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Your location: Home > Related Articles > GB8427 Experiment Lightfastness Tester

GB8427 Experiment Lightfastness Tester

Author:QINSUN Released in:2023-08 Click:17

GB/T 8427-2008 \"Testing Color Fastness of Textiles by Artificial Light Xenon Arc Color Fastness\" is a widely used standard in the textile industry. T 8427-1998 has been revised. Light color fastness tester is the test equipment for experiments. Qisnun Precision Electromechanical Technology Co., Ltd. is the manufacturer, with high cost performance and prompt and comprehensive after-sales service.

my country\'s woolen spinning industry has always used method 3 to measure color fastness to light woolen textiles, and its product standards stipulate that and light color samples The allowable fastness is 4 grades and 3 grades respectively, and the whole exposure period is more than 40 hours, which is more convenient and quick. This method is also used in other industries such as clothing, knitting, etc.. (the color fastness index of the product standard is generally 4 grades), and various textile testing institutions are also interested in its short cycle characteristics and use this method to test the color fastness of various textiles. Color fastness to light. However, for products that require high color fastness to light, such as specialty textiles, the color fastness to light index is about 6. It is obviously inappropriate for such products to refer to the methods of the woolen spinning industry. It seems there is only one way to choose. 2 is more appropriate. Of course, you can also go in the sun according to method 3. If the permitted hardness is 6 degrees, according to method 3 regulations, you must test with grade 6 and 5 blue labels. The exposure cycle will from grade 6 blue tags to gray card 4 andgray card 3. Level, so the test period does not differ from method 2. It is also worth pointing out here that some product standards stipulate that the allowable solidity index of the product is 3-4 grades and claims to perform the test according to method 3. This is obviously wrong, because using the experimenter cannot choose the blue label for the experiment. The standard states that the permissible strength index of the product is 3-4 grades. If you choose grade 4, it will be half a grade above standard; if you choose grade 3, it will be half a grade below standard. It is the manufacturers of product standards who do not understand method 3, which leads to difficulties and confusion for the users of the standards. This example shows that sometimes other factors, rather than the method itself, create barriers to using the method.

Therefore, the basic principle for us to choose thehe exhibition method is not to blindly consider the cycle and cost, but also to consider the characteristics of the method and samples and the provisions of product standards. To ensure scientific and accurate data, choose optimized and streamlined testing methods.

Gray sample card level

Determination of exposure time of blue wool standard sample

People usually choose the exposed part and unexposed swatch or blue wool standard swatch The color change between equal grayscale 4 and 3 is used as a reference to control the exposure time. The reason for choosing grayscale level 4 and 3 is that the color difference is more obvious when the human eye reaches grayscale level 3, and it is more scientific to note at this time. Moreover, the curve between △E* and time representing the changecolor of the standard blue wool sample in this range is almost linear and the results are more consistent. And in GB250-1995, it is also pointed out that the value of △E* corresponding to level 4 of the gray sample card is 1.7±0.3, and the value of △E* corresponding to level 3 of the card gray sample is 3.4 ±0.4.