Abstract
The complex research for the changes in the properties of the printing plates’ printing and gap elements influenced by the printing process short runs was conducted, that allowed to determine the change of printing and gap elements’ surface microgeometry, also to determine the change of the oxide layer stability, and to explain the decrease of the ink receptivity coefficient. The mathematical regression equation model of the printing plates’ elements’ impact onto the imprints’ optical density in offset printing was developed, that allows estimating and predicting properties of modern brand of printing plate. Work reveals some new facts about characteristics for printability such as influences of printing plate’s elements parameters’ on color characteristics of imprints. Dampening solution, printing plates application and printing settings as well as color features of the imprints are analyzed in the context of offset printing.
Highlights
In the printing industry the demands to the quality of printed products are constantly increasing, so the solution to ensure stable printing process parameters over the entire printrun is especially important
The conducted research of the printing process impact on change of such important printingtechnical parameters as ink receptivity and ink transfer of printing plates showed that the ink is transferred on the surface of the printing elements in proportion to the amount required for complete saturation in the values set regarding the original thickness of the ink layer (Fig. 4)
There is a descending tendency from 23 to 14 % of the ink receptivity coefficient for the printing plate having been in impression (Fig. 4), that corresponds with the changes of a surface roughness during the printing process because the printing plate saturation occurs with thinner inks layers (Fig. 4)
Summary
In the printing industry the demands to the quality of printed products are constantly increasing, so the solution to ensure stable printing process parameters over the entire printrun is especially important. In the last decade, there are virtually no studies on the current range of printed forms surface interaction with a wide range of the developing and washout substances; the impact of the printing contact parameters and consumables such as inks and dampening solutions on the printing elements properties and on the stability of gap elements is not researched as well. Research in this area reveals the nature and mechanism of these phenomena in printing contact, allowing to develop technological instructions for the rational use of specific modern material types according to the requirements of printed products, while stabilizing their production
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