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B-7
Appendix B
Paper Selection
Moisture Content
Moisture content is defined as the percent ratio of moisture to the dry mass of the paper. Moisture
can affect feedability, electrostatic properties, and toner fusing characteristics.
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
environment. Some tips on moisture control are:
● Store paper in a dry, well-ventilated location.
● Keep the paper flat and 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.
● Avoid leaving paper where it is exposed to heat, sunlight, or damp.