1. For each batch of coated paper, before being put into use, a series of printing suitability issues such as smoothness, acidity, alkalinity, absorbency, dryness, stretchability and surface bonding strength of the paper should be tested and analyzed. For the characteristics of the paper, adopt corresponding technological measures, such as adjusting the viscosity, fluidity, dryness and anti-sticking measures of the ink, so as to realize standardized scientific production and prevent the occurrence of poor printing;
2. It is necessary to adjust the pad technology and printing pressure to ensure that the printing ink layer is even and bright. The printing pressure of coated paper should be even and appropriate. Excessive pressure can easily cause poor powder loss, and it is easy to cause unclear dot printing and increase the wear of the printing plate. On the contrary, it is easy to cause the dot pattern not to be strong, and to blindly increase the ink layer to compensate for the lack of pressure caused by the layout of the flower, so that it is easy to produce sticky, slow drying, overprinting and other undesirable consequences, so the pressure of the coated paper should be even , To be appropriate. It is better to use neutral hard material for the lining.
3. Use copperplate paper to print trademarks and packaging products, often using light color as the base color, which is overprinted. Inappropriate printing process in this way may easily cause some problems and affect the quality. Therefore, when preparing the base color ink, it should try to use heat-resistant and light-resistant inks, and the diluent is best to use bright paste, so that the base color can be put In the end, the printing effect is better, in order to prevent the background color from printing and rubbing the ink layer.
4. Due to the smooth surface of the copper plate and poor ink absorption capacity, when printing a large-format field plate, try to achieve "deep ink thin printing". That is, the ink phase should be adjusted to be deeper, so that the ink layer is correspondingly thinner when printing, which can meet the requirements of the printing hue, and can reduce the chance of overprinting, and can prevent overlapping colors from being printed. In addition, due to the poor adhesion of the paper, the printed ink layer is sometimes susceptible to decolorization due to powder loss. For this reason, No. 19 resin oil can be used as the adjusting ink for the first color printing. In order to make the superimposed ink layer printed bright, you can add some bright oil and dry oil in the ink.
5. Due to the large amount of paint on coated paper, it is often encountered in the printing process that the powder is removed and the printing plate appears black. In this case, you should pay attention to check whether the plate mounting process operation, such as whether the printing plate is too heavy, because the pressure on the paper surface is too large, it is easy to crush the coating powder on the surface of the coated paper, resulting in dedusting Shadow spots. In addition, you should also check whether the viscosity of the ink is appropriate. If the printing ink layer is too thick and too sticky, it is also one of the reasons that causes the paper to fall off and accumulate the layout. In this case, you should consider using auxiliary materials to adjust the ink Quality, the above quality problems can be better overcome.
6. The anti-sticking technology for printing on art paper should be properly controlled. The coated paper has weak ink absorption and the back is relatively smooth. In this way, printing with a large ink receiving surface or multi-color overprinting is easy to cause sticking problems. Therefore, anti-sticking measures should be taken to overcome it. Stir the anti-sticking agent evenly, make it into a liquid state, add it to the ink and mix it evenly, you can get a good anti-sticking effect when printing. However, the amount of anti-sticking agent should be controlled reasonably, and should not exceed 4%, so as to avoid the emulsification of the ink, the printing of the ink layer, and the decline of the gloss of the ink layer.
Summarizing the above six main points, as long as you grasp the characteristics of coated paper and keep a good watch in the printing process operation, you can ensure the printing efficiency and printing quality.
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