The drying of ink is basically caused by the following points: the old version was not cleaned when printed. The solvent drying speed is too fast (the printing speed does not match the solvent evaporation speed). Dry hot air blew onto the plate. When the contact point between the squeegee and the plate surface and the imprinted ink are mixed with dust, moisture, air bubbles, etc., the transfer rate of the ink will be reduced due to the actual amount of ink in the mesh, and some coarse particles may even be embedded in the mesh . The accuracy and angle of the electric engraving of the net hole during plate making will also be affected. The transfer to the ink causes insufficient or missing dots. The quality of the ink and solvent is also one of the reasons for blocking the plate. If the fluidity of the ink is not good, the printing viscosity is too high, the ink has been deteriorated or mixed into different series of ink, an inappropriate solvent or solvent ratio is used, or even added Improper operation of the solvent when mixing ink will affect the transferability of the ink and cause blockage.
The effect of active particles: After printing for a certain period of time, the ink produces many active groups, which will combine with the chromium ions of the plate roller. When these combinations are in the shallow part of some gradient plates, their binding force hinders The transfer of the ink to the substrate causes blockage. The basic performance is as follows: the light screen version starts to bloom. To solve these problems, you can add active retarders (such as CHY-1 printing auxiliary) to the ink to deal with. Missing prints are mainly caused by pressing rollers, films, improper operation, etc .: uneven pressing rollers or air bubbles can cause serious missing printing. The film is corona or polluted during use, causing local corona deficiency. The amount of ink in the ink tank is insufficient, and the plate roller has partial ink shortage. There is a hard object stuck under the printing blade, and the ink will be scraped off to cause the ink mark. Missing prints due to adhesion or ink shedding. There are many reasons for the adhesion and shedding of ink. Everyone generally considers the ink, film, and solvent residue. It ignores the mismatch of the temperature and air volume during drying, the false surface drying phenomenon caused by low temperature and high air volume, and insufficient cooling of the printed film after drying These two points.
European and American countries have higher requirements for solvent residues, and the benzene content is generally not more than 0.5mg / m2. At the current printing level in China, it is very difficult for benzene content to be less than 2mg / m2. The solvent residue mainly exists in the process of printing and dry-recovery, and the benzene solvent is mainly caused by the residue of printing (if the drying channel of the dry-recovery machine is very long, the drying capacity is sufficient, and sometimes the residual solvent of printing will be evaporated Therefore, we now mainly discuss the problem of printing solvent residues.
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