Runner Design to Improve Quality of Plastic Optical Lens

NCUTIR > College of Engineering > Department of Mechanical Engineering > 【機械工程系】期刊論文 > Item 987654321/6985

Please use this identifier to cite or link to this item: http://ir.lib.ncut.edu.tw/handle/987654321/6985

Title:	Runner Design to Improve Quality of Plastic Optical Lens
Authors:	蔡國銘
Contributors:	機械工程(學)系
Date:	2012-03
Issue Date:	2017-12-19 09:57:40 (UTC+8)
Abstract:	Although the layout of multicavity molds is a geometrically balanced design, when the melt flows into the runner, the shear-induced partial changes in material properties will result in intracavity imbalance. This study placed a rectangular flow restrictor within the tertiary runner of a precision optical lens mold to create melt turbulence through flow blocking. Due to polymer rheological characteristics, uniform melt temperature distribution in the runner channel could be obtained, making the temperature distribution inside the cavity more uniform, and reducing the thermal residual stress and warpage of injection molded parts. The optimal runner restrictor design is placing 5 mm away from the secondary runner centerline, making both the depth and the width of the block 3 mm. A relatively uniform melt temperature distribution with a maximum temperature difference of 1.1 °C can be achieved. Injection molds were fabricated according to the optimized restrictor design, and experimental verification was performed. The contour accuracy of a lens parallel to injection direction was improved from 10.44 to 5.03 μm. Therefore, this runner restrictor design can be applied to high-precision optical molds due to the ease of machining and the capability of improving the quality of optical lens.
Relation:	International Journal of Advanced Manufacturing Technology
Appears in Collections:	[Department of Mechanical Engineering] 【機械工程系】期刊論文

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