The paper's grain can be
one of the most important aspects in acheiving a
perfect fold. The direction of the grain has much
to do with the overall quality of the fold. Paper
that is folded parallel with the grain of the paper
will fold much more cleanly, resulting in a crisp,
straight fold. Parallel grain produces a much cleaner
fold because the paper fibers (grain) are running
in the same basic direction as the fold. Only a few
of the fibers run in the opposite direction and are
able to provide any resistance to the folding mechanism,
thus resulting in a precise, high quality fold.
When a fold is applied perpendicular to the grain
of the paper, the resulting fold may have a ragged
appearance. Perpendicular grain produces a ragged
fold because all of the fibers are folded at one
time creating resistance to the folding action.
The ragged appearance of the fold is especially
noticeable when folding heavier stocks of paper.
More fiber results in more resistence, and lower
quality folds.
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