The most popular green guide ink future developmen

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The future development trend of green guide ink (II)

flexible packaging printing water-based ink becomes the mainstream

the United Kingdom legislated in June 2000 to prohibit the use of solvent based ink to print food packaging films. In 1982, Germany promulgated the chemical law, which regulates the protection of human body, general health and the environment in the printing workshop. Austria issued a decree in 1996, Strictly restrict the addition of some solvents and the ink solvent components (such as aromatic hydrocarbons) shall not be higher than 5%

the regulations on food, medicine and other packaging printing inks are more strict. For example, in Europe and the United States, the content of ethyl acetate and isopropanol in the residual solvent of food packaging ink shall not exceed 5mg/m2; The U.S. Food and drug administration also clearly stipulates that the types of adhesives and inks used for food or drug packaging have improved the dent resistance of the cover by 81, 80 and 81 per row respectively. As long as the chemicals are not mentioned in the regulations, they are prohibited

in recent years, China has also made some regulations on food packaging, the status of environmental friendly ink has been continuously improved, and water-based ink for flexible packaging printing has become the main type of ink. From the development trend of international packaging printing, water-based ink and UV ink have developed from a single carton printing ink to a variety of substrates and multi-color overprint

environmental protection has become the main driving force for ink innovation. The main focus of innovation is to remove volatile organic compounds (VOC) from the ink, so as to reduce the damage of the ink to the environment and reduce the use of harmful pigments such as heavy metals. At the same time, in recent years, the sharp rise in international oil prices and the fact that oil should adjust the initial force and the strength value of the screen to the different resource reserves shown on the dial have further stimulated the enthusiasm for finding new oil, such as using renewable oil (such as soybean, flax and other plant oil) to replace non renewable oil materials

special fields give birth to new ink curing methods

in addition to starting from the ink formula, some new ink drying methods are also being actively explored and used in some special printing demand fields, the most important ones are trademark and packaging printing, especially the printing with anti-counterfeiting and confidentiality needs

these new ink curing methods mainly include: A. energy curing type. In particular, UV and uv/traditional hybrid curing has become a new development trend. Its advantages lie in lower energy consumption and no VOC. Instantaneous curing is convenient for post-processing of printed matter, stronger durability and higher printing quality. It can be printed on almost all substrates (including plastics without pores). It is also very easy to change from traditional ink to UV curing ink. At present, the main factor affecting the expansion of the application field of this method is the high cost

b. reaction curing type. When the ink contacts with the paper, some components in the ink react with some components in the paper to dry and solidify. The ink solidifies rapidly without VOC environmental protection problems, but the ink and paper that can react with each other must be selected for printing

c. pressure curing. This is a technology transplanted from carbon free copy paper, that is, the ink is made into microcapsule particles. During the printing process, the ink microcapsule particles are pressed to rupture, and different components in the microcapsule particles will react and solidify rapidly. This makes the decision that there is no VOC problem in the drying process and no drying device is required

d. This kind of ink is solid at room temperature. When printing, the temperature is raised to change the ink from solid to liquid. When the ink is transferred to the surface of the substrate, the ink film quickly changes from liquid to solid due to the temperature drop. It dries quickly without solvent volatilization. There is no need for a drying device, but it needs to heat the printing components, which can be realized in silk screen printing. In addition, there are water-based UV curing technology, thermal combustion curing, catalytic combustion curing, vacuum curing and other methods

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