One part of the design is not correctly positioned with another.
Causes:
- Plates not mounted in register;
- Incorrect web tension;
- Incorrect drive-roller adjustment;
- Excessive web temperature;
- Press register compensator not centered;
- Idle rollers dragging or running intermittently;
- Press out of alignment;
- Variations in substrate gauge;
- Incorrect (damaged) drive gear or journal;
Solutions:
- Remount plate in register. Review plate mounting and make-ready procedures. Check plate thickness, dispro and relief depth. Check tape thickness;
- Adjust tension controls appropriately for the substrate being printed;
- Check drive roll parallel for constant side-to-side pressure and centre wear condition;
- Reduce dryer temperature;
- Centre individual advance/retard running registers and side-to-side register compensators before manually keying in job register;
- Replace or lubricate idle roller bearings;
- Realign press;
- Replace substrate;
- Replace drive gear or journal.
