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Abstract     In practice it happens very frequently that yarn of certain fineness, which creates desired   colour effect on the woven fabrics surface, is not available. In consequence an available   yarn of different fineness has to be used instead, which can be observed on the woven   fabrics as a colour deviation compared with the desired effect. The aim of this research is   the possibility of colour values corrections of woven fabrics by changes of constructional   parameters. Simulations of woven fabrics are used for this purpose. In the case   described weft the yarn of higher fineness is substituted by the yarn of lower fineness and   equal colour values. Three possible ways of colour values correction by changes of   constructional parameters of the woven fabric are presented. In the first case, the colour   difference is corrected by increase of the weft threads density, the second way of   correction consists in the change of warp yarn fineness, and the third in decreasing of   warp threads density. The basic purpose of all the three types of correction is the equally   change of warp and weft contents in one colour rapport of the woven structure. In the   experimental part of our work, the colour values L*, a* and b*, and colour differences   DE*ab are investigated theoretically (using calculations on the basis of theoretical defined   fractions, and L*, a*, and b* values of yarns), as well as spectrophotometrically, on the   basis of printouts of simulations of woven fabrics prepared with the use of Arahne CAD   system. Two ways of determination of colour values of simulations and three types of   corrections are evaluated in the conclusions. It was find out that the correction with the   increase of weft thread density is the most successful, and the DE*ab values are minimal.

CORRECTION OF COLOUR VALUES OF WOVEN FABRICS USING CHANGES TO CONSTRUCTIONAL PARAMETERS