Imprinting powdering fault and its elimination method
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The pulverization phenomenon causes the metallic color to peel off from the surface of the substrate. The reason for the pulverization of the imprint is mainly due to the adsorption of the connection in the ink by the capillary pores on the surface of the paper. In particular, the loose paper has strong ink absorption. After the ink is transferred to the paper during the printing process, the ink connection material penetrates into the paper more, so that some pigment particles cannot be surrounded by the connecting material. In the above, the pulverization of the imprinting, especially the self-formed gold and silver ink varnish, is more likely to cause pulverization failure.
The main reasons for the phenomenon of chalking are:
1 The concentration of the varnish is insufficient, and the content of the permeable substance is large. Even if the texture of the paper is not loose, the pulverization of the embossing may occur due to excessive penetration of the binder.
2. Gold and silver ink is made up of gold and silver powder and varnish. The affinity of the powder to the binder is poor. When transferred to the paper surface, too much binder is detached from the gold and silver powder and penetrates into the inside of the paper, causing the print to be pulverized.
In view of the above reasons, in the printing of gold and silver ink, it is necessary to print the ground color ink first, and then print the gold ink or silver ink by overprinting. On the one hand, the bottom color ink is used to reduce the absorption of the gold and silver ink connecting material; on the other hand, when the ground color ink is not completely dried, the gold and silver ink is printed, so that the gold and silver ink and the ground color ink can be firmly combined to avoid the imprinting powder. . In addition, in order to avoid pulverization failure, the amount of water should be set to a minimum because inks with higher water saturation are more susceptible to pulverization.
When brushing on high coated paper or enamel surfaces, an appropriate amount of desiccant should be added to the ink. Prior to printing with gold or silver ink, the surface of the substrate is typically sealed with a conventional oil-based clear white ink coated with a sizing. If the pulverization phenomenon has occurred, reprinting a layer of ink on the surface of the first layer will often compensate or alleviate this phenomenon. Printing varnish can also overcome the pulverization, but this will affect the luster of the metal. For best results, it is recommended to use a metal version instead of an electrostatic plate. This will prevent the fountain solution from containing excessive amounts of glycerin or glycol, as these non-volatile liquid media will slow down the drying process.