Set-Off - What is set off?
In printing, set-off is a defect in the print characterised by the transfer of wet ink from the substrate to another surface. Set-off is commonly seen in the printing of sheets, where printed sheets are usually stacked on top of one another; if the ink on a sheet doesn't dry properly before the next sheet exits the printer, the ink will transfer to the back of the next sheet. Set-off can occur if an ink doesn't dry quickly enough, if the substrate isn't absorbant enough (leaving a thick film of wet ink on the top of the substrate), or if the paper is cold (which slows the drying process).
Set-off is also the basic principle behind offset printing methods; in offset printing, ink is transferred from an image carrier or imaging device to the substrate and this process relies on the ink not drying in place on the transfer medium.Go Back to Glossary