Regularities Of Stability For Printing Forms Of Offset Printing With Dampening In Short Runs

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

Ranking of Technologically Significant Factors Determining the Quality of Reproduction of Augmented Reality Elements

The work is devoted to the study of factors influencing the reproduction of augmented reality elements. The object of the study is technologically significant parameters of the influence on the process of reproduction of AR elements when pointing a phone or tablet camera at a special marker image. The main problem of the study is the lack of information regarding the technological process of creating AR products and a large number of parameters that should be taken into account when choosing a particular technological operation, since changes in these factors greatly affect the correct reproduction of AR elements and further use of such products. The study determined that in recent years, research has shifted from the field of science to printing and entertainment. This is due to the capabilities of the technology, namely wow effect, content expression, ease of creation, etc., development of digital technologies and competition with digital products. Also, a low level of research was revealed in the area of products with unstable usage conditions such as clothing, packaging, etc. This can be explained by the development of printing technologies and opportunities in this area only recently, the increase in the popularity of such products only in recent years and, as a result, insufficient knowledge in this area. However, such products are much more popular in the market, which is emphasized by a significant drop in the production of books, magazines, etc. The results of studying the significance of factors in the marker reproduction processes made it possible to identify the most significant ones (marker parameters, material characteristics, usage conditions, etc.). A systematic and integrated approach to the influence factors of this study allows the development of methods for normalizing the process of creating AR products with unstable usage conditions, which makes it possible to produce workable and reliable products in any conditions

Influence of the Surface Characteristics of Corrugated Cardboard on the Quality of Inkjet Printing

This paper investigates the quality of inkjet printing on corrugated cardboard with various characteristics such as the presence of surface coating, the type of cardboard structure, the corrugated layer profile, and the corrugated cardboard height. The color characteristics of the corrugated board surface of studied samples were analyzed in the CIE Lab system; the value of the discrepancy in the shade of white was established when compared with the reference values of the ISO 12647 standard. During the study, the main criteria for assessing the quality of color reproduction of inkjet imprints were analyzed: an indicator of the general contrast level (K), the value of color differences for the basic tone shades (ΔE), and the volume of the body color coverage (ΔE2). It was found that when printing on various types of corrugated cardboard, there is a general decrease in the overall contrast value. The actual level of color differences is ΔE=10...45 and exceeds the permissible standards for the color reproduction quality. This adversely affects the reproduction of different color tones in the printed image. In general, the quality of color reproduction differs for the test samples of corrugated cardboard in terms of the magnitude of the spread in the values of color distortions on the tone shades. The influence of the main characteristics of the investigated samples of corrugated cardboard on the quality indicators of inkjet printing has been analyzed. In particular, a significant influence of the index of color characteristics of the surface of corrugated cardboard L* and the type of corrugated board structure on the quality of color reproduction has been established. The study results reported here could make it possible to reasonably approach the selection of the corrugated board structure that is optimal in composition, increase the productivity of the technological process for manufacturing containers, and stabilize the quality of printing on corrugated cardboar