Flexo printing
Halo Effect / Haloing
Problem case
Causes for halo effect
Root cause is too much pressure from the printing plate onto the substrate and the anilox roll. This results in the flexible image carrier squeezing the printed dot onto the substrate and creating a halo around the dot. This leads to a tonal value increase, which can affect the printed image overall. A wrong ink viscosity can lead to halos as do a wrong cell volume of the anilox roll. Another cause is a worn printing plate.
Solution
Solutions for halo effect
1. Check the pressure setting from the printing plate onto the substrate, adjust if necessary. Try to achieve a so called kiss print.
2. Check the viscosity of the ink in conjunction with the correct pick-up volume of the anilox roll and adjust if necessary.
3. Check printing plate for wear and tear as well as flexibility (plate got too hard) and replace if necessary.
Recommended Solutions to solving Halo Effect / Haloing
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