Residual Wall Thickness Distribution at the Transition and Curve Sections of Water-assisted Injection Molded Tubes
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S.-J. Liu
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.
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© 2007, Carl Hanser Verlag, Munich
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- International Polymer Processing Special Issue: European Coating Symposium 2005, University of Bradford, UK
- Invited Papers
- Coating and Polymer Processing
- Practical Limitations to Carrier Layer Formation on Inclined Planes
- Simulation of 3D Crystallization of Colloidal Nanoparticles on a Substrate during Drying
- Asymmetric Surface Roughness Formationon Moving Non-isothermal Liquid Coatings
- Inkjet Printing of Conductive and Resistive Coatings
- Moisture Sorption and Transport in Polylactide
- 10.3139/217.0992
- Review Article
- Welding of Plastics: Fundamentals and New Developments
- Regular Contributed Articles
- Numerical Simulation of Viscous Flow in a Partially filled Co-rotating Twin Screw Extruder
- Invited Papers
- A New Calculation Model and Optimization Method for Maddock Mixers in Single Screw Plasticising Technology
- Regular Contributed Articles
- Residual Wall Thickness Distribution at the Transition and Curve Sections of Water-assisted Injection Molded Tubes
- Numerical Simulation of Extrusion Coating
- Correlation between Injection Molding Parameters, Morphology and Mechanical Properties of PPS/SEBS Blend Using Artificial Neural Networks
- PPS News
- PPS News
- Seikei-Kakou Abstracts
- Seikei-Kakou Abstracts
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- International Polymer Processing Special Issue: European Coating Symposium 2005, University of Bradford, UK
- Invited Papers
- Coating and Polymer Processing
- Practical Limitations to Carrier Layer Formation on Inclined Planes
- Simulation of 3D Crystallization of Colloidal Nanoparticles on a Substrate during Drying
- Asymmetric Surface Roughness Formationon Moving Non-isothermal Liquid Coatings
- Inkjet Printing of Conductive and Resistive Coatings
- Moisture Sorption and Transport in Polylactide
- 10.3139/217.0992
- Review Article
- Welding of Plastics: Fundamentals and New Developments
- Regular Contributed Articles
- Numerical Simulation of Viscous Flow in a Partially filled Co-rotating Twin Screw Extruder
- Invited Papers
- A New Calculation Model and Optimization Method for Maddock Mixers in Single Screw Plasticising Technology
- Regular Contributed Articles
- Residual Wall Thickness Distribution at the Transition and Curve Sections of Water-assisted Injection Molded Tubes
- Numerical Simulation of Extrusion Coating
- Correlation between Injection Molding Parameters, Morphology and Mechanical Properties of PPS/SEBS Blend Using Artificial Neural Networks
- PPS News
- PPS News
- Seikei-Kakou Abstracts
- Seikei-Kakou Abstracts
