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40 Paper problems
Reducing post-image curl
When an HP LaserJet printer prints a sheet of paper, the sheet
develops a curvature called post-image curl. Generally, the higher the
moisture content of the paper, the greater the curl.
Both the paper and the printer affect the amount of post-image curl. In
the papermaking process, stresses that can cause curl are
manufactured into the paper, so different papers will have differing
amounts of post-image curl. In the printing process, the paper is
subjected to the heat and pressure of the fusing assembly as well as
to the contours of the paper path.
Cause Action(s)
Paper is too moist, resulting in
waviness or curl.
l Print to the face-up output bin. (This
option is not available with some
printers.)
l Turn the paper stack over or turn it
around in the input tray to reverse the
direction of the paper.
l Change to a different type or brand of
paper.
l You may need to acclimate the paper
to your environment to diminish
differences in heat and moisture. See
"Conditioning print media".
l Follow the storage and handling
specifications in this document. (See
"Guidelines for shipping and storing
print media".)
l On HP Color LaserJet printers,
reduce toner coverage by using
dither patterns rather than solid fill.
l The grain of the paper can affect the
curl of the paper. Therefore, if you are
feeding the paper in landscape mode
(horizontally) and are experiencing
curl, try feeding the paper in portrait
mode (vertically).