engleski

Influence of a Textile Surface Structure on Raster Value Increase in Screen Printing

In this paper, accepted methods of graphic approach to print and printed surface analyses are applied on textile surfaces. Based on dot gain value (DG), indirectly, the influence of specific textile surface structure on color reproduction of CMYK system was pursued, in screen values 0 – 100%. Five textile substrates different in type (cotton, cotton/elasthan, cotton/flax, PES), whiteness and surface structure were tested. In dependence on surface structure of textile samples, different dot gain values (DG) was obtained for all colors of CMYK system. Allowed dot gain as well as allowed tolerances for color parameters for CMYK system, in graphic technology, is set by ISO standard. Although the standard mentioned is applied in graphic technology of paper printing, in this paper it was compared to results obtained for textile samples in aim of detailed analyze and unifying the print quality on textile with other technique of reproduction. In aim of confirming the influence of textile surface structure on dot gain values (DG), the analyze of color parameter obtained by spectrophotometric measurement for each tested surface and each screen value was performed. Results obtained are shown in a*/b* diagram for three basic CMY colors and by relations of lightness L* and chroma C* parameter for each color of CMY system and each surface in defined range of screen values. Also, the color differences between standard and tested samples are obtained, for full printed surface, for each color. Obtained total color difference value (dE), and color parameters difference values (da*, db*, dL*, dC*, dh*) are shown. In paper is confirmed that applying the graphical analytic method allows the possibility of predicting the shifts in color reproduction for tested samples, and also allows the procedure of computer correction dot gain (DG) values in process of pattern screen production, which will assure reproduction of color in satisfactory quality.

Graphical analytic methods in textile printing; CMYK; DG; Colour parameters

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