Debugging and maintenance of printing rubber roller

selling Shaft Roller silicone Rubber Coated Rollers For Printing Machine

People who have been engaged in the printing industry for a long time are very aware of the importance of printing rubber rollers. Because it has a direct relationship with the printing plate and is inextricably linked with product quality, whether you are using offset printing machines, letterpress printing machines, gravure printing machines, or flexographic printing machines, you are faced with how to select and debug skills. If you can't use it reasonably and follow its operation rules, not only can't print ideal and excellent products, but also damage the rubber roller, and shorten the service life of the printing plate. It is difficult to adjust the printing rubber roller to the optimum level and ideal point, and it cannot be mastered overnight. Because it has no fixed program, it depends on the leader to summarize, explore, excavate, innovate and sort out a set of effective printing skills in the long-term production practice. Therefore, it is very important to debug the printing rubber roller. The selection, use, debugging and maintenance of the printing rubber roller will be comprehensively discussed below.

Selection of printing rubber rollers: With the rapid development of the market economy, new equipment, new processes, new materials, especially new printing equipment are also produced. The replacement is also relatively timely, and domestic printing equipment also tends to be high-tech, durable, and advanced. From the perspective of the international printing industry, some data show that some developed countries such as Europe and the United States are still ahead of us in terms of printing equipment. Although the domestic printing industry entered the 1990s and introduced many printing machinery and printing equipment from developed countries, when the printing rubber rollers need to be replaced after a certain number of years, the domestic printing rubber rollers are far inferior to the original equipment.   

In the past, printing companies had built-in "glue rooms" which specialized in the production of printing rubber rollers, causing serious pollution. With the development of the printing industry and the replacement of equipment, the traditional old-fashioned printing rubber rollers are gradually eliminated because they cannot meet the needs of high-speed printing machines. Its disadvantage is that it cannot adapt to high temperature and high humidity environment, it becomes soft at high temperature and hardens at low temperature, especially for printing gold and screen printing plates, 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, but the high cost made small and medium-sized enterprises discouraged. With the rapid development of the economy, it is still well received by the majority of users.   

Debugging and correct use of printing rubber rollers: Regardless of any type of printing machine or model, after the new equipment is installed in place, the printing rubber rollers must first be installed by technicians and leaders. The installation height 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. Printing practitioners know that the height of the letterpress is 3.14mm, which is consistent with the height of the lead type, while the PS plate is relatively low at 1.2mm, so you must be aware of it when installing and debugging the rubber roller. If it is printing a printed matter with a background color, the rubber roller can be adjusted a little lower, and the error is ±0.5mm, so that the ink transferred from the ink roller to the printing rubber roller is relatively uniform, and the printing rubber roller is also reflected on the printing plate. The effect, the printed product is pleasing to the eye, if not, 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 the text plate, so that the printing rubber roller can gently rub the printing plate, so that the text is printed very clearly and neatly, and the wear surface of the rubber roller is small It is not easy to be damaged, which can extend the service life of the printing plate. Adjustment roller should be used when adjusting. Before use, take out the printing plate and let the rubber roller extend in and out horizontally several times, the size of the ink dots on the rubber roller will be displayed immediately, and the operator can determine the height of the printing rubber roller according to the different printing needs, and then Fasten the top wire. In this way, the height of the rubber roller will not change during high-speed printing. If we are impatient when using rubber rollers, and the debugging is eager to achieve results and save trouble, the following situations will occur:
(A) The surface of the rubber roller is damaged and slag falls off, causing the text to be printed without pens and lines, the text is blurred, and even the phenomenon of blurring and glue jumping occurs.
(B) The ink of the text is different, and even there are only text marks on the surface of the printed product but no ink color. (C) If the rubber roller is adjusted to be too tight with the ink transfer rubber roller, the printing rubber roller will be twisted and damaged, resulting in economic losses and equipment accidents.   Maintenance of printing rubber rollers: In offset printing technology, the key is to control the balance of water and ink paths, while the balance of ink and water depends on the key components of rubber rollers and ink rollers, and their quality can directly affect product quality. This is especially true for gravure, embossing, and flexo printing.

General printing companies have to maintain their equipment once a week, including the maintenance of printing rubber rollers. The maintenance methods are as follows:   
1. The rubber roller should be carefully cleaned after the daily production operation is completed, and washed twice;   
2. To clean printing rubber rollers, specified chemicals, such as industrial alcohol, must be used, and corrosive solvents must not be used;   
3. The rubber roller should be removed when resting on holidays to prevent deformation under pressure;   
4. For the protection of the surface of the printing rubber roller, it should be wrapped with newsprint and placed in a ventilated and dark place.

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Post time: Dec-05-2022