Lightfastness of Litographic Primary Colours Coated With Nanocomposites Composed of TiO2 and Water-Based Varnish

The UV radiation causes inks to fade. The ink fading will lead to the degradation of the visual appearance of printed imprints making them less attractive to the user. To deal with this that phenomenon, one of the solutions is to create a coating that could challenge these issues. In order to create efficient protective coating against UV induced degradation, nano scaled titanium dioxide (TiO2) was added to the commercial water-based varnish. To determine influence of the amount of TiO2, was homogenized in various weight ratios. The prepared nanocomposites were applied onto offset (lithography) prints made in accordance with Fogra PSO, i.e. ISO 12647-2:2013 on gloss coated paperboard. The samples have been subjected to artificial UV induced aging for 30 hours. The protective properties of the nanocomposite TiO2 coating was determined by calculating colorimetric and densitometric change on full tone and determining tone value change of half tones.

Coating, Nanoparticles, Titanium dioxide (TiO2), Lightfastness, Packaging