Rubbing Fastness Tester

CROCKMETER

ð  In addition to colour transference tests, the Crockmeter performs scuffing, wet / dry abrasion, flexing, powdering, dry-cleaning, ink abrasiveness, and other tests.

ð  Test conditions are controlled and reproducible through the use of standard pressure and motion.

Features of Crockmeter:

ð To determine the Colour Fastness of Textiles.

ð The equipment consists of a counter.

ð It is provided with a flat peg.

ð It also consists of an operating handle.

ð Tests the colour fastness of the textile in a very accurate manner.

ð It gives not only accurate but quick results also.

Specifications of Crockmeter:

Diameter of the Rubbing Finger	: 16 mm & 25 mm
Force on the Finger	: 9 N & 20 N
Size of Crocking Cloth	: (5 x 5) Cms& (7 x7) cms
Length of the Traverse	: 100 ±5 mm
Size of Test Specimen	: 25 x 5 Cm
Working

Ø  Dry Rubbing:

ð  Properly mount your specimen and test cloths.

ð  The counter has to be reset by moving the knob on the left side of the counter.

ð  The finger is positioned on the specimen at the base’s front end and handle is rotated in the clockwise direction at the rate of approximately 1 revolution per second.

ð  The handle is then rotated equal to the number of strokes specified by the test method.

ð  When the desired number of strokes is reached, the crocking cloth is removed from the finger and its degree of staining has to be evaluated by SDC grey scale.

Ø  Wet Rubbing:

ð  A fresh piece of crocking cloth is soaked in distilled water and the excess water is removed so that it contains its own mass of water.

ð  The wet piece of the crocking cloth is fixed over the end of the finger of the Crockmeterand the test is undertaken.

ð  The dyed or printed fabric has to be mounted on a lower platform.

ð  Then 10 cycles are rubbed with a white fabric, which is mounted on a peg in the upper rubbing arm. 

ð  Then the extent of colour that rubs away onto the white fabric against a colour transference scale has to be determined. 

ð  The rubbing action of the peg+ enabled fibers from the upper coloured flannel fabric surface to be transferred onto the white backing fabric mounted on the lower platform.  The cloth is then removed to evaluate the discolour level in comparison with a gray-scale.