KEYWORDS: Printing, Color, Absorbance, Color reproduction, Packaging, CMYK color model, Visualization, Color normalization, Viscosity, Standards development
A wide range of consumables and equipment, high requirements for the quality of printed products, the use of triad and mixed inks in flexographic printing, lead to the need to carry out thorough incoming control of new raw materials and conduct test printing, obtain a reference print before starting the run. In this regard, the research of color formation in the "printing form-imprint" system when using new consumables for flexographic printing in the technological process is always an urgent task. Prints from a real order were selected for the study. Profiles printed on various non-sticky printed materials and samples of flexible packaging were used as test fragments. Visually and instrumentally, the stability of color reproduction during flexographic printing of flexible packaging and labels was investigated. The dependence of the saturation of CMYK and Pantone colors on the print on the printed materials used and the presence of a white substrate was determined. The pre-printing of non-woven material with white ink affects the subsequent color saturation indicators on the print and improves the color characteristics.
The article is devoted to the study of complex technological environment interference parameters printed contact and method of stabilization for the normalization of color reproduction images of porous and non-adsorbent materials. There were grounded technological parameters stable color reproduction by minimizing the ratio ink transferring on non-adsorbent and porous materials. There were developed for a special purpose additions to regulate the offset printing process and method of their leading into the technology environment and its control that allows to improve the quality of printed production. Effect of technological environment components for color reproduction stability were determined. Measurements of the imprint's optical characteristics such as the reflectance spectra were taken depending on the inks and substrate.
The interaction of non-absorbent materials (PVC, PS, films etc.) with the testing inks was researched. Measurements of the imprint's optical characteristics were taken depending on the inks and substrate and its morphology. The research of mentioned parameters is required while creating absolutely new materials to be a printing surface and testing system "printing material-ink". These measurements allow determining the possibility of current existing materials use in a particular technological process of printing. The relationship between printed surface wetting and its technical-printing parameters is determined. The interaction of the ―printed surface - ink‖ system is predicted. The component pairs mutual influence onto the printing process is determined. The possibility to ensure the normalized color difference and optical characteristics of imprints was taken into account.
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