Printing faults related to ink (1) Ink viscosity is not suitable. The viscosity of the ink is too low, it is easy to paste the plate during printing, and the water supply must be increased. In the transmission, the water roller will also stick the ink on the plate cylinder back, making the fountain solution dirty. In addition, after the printed matter absorbs a lot of moisture, it will deform and bend, which causes difficulties in post-press processing. In addition, the ink with low viscosity and cohesion will also suffer from centrifugal flying ink during high-speed printing. If it flies onto the printing plate and is stuck back by the water roller, the fountain solution will become dirty, which in turn will cause paste. The viscosity of the ink is too high, and it is difficult to inking, especially the mesh tone can not be printed, even if the amount of ink is increased, the effect is not obvious, and the printed matter is prone to blocking. (3) The printed matter dries too slowly. This has a lot to do with ink adjustment. When printing large areas, if there are too many lipids in the ink, the lipophilicity and lipophilicity of the paper fibers will affect the evaporation and drying of the additives. Moreover, the large area after printing often needs glazing, which is more disadvantageous for the drying of the ink. In addition, you can not use too much dry oil in the high-temperature drying season. You can use an anti-sticking agent to replace part of the dry oil, and increase the amount of powder spraying to prevent adhesion. When the powder removal process can be temporarily added. Printing faults related to paper The quality of the facing paper should be strictly controlled, the strength, tightness, elongation, flatness and gloss of the paper. Indicators such as whiteness should be tested when entering the factory and ensure compliance with requirements. The color of the facial paper will affect the printing effect of the main color. The uniformity of the coating of the facial paper and the flatness of the calendering also have a great influence on the screen printing. Eye tone is the most sensitive. The deformed paper will produce wrinkles during printing, and the humidity of the workshop should be adjusted to restore the moisture content of the paper to balance. Bending paper is difficult to convey, and the air volume of the paper blowing nozzle and nozzle should be adjusted according to the degree of paper bending, and the strength of the paper feed roller should be appropriately increased to ensure good paper feeding. When printing, it should also be noted that the fiber direction of the facial paper should be perpendicular to the direction of the corrugations during boxing. For products that need to be printed twice, the paper should be loosened on time after printing, and packed tightly after the initial drying to prevent paper deformation from affecting the overprint. For the powdered paper, the viscosity of the ink can be appropriately reduced or the printing pressure can be appropriately reduced to make up, and the layout with the smallest pattern text is arranged in the first color group, so that the paper powder and paper wool are stained as much as possible when printing the first color And the printing speed should not be too fast, and the blanket should be washed frequently. For some papers with more serious powder loss and lint loss, the method of air pressure before printing or pre-printing a layer of anti-sticking agent (with a small amount of white ink) can solve the problem to a certain extent, but in the material. The consumption of energy and time will undoubtedly increase the cost, and various problems will still occur in post-press processing. Problems related to post-press processing For the products that need hot stamping, the positioning should be accurate when printing, otherwise the hot stamping displacement phenomenon will easily occur. The problems that are easy to appear in the film are blistering and wrinkling. Darkness and so on. The poor drying of the printed ink will cause the film to foam, because the organic solvent and water in the ink will vaporize and escape after hot rolling, just sealed by the film, especially when the coating speed is too fast. Some facial tissues are wrinkled and the facial tissues are not neat. Bending will cause tearing when laminating. Wrinkle. In addition, the wear of the silicone rubber pressure roller of the laminator will also cause the coating to wrinkle. Paper with high moisture content will darken after coating. For gold-printed products, if the moisture content of the paper is too large, the moisture content after coating is more difficult to volatilize, which will oxidize the black ink. The brightness of the finished product during calendering mainly depends on 4 aspects: one is the gloss and flatness of the paper; the other is the amount of oil. If the amount of oiling is too small, the brightness after calendering is poor, but if the amount of oiling is too large, the printed matter will turn yellow after calendering. Dark; third is the drying time of varnish. The drying time of the varnish should not be too long, otherwise the calendering pressure will not be flat after pressing, or the light will not be pressed, but the varnish drying time is too short, and the varnish solvent is not dry. Uncovered, after being calendered, they will stick together when piled together: Fourth, the old and new of the steel belt. The calendering effect of the new steel belt is better than that of the old steel belt.
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(2) The printed matter is easy to fade. When printing corrugated box face paper, high-gloss abrasion-resistant ink should be used to ensure that the printed pattern can withstand frequent handling and friction during transportation. Do not add gasoline when adjusting the ink, because gasoline will dissolve or crack the cohesive cross-linking substances in the ink, destroying the chain structure of the connecting material. Do not mix too much ink, otherwise the binder resin in the ink will be light; it will be separated from the colorant, so that the colorant will be suspended on the surface of the paper in powder form, and the oil and its dissolved additives will be removed by the paper The fiber is absorbed into the paper. If such a printed matter is directly attached to the corrugated sheet, scratches or discoloration are likely to occur in the production: if the film is coated, blistering and floating will occur, which is easy to peel off; if it is polished, it will easily discolor And produce scratches; if it is calendered, the varnish and color material are easy to stick back and fall off by the steel belt. 