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White dots on the printed materials
Hello everybody. Please give any ideas about our problem. We have
VP540, with Bordeux inks.
From time to time some white dots appear on the printed materials, and
in one moment they disappear. We can’t understand why it is happening.
First when this appeared we considered that the material is old or
not good for printing.
And we tested 10-12 other materials (Orafol 641, OrientFlex, Grafityp)
vinyls, banner, translucent…. We had the same result on all of them.
We managed to close the circle around the problem when we printed a
table of the CMYK from zero to one hundred % with step of 10%. The dots
appeared only in the square with 90-100% fillment. We tried everything
we could think about. We raised the humidity in the room, lower the humidity, cleaned the room, cleaned the room, made a maintenance cleaning, several normal cleanings, several test prints (it’s OK), put a ground cable (don’t know how effective it is), we changed the temperature of the room and the print, we cleaned the refills,
dried them, and poured fresh inks….we tried a lot of things.
Please if you have any ideas I’ll be grateful to hear them.
Thank you in advancep.s. Here are some pictures.
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