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Factors affecting the rating of textile color fastness


Textile color fastness rating the rating is the main wa […]

Textile color fastness rating the rating is the main way for inspection and test of two eyes instrument, instrument inspection and the result is only a numerical stability is higher for the hue change was normal, but for some special reasons causing discoloration, through the instrument test response was not the real situation of sample. Eye test is a sensory test, is a comprehensive and relatively close to the correct value of the conclusion, so now a lot of testing agencies or the eye test, but the error of eye inspection is easy to be affected by subjective factors and objective people due to the evaluation results, so the ratings in the notes of the following aspects in order to reduce the error the produce, so as to improve the accuracy of test results and authenticity.
1 Evaluation Environment: in order to avoid the impact of external light, the rating is best in the darkroom, the surrounding environment color is neutral grey, suggest wearing overalls rating personnel is the best light gray, and can not be placed beside other visual impact debris.
2, the evaluation of the angle: the rating of Taiwan is 45 degrees angle, eyes and the sample angle is vertical, so people in the rating, according to their own height for proper seat adjustment.
3, the choice of light source: rating of the light source, according to standard selection of D65 light source, and not in natural daylight or general lighting, light rating, different rating environment results will be at least half a level.
4, the order of evaluation: rating personnel need to assess a large number of samples of various colors every day, due to different chromatic light stimulus, resulting in rating deviation. It is recommended to choose a certain grading order according to the color. If you have dark or light color, you can first evaluate the light color and then evaluate the dark color, so as to avoid eye irritation and make the grade error.
5 personnel of their own state: the technology level of rating personnel determines the accuracy and stability of quasi rated visual rating, rating the emotional and mental state will affect the technology assessment levels stable play, thus affecting the accuracy of the assessment results. Therefore, it is recommended that the rating staff should not make a color fastness rating under the condition of lack of sleep, poor mood and eye fatigue. Otherwise, the results will be highly variable.
6 samples, the original paste: longitude and latitude direction and sample ridge orientation and type of position to match fabric (such as corduroy) on the reverse direction along the villus to keep consistent, whether it can be a big deviation, especially with downy fabric, deviation of level 2 are possible.
7 analysis of the evaluation process: color fastness rating results include color change and staining. (1) color fastness can be arbitrary hue, brightness, color depth, a change can also be two or three features of the above changes in the portfolio, so when assessing the need analysis, rather than simply observing the specimen a prominent feature of the change. For some special samples, if they cannot be expressed by numbers, they can be expressed in words and complete. (2) fastness, should pay attention to different lining color before the color, such as: bright shiny white polyester, wool yellow gloss poor rating when they need to take these factors into consideration, so the final evaluation results will come out more objectively and accurately.

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