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Re: About paper grain

Hi Cathy,
Maybe your explanation would explain why some paper that has been torn fo=
long time is difficult to mend. Imagine a sheet that has been folded in
thirds, and is torn almost completely apart at the folds.  I've thought o=
it as the sheet coming to act as almost as three separate pieces of paper=
each drying to their own center.  So there can be significant gaps when
trying to do mending.

I take it you mean that the torn edges don't align? If so, it is probably=

because the strains have been released somewhat with the cycling of
humidily in the environment and the paper dimensions change with
the cycling. We used to make paper for an instrument maker who
made cheap relative humidty gages. The sensing element was
a strip of paper that changed dimension with changing rel. humidity.

If you are working with a free sheet, you might be able to wet it,
align the edges, and redry between blotters lightly weighted. This
might help realign the edges. If in a book, the alignment might
be better at a low (or high) humidity.

With your explanation, as a sheet gets "wet" and "dry" with constant
in the storage environment, maybe it could be viewed as being constrained=

differently by itself (where the sheet is attached to itself, versus wher=
the tears are).  So the tensions in the sheet change.
Tensions and the dimensions. I agree.

Dick Grant

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