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Production of Security Printing by Means of Themochromic and Conventional Offset Inks
Authors: Panák Ondrej | Syrový Tomáš | Szöllösiová Linda
Year: 2012
Type of publication: článek ve sborníku
Name of source: Proceedings of GRID 2012
Publisher name: Univerzitet u Novom Sadu
Place: Novi Sad
Page from-to: 77-84
Titles:
Language Name Abstract Keywords
cze Tvorba obrazců bezpečnostního tisku pomocí konvenčních a termochromních barev Cílem práce bylo připravit bezpečnostní obrazce, kde jedna část je tvořena přetiskem konvenčních barev a termochromní barvy, a druhá část je vhodnou CMY kombinací. Pro dosažení stejného vzhledu obou částí obrazce bylo využito Neugebauerovho modelu. termochomizmus; Neugbauerův model; barevné simulace
eng Production of Security Printing by Means of Themochromic and Conventional Offset Inks The aim of this work was to create patterns consisting of two parts. One part is a selected combination of CMY frational area coverage with full overprint of thermochomic (TC) offset ink and second part is a computed CMY simulation to match the first part in colour appearance. As first, different binary combinations of C, M, Y were printed with overprint of TC ink with full area coverage. The patches were measured by spectrophotometer to obtain reflectance spectra and consequent colorimetric parameters. To be able to simulate the overprints with TC ink just by CMY combination, simple colorimetric Neugebauer model, simple spectral Neugebaur model, and also their Yule-Nielsen modifications were used. By iteration techniques, fractional area coverage of CMY simulations was obtained. In second step, security patterns consisting of CMY combination with TC ink overprint and their computed simulation were printed and evaluated in terms of colour difference. For the study coated and uncoated paper and two TC inks (green and red) were used. The results show, that spectral Neugebauer model with Yule-Nielsen modification was in average the best predicting model in case of uncoated paper. The results for coated paper show, that simulations computed by simple colorimetric Neugebauer model resulted in lowest colour difference. However, the colour differences of simulations were above 4, regardless of computing method of CMY dot area coverage of the simulation. thermochromic; Neugebauer model; colour simulation

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