●
V
acuum. In some thin substrates, if the vacuum is too high, the substrate follows the shape of the
platen ribs, modifying the printhead-to-substrate spacing and causing vertical line roughness. In this
case, as the substrate advances, vertical lines get wider after each pass, while horizontal lines are not
aected.
To correct this problem, try adjusting tension and vacuum settings according to the table below, step by
s
tep (a to c), until you nd settings that work.
Graininess
The print shows a higher level of grain than expected, either throughout the print or in some specic areas.
The example below shows more grain in the lower half than in the upper half.
This can occur for various dierent reasons.
●
Coalescence. Some substrates, in some particular conditions, can produce a type of grain due to wetting
issues. For example, in high humidity or low temperature environments, the ink may not dry fast enough
in fast print modes, producing a grainy eect on the print. The example below shows worse coalescence
on the right-hand side.
ENWW Advanced print-quality troubleshooting 329
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