NEW LED-UV DRIP OFF
LED-UV becomes more and more important. This technology combines all advantages of traditional UV printing; however - compared to conventional lamps - without the emission of ozone or the use of mercury vapor lamps.
Although there is limited need for additional protection due to the immediate curing of LED-UV printing inks, overprint varnishes are indispensable. They finish printed products with valuable visual effects and differentiate the brand from competition. Moreover, LED-UV coatings provide a wide range of advantages, as for example a high reactivity, the very good mechanical resistance or by forgoing anti- set-off powders for optimal surfaces.
Currently used UV varnishes, however, adjusted to the spectrum of conventional UV lamps, are not suitable to be used in LED-UV printing. New developments and their photoinitiators must consider the narrow wavelength definition of LED-UV technology.
For the calendar sheet of January we decided for a LED-UV drip off system. Out of the last ink duct, a UV based drip off primer was used partially (light bulb left out). This was followed by a full-area application of the UV gloss varnish out of the coating unit. The result: A "luminous" light bulb on a matt surface.
Anilox roller: 17 cm³/m², tri-helical, 45°, 80 l/cm