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Process Capability of the Zellweger 900-Automatic with Dual Color Heads: A Comparison of 1994 and 1995 Results

Garry L. Lewicki, Mary H. Fairley


Process capability analysis was performed on newly purchased Zellweger model 900-Automatic High Volume Instruments with dual color heads in 1994 and 1995 using the same methodology for the fiber properties of micronaire, strength, length and uniformity. The results from the two years were compared. Improvements in the Cp and Cpk indices and in the ratio of the Cpk index to the Cp index were seen despite little or no decreases in measurement variability. This is due to a decrease in the variability between instruments.

Reprinted from Proceedings of the 1996 Beltwide Cotton Conferences pp. 1265 - 1268
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998