The so-called "bite color" is the phenomenon that after the overprinting, the dried ink of the previous color dissolves and pulls back again. The bite color is generally manifested as four kinds of phenomena: "fat flower", "scratches", "white spots" and "tailing".
The phenomenon of color biting failure is similar to other failure phenomena, but has its own characteristics:
â‘ When the color bite is serious, the ink of the previous color will stick to the dissolving ink of the previous color, and even "dye" the ink disk of the next color.
â‘¡ The ink transfer of the previous color is normal, but the ink layer is pulled down by the latter color after overprinting. We only need to compare the state of the previous color ink layer before and after overprinting, and we can clearly confirm whether it is a bite failure, not As for other failures that are similar to it, they are mixed.
The essential reason for the color seizure phenomenon is that the solvent component of the post-printing color is too soluble in the dried ink film of the previous color, and the following factors should be noted when dealing with color seizure failures:
1. The matching of different types of inks.
At present, printing companies often use the inks of 2-3 ink factories for matching. For example, black ink uses Toyo, blue and red inks use slightly better quality inks, and yellow and white inks use cheaper inks. The rationalization of the value between the quality and the price. Due to the differences in the ink formulation design of different manufacturers, pay attention to the effect of overprinting and whether there is bite color when using it in combination.
2. The matching of specific ink type and machine speed.
The formula design of high-speed printing ink has strong re-dissolving ability to the dried ink film. If it is used for low-medium-speed printing, the color shift phenomenon will easily occur due to the longer contact transfer time. The color bite phenomenon is not entirely a problem of ink quality. It is more important to pay attention to the matching with the actual application conditions. In the case of a slight bite, the increase in machine speed can help reduce bite failure.
3. Properly adjust the solvent formula of the next stack of printed colors (reduce the amount of true solvent), reduce the re-dissolving power of the dried ink film of the previous color, and slow down the color biting phenomenon.
4. Appropriately increasing the viscosity of the next stack of printing colors or blowing the wind on the next color layout (use caution when there are layers or small text) will also help to slow down the color biting phenomenon.
5. The pressure during the next stack of printing should not be too large. The greater the pressure, the worse the bite phenomenon.
6. When using old ink that is close to deterioration in the previous color, the color is prone to bite.
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