Treatment method of chemical reaction of ink during gravure printing
Double-liquid inks or reactive inks will gradually undergo chemical reactions such as cross-linking during the printing process, resulting in poor fluidity, increased viscosity, and reduced transfer rate, resulting in blockage.
Through the analysis of the reasons for gravure blocking, the following solutions are summarized.
(1) The temperature and humidity of the printing workshop should be suitable, and the drying speed of the solvent must be compatible with the printing speed and printing environment.
(2) The distance between the doctor blade and the impression cylinder should be as short as possible, and prevent the hot air leaking from the drying box from directly blowing the printing plate layout.
(3) Mix slow-drying solvents to increase printing speed appropriately.
(4) When the plate blocking failure is caused by the defect of ink performance, the replacement of ink should be considered. When changing the ink, first clean the ink tank and circulation pump thoroughly, then pour in new ink and try to avoid mixing inks with significant density differences together.
(5) Always stir the ink in the ink tank to keep the ink in all parts flowing. New ink should also be added or replaced in time to avoid ink film.
(6) Before starting or immediately after starting, wipe the plate cylinder with solvent. During the printing process, it is necessary to avoid stopping halfway. If you stop for a long time, you must first clean the printing plate or immerse the printing plate cylinder in the ink tank and keep continuous idling.
(7) When using new ink, due to temperature difference and other reasons, crystal precipitation of additives, waxes and other substances in the ink will occur, so the new ink should be heated to 40-50 ℃, after the crystal precipitate is dissolved use.
(8) Use regular special dilution solvents.
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