The color fastness of fabrics is affected by many factors, among which conditions such as washing, friction, perspiration, acid and alkali are the most likely to cause the color fading of the fabric. Similarly, other conditions can also cause the fabric to fade. Influenced by natural light, the engineer of this article (Hong Kong) Co., Ltd. will introduce to you the experimental method for
testing the color fastness of fabrics to artificial light. 1. Purpose 1. The prepared test samples are required to be uniform and representative 2. Master the experimental method of color fastness to artificial light of textiles 2. Principle Textile samples and a set of blue wool standard samples are exposed to the sun under artificial light source according to specified conditions, and then the samples and blue wool standard samples are discolored and compared to evaluate the color Fastness. For white (bleached or optically brightened) textiles, the color fastness is assessed by comparing the change in whiteness of the sample with the blue wool standard. three. Sample preparation 1 . Blue wool standards 1 to 8 The blue wool standards developed and produced in Europe are numbered 1 to 8. These standards are blue wool fabrics dyed with the dyes in Table 1, which range from 1 (very low color fastness) to 8 (very high color fastness). 2. Blue wool standard sample L2 ~ L9. The blue wool standard samples developed and produced in the United States are numbered 2 to 9, and the letter L is marked before the numbers. 3. The humidity control standard in the humidity control standard is a cotton fabric dyed with red azo dye. The calibration of the standard is to place it in some specific places at different times of the year, facing the south, and at the same time, place the standard in some sealed containers with constant air humidity from 0 to 100%. There are not many kinds of results, the main result is that when exposed to the sun in the area specified by GB/T 8426, the light fastness of the humidity control standard sample is 5 grades. 4. Specimen The size of the specimen can vary, depending on the number of specimens and the shape and size of the equipment specimen holder. Usually the sample area used is not less than 45 mm×10mm. If the sample is fabric, it should be attached to the hard card; if the sample is yarn, it should be tightly wound on the hard card, or fixed in parallel on the hard card; if the sample is loose fiber, combing and finishing It is fixed on the hard card into a uniform thin layer. Each exposed and unexposed area shall not be less than 10 mm. Four. Test method 1. European exposure conditions: The specified blue wool standard samples 1 to 8 are used for this condition. a) Normal conditions (temperate zone): moderate effective humidity (see humidity control standard), humidity control standard 5, maximum black mark temperature 50°C (see BST). b) Limit conditions: In order to test the sensitivity of the specimen to different humidity during exposure, the following limit conditions can be used: 1) Low effective humidity:——Humidity control standard 6 to 7 grades;——The maximum black mark temperature is 65℃. 2) High effective humidity:——Humidity control standard grade 3;——The maximum black mark temperature is 45℃. Note: The temperature measured with a black-panel thermometer (BPT) is 5°C lower than that of a black-label thermometer (BST). 2. Exposure conditions in the United States: The specified blue wool standard samples L2 to L9 are used for this condition. Blackboard temperature (63 ± 1) °C. The relative humidity in the instrument test box is (30 ± 5)%, the effective humidity is low, and the color fastness of the humidity control standard sample is 6 to 7 grades. 3. Operation procedure 1). Put a piece of not less than 12mm×The 10 mm humidity control standard is mounted on the hard card together with the blue wool standard, and is placed in the middle of the sample holder as far as possible 2). Place the assembled sample holder on the sample holder of the equipment . All vacancies on the sample holder should be filled with sample holders without samples but with hard clips. 3). After turning on the neon lamp, the equipment needs to run continuously until the test is completed. 4) Expose the partially covered humidity control standard sample and the blue wool standard sample at the same time, until the color difference between the exposed and unexposed parts of the humidity control standard sample reaches level 4 on the gray sample card. 5). At this stage, evaluate the light fastness of the humidity control standard. 4. Exposure Method 4.1. Method 1 This method is considered to be the most accurate and should be used when the rating is contested. Its basic feature is to control the exposure cycle by checking the sample, so each sample needs to be equipped with a set of blue wool standard samples. Arrange the sample and the blue wool standard as specified, and place the cover AB on the middle third of the sample and the blue wool standard. According to the specified conditions, exposure to the sun. Lift the cover AB from time to time to check the lighting effect of the sample, until the color difference between the exposed and unexposed parts of the sample reaches the gray sample card level 4. Continue exposure until the color difference between the exposed and unexposed portions of the specimen is equal to grade 3 on the gray scale. If the fading of blue wool standard sample 7 or L7 reaches gray sample card level 4 before the sample, the exposure can be terminated at this time.
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