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.
