The rating methods used in textile color fastness ratings are mainly eye inspection and instrument inspection. The results obtained by instrument inspection are only one value. The stability of the results for normal hue changes is relatively high, but it is caused by some special reasons. Discoloration, through the instrument test will not reflect the real situation of the sample. Eye inspection is a sensory test, and it is a comprehensive conclusion that is relatively close to the correct value. Therefore, many inspection agencies still use eye inspection. However, eye inspection is subject to objective and human subjective factors and results in errors in the assessment results. In the rating, attention should be paid to the following matters in order to reduce the generation of errors, thereby improving the accuracy and authenticity of the test results.
1. Evaluate the environment:
In order to avoid the influence of external light, the rating is best carried out in a darkroom. The surrounding environment is neutral gray. It is recommended that the uniforms worn by the rating staff are also gray and that other debris cannot be placed next to the light box to affect the vision.
2, the evaluation of the perspective:
The rated table is at a 45-degree angle, and the angle between the eyes and the sample is vertical. Therefore, the staff needs to adjust their seat height according to their height.
3, the choice of light source:
The rated light source requires the D65 light source to be selected according to the standard, and it must not be rated under natural light or general lighting conditions. The results of different rating environments will differ by at least half a degree.
4, the order of ratings:
Ratings staff are required to evaluate large batches of samples in a variety of colors on a daily basis, due to the different color light stimuli that bias the ratings. It is advisable to select a certain rating order according to colors. If there are dark or light colors, you can evaluate light colors first and then comment dark colors to avoid the eye being stimulated to make the rating error.
5, the person's own state:
The technical level of the rating personnel determines the accuracy and stability of the rating of the visual rating, and the emotional and mental status of the rating personnel will affect the stable performance of their technical evaluation level, thus affecting the accuracy of the rating results. Therefore, it is recommended that the rating personnel do not perform color fastness ratings in the case of lack of sleep, bad mood and eye fatigue, otherwise the results of the assessment will be very large.
6, paste the sample:
The direction of the warp and weft, the direction of the line, and the position of the pattern of the sample shall be the same, and the direction of the fluff on the pile fabric (such as corduroy) should be consistent. If the deviation is large, especially the fabric with fluff, Deviation level 2 is possible.
7. Analysis of the evaluation process:
Color fastness rating results include discoloration and staining.
(1) The color fastness to color change can be any change in hue, depth, brightness, or color, or it can be a combination of more than two or three features. Therefore, a comprehensive analysis is required when evaluating, rather than simply observing the sample. The change of a prominent feature. For some special samples, if they cannot be expressed in full by the numbers, they can be supplemented by written expressions.
(2) stain fastness, should pay attention to the color of the different lining stained, such as: polyester is relatively bright and shiny, wool yellowish luster is poor, the rating needs to consider these factors to enter, so that the final assessment of the The results will be more objective and accurate.
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