Qingdao Linhe Printing & Packaging Co., Ltd.


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Several common problems and solutions of coated paper printing

June 29, 2022

Coated paper is widely used for printing. What problems will the coated paper encounter in the printing process and how to solve it? The following are some points that Qingdao Linhe Printing has organized for you, hoping to help you.

paper card

  1. Due to the smooth surface of coated paper and poor ink absorption capacity, when printing large plates on site, "deep ink and thin printing" should be achieved as much as possible. Qingdao Linhe Printing and Packaging believes that the ink phase should be appropriately deepened to make the ink layer corresponding or thinner, which can not only meet the requirements of printing colors, but also reduce the chance of overprinting and prevent overlapping printing. In addition, due to the poor adhesion of paper, the printing ink layer is sometimes easily decolorized due to powder falling off. Therefore, No. 19 resin oil can be used as a varnish for printing the first color.

  2. 2. It is necessary to strictly control the pad technology and the printing pressure adjustment to ensure that the ink layer is uniform and bright.The copperplate printing pressure should be even and appropriate. Excessive pressure is likely to produce peaks, etc., and it is easy to cause the defects of unclear dot printing and increase the wear of the layout. On the contrary, it is easy to cause the dot imprint to be weak, and blindly increase the ink layer to make up for the smearing of the layout due to insufficient pressure, so that it is easy to produce dirty, slow drying, overlapping and other adverse consequences.

  3. When printing trademarks and packaging products, the light color of coated paper is usually used as the base color, and it is overprinted by overlapping colors. Improper printing process is also easy to cause some problems and affect the quality. Therefore, Qingdao Linhe Printing and Packaging believes that when preparing base color ink, heat and light-resistant ink should be selected as much as possible, and the diluent should preferably be prepared with whitening paste, so that the base color is in the The final printing effect is better to prevent the base color from being easily worn and damaged by the ink layer.

  4. Qingdao Linhe Printing and Packaging recommends that before each batch of coated paper is put into use, a series of problems such as smoothness, acidity, alkalinity, moisture absorption, dryness, flexibility and surface bonding strength of the paper should be tested and analyzed, and corresponding measures should be taken. process measures. According to the characteristics of the paper, the viscosity and fluidity, dryness, anti-stickiness and other measures of the ink are adjusted to achieve standardized scientific production and prevent poor printing.

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Qingdao Linhe Printing and Packaging believes that it is necessary to check whether the ink viscosity is appropriate at the end. If the printing ink layer is too thick and thick, it will also cause the paper surface to fall off and accumulate on the layout. In this case, auxiliary materials should be considered to adjust The quality of the ink, the above quality problems will be better overcome.