Abstract
In order to achieve high-quality colour prints by using an electrophotography printing machine, it is necessary to prepare the printing substrate. Additional treatment may be needed to achieve the better substrate surface tension for optimally attaching the liquid electrophotography ink to the fine art paper. To ensure good adhesion of the ink to the printing substrate, a pre-treatment by application of surface tension regulating fluids (priming) may be used. In this paper, we will determine the possibility of realization of the CMY prints and the possibility of achieving an increased range of tone value in electrophotography digital printing. Based on the results, the new possible values of reproduced CMY tones will be determined so that a higher print quality can be achieved. The application of primers changes the optical properties of the paper printing substrate, which directly affects the colour reproduction. An additional 100 % increase of primer application will result in total colour changes of ΔEC (0,5g/m2 & 1g/m2) = 0,06, ΔEM (0,5g/m2 & 1g/m2) = 0,42, ΔEY (0,5g/m2 & 1g/m2) = 0,08. In this scenario, 1 g/m2 application of primer will produce the most intense full tones and therefore the highest quality prints for all three ElectroInk process colours.
Highlights
In order to achieve uniform and well-defined surface properties, it is necessary to treat the surface with certain substances
The reproduction curves created by applying a different amount of primer completely realize colour changes (ΔE), which is true for all experimental samples tested
The aim of this research was to define the effect of refinement of the printing substrate by the method of application of fluid to regulate the surface tension of the printing substrate
Summary
In order to achieve uniform and well-defined surface properties, it is necessary to treat the surface with certain substances Most commonly these are acrylic polymers, vinyl ether polymers, polystyrene butadiene, polyesters, alkyd resins, phenolic resins, vulcanized thermoplastic elastomers, olefin thermoplastic elastomers, EVOH (ethyl vinyl alcohol copolymer) resins, polyvinyl chloride, resin oils, waxes [1]. Depending on the aggregate condition of the printing media, the production speed and the thickness of the coating, different coating methods are applied - coating performed by pouring, direct immersion of the material in the coating, application through a narrow crack (extrusion), application with chamber squeegees, application by Mayer rod All of these procedures are based on the principle of uniform application with 100 % coverage of the surface. The realized coating thicknesses can be different, depending on the coating techniques, ranging from 3 to 300 g/m2 [3]
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