SUNConferences, 29th Annual Conference of SAIIE

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USE OF MULTIPLE ACTIVITY CHARTS FOR PROCESS IMPROVEMENT IN RUBBER WIRE CABLE MANUFACTURING
Mendon Dewa

Last modified: 2018-10-09

Abstract


Waste reduction becomes an increasingly dominant topic for companies that strive to survive in the modern manufacturing world. This paper applies multiple activity charts for process improvement in rubber cable manufacturing at a case study company. The process is first mapped to outline the basic manufacturing process which included mixing, milling, straining and cooling. Tasks were then categorised as value-adding task, non-value adding but necessary, and non-value added. The non-value adding waiting was noted where the mixer operator waited for the miller operators to complete rolling a batch before mixing a new batch. Two scenario, where mixer waits for miller and where miller waits for mixer, were analysed through the use multiple activity charts. The analysis revealed that the current method employed was unbalanced since more time was wasted in waiting since the mixing time was longer than milling time. It was thus proposed that the mixer operator continuously works while the miller milled the batches as they became available. The mixer waiting time was eliminated as the mixer was continuously loaded, leading to productivity improvement. It was also recommended that the technique of job rotation should be employed due the disparity in workloads for mixing and milling operators.


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