Some substrates, especially polished and clay-coated enamel products, do not have enough adhesion to firmly hold the ink on the surface of the substrate, often only absorb the ink adjustment ink in the ink, and the gold and silver pigment Particles stay on the surface. In the printing process of the paper, after the ink is transferred to the paper and dried, when the hand is rubbed on the blot, part of the blot is wiped off. This phenomenon is a powdering failure of the blot.
The powdering phenomenon causes the metal color to peel off from the surface of the substrate. The reason for the powdering of the print is mainly due to the capillary holes on the surface of the paper adsorbing the connection branch in the ink. Especially the paper with loose paper has strong ink absorption. After the ink is transferred to the paper during the printing process, the connecting material of the ink will penetrate into the paper more, so that some pigment particles cannot be surrounded by the connecting material. On the top, it causes powdering of the imprint, especially the self-made gold and silver ink ink, which is more prone to powdering failure.
The main reasons for pulverization are:
â‘ The concentration of the ink is insufficient, and the content of penetrating substances is large. Even if the texture of the paper is not very loose, it will cause powdering of the print due to excessive penetration of the connecting material.
â‘¡Gold and silver ink is made of gold and silver powder and ink. The affinity of powder and binder is poor. When transferred to the paper surface, the excessive connection material is separated from the gold and silver powder and penetrates into the paper, causing powdering of the imprint.
In view of the above reasons, in the printing of gold and silver ink, the background ink should be printed again, and then, the gold ink or silver ink should be printed by the method of overprinting. On the one hand, the background ink is used to reduce the absorption of gold and silver ink on the paper; on the other hand, the gold and silver ink is printed when the background ink is not completely dry, which can make the gold and silver ink firmly combine with the background ink to avoid the powdering of the blot . In addition, in order to avoid powdering failures, the amount of water should be set to a minimum, because inks with higher water saturation are more prone to powdering.
When brushing on highly coated paper or enamel surfaces, an appropriate amount of desiccant should be added to the ink. Before printing with gold or silver ink, the surface of the substrate is usually sealed with a conventional oil-based transparent white ink coated with gum. If pulverization has already occurred, printing another layer of ink on the surface of the first layer will often compensate for or alleviate this phenomenon. Adding printing ink can also overcome powdering, but this will affect the gloss of the metal. For best results, it is recommended to use a metal plate instead of an electrostatic plate, which can avoid the fountain solution contains excessive glycerin or ethylene glycol, because these non-volatile liquid medium will slow down the drying speed.
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