Rubbing fastness: Rubbing fastness is the resistance to fading of dyed textiles when rubbed against a rough surface.the fastness to crocking or rubbing is widely used on a variety of fabric to evaluate the transfer of surface dye from the test fabric when it is applied surface friction or rubbed against a rough surface,two types of rubbing test are done-
Dry
Wet
Apparatus:
Crock meter
Grey scale staining
Procedure
Test specimen 15cm x 5cm (may be more, it has no effect) is placed on the base of the Crockmeter.
A square of white test cloth (5cm x 5cm) which is of plain weave, desized, bleached but without finished cotton fabric (as ready to dye)is taken.
White test cloth is attached to the finger of the crockmeter.
rubbing is done, to and fro 10 cycle at 10seconds, i.e.20 rubs in 10s and finger pressure on the specimen is 9N.
For testing dry and wet rubbing, separate sample is used.
Rubbing test is done both for warp way and weft way.
For wet rubbing, sample is dry but white test cloth is wet. for wetting,M:L ratio is maintained not less than 1:50,water is drained after wetting and not squeezeed.
Dry
Wet
Apparatus:
Crock meter
Grey scale staining
Procedure
Test specimen 15cm x 5cm (may be more, it has no effect) is placed on the base of the Crockmeter.
A square of white test cloth (5cm x 5cm) which is of plain weave, desized, bleached but without finished cotton fabric (as ready to dye)is taken.
White test cloth is attached to the finger of the crockmeter.
rubbing is done, to and fro 10 cycle at 10seconds, i.e.20 rubs in 10s and finger pressure on the specimen is 9N.
For testing dry and wet rubbing, separate sample is used.
Rubbing test is done both for warp way and weft way.
For wet rubbing, sample is dry but white test cloth is wet. for wetting,M:L ratio is maintained not less than 1:50,water is drained after wetting and not squeezeed.
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