CROCKING OR RUBBING FASTNESS TEST:
The whole test gets completed in below steps:
1 - The white crock test cloth is mounted on the rubbing finger with the help of a clamp.
2 - The test specimen is fixed on the rubbing device by means of acrylic template such that the long direction of the specimen follows the track of the devices. You can
see the below figure:
3 - when the multi - coloured textile is tested for rubbing fastness, the technician should be careful about the position of the specimen in such a way that all colours of the design are rubbed in the test.
4 - If the area of the colour is large, more test specimen should be prepared and individual colour should be assessed separately.
5 - The covered rubbing finger is lowered onto the test specimen.
6 - The main power supply switch is on position.
7 - 10 turn are set into the timer.
8 - Now the power supply switch of crock meter is pushed on. The rubbing finger starts to move to and fro direction.
9 - The machine gets stopped after ten turns automatically.
10 - The white crock test cloth is removed from finger.
10 - Now this white crock test cloth is evaluated for staining with the help of 1 - 5 grey scale and rating is given. Increase in rating indicates better rubbing fastness.
All the procedure remains same as dry rubbing except the wetting of white crock test cloth.
It is wetted with water ( wet pick up 65 plus or minus 5 %.
The staining of the rubbing on cotton white cloth is checked.
Testing of bursting strength of the fabric by diaphragm burst hydraulic bursting strength teser
Testing of drape coefficient of the fabric by Cusick drape tester
Testing of crease recovery angle or crease resistance of the fabric
Testing of tearing strength of the fabric by falling pendulum (Elmendorf) tearing strength tester
Testing of fabric stiffness by using cantilever type stiffness tester
Yarn count testing, tensile strength testing and CSP calculation