Productivity Improvement by Using Design of Experiment: Case Study of Cotton Bud Factory in Khonkaen Province

Abstract

This research used a design of experiment to optimize production process factors 1n Cotton Bud

factory of a case study 1n KhonKaen province. By focusing on the causes of defect, broken slidver is the most importance cause which leads to decrease the production effic1ency 1n the case study factory. Therefore why-why analys1s is used in this research to find the factors that cause slidver breaking, which leads to defect. There are three ma1n factors: Machine rate, slidver thickness and the gap between slidver and the machine

that lead to defect. The results of the research shows that the optim1ze factors to operate are:

- Adjust the production rate to 1300 pieces per minute

- Sett1ng slidver thickness to 1.4 gram per meter

- The gap between slidver and machine 20 centimeter. Finally, we can conclude that proposed method ables to decrease cost of defect by 35%