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Introduction to Paper • A
Wire and Felt Sides
Having felt and wire sides, combined with its ability to hold
moisture, can make paper very susceptible to curl. The wire
side has more fibers exposed than the felt side. This causes
the wire side to absorb and lose moisture at a faster rate than
the felt side. As it loses moisture, it shrinks faster and curls
toward the wire side.
As an example, on a normal day, the paper may lay flat on a
table. The next day may be very dry and the paper would take
an upward curl. The day after, wet weather would cause the
paper to take a downward curl. All of these characteristics
could have an adverse affect in feeding paper.
Surface Coating or Finish
The amount of sizing and finish applied to paper must be
given consideration. Glossy finish paper is usually more
difficult to separate by the rubber covered rollers than flat
finish paper. If you will be using glossy paper in your applica-
tion, give samples to your Pitney Bowes specialist for testing
just to be sure it is suitable for the machine (in most cases it
will not be a problem if a release agent was used in the manu-
facturing process).
Body or Strength of Material
The body of the paper can also affect the folding operation.
Paper that is loose, openly-fibered, and contains no sizing
(such as news print, chemically treated, or onion skinned
paper), could burst when gripped by the rollers within the
folding module. Close-fibered and treated paper, such as
writing paper, has more strength, thereby making the bursting
point much higher. Lack of body may cause misfolds and
stalls in the folder.
Other Characteristics
Refer to Chapter 3 for information on recycled paper, paper
weights, and paper graIn.
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Mail Materials Reference Guide
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