UV offset ink manufacturers share tips for gold ink
When the machine ink, ink roller with kerosene, gasoline just cleaning, retention on the surface of the organic solvent has not completely volatilize, namely immediately for gold ink printing, so that gold ink and the solvent reaction caused by discoloration; If in the background printing gold should pay attention to add dry oil in the background color, so as not to overprint gold ink, gold ink will affect the luster color.
A gold Offset Printing Ink made of a special linker and gold powder. According to the golden light can be made into blue light, red light, red light three color gold ink; According to the type of offset gold ink, letterpress gold ink, gravure gold ink, screen printing gold ink.
A few points to note when printing gold ink
Aureate can give a person the feeling with luxuriant nobility, the metallic colour with golden twinkle, also be spectral colour place cannot behave. Therefore, gold ink printing is widely used in packaging and decoration printing technology, to improve the image of goods play a better role. However, as the main raw material of gold ink is brass powder, it belongs to active metal in chemistry, easy to produce discoloration, therefore, we should pay attention to the following situations when printing gold ink:
Gold ink is easy to contact with air, water vapor and chemical reaction caused by discoloration, so to do a good job in the custody of gold powder, do not let it casually exposed to air, unused gold powder should be tightly covered;
Due to the unstable chemical properties of gold powder, if it comes into contact with acid, alkali, carbon and sulfide, it will produce chemical changes of varying degrees. Reduced metallic luster, gold ink will be black. And gold ink should be avoided for printing large areas of domestic coated paper, coated paper, because the use of acid paper production process paper acid, printing gold ink not only change color, but also lose luster;
Soy Offset Printing Ink Supplier says deployment of metal ink auxiliary materials, should not use acid auxiliary materials, and should use neutral substances deployment;
The use of gold ink should master the principle of adjustable with printing, that is, a deployment should be suitable for continuous printing about 3 hours, so as not to make too much of the gold powder in the oil for too long, contact with the air oxidation deterioration and lose the golden luster;
Gold ink printing machine speed should not be too fast, because the machine speed fast roller friction heat increases correspondingly, so that it is easy to make gold ink oxidation black. Therefore, the printing speed should be controlled in 3000 / h;
Offset printing gold fountain solution, should be used with acid or gum fountain solution, in order to avoid acid fountain solution and gold powder reaction, so that the printing ink becomes dark and lose luster;
When printing gold, the cots should be adjusted, and the position of each cots should be adjusted accurately, so as to avoid poor ink transfer in the printing process caused by the inking, so that the gold powder in the cots for a long time of friction, causing gold ink oxidation color;
Printing gold ink semi-finished products should not stack too much, otherwise gold ink in the paper drying process released by the heat can not be released as soon as possible, will also make gold ink oxidation color;
When the machine Soy Ink, ink roller with kerosene, gasoline just cleaning, retention on the surface of the organic solvent has not completely volatilize, namely immediately for gold ink printing, so that gold ink and the solvent reaction caused by discoloration; If in the background printing gold should pay attention to add dry oil in the background color, so as not to overprint gold ink, gold ink will affect the luster color.