Oil-based Varnish
The composition of oil-based varnishes is essentially the same as
that of offset inks (75 % solid substance content as well as drying
through penetration and oxidation). Since these varnishes are
intended to create a highly transparent film with little coloring,
all materials used have to be of premium quality. The varnishes can
be processed full-surface without dampening (place a format sheet
under the blanket) in the case of spot coating, on the other hand,
a conventional offset printing plate with dampening is needed.
Advantages
Advantages
- Simple processing as with offset inks
- Good absorption of varnish
- Open areas easy to achieve with offset plates
- Good moisture protection
- No solvent emissions
- Flexible varnish film layer (no problem with creases and folds)
- Low layer thickness
- Danger of yellowing
- Slow drying
- High amounts of spray powder needed
- Possible influence on smell and taste with food packages
