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– Technical specification tables 49
Curl is typically measured by laying the sheet of paper on a flat
surface and measuring the height of the corners. There are two types
of curl:
l In-ream curl is the amount of curl in a sheet of paper before
printing. In-ream curl results from the paper-manufacturing
process or from exposure to the environment. Paper with
excessive in-ream curl might lead to feeding and print-quality
problems.
l Post-image curl is the amount of curl in a sheet of paper after
printing. Post-image curl results from exposure to the fusing
process and the paper path in the printer. Paper with excessive
post-image curl can be difficult to handle or to use in
automatic-feed photocopiers.
Finish (smoothness)
Paper for laser printers should not have a heavy texture or a glossy
smoothness unless the paper is specifically designed to work with
your HP LaserJet printer. Printed output on textured paper might
have broken character edges and show poor toner adhesion. On the
HP Color LaserJet printers, textured paper will cause inconsistent or
blotchy colors and can wrinkle in the fuser. Glossy-smooth paper
tends to highlight defects such as stray toner particles, and might not
hold toner. If a glossy paper is desired for the HP Color LaserJet
printer, try HP’s Soft Gloss paper (see "Purchasing HP print media").
For sharp resolution or detail, use a smooth paper.
Paper finish is typically measured using air-leak methods. We
recommend a range for smoothness using the Sheffield method.
Equivalent values for other methods can be found in "Comparisons of
paper smoothness".
Avoid using paper with embossed or raised surfaces, because spotty
printing and misfeeding can occur. It is possible to print satisfactorily
on paper that has embossed areas in the leading edge, trailing edge,
or areas where print will not appear on the paper; however,
misfeeding or jamming can occur.
Felt side vs. wire side
Some methods of manufacturing paper result in two-sided paper
properties. Along with other process variations, these properties can
make one side of the paper the preferred side on which to print. The
“top” side of the paper sheet, as it is formed, is known as the felt side.
The “bottom” side is known as the wire side. Most manufacturers
indicate the preferred printing side on the package. See "Reading a
ream label".