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Testing Colour Fastness to Rubbing with Crock Meter

Colour fastness to rubbing is a fundamental test requested by consumers to analyze the quality of a coloured fabric and has been an area of concern for manufacturers for a long time. The processor must be aware of the currently required standards for fabrics and use them while performing a quality analysis of their product. Testing procedures for evaluating colour fastness using a crock meter is designed to check the amount of colour transferred from the fabric to other surfaces by rubbing. It is applicable to a fabric composed of all fibers in the form of yarn or fabric whether dyed, printed or otherwise coloured.

Colour fastness of fabrics technique
To evaluate the colour fastness of fabrics two types of technique are implemented. Textile samples are rubbed using a dry cloth and a wet cloth separately.

Know more about other testing instruments used for evaluating the colour quality of fabrics, contact us here.

Dry Rubbing
In this technique, the textile sample is clamped on the metallic platform of the Crock meter. It is to be noted that the direction of the specimen must be parallel to the rubbing track and it lays flat on the board. The test is performed in both directions, one along the direction of the length and the other of the width.

Steps to follow:
1. Place a dry rubbing cloth flat on the end of the abrading finger of the machine and tie it by means of the spring grip.
2. The test specimen is held strongly over an abrasive paper, which is pasted on the upper face of the platform using two pins holding it at both ends. Kindly note that the fabric must be stretched uniformly on to the base, to prevent any rucking up of the sample.
3. Place the finger on the sample, ensuring that the spring grip is not in contact with the testing sample.
4. Rub the fabric sample back and forth over a straight track for a required round of cycles at a fixed rate of speed.

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Wet Rubbing
In this technique, the rubbing cloth placed on the abrading finger is wet out using distilled/ deionized water.

Steps to follow:
1. After getting the rubbing cloth wet, squeeze out the extra moisture by placing it between blotting papers.
2. The remaining steps are same as mentioned above in dry rubbing.
3. To evaluate the result dry out the tested rubbing cloth at room temperature.
Hence, in order to have a successful testing of colour fastness of your fabric product it is equally important to use a high quality crock meter. One such testing instrument is offered by Presto Group, which is a leading manufacturer of testing machineries.

To get more information on Presto Testing Instrument or for any kind of technical guidance, kindly provide your contact details and get a call-back from our team experts right away.


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