Paper Title:

Glass-Mold Defective Reduction in Plastic Lenses Manufacturing Process Using Six Sigma Approach

Periodical Advanced Materials Research (Volumes 156 - 157)
Main Theme Advanced Manufacturing Technology
Edited by Jingtao Han, Zhengyi Jiang and Sihai Jiao
Pages 1598-1602
DOI 10.4028/www.scientific.net/AMR.156-157.1598
Citation Napassavong Rojanarowan et al., 2010, Advanced Materials Research, 156-157, 1598
Online since October, 2010
Authors Napassavong Rojanarowan, Teeraporn Senprom
Keywords Attribute Response, Defective Reduction, Experimental Design, Plastic Lens, Scratched Mold, Six Sigma
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Abstract

This research aims to demonstrate Six Sigma methodology to reduce defective rate. A case of glass-mold defective reduction in plastic lenses manufacturing was studied. After applying systematic DMAIC steps and statistical tools suggested by Six Sigma approach, it was observed that the defective rate due to scratched molds was decreased from 2,512 ppm to 826 ppm, and the sigma level was improved from 4.31 to 4.65. In addition, the improvement could save the production cost up to 75,000 USD annually.