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Finish Film Adhesion Tester.
Finish Film Adhesion Tester -
The strength of adhesion between finish film and the leather surface
it is applied on may be found either by pressing a pressure sensitive
adhesive tape over it and peeling it off, or by separating the finish
film from leather and finding the force needed to separate it further.
The first method is empirical in nature and cannot be reproduced
accurately as the adhesion strength of various adhesive tapes and their
bonding with the finish surface cannot be standardized. Hence the second
method Is generally used for this determination.
In SATRA
method for determination of finish film adhesion, a smooth metallic or
rigid PVC specimen-mounting strip is pasted onto the finish film along
the length of the test specimen with the help of a suitable adhesive.
After the bond is set, the sides of the test specimen are trimmed flush
with the edges of the mounting strip and the mounting strip held in a
horizontal plane. The end of the test specimen is separating from the
finish film and a pan containing dead weights suspended from it. The
force needed to cause the finish film layer to separate further is
determined by adding dead weights to the pan till the separation of the
film from the leather takes place.
The Finish Film Adhesion Tester (SATRA type)
for leather consists of an arrangement to hold the test specimen with
the mounting strip on a suitable frame, a hanger with disc shaped dead
weights to apply the separating force on the film and leather bond, and a
hinged platform on which the pan can rest with an arrangement to lower
it.
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