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Rub Proofness Tester
The rub proofness tester
is used for determination of fastness of colour of light leathers to
wet and dry rubbing and for measuring the transfer of colour to the
material with which it is rubbed. The test specimen is rubbed with a
rotating circular felt pad pressing against it under a specified force,
and the number of revolutions of the pad required to produce certain
specified effects is determined.
This equipment can also
be used for assessing the degree of damage to a material during mild
wet abrasion imitating the scuffing action of a damp hose on footwear
insole during wear. A rotating wet circular felt pad, covered with a
worsted fabric under a specified contact force rubs against the test
specimen. Overall damage to the test specimen is assessed by measuring
its mass loss after a specified numbers of rubs.
The GLOBE Rub Proofness
Tester is constructed on a rigid fabricated frame. Rubbing is carried
out by rotating a felt pad against a test specimen placed on an anvil.
The felt pad is held in a rotating holder with the help of three sharp
needles and can be raised and lowered with the help of a lever to bring
it in contact with the test specimen.
Motion to the felt pad is
given by an AC synchronous motor and belt-pulley arrangement. The
sleeve in which the rod carrying the rotating holder slides is mounted
on two ball bearings to give it a long and trouble-free running life.
Weights are provided to apply the specified forces on felt pads for
both dry and wet rubbing.
The test specimens are
normally kept on a flat platform under the rotating felt pad. However,
for testing of finished products, provision has been made to replace
the flat platform by a small circular anvil that can accommodate
various finished products like shoulders of garments and shoes.
A four-digit electronic
counter with re-set counts the number of abrading rubs of the felt pad.
The counter operates only when the felt pad is lowered on to the test
specimen.
The tester is finished in
shore blue matalic painting and bright chromium or zinc plating to give
it a corrosion resistant finish.
Technical Specifications
Rotating Speed
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150 rpm
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Load on felt pad
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0.73 kg or 2.5 kg
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Motor
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AC synchronous motor - 20 kg cm
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Counter
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Four digit electronic counter
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Related Standards
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IS 6191 - 1971
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Methods of Micro-Biological Colour Fastness and Microsocopical Tests
for Leather
LF 9: Determination of Fastness to Rubbing (Wet and Dry) of Light
Leathers
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BS 3662 - 1962
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Methods for the Determination of Colorfastness of Leathers
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SLTC - SLF/5
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Determination o Fastness to Rubbing (Wet and Dry) of Light Leathers
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Satra PM 14
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Resistance to Scuffing by Mild Circular Abrasion
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