Details:
Summary:
The rapid development in the electronic-computer technology has caused to rapid increasing software and hardware production in the printing sector. The CtP, a plate preparation technique without using a film is one of the most important developments for the last decade. Using this technique is important since CtP minimises the duration passing from the pre-printing operation to final printing process and it also lovers printing costs. However, CtP users have not yet solved the application problems related to exposure equipments produced by different companies and their working principles are not clearly understood. There are also some lack of technical knowledge. In addition, one of the issue in question is which plate product would give the high quality printing. The main purpose of the present study is to investigate the differences between plates by using test prints. In this study, first a test print original was prepared for the use of in the printing step, consisted of CMYK color. On this original, there are an UGRA 82 printing control scale, a plate control strip and also a scala which has a tram dot density of 1-100 % in CMYK colors. The prepared original was exposed into conventional plate, thermal and violet plates with development. A print into 170 g/m2 gloss paper was in the same physical conditions using Heidelberg Speedmaster. The dot gain, density and trapping values were again measured during the printing, just after the printing and 1 hour and 24 hour after the printing. At the end of these measurements, the data obtained were evaluated.