Color difference in printing, also known as color bias, is one of the typical drawbacks of printing and packaging in the whole process, in the process of processing, often produce printed matter and proofing sample color does not meet the situation, or pattern design interface after overprinting mixed color failure, light harm product quality, serious will make the whole batch of products scrapped, just like we buy things on the Internet, Merchants always note in the product picture "there may be color deviation, please refer to the actual color."

1, the actual operation of printing plate is not standard caused by yellow, magenta, green a color dot is too deep or too light.

The key here is that in the whole process of printing plate, the compression strength of the ink printing lamp source, the spectrometer is not matched with the light induction characteristics of the printing plate, or the exposure time is not good, the PH value of the developer and the length of its development time are not appropriate, which will lead to the printing plate dot is too deep or too shallow.

2, the printing ink color preparation is not good or the three primary color printing ink is not consistent.

That is, it is not the same well-known brand, the same printing ink. For the positive and back packaging and printing of goods, we must pay attention to the deep light of the positive and back, and often compare with the light ink of the back of the goods, to avoid the more heavy or more light printing and endangering the quality of the goods. For the goods of the separated page puzzle pictures, try to distribute them in the same machine and equipment, the same train package and printing, otherwise, it will lead to serious quality accidents.

3, the color sequence distribution is not scientific, the key refers to the color sequence distribution of multi-color custom puzzle books printing machine.

4. The packaging and printing paper itself has a serious color bias.

5, the blank on both sides of the printing plate is seriously dirty, resulting in mixed color conditions (mostly seen in semi-satellite custom puzzle books printing machine).

Properly grasp the balance of ink and brush, pay attention to the PH value of the wet liquid, in the same amount of ink, more water and less water will harm the dark and light tone, the principle of water consumption is not to hang dirty, using the minimum amount of liquid supply.

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