3, the ink viscosity requirements. The printing factory hopes that the viscosity of the original ink will be properly increased, and the viscosity of the ink will be controlled at 30-60 seconds (coating 4# cups). For high-speed gravure, the original ink has a viscosity of less than 40 seconds and a diluted viscosity of 12-15 seconds. For medium-speed printing, the original ink has a viscosity of 40-50 seconds and the diluted viscosity is 16-18 seconds.
4, the fineness of the ink requirements. Packaging printing is developing toward refinement, and printing equipment is becoming more and more sophisticated. The fineness of ink is required to be controlled below 15Î¼m. The ink is too thick not only to hurt the printing plate, but also it is easy to produce quality problems such as knife lines.
5, the requirements of water-based ink. Water-based gravure ink has the advantages of reducing atmospheric pollution, facilitating safe production, and reducing potential safety hazards. From the print quality point of view, due to the slower rate of evaporation of the aqueous ink, the highlights are better inked. However, the currently used water-based inks still do not meet the solvent-based gravure ink standards in terms of printing performance and print quality. The main reason is that the surface tension of water is relatively high, reaching 7.2*10-2N/m, which makes it difficult for the ink to wet with the printing material, and the drying is slow and the printing ink color is not bright enough. Therefore, the water-based gravure printing ink is still not popular in the country.
6, the alcohol soluble gravure ink requirements. Since water-based gravure inks cannot fully replace toluene-based inks and the cost is too high, packaging and printing companies hope that ink manufacturers will develop alcohol-soluble gravure inks as soon as possible. Alcohol-soluble gravure ink has low odor and benzene-free characteristics, which can effectively reduce the health damage of toluene-based ink and effectively solve the impact of residual solvents on packaging products, but the use cost is 20% higher than common solvent-based inks. Therefore, lowering the cost becomes the most important requirement for alcohol-soluble inks. At the same time, it requires non-stickiness, flexibility, grease resistance, abrasion resistance, and heat resistance. The selected pigment must have a certain light resistance.
Third, we hope that the environmental gravure ink will be available soon
The environmental protection requirements of food packaging on products are getting higher and higher. The same environmental protection also puts forward requirements on packaging and printing products such as cigarette labels. So far, gravure or toluene and other solvents to adjust the viscosity of the ink will cause a certain amount of environmental pollution. In order to meet environmental protection requirements, it is necessary to thoroughly change the performance of the ink and produce environmentally friendly gravure inks to meet the production needs of packaging and printing products.
Source: Jing Jia Group Zhang Jianping
Aluminium Foil Roll,Aluminium Foil Container,Aluminium Foil
Dadao Packaging Materials Co., Ltd. , http://www.hblaminatedfilm.com