Water-based coating problems: causes and fixes
8 Water-based coating problems in offset printing and finishing: symptoms, probable causes, step-by-step fixes and prevention.
Water-based coating · TPG-144
Blocking in the pile
Coated sheets sticking together in the pile or at the guillotine
Water-based coating · TPG-146
Coating crawling over the ink (craters)
Fish eyes or zones the coating won't wet
Water-based coating · TPG-142
Orange peel
Rough orange-skin surface in the coating
Water-based coating · TPG-143
Low coating gloss
The gloss finish comes out matte or uneven
Water-based coating · TPG-145
Foam in the coating circuit
Bubbles leaving craters or uncoated voids
Water-based coating · TPG-147
Coating yellowing
Paper white turning yellowish after coating
Water-based coating · TPG-148
Streaks in the coating
Machine-direction lines in the coating film
Water-based coating · TPG-149
Coating cracking at folds
Coating cracks white at folding or creasing
Other categories
Binding (hotmelt/PUR) (8)Blankets (7)Die-cutting/Cracking (12)Feeder/Delivery (9)Folder-gluer (18)Folding (12)Fountain solution (10)Gathering/Stitching/Gluing (10)Grippers/Sheet travel (8)Guillotine/Cutting (6)High rulings/Stochastic (12)Hot foil (7)Ink (material) (12)Inking calibration (6)Lamination (5)Metallized (9)Offset – Ink/Water (14)Offset – Mechanical/Paper (12)Paper/Board (10)Plates (CTP) (7)Polyboard/Corona (14)Prepress (10)Pressroom climate (5)Rollers (7)Stripping (8)Substrates GC/Bond/Coated (11)Three-knife trimmer (8)UV coating (7)Wire/Spiral binding (7)