What type of gravure ink is favored by printing companies
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Some large ink manufacturers' products, especially gold, silver ink and white ink, will appear in the printing and finishing process, the white ink is also prone to poor adhesion, many of the packaging products are decorated with large color blocks. Therefore, the color drop directly affects the quality of the printed matter.
The anti-adhesion requirement of the ink is located in the printing factory in the south. Due to the high temperature and humidity of the workshop, the printing of the printed matter often occurs. But the adhesion of the print is also related to the ink itself. Since the ink contains an oxidation promoter, it tends to cause adhesion of the printing ink layer. This has made southern printing houses have more specific requirements for the anti-blocking properties of inks. Environmental protection requirements In order to reduce the cost, many packaging and printing factories use toluene to adjust the viscosity of the ink. The consequences not only make the residual solvent affect the safety of the printed matter, but also cause the solvent pollution of the gravure plastic flexible packaging.
The discharge of solvent-containing exhaust gas from the exhaust system of gravure printing equipment causes environmental pollution. Toxic gases such as toluene also affect the health of workers. Therefore, the problem of contamination of plastic gravure solvent ink is a difficult problem in the gravure printing industry today. In recent years, the state has enacted some relevant environmental regulations, and the printing factory pays more and more attention to the health of workers, which has increased the demand for various environmentally friendly inks in the printing industry. For high-concentration and low-viscosity inks suitable for shallow gravure printing, benzene-free alcohol-soluble inks and water-soluble plastic gravure inks are the development direction of plastic gravure inks.
Requirements for water-based inks Water-based gravure inks have the advantages of reducing air pollution, facilitating safe production, and reducing safety hazards. From the perspective of printing quality, the high-light part is better inked because of the slower evaporation rate of the water-based ink. However, the ink currently used still does not meet the standards of solvent-based gravure inks in terms of printing performance and printing quality. The main reason is that the surface tension of water is high, up to 7.2 x?0-2N/m', which makes the ink difficult to wet with the printing material, the drying is slow, the printing ink color is not bright enough, and now the water-based gravure ink is still not popular in China. Therefore, technical improvements in inks and resins are required to improve drying and film formation.
At present, the basic requirements of ink users for ink performance: the ink system with stable pH. Ink must have a stable pH during the printing process and no need to detect or adjust the pH during printing. In the ink, the resin tends to be solid due to the volatilization of the amine, and the curing may even occur on the printing plate. Therefore, improving the resolubility of the ink becomes another requirement of the packaging and printing factory. Requirements for alcohol-soluble plastic gravure inks Because water-based gravure inks are not able to completely replace toluene-based inks, the cost is too high, so packaging printers hope that ink factories will develop alcohol-soluble gravure inks as soon as possible.
The alcohol-soluble composite plastic gravure ink has the characteristics of low odor and no benzene, and can effectively reduce the health damage of the toluene party from the ink and effectively solve the influence of residual solvent on the quality of the packaged food. The cost of using alcohol-soluble inks is 20% higher than that of common solvent-based inks. The biggest requirement for alcohol-soluble inks is to reduce costs.