Integrated SPC-based scheme utilising variable control charts and Cpm ratio to improve manufacturing quality of empty hard gelatin capsules. (1st January 2012)

• Record Type: Journal Article
• Authors: Bataineh, Omar; Al-Dwairi, Abdullah
• Is Part Of: International journal of productivity and quality management. Volume 9:Number 3(2012)
• Page Start: 332
• Page End: 351
• Publication Date: 2012-01-01
• Subjects: SPC -- statistical process control -- control charts -- process capability -- EWMA -- exponentially weighted moving average -- quality control; Quality control -- Management -- Periodicals; Industrial productivity -- Management -- Periodicals; 658.5005
• Languages: English
• ISSNs: 1746-6474

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, 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.