Analysis of roughness measurements of coated cardboards, 21TAPPICon Virtual

In recent years, the interest in printing coated cardboards with water based Inkjet inks has grown. Consequently, the demand for investigations about the interaction between low viscosity inks and the pigmented surfaces also increases. To understand these interactions is necessary to analyze several material parameters as surface energy, ink viscosity, density, porosity and also roughness. The main method to measure surface roughness, Parker Print Surf (PPS), was developed to operate under conditions close of letterpress, lithography and gravure. However offset and Inkjet inks are physically and chemically different. In this paper the correlation between PPS and other optical roughness parameters measured by means of confocal microscopy are analyzed. Moreover roughness measurements are correlated with optical density and minimal remission values. It was demotrasted that the correlation of optical roughness parameters with PPS is weak. PPS measurements show a very strong correlation with density by dye based inks but not by pigment based inks. Among other findings, it was shown that some height and functional optical roughness parameters can provide a proper correlation with the flow behavior from both dye and pigment based Inkjet inks.  

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