Tabletop Light Fastness Tester TF421

The factors affecting the sunlight fastness of the material 1 the structure of dyes

Generally speaking, anthraquinone dyes and phthalocyanine dyes have relatively strong sunlight fastness. Besides, most insoluble azo dyes also have higher sun fastness while aniline-typed azo has weak sun fastness. And triarylmethane is not sun resistant.

2 the type of fiber

There is also a great difference between the same dye but made of diverse fibers. For example, indigo in wool can be resistant to sunlight while the sunlight fastness on cellulose is very low.

3 the dye concentration

The sun fastness of the same dye in the same variety of fibers will change with changes in dye concentration. Generally speaking, the dye with low concentration has a higher fastness than that with low concentration, especially for the azo dyes.

4 the influence of external conditions

Air moisture content and the degree of temperature also have a great impact on the sunlight fastness. Generally speaking, sunlight fastness is weaker in an environment with high moisture content. For example, vanilla blue is more prone to red fade in the south than in the northern region.

5 additives

Now there are a lot of additives that can effectively improve the sunlight fastness.

Comparison Standard Substance

According to the AATCC 16 standard, the AATCC blue wool standard samples are the first choice for all testing procedures. However, for different test procedures, the fading degree of the AATCC blue wool standard samples may be inconsistent.

In the experience of known discoloration, any suitable textile material can be used as reference material. The reference material must be selected and confirmed by both partners and exposed to the sun at the same time as the test sample.

Sample Preparation

In general, the test requires at least 3 identical sample and comparison standards to ensure the accuracy of the data. Cut the sample according to the size requirements and the warp/weft of the fabric, and mark each sample with a durable label. Fix the sample and the reference object in the frame to ensure that their surfaces are the same distance from the light source, and prevent the sample from pressing too tightly on the surface when the cover is used.

Test Method

The standard method for testing the light-color fastness has the following three methods: the sunlight experiment method, the xenon arc lamp test instrument method, and the carbon arc lamp test instrument method. The sunlight method is closest to reality, but it is difficult to adapt to modern production management because of its long test period and inconvenient operation. Therefore, the latter two methods, which are less time-consuming and easier to operate, are often used in practical work. Although the artificial light source used by the latter two methods is close to the sun, the results of the test will be affected because of the difference between the spectrum of the light source and the difference of the spectra of the various light sources. In case of any dispute, still, take the sunlight method as the mainstay.

What are the methods for testing the colorfastness of the fabric? Through this article, I think you might have gotten some information. If you want to know more, please contact us. As a professional supplier of textile instruments, we are committed to continually improving the user experience, TESTEX Textile Testing Equipment is a reliable choice for testing textile quality.

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