People who have long been engaged in the printing industry are well aware of the importance of printing rollers. Because it has a direct relationship with the printing plate and is inextricably linked to product quality, whether you are using an offset printing machine, a letterpress printing machine, a gravure printing machine, or a flexographic printing machine, you are faced with how to choose and debug skills. If you can't use it properly and follow its operation rules, not only can you not print ideal and hard products, but also damage the rubber roller, and also shorten the service life of the printing plate. It is difficult to adjust the printing rubber roller to the optimal level and ideal point, which can not be mastered overnight. Because it does not have a fixed program, it takes all the opportunity to summarize, explore, excavate, innovate, and sort out a set of effective printing skills in the long-term production practice. So it is very important to adjust the printing rubber roller.
The following is a comprehensive discussion on the selection, use, commissioning and maintenance of printing rubber rollers.
Selection of printing rubber rollers With the rapid development of the market economy, new equipment, new processes, new materials, especially new printing equipment have also emerged. The replacement is also relatively timely, and the domestic printing equipment also tends to be high in technology, durable, and advanced. From the point of view of the international printing industry, there are data showing that some developed countries such as Europe and America are still ahead of us in printing equipment. Although the domestic printing industry introduced many printing machinery and printing equipment from developed countries in the 1990s, when the printing rubber rollers need to be replaced after a certain number of years, the domestic printing rubber rollers are far less than the rubber rollers of the original equipment.
In the past, printing companies all set up "glue rooms", which specialize in the production of printing rubber rollers, which caused serious pollution. With the development of the printing industry and the replacement of equipment, traditional old-fashioned printing rollers are gradually being eliminated because they cannot meet the needs of high-speed printing presses. Its disadvantage is that it can not adapt to high temperature and high humidity environment. It becomes soft at high temperature and hardens at low temperature, especially it is not suitable for printing gold and printing screen plate, which hinders the improvement of printing quality.
In the 1980s, there was a major revolution in printing rubber rollers. The new rubber rollers were not restricted by climatic conditions and had good strength and corrosion resistance. However, the high cost made SMEs prohibitive. With the rapid development of the economy, it is still well received by the majority of users.
Commissioning and correct use of printing rubber rollers No matter what type of printing machine or model is installed in the new equipment, the technicians and collar machine must first install the printing rubber rollers The installation level of the rubber roller must be adjusted reasonably, and it must be in close contact with the ink roller and the printing plate, both of which are indispensable. The printing practitioners all know that the height of the relief is 3.14mm, which is consistent with the height of the typeface, and the PS version is relatively low at 1.2mm, so you must be aware when installing and debugging the rubber roller. If it is a printed product with a background color, the rubber roller can be adjusted lower, the error is ± 0.5mm, so that the ink transferred by the ink roller to the printing rubber roller is more uniform, and the same is true when the printing rubber roller is reflected on the printing plate The effect of the printed product is pleasing to the eye. If it is not the case, there will be ink bars, ink channels and other phenomena.
When printing text, the height of the rubber roller is basically equal to or slightly lower than that of the text version, so that the printing rubber roller can gently rub the printing plate, so that the text is printed very clearly, cleanly, and the rubber roller wear surface is small Not easy to damage, can extend the life of the printing plate. The adjustment roller should be used for adjustment. Before use, take out the printing plate and let the roller adjust horizontally in and out several times. The size of the ink dot on the roller is immediately displayed. The operator can determine the level of the printing roller according to different printing needs. Tighten the top wire. In this way, the height of the rubber roller will not change during high-speed printing. If we lack patience when using rubber rollers and are eager to get a picture in order to save trouble, the following situations will occur: (A) The surface of the rubber roller is damaged and the slag is dropped, which makes the text printing missing the pen, and the text is blurred or even appears. Blurry, jumping glue phenomenon. (B) The text is inked differently, and even the surface of the printed product has only the mark of the text but no ink color. (C) If the rubber roller is adjusted to be too tight with the ink transfer rubber roller, it will also cause the printing rubber roller to be twisted and cause economic losses and equipment accidents.
Maintenance of printing rubber roller The key to the offset printing technology is the control of the water and ink balance, and the water and ink balance depends on the key components of the rubber roller and the ink roller. Their quality can directly affect the quality of the product. This is particularly true of gravure, embossing and flexo printing. General printing companies maintain equipment once a week, including the maintenance of printing rollers. The maintenance methods are as follows:
1. After the production operation is completed every day, the rubber roller should be carefully cleaned and repeated twice;
2. The designated printing chemicals must be used for cleaning the printing roller, such as industrial alcohol, etc. Corrosive solvents must not be used;
3. Remove rubber rollers during holidays to prevent deformation under pressure;
4. For the protection of the surface of the printing rubber roller, it should be wrapped in newsprint and placed in a ventilated and dark place.
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