How to prevent the printed product from getting dirty

Dirty printing is a common problem in graphic printing products. There are many reasons for the stickiness of printed products. Substrate materials, inks, ambient temperature and humidity, and printing technology operations are sources of sticky prints. Preventing the ink layer from being thicker due to the thicker printing ink layer is the main cause of ink stickiness. Printing ink layer is too thick, the printing stickiness is also correspondingly increased, and it is not easy to dry, so that after printing and stacking, it is easy to produce sticky phenomenon. Plate printing should control the ink layer, try to adjust the hue of the ink darker, so that the printing ink layer is thinner to reduce the chance of sticking. To prevent uneven printing pressure and insufficient printing pressure to achieve a uniform transfer of the ink layer. Insufficient or non-uniform, the ink layer on the plate cannot be evenly transferred to the printed product. When the printing pressure is slightly insufficient or inconsistent, the ink layer on the print appears light, and after the thickness of the ink layer is increased, it is easy to produce the sticky and dirty problems of the printed product. In order to ensure that the printing pressure is firm and even, it is better to use magnetic platen or aluminum plate as the plate printing plate. Grasp the order of the printing color registration plan prints are mostly multi-color overprinting, overprinting. Overprinting on the print ink layer makes it easier to get dirty. Because the ink surface is not easy to absorb overprinted ink, and due to the overprinting of the layout is small, the pressure traces on the back of the print is easily affected by the overprint sequence in the hue of the ink, the first anti-small area of ​​the first printing, and then overprinted Field full version. To print a cover product as an example, the text layout. In this way, since the background ink is not diluted with white ink, the overprint effect is not affected, and the black text version can be printed and then overprinted with the red solid version, so that the black layout can be highlighted as usual. Adding desiccant to the ink and printing some acidic large-scale domestic whiteboard paper and plastic board paper, in the humid climate environment, it is easy to slow down due to the ink layer of the printing ink, the press sheet is pressed for a long time, resulting in sticky. Appropriately add dry oil in the ink, so that the print should be promptly dried, so that the printing ink layer is dried through the oxidized conjunctiva, to avoid the ink layer over the bottom and sticky. The use of anti-adhesives to mix inks to improve the printing anti-sticking effect should be achieved by improving the ink printability to achieve anti-adhesion. This is to add about 3% of the anti-sticking agent to the ink and stir it evenly before printing. First, the anti-adhesive agent is diluted with a proper amount of varnish, and then added to the ink, so that the anti-adhesive agent can be evenly mixed into the ink.