Topic of your interest

Communication of characteristic values describing the metallic appearance of prints

Short name: Characterization of metallic prints

Fogra no. 34.021
Project leader: J. Gemeinhardt
Funding: BMWi (IGF) via AiF

Timescale: 01.11.2018 - 31.10.2020

Objective and relevance

Metallic effects are often used in packaging. Communication of these effects is problematic in the workflow from product planning to the actual printing process. So far, there are no production-oriented parameters that allow a clear description of the visual appearance. In addition, both the colour measuring devices commonly used in the printing industry and the viewing booths are unsuitable for characterizing metallic print samples.

Therefore, the research project aims to establish objective parameters that correlate with the visual appearance of printed metal surfaces. Furthermore, a viewing technique is to be developed that allows a clear assessment of the metallic effect.

Jürgen Gemeinhardt

Head of Printing Techniques

+49 89 431 82 - 256

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I would be pleased to answer your questions about the project and look forward to exchanging ideas with you.

Solution steps

Colour measurements with different measuring devices and geometries are to be carried out on an extensive selection of metallised print samples. For this purpose, multi-angle colour measuring devices, a goniospectrophotometer and a spherical measuring device are to be used. Additionally gloss measurements are carried out.

Furthermore, a special viewing device with adjustable illumination and viewing angle is to be constructed. The visual evaluations of the metallic samples achieved with this device are to be compared to the metrological results.

Targeted results

The aim of the research project is to establish objective parameters that correlate with the visual appearance of printed metal surfaces. These should not only be ascertainable by the use of special laboratory equipment, but also support the production process with the help of standard measuring devices. The parameters should be scaled in such a way that they form a sensationally equidistant effects space.

In addition, a viewing technique is to be developed that will allow an exact evaluation of the metallic effect. The focus is on the definition of different combinations of illumination and observation angles. In addition, recommendations will be developed to enable users to perform the best possible visual assessment even without a dedicated viewing booth.