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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.
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.