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3-D Electronic Imaging of Fabric Qualities by On-Line Yarn Data

This research is aimed at modeling, prediction, imaging and visualization of fabric properties in 2-D and 3-D in accordance with newly defined variance-area curves. The yarn diameter profiles are captured from an on-line measurement system developed within a Lawson-Hemphill CTT. Electronic images are obtained for yarn and fabric quality profiles such as yarn diameter variation, uniformity of fabric surfaces and other physical properties. The variance-area curves have been defined and applied to measure and express the measured fabric qualities in mathematical functions. In addition, we developed a measurement system for obtaining multiple photo images of yarn profiles at different angles along the length of the yarn simultaneously. It was found that, the shape of yarn cross-sections can be approximated by ellipses well with little error. It was also found that the eccentricities or the shapes of ellipse vary along the length of the yarn following a form of statistical distribution. Elliptic approximation of yarn cross-section required the estimation of the major and minor axes and their changes along the yarn length. Furthermore, the angle of the major axes rotated periodically with twists. This discovery allowed us to estimate the number of twists per unit length or the uniformity of twist distribution. The system we developed greatly enhances our capability for imaging and visualization of fabric qualities and provides a means for pinpoint quality mapping for problem isolation required for fabric development. National Textile Center Annual Report: November 2004 NTC Project: S01-NS12 (formerly I01-S12) 2