Abstract:
This case study reveals the application of theory and industrial engineering in solving the problems occurring in industry, for instance, using the theory of 7 QC Tools together with the theory of New 7 QC Tools, Productivity Improvement and the Theory of Design of Experiment in the last testing process of Inkjet production.
The processes of 2,685,662 printers production from the factory are used as a case study. The finding shows that 2,723 printers which are produced in per month, there are 0.10 % or 452 printers which are the under-standard in the image quality. As the result, the factory has to pay for reworking which cost 45,578 baht or 7,596 baht per month. The study aims to analyze the causes and study the factors which affect to the image quality in the final inspection of inkjet printer production. The study consists of 6 procedures including data collection, data analysis, results, experiments, improvement processes and conclusion. The study is focused on the process of the final inspection of Inkjet production before packaging and delivering to the customers.
The findings show that there are 3 factors which affect to the image quality in the final inspection of inkjet printer production including rubber wheels, code wheel and shaking force while working. After controlling the three factors, the findings mention that the problems of the printers which dont pass the quality control are decreased at 197 printers per month or 0.04% and able to decrease the expense in resolving these problems at average 3,300 baht per month. As the results, the rate of under-standard of quality printers is decreased at 60 % or 50% per month which gives the factorys satisfaction.