Label printing is not as simple as some people think, but it needs to be refined. The following Jinan label printing company introduces the phenomenon of imprint pulverization in printing, and explains our solution: how to avoid the phenomenon of pulverization in printing effect.
Some substrate, especially polishing coating and clay coating enamel products, because there is not enough adhesion to hold the ink firmly on the substrate surface, they usually only absorb the ink blending oil in the ink and leave the particles of gold and silver pigment on the surface. In the process of paper printing, after the ink is transferred to the paper and dried, when rubbing the imprint with hand, part of the imprint is wiped off, which is called imprinting pulverization failure.
Powdering causes the metal color to peel off from the substrate surface. The reason for the pulverization of imprinting is mainly due to the pores on the paper surface adsorbing the linker in the ink. In particular, the loose paper has strong ink absorption. After the ink is transferred to the paper in the printing process, the ink connecting material will more penetrate into the paper, so that some pigment particles can not be surrounded by the connecting material. On the paper surface, the imprint will be powdered, especially with the self-made gold and silver ink inking oil, which is more prone to powdering failure.
The main causes of pulverization are as follows:
① the concentration of inking oil is insufficient, and the content of permeable substances is more. Even if the texture of paper is not very loose, the excessive penetration of connecting materials will cause the imprinting to be powdered.
(2) gold and silver ink is made of gold and silver powder and ink blending oil. The affinity between the powder and the binder is poor. When transferred to the paper surface, too much connecting material is separated from the gold and silver powder and permeated into the paper, resulting in the pulverization of the imprint.
In view of the above reasons, when printing gold and silver ink, it is necessary to print the background color ink once, and then print gold or silver ink by means of overprinting. On the one hand, the use of background ink reduces the paper's absorption of gold and silver ink connecting materials; on the other hand, printing gold and silver ink when the background ink is not completely dry can make the gold and silver ink firmly combined with the background ink and avoid the pulverization of the imprint. In addition, in order to avoid pulverization failure, the amount of water should be set to the minimum, which is because ink with higher water saturation is more prone to pulverization.
When brushing on the high coated paper or enamel surface, a proper amount of desiccant should be added to the ink. Before printing with gold or silver ink, the substrate surface is usually sealed with a conventional oil-based transparent white ink coated with glue. If the phenomenon of pulverization has occurred, printing another layer of ink on the first surface will often make up or reduce this phenomenon. Adding ink transfer oil can also overcome pulverization, but this will affect the luster of the metal. For best results, it is recommended to use metal plate instead of electrostatic plate, which can avoid excessive glycerin or glycol contained in the fountain solution, because these non-volatile liquid media will slow down the drying speed.
The above is about how to avoid pulverization introduced by Jinan label printing company. For more information, please visit http://www.jingyinshua.com