Three Key Elements To Improve The Quality Of Paper Bag Printing
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1. Viscosity: A few days before planning to start a printing task (especially before important and complex printing tasks), ink modulators need to fully understand the printing tasks to be undertaken (printing process, base color ink block, overprinting combination method, etc.) and the composition of anilox rollers and the printing speed to be set. Only in this way can the ink viscosity be adjusted according to printing needs.
2. pH value: In addition to paying attention to ink viscosity and all the above related information, ink modulators also need to determine the correct ink pH value to obtain the best printing effect. It is worth noting that the pH of water-based inks will gradually decrease, especially during the printing process or when exposed to air for a long time (without the ink cylinder lid). Therefore, when the ink is not in use, the lid of the ink cylinder should be closed tightly. Once the pH decreases, the ink viscosity increases. Only by adjusting the pH back to the standard state (8.2-9.0) can the viscosity of the ink return to its normal state. Changes in viscosity during the printing process will not only lead to changes in printing color, but also lead to other problems, such as dirty printing, outer edge band phenomenon, reduced color wear resistance, and so on. Therefore, automatic ink viscosity or pH adjustment devices designed for high-end users are useful for installation in the printing linkage unit.
3. Color: Everyone wants the color of the printed product to meet the regulations. In addition, there are some precautions: first, the same number of printing materials (paper) must be used when actual printing and proofing printing, Second, the same printing equipment must be used, the same printing speed, parameter settings, printing plates, anilox rollers and other parts and components must be used for actual printing and proofing printing. Third, the printed color and the standard printing color must be compared under the same lighting conditions.