Influence of different factors and modifying additives on the printing ink layer properties
AbstractThe presentation will be concerned with analysis of the impact of various factors on the quality of print reproduction in offset and flexographic printing with water-based inks. It is concerned with the variations of print optical properties occurring on the prints during print abrasion and fading processes caused by exposure to daylight and ink penetration into the printing substrate. Since water-based inks are environmentally friendly, inexpensive, non-flammable, work friendly etc. Despite these advantages they are not widely used, as they can cause some problems in printing process. High surface tension of water-based flexographic inks significantly reduces their adhesion to plastic substrates. Their adhesion is much lower than that of other inks used in this printing technology. Research on the quality of water-based flexographic inks may contribute to popularization of these environmentally friendly inks in flexographic printing. For this reason it is important to investigate some properties such as ink adhesion to the printing substrate or ink resistance to abrasion processes. Also the light fastness testing of prints made with water-based flexographic inks or offset inks is of great importance for obtaining high quality printing. The influence of modifying additives or surface protection on listed properties in offset and flexographic printing will be analyzed.
|Book||Gajadhur Marta (eds.): Cost Training School – Printing of bio-based materials in packaging, 2013|
|Keywords in English||offset printing, flexographic printing, lightfastness, abrasion resistance, colour coordinates, process colours, spot colours|
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