Regarding the application of paper, it involves all aspects of human society, whether in life or work, it needs to be used. For different uses of paper, the color is also various, the most common in people's life is white. So here comes the question? The color of paper is an important criterion for evaluating its appearance quality. How about controlling these color differences? The color difference meter plays a very critical role in this process, it can analyze and control the color difference problem very quickly.
For the evaluation of color difference, if it is only based on human vision, it will be affected by subjective factors and the environment, which will easily cause objections and disputes between manufacturers and customers. However, using a Colorimeter to measure can be as objective as possible, and at the same time quantify the color depth and color difference, so that manufacturers and customers can easily and quickly understand the color information of the paper, and avoid unnecessary disputes and losses. popular method. At present, there are ANLAB, CIELAB, CMC, Hunter and other formulas for Colorimeter to measure color difference. However, our company adopts the CIELAB color difference formula to measure, calculate and evaluate the color difference of paper products, and effectively prevent and control the color difference phenomenon.
In fact, to control the color and color difference of paper, we should pay attention to it during the papermaking process. In the process of paper copying, the measurement of color is very important, it is the basis of color difference measurement. All colors can be described by three attributes of lightness, hue and saturation (chromaticity), and these data can be represented by a three-dimensional space value. Lightness (L) indicates the brightness of the surface of the object. The brightness of white is the highest, the brightness of black is the lowest, and the brightness of gray is between white and black; the brightness of bright colors is higher, and the brightness of darker colors is lower. Hue (H) The characteristic that distinguishes colors from each other, manifested as visually various hues. Saturation (C) refers to the purity of the color and is related to the vividness of the color. In the process of coloring and dyeing of paper, the detection of these three indicators can achieve the effect of preventing and controlling color difference.
The so-called color difference meter is to measure the visual difference between two colors. Color difference is an important indicator of quality inspection in the paper industry, and the measurement of color difference is very important. This is because customers and manufacturers always hope that the color of the product produced will match the required color within the specified allowable range, so as to ensure the consistency of the printed color of books and periodicals.
Because the uneven color space makes it difficult to calculate the color difference, people base themselves on finding and establishing a uniform color space and its corresponding color difference formula to maintain consistency with human visual inspection and make the calculation of color difference simple and clear. The CIELAB color difference formula we choose The △E value of the color is obtained from the color difference of the color tristimulus value (three values related to the color attribute) △L, △a, △b. The color difference values of these three different attributes are always uneven, so It is necessary to find a color difference formula that is consistent with visual inspection.
The above are some applications of the Colorimeter in detecting the color appearance quality of papermaking, hoping to provide some references for users in related industries.
