At the current "China Printing Industry Annual Report" , the problem of gravure VOCs must be solved, how to solve it? The answer is film gravure ink. Regarding the film gravure ink, Mr. Cai Chengji summed up some points that need attention. Fault analysis and elimination Dry performance gravure The drying of the gravure ink on the film is mainly based on volatilization, but since the volatilization rate of water is very slow, the drying performance of the gravure ink must be considered. Security printing Is it easy to get the knife? Prepress process The solvent can not be avoided gravure ink printing UV printing wire cutter, in addition to the foreign matter embedded in the blade caused by environmental factors, the main reason for the fluctuation of the mixed solvent solubility also in its use. The gravure ink does not use a mixed solvent. In theory, there is no risk of solubility fluctuation caused by the inconsistency of the mixing ratio and the volatilization ratio, but the objective reality is that the wire in the printing is still inevitable. Investment purchase Current status and trend of pH stability of ink The pH of the ink is generally between 8.5 and 9.5, and some inks may even reach or exceed 10.0. However, the pH value of the ink will change and purchase with the change of the ambient temperature. After the pH value fluctuates, the viscosity and transfer rate of the ink will change, which will bring color difference. Therefore, in the printing process, it is necessary to regularly monitor and adjust the pH of the ink, but this makes the frontline operators feel inconvenient. X-Rite Scratch resistance of the ink film embossing The printing ink has a specific history of the scratch resistance of the ink film, which is related to the hardness of the resin in the ink or the composition and proportion of the additive. The necessary scratch-resistant auxiliaries, which are found in the gravure solvent ink, should also be present in the gravure ink. enterprise
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