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B.2. Selecting the Right Paper
B-4
The moisture content of the paper varies with the relative humidity in the room. When the relative
humidity is high and the paper absorbs moisture, the paper edges expand, becoming wavy in
appearance. When the relative humidity is low and the paper loses moisture, the edges shrink and
tighten, and print contrast may suffer.
Wavy or tight edges can cause misfeeding and alignment anomalies. The moisture content of the
paper should be 4% to 6%.
To ensure the proper moisture content it is important to store the paper in a controlled environ-
ment. Some tips on moisture control are:
Store paper in a cool, dry location.
Keep the paper in its wrapping as long as possible. Rewrap paper that is not in use.
Store paper in its original carton. Place a pallet etc. under the carton to separate it from
the floor.
After removing paper from storage, let it stand in the same room as the printer for 48
hours before use.
Avoid leaving paper where it is exposed to heat, sunlight, or damp.
Paper Grain
When paper is manufactured, it is cut into sheets with the grain running parallel to the length (long
grain) or parallel to the width (short grain). Short grain paper can cause feeding problems in the
printer. All paper used in the printer should be long grain.
Other Paper Properties
Porosity: Refers to the density of the paper structure; that is, to how openly or compactly the fibers
are bonded.
Stiffness: Limp paper can buckle inside the printer, while paper that is too stiff may bind. Either
way the result is a paper jam.
Curl: Most paper has a natural tendency to curl in one direction. The paper should be loaded so
that the natural curl is downward, to counteract the upward curl imparted by the printer. Printed
sheets will then come out flat. Most paper also has a top and bottom surface. Loading instructions
are usually given on the paper package.
Electrostatic properties: During the printing process the paper is electrostatically charged to
attract the toner. The paper must be able to release this charge so that printed sheets do not cling
together in the output tray.
Whiteness: The contrast of the printed page depends on the whiteness of the paper. Whiter paper
provides a sharper, brighter appearance.
Quality control: Uneven sheet size, corners that are not square, ragged edges, welded (uncut)
sheets, and crushed edges and corners can cause the printer to malfunction in various ways. A
quality paper supplier should take considerable care to ensure that these problems do not occur.
133


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