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Visualization Analysis of Asymmetric Fountain Flow Phenomenon in Injection Molding of Filler-reinforced Resins by Rotary Runner Exchange System

  • H. Yokoi and Y. Kanetoh
Published/Copyright: April 30, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 20 Issue 2

Abstract

In this study, we attempted to visualize the flow patterns inside molded samples of glass-fibers or talc reinforced GPPS and PP especially in the vicinity of the flow front, using a rotary runner exchange system which instantaneously switches melt flowing into the cavity. From the visualization results, an extremely characteristic flow behavior was seen at the flow front area for resins with fillers which was not observed for those without fillers. Especially in the case of resins with 40 wt.% talc or 30 wt.% GF, a-symmetric zigzag fountain flows were generated alternately upward and downward along the cavity width direction. Moreover along the outer layer of the flow front, one observed a large amount of residual resin remaining for a long time during the cavity filling process, in the case of 40 wt.% GF, primarily due to the increase of viscosity which restricts the occurrence of diverging flow. Based on the above visualization results, we proposed a generic model of zigzag fountain flow; an a-symmetric upward flow in a certain area starts preventing the fountain flow in the upper side of the adjacent area, causing the diverging center to sink. This phenomenon subsequently causes an a-symmetric flow in the opposite direction in the next adjacent area, which continuously propagates along the cavity width direction.

∗ Mail address: H. Yokoi, Center for Collaborative Research, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-8904, Japan E-mail:

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Received: 2004-10-23
Accepted: 2005-2-15
Published Online: 2013-04-30
Published in Print: 2005-05-01

© 2005, Carl Hanser Verlag, Munich

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. International Polymer Processing Special Issue Macro 2004
  5. Invited Paper
  6. A Dilatometer to Measure the Influence of Cooling Rate and Melt Shearing on Specific Volume
  7. Monitoring Reactive Processes along the Extruder
  8. Stretch and Shape Distributions of Droplets with Interfacial Tension in Chaotic Mixing
  9. Cast Film Extrusion
  10. Nozzle Injection of Physical Blowing Agents in the Injection Molding of Microcellular Foams
  11. Visualization Analysis of Asymmetric Fountain Flow Phenomenon in Injection Molding of Filler-reinforced Resins by Rotary Runner Exchange System
  12. In-process Monitoring of Micromoulding – Assessment of Process Variation
  13. Processing-induced Properties in Glassy Polymers
  14. Structure Development in Injection Molding: A 3D Simulation with a Differential Formulation of the Kinetic Equations
  15. Evolution of Morphology of iPP in Processing Conditions
  16. Regular Contributed Articles
  17. 3D Simulation of Gas Assisted Injection Molding Analysis of Primary and Secondary Gas Penetration and Comparison with Experimental Results
  18. Microcellular Injection Molding
  19. Effect of Material Species on Flash Generation of PPS/GF Composites
  20. PPS News
  21. PPS News
  22. Seikei-Kakou Abstracts
  23. Seikei-Kakou Abstracts
https://doi.org/10.3139/217.1875

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. International Polymer Processing Special Issue Macro 2004
  5. Invited Paper
  6. A Dilatometer to Measure the Influence of Cooling Rate and Melt Shearing on Specific Volume
  7. Monitoring Reactive Processes along the Extruder
  8. Stretch and Shape Distributions of Droplets with Interfacial Tension in Chaotic Mixing
  9. Cast Film Extrusion
  10. Nozzle Injection of Physical Blowing Agents in the Injection Molding of Microcellular Foams
  11. Visualization Analysis of Asymmetric Fountain Flow Phenomenon in Injection Molding of Filler-reinforced Resins by Rotary Runner Exchange System
  12. In-process Monitoring of Micromoulding – Assessment of Process Variation
  13. Processing-induced Properties in Glassy Polymers
  14. Structure Development in Injection Molding: A 3D Simulation with a Differential Formulation of the Kinetic Equations
  15. Evolution of Morphology of iPP in Processing Conditions
  16. Regular Contributed Articles
  17. 3D Simulation of Gas Assisted Injection Molding Analysis of Primary and Secondary Gas Penetration and Comparison with Experimental Results
  18. Microcellular Injection Molding
  19. Effect of Material Species on Flash Generation of PPS/GF Composites
  20. PPS News
  21. PPS News
  22. Seikei-Kakou Abstracts
  23. Seikei-Kakou Abstracts
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