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- To prevent problems relating to static electricity,
the most important factor is the relative humidity.
(For example, problems with paper delivery, sheet
alignment, and adhesion of paper dust and other
substances.)
- Always keep the relative humidity in the area
around the printing press at 50% or more. (When
heating during the cold seasons, temperature adjustment
should be carried out at the same time.)
- Ionized air is also effective when combined
with a static removing device, but this will not
function effectively when the relative humidity
is below 40%.
- For double-sided printing, the side that should
be printed first is the side with the lighter
printing area. When the surface of a YUPO®
sheets are covered by ink, the ink can become
charged. (Ensure humidification so that the area
around the printing press has a relative humidity
of 60% or more.)
- When an infrared heater is used to enhance drying,
the humidity is greatly reduced in that area.
For this reason, problems are likely to occur
such as misplacement in paper discharge and irregular
spray powder patterns. Be sure to keep the area
around the printing press at a relative humidity
of 55% or more.
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