page pull test
A binding endurance test designed to determine the
force required to pull a leaf from a bound book;
its purpose is to determine the strength of the
method used to secure the leaves or sections of
the book. The leaf is pulled with uniform force
along its entire length, Usually by means of an
Instron tester. The book is clamped into position
by the bottom jaw of the testing device with a
single leaf held in a vertical position by the top
jaw. The jaws are separated and the force required
to tear the leaf or pull it from the adhesive or
adhesive-thread layer is measured. The total force
in pounds is divided by the length of the leaf in
inches to give the page-pull unit of measurement
as pounds per linear inch. The page-pull test does
not measure individually the binding strength of a
book, e.g., an adhesive binding, having a stiff,
high-bulking paper, may display a satisfactory
page-pull test of 5 to 7 pounds, yet if the volume
is subjected first to the SUBWAY TEST , and
then the page-pull test, it may show a much lower
value, even as low as 1 to 2 pounds.
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