Troubleshooting Guide - Pressroom Conventional
On Press Issue: Scumming
Potential Causes
Fountain solution conductivity is out of specification
Solution: Check conductivity to manufacturers specification. As a guideline, if solution is more than 1000 over a fresh properly mixed solution, it should be replaced with fresh solution.
Glazed blanket, ink rollers, or dampening rollers
Solution: Clean thoroughly and recondition per manufacturers instructions.
Excessive printing pressure
Solution: Make on-press adjustments to proper pressures.
Ink body is too soft in body and spreading into non-printed areas
Solution: Reformulate as necessary.
Plate improperly developed
Solution: Clean with plate cleaner or remake plate.
Dampening rollers out of adjustment or worn out
Solution: Adjust rollers or replace as needed.
Overheated ink rolls
Solution: Check for worn bearings, adjust roller pressure if necessary.
