High Speed Inline Coating. for Sheet Fed Printing Presses. High Speed Inline Coating for Sheet Fed Printing Presses. Preconditions. - up to 12,000 prints/h the usual processing instructions are to be observed.
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for Sheet Fed Printing Presses
- up to 12,000 prints/h the usual processing instructions are to be observed
- for High Speed Inline Coating with a printing speed of up to 18,000 sheets/h the processing range must be adapted regarding
- substrate- ink layer thickness- coating viscosity- coating selection- performance of the dryer- distance under the dryer
- the combination of substrate and ink should be selected in a way to assure a good bond between ink and substrate
- poor ink drying cannot be improved by coating
- the result is bad rub resistance and insufficient scotch tape resistance
- Overinking of the ink layer thickness with parallel inline coating will reduce the performance of the printing press
- as by reducing the printing speed the drying time is adjusted
- the cell volume of a screen roller is indicated with the scoop amount of water in ml/m²
- the coating application amount corresponds to about 1/3 of the indicated cell volume of the screen roller
A cell volume of the screen roller
of 15 g/m² corresponds to approx 5 g/m² coating application
Wet-on- Wet Printing
Gloss in %
Drying Time in h
Viscosity in s
Cooling Units for Coatings by EASYLAC keep the coating stable in viscosity
- a too high coating viscosity, e.g. above 65 sec. can be adjusted by dilution with water to the required viscosity
- a too high coating viscosity in connection with High Speed Inline Coating will lead to splashing
Viscosity in sec.DIN 4 mm Cup at 20 °C
approximate Water Amount in %
their drying behaviour will be considerably different
Rule of thumb:
For dispersion coatings:
The higher the gloss, the slower the thorough drying
Gloss in %
Application Amount g/m² wet
- UV coatings dry immediately by photo-polymerisation using short wave light
- the acetone test shows whether the coatings have dried thoroughly
- the drying behaviour of the coatings is determined by the performance of the dryer
- the thorough drying of dispersion coatings is primarily determined by the available amount of air
The more air, the better for the thorough drying
- beginning at a pile temperature of approx. 35 °C problems may occur in the pile
An extended delivery between coating tower and delivery is advantageous for the printing speed.
A short delivery is a disadvantage for High Speed Inline Coating.
- for special coating applications, as e.g. application of blister coating, a coating amount of 6 – 8 g/m² has to be applied in order to assure good bonding with the plastic foil
High Speed Inline Coating with 18.000 prints/h will not present any problems if the appropriate coatings are used and the printing press is well adjusted.