Exchange of experience: how to use ink in gravure printing

1. The printing plate adopts electric engraving plate or laser plate, and the plate depth is between 15μ and 20μ. This is because the ink is produced by tap water, whose boiling point is higher than that of the solvent. Plate shallow can improve the printing speed and avoid water ripples. For example, printing with solvent ink on the printing plate 35μ-40μ deep or more will produce water ripples, and using ink printing on the printing plate 25μ or more will have water ripples, so, It is very important to use a good printing plate.

2. Good drying equipment, the drying temperature should be different according to the substrate, the size of the printing area, such as the metal aluminum foil wine label printing, the drying temperature is above 100 ℃, and the plastic film printing drying temperature is 60 ℃ -80 ℃ is suitable, the wind force should be stronger than when printing with solvent ink, because in addition to the temperature, there should be strong wind, so that the ink can be quickly dried on the printed matter.

3. Except metal aluminum foil, vacuum aluminized film and paper, all plastic films need to be treated with electric spark before printing with ink. The surface of the plastic is over 40 to 42. The ink produced with water as the main solvent is due to the water. The surface tension is around 72 dynes, so a large gap between the tension of the ink and 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, the ink is poured into the ink tank, and the plate is idling for 2-3 minutes. The purpose is to moisten the plate and stir it. During the printing process, in order to observe the print, it is necessary to stop printing. The printing plate stops rotating to prevent the printing plate dry strands from causing plugging.

5. After adjusting the printing viscosity according to the depth of the plate before printing, try not to add tap water during the printing process, just add new ink with the same viscosity, because the ink is in the printing process, at 32 ℃ temperature for 1 hour, who The volatilization is only 1.2%, and the viscosity change is small, so the ink keeps the color of the printed product consistent and improves the pass rate of the printed product.

6. After printing, immediately clean the printing plate, pour the ink into the bucket and cover it, put the clean water into the ink tank, rotate the printing plate for cleaning or adjust the 3% detergent solution for cleaning.

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