New universal printing technology after the most p

Ink jet printing is another "universal" printing technology after silk printing. It has developed rapidly with the continuous development of computer control technology and packaging technology. It has been applied in many modern factories and packaging automatic lines. 7. When the piston exceeds the stroke (about 20mm). Ink jet printing has incomparable advantages over other printing methods, such as wide adaptability, high-speed intelligence, low cost, no pollution and so on. The operator can easily and quickly print the date, specification, shelf life, quantity, bar code, etc. on the on-site (in motion) packaging. After inkjet printing, the product dries quickly and can immediately enter the next process. Unlike traditional packaging printing, inkjet printing no longer requires plate making and special pre press auxiliary processes

the advanced inkjet printing system can effectively reduce the impact of the hydraulic system; When the operator presses the keyboard during operation, he can change the fonts, symbols and various graphics and texts that need to be printed. It can not only be used to print words and numbers, but also realize the spray printing function of selecting and expanding bar codes and user (customer) anti-counterfeiting marks. Inkjet printing system has gone far beyond the scope of traditional printing. In addition to the printing functions of black-and-white and color, it also has the functions of data processing and information storage. By selecting (installing) memory memory, it can store hundreds of independent codes (numbers, character sets, etc.) and nearly 10000 characters. It is connected with the computer to realize the sorting and printing of work records and reports. When it is connected in series with the host, it can also print the weight on the package (or other substrate), record various data transmitted by satellite communication, draw atmospheric cloud maps, etc. Ink jet printing has been widely used in packaging surface printing of various shapes and materials on site, whether with or without holes, flat or curved surface, fabric or rib shaped surface, such as plastic, cloth, paper, fur, ceramics, glass or metal. At the same time, it is suitable for printing at all speeds, whether constant speed, variable speed or intermittent operation, and is most suitable for continuous and non-stop operation on the packaging production line. Inkjet printing numbers, dates, etc. on a continuous production line is more economical and faster than other printing or pasting labels. The principle of ink-jet printing is basically the same whether it is used in the field of packaging or in the field of office. Now take the office inkjet printer as an example to introduce the principle of inkjet printing

there are mainly two types of inkjet printers on the market: piezoelectric (such as Epson products) and bubble (such as HP and Canon products). One end of the ink bin of the piezoelectric inkjet printer is a nozzle, and the other end is a piezoelectric material (mostly lead aluminum titanium piezoelectric crystal). The ink is pressed out of the nozzle at high speed under the deformation of the piezoelectric crystal. After the ink drops are ejected, the ink is replenished by the ink cartridge in time. The bubble inkjet printer is equipped with a thermal resistor near the nozzle, and the current pulse applied by the digital signal instantly generates heat (the heating speed can reach 100 ° c/s, and the temperature can reach 280 ° C), which quickly heats the ink locally, making a small amount of ink boil around to form a bubble. Under the high pressure of bubbles, ink droplets are ejected from the nozzle, and bubbles disappear and take away heat. The ink is quickly replenished by capillary action from the storage room. The development of inkjet ink the principle of inkjet printing determines that inkjet ink should have some special properties. First of all, ink should have certain physical and chemical properties such as viscosity, surface tension and pH value. Generally, the surface tension of ink is (3.0 ~ 5.0) × N/m, viscosity of 1 ~ 3.0MPa · s and pH value of 8 ~ 9 are suitable. Secondly, the ink should also have long-term storage stability, good continuous and intermittent printing performance, good color, brightness, purity and color saturation, as well as water resistance, light resistance and weathering resistance. Moreover, the components of the ink cannot react with the nozzle, so as not to cause nozzle blockage; The ink should be clear and dry fast, but it should not volatilize too fast during spraying or when not in use; The images and words printed with ink shall be neat and free from diffusion, ink shortage and inequality

in order to meet the above performance requirements for inkjet ink, inkjet ink is usually composed of the following components: solvent, colorant, watch, especially when unloading, do not loosen hand activator, humectant, pH regulator, drier, metal ion chelator, preservative and other additives

1970 is pregnant with a business opportunity with infinite profits. According to different ink-jet technology principles, various ink-jet printers have been developed successively and began to be put into the market as commodities. Ink-jet printers have become a new type of high-speed, low-noise output equipment that is eye-catching in the non impact type, and have developed very rapidly

therefore, inkjet inks have also been further developed, especially for liquid color inkjet printers. As early as 1974, a German company introduced a kind of color ink. Since then, major companies have accelerated the research on ink, such as IBM in the United States and Fuji in Japan. Especially in 1982, after the bubble inkjet printer of Canon company in Japan came out, the research and development of ink developed more rapidly. Canon first introduced an ink suitable for bubble inkjet printers. This ink has good storage stability and good intermittent and continuous printing performance. At the same time, major companies also began to improve the formula of ink. For example, Epson company has developed an ink, which can dissolve the filler medium added to the paper surface when it comes into contact with the paper. As soon as the pulp is exposed, the ink droplets are immediately absorbed, so the drying speed is fast, and each ink dot can maintain a high degree of roundness. Problems faced by domestic inkjet printing inkjet printers have been accepted by more and more users for their excellent cost performance. However, in China, the further development of inkjet printing technology is still affected by some factors. According to relevant information and the author's investigation of the domestic market, so far, China has not really developed inkjet inks with relatively stable performance. Therefore, at present, almost all inkjet inks in the domestic market, especially color inkjet inks, rely on imports. The prices of these imported inkjet inks are quite high, which seriously hinders the development of China's inkjet printing industry and its related industries. Therefore, improving the performance of ink, especially developing ink with good color, safety and stable performance, has become the most urgent problem to be solved in China

reprinted from: printing technology Author: luoguanglin