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Paper and moisture
Problems caused by moisture
Controlling moisture in paper
X er o x N u v er a P a p er G u id e
Paper fibers expand or contract with changes in humidity.
Changes in moisture content can cause paper to deform, change
dimensions, or change in stiffness.
Excess moisture in paper can cause:
•
Jams, deletions, and/or wrinkles due to sheets with wavy
edges
•
Jams due to paper curl
•
Misfeeds or multi-sheet feeds, especially with coated stocks
•
Mottle (spotty or uneven images)
•
Jams due to sheets becoming less rigid and bunching up in
the paper path
•
Deletions and/or lighter images because excessively high or
low resistivity makes paper less able to attract dry ink
•
Water marks on sheets due to condensation
•
Image quality problems and machine contamination due to
coating rubbing off of paper
Low moisture in paper can cause:
•
Jams due to static electricity
•
Misfeeds or multi-sheet feeds
•
Deletions and/or wrinkles due to sheets with tight edges
(edges shrink and curl slightly)
•
Poor dry ink transfer (small deletions and uneven density)
•
Folds and jams due to paper being too stiff
A change in paper dimension due to moisture can cause
misregistration, especially with duplex printing.
Follow these guidelines to prevent moisture-related problems:
•
Store paper on pallets, on shelves, or in cabinets. Cartons can
absorb extra moisture if placed on the floor.
•
Store paper in a climate controlled room, if possible. Most air
conditioning systems provide a good mix of temperature and
humidity. Paper will perform best if the storage area is
between 68° and 76°F (20° and 24°C) with 35 to 55% relative
humidity.
Ma n ag i ng y ou r pa pe r s u pp l y
2-3
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