Troubleshooting Guide - Pressroom Conventional
On Press Issue: Chemical/Gas Ghosting
Potential Causes
Large solids are printed on back-up form
Solution: Print the heavy form first, and the light form on the back-up side.
Problem may be caused by large lifts
Solution: Run small loads when backing up the sheets to improve exposure to air.
The first side is backed up too soon after it is run
Solution: Hold the lifts three days before printing back-up sides.
Tips to prevent or minimize ghosting
Solution:
- Wind sheets before printing back-up side
- Keep lifts in sequence for back-up.
- Keep lifts away from sources of excessive heat and cold.
- On small expensive runs, slip-sheet the stock while printing the second side.
Tips to save job that has ghosted
Solution:
- Size with dull varnish then apply gloss varnish.
- Run sheets through the press without printing to supply fresh air before back-up is printed. Heat helps.
- Wind sheets frequently and wait.
