Screen printing is a printing method capable of printing on all materials and substrates with different shapes except air and water, and the printing ink layer thickness can reach 60 micrometers, which is 4 times the thickness of the gravure ink layer. Ink printing has always played an important role in screen printing. It not only determines the quality of screen printing products, but also affects the screen printing speed. However, there are many kinds of screen printing inks, and the ink system is very complicated, and there is a common problem that the ink is cured and dried. Ultraviolet light radiation curing inks and electron beam curing inks have become two types of inks with great market development potential in screen printing inks.
China's screen printing industry started late. The development and application of modern screen printing technology began in the early 1980s. After entering the 1990s, with the growth of the industrial economy, the screen printing industry has developed accordingly. According to the survey, the annual average consumption of ink by the screen printing factory is approximately 782 kg. The total annual consumption of screen printing ink in the country is more than 20,000 tons (including fabric printing paste), of which about 55% are imported screen printing inks. This is because: First, domestic inks have few varieties, and their output is low, and they cannot meet user requirements; Second, the quality of some high-end domestic inks is still not stable. My domestic development of screen printing ink manufacturing industry can be said to be from scratch, from small to large. Currently, there are more than 50 manufacturers producing screen printing inks in the Mainland, producing more than 130 kinds of products (including special screen printing inks such as silk printing pastes, luminous, fluorescent, reflective, etc.). The annual output of screen printing inks is more than 8,000 tons, and the output value is 240 million. Yuan around. With the expansion of the application of screen printing technology in the industrial sector, the production of screen printing inks in China has also achieved certain development. Currently, there are both solvent-based inks suitable for various substrates, and newly developed screen-printed water-based inks and ultraviolet light. Cured ink.
At present, the world's screen printing inks are moving in the direction of quick-drying, non-toxic and non-polluting. Of course, the development of screen printing inks depends on the expansion of screen printing applications. Now the application of screen printing technology has expanded into the printing field of packaging and decoration industry, advertising industry and building materials industry. This requires screen printing inks must adapt to the development of screen printing to large-scale, multi-color and combined printing. For example, screen printing can be combined with offset printing, gravure printing, or flexographic printing to form a filament printing machine (ie offset-screen printing combination printing machine) or a flexible printing machine (ie flexo printing-silk-screen printing combination printing machine) due to adhesive silk screen or soft silk printing. Machine production, it requires screen printing ink has a certain drying speed. In addition, the combined printing method is currently used for package printing, so there are three kinds of â€œgreenâ€ inks that require non-toxic, odorless, and non-polluting inks to meet the requirements for screen printing development. One is screen printing water-based inks. The other two are UV curable inks and electron beam radiation curable inks.
First, screen printing water-based ink
Screen printing water-based ink, also known as screen printing water-based ink, English name is water base screen printing ink. As its name suggests, water-based inks are water-based ink systems. Compared with solvent-based inks, it is solvent-free, non-toxic, odorless, non-polluting, and environmentally friendly. At present, solvent-based printing inks contain 50% to 60% of volatile components. If the diluent required for formulating ink viscosity is also taken into account, the volatile components emitted by the ink will be released when the printed product is dried. The total content is 70% to 80%. The volatilization of these organic solvents will have an adverse effect on the environment, and it will also have a detrimental effect on human health. There is no doubt that screen-printed water-based inks will be greatly developed and continuously promoted.
Source: China Ink Technology Network
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