Corona over-treatment
Medium severitySymptoms
Surface blocking in the pile, odor, coating migration, or adhesion getting worse instead of better
Probable causes
- Excessive corona power for the speed
- accumulated multiple passes
- PE surface degradation (over-oxidation)
The Print Guy · 2026-10-05
Other problems in this category
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-129
Local treatment loss from handling
Zones where ink won't stick shaped like fingers, hands or rub bands; the rest prints fine
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