3, high gloss
Increasing the gloss of inks and finishes is exactly what printers are looking for. The new manufacturing method of waterborne acrylic resin can increase the gloss by 20-30 while maintaining the following properties: drying speed, transparency, color density, dirty plate, heat resistance, (dry, wet and ice water) resistance to rubbing, resistance to (scratch, water, grease, acid) properties. The abrasion resistance is slightly reduced but still acceptable.
4, good liquidity
The newly developed water-based letterpress ink in Changzhou Nanyang Ink Chemical Factory is made of two new types of synthetic resins and advanced organic pigments, dyes, solvents, and additives. The product has good fluidity, stability and printing adaptability, printing and drying performance is good, printed Parts are clear and full, with water resistance characteristics, the product can use water to adjust viscosity and reduce production costs. The ink is suitable for the printing of printed foods and pharmaceutical packaging papers. It can also be used for the printing of corrugated paper, corrugated boxes, composite woven bags, cement bags and other types of paper.
Fourth, food packaging favor ink flexo
Water-based inks are particularly suitable for cigarettes, wines, foods, beverages, medicines, children's toys and other sanitary packaging products. Since the water-based ink does not contain volatile organic solvents, it can not only reduce the residual toxicity of the print surface, make the printing equipment easy to clean, but also reduce the risk of fire and hidden danger caused by static electricity and flammable solvents, so water-based ink is called new The "green" printed material.
Packaging for the environment and human body pollution, mainly packaging materials and packaging printing two major aspects. Direct contact with food packaging materials, such as paper, plastics, metals, etc. can not have any sources of pollution, this is the premise; but some materials are inevitable, we must rely on packaging and printing, increase the protective layer on the substrate, so that food is not in direct contact Materials with residual sources of contamination, such as a layer of coating in metal cans, printing or composite layers in plastic films, provide good barriers.
However, this is not the safest packaging printing, because traditional printing inks inevitably incorporate solvents such as benzene and other harmful substances. Although most of them are volatilized during the printing process, there is always a small amount of residual substances. Continue to distribute during packaging and use.
The best solution to the problem that has been found is flexographic printing. The printing ink carrier is alcohol or water and it is completely non-toxic and volatile. From a food hygiene point of view, flexographic printing is the most suitable packaging and printing process; it is also the natural choice for pharmaceutical packaging. In some developed countries, regulations have even been established that must use flexographic printing to produce pharmaceutical packaging.
One of the greatest advantages of flexographic printing is the continuity of subsequent processing. General flexographic printing is web rotation printing, and the processes of die cutting, gluing, and bag making can be continuously completed online, especially for the production of automated packaging machines for food production companies. Of course, gravure printing also has such a function, but the flexographic version is relatively low cost, and it is easier to produce more varieties and small batches.
V. The future development trend of ink painting
1, environmental protection
The most important application field of environment-friendly water-based inks is packaged products, of which food packaging, tobacco and wine packaging, and children's toy packaging occupy a considerable proportion. With the improvement of people’s awareness of environmental protection, the urgent need for “environmentally friendly†printed materials is increasing.
Whether or not ink painting can enter another climax in the future market, the ink and wash manufacturing industry regards government initiatives as the ultimate driving force. The environmental protection part has always required the final zero emission of VOCS (volatile organic compounds), which means that for printers to gradually reduce the amount of VOCS released will eventually promote the application of ink. At this stage, there are pressures from various sources that environmental issues will be further noticed. In order to achieve increasingly stringent environmental management goals, printers are always looking for new ways of solvent ink printing operations to meet government regulations. The current focus of the printing industry is on enhancing the handling of emissions from solvent ink printing. The usual practice is to use "incinerators" to absorb and incinerate VOCS. Others are more creative in the application of micro-organisms or bacteria processing systems that feed on VOCS. . All of these methods rely on the efficient absorption of VOCS for transport to systems that can be neutralized or incinerated or absorbed by microorganisms. Although the environmental protection department still does not have a thorough and detailed development plan, it only continues to strengthen guidance and management. However, we believe that the strong guidance of environmental protection will have a significant impact on the final transition to ink and wash.
2, gentrification
People concerned believe that with the continuous development of the society and the improvement of standard consumption levels, the printing of corrugated boxes must gradually develop in the direction of high quality, high quality, multi-color, and strong visual effects. In the direction of multi-color printing of colored noodles, it is also based on commodity packaging instead of transport packaging. The use of whiteboard cattle card to replace the box board cattle card, to achieve bright colors, good gloss, beautiful and so on. To achieve the above standards, high demands are made on plate making and printing inks. In high-grade carton printing plates, flexible plates must be used instead of rubber plates, and high-quality aqueous inks must also be used to achieve luster, bright, fast drying and high-speed production.
3, easy to use
The progress of ink-ink technology is gradually accepted by the flexographic printing market. This is mainly due to the fact that ink ink has been surpassing solvent-ink systems for many years and has advantages in ease of use and simple printing. Recently in Europe and North America, product innovation has been driven primarily by meeting user requirements. The specific requirements for ease of use come from users, which will also be the driving force for new product development. The current performance requirements of ink users are: PH stable ink system, the ink manufacturing industry must develop a stable PH value in the printing process, that is, in the printing without having to detect and adjust the PH value; re-solubility is another important In the research field, the resin tends to cure during the volatilization of amines, even on the printing plate. Recently, ink manufacturers have improved the performance of the resin to make it easier to dissolve, which means that the printing system can be operated for a longer time before cleaning, ie, the throughput is increased; the ink application requires continuous improvement in the application of the polyethylene substrate. Performance; Alkali resistance of ink printing packaging, and application in frozen food packaging. The ink-and-wash manufacturing industry is expected to increase the surface resistance of ink-and-ink printing products to make more products water-based, especially in terms of oil resistance, grease resistance, and better heat and freezing resistance.
(Author's introduction: Bai Mu (1966—), male, Changsha, Hunan, master's degree. Has long been engaged in military chemical research. Has published more than 40 papers, was selected more than 10 kinds of works.)