An np chart for reducing sustainability cost of monitoring manufacturing processes

Purpose  – This research proposes a model for optimizing the np chart and achieving sustainable monitoring of manufacturing processes. The proposed model incorporates sustainability considerations by minimizing both inspection costs and CO2 emissions.
Design/methodology/approach  – This study presents a model that optimizes the np
chart parameters to minimize the sustainability cost of monitoring manufacturing processes, while ensuring adherence to allowable limits for inspection and false alarm rates. A comparative analysis was conducted with the standard np chart using a case study on fire extinguisher inspections.
Findings  – Results revealed a 69% improvement with the proposed optimal np chart.
Originality/value  – In the literature, statistical monitoring of manufacturing processes has been excessively applied to reduce the variability and associated costs. However, sustainability pillars such as environmental and economic aspects have rarely been considered directly while monitoring manufacturing processes.

Sustainable monitoring, Statistical process control, np control charts, Sustainability cost