Room too humid (RH > 65%)
High severitySymptoms
Wavy edges, slow ink drying, set-off, corrosion
Probable causes
- Humid local climate
- no dehumidification
- process vapors (washes, water)
The Print Guy · 2026-10-05
Other problems in this category
Pressroom climate · TPG-212
Room too dry (RH < 40%)
Static, tight-edged paper, variable registration, airborne dust
Pressroom climate · TPG-214
Abrupt climate changes between zones or shifts
Jobs running fine that 'fall apart' as the day changes; registration coming and going
Pressroom climate · TPG-215
High room temperature (> 26-28 °C)
Runnier ink (gain, misting), IPA evaporating, hot rollers
Pressroom climate · TPG-216
Ambient dust in the room
Recurrent hickeys, specks in coating, unstable overall quality