The application of static electricity in printing (1)

Static electricity is a factor that plagued printing. This static electricity is the static electricity generated by the paper or film surface during the printing process of the paper or film material, friction with the roller or ionization of the air on the surface of the paper or film. It has a slight impact on the printing quality, and the static electricity involved in this article. It is produced by specialized equipment and plays an auxiliary processing role in printing and post-printing processes.
The application of static electricity in the printing industry:
Gravure is the process of transferring traces of ink from gravure roll pockets to the surface of the substrate. Due to the surface tension of the gravure printing ink, the capillary effect of the paper, and the factors such as the cell wall and the rough surface of the paper, it is difficult to transfer the ink and easily form white spots. In order to solve such problems, the German ELTEX company developed an electrostatic ink-absorption system. The structure is: a high voltage generator, an electrostatic discharge rod, two static elimination rods, the principle of which is the principle of electrophoresis, the voltage is applied through the electrostatic discharge rod -27KV, one-way direct current through the air ionization makes the surface of the embossing cylinder charged, An electrostatic action zone is formed between the embossing roller and the plate roller, and the ink is pulled to change the surface morphology, so that part of the surface of the roller is higher than the surface of the printing roller, and it is easy to come into contact with the substrate. This contact occurs and the ink can be transferred. Improve the transfer rate of ink and avoid the loss of dots, thus improving the printing quality of the product. Electrostatic ink-absorption systems can be used for gravure printing of decorative materials, gravure printing for books and magazines, and gravure printing for tobacco packaging. In this printing process, solvents are present. Electrostatic ink-absorbing systems use high voltage to generate sparks, which may cause fire hazards, but ELTEX's The electrostatic ink-absorbing system adopts a reasonable structure, which can reduce the current to μA and the short-circuit current of 33μA. During the use, there is no spark, which can ensure the safety of use.
With China's accession to the WTO, commercial printing will not only increase in quantity, but will also have higher and higher requirements for printing quality. As a commercial rotary printing company, it is necessary to improve the quality of its own printing products, reduce production costs, and increase production efficiency.
From the perspective of China's existing paper and ink, the use of thermosetting inks not only improves printing efficiency, but also reduces costs. Due to equipment configuration problems, there are problems such as severe water dispersion, easy paper breakage, severe paper and folding, and low cooling efficiency in the printing process, which results in the equipment being unable to produce at normal speed and reducing the production efficiency. ETEX Corporation of Germany has developed a static air humidification system and electrostatic compounding as well as a gap eliminator for improving the cooling efficiency. (To be continued)