Moisture Content - Kyocera KM-2540 Advanced Operation Manual

6-4
Smoothness
The paper surface should be smooth, but it must be uncoated. With
paper that is too smooth and slippery, several sheets may accidentally
be supplied at once, causing jams.
Basis Weight
In countries that use the metric system, basis weight is the weight in
grams of one sheet of paper one square meter in area. In the United
States, basis weight is the weight in pounds of one ream (500 sheets) of
paper cut to the standard size (or trade size) for a specific grade of
paper. Paper that is too heavy or too light may be supplied incorrectly or
cause paper jams, which may cause excessive wear to the machine.
Mixed paper weight (i.e., thickness) may cause several sheets to be
supplied at once accidentally and may also cause blurring or other
copying problems if the toner fails to adhere correctly.
The recommended basis weight is between 60 and 120 g/m² (16 and
31.5 lb/ream) for the cassettes and between 45 and 200 g/m² (12 and 53
lb/ream) for the MP tray.
Thickness
Avoid using paper that is too thick or thin. Signs that paper may be too
thin include frequent problems with paper jams or with several sheets
being supplied at once. Paper jams may also indicate that the paper is
too thick. The proper thickness is between 0.086 and 0.110 mm.

Moisture Content

Paper moisture content is the ratio of moisture to dryness expressed as
a percentage. Moisture affects how the paper is supplied, the
electrostatic chargeability of the paper, and how the toner adheres.
Paper moisture content varies depending on the relative humidity in the
room. High relative humidity causes paper to become damp, making the
edges expand so it appears wavy. Low relative humidity causes paper to
lose moisture, making the edges tighten and weakening copy contrast.
Wavy or tight edges may cause the paper to slip when it is supplied. Try
to keep the moisture content between 4 to 6 %.
To maintain the right level of moisture content, bear in mind the following
considerations.
• Store paper in a cool, well-ventilated place.
• Store paper flat and unopened in the package. Once the package is
opened, reseal it if the paper is not to be used for a while.
• Store paper sealed in the original package and box. Put a pallet
under the carton to keep it raised above the floor. Especially during
rainy seasons keep the paper a sufficient distance away from
wooden or concrete floors.
• Before using paper that has been stored, keep it at the proper
moisture level for at least 48 hours.
• Do not store paper where it is exposed to heat, sunlight, or
dampness.
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