I. Instrument overview
The manual rubbing color fastness tester is used to evaluate the color transfer degree of textiles, leather, coated fabrics and other materials under dry or wet rubbing conditions. The equipment is easy to operate and is suitable for rapid color fastness testing in laboratories or factories. It complies with relevant standards (such as GB/T 3920, ISO 105-X12, AATCC 8, etc.).
II. Test principle
By manually operating the friction device, the standard friction cloth is rubbed back and forth on the surface of the sample with the specified pressure and number of frictions, and the color staining of the friction cloth is observed and compared with the standard grayscale sample card for rating.
III. Operation steps
1. Preparation
Sample preparation:
Cut the sample to be tested with a size of ≥20cm×5cm (adjusted according to the standard), ensuring that the surface is flat, wrinkle-free and stain-free.
Rubbing cloth cutting: Use standard bleached cotton cloth (as specified in GB/T 7568) and cut it into a 5cm×5cm square.
Wet friction test: The friction cloth needs to be soaked with distilled water, and the moisture content is controlled at 100±5% (the moisture can be controlled by wringing).
2. Install the friction cloth
Wrap the friction cloth flatly on the friction head (usually a round friction head with a diameter of 16mm) and fix it with a rubber band or a fixing clip to ensure that there is no looseness or wrinkles.
3. Fix the sample
Spread the sample to be tested flat on the test bench or flat table and fix it with a clamp to prevent movement.
4. Manual friction test
Dry friction test:
1. Press the friction head wrapped with the friction cloth vertically on the surface of the sample.
2. Apply standard pressure (usually 9N or as required by the standard).
3. Rub back and forth 10 times at a uniform speed in the straight direction (one way is about 10cm, speed is about 1 time/second).
Wet friction test:
1. After the friction cloth is soaked, gently squeeze out excess water (avoid dripping).
2. Perform the test according to the dry friction steps. After the friction is completed, remove the friction cloth and dry it immediately.
5. Result evaluation
After the friction cloth is dry (wet friction needs to be dried naturally), compare it with the standard staining gray scale sample card (such as ISO 105-A03) and evaluate the staining level (level 5 is the best and level 1 is the worst).
Record the test results of dry friction and wet friction, and use the lower level as the final evaluation.
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