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Folding Tester.
Folding Tester -
The ability of leather used in bookbinding to successfully withstand
without cracking repeated opening and closing of the book is determined
by subjecting the leather to a repeated folding test.
In this test the test
specimen in form of a rectangular strip of leather is bent repeatedly
for one hundred times through 180°, the folding being done at the same
location each time. At the end of this test, grain crack shall not occur
on the outer folded surface of the leather specimen under test.
The Folding Tester
for bookbinding leather consists of a fixed grip for holding one end of
test specimen, an oscillating arm which can move through a angle of
180° about a horizontal axis, and a flat blade held in a horizontal
plane with its front edge coinciding with the pivoting axis of the
oscillating arm.
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