How to use ink in gravure printing
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1. The plate is made of electro-engraving plate or laser plate. The plate depth is between 15μ and 20μ. This is because the ink is produced by tap water, and its boiling point is higher than the solvent. The shallow version can increase the printing speed and avoid water ripple. If the solvent ink is used for printing on the plate 35μ~40μ deep or above, water ripple will occur. However, if the ink is printed on the plate more than 25μ, there will be water ripple phenomenon. It is important to use a good plate.
2. Good drying equipment, the drying temperature should be determined according to the difference of the substrate, the printing area, such as the printing of the metal foil, the drying temperature is above 100 °C, and the printing and drying temperature of the plastic film is 60 ° C -80 ° C is appropriate, the wind should be stronger than when printing with solvent ink, because in addition to temperature, there should be strong wind, so that the ink can be quickly dried on the substrate.
3. In addition to metal aluminum foil, vacuum aluminized film, paper, all plastic films need to be treated by electric spark before printing with ink. The surface of the plastic is 40~42, and the ink produced by using water as the main solvent is due to water. The surface tension is about 72 dyne, so the difference between the tension of the ink and the tension of the film affects the adhesion, thereby increasing the surface tension of the plastic film and enabling good adhesion of the printed pattern.
4. Before printing, after the ink is poured into the ink tank, the printing plate is idling for 2-3 minutes, the purpose is to wet the printing plate and stir; in the printing process, in order to observe the printing, it is necessary to stop printing. The plate stops rotating and the plate is prevented from causing a plate.
5. Before printing, according to the depth of the plate to adjust the printing viscosity, try not to add tap water in the printing process, as long as the new ink with the same viscosity can be added, because the ink is in the printing process, at 1 hour at 32 °C, who The volatilization is only 1.2%, and the viscosity change is small, so the ink maintains the same color of the printed product and improves the pass rate of the printed matter.
6. After printing, immediately clean the printing plate, pour the ink into the barrel, put the water into the ink tank, rotate the plate for cleaning or adjust the 3% washing powder solution for cleaning.