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Multi-color Printing Ink Overprint Problem Solving Skills
- May 29, 2018 -

When the company printed a batch of handbags, the magenta dots of the latter color group and the cyan overprint of the former color group were poor, resulting in many pie spots on the printed products. Although the author has repeatedly lowered the viscosity of magenta ink and hopes to increase the rate of superimposition, it has no obvious effect. Without help, we have to reverse the order of cyan and magenta so that the issue can be completely resolved.


Case Study: Multi-color machine is completed in a very short time. The ink's overprinting mode is wet and wet. If the printing color sequence is not properly arranged, the ink overprint rate will be greatly reduced. Therefore, the following basic principles should be followed when arranging its printing color sequence according to the characteristics of the multi-color machine.


(1) Arrange the printing color sequence according to the ink transparency. First, the ink with lower transparency is printed, and the ink with higher transparency after printing is used. This can improve the color rendering effect of ink after overprinting.


(2) Arrange printing color sequence according to the area of printing plate graphic. That is, the printing area has a small ink-printing area and a large area of ink-colored printing.


(3) Arrange printing color sequence according to the ink viscosity. The ink with a large viscosity is printed first, and the ink with a small viscosity is printed afterwards, and the viscosity of the ink is reduced one by one in turn. If the ink with high viscosity must be printed on the latter color group, the viscosity should be reduced firstly with an anti-adhesive, otherwise, the reverse overlay printing failure will occur, ie, the ink color mixing phenomenon will occur. For example: When the machine's grippers are worn out, and black characters have ghosting problems, the color sequence can be adjusted to arrange the black ink in the second, third, or fourth color group, but the viscosity of the black ink should be reduced in time.


(4) Arrange printing color sequence according to the characteristics of the original. For example, when printing manuscripts mainly composed of warm colors, such as Caixia, the cyan should be placed in the former color group, magenta should be arranged behind, and the manuscripts such as glaciers and snow scenes mainly composed of cold colors should be placed in magenta. In the former color group, cyan is arranged behind.


In the above case, the cause of the malfunction is that the cyan ink is on the ground and the ink layer is thick, while the magenta ink is a light mesh and the ink layer is thin. When the magenta ink is printed on the wet and thick cyan ink layer, it will surely produce ink. The phenomenon of overprinting is poor, and printed dots are floating and irregularly increasing. As a result, markings appear and are very unfair. When the color sequence is reversed, troubleshooting is performed.


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