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Dynamic Water Proofness Tester.
Dynamic Water Profaneness Tester -
The uppers of shoes get folded over the toe portion every time a step
is taken. These repeated foldings cause the finished grains to start
cracking, resulting in loss of water resistance. To ensure that the
leather uppers retain their water resistance for a reasonable period of
use, the action of such foldings on them is evaluated by subjecting test
specimens taken from the leather to a water penetration test using a
penetrometer.
In this apparatus the test
specimens are held in form of a trough between two cylindrical grips.
One of the grips is then repeatedly moved towards and away from the
other along their common axis. The test specimens are kept immersed in a
water bath up to a part of their periphery. Penetration is detected
when an electric conductivity is established between the inside and
outside surfaces of the test specimens.
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