Abstract:
Hybrid inks represent a type of inks that are cured by two various mechanisms,
oxypolymerization and polymerization induced by UV radiation. The printability
of offset inks strongly depends on the rheological properties of printing inks, their
tack and fountain solution pick-up behaviour. In this work, two process hybrid
inks and two UV curable inks were tested. The studied process inks were in both
cases cyan and magenta. The tested physical properties were evaluated for
unemulsified inks and their emulsions with fountain solution. The emulsions of
inks and fountain solution were characterised by the amount and rate of fountain
solution pick-up. The rheological properties (flow behaviour, thixotrophy, and
viscosity relaxation) were measured with rotational rheometer RV1 HAAKE, the
tack and misting with Tackmaster-92.
