zig-zag guard
A continuous one-piece guard prepared by folding a
sheet of heavy paper, linen, or Japanese copying
paper concertina-wise. It is used in the
construction of photograph albums and similar
guard books, as well as for sewing the folios of
large blankbooks and for resewing the sections of
books in conservation binding. For conservation
sewing, the thin Japanese copying paper is used,
its purpose being to prevent the adhesive used in
gluing up from reaching the sections and the
inside of the book. (367 )
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