CUSUM and EWMA Charts for Textile Process Monitoring
topic
Cumulative sum charts accumulate deviations of individual measurements from target to detect small sustained process mean shifts more sensitively than Shewhart charts, while exponentially weighted moving average charts apply geometric weighting to historical data, both methods providing superior detection of gradual drift in yarn evenness, dye bath pH, and finishing chemical concentration.
Role
Supplements Shewhart charting in applications where small sustained shifts rather than large sudden changes are the primary process failure mode, particularly valuable for monitoring gradual machine wear, dye bath depletion, and slow temperature drift in continuous textile finishing operations.