The color fastness of fabric dyeing is affected by many factors, among which conditions such as washing, friction, perspiration, acid and alkali are the most likely to cause the fabric to fade and fade. Similarly, the influence of other conditions can also cause the fabric to fade. For example, the influence of light includes artificial light and For the influence of natural light, the engineer in this article will introduce to you the experimental method for test
ing the color fastness of fabric to artificial light. 1. Purpose 1. The test samples are required to be uniform and representative. 2. Master the test method of textile color fastness to artificial light. Principle 2. Principle The textile sample and a set of blue wool standard samples are exposed to the artificial light source under the specified conditions, and then the sample is compared with the blue wool standard sample to evaluate the color Fastness. For white (bleached or fluorescent whitening) textiles, the whiteness change of the sample is compared with the blue wool standard sample to evaluate the color fastness. three. Sample preparation 1. Blue wool standard samples 1～8 The blue wool standard samples developed and produced in Europe are numbered 1～8. These standard samples are blue wool fabrics dyed with the dyes in Table 1. Its range is from 1 (very low). Color fastness) to 8 (very high color fastness). 2. Blue wool standard samples L2～L9. The blue wool standard samples developed and produced in the United States are numbered 2-9, with the letter L in front of the numbers. 3. The humidity control standard in the humidity control standard sample standard is cotton fabric dyed with red azo dye. The calibration of the standard sample 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 sample in some sealed containers with a constant air humidity ranging from 0 to 100%. There are not many types of results. The main result is that when exposed to the area specified by GB/T 8426, the light fastness of the humidity control standard sample is grade 5. 4. The size of the sample sample can be changed, depending on the number of samples and the shape and size of the equipment sample holder. The sample area usually used is not less than 45 mm×10 mm. If the sample is fabric, it should be tightly attached to the hard card; if the sample is yarn, it should be tightly wound on the hard card, or arranged in parallel and fixed on the hard card; if the sample is loose fiber, it should be combed and pressed. A uniform thin layer is fixed on the hard card. Each exposed and unexposed area should not be less than 10 mm. four. Test method 1. Exposure conditions in Europe: The specified blue wool standard samples 1-8 are used in this condition. a) Normal conditions (temperate zone): medium effective humidity (see humidity control standard sample), humidity control standard sample level 5, maximum black mark temperature 50℃ (see BST). b) Limit conditions: In order to test the sensitivity of the sample to different humidity during exposure, the following limit conditions can be used: 1) Low effective humidity:-Humidity control standard sample 6-7 level;-Maximum black mark temperature 65℃ . 2) High effective humidity: ——3 levels of humidity control standard; ——The highest black mark temperature is 45℃. Note: The temperature measured with a blackboard thermometer (BPT) barium l is 5℃ lower than that with a black standard thermometer (BST). 2. Exposure conditions in the United States: The specified blue wool standard samples L2～L9 are used in this condition. Blackboard temperature (63 ± 1) ℃. 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 samples is 6-7. 3. Operation procedure 1). Install a humidity control standard sample of not less than 12mm×10 mm together with the blue wool standard sample on the hard card, and place it in the middle of the sample holder as much as possible 2). The sample holder is placed on the sample holder of the equipment. All the empty spaces on the sample rack should be filled with sample holders without samples but loaded with hard cards. 3). After turning on the 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 the level 4 of the gray sample card. 5). At this stage, evaluate the light fastness of humidity control standard samples. 4. Exposure method 4.1. Method 1 This method is considered to be the most accurate and should be used when the rating is disputed. Its basic feature is to control the exposure cycle by inspecting the samples, so each sample needs to be equipped with a set of blue wool standard samples. The sample and the blue wool standard sample are arranged as required, and the cover AB is placed in the middle third of the sample and the blue wool standard sample. According to the stipulated conditions, expose to the sun under the lamp. Lift the cover AB from time to time to check the light effect of the sample until the color difference between the exposed and unexposed parts of the sample reaches Grade 4 on the gray scale. Continue to expose until the color difference between the exposed and unexposed parts of the sample is equal to level 3 of the gray scale.
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