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Basics of graphic standardization for the production of plastic cards


Research report

80.008

Author

Bartl, J.; Bertholdt, U.; Müller, A.

Year of publication

2018

Abstract

This report is concerned with colour measurement in the identity card sector and offers proposals for colour simulation.

Drawing on 42 combinations of materials, it has been possible to develop an updated colouring recommendation for solid colours in waterless UV offset printing on white films.

The colour coordinates of all the investigated colour patches altered as a result of lamination. The overwhelming majority of colours become darker and more chromatic. Colour measurements by the measurement device with an 11 mm aperture size are brighter and more chromatic than those made with the measurement device with a 4 mm aperture.

The lateral spread of light in the laminate constantly increases with the layer thickness of the overlay. It was possible to detect some influence of the film material on lateral light spread. It was possible to successfully simulate the lateral spread of light for differing overlay thicknesses. As an example, it was possible to use this to simulate certain yellow and cyan colour coordinates for a colour measurement device with an 11 mm aperture from the values measured by a device with a 4 mm aperture.

Colour measurement data from the two different measurement devices were used in the production of digital proof prints. Visual comparison between proof prints and laminated originals exhibited good agreement for laminates with an overlay thickness of 100 µm for both measurement devices. A detailed examination found that the colour patches of proof prints based on 4 mm colour measurement data were somewhat darker and less chromatic than the laminate, whilst the colour patches of proof prints based on 11 mm colour measurement data were somewhat brighter and more chromatic. For laminates with an overlay thickness of 200 µm or more, the visual similarity between proof print and laminate is clearly better for proof prints based on 11 mm colour measurement data than for those based on 4 mm colour measurement data.

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