การลดเวลารอของสินค้าคงคลังระหว่างกระบวนการผลิต โดยการใช้เทคนิคลีน

Abstract

The study aimed to solve a problem in a glass substrate manufacturing factory. The study requires a decrease of inventory waiting time during work in process between the A Department and the B Department. From the study, it was found that the inventory waiting time caused a reduction of yield in the last checking Department. The reduction of yield affected the total yield causing it to become lower. This study proposes a reduction in inventory waiting time during work in process by using Lean Technique. The researcher implemented the Lean Technique. A Work Flow Chart and Value Stream Mapping were written and it was identified that the waiting time resulted in increasing the length of work flow time. The cause was found to be at the Exchange Room where products were moved. An analysis of the cause and possible solutions were made using the Cause and Effect Diagram. It was shown that the problems arose from having too many sub-tasks in order to change the cart; the rate of production for each sub-task were not in sync; moving equipments were not suitable; there was no audit system to check inventory number at the production site and the Production Planning Department were not aware of the level of stock that is being produced. After the study, improvement to the audit system for the level of stock was made to be “Real Time”. Also, improvements were made when the Production Planning Department orders the production to match with the amount of stock left. The manufacturing steps between the A Department and the B Department were decreased.