The so-called "ink crystallization" refers to the improper control of the printing interval of the two-color ink. The ink printed first has been dried before overprinting the one-color ink. Due to the low viscosity of the dry ink layer and its ability to be wetted by the ink, it is difficult for the next color ink to adhere to it.
Generally, this phenomenon occurs in the ink overprinting of monochrome offset presses. In order not to cause ink crystallization failure, the ink layer that is printed first must generally have the following conditions:
(1) Maintain a certain degree of wettability, which can be wetted and attached by post-printing ink.
(2) Maintain a certain viscosity, and the adhesion of the post-printing ink is greater than the cohesion of the post-printing ink.
(3) Control the amount of desiccant (dry oil).
If there is a printing process failure of "ink crystallization", the surface of the printed ink can be rubbed with fine gauze to make the surface of the ink film rough and increase the capillary absorption force to improve the effect of ink overprinting. For "ink crystallized" prints with large printing areas and large batches, it is best to first overprint the ink with high viscosity on the surface of the ink, use its strong adsorption to attach to the dry ink layer, and then use it As a medium, the post-printing ink adheres well.
[Case 2-11]:
A factory used a monochrome folio offset printing machine to print 100,000 floral almanacs, with a pattern of one red peony, paper of 128g /? Double copper, and quick-drying and bright ink. When the sky blue was overprinted after the yellow and magenta were printed, it was found that the sky blue ink was difficult to adhere in many places on the way.
[case study]:
This is a typical "ink crystallization" phenomenon. The reason for this phenomenon is that the paper used has poor ink absorption, the second is the use of fast-drying bright ink, and the third is that the amount of white paper is too large. Therefore, for this kind of situation, pay special attention to the amount of white paper put into the monochrome offset press to be properly controlled, and to change the color sequence appropriately.
Treatment method: Due to the large number of prints, it is necessary to cover the oil first, and then print. Remember to plan well when you next print.
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