Static electricity is a factor that troubles printing. This kind of static electricity is the static electricity generated on the surface of the paper or film by the friction between the paper or film material and the ionization of the roller or air during the printing process, which has a little impact on the printing quality. It is produced by special equipment and plays an auxiliary processing role in printing and post-printing processes. The application of static electricity in the printing industry: Gravure printing is the process of transferring a small amount of ink in the gravure roll mesh to the surface of the substrate. Due to the surface tension of the gravure ink, the capillary effect of the paper, the same cell wall, the roughness of the paper surface and other factors, it is difficult to transfer the ink and it is easy to form white spots. In order to solve such problems, the German ELTEX company developed an electrostatic ink absorption system. Its structure is: a high voltage generator, an electrostatic discharge bar, and two static elimination bars. The principle is electrophoresis. The voltage is -27KV through the electrostatic discharge bar. The unidirectional direct current is charged by air ionization on the surface of the platen roller. An electrostatic action area is formed between the platen roller and the plate roller, and the ink is pulled to change its surface shape, so that a part of it is higher than the surface of the plate roller, and it is easy to contact with the substrate. When this contact occurs, the ink can be transferred. Improve the transfer rate of ink to avoid the phenomenon of dot loss, thereby improving the printing quality of the product. The electrostatic ink absorption system can be applied to decorative material gravure printing, book gravure printing and tobacco packaging gravure printing. There are solvents in the printing process, and the electrostatic ink absorption system uses high voltage to easily generate sparks, which may cause fire hazards, but ELTEX The electrostatic ink absorption system adopts a reasonable structure, which reduces the current to μA and the short-circuit current is 33μA. There is no electric spark during use, which can ensure the safety of use. With China's accession to the WTO, commercial printing will not only increase in quantity, but also require higher and higher printing quality. As a commercial rotary printing enterprise, it is necessary to improve the quality of its own printed products, reduce production costs, and increase production efficiency. From the perspective of existing paper and ink in China, the use of thermosetting inks can not only improve printing efficiency, but also reduce costs. Due to equipment configuration problems, there are serious problems of water dispersion loss during printing, easy paper breakage, serious paper wool, and breakage due to folding, as well as low cooling efficiency. As a result, the equipment cannot be produced at normal speed and production efficiency is reduced. The German ETEX company has developed an electrostatic humidification system and electrostatic compound and a gap eliminator to improve cooling efficiency. In commercial rotary printing, the general moisture content of the web is 5% to 4%. After offset printing, the paper absorbs ink and the moisture absorption reaches 6.5%. The use of thermosetting ink requires high temperature drying, and the temperature is generally 100 ℃ ～ 120 ℃, the paper moisture has dropped to less than 1% at this time, the paper fibers lose more water, loose fibers will cause paper fluff, paper dust, and the paper is easy to be broken. During the folding process, the paper edge breaks. Due to the unevenness of the paper's ink absorption and moisture regain, there will be depressions or wrinkles or long and short pages in the binding belt. In order to avoid this phenomenon, domestic commercial rotary printing machine manufacturers will reduce the machine speed but the production cost will increase. Foreign commercial rotary printing presses are generally equipped with electrostatic devices for electrostatic humidification and cylinder gap to improve cooling efficiency. Japan's ToPPan PrinTing ComPanY's Komori commercial rotary printing press is equipped with ElTEX's LG50 electrostatic humidification system, and the United States' RRDonnEllY PrinTing ComPang, and its Heidelberg M600 commercial rotary printing press is equipped with the German ELTEX WE.B.rEmoisTEn electrostatic humidification system. Its structure is: pressure generator, electrostatic discharge bar, water mist spray device, electrostatic humidification system use process; high voltage electricity is generated by the voltage generator, and then the electrostatic discharge bar (the electrostatic discharge bar is placed on the roller, and the ground Connected to form an electric field) There is a high voltage of 3kV, which causes the surface of the paper to be charged through the water mist spray device. Due to the effect of the electrostatic field, the water mist will spread uniformly on the paper along the direction of the electrostatic field, causing the paper moisture to rise to 3% ~ 4 %, You can avoid the problem of water loss caused by this system. At the same time, an electrostatic application device is used on the first cooling roller, because the paper is output from the high-temperature drying equipment, the surface temperature is high, and the cooling roller is in contact, and the air between the high-temperature paper and the cooling roller is caused by heat. The air rises and lifts the paper, so that the paper cannot make good contact with the cooling roller (the angle between the paper and the cooling roller is reduced), and the static electricity application device uses static electricity on the surface of the paper. Because the cooling roller is grounded through the bracket, the The paper with static electricity is in better contact with the cooling roller, which increases the angle between the paper and the cooling roller, and improves the cooling efficiency of the first cooling roller, which can increase the speed of the printing press and reduce the number of cooling rollers. To reduce printing costs. There are two folding methods on commercial rotary printing presses. One is to fold the paper into a booklet through the former, and the other is to divide the paper first, then clutch it, and then fold it into a booklet. In the former method, the thickness of the inner crease of its folded edge is significantly thicker than that of the second method, because the minimum rounded corner of the former is determined. There is a minimum rounded arc at the first fold. The rounded arc length of the outer fold line of the second fold is longer than the rounded corner of the inner fold line of the second fold. On the one hand, there is waste of paper, and on the other hand, it is not conducive to folding. The second method is to divide first, there is no problem of folding edge wrap angle, so it is easy to fold and can save printing materials (paper is the highest cost factor in web printing operations) The equipment required for the second method must be Electrostatic clutch device. On both sides of several paper tapes, there are two electrostatic discharge sticks, which make the paper static electricity. Due to the effect of static electricity, the paper is firmly "glued" together. It can prevent the paper from sliding, so as to facilitate the correct folding and cutting of the subsequent process.
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