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The Flow Behavior of Core Material and Breakthrough Phenomenon in Sandwich Injection Molding

Part II: Influence of Mold Cavity Thickness and Core Cylinder Temperature
  • D. Watanabe , U. S. Ishiaku , T. Nagaoka , K. Tomari and H. Hamada
Published/Copyright: June 3, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 18 Issue 4

Abstract

The processing conditions that exert influence on the occurrence of breakthrough during sandwich injection molding were investigated. A spiral flow mold mounted on a twin-barrel injection machine fitted with a single nozzle was used. The effect of mold cavity thickness and the effects of skin material cylinder temperature on skin material viscosity, melt strength, and drawing ratio were considered. Scanning electron microscopy was used to study the morphology of the skin material at the flow front. It was found that the flow length at core expansion region increased and breakthrough phenomenon was delayed as the thickness of the mold cavity increased. When cylinder temperature is increased, the viscosity is lowered and the flow front of the skin material extends with greater ease when pushed by the core material, thus, a greater core volume can be accommodated. As the flow front progresses, the tendency is that the skin material becomes thinner. Polishing and etching followed by SEM examination of the skin material at the flow front revealed that the skin material is oriented perpendicular to the flow direction and the extent of orientation increases with increasing cylinder temperature. This further supported the observation that the deformation ratio and drawing ratio increased with increasing cylinder temperature.

* Mail address: U. S. Ishiaku, Advanced Fibro Science, Kyoto Institute of Technology, Matsugasaki, Sakyo-Ku, Kyoto 608-8585, Japan
Received: 2003-4-25
Accepted: 2003-9-9
Published Online: 2013-06-03
Published in Print: 2003-12-01

© 2003, Carl Hanser Verlag, Munich

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  1. Contents
  2. Contents
  3. Editorial
  4. Fourth of a Series: Pioneering Polymer Industry Developments: The First Continuous Kneading Machines
  5. Screw Extrusion
  6. Prediction of Residence Time Distribution in EZ and KE Element of a Ko-Kneader by using CFD Method
  7. Computational Study of Velocity Field in the KE Element of a Modular Ko-Kneader with CFD Method
  8. Optimization of Sweet Bread Dough Processing Conditions by Twin Screw Extrusion
  9. Experimental Development of Processing Technology for Yuba-like Films Using Twin Screw Extrusion
  10. Die Extrusion
  11. Flow Analyses in a Spiral Mandrel Die Assuming Wall Slip
  12. Effect of Elongational Viscosity on the Flow in a Flat Die
  13. Measuring Polymer Melt Density and Viscosity in Real-time during Extrusion Processes using Ultrasound Sensors Fusion
  14. Film
  15. Scale-up Rule for Double Bubble Tubular Process of PA6 Film
  16. Molding
  17. Analysis of the Morphological Development of PBT/ABS Blends during the Twin Screw Extrusion and Injection Molding Processes
  18. Investigation of the Mechanical Properties and Chemical Resistance of PC/PBT/Impact Modifier Blends
  19. Structure Development in Injection Molding of Isotactic Polypropylene, its Blends, Compounds and Dynamic Vulcanizates
  20. The Flow Behavior of Core Material and Breakthrough Phenomenon in Sandwich Injection Molding
  21. The Flow Behavior of Core Material and Breakthrough Phenomenon in Sandwich Injection Molding
  22. PPS News
  23. PPS News
https://doi.org/10.3139/217.1787

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Fourth of a Series: Pioneering Polymer Industry Developments: The First Continuous Kneading Machines
  5. Screw Extrusion
  6. Prediction of Residence Time Distribution in EZ and KE Element of a Ko-Kneader by using CFD Method
  7. Computational Study of Velocity Field in the KE Element of a Modular Ko-Kneader with CFD Method
  8. Optimization of Sweet Bread Dough Processing Conditions by Twin Screw Extrusion
  9. Experimental Development of Processing Technology for Yuba-like Films Using Twin Screw Extrusion
  10. Die Extrusion
  11. Flow Analyses in a Spiral Mandrel Die Assuming Wall Slip
  12. Effect of Elongational Viscosity on the Flow in a Flat Die
  13. Measuring Polymer Melt Density and Viscosity in Real-time during Extrusion Processes using Ultrasound Sensors Fusion
  14. Film
  15. Scale-up Rule for Double Bubble Tubular Process of PA6 Film
  16. Molding
  17. Analysis of the Morphological Development of PBT/ABS Blends during the Twin Screw Extrusion and Injection Molding Processes
  18. Investigation of the Mechanical Properties and Chemical Resistance of PC/PBT/Impact Modifier Blends
  19. Structure Development in Injection Molding of Isotactic Polypropylene, its Blends, Compounds and Dynamic Vulcanizates
  20. The Flow Behavior of Core Material and Breakthrough Phenomenon in Sandwich Injection Molding
  21. The Flow Behavior of Core Material and Breakthrough Phenomenon in Sandwich Injection Molding
  22. PPS News
  23. PPS News
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