The application of 'p' and 'p-CUSUM' charts into textile sector in the statistical quality control process

Abstract

As in every sector, in textile sector, quality is of great importance for consumers and producers. Thus, this study is carried out to increase level of quality. In this study, it is analyzed the errors, the reasons and the results during the production process in a textile company in Denizli. The data on errors are obtained from check reports of the Quality Department. Technical features of production process are presented in control charts. Thanks to data on products in certain and equal time periods, control charts such as 'p' (Defect Percentage of Charts) and 'p-CUSUM' (The Cumulative Sum Of Charts) are used to research whether or not the production is suitable for the standards or desired quality level. Data on production in July 2012-June 2013 are analyzed by comparing different methods. Through the use of two different control charts, it is both compared different methods and obtained feddback about quality level. IBM SPSS Version 21 and Microsoft Excel 2007 programs are used during the prepartion of control charts. Quality control level of error rates is identified as different and inconsistent. In the end of this study, it is appropriate to use both control chart methods together.