Dirty Print – Halos

Pressure between plate and substrate is excessive

Reset plate pressure to “kiss” impression

Plate or sticky-back tape is too hard

Use plate with softer durometer; switch to a cushion sticky-back tape

Edges are cupped on plate

Check plate and replace if necessary

Plate cylinder is out of round causing intermittent halos

Check run-out of plate cylinder and anilox roll; replace plate and/or anilox roll