Food packaging Printing inks are directly related to food safety and people's health, so they are receiving more and more attention. Flexographic water-based inks are widely used in food packaging because of their non-toxic and environmentally friendly advantages. In this paper, the author discusses the advantages and printability of our company based on our experience in applying flexo-printed inks for many years.
Advantages of flexo-printed water-based inks
1. Reduce VOCs emissions, which is conducive to environmental protection
VOCs are recognized as one of the major sources of pollution in the world today. A large amount of low-concentration VOCs are emitted relative to the solvent-based ink, and the aqueous ink is used as a dissolving carrier. The substances released during the printing process are mainly water and a small amount of alcohol, and the VOCs are hardly emitted to the atmosphere. Solvent-based inks are unmatched.
The viscosity and pH of aqueous inks are the focus of the printing technician during the printing process. After years of testing and application, the current water-based ink can maintain the pH value at a constant parameter according to the requirements, reduce the pH adjustment during the printing process, and reduce the use of ammonia substances, thus enabling the use of water-based inks. Convenience is more advantageous.
2. Reduce the residual poison of the ink layer to ensure food hygiene and safety
At a time when human beings are paying more and more attention to food safety, it is quite difficult to achieve the hygiene and safety requirements of foods using solvent-based inks, but it is a breeze for prints using water-based inks. Water-based ink completely solves the toxicity problem of solvent-based inks and offset inks. It does not contain organic solvents, which greatly reduces the amount of toxic substances remaining on the surface of the printed matter. This feature makes food, beverages, medicines, children's toys and other packaging and printing materials with strict requirements for health and safety conditions have good health and safety.
For the water-based inks required for food packaging, the state also mandates that the main and auxiliary materials in the water-based inks need to meet the requirements in GB9685-2016 "Sanitary Standards for the Use of Additives for Food Containers and Packaging Materials ". At the same time, the printed matter also needs to have a lot of resistance to resistance, such as alcohol resistance, n-hexane resistance, isooctane resistance and the like.
3. Reduce energy consumption and reduce production costs
In the process of paper packaging and printing, there are three main types of drying of water-based inks: when printing coated paper, volatile drying is the main; when printing non-coated paper, it is mainly by osmosis drying; when printing light coated paper, It takes the form of both volatilization and permeation drying. Therefore, compared with the solvent-based ink, the UVA light-curable printing ink layer which needs to be highly evaporated and the UV ink needs high energy consumption, the drying process of the aqueous ink can adjust the energy of the drying end according to the characteristics of the surface of the material and the printing speed, even in printing. When non-coated paper is used, the ink which is mainly osmosis-drying can realize high-speed printing without using the hot air system, and reduce power consumption during printing.
In addition, when cleaning the water-based ink, the plate and the color group can be cleaned only by using water or a small amount of alkaline solution, and the waste liquid generated during the cleaning process can also be filtered by using a wastewater treatment device, and the filtered water can be repeated. The use reduces the industrial water consumption of the printing enterprise and greatly saves the production materials. The use of offset inks, solvent-based inks, and UV inks, in addition to generating a large amount of waste liquid during cleaning and maintenance, inevitably generates a large amount of solid waste.
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