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Flow Visualization of Filling with Aid of Colored Billets During Impact Micro-Injection Molding

  • S. C. Nian and S. Y. Yang
Published/Copyright: May 2, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 19 Issue 4

Abstract

Injection molding of thermoplastic parts with micro shot-weight has been developed for many Micro-Electro-Mechanical (MEMS) applications. A lab-made high speed impact type micro-injection machine was developed to perform the micro-injection molding. Many phenomena regarding impact micro-injection molding is not clear and needs systematical investigation. In this study, the filling phenomena during impact micro-injection was observed and investigated. Molds of spiral cavity of four different depths were constructed and employed. One side of the cavity was implemented with transparent window to observe the filling, and the filling phenomena were recorded with a high-speed video camera. To aid detailed observation, in the injection sleeve of the machine, sequential transparent and colored billets were inserted. The recorded images of filling flows of the colored melt in the spiral cavity were used for visualization and analysis of the filling with impact-type micro-injection molding machine. It is observed that melt behind from the sleeve will flow through the core of melt ahead and lead the melt front. Fountain flow in high speed micro-injection molding is dominant. During penetration, the colored melt, which is behind the transparent melt originally, is comparatively hot and flows along the core, following the inner side of core to seek shortest flow path.

∗ Mail address: S. Y. Yang, Grace Laboratory for Polymer Processing, Dep. of Mech. Eng., National Taiwan University, Taipei, Taiwan, R.O.C. E-mail:

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Received: 2004-4-16
Accepted: 2004-11-18
Published Online: 2013-05-02
Published in Print: 2004-12-01

© 2004, Carl Hanser Verlag, Munich

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Polymer Processing Society at 20
  5. Mixing and Screw Extrusion
  6. Index for Simultaneous Dispersive and Distributive Mixing Characterization in Processing Equipment
  7. Determination of the Residence Time Distribution in Twin Screw Extruders via Free Radical Modification of PE
  8. On-line Visualization of PS/PP Melting Mechanisms in a Co-rotating Twin Screw Extruder
  9. Die Extrusion
  10. Influence of Filler Particle Geometry on Die Swell
  11. Reactive Processing
  12. Side Chain Extension of Maleated Polypropylene with Diamine
  13. Reactive Batch Mixing for Improved Silica-Silane Coupling
  14. Studies on NBR-ZDMA-OMMT Nanocomposites Prepared by Reactive Mixing Intercalation Method
  15. Fiber and Film
  16. High-speed Melt Spinning of Polyethylene terephthalate with Periodic Oscillation of Take-up Velocity
  17. A Constitutive Analysis of Extensional Flow of EVA Nanocomposites
  18. Laser Sintering
  19. Laser Sintering of High Temperature Resistant Polymers with Carbon Black Additives
  20. Molding
  21. Flow Visualization of Filling with Aid of Colored Billets During Impact Micro-Injection Molding
  22. Modelling of Cyclic 3-Dimensional Heat Transfer in Injection Moulding
  23. PPS News
  24. PPS News
https://doi.org/10.3139/217.1841

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Polymer Processing Society at 20
  5. Mixing and Screw Extrusion
  6. Index for Simultaneous Dispersive and Distributive Mixing Characterization in Processing Equipment
  7. Determination of the Residence Time Distribution in Twin Screw Extruders via Free Radical Modification of PE
  8. On-line Visualization of PS/PP Melting Mechanisms in a Co-rotating Twin Screw Extruder
  9. Die Extrusion
  10. Influence of Filler Particle Geometry on Die Swell
  11. Reactive Processing
  12. Side Chain Extension of Maleated Polypropylene with Diamine
  13. Reactive Batch Mixing for Improved Silica-Silane Coupling
  14. Studies on NBR-ZDMA-OMMT Nanocomposites Prepared by Reactive Mixing Intercalation Method
  15. Fiber and Film
  16. High-speed Melt Spinning of Polyethylene terephthalate with Periodic Oscillation of Take-up Velocity
  17. A Constitutive Analysis of Extensional Flow of EVA Nanocomposites
  18. Laser Sintering
  19. Laser Sintering of High Temperature Resistant Polymers with Carbon Black Additives
  20. Molding
  21. Flow Visualization of Filling with Aid of Colored Billets During Impact Micro-Injection Molding
  22. Modelling of Cyclic 3-Dimensional Heat Transfer in Injection Moulding
  23. PPS News
  24. PPS News
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