Rubber roller encapsulation and maintenance have a coup

 

   As we all know, the rubber roller is the "heart" of the offset printing machine, and has a close relationship with the quality of the printed products. There is no advantage of the rubber roller, the offset printing machine can't print the good product.

Now everyone is accustomed to removing all the rubber rollers at this time to maintain the cleaning and maintenance, or to take the rubber to the rubber roller rubber factory.

 

   The rubber roller has made a rubberized service, and it has been completely renewed. In the following days, how can the printing enterprise scientifically and correctly use and maintain the rubber roller? Here are some tips to use and maintain the rubber roller!

   

   Take a 4-color offset press as an example: the whole set of ink rollers of the four color groups of the machine is worth about 50,000 yuan. If carefully protected and scientifically adjusted, the average service life can reach 2 years; if used improperly, the average use Life expectancy will be shortened to 1 year or half a year. Therefore, strengthening employees' sense of responsibility and improving their operational skills are of great significance in ensuring product quality, reducing maintenance costs, improving economic efficiency, and promoting enterprise development.

 

一、The correct use of rubber roller

 

    1、 Correctly install the rubber roller bearing

First of all, the rubber roller should be cleaned on both sides, and then the bearings with specifications and models that meet the design requirements of the machine should be selected, and a layer of lubricating oil should be evenly applied on each mating surface, and the bearing should be evenly applied with a special sleeve for mounting the bearing. Make it fit in place. Do not apply force directly to the bearing surface to avoid damage to the bearing.

    2、Specification to adjust the pressure between the ink rollers

During the printing process, the water roller and the ink roller must continuously and evenly supply the printing plate with an appropriate amount of water and ink, so as to obtain a print with uniform ink color. Therefore, between the rubber roller and the rubber roller, between the rubber roller and the printing plate, the proper pressure must be maintained to achieve good ink transmission. In order to ensure the pressure between the water roller and the ink roller, the method of measuring the width of the ink bar must be adopted, mainly including the following points.

(1)  Add an appropriate amount of yellow ink evenly on a clean rubber roller, and then run the machine to evenly distribute the ink on the surface of the ink roller.

(2)  Jog the press to see the width of the press bar. It is worth noting that each time the width of the press bar is viewed, the press should be allowed to stand for about 20 seconds, and then the press is clicked to obtain a clear press bar.

(3)  The pressure between the plate roller and the squeezing roller should be preferentially adjusted, and then the contact pressure between the plate roller and the printing plate should be adjusted, and then the pressure between the other squeezing rollers should be adjusted separately.

(4)  Referring to the printing machine operating instructions, the pressure bar width between the ink rollers is generally 4 mm. However, for an ink roller having a small diameter and a good elasticity, the pressure bar width is preferably 3 mm; conversely, the pressure bar width is preferably 5 mm.

(5)  The width of the pressure bar between the water rollers should be 5 to 6 mm. The pressure of the water roller on the metering roller should generally be such that the water film at both ends of the water roller has no obvious water droplets.

(6)  When all the water roller and ink roller pressure are adjusted, it is necessary to fix each adjusting screw in time to prevent the printing machine from rotating and then all running.

 

    3、Correctly disassemble the rubber roller

Each time the rubber roller is disassembled, the adjustment screws should be loosened twice between the employees. When reinstalling the rubber roller, only 2 turns in the opposite direction can be used. Even if there is an error, it can be done quickly. At the same time, it is necessary to check the quality of each bearing. If it feels that it is shaking or blocking, it must be replaced immediately.

 

二、Correct maintenance method of rubber roller

 

     To extend the life of the ink roller, printing technology experts recommend that you keep the following in mind when working:

1、Ensure the lubrication of each bushing and shaft seat

In actual work, the water roller seat and the ink roller seat are often severely worn, and the roller will be crushed after the bearing is broken, which will cause greater loss. Therefore, before all the rubber rollers are installed, the bearings, bushings, shaft seats, brackets, etc. on both sides of the rubber roller should be smeared with lubricating oil to minimize the friction of the ink roller due to the back and forth movement of the ink roller. Its friction against the bearing housing.

2、Maintenance of various color roller sets of printing press

     The rubber roller of any printing machine will gradually become smaller after 2 to 3 months of use, thus affecting the accurate transmission of water and ink. At this time, the rubber rollers of each color of the printing press should be sequentially maintained, and the pressure between the rubber rollers should be re-adjusted.

3、Rubber roller cleaning

     The rubber roller should have good ink absorption and ink transmission, and the surface of the high-quality rubber roller is fine and smooth. However, since the rubber roller has to be in contact with water, ink, paper, etc. for a long time, it is inevitable that residues will accumulate on the rubber roller. Although the rubber roller is cleaned every time, some residues cannot be completely washed away. Over time, a smooth crystal layer similar to calcium is formed, which is firmly attached to the surface of the rubber roller and blocks it. Capillary pores make it lose its elasticity and become harder, which seriously affects the ink transfer and water transfer performance, so that it is impossible to stably control the ink color of the print.

 

 

     Some people think that it is a waste of time to use and maintain the rubber roller so carefully. I don’t know the ancients’ belief that “the sharpening of the knife does not mistake the woodworker” and the “cooking skill”, as long as the standardization operation is maintained for a long time, the technical skills can be continuously improved. For the sake of simplicity, the man-hours consumed thereby are greatly reduced, and the rubber roller is more fully utilized.