The Yarn Analysis System (YAS) test method,developed by Lawson-Hemphill,USA in cooperation with the United States Department of Agriculture (USDA) and Cotton Inc,uses the latest optical digital technology to grade spun yarns.New imaging technology with a precision electronic inspection board offers the most complete and advanced production tool for grading spun yarns.This innovative system is operating successfully in mills and research centres worldwide.The YAS performs a total yarn evaluation,including a complete statistical fault analysis and supporting graphic imagery of the entire tested yarn length (core and hairs),along with a taper board image and fabric simulations.The measurement of variability within a yarn is evaluated as well as the effects of combining other yarns to build a fabric.
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