Gas Ghosting/Chemical Ghosting
The transfer of a printed image from the front of one sheet to the back of another.
|Large solids printed on a back-up form||Print the heavy coverage form first, and light form on the back-up side|
|Large lifts||Run smaller lifts when backing up the sheets|
|The first side is not allowed sufficient time to dry||Allow sufficient time to dry, typically 24 hours|
|The drying of the ink on the second side is accelerated or retarded by fumes given off by the ink solvents on the first side||Wind sheets before printing back-up side
Keep lifts in sequence
Keep lifts away from sources of excessive heat and cold
This includes ink starvation and repeat ghosting type issues. This type of ghosting always occurs on the same side of the sheet.
|Poor layout||Lay the job out too minimize ink saturation of solids|
|Ink starvation||Increase ink feed|
|Ink film too thin||Consult ink manufacturer|
|Ink too transparent||Use opaque inks instead of transparent inks for solid tints|
|Too much water||Lower water settings, adjust chemistry|
|Ink rollers wrong diameter||Measure and replace rollers, increase pitch on vibrator roller|
|Blanket too soft||Consult blanket manufacturer and replace with harder blanket|