Improving Quality of Recycled Plastic Products

Abstract

Plastic parts in electric device manufacturing of fluorescent bulb kit do not meet the customer's satisfaction because of their defects, low strength, and low heat resistance. This research aims to improve the quality of plastic parts by Implementing six sigma. Six sigma has evolved into a statistically oriented approach to process and product quality improvement. Six sigma approach has five steps consisting of define phase. measure phase. analyze phase, improve phase, and control phase (DMAIC process). By following the five step-s1x sigma process of DMAIC, mixture experiments and response surface methodology are employed in the study. The optimal setting conditions of plastic mixtures of recycled and virgin polycarbonate are determined for maximum mechanical property and thermal property of injection molded plastic parts. This research has shown that design of experiments and response surface methodology in conducting six sigma analysis improve the quality of plastic parts based on mechanical and thermal characteristics of recycled plastic products.