Their principal advantage is their low cost.
Two types of flexo formulation are available : water based acrylic resin solutions or dispersions (water based flexo varnishes) and solvent based cellulosic resins (solvent based flexo varnishes).
Gravure varnishes are solvent based cellulosic formulations.
These varnishes are applied using conventional flexo and gravure printing units.
They are used for in line wet-on-wet varnishing of flexo and gravure inks respectively.
Drying by coalescence (water based varnishes) or by evaporation (solvent based varnishes) is rapid or even instantaneous (hot air dryers are used).
> See “Flexo and Gravure Inks” .