pressing tins
1. Sheets of tin or zinc used to separate
gatherings that are to be compressed before
sewing. 2. The thin sheets of metal used between
the free endpapers and the board paper during
final pressing to insure even pressure of the
entire surface of the text block, to prevent any
dampness from the adhesive used in pasting down
the board papers from reaching the flyleaves, and
to prevent indentation of the turn-ins into the
text block. (237 ,
335 )
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