Double feed or suction failure at the folder feeder
High severitySymptoms
Two sheets together or missed sheets; constant stops
Probable causes
- Too little or too much suction
- badly set separator blowers
- worn feed wheel
- curled or static-charged paper
The Print Guy · 2026-10-05
Other problems in this category
Folding · TPG-221
Folding roller calibration by grammage (procedure)
Loose or marked folds; measurements changing with each paper
Folding · TPG-223
Variable fold measurement during the run
Same fold at different sizes; crosses drifting through the job
Folding · TPG-226
Wrinkles or tearing at the knife fold
Wrinkles at the second/third fold or sheets torn at the knife station
Folding · TPG-217
Wrinkles in cross folds
Puckering at the second fold (air pocket)
Folding · TPG-218
Fold out of square
Pages don't line up; visible stagger at the signature front
Folding · TPG-219
Ink flaking at the fold
Ink or coating cracks right on the fold