Taber Crockmeter (Crock Meter)
The TABER® Crockmeter (Crock Meter) is based on the design described in internationally recognized test standards to simulate the rubbing action generated by a human finger and forearm. The tester uses a standard pressure and rubbing motion to provide quick and accurate test results. Primarily used to evaluate the amount of color transferred from textile materials to other surfaces by rubbing, the Crockmeter has also been utilized to perform smudge and smear tests on images produced by a printer or copier, along with rub abrasion, scuff and mar tests on flat painted surfaces.
Specimens are positioned on the base of the Taber Crockmeter, and clamped in place with the sample holder. To prevent the specimen from shifting during testing, a sandpaper pad may be placed under the specimen. A hand crank moves a reciprocating arm a distance of approximately 100mm. The rubbing action is provided by a 16mm diameter acrylic “finger” which moves back and forth in a straight line with each complete turn of the crank. The reciprocating load arm is weighted to provide a constant 9N load on the sample at all times and a mechanical counter keeps track of completed cycles.
For most typical textile applications, a standardized crocking cloth is used as the abradant. This is wrapped around the acrylic crock “finger” and held in place with a wire spring clip. After rubbing the crocking cloth against a colored test specimen for the prescribed cycles, the amount of color transferred (staining) to the white crocking cloth is compared to a known scale and assigned a grade. Both wet and dry testing can be performed.
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