Regardless of whether you are using a letterpress printing machine, gravure printing machine, flexographic printing machine, offset printing machine, you are faced with the problem of how to install and debug the rubber roller. 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.
Printing roller installation
Regardless of the type and model of any printing machine, after the new equipment is installed in place, the printing rubber roller must be installed by the technician and the collar machine. 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.
Ensure the lubrication of the bearings and shaft seats of the printing rubber rollers. Before installing all the rubber rollers, lubricate the appearance of the two ends of the rubber rollers and the rubber roller bearing sleeves and brackets on the machine. Apply it again to minimize the rotational impact friction between them due to the back and forth movement of the ink roller. If it is often found that both sides of the plate water, the ink roller sleeve and the shaft seat have been seriously worn out in a short time, they have to be re-welded and processed, and the ink roller bearings are often damaged and replaced, even the rollers are broken after the bearings are broken Surface, causing greater losses.
Commissioning of printing rubber roller
Regulating the pressure of water and ink rollers is a very important step. If the pressure is adjusted too light, it will easily lead to poor water transfer and ink transfer; if the pressure is adjusted too heavy, the friction between the roller and the roller will be artificially increased, causing the ink roller to heat up and heat, and the squeezing between the rubber rollers Accelerate its cracking and aging, and at the same time product quality will also be affected. When the operator changed the rubber roller, the pressure between the hard roller and the rubber roller was adjusted to be too heavy, so that the new rubber roller was cracked and scrapped just after starting a shift. In addition, if alcohol dampening solution is used, the pressure adjustment of the water roller should be especially careful to prevent its service life from being reduced due to passive transmission.
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 debugging is eager to save money, 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 breaks the road, the text is blurry and unclear, and even the phenomenon of slurring and glue jumping occurs.
(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.
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