What type of gravure ink is favored by printing companies

The products of some large ink manufacturers, especially gold, silver and white ink, will drop ink during printing and post-press processing. White ink is also prone to poor adhesion. Many packaging products are decorated with large color blocks As a result, discoloration directly affects the quality of packaging prints.

Requirements for ink blocking resistance Because of the high temperature and high humidity in the printing plant in the south, the blocking phenomenon of printed products often occurs. But the adhesion of printed matter is also related to the ink itself. Because the ink contains an oxidation accelerator, it is easy to cause adhesion of the printing ink layer. This makes the southern printing plants have more specific requirements on the anti-blocking properties of inks. Environmental protection requires many packaging and printing factories to adjust the viscosity of the ink with toluene in order to reduce costs. The consequence is not only that the residual solvent affects the safety of the printed matter, but also the main reason for the contamination of the gravure plastic flexible packaging solvent.

The emission of solvent-containing exhaust gas from the exhaust system of the gravure printing equipment has caused environmental pollution. Toxic gases such as toluene can also affect the health of workers. Therefore, the problem of pollution of plastic gravure solvent ink is a major problem in the gravure industry today. In recent years, the state has enacted some relevant environmental protection laws and regulations, and printing plants have paid more and more attention to the health of workers, which has increased the demand for various environmental protection inks in the printing industry. Such as high-concentration and low-viscosity inks suitable for shallow gravure printing, benzene-free alcohol-soluble inks and water-soluble plastic gravure printing inks are the development direction of plastic gravure printing inks.

Requirements for water-based inks Water-based gravure inks have the advantages of reducing atmospheric pollution, benefiting safe production, and reducing safety hazards. From the perspective of printing quality, due to the slow evaporation rate of water-based inks, the highlights are better inked. However, the currently used water ink still cannot reach the standard of solvent-based gravure ink in printing performance and printing quality. The main reason is that the surface tension of water is high, reaching 7.2x? 0-2N / m ', which makes the ink difficult to wet with the printing material, drying slowly, and the printing ink color is not bright enough. At present, water-based gravure ink has not been popularized in China. Therefore, technical improvements to inks and resins are needed to improve drying and film-forming properties.

At present, the basic requirements of ink users on the performance of ink: ink system with stable pH value. The ink must have a stable pH value during the printing process, and there is no need to detect or adjust the pH value during printing. In the ink, the resin tends to solidify due to the volatilization of the amine, and it may even solidify on the printing plate seriously. Therefore, improving the resolubility of the ink has become another requirement for packaging and printing plants. Requirements for alcohol-soluble plastic gravure inks Because water-based gravure inks cannot fully replace toluene inks, the cost is too high, so packaging and printing plants hope that ink factories will develop alcohol-soluble gravure inks as soon as possible.

Alcohol-soluble composite plastic gravure ink has the characteristics of low odor and no benzene. It can effectively reduce the health damage of toluene party ink and effectively solve the effect of residual solvents on the quality of packaged food. The use cost of alcohol-soluble ink is 20% higher than that of ordinary solvent-based ink. The biggest requirement for alcohol-soluble ink is to reduce the cost.

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