Halo Effect (Flexo)

In flexographic printing, the halo effect is a defect where the edges of printed images or text appear fuzzy or outlined.

Causes (C) and Solutions (S) of Halo Effect

Printing Plate Problems

C: Excessive pressure between the plate and substrate

S: Adjust the pressure to just-touching (or kissprint)

C: The printing plate is too thick or has worn off (becoming too hard)

S: Change the plate

Ink Properties

C: high viscosity ink

S: Reduce viscosity with water or a proper solvent

Other Factors

C: Sticky-back is too hard

S: Change to a soft cushion sticky-back

C: Poorly finished or damaged impression cylinder

S: Remove small burrs by professional polishing if possible

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