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A • Introduction to Paper
Paper Characteristics
There are several paper characteristics that can prevent your
application from being an accurate and productive process.
The paper characteristics listed below have a direct affect on
the folding/inserting process.
•
Moisture
•
Wire and felt sides (of the paper)
•
Surface coating or finish
•
Body or strength of material
Moisture
As paper is rolled, it has a moisture content of about 92-94%
pulp and 6-8% water. Moisture content can change due to
local atmospheric conditions. On rainy days, paper will tend
to absorb more moisture, while on dry days it will tend to lose
moisture. This process causes the paper to swell or shrink
depending on the condition. Consequently, two identical
reams of paper stored under different conditions of humidity
can be two different sizes when the time comes for folding
and inserting.
Laser-printed material can also affect reliability because laser
printing tends to dry paper out excessively. Dry paper is more
prone to curl and accumulates static charges more readily.
Laser printing also hardens the paper due to pressure. Both
the dryness and hardening of paper will change its folding and
feeding characteristics.
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