Color mixing skills and ink mixing skills of colorimeter assisted printing industry

Color mixing principle: In the actual measurement with a colorimeter, we mark the measured data coordinate system as a static coordinate point (called the starting point). In order to ensure the stability of the printing color phase during the printing process, the inker needs to adjust the ink ratio and viscosity at any time, so that the measurement can be made after each adjustment, and other coordinate points (dilution point, black point and key point) can be marked on the coordinate map, There will be a certain movement direction and distance between the two different coordinate points formed before and after each adjustment (the distance along the coordinate axis a and b is different, depending on the product).

If we compare this value with the value displayed on the colorimeter Δ a、 Δ b、 Δ L、 Δ E and other data are combined to display a series of dynamic points on the coordinate system. Then, the direction and distance between these dynamic points become the qualitative and quantitative reference of which kind or several kinds of color ink should be added and the amount of color ink added by the inker in the actual operation, which is equivalent to the compass and measuring ruler in the daily inking work.

Printing color mixing skill Ink mixing skill:
With such tools as color-difference meter, even new employees can get started quickly in ink mixing work, and will not be confused in theory, and the old employees will be more comfortable. Of course, to achieve this effect, we need to find the coordinate points and dynamic points of each product on the coordinate map.

1. According to Δ a、 Δ b、 Δ The L value determines the adjustment direction and amplitude. If Δ L is a positive value, indicating that the sample is whiter (less black) or lighter than the standard sample, and a negative value indicates that the sample is darker or darker than the standard sample (high ink color concentration, deep printing plate engraving, thick printing ink layer); If Δ A is a positive value, indicating that the sample is redder than the standard sample, and a negative value indicates that the sample is greener (less red) than the standard sample; If Δ B is a positive value, indicating that the sample is yellow than the standard sample, and a negative value indicates that the sample is blue (yellow) than the standard sample.

2. In case of the need for black accentuation, Δ L changes in the negative direction, and when the ink is diluted or diluted or the printing machine is accelerated, Δ L changes in the positive direction.

3. Because the color of transparent objects is determined by the transmitted color light, and the color of opaque objects is determined by the reflected color light, so when adjusting the red, blue, green, brown and other inks with strong coverage and the clean and transparent yellow and other inks, their corresponding point coordinates Δ a、 Δ The change direction of b value is opposite.

a. After adjusting the color density of red, blue, green, brown and other inks with strong hiding power, the corresponding point moves towards the center of the circle in the figure according to the speed increase of the printing machine, Δ a、 Δ B The change direction and size are consistent with those shown on the coordinate map; After adjustment such as start-up speed increase, ink dilution or dilution, the corresponding point moves outward with the speed increase of the printing machine from the center of the circle, Δ a、 Δ B The change direction and size are consistent with those shown on the coordinate map.

b. After adjusting the color concentration of clean and transparent yellow ink with weak covering power, the corresponding point will move outward with the increase of the speed of the printing machine from the center of the circle, Δ a、 Δ B The change direction and size are consistent with the coordinate map; After making adjustments such as start-up speed increase, ink dilution or dilution, the corresponding point moves towards the center of the circle with the speed increase of the printing machine, Δ a、 Δ B The change direction and size are consistent with those shown on the coordinate map.

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.

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