The problem when printing is set-off in the freshly printed stacks (before being coated with Plastisol). This problem, if allowed to go unchecked, will result in many small specks in the final image on the substrate. To avoid this:
- Do not load up the sheet with too much ink
- Keep the stacks short coming off the litho press
- Do not ship the freshly printed stacks from one location to another for 24 hours after litho printing
- Use some dry set-off powder as the sheet comes off the press (up to 50% of the amount used on the job can be used without encountering problems)
For more information, download "AW Litho Tech Bulletin"