Owolabi, C. TAbdulkareem, SulaimanAjiboye, T. K.Akande, K. A.Ahmed, Ismaila Idowu2021-05-072021-05-072016Owolabi, C. T., Abdulkareem, S., Ajiboye, T. K., Akande, K. A., & Ahmed, I. I. (2016). Quality Improvement in PVC Industry Through Six-Sigma Analysis of Machine Process Parameters. Paper presented at the International Conference of Mechanical Engineering, Energy Technology and Management, Ibadan.https://ui.edu.ng/content/mechanical-engineeringhttps://uilspace.unilorin.edu.ng/handle/20.500.12484/5167Six-sigma is an organised and systematic method for strategic process improvement that relies on statistical and scientific methods. In the present work six Sigma methodology was adopted to reduce defect rates and achieve significant quality up-grade in a PVC pipe manufacturing industry. Taguchi method of experimental design was applied for optimization of the process, quality and performance output of manufacturing process. The cause and effect diagram was implemented to identify the root cause of the defects resulting in poor product quality. From the analysis, the major root causes of defects were the process parameters- the vacuum pressure, temperature and take-off speed. Applying Taguchi method of experimental design for process parameter optimization, the process resulted in more superior quality. An estimated cost loss improvement of 37% was achieved and Part Per Million defects reduced from 67,487 to 20,503.enDefectsDesign of experimentProcess parameterSix SigmaTaguchi methodProduct qualityArticle