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5. Paper fiber gap, surface roughness, ink absorption, caused by gold, silver ink color printing ink product brightness and paper surface gloss have a great relationship, if the paper is rough, poor gloss, gold and silver Ink printing is quickly absorbed by the fibrous tissue of the paper. Then, the brightness of the printing ink layer is poor. If offset paper, letterpress paper, and white cardboard are used to print gold and silver ink, the color rendering effect is necessarily unsatisfactory. Therefore, in order to ensure the printing quality of gold and silver inks, it is better to print gold and silver inks with good paper glossiness, such as glass or coated paper, and the printing process is better.
Third, gold, silver version of the imprint roughening and paste the reasons 1. Improper adjustment of the ink ink flow, determines the ink transfer effect and print quality. If the gold and silver inks are too thin or too thick, the blots on the edge of the layout or the negative image may become thicker or appear ill-printed. So, to what extent is the consistency and viscosity of printed gold and silver inks appropriate? This is hard to say, nor can it be standardized with a uniform standard. Because of the different performance of printers and the different printing environment temperatures, there are differences in the printing ink concentration requirements. In general, the printer has many ink rollers, fast speeds, and high printing temperatures. The gold and silver inks are thickened appropriately so that the ink will be relatively thin after being exposed to heat, which is exactly in line with the printing requirements. If the ink is adjusted to the fluidity required for printing at once, the ink in the printing becomes too dilute after the printing, and the printing easily expands.
2. Too much ink When printing gold and silver ink, if the amount of ink is too large, the ink layer on each ink roller is too thick. After being applied to the printing plate, due to the excessive amount of ink in the graphic layout, then In the process, the excess ink is bound to be pushed to the edge of the layout, making the prints hairy. Therefore, the printing of gold and silver ink should control the appropriate amount of ink to ensure print quality.
3. Padded lining When the outer liner lining repeated pad or pad sticker, the trailing portion does not stick and flutter, and the lining is not tightened and packaged, the raised edge of the plate will appear after imprinting, so it should be a good lining process technology turn off.
4. Printing pressure is emphasized When the pad version is uneven, the bottom bracket is not square enough to make the layout bow or pad pressure is too heavy, it will also cause the printing of graphic arts paste, thick, this should be a good pad version of the process technology, India The version should be flat, solid, high and low pads.
4. The crystallization of the underlying ink layer does not allow gold and silver ink to adhere. When the undercoat ink layer is excessively dry and the background color ink is printed, if the amount of dry oil is too much, the ink layer on the print will dry too quickly. After the ink layer is conjunctated, a layer of crystallized film will be formed. , so that gold and silver ink overprint can not be attached. Therefore, the amount of dry oil should be moderate.
2. The thickness of the crystallization printing ink layer caused by the overprinting of the undercoat ink layer is thick, and the brightness of the ink layer of the printing product is high, and the visual effect is better. However, if the printing ink layer is too thick and the crystal surface is formed after the conjunctiva is formed, the gold and silver ink will be difficult to print. After printing, it is easy to pull off the ink layer. Therefore, the thickness of the undercoat ink layer should be controlled. Generally speaking, The overprinted ink layer should be printed thin enough, and even the dark ink of the background color can be adjusted darker to make the printing ink thinner. It can also meet the quality requirements.
3. Overprinting time interval is too long caused by the ink layer crystallization background printing after printing, if the placement of time is too long, the ink layer is too dry, it will make the gold and silver ink overprinting can not be attached, overprinting ink color, to prevent this type of When the situation occurs, the base ink can be overprinted after printing to a degree of 89%.
After the crystallization of the underlying color ink layer, remedial measures should be taken to ensure product quality. The cloth can be used to wipe the underlying ink layer and destroy the crystalline film to enhance the gold and silver ink adhesion ability. Second, add alkaline liquid or 389 resin oil processing industrial soap tablets in gold and silver ink. Thirdly, the pressure on the printing of gold and silver inks should be appropriately increased so that the gold and silver inks will adhere firmly to the background ink. (Finish)
Gold and silver ink printing quality (2)
4. The underlay is not solid, the printing pressure is not uniform, and the gold and silver ink layers are distributed. The gold and silver inks are printed with the relief printing process. If the plywood is used as the printing plate base, the plywood is poor in solidity, the compression deformation coefficient is large, and the flatness is not Well, when printing gold and silver ink layouts, it is easy to produce printing pressure variation phenomenon, so that the printing pressure is uneven or insufficient, so that the printing ink layer is inevitably easy to generate flowers. Therefore, the printing of gold and silver ink layout should adopt a good flatness, hardness, solid strong metal tray, such as magnetic metal plate tray, aluminum tray, can better improve the printing ink quality.
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