What is the job of color matching before printing, how to adjust it, and how to adjust it by color matching personnel?

Calculate the ink consumption of each color printing number to make the ink amount appropriate. Especially for two-liquid reactive ink, the mixing amount of ink should be calculated according to its curing speed and printing speed. In order to get the correct color, ink mixing should be carried out under stable natural light, and several colors should not be observed side by side to avoid the influence of illusion.

When preparing bright colors, the addition of dark ink should be gradually approached, and it is forbidden to add too much at one time, and then use a lot of light ink to remedy it. At the same time, try to reduce the mixed hue. The more tones, the greater the gray scale.

In addition, we should also pay attention to the color changes before and after drying, such as light-colored substrates with large ink absorption, and the ink color after drying is often lighter; The color difference of foaming ink in wet state, dry state and foaming state is large; The hue of ceramic printing ink changes dramatically after firing; Bai Mo will turn yellow at high temperature. Such a color change law requires printers to accumulate experience and samples in practice and formulate their own color standards.

Extended data

Pay attention to three points when mixing colors:

1. When mixing inks, try to add less inks of different colors. The fewer kinds of color inks, the better the mixing effect.

2. Using the principle of "from shallow to deep", be careful when the hue of light or bright ink is close to the sample. It is best not to mix the inks produced by different manufacturers, and try to use the inks of different colors from the same manufacturer for color matching, otherwise it will cause uneven color tone, which will lead to condensation in serious cases and make the ink scrapped.

3. Some screen printing inks are dried by drying. Light color is lighter after drying than before, and dark color is deeper after drying. In addition, it is easy to ignore whether the color tone of ink is different before and after drying in printing.

Generally speaking, through natural drying (solvent volatile ink), the substrate is plastic, metal, paper, glass and so on. , and the color will not change; But if it is a pigment for ceramics, because it is colored after combustion and oxidation, it can only be colored by experience.

As mentioned above, the color of screen printing ink dried by thermosetting and photocuring changes deeply. When the ink mixing amount is large, the ink mixing machine can be used to complete the color mixing in a short time.

Reference source: Baidu Encyclopedia-Preparation of Screen Printing Ink

Reference source: Baidu Encyclopedia-Printing Spot Colors