Local treatment loss from handling
Medium severitySymptoms
Zones where ink won't stick shaped like fingers, hands or rub bands; the rest prints fine
Probable causes
- Fingerprints, grease and silicones locally destroy the treated PE surface tension
- belt or guide rub
- friction in piling
The Print Guy · 2026-10-05
Other problems in this category
Polyboard/Corona · TPG-121
Corona over-treatment
Surface blocking in the pile, odor, coating migration, or adhesion getting worse instead of better
Polyboard/Corona · TPG-125
Severe static with polyboard
Sheets sticking at the feeder, constant doubles, shocks to staff, dust attracted to the surface
Polyboard/Corona · TPG-126
Wrong side treated or printed (1-side / 2-side polyboard)
Perfect adhesion in tests but failure in production; PE and fiber sides confused
Polyboard/Corona · TPG-119
Ink won't adhere on polyboard (PE)
Ink scratches off with a nail or lifts with tape; image 'floating' on the surface
Polyboard/Corona · TPG-120
Corona treatment decays over time
Stock that printed fine weeks ago now rejects ink; dynes lower than the supplier declared
Polyboard/Corona · TPG-122
Uneven corona treatment (bands or untreated zones)
Good adhesion in parts of the sheet, poor in others; visible bands with test ink