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A New Design Method to Improve Flow Uniformity in a Reaction Injection Mold Entry

  • Y. C. Hsieh , L. L. Chen and S. C. Tseng
Published/Copyright: May 2, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 19 Issue 1

Abstract

Reaction injection molding involves the injection of two or more kinds of liquid polymers into a mold at relative high speed. Such high inertia effect may result in air pocket inside the mold or non-uniform velocity distribution. How to design the mold entry geometry to provide uniform velocity distribution becomes one of the major topics in reaction injection molding process. Thus a new and simple method was developed in this work to optimize the reaction mold entry design. Several regulation islands were located in a fish tail entrance to help distribute the flow more even. Dimensions and locations of the islands will affect the flow uniformity and become the factors to be optimized. Taguchi's design of experiments coupled with computer flow simulation was used to achieve die geometry optimization. Effects of different dimensions of the islands on the flow uniformity can also be evaluated through statistical analyses in the flow simulation. Flow visualization technique was done by capturing flow images with high speed CCD. The experimental results showed very good agreements with the Fluent simulation results. The design methodology proposed here can help the molders in designing different reaction injection mold entries for better uniformity and performance.

∗ Mail address: S.-C. Tseng, Department of Mechanical Engineering, National Yunlin University of Science and Technology, 123 Sec. 3, University Avenue, Touliu, Yunlin 640, Taiwan, R. O. C. E-mail:

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Received: 2003-4-24
Accepted: 2003-10-9
Published Online: 2013-05-02
Published in Print: 2004-03-01

© 2004, Carl Hanser Verlag, Munich

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  5. Prediction of Residence Time Distribution for Different Screw Configurations of a Ko-Kneader by using a Cluster Model
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  11. Impact Strength of β-Nucleated Polypropylene
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  14. Thickness Uniformity of Double Bubble Tubular Film Process for Producing Biaxially Oriented PA 6 Film
  15. Bowing Phenomenon in Double Bubble Tubular Film Processing for PA 6
  16. Molding
  17. A New Design Method to Improve Flow Uniformity in a Reaction Injection Mold Entry
  18. Three Dimensional Analysis of Shape Deformation in Injection Molded Optical Lens
  19. Development of a Hybrid Solid-Microcellular Co-injection Molding Process
  20. PPS News
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https://doi.org/10.3139/217.1804

Articles in the same Issue

  1. Contents
  2. Contents
  3. Screw Extrusion
  4. Physico-Mathematical Model for the Description of the Temperature Development and the Power Consumption in Co-Rotating Twin Screw Extruders
  5. Prediction of Residence Time Distribution for Different Screw Configurations of a Ko-Kneader by using a Cluster Model
  6. Die Extrusion
  7. In-line Monitoring of PVC Melt Viscosity Using Dielectric Measurements
  8. Die Wall Effects, Contact Angles and Slippage in the Flow of Polymer Melts and Polymer-Particulate Compounds with Carboxylic Acids in a Slit Die
  9. Crystallization
  10. Fractionated Crystallization and Morphology in Binary Blends of Isotactic PP and HDPE with Cycloolefin Copolymers
  11. Impact Strength of β-Nucleated Polypropylene
  12. Film
  13. Extensional Rheology of Polypropylene in Relation to Processing Characteristics
  14. Thickness Uniformity of Double Bubble Tubular Film Process for Producing Biaxially Oriented PA 6 Film
  15. Bowing Phenomenon in Double Bubble Tubular Film Processing for PA 6
  16. Molding
  17. A New Design Method to Improve Flow Uniformity in a Reaction Injection Mold Entry
  18. Three Dimensional Analysis of Shape Deformation in Injection Molded Optical Lens
  19. Development of a Hybrid Solid-Microcellular Co-injection Molding Process
  20. PPS News
  21. PPS News
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