Color Fastness To Washing
The “colorfastness” of a colored textile is defined as its resistance to these changes when subjected to particular conditions. However, it follows that colorfastness must be specified in terms of these changes and expressed in terms of the magnitude.
Color Fastness To Washing Measuring Procedure
Color fastness to wash is an important test for ensuring the fastness of the colored material indeed. Basically, it is done in the dyeing lab. Besides, the testing procedure can be varying depending on the measuring procedure. In the quality assurance system, a record is maintained significantly for each lot of dyed goods or finished goods. Additionally, Computer Color Matching System (CCMS) is used to save the record.
Following materials are required for the wash fastness test. The following materials are standard for wash fastness measurement.
- Sample size 40 x 100 mm
- Multi-fiber at 40 x 100 mm
- ECE detergent (WOB)-4g/L
- Sodium Perborate (Na2BO3.H2O2-1g/L)-1g/L
- Distilled water
- Normal cold water
- Steel balls
Various types of instruments are used for it. Followings are the important ones. They are-
- Rota wash
- Stitch machine
Colorfastness to Washing Measurement Procedure:
Colorfastness to wash is an offline quality assurance system. In the following way, colorfastness to wash is carried out.
- Firstly, cut the sample and Multi-fiber at 40 x 100 mm.
- Secondly, 50 ml ECE detergent (WOB) & 50 ml Sodium perborate is taken with the sample. For marks & Spencer, the solution is taken by the following formula: (Sample fabric + Multi-fiber weight) x 50 ml.
- Thirdly, the sample is kept at 600C for 30 minutes in Rota Wash Machine.
- After that, rinse the sample twice with cold water.
- Then, dry at 600C by hanging or by Flat iron pression but the temperature should not be more than 1500C.
- Lastly, dry the specimen and the change of shade & degree of staining that is measured in the Grey Scale & Staining Scale.
So, we should be care full during the measurement of the wash fastness of textile materials.