What are the methods for testing color fastness of fabrics?
Everyone will encounter this situation in life, that is, the darker the color of the clothing, the more obvious the fading will be. For example, black clothing will turn white after being washed several times. In fact, fiber fabrics like these During use, discoloration will occur due to various external factors such as exposure, cleaning techniques, friction between clothes, and chemicals. If you want to maintain the dyeing fastness of clothes, you must The finishing process goes through extraordinary craftsmanship, so what are the methods for testing the dyeing fastness of fabrics?
Testing method for fabric dyeing fastness
Generally, when evaluating dyeing fastness, it is divided into 3-4 levels. So how to determine the level of fastness will be based on the following standards , one of the standards is light fastness, which is also the most common way to test dyeing fastness. In the judgment process, it is divided into 8 levels. Level 1 is worse and level 8 is better. The method is to use the fabric in pieces Randomly select a piece of fabric sample and put them under the sun. After 8 hours of exposure, special instruments will be used to detect their respective fading conditions.
From the perspective of soaping fastness
Of course, the fabric dyeing fastness testing method, in addition to sun exposure, can also be inferred from soaping, before cleaning , a piece of white cloth will be sewn on the sample cloth, so that the change in washing fastness can be seen more clearly, and then put into the washing machine, and then cleaned according to normal operation. This method is a quick test. The method is divided into 5 levels during the judgment process. Level 1 is severe fading and level 5 is non-fading. Generally, if you want to quickly test the dyeing fastness, you will choose this method. Compared with the sun exposure method, Much faster and more convenient.
Washing/dry cleaning dye fastness
Test the fabric samples under certain washing conditions (temperature, alkalinity, friction, etc.), and then use gray cards to rate the samples , the color comparison results show that the water-washing dye fastness of the samples of turquoise, scarlet, and navy blue is poor. The test principles of dry cleaning and water washing are the same.
Friction dyeing fastness
It is to put the fabric test sample on the rubbing fastness tester for testing. The test content includes dry/wet rubbing test. After the experiment, you can use ash Cards are color graded.
Perspiration/water stain fastness
The test method is similar to the washing dye fastness, except that the sample is tested under sweat or water stain conditions, and then the results are Compatible with sweat stain liquid.
The above is a test method for fabric dyeing fastness after finishing. I hope that after reading the article, you will have a better understanding of the fabric dyeing fastness testing method. understanding.
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