. Correlation between Injection Molding Parameters, Morphology and Mechanical Properties of PPS/SEBS Blend Using Artificial Neural Networks
  23. PPS News
  24. PPS News
  25. Seikei-Kakou Abstracts
  26. Seikei-Kakou Abstracts
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