3.01. Colour control with dual separation for daylight and daylight / infrared light
Ivana Žiljak(1), Jana Žiljak Vujic(2), Klaudio Pap(1)
(1) Faculty of Graphic Arts
Getaldiceva 2, 10000 Zagreb, Croatia
(2) Polytechnic of Informatics and Design
Vrbik 8, 10000 Zagreb, Croatia
Security graphics is an area that requires research and continuous development. The goal is to obtain top-quality security through design, individualization and innovations in graphic technology. In practice up to date security graphics have developed by applying special toners or extreme printing techniques reserved only for security printing, as for instance Infrared toners, UV toners, intaglio printing, steel die printing, security paper, kinegram. Designers usually remain in the area of graphics that are visible in daylight. Securities experts perform additional mixing of colors that alter under UV light. Knowledge on the printing colors IR system is a new area in the printing business. The area of software designing has been opened, purpose designing and coded graphic product security. Studying the characteristics of many colors in IR radiation has started programming of security graphics in a new way. Collaborators in this assignment have developed algorithms of dual separation in the visible RGB system for graphic prepress of spot and process toners using information on light response in the IR area.
Keywords: Colour control, daylight, dual separation, infrared, security graphics
3.02. Gravure printing of enzymes and phages
Tarik Jabrane(1), Jawad Jeaidi(1,2), Martin Dubé(1), Patrice J. Mangin(1)
(1) Centre Intégré en Pâtes et Papiers (CIPP), Université du Québec à Trois-Rivières
3351 boul. Des Forges, C.P. 500 Trois-Rivières, Québec, Canada G9A 5H7
461 Rue de la papeterie, BP 65, 38402 Saint-Martin d'Hères, France
Detection and disabling of biological pathogens such as bacteria and viruses is of great importance to control diseases apparition and to insure the environmental integrity of air, water or food. Due to their ?exibility, low cost and ease of fabrication, papers and non-wovens are ideal substrates to support bio-chemical sensors.
In this work, we show that a hydrogen peroxide bio-sensor can be made by gravure printing of horseradish peroxidase enzyme on paper. In particular, we discuss the effect of shear rates on the biological functionalities of the enzyme and show that shear is not large enough to impair large scale industrial printing of this particular enzyme. We also show that phages, viruses that can infect and destroy E. Coli bacteria can effectively be printed on paper.
Keywords: Bioactive paper, gravure, printed functionality
3.03. Rotogravure for printed electronics
Alexandra Pekarovicova, Erika Hrehorova, Paul D. Fleming, Marian Rebros, Margaret K. Joyce
Center for Ink and Printability Research
Department of Paper Engineering, Chemical Engineering and Imaging, Western Michigan University
Kalamazoo, MI 49008, USA
A flexo press unit was modified to print in a gravure offset configuration, direct gravure equipped with metering roll, and in a direct gravure with an enclosed doctor blade mode. Rotogravure test forms were prepared by laser ablation and chemical etching. Different features such as lines, gaps and source and drain electrodes were engraved at different angles to the print direction. Graphic ink and conductive nanosilver and silver flake water based inks were used for printing. Results showed that offset gravure did not produce missing areas/missing dots, however, printed lines had much higher gains than those printed by direct gravure. Direct gravure with metering roll causes premature solvent evaporation resulting in missing areas in fine features printed on paper substrates. Direct gravure printing with an enclosed doctor blade produced the most consistent results.
Keywords: Direct gravure, fine features, printed electronics, print fidelity, offset gravure