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All Journal IJENSET
Charismanda Adilla Tristanto
Universitas Muhammadiyah Lamongan
Automotive Engineering Biochemistry, Genetics & Molecular Biology Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Quality Control Using the Six Sigma Method to Minimize Damage to Type 2268.2 Jars at PT X Charismanda Adilla Tristanto; Muhammad Sufyan Tsaury; Raiza Ika Febriana
Indonesian Journal of Engineering, Science and Technology Vol. 3 No. 1 (2026): VOL. 03 NO. 01 (JUNE 2026)
Publisher : Universitas Muhammadiyah Lamongan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.38040/ijenset.v3i1.1482

Abstract

PT X is a plastic jar manufacturing company that produces 14,000 jars per day using 12 machines. A recurring problem is the high number of defective products, which makes lid-to-body assembly difficult. This study aimed to identify the causes of defects and recommend quality improvements using the Six Sigma method. The results showed that the most frequent defects were falling breakage (1,004 cases) and ejection defects (712 cases). Statistical control values (CL, UCL, and LCL) were still within control limits, while the cause-and-effect analysis indicated that human factors were the main source of defects. The key improvement priorities are strengthening SOP implementation and providing better training on injection machine operation. Although the sigma level of 4.1 indicates fairly good performance, quality improvement remains necessary to enhance productivity.
Co-Authors Muhammad Sufyan Tsaury Raiza Ika Febriana