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Integrated SPC-based scheme utilising variable control charts and C pm ratio to improve manufacturing quality of empty hard gelatin capsules

Author

Listed:
  • Omar Bataineh
  • Abdullah Al-Dwairi

Abstract

Quality control and improvement at the process level is a vital activity for the achievement of quality in products and services. This paper presents a three-phase scheme based on statistical process control methodology that employs variable control charts and process capability indices for quality improvement. The control charts employed are X-bar, s and the exponentially weighted moving average. The centred process capability ratio (Cpm) is employed for process capability assessment. The scheme accounts for both short-term and long-term changes in process performance and it is designed for a structured and less-complex implementation of control charts and process capability assessment. The proposed scheme has been implemented to the manufacturing process of empty hard gelatin capsules as a case study. This implementation has led to an expected reduction in the number of defective capsules by 29% relative to the stage before implementation.

Suggested Citation

  • Omar Bataineh & Abdullah Al-Dwairi, 2012. "Integrated SPC-based scheme utilising variable control charts and C pm ratio to improve manufacturing quality of empty hard gelatin capsules," International Journal of Productivity and Quality Management, Inderscience Enterprises Ltd, vol. 9(3), pages 332-351.
    • Handle: RePEc:ids:ijpqma:v:9:y:2012:i:3:p:332-351
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