Statistical Quality Control for Hand Tufted Carpet Process : Case Study in Carpet Factory

Abstract

This research is aimed to analyze the effect of factors in hand tufted carpet process. The category 3 carpet is the main product of the case study factory and has the most fiber loss. In analyzing and studying factors which effect fiber loss in carpet tufted process by analysis of variance. comparison test and regression analysis. Show that inappropriate tufted gun speed and the inappropriate number of stitch per 5 centimeter made significantly the carpet density above the carpet production standard as 2.44 kilogram per square meter. The appropriate range of tufted gun speed and the appropriate number of kilogram per square meter. The appropriate range of tufted gun speed and the appropriate number of stitch per 5 centimeter are 1001-1200 round per minute and 1291 stitch per 5 centimeter respectively. From the resift. Mean and range control charts (x and R charts) of the number of stitch per 5 centimeter are created to control carpet density. Implementation by appropriate tufted gun speed and control charts can reduce fiber loss from 0.05 to 0.03 kilogram per square meter or reduced 40% of loss and increase the process capability. The potential capability index (C_p) and potential capability ratio (C_R) are improved from 0.60 and 1.67 to 1.04 and 0.96 respectively. The result illustrates that process can be detected effectively, The probability of undetection within 3Ợ changing of mean and range in production process. Are 0.054 and 0.015 respectively. As the result in summary, carpet qualities are improved.