Troubleshooting Guide - Pressroom Conventional
On Press Issue: Set-Off/Blocking
Potential Causes
Ink setting too slow
Solution: Change to faster setting ink.
Excessive amount of water being run
Solution: Check pH and conductivity of fountain solution. Run as little ink and water as possible, especially on non-porous substrates.
Insufficient spray powder used or not distributed evenly
Solution: Increase powder application. Visually check for the amount and the evenness of distribution with a blacklight.
Loads too high for stock weight
Solution: Run shorter lifts, tray the lifts, wind sheets.
Static electricity
Solution: Use static eliminators.
Pile temperature too hot
Solution: If temperature is over 100 degrees F, the ink could resoften and block or set off. Reduce heat in delivery dryers. Winding sheets could dissipate heat quicker.
Spray units clogged
Solution: Visually examine spray units and clean/unclog if necessary.
Improper particle size of spray powder being used
Solution: Check on spray powder container for particle size. Check with manufacturer for proper particle size for the weight of substrate being used. The heavier the substrate, the larger of particle size is required.
