In commercial rotary printing, the moisture content of the web is generally 5% to 4%. After offset printing, the paper absorbs ink and the moisture absorption reaches 6.5%, while the use of thermoset ink requires high temperature drying, and the temperature is generally 100. °C ~ 120 °C, at this time the paper moisture has dropped to less than 1%, paper fibers lose more moisture, loose fibers will appear paper lint, paper dust more, and the paper is easily broken. Edge breaks occur during hemming. Due to the uneven moisture absorption of the paper, a depression or a booklet may be formed at the binding band, resulting in wrinkles or short and long pages. In order to avoid this phenomenon, domestic commercial rotary press manufacturers will reduce the machine speed but increase the production cost.
Foreign commercial rotary printing presses are generally equipped with electrostatic devices that electrostatically humidify and increase the cooling efficiency of the roller gap. Japan's ToPPan Printing ComPanY's Komori commercial rotary printing press is equipped with ELTEX's LG50 electrostatic humidification system and US RRDonneLLY Printing ComPang. The Heidelberg M600 commercial rotary printing press is equipped with ELTEX's WE.B.remoiSten electrostatic humidification system.
The structure is: pressure generator, electrostatic discharge stick, water mist spray device, electrostatic humidification system use process; high voltage electricity generated by the voltage generator, and then electrostatic discharge stick (electrostatic discharge stick placed on the roller, with the ground Associated with the formation of an electric field) There is a high voltage of 3kV, which causes the surface of the paper to be charged past the mist jet device. Due to the electrostatic field, the mist will spread evenly along the electrostatic field to the paper, causing the moisture of the paper to rise to 3%~4. %, the problem of water loss without this system can be avoided. At the same time, the electrostatic application device is used on the first cooling roller. Since the paper is output from the high-temperature drying device, the surface temperature is high, and it comes into contact with the cooling roller, and the air between the high-temperature paper and the cooling roller is heated. As the air rises, the paper is lifted so that the paper cannot contact the cooling roller well (the angle of 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 paper with static electricity contacts the cooling roller better, so that the wrap angle of the paper and the cooling roller is increased, so that the cooling efficiency of the first cooling roller is improved, which can increase the speed of the printing machine and reduce the number of cooling rollers. , Reduce the cost of printing.
There are two kinds of folding methods on the commercial rotary printing press. One is to fold the paper into a book by a forming machine, and the other is to use a first dividing and re-clutching and then folding into a book. In the former method, the thickness of the inner crease of the folded edge is significantly thicker than that of the second type, because the smallest rounded corner of the former is determined, and there is a minimum roundedness at the first fold, and when the second fold, the first The rounded arc length of the two fold outer fold line is longer than the rounded arc length at the second fold inner fold line. 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 eliminate the problem of fold angle at the edge of the fold first, so it is easy to fold and can save printing materials (paper is the highest cost factor in web printing). Electrostatic clutch device. There are two electrostatic discharge sticks on the two sides of several paper strips, so that the paper is charged with static electricity, due to the role of static electricity, the paper is firmly "glued" together. It can prevent the paper from sliding so that it can be folded correctly in the subsequent process. (Finish)
Foreign commercial rotary printing presses are generally equipped with electrostatic devices that electrostatically humidify and increase the cooling efficiency of the roller gap. Japan's ToPPan Printing ComPanY's Komori commercial rotary printing press is equipped with ELTEX's LG50 electrostatic humidification system and US RRDonneLLY Printing ComPang. The Heidelberg M600 commercial rotary printing press is equipped with ELTEX's WE.B.remoiSten electrostatic humidification system.
The structure is: pressure generator, electrostatic discharge stick, water mist spray device, electrostatic humidification system use process; high voltage electricity generated by the voltage generator, and then electrostatic discharge stick (electrostatic discharge stick placed on the roller, with the ground Associated with the formation of an electric field) There is a high voltage of 3kV, which causes the surface of the paper to be charged past the mist jet device. Due to the electrostatic field, the mist will spread evenly along the electrostatic field to the paper, causing the moisture of the paper to rise to 3%~4. %, the problem of water loss without this system can be avoided. At the same time, the electrostatic application device is used on the first cooling roller. Since the paper is output from the high-temperature drying device, the surface temperature is high, and it comes into contact with the cooling roller, and the air between the high-temperature paper and the cooling roller is heated. As the air rises, the paper is lifted so that the paper cannot contact the cooling roller well (the angle of 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 paper with static electricity contacts the cooling roller better, so that the wrap angle of the paper and the cooling roller is increased, so that the cooling efficiency of the first cooling roller is improved, which can increase the speed of the printing machine and reduce the number of cooling rollers. , Reduce the cost of printing.
There are two kinds of folding methods on the commercial rotary printing press. One is to fold the paper into a book by a forming machine, and the other is to use a first dividing and re-clutching and then folding into a book. In the former method, the thickness of the inner crease of the folded edge is significantly thicker than that of the second type, because the smallest rounded corner of the former is determined, and there is a minimum roundedness at the first fold, and when the second fold, the first The rounded arc length of the two fold outer fold line is longer than the rounded arc length at the second fold inner fold line. 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 eliminate the problem of fold angle at the edge of the fold first, so it is easy to fold and can save printing materials (paper is the highest cost factor in web printing). Electrostatic clutch device. There are two electrostatic discharge sticks on the two sides of several paper strips, so that the paper is charged with static electricity, due to the role of static electricity, the paper is firmly "glued" together. It can prevent the paper from sliding so that it can be folded correctly in the subsequent process. (Finish)
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