During the printing operation the highlight dots start to form into a “donut” shape, where the center of the dot no longer is transferring ink.
|Dried Ink Particles.
|Avoid dry ink “skin” when removing from kits or cans, clean press thoroughly and remove all dried ink. Pevent ink from drying up on ends of rollers by lubrication and/or manual washing. Filter ink if being pumped from totes or drums.
|Rubber roller is breaking down and releasing particles.
|Recondition rollers and replace if necessary.
|Excessive glaze buildup is breaking away from rollers.
|Use a good glaze remover to clean rollers, or scrub rollers with pumice powder and solvent to remove glaze.
|Breakdown of dampener rollers or sleeves due to wear.
|Replace suspect roller or sleeve in dampening unit.
|Foreign particles, dirt, and debris falling into press.
|Clean the areas above the press, wash up press, and clean plates.
|Loose paper dust, fibers, and coating on web.
|Vacuum the web of paper, run the web through a dead unit, or consult paper supplier.
|Too tacky of ink picking apart the surface of the paper.
|Reduce tack of ink, consult paper supplier for better paper stock.
|Blanket becoming tacky and picking the surface of the paper, rubber is being reverted.
|Wash blanket with a rubber rejuvenator or replace blanket.