Whether you are using a letterpress, gravure, flexo or offset press, you are faced with the problem of how to install and commission the rollers. If you can not reasonably use and follow its operating rules, not only can not print the ideal and excellent products, it will damage the rubber roller, but also shorten the service life of the printing plate. It is difficult to adjust the printing roller to the optimum degree and ideal point, and it is not possible to master it overnight. Because it does not have a fixed program, it is based on long-term production practice to summarize, explore, explore, innovate and organize a set of effective printing skills. Therefore, it is very important to debug the printing roller.
Printing rubber roller installation
Regardless of any type of printing machine or model, after the new equipment is installed, the printing roller must be installed by the technician and the leader. The installation of the rubber roller must be properly tuned. It must be in close contact with the ink roller and the printing plate, and both are indispensable. The printing practitioners know that the height of the letterpress is 3.14mm, which is consistent with the height of the typeface, while the PS version is relatively low at 1.2mm, so be sure to know when installing and adjusting the rubber roller.
Ensure the lubrication of each bearing and shaft seat of the printing rubber roller. Before all the rubber rollers are installed, the lubricating oil should be used for the outer surface of the rubber bearing and the rubber bearing sleeve and bracket on the machine. Apply once to minimize the rotational impact friction between them due to the back and forth of the ink roller. If it is often found that the plate water, the roller sleeve and the shaft seat are severely worn in a short time, they have to be re-welded and processed, and the roller bearings are often changed frequently, even after the bearing is broken. The surface causes greater damage.
Printing rubber roller
It is an important step to regulate the pressure of water and ink roller. The pressure is too light, which may lead to poor water transfer and poor ink transfer. If the pressure is too heavy, the friction between the roller and the roller will be artificially increased, so that the ink roller will heat up and increase the squeeze expansion between the rubber rollers. Accelerate its cleavage and aging, while product quality is also affected. When the operator changed the rubber roller, the pressure between the hard roller and the rubber roller was adjusted too much, so that just after starting a shift, the new rubber roller was cracked and scrapped. In addition, if alcohol dampening solution is used, the pressure adjustment of the water roller is especially careful to prevent the service life from being reduced due to passive transmission.
If the printed product has a ground color, the rubber roller can be adjusted to a lower degree with an error of ±0.5 mm, so that the ink delivered to the printing roller by the ink roller is relatively uniform, and the printing rubber roller is also reflected on the printing plate. The effect is that the printed products are pleasing to the eye. If not, there will be phenomena such as ink sticks and ink paths. When printing text, the height of the rubber roller is basically flat or slightly lower than the text version, so that the printing rubber roller can gently rub the printing plate, so that the text is printed clearly and cleanly, and the rubber roller wear surface is small. Not easy to damage, can extend the life of the plate. The adjustment roller should be used for adjustment. Before use, remove the printing plate and let the adjusting roller horizontally extend and pull out several times. The size of the ink dot on the rubberizing roller will be displayed immediately. The operator can determine the level of the printing rubber roller according to different printing requirements, and then Put the top thread firmly. Thus, the height of the rubber roller does not change during high-speed printing. If we are impatient when using rubber rollers, and debugging is eager to save trouble, the following will happen:
(A) The surface of the rubber roller is damaged, and the slag is dropped, so that the text is printed and the pen is broken, the text is blurred, and even the phenomenon of paste and gel is observed.
(B) The text is different in ink, and even the surface of the printed product has only the text mark but no ink color.
(C) If the rubber roller is adjusted to be too tight with the transfer rubber roller, the printing rubber roller will be damaged to cause economic loss and equipment accident.