Determination of the color fastness to rubbing in dry and wet condition

Introduction:

The resistance of colorizing matters of the substrate towards chemical, physical, influence and other agencies of daily use expression of fastness. When colorfastness is measured against rubbing them .It is known as color fastness to rubbing resistance to color fastness against rubbing.

Objects:

• to know about crack meter
• to determine the rubbing fastness on color

 Apparatus:

• Crock meter
• Distilled water
• Sample
• Crocking scale
• Grey scale
• Emery paper

 

Grey scale & Crock meter

Machine description:

All the parts of machine is suitable on a base. A standing device is contacted with base. There is an emery paper on the base to support the sample on pinned specimen holder is used on the emery paper to base the sample. At the right side of the standing device. Operating handle is situated at the left side a finger arm is placed a loading unit is situated on the finger arm lower of the finger arm a danger is attracted. There is spring is used to hole the crocking cloth.

crock meter

Working procedure:

 Dry crocking test:-

First we take the sample of (4×1.5)

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Then the fabric is placed on the emery paper

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Pinned specimen holder is used to fixed the fabric

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After that crocking cloth is about 3×5 cm has settled with finger by spring clip

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Loading unit is applied put the finger pinned the operating handle is operated by using of hand

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We give 10 stocks the direction of every stock is 1 sec

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Then the sample is collected of composed with grey scale

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Crocking cloth is collected and compound with scale

Wet crocking:-

In the case of wet crocking test crocking cloth in wetted with distilled water and excess water is sequences that it contains its own mass of water

Then go on the process same of also

Results:-

Dry -1/2

Wet- 4/5

Color fastness identi

remarks:-

1. Sample fabric dimension must be (4×1.5) cm
2. When the fabric set on the every paper there should not any crease on fold1 1
3. 1 stroke must be taken in every second
4. For the wet crocking test, the sample must be wetted and excess water should be sequenced.