Brief analysis of the installation and commissioning of printing rollers and the correct use


Published on:

2019-01-03

Abstract: Printing machinery installation - maintenance - maintenance - after-sales section: The article mainly introduces the printing machine installed in place after the first by the technical staff and the lead machine to install the printing rubber rollers, regulate the adjustment of water, ink roller pressure and other related knowledge points. A brief analysis of the installation and commissioning of printing rollers and the correct use of whether you are using letterpress, gravure printing presses, flexographic printing presses, offset printing presses are faced with the problem of how to install and commission rubber rollers. If you can't make reasonable use of it and follow its operation rules, not only can't print ideal and hard products, but also damage the rubber roller and shorten the service life of the printing plate. Adjust the printing rollers to the best degree and reason

Brief analysis of the installation and commissioning of printing rollers and the correct use

Abstract: Printing machinery installation - maintenance - maintenance - after-sales chapter: The article mainly introduces the printing machine installed in place first by the technical staff and the lead machine to install the printing rubber rollers, regulate the adjustment of water, ink roller pressure and other related knowledge points.

 

Brief analysis of the installation and commissioning of printing rollers and the correct use

Whether you are using letterpress, gravure printing presses, flexographic printing presses, offset printing presses are faced with the problem of how to install and debug the rollers. If you do not use it properly and follow its operation rules, not only will you not be able to print ideal and hard products, but you will also damage the rollers and shorten the life of the printing plate. The printing roller adjustment to the best degree and the ideal point has some difficulty, not overnight can master. Because it does not have a fixed program, all by the lead machine in the long-term production practice summary, feel, digging, innovation, finishing a set of effective printing skills. So it is important to debug the printing rollers.

Mounting of printing rollers

Regardless of any printing machine species, models in the new equipment installed in place, first by the technical staff and the lead machine to install the printing roller. The installation height of the rubber roller must be adjusted reasonably, it must be in close contact with the ink roller and printing plate, one without the other. Printing practitioners know that the height of the letterpress plate is 3.14mm, and the height of the lead is the same, while the PS version is relatively low at 1.2mm, so we must have a good idea when installing and debugging the rubber roller.

Ensure the lubrication of each bearing and shaft seat of the printing rollers. Before all the rubber rollers are installed, the appearance of the bearings at both ends of the rubber rollers and the rubber roller bearing sleeves and supports on the machine should be lubricated with oil. Apply once, in order to minimize the friction between them due to the rotational impact formed by the back and forth movement of the ink roller. If often found against the plate water, ink roller sleeve and both sides of the shaft seat in a very short time has been seriously worn, only to re-welding and processing, and the ink roller bearings are often bad often changed, and even because the bearing broken after rolling bad roller surface, resulting in greater losses.

Commissioning of printing rollers

Regulating the pressure of water and ink rollers is a very important step. If the pressure is adjusted too lightly, it will easily lead to poor water and ink transfer; if the pressure is adjusted too heavily, it will artificially increase the friction between the rollers, make the ink rollers warm up and heat up, aggravate the squeezing and expansion between the rubber rollers, accelerate the cracking and aging, and also affect the product quality. There was an operator who mistakenly adjusted the pressure between the hard roller and the rubber roller too heavily when changing the rubber roller, so that the new rubber roller was cracked and scrapped just after starting a shift. In addition, if using alcohol fountain solution, 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 printed with base color, the rubber roller can be adjusted a little bit lower, the error is ±0.5mm, so that the ink roller transfer to the printing rubber roller ink is more uniform, and the printing rubber roller reflects to the printing plate when the same effect, the printed products make people pleasing to the eye, if not, there will be ink bar, ink channel and other phenomena. When printing text, the height of the rubber roller is basically level with the text version or a little lower, so that the printing roller gently rubbing the printing plate, so that the text is printed very clear, clean, the rubber roller wear surface is small and not easily damaged, which can extend the use of the printing plate. Adjustment should be used to adjust the rubber roller. Before the use of the printing plate out of the first let adjust the rubber roller horizontal stretch pulled out several times, adjust the size of the ink dot on the rubber roller will immediately show, the operator can determine the printing roller according to the different needs of the high and low degree, and then the top of the silk rope firm. This way, the height of the roller will not change when printing at high speed. If we lack patience when using the rollers, debugging is eager to save time, the following situation will occur:

(A) the surface of the rubber roller is broken, falling slag, so that the text printing lack of pen broken channel, the text is blurred, and even appear paste blind, jumping rubber phenomenon.

(B) text inking inconsistency, and even the surface of the print only text marks but no ink color.

(C) if the rubber roller debugging to and ink transfer rubber roller is too tight, but also the printing roller twist bad cause economic losses and equipment accidents.