This should be kept as low as possible, but not so low as to cause creasing.
Speed of application
Good transfer results can be achieved at speeds between 8000 and 12000 sheets/h. The results at higher speeds are very dependent on the substrate and design.
Standard rubber blankets can be used to apply the adhesive.
Mainly Superpress (glass bead blanket) or Irioblanket (white teflon coating) are used to apply the foil.
Quick release rubber blankets should be used for subsequent printing to prevent stripping of foil particles and adhesive.
The adhesive coat should be adjusted according to the substrate. As a rule, the coating weight will be approx. 2 - 3 g/m². In the case of adhesives for silver foil, an optical density of 0.3 - 0.35 (measured with the filter that gives the highest value) would be suitable; in the case of adhesives for gold foils, a suitable value would be 0.55 - 0.65 (measured with the blue filter).
Packing for the rubber blankets
The packing in a foil printing unit can be between 0.0 - 0.2 mm above the bearing rings. This variable can affect the circumference of the rubber blanket cylinder and therefore also the speed of the foil to the substrate.
The following parameters can improve at a somewhat higher pressure: gloss, edge definition, raster print.
Compared to the printing impression adjustment required in printing units for normal printing, the printing impression adjustment for foil printing units should be somewhat thicker in order to achieve optimal foil transfer (surface coverage, gloss, edge definition).