Application of colorimeter in various industries

Application of colorimeter in Paper Industry:
In the paper industry, the color of paper is also an important factor for the quality of paper. The use of a colorimeter to detect the color of paper and quickly analyze and control the color difference problem has become one of the more commonly used statements in the paper industry. Paper is very important whether it is packaged, printed or printed. If consumers see a page in a batch of books with obvious color difference from other colors, their first impression is very poor, and the quality of this book is very poor. In order to avoid the occurrence of such things, it is essential to control the color difference effectively and quickly.

As for the assessment of color difference, if it is conducted only by human vision, it will be affected by subjective factors and environment, which is easy to cause objections and disputes between manufacturers and customers. However, the use of color difference meter measurement can be as objective as possible, and the quantification of color depth and color difference size can enable manufacturers and customers to understand the color information of paper simply and quickly, and avoid unnecessary disputes and losses. This is also the most popular method in the world’s paper industry at present. At present, the formulas for measuring color difference with color difference meter include ANLAB, CIELAB, CMC, Hunter, etc. The company uses 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 the paper, attention should be paid in the paper making process. In the process of paper making, color measurement is very important, it is the basis of color difference measurement. All colors can be described by three attributes: lightness, hue and saturation (chroma), which can be represented by a three-dimensional spatial value. The lightness (L) indicates the brightness of the object surface. The white lightness is the highest, the black lightness is the lowest, and the gray lightness is between white and black; Bright colors have higher lightness, while darker colors have lower lightness. Hue (H) The characteristic that colors differentiate from each other, which is represented by various visual tones. Saturation (C) refers to the purity of color, which is related to the brightness of color. This can prevent and control the chromatic aberration by detecting these three indicators in the process of paper color mixing and dyeing.

The so-called colorimeter is the visual difference between two colors. Color difference is an important indicator of quality inspection in paper industry, and the measurement of color difference is very important. This is because customers and manufacturers always hope that the color of products produced is within the specified allowable range and matches the required color, so as to ensure the consistency of book printing color.

Because the uneven color space makes it difficult to calculate the color difference, people are based on finding and establishing a uniform color space and its corresponding color difference formula to maintain the visual consistency with people, so that the calculation of color difference is simple and clear. The △ E value of CIELAB color difference formula we choose is obtained from the functional formula of color difference of color tristimulus values (three values related to color attributes) △ L, △ a, and △ b, The color difference values of these three different attributes are always uneven, so it is necessary to find a color difference formula consistent with visual inspection.

Application of colorimeter in tea quality detection:
Now it is not new for industrial production to use colorimeter to detect product color. Many large factories have begun to use this precision instrument to control product color and strive for the best product color quality. The fact also proves that the use of color difference meter to control product color is very accurate and fast, providing the most scientific and perfect quality management method for color quality management of industrial batch production. In recent years, the application of color difference meter in color management and safety detection of food industry is also increasing, mainly because the color difference meter can clearly give various color indicators of food by virtue of the analysis of Lab value, according to which the freshness and nutritional value represented by different color of food can be analyzed, and finally the food quality can be controlled in this way.

Tea color refers to the color of tea in its natural state. It is closely related to the quality of tea and can reflect the quality of tea to a certain extent. In the evaluation of the sensory quality of tea, the color of dry tea, the color of soup, and the bottom of leaves account for three of the eight factors of the sensory quality of tea. According to the color of finished tea, tea is divided into green tea, black tea, green tea (oolong tea), yellow tea, black tea, and white tea to form their own quality characteristics.

Tea color is a comprehensive reaction of various pigments. Except for the higher content of theaflavin and thearubin in black tea, the content of other pigment substances is less. The content of one or several pigments determined by physical and chemical methods is difficult to represent their color status. However, evaluation through human senses will be affected by many factors, and the reproducibility of the small differences between their qualities is poor. In view of this, people began to turn to other instruments to distinguish colors. Since the 1970s, some people in Japan have applied color difference analysis to the determination of tea color. The L *, a * and b * color systems have uniform colors, which are the most consistent with human vision and the most intuitive. They are the best color system for tea color measurement. The instrument is used to quantify the evaluation of tea color by using the method of color difference meter to determine the color of dry tea, tea soup and leaf bottom.

Later, Qihong was taken as the research object, and the correlation between the color of dry tea and the color of leaf bottom and the quality of Gongfu black tea was established. It was believed that the color value of dry tea appearance was a simple and rapid method to evaluate the quality of Gongfu black tea. The color of roasted green tea was determined by the above method. The multiple correlation coefficient between the color value of dry tea powder and the color fraction of soup was 0.9405, the multiple correlation coefficient between the color value of tea soup and the color fraction of soup was 0.9051, and the multiple correlation coefficient between the color value of dry tea powder and the total quality score was 0.9369. It was considered that it was feasible to use this method to manage the quality of roasted green tea.

LISUN lauched Portable Colorimeter/Chroma Meter is an innovation color measuring tool with powerful configuration to make color measurement easier and more professional; It support Bluetooth to connect with Android and ISO devices, Portable Colorimeter/Chroma Meter will take you into a new world of color management; It can be widely used to measure color value, color difference value and find similar color from color cards for printing industry, paint industry, textile industry, etc.

Lisun Instruments Limited was found by LISUN GROUP in 2003. LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.

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