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Non-woven Color Fastness Test Method Professional Tutorial, How To Judge The Color Fastness Based On Color Fastness Level

Oct 22, 2019

Color fastness test

With the development of the application of non-woven fabrics, many non-woven fabrics are required to maintain a certain color in the process of use, so they need to be dyed or printed with dyes and pigments. However, in the process of using the treated non-woven fabric, due to various external factors will lose color, and the evaluation of color fastness, generally simulation of wearing, processing, environment and other actual conditions, the development of the corresponding color fastness test method and color fastness standards. As the actual situation is very complicated, these experimental methods are only an approximate simulation. According to the change of color of the sample before and after the test, the grade of color fastness can be obtained by comparing with the standard sample card or blue standard sample. General dyeing fastness is divided into five grades, such as soap washing, rubbing, sweat stains and other fastness, one of the worst, five best. Sun fastness, climate fastness is divided into eight grades, one of the worst, eight best.


Dyeing products have different requirements for fastness due to different USES. Dyestuffs with comprehensive dyeing fastness are often expensive or complicated, so practical and economical dyestuffs should be selected according to different requirements of dyeing products. For example, as a disposable non-woven cloth, washing opportunities are very few, so do not require a high degree of washing fastness, so the color half-degree test of non-woven cloth is mainly friction color fastness.


Rubbing fastness to wet and dry. Dry rubbing fastness after rubbing and dyeing the fabric with dry bleached cloth, observe the white cloth cleaning condition. Wet rubbing fastness is to dry dyed fabrics with 100% wet bleached cloth containing water and observe the staining of white cloth. The test method is to take 8cmx25m samples in two pieces. One for rubbing fastness to dry and the other for rubbing fastness to wet. During the test, the test sample shall be paved on the test bench of the friction fastness tester. After the test sample is firmly pressed, another 5cmx5cm bleached plain cloth shall be taken and fixed on the friction head. The direction of warp and weft of the bleached plain cloth intersects with the direction of warp and weft of the tested sample at 45°. Then put the friction head on the test cloth and rub it back and forth 10 times, each time about 1 second. A sample shall be ground three times separately on the front. Then according to the "color fastness clean color sample card" rating.


大发麻将When testing the wet rubbing fastness, the fine cloth on the friction head should contain 100% water. The grading should be done after drying.

The color fastness to rubbing is also classified into 5 grades, with 1 being the worst and 5 being the best.


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