Abstract
A uniform application of size on warp yarns is essential to achieve desired weaving efficiency; however, currently no method is available to measure sizing materials on the warp while it is being processed on a sizing machine. A method of on-line measurement of size on the warp using a near-IR diffuse reflectance spectroscopy method is described. A prediction model regression equation is developed using a PLS modeling procedure using a segment of the near-IR spectrum which is most sensitive to changes in size concentration on the warp. A discussion of the identification of the spectral region sensitive to the analyte (partly hydrolysed polyvinyl alcohol) but less sensitive to the substrate (polyester/cotton) is provided.
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