GM · CONVERTING UNIT
31
10.
Registration accuracy
The registration accuracy is defined as the deviation in the first cutting line relative to the registration mark.
If there is deviations due to differences in gab size between the labels, it has to do with the distortion setting
or the dispro factor of the plate. To get the best possible results do the following:
1.
Select the shortest possible plate. The ideal situation is one label row pr. rotation, if this is not
possible go for 2,3,4. The machine gains accuracy as the distance between registration marks
shortens. For optimal economy it is acceptable to use the longest possible repeat on the print
engine, but remember to put several registration marks in the repeat, a shorter plate can be used.
Remember to put only one registration mark per plate length.
2.
Measure and check that the printed repeat length exactly matches the plate repeat.
3.
Measure and check that the plate edge to first cutting distance is entered correctly
4.
Run with all nips down.
5.
Secure that the die is correctly shimmed up (no lateral movement) and the inductive sensor behind
the die is correctly adjusted (2mm from die tooth wheel)
6.
Secure that the mark reader focus distance is 9 mm
7.
The repeat distance must never be less than the distance between the mark reader and the die (this
is only the case if the mark reader has been moved) om the first cut line. If this happens, machine
will die cut a labels based on the registration mark for the next label. This will reduce precision.
8.
The space between register marks must never be less than 50mm
9.
Do not die cut across print engine frames (Always align the register mark with the frame start)
