Type of Document	Dissertation
Author	Kurgatt, David K.
Author's Email Address	dkk06@fsu.edu
URN	etd-11102010-220520
Title	Optical Spun Yarn Diameter: On-line Control and Analysis of Count
Degree	Doctor of Philosophy
Department	Retail Merchandising and Product Development, Department of
Advisory Committee	Advisor Name Title Mary Ann Moore Committee Chair Elizabeth Goldsmith Committee Member Jeanne Heitmeyer Committee Member Pauline Sullivan Committee Member Eric K. Chicken University Representative
Keywords	On-line Method Comparison Optical Diameter Spun Yarn Fiber Volume
Date of Defense	2010-10-11
Availability	unrestricted
Abstract The purpose of this study was to develop a new methodology of on-line optical spun yarn count analysis and control (OYCA) by use of on-line optical yarn diameter measurements and to carry out method comparison study against the ASTM D 1907 – 89. The result of the study showed sufficient agreement between OYCA and the ASTM D 1907 – 89. Inter-plant comparison of method difference was not significant, which is an indication of the robustness of OYCA across plants with similar technologies and process parameters. Significant predictive relationship between optical yarn volumes (OYV), twist and linear density was demonstrated by a factorial experiment where factors of twist and linear density were set at high and low levels of ±10 % augmented by center points from regular production set up. Optical fiber volumes in skeins were verified using gas pycnometer volume measurements. Significant correlation r (60) = 0.96, p<.01 between fiber volume and OYV was observed. Altman-Bland (1986) test of agreement showed a consistent bias of -0.55. The bias observed was attributed to lower estimation of fiber volume fraction (FVR) and more light transmission through the yarn structure. In practice, the magnitude of the bias observed was not significant and hence The ASTM D 1907 – 89 and OYCA methods exhibited sufficient agreement in spun yarn count analysis.
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