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Presentations 2015, 2016

iarigai Toronto 2016
iarigai, VIGC, IS&T at drupa 2016

iarigai VIGC, Brussels
Evolutions in food packaging printing

You are here: Conferences & Events * 2009 Stockholm * Abstracts * 4. Digital and special printing

4. Digital and special printing

4.10 The print of the double picture and INFRAREDESIGN in the space of the security graphics

Ivana Žiljak, Klaudio Pap, Jana Žiljak Vujić

The development of printing graphics with two images of which one is observed under IR light and the other in daylight is becoming a reality in graphic product protection (Žiljak V., Pap K., Žiljak I., 2008). If we look back into history, up till now there have been two methods for producing double images: on basis of the lenticular method or with the help of holography. Both of the methods require a carrier with specific characteristics in respect to micro lens use or a highly embossed master on special material. In comparison with the mentioned methods infrared graphics are not limited with dimension characteristics. Infrared design is a method independent of material, and all kinds of paper may be used, even silk and textile. In the same way that holograms require specific conditions such as (monochromatic) light sources, infrared design recognizes two images in two different wavelength areas. For instance, any video camera today has the possibility of using the IR area along with the daylight area owing to CCD technology development. This is why the INFRAREDESIGN method can be checked easily, introduced into production and set as the simplest printing method in the graphic securities area.

Keywords: Security, Infrared, Steganography, Printing
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4.11. High volume security printing using sheet-fed offset press

Slavtcho Bonev

Security printing based on DataGrid and EpiCode is a novel, very effi cient anti-counterfeiting technique based on the individuality of prints. DataGrid is a high-density halftone data storage which forms a unique signature – the so called EpiCode - when it is printed. The EpiCode is caused by the physical interaction between printing medium (ink) and substrate (paper) and is used as a fi ngerprint for authentication. In sheet-fed offset printing the signature of the printing plate is a novel feature for anti-counterfeit applications. In the presented printing tests, the infl uence of the substrate on the EpiCode and the long-term stability of the offset printing process regarding the plate signature are determined using biometrical analysis. Equal error rates (EER) better than 10-40 are achieved in the case of four paper grades commonly used for labels and packaging. Further, the printing plate signature has proven a stabile feature for a cluster of printed DataGrids and is therefore called ClusterCode. Authentication based on ClusterCode achieved equal error rates (EER) better than 10-10. In addition, a recognition system using a reduced database is proposed.

Keywords: Security printing, Paper substrate, Long-term stability, Print quality control, Biometrical system
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