Care window as soon as the substrate is unloaded, to avoid having the same problem with other
substrates. See Clean the substrate-advance sensor on page 231.
If the problem persists, try adjusting tension and vacuum settings according to the table below, step by
step (a to c), until you nd settings that work.
●
Subs
trate wrinkles. If you see patches of high grain in some local areas of the print, this could be
caused by wrinkles in the substrate. See
There are wrinkles and ink smears on the substrate
on page 299.
●
Color usage. In general, 4-color printing produces more grain than 6-color printing.
Physical deformation marks
You may occasionally see physical deformation of the substrate. This issue is not a mispositioning of the dots,
but a physical deformation of the substrate that usually occurs after the dots have been printed. There are
various kinds of deformation that may occur:
●
Diverter horizontal marks: Deformations of the substrate in the shape of straight lines (about 6 cm
long) towards the printed side of the substrate. They are separated about 2 cm vertically and 1 cm
horizontally.
●
Diverter vertical marks: These physical marks have the appearance of a braid. They consist of small
wrinkles just below the curing module, forming a vertical line of small deformations.
Both kinds of deformations can be the result of an excessive curing temperature. See There are physical
marks on the substrate on page 303.
Poor curing
When the heat applied to the printed substrate is not enough for the quantity of ink laid down, the print may
appear wet or with some gloss marks. The heat needed to cure is directly dependent to the combination of:
ink density, time under the curing module (printmode), curing temperature, airow, and drying power. These
are the defects you may see:
●
Perforated plate gloss marks: The print suers from an added matte pattern over the areas with more
ink density. You can see small circles scattered over the picture with dierent levels of gloss.
ENWW Advanced print-quality troubleshooting 331
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