<![CDATA[Competition in the paper industry requires companies to continuously improve product quality. This study aims to identify the main causes of defects in Duplex Paper Coated (DPC) products at PT. Papyrus Sakti Paper Mill and to develop measurable improvement measures to achieve a sigma level greater than or equal to 4. Based on production data from January to July 2024, the average DPC defect rate was 7.8%, exceeding the company's tolerance of 6%. The Six Sigma approach with DMAIC (Define, Measure, Analyze, Improve, Control) stages was applied, supplemented with FMEA and 5W+1H analysis, to identify the root causes of dominant defects and formulate improvement solutions. The analysis results showed that uneven formation defects were the most dominant type, with the method factor (lack of SOP implementation in the forming process) as the main root cause. An improvement plan was developed using the 5W+1H method and implemented through the creation of new SOPs, operator training, machine recalibration, and process variable monitoring. After the improvements, the process sigma value increased from 4.19 to 4.48, accompanied by a significant reduction in defect rates, thereby achieving the quality target (sigma greater than or equal to 4). This improvement proves that the application of Six Sigma is effective in continuously controlling the quality of DPC products.]]>
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