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A Study of Processing Conditions on the Properties of Diffraction Optical Elements by Injection/Compression Molding Process

  • S. C. Tseng and C. L. Liao
Published/Copyright: June 6, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 18 Issue 2

Abstract

The purpose of this work is to develop manufacturing techniques of diffraction optical elements (DOE) and compare the performance of micro injection (/compression) molded products. The DOE mold was fabricated by LIGA-like lithography technique. The optical performance of molded products strongly depends on the replication degree of micro patterns on the surface of DOE. Because of the complex micro patterns on the surface of the DOE, it is very difficult to measure the degree of duplication by traditional microscope measurement like SEM or AFM etc. In this work, a laser computer imaging system was developed to evaluate optical performance of molded parts directly. To achieve better duplication degree and properties of molded DOE, Taguchi's method was employed in the experiments to examine the effects of processing conditions on the performance of molded DOE. Residual stresses of different molded products were measured by a photo-elasticity system. Experimental results reveals that residual stresses of micro injection compression molded elements are much less than those of the micro injection molded ones. This is because compression process provides a higher and more uniform pressure distribution inside the cavity and it can help reduce the unbalanced shrinkage and residual stresses. Compression speed dominates the cavity pressure distribution and becomes the most important factor of final DOE's optical properties.

* 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, ROC
Received: 2003-1-21
Accepted: 2003-2-4
Published Online: 2013-06-06
Published in Print: 2003-05-01

© 2003, Carl Hanser Verlag, Munich

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  1. Editorial
  2. Fourteenth in a Series: Heinz List and his Family of Continuous Mixing Machines
  3. Screw Extrusion
  4. Influence of Non-Newtonian Behaviour on the Processing Characteristics of Wall-slipping Materials
  5. Neural Network Approach to Density Control of Rigid PVC Foam in Extrusion Process
  6. Investigation of Melting Phenomena in Modular Co-rotating Twin Screw Extrusion
  7. Mixing and Compounding
  8. Montmorillonite Co-intercalated with Octadecylamine and Stearic Acid by Low Temperature Melting and its Influence on PP Nanocomposites
  9. Analysis and Optimization of Kenics Static Mixers
  10. Electret-thermal Analysis of Polymer Blends
  11. Effects of Zinc Fatty Acids on Improved Polymer Processing for Critical Extrusions
  12. Flexible Sheet Molding Compound (SMC) Using Aliphatic Polyester as Cross Linker
  13. Co-Extrusion
  14. Investigation of the Interfacial Instabilities in the Coextrusion Flow of PE and PS
  15. Film
  16. Radiant Heating of Plastics: Application to Film Blowing Processes
  17. Injection Molding
  18. Measurement and Prediction of Temperature Distribution in an Injection Molding Cavity
  19. A Study of Processing Conditions on the Properties of Diffraction Optical Elements by Injection/Compression Molding Process
  20. Flow Behavior of Sandwich Injection Molding in Sequential and Simultaneous Injection
  21. Rotational Molding
  22. Rotational Moulding and Powder Processing of Natural Fibre Reinforced Thermoplastics
https://doi.org/10.3139/217.1733

Articles in the same Issue

  1. Editorial
  2. Fourteenth in a Series: Heinz List and his Family of Continuous Mixing Machines
  3. Screw Extrusion
  4. Influence of Non-Newtonian Behaviour on the Processing Characteristics of Wall-slipping Materials
  5. Neural Network Approach to Density Control of Rigid PVC Foam in Extrusion Process
  6. Investigation of Melting Phenomena in Modular Co-rotating Twin Screw Extrusion
  7. Mixing and Compounding
  8. Montmorillonite Co-intercalated with Octadecylamine and Stearic Acid by Low Temperature Melting and its Influence on PP Nanocomposites
  9. Analysis and Optimization of Kenics Static Mixers
  10. Electret-thermal Analysis of Polymer Blends
  11. Effects of Zinc Fatty Acids on Improved Polymer Processing for Critical Extrusions
  12. Flexible Sheet Molding Compound (SMC) Using Aliphatic Polyester as Cross Linker
  13. Co-Extrusion
  14. Investigation of the Interfacial Instabilities in the Coextrusion Flow of PE and PS
  15. Film
  16. Radiant Heating of Plastics: Application to Film Blowing Processes
  17. Injection Molding
  18. Measurement and Prediction of Temperature Distribution in an Injection Molding Cavity
  19. A Study of Processing Conditions on the Properties of Diffraction Optical Elements by Injection/Compression Molding Process
  20. Flow Behavior of Sandwich Injection Molding in Sequential and Simultaneous Injection
  21. Rotational Molding
  22. Rotational Moulding and Powder Processing of Natural Fibre Reinforced Thermoplastics
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