spiral binding
A form of MECHANICAL
BINDING used for art reproductions, commercial
catalogs, instruction books, books in single
sheets, etc. The leaves are drilled or punched
near the binding edge to take a spiral-twisted
wire or plastic coil which is drawn through the
holes. A tendency for the coil to be torn through
the holes makes this type of mechanical binding
unsuitable for publications likely to be subject
to much use or careless handling. The binding
margins of such publications are frequently less
than 1/2 inch, and part of that is taken by the
holes, which makes rebinding difficult if the
publication must be sewn, as the holes can cause
breakage of the needles and punches of an
oversewing machine. Furthermore, in many cases,
the type of paper used for these publications does
not lend itself well to adhesive binding. Also
called "coil binding," or "spirex binding." (139 , 234 , 338 )