Second, a number of reasons for the poor gloss of gold and silver ink
1. The chemical properties are unstable. When gold and silver inks are heated and absorb moisture; when they come into contact with acids, alkalis, oxygen, or carbon dioxide, chemical reactions are likely to occur, causing the color to darken and darken, and the ink lacks gloss when printed. Therefore, when gold and silver ink (or gold and silver powder) are stored and stored, care should be taken to prevent heat and moisture, and to avoid contact with the above substances. Unused gold and silver ink (or gold, silver powder) should be sealed and stored to ensure the stability of their characteristics.
2. Improper deployment of gold and silver ink. If the amount of gold and silver ink is too large, the use time exceeds 4 hours, so that the gold and silver ink on the machine is prone to oxidation and black and dark when in contact with the air and water vapor for a long time, which affects the gloss of the printed ink. To avoid this, The occurrence of a bad phenomenon, printing gold, silver ink should be used with the tune, usually a deployment of the amount of continuous printing for three or four hours is appropriate.
3. The paper characteristics do not apply. The coated paper, whiteboard paper and offset paper produced by the acid papermaking process will produce adverse reactions after printing gold and silver inks, making the gold and silver inks on the prints easy to darken and lack gloss. In addition, non-coated paper in the high humidity environment, chemical pulp sulfide and barium sulfate in the filler material, will also make the paper on the gold and silver ink black and lose gloss. Therefore, in order to improve the glossiness of gold and silver ink printing, paper, paperboard containing no acid, should be used for printing.
4. Printing speed is too fast. When printing gold and silver ink, if the speed of the machine exceeds 3,500 sheets per hour, the friction coefficient of the ink roller on the machine is obviously increased, and the heat generated by the ink can cause the gold and silver ink to oxidize and turn black and affect the glossiness. Therefore, the printing is affected. The speed of gold and silver inks should be controlled as low as possible, and can usually be controlled between 2000 and 3000 sheets per hour.
5. The machine is not cleaned regularly. If the machines for printing gold or silver ink continue to operate for three or four hours, the ink fountains, ink rollers and other components on the machine will be significantly heated, which will accelerate the oxidation of the gold and silver ink on the ink fountain and the ink roller to change their color. Dark and darkened. Therefore, when printing gold or silver ink, it is recommended to clean the ink fountain and ink roller every three or four hours, and replace them with new ones for printing so that the gloss of gold and silver inks can be guaranteed.
6. Printed semi-finished products are too high. When printing gold and silver ink, if the semi-finished product sheets are stacked too high, the heat released by the ink layer during the drying process cannot be smoothly and timely emitted, and the gold and silver inks will also be oxidized and discolored and blackened. Therefore, when printing, attention should be paid to controlling the stacking height of semi-finished products. It is best to use a paper holder to separate semi-finished products.
(to be continued)
1. The chemical properties are unstable. When gold and silver inks are heated and absorb moisture; when they come into contact with acids, alkalis, oxygen, or carbon dioxide, chemical reactions are likely to occur, causing the color to darken and darken, and the ink lacks gloss when printed. Therefore, when gold and silver ink (or gold and silver powder) are stored and stored, care should be taken to prevent heat and moisture, and to avoid contact with the above substances. Unused gold and silver ink (or gold, silver powder) should be sealed and stored to ensure the stability of their characteristics.
2. Improper deployment of gold and silver ink. If the amount of gold and silver ink is too large, the use time exceeds 4 hours, so that the gold and silver ink on the machine is prone to oxidation and black and dark when in contact with the air and water vapor for a long time, which affects the gloss of the printed ink. To avoid this, The occurrence of a bad phenomenon, printing gold, silver ink should be used with the tune, usually a deployment of the amount of continuous printing for three or four hours is appropriate.
3. The paper characteristics do not apply. The coated paper, whiteboard paper and offset paper produced by the acid papermaking process will produce adverse reactions after printing gold and silver inks, making the gold and silver inks on the prints easy to darken and lack gloss. In addition, non-coated paper in the high humidity environment, chemical pulp sulfide and barium sulfate in the filler material, will also make the paper on the gold and silver ink black and lose gloss. Therefore, in order to improve the glossiness of gold and silver ink printing, paper, paperboard containing no acid, should be used for printing.
4. Printing speed is too fast. When printing gold and silver ink, if the speed of the machine exceeds 3,500 sheets per hour, the friction coefficient of the ink roller on the machine is obviously increased, and the heat generated by the ink can cause the gold and silver ink to oxidize and turn black and affect the glossiness. Therefore, the printing is affected. The speed of gold and silver inks should be controlled as low as possible, and can usually be controlled between 2000 and 3000 sheets per hour.
5. The machine is not cleaned regularly. If the machines for printing gold or silver ink continue to operate for three or four hours, the ink fountains, ink rollers and other components on the machine will be significantly heated, which will accelerate the oxidation of the gold and silver ink on the ink fountain and the ink roller to change their color. Dark and darkened. Therefore, when printing gold or silver ink, it is recommended to clean the ink fountain and ink roller every three or four hours, and replace them with new ones for printing so that the gloss of gold and silver inks can be guaranteed.
6. Printed semi-finished products are too high. When printing gold and silver ink, if the semi-finished product sheets are stacked too high, the heat released by the ink layer during the drying process cannot be smoothly and timely emitted, and the gold and silver inks will also be oxidized and discolored and blackened. Therefore, when printing, attention should be paid to controlling the stacking height of semi-finished products. It is best to use a paper holder to separate semi-finished products.
(to be continued)
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