Washing Color Fastness refers to the situation of fade and discoloration of dye textiles when soaping. The main machines used in washing color fastness are Washing Color Fastness Testers. Generally, there are two indicators measured in washing colorfastness test, including testing fade of original sample and staining of white cloth. Fade of original sample is the color change of dyed textiles before and after soaping. Staining of white cloth is the situation of staining of white cloth which it is soaping together with dyed fabrics.
In the testing, dyed sample is stitched together with one or two specified woven fabrics, placed in a soap solution, mechanically stirred at a specified time and temperature, then rinsed and dried. At this moment, dyed sample fades and contaminates the white adjacent fabric. Discoloration of dyed sample and staining of adjacent fabric are measured by gray cards. Water color fastness is divided into 5 grade and 9 files, among which the best is grade 5 while the worst is grade 1.
In the actual work, the testing items are mainly determined according to the final use of the product and the product standard. For example, the wool textile product standard stipulates that the light fastness must be tested, and the knitted underwear, of course, has to be tested for perspiration fastness. Outdoor textiles (such as umbrellas, lampbox cloth, canopy materials) are naturally tested for weather fastness. Here is an example of how to test washing colorfastness.
Color fastness to wash is an off line quality assuance system. By the folloning way, color fastness to wash is carried out.
1. Cut sample and Multifiber at 40x 100 mm.
2. 50 ml ECE detergent (WOB) & 50 ml Sodium per borate is taken with the sample. Formarks & Spencer, the solution is taken by the following formula: (Samlple fabric +Multi· fiber weight) x 50 ml.
3. The sample is kept in 60 degrees for 30 minutes in Rota Wash Machine.
4. Rinse the sample twice with cold water.
5. Dry at60 degrees by hanging or by Flat iron pession but temperature should notbe more than 150 degrees.
6.Dry the specimen and the change of shade & degree of staining is measured by Grey Scale & Staining Scale.
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