Consistency control of moisture content in output cut strips from drying process based on double EWMA method

In order to decrease the fluctuation of moisture content in output cut strips from drying process and promote the quality consistency between different processing batches, a control model was established with double exponentially weighted moving average (EWMA) method, and the model was optimized automatically by self-adaptive algorithm. The control system based on the double EWMA method was validated with the online monitoring data of moisture content in dried cut strips for cigarette brand"Huangjinye (Hard Hongqiqu)" in Anyang Cigarette Factory. The results showed that the quality difference between batches caused by the fluctuation of moisture content in output cut strips reduced significantly, the average deviation, extreme difference and mean square error of moisture content in output cut strips decreased by 29%, 2% and 32% respectively; and the process capability index increased by 18%. This method provides a technical support for promoting the consistency of cigarette quality.