Reducing the Lead Time for Raw Material in the Store Department

Abstract

The case study company aims to reduce the amount of raw materials in stock to support the expansion of production capacity in 2026 due to limited production space. One method is to reduce the time to deliver raw materials to the production department. The main objective is to improve the raw material delivery process to be faster and to support the increase in production capacity. The researchers used the DMAIC Six Sigma principle as the main tool to analyze and solve problems that occur in the process. It was found that there were 11 types of raw materials, divided into 2 periods, from weighing to quality inspection in the system, with an average time of 2,605 minutes, and checking the test results in the database until the raw materials are produced, with an average time of 1,670 minutes. The total raw material delivery time is 4,275 minutes, resulting in having to wait for raw materials in the production process. From the analysis using the Prioritize Matrix tool and the fishbone chart, it was found that the main cause of the delay in raw material delivery is the lack of a standard cycle time for tearing the red part of the QMP document in the raw material warehouse department. Therefore, this research has improved the appropriate work process and arranged a standard cycle time for checking the quality of raw materials. After the improvement, the total material delivery time can be reduced by 1,472 minutes compared to the original working time (4275 minutes), or 34.5% of the time before the improvement. This results in increased efficiency in the material delivery process, reduced material preparation in the warehouse, reduced workload, and increased convenience for employees.