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Re: [BKARTS] why fold on the grain?



The immediate problem about folding across the grain of the paper is
that the fold line will be rougher and, after many foldings and
unfoldings, weaker that for a fold parallel to the grain.
These problems are worse for coated papers. Take some glossy printed
page from your junk mail and try folding it both ways and looking
closely at the folded edge. Folded one way (with the grain) the fold
line will be fairly smooth; folded across the grain the fold line will
be rough due to the glossy paper surface tearing unevenly near the fold.
The roughness of a cross-grain fold can be reduced by scoring the paper
before folding, but it will still be a weaker fold than one parallel to
the grain.

As well, in many bookbinding situations, if you are folding the paper
across the grain, this usually means that the grain orientation in the
finished book will be wrong: book pages with cross grain won't lay flat
as well by themselves when the book is opened, and it is more likely
that you might have materials pasted together cross-grain ultimately
causing warping every time the humidity changes.

-Kevin Martin
 the Papertrail 

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