engleski

THE SIMULATION OF THE GRAPHIC REPRODUCTION ENVIRONMENT IN LABORATORY SURROUNDINGS

Devices which can in a laboratory environment simulate the real reproduction conditions have been developed in order to indicate the quality of the finished product in advance, prior the real reproduction. In this paper, by using a laboratory offset device the real reproduction environment will be simulated. Evaluation and comparison of printed sheets made in laboratory and real production conditions will define the possibility of the usage of the laboratory equipment for testing the relevant parameters in real offset process. In the first stage, CtP printing forms with characteristic wedge will be made in order to measure the quality of the printing forms. For a characterization of reproduction possibilities, various screening methods will be used, including two frequencies. In the second stage, prints will be made in the real graphic production environment and by using a laboratory device. Moreover, coated and uncoated papers, two most common types of printing substrate in real offset environment will be used. Based on the results, the possibility of simulation of the real production environment in laboratory conditions will be presented. The tone reproduction curve will be made in order to define the amount of dot gain in the laboratory and real conditions. It will ensure the possibility of finding a functional dependence between results measured on printed sheets obtained in real and simulated printing conditions. Moreover, results will show the applicability of the laboratory simulation reproduction process. Additionally, the obtained results will be used as a reference for dot gain compensation plate curve calculation in the CtP system. By defining the compensation curve in a laboratory environment, the cost of its evaluation in the real reproduction process will be significantly reduced, which would increase the total efficiency of the printing system.

printing forms; offset lithography; simulation; real reproduction conditions; laboratory conditions

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