Relationship Between Ink Film Topography And Print Gloss In Offset Prints On Coated Surfaces, 2007 Coating & Graphic Arts Conference

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Model coatings with different micro roughness but similar and low macro roughness were prepared and laboratory printed. The coating micro roughness strongly affected the print gloss at low inking levels, corresponding to one or two full tone layers. The effect of coating micro roughness decreased with ink amount and was insignificant at inking levels of 34g/m², which corresponds roughly to 34 full tone layers.

A strong correlation between ink film micro roughness and print gloss was established.

Remaining ink filament patterns that had survived the ink levelling process were observed with a fast setting coating but not with a slow setting coating. The amplitude of the filaments was a few tenth of a µm only and was strongly dependent on ink amount. The filaments were observed in wave length bands between 15 and 125^m, which can be regarded as a submacro roughness region. Their impact on print gloss was estimated on some 6 gloss units.