Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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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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