造纸过程成纸质量的单变量统计过程监测研究

Study on Univariate Statistical Process Monitoring of Paper Quality in Papermaking Process

关键词:  统计过程控制  控制图  过程监测  造纸过程

Key Words:statistical process control  control chart  process monitoring  papermaking processes

摘要:研究了休哈特控制图及其改进方法指数加权滑动均值（EWMA）控制图在造纸行业中的应用。收集了国内某造纸工厂2020年9月10—20日共120批胶版纸生产数据，使用训练集绘制胶版纸定量、厚度、白度、松厚度和表面吸水性的休哈特控制图与EWMA控制图，使用验证集验证控制图的准确性。结果发现，休哈特控制图能够及时监测生产中出现的异常并保证成纸质量，而EWMA控制图的监测标准过于严格，实用性不如休哈特控制图。

Abstract:The application of the Shewhart control chart and its improved method， exponentially weighted moving average （EWMA） control chart in the papermaking industry was studied. A total of 120 batches of offset paper production data from a domestic papermaking manufacturer from September 10 th to 20 th in 2020 were collected. The training set was used to draw the Shewhart control charts and EWMA control charts of offset paper basis weight， thickness， whiteness， bulk and surface water absorption. The validation set was used to verify the accuracy of the control charts. As a result， the Shewhart control chart could monitor the abnormalities in the production process and ensure the quality of paper on time. The monitoring standards of the EWMA control chart were too strict， so that its practicality was not as good as that of the Shewhart control chart.