custom lift-up flaps book is an image printing company. We must pay attention to the color difference in printing. If there is a color difference, the product will lose its beauty. The following Shanghai Jinghao color box to take you to understand the printing color difference problem caused by poor ink in Shanghai custom lift-up flaps book, I hope to help you.

The thickness and viscosity of the ink layer are not suitable for printing color difference. When printing, only the moderate and uniform ink layer can better ensure the ink quality of the printed matter and effectively prevent the occurrence of printing sticky flowers. If the ink layer is thick, its viscosity will increase accordingly, which is easy to cause the phenomenon of paper falling off and rough in the printing process, and then affect the color uniformity of the printing ink.

However, if the ink layer is thin and the ink viscosity is too small, the ink color of the printed matter will become lighter, and the visual effect of the printed matter will be poor. On the other hand, due to the thixotropy of the ink, with the increase of the running time of the printing press and the acceleration of the printing speed, the friction coefficient of the machine increases, the temperature of the ink gradually increases, and the viscosity correspondingly decreases, making the ink color more and more light, and the color difference is formed due to the inconsistency of the ink color before and after the batch of products.

Therefore, these factors must be fully considered when inking, and the appropriate ink concentration should be adjusted according to the climate, temperature conditions and characteristics of the printing press to reduce the chance of color difference in printing, so that the ink color is relatively stable. However, in the actual printing process, the viscosity of the ink will inevitably be reduced. Under normal circumstances, the first printing ink color is relatively strong, and then it will gradually fade. In this way, the ink output can be gradually increased by adjusting the rotation Angle of the iron bar, so that the ink color is basically the same before and after printing. When mixing intermediate colors and multi-color inks, try to avoid the difference between the mixed ink and a large proportion, so as to avoid the ink causing a large proportion of difference in the ink bucket, in the printing process, the phenomenon of "stratification" (that is, precipitation and suspension), resulting in printing color difference.

In order to maintain the continuous and uniform transfer of ink, we should often stir the ink in the ink bucket with an ink knife. In addition, during the printing process, because the thickness of the ink layer in the ink barrel is significantly reduced, it is easy to reduce the gap between the ink barrel plate and the ink wheel, thereby reducing the output of the ink and making the ink color of the print lighter. In order to avoid this happening, we should also pay attention to adding ink to the ink bucket, so that the ink in the ink bucket will always be maintained. In order to prevent the ink viscosity changes affecting the ink color balance, the contact between the roller and the iron roller should not be too tight, the roller should not be too hard, in order to minimize the impact of friction heat on the thixotropy of the ink, reduce the dilution of the ink.

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