PVC gift plastic packaging printing generally adopts a neutral or neutral hard lining, and the pressure of the ink roller on the printing plate can not be too large, otherwise it will cause a paste version of the scene.
When printing, the ink layer on the printing plate is often transferred to the surface of the paper or the rest of the printing material, the ink is often missing, even the bottom exposed scene. Therefore, in order for the gold ink to reach a saturated state, it fully exhibits its own metallic luster and generally adopts a secondary printing method. At present, there are two basic methods of secondary printing: the first is to print fake gold ink as the background color, and then to overprint gold ink; the other is to directly print gold ink twice. The fake gold ink used in the former method is usually prepared by using yellow yellow or medium yellow yellow ink as the main ingredient. If the paper is loose on paper and the paper surface is flat, the false gold ink is mainly yellow, and it will participate in the appropriate amount of gold ink.
If the paper is tight and the paper surface is smooth, adopt transparent yellow plus a small amount of gold ink to allocate fake gold ink. When printing, the background ink should be as small as possible, with the principle of not revealing the bottom and not seeping. When the undercoat ink is not completely dry, the gold ink may be overprinted, and the amount of ink may be slightly larger, so that the talent can reach the saturation state of the gold ink. When adopting the latter method, it is also necessary to emphasize that it is appropriate to overprint the second pass of gold ink when the first printing of the gold ink is not completely dry. This is because the gold powder in the gold ink is a metallic pigment. Dry and reprint, the particles are not easy to stick.
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