The general trend of environmental protection has triggered a storm of water-based ink green packaging
the requirements of modern products for packaging are not only beautiful and applicable, but also increasingly require their healthy attributes, especially for health care products that can be closely related to human health through the application of key intelligent manufacturing technologies such as IOT, big data, cloud computing, etc. With the improvement of people's awareness of environmental protection, the urgent need for "green" printing materials is growing. Ink is an important part of packaging materials. Water-based ink, abbreviated as water-based ink, is made of water-soluble resin, organic pigments, surfactants and related additives through composite grinding. The environment-friendly ink market is developing rapidly.
at present, the main application fields of environment-friendly water-based ink are flexographic printing and gravure printing. Most of the products of these two printing methods are packaging products, of which food packaging, tobacco and alcohol packaging, children's toy packaging and so on account for a considerable proportion
in recent years, flexographic printing has developed rapidly all over the world and is considered as "the best and most promising printing method on earth" in developed countries in Europe and the United States. 95% of flexographic printing and 80% of gravure printing in the United States use ink. Flexographic printing is still in its infancy in China, and currently accounts for only about 3% of the printing field. In flexographic packaging and printing, water-based inks are mostly used at home and abroad. From 1995 to the end of 1998, China has introduced more than 130 combined flexographic printing production lines in just a few years, which are distributed in more than 20 provinces and cities across the country. There are nearly 200 narrow width flexographic printing production lines in China, and the annual demand for water-based ink is more than 100000 tons
in flexographic packaging and printing, water-based inks are mostly used at home and abroad. With the gradual popularity of green packaging and environmental protection packaging, many cigarette factories, distilleries, pharmaceutical factories, cosmetics, children's toy enterprises are preparing to adopt flexographic printing product packaging, and the proportion of flexographic printing in the printing field, especially in the field of packaging and printing, will gradually increase. It is estimated that flexographic printing will reach about 15% in the printing field by 2010, and the annual demand for water-based ink is more than 100000 tons
China's water-based ink was first developed and successfully put into production by Tianjin ink factory. On average, there are more than 1000 large and small carton factories in each province of China. If 10% of high-grade cartons are printed with water-based ink, each household needs about 1000 tons of water-based ink every year. It is urgent to vigorously develop, develop and produce high-grade water-based ink. This product can be widely used in the fields of flexo printing and gravure printing, such as gold, silver paperboard, coated paper, whiteboard, plastic film, corrugated paper, self-adhesive paper, carton, paper packaging, books and magazines, etc
advantages and disadvantages of water-based ink
1. The huge "green" advantage of water-based ink, because it does not contain volatile organic solvents, greatly reduces the emission of organic volatile substances
(VOC, the same below), thereby reducing air pollution, improving the environment of printing operators, and benefiting the health of employees. It can completely eliminate some toxic and harmful substances in solvent based inks, eliminate the harm to human body and the pollution of packaged goods, and improve the overall environmental quality. It is especially suitable for packaging and printing products with strict sanitary conditions, such as cigarettes, alcohol, food, beverages, drugs, children's toys, etc. In addition, it can not only reduce the fire risk and hidden danger caused by static electricity and flammable solvents, but also reduce the residual toxicity on the printing surface, and it is convenient to clean the printing equipment
2. Shortcomings of water-based inks
whether imported or domestic water-based inks, they are not resistant to alkali, ethanol and water, slow drying, poor gloss, easy to cause paper shrinkage and other disadvantages. To achieve alkali resistance, ethanol resistance, water resistance and improve gloss, only flexible UV ink can be used. This not only increases the printing cost, but also increases the printing process. For example, some automatic beer packaging production lines use alkaline lubricants with a pH value of, which water-based inks can't bear and will fade when touched. In addition, when selling beer in the south in summer, you should not only enter the refrigerator, but also soak it in ice water for a long time, and the water-based ink can't bear it
in addition, problems also include: it is difficult for water ink to wet and print well on polyethylene and other substrates; The drying time is still the most important problem in the application of ink. Unless the printing machine is equipped with sufficient drying equipment, the printing speed will be affected; The gloss of ink is lower than that of solvent based ink, Protect a fair and orderly market competition environment during the deadline "At present, ink is used in occasions with high gloss requirements.
How can ink products be more safe and healthy?
through nearly 10 years of technological improvement, ink system has successfully solved most of the original difficulties, changed the initial disadvantages into advantages, and gradually grew and matured. On the premise of environmental protection, safety and health, how can ink products meet the best adaptability of printing and post-processing and improve economic benefits is related Topics considered by enterprises
1. Improve the performance of ink
at present, the performance that ink users require to improve is: the pH parameter is subject to the manufacturer's technical scheme, and the ink system is stable. The ink manufacturing industry must develop ink with stable pH value in the printing process, that is, there is no need to detect and adjust pH value in the printing process; Re solubility is another important research field. During the evaporation of amine, the resin tends to solidify and even fix on the printing plate
recently, ink manufacturers have improved the performance of the resin to make it more soluble, which means that the printing system can run for a longer time before cleaning, that is, to improve production efficiency; The application of water ink requires continuous improvement in the application performance of polyethylene substrate. The ink manufacturing industry is expected to improve the surface resistance of ink prints, especially in oil and grease resistance, as well as better heat and freezing resistance. Recently, in Europe and North America, product innovation is mainly driven by meeting user requirements. The specific requirements for ease of use come from users, which will also be the driving force of new product development
2. keep up with the environmental protection situation
in order to achieve more stringent environmental management goals, printers are always looking for new methods of solvent ink printing operation process to meet the government's regulations. At present, the printing industry focuses on strengthening the treatment of emissions from solvent ink printing. The usual practice is to use an "incinerator" to absorb and incinerate VOCs. Other more creative is to apply the treatment system of microorganisms or bacteria that take VOCs as food. All these methods rely on efficient absorption and transmission of VOCs to systems that can neutralize it, either by incineration or by microorganisms
reprinted from: China seal