Open AccessColour quality testing of CYAN offset prints depending on pigment concentration and different CTP screening mode
Author(s) -
Sandra Mustač,
Igor Majnarić,
Stanko Bauk,
Slaven Miloš
Publication year - 2020
Language(s) - English
Resource type - Conference proceedings
DOI - 10.24867/grid-2020-p47
Subject(s) - cyan , inkwell , gloss (optics) , magenta , offset printing , materials science , pigment , composite material , optics , computer science , chemistry , physics , organic chemistry , coating
One of the problems in the offset printing technique is the picking of uncoated paper, which occurs due to the activity of pressure cylinder and sticky offset inks. To reduce offset ink stickiness, it is possible to add cheaper ink filler that will indirectly reduce the concentration of pigment. However, there is also a reduction in the colour tones and quality of reproduction. In this experiment we used: standard cyan offset ink (Sun Lit Express ink which consists of phthalocyanine based pigment) and high-quality gloss coated cardboard (250 g/m2 Euroart plus gloss). This paper aims to show how the CTP screening type (AM/FM mode) and the CTP line screening (80, 100, 120 line/cm and 10 μm, 20 μm 25 μm diameter of print elements) manifest on the reproduction quality of a standard gradation wedge. This research will create the possibility of correlating the factors of user reduction of pigment concentration and reproduction quality of cyan colour separation. By using the AM screenings and adding different concentrations of ink filler, more stable cyan prints are achieved.