Prediction of Birefringence for Optical Memory Disk
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T. Kanai
Abstract
Polycarbonate (PC) is considered to be a proper resin for optical memory disk, however PC resin shows high birefringence. It is very important to reduce birefringence of PC optical memory disk. This research is to obtain the relationship between birefringence and process conditions and to get the optimum condition for the production of low birefringence substrate of PC optical memory disk. The birefringence distribution of PC optical memory disk was theoretically predicted by the calculations of both the stress distribution caused by molecular orientation during the filling stage and the thermal stress caused by temperature difference during the cooling stage. The relationship between birefringence distribution and the process conditions such as rheological properties of PC resin, injection temperature, mold temperature, mold design and annealing condition is possible to be predicted theoretically by calculating shear stress during the injection process and thermal stress during the cooling process. The predicted results of birefringence distribution qualitatively agree with the experimental ones.
© 1989, Carl Hanser Verlag, Munich
Articles in the same Issue
- Contents
- Contents
- Original Contributions
- Prediction of Birefringence for Optical Memory Disk
- Transient Compressible Flow in Injection Molding Runner**
- Advances in Rheological Analysis of Injection Molding
- Optical and Mechanical Measurements to Characterize Injection Molded Polypropylene Plates
- Experimental Investigation of Rotational Molding and the Characterization of Rotationally Molded Polyethylene-Parts
- Blow Molding of Thermotropic Liquid Crystalline Polymers
- Position of Neutral Surface during Hollow Disk Compression Molding of Long Fibre-Reinforced Thermoplastics**
- Reactive Ion Etching of Polymer Films
- Fabrication of Microstructures of Extreme Structural Heights by Reaction Injection Molding
- Rheological Properties of Glass Fiber Filled Nylon 6 Composite System
Articles in the same Issue
- Contents
- Contents
- Original Contributions
- Prediction of Birefringence for Optical Memory Disk
- Transient Compressible Flow in Injection Molding Runner**
- Advances in Rheological Analysis of Injection Molding
- Optical and Mechanical Measurements to Characterize Injection Molded Polypropylene Plates
- Experimental Investigation of Rotational Molding and the Characterization of Rotationally Molded Polyethylene-Parts
- Blow Molding of Thermotropic Liquid Crystalline Polymers
- Position of Neutral Surface during Hollow Disk Compression Molding of Long Fibre-Reinforced Thermoplastics**
- Reactive Ion Etching of Polymer Films
- Fabrication of Microstructures of Extreme Structural Heights by Reaction Injection Molding
- Rheological Properties of Glass Fiber Filled Nylon 6 Composite System
