In the selection of rubber rollers and cleaning agents, we should pay attention to comprehensive benefits, reduce synthesis and costs, improve printing quality, and enhance corporate competitiveness.
installation
Install the new rubber roller bearing correctly. First clean the impurities on both ends of the new rubber roller, then select bearings that meet the design requirements with specifications and models, apply lubricant to each mating surface, and beat the special bearing sleeve hard correctly and evenly until the bearing is installed in place. Never apply force directly to the bearing and knock it at will to prevent the bearing from being damaged before it is used.
Ensure the lubrication of each bearing and shaft seat of the rubber roller. Before the rubber roller is installed, the surface of the two ends of the rubber roller and the rubber roller bearing sleeve and bracket on the machine should be coated with grease to minimize the rotation, impact and friction caused by the back and forth movement of the ink roller. Reduce wear on both sides of the rubber roller sleeve and shaft seat.
In recent years, UV printing has been widely used, and UV and ordinary dual-purpose ink rollers have appeared. The installation method of UV and ordinary dual-purpose ink roller is as follows.
1. New ink roller adaptation procedure
When the new set of rubber rollers is installed and ready to be printed with UV ink, the ink roller must be run with UV transparent ink or UV ink for 2 to 3 hours to allow the ink roller to fully adapt to the UV ink, and then washed with UV washing water Only then can the UV printing process. If you do not follow the above procedure, some UV ink may become hard and accumulate on the surface of the ink roller, resulting in uneven ink application, heat generation, and difficulty in cleaning. The ink roller is also easy to wear. If the new ink roller is used for ordinary ink printing, it can be printed after being installed.
2. UV ink printing and ordinary ink printing conversion program
When changing from UV ink to ordinary ink, the ink roller should be washed with special UV washing machine water, and then printed with ordinary ink. Before printing, check whether all ink rollers have been fully inked. When changing from ordinary ink to UV ink, UV printing can be performed after cleaning the ink roller. But if you find that the ink is not good, you can use UV transparent ink or UV ink to make the ink roller run for about 12 hours before UV printing.
debugging
To accurately determine the appropriate position of the rubber roller on the printing press, regulate the pressure of the water roller and ink roller. The position of the rubber roller is directly related to the uniformity of ink transfer and ink brushing, directly affecting the quality of printing, and also directly affecting other aspects, such as the life of the rubber roller. The contact pressure between the ink rollers should be kept uniform and moderate. If the pressure is too large, the rubber roller will be deformed under pressure. The colloid will expand due to excessive heat distribution, and the ink will become thinner easily due to heat. It may even "degumm" and affect the quality of the printing ink; On the other hand, it is easy to damage the rubber roller shaft head (bearing) or shaft hole. Ink roller height adjustment is also very important, too high adjustment will cause uneven ink distribution, too low will easily scratch the colloid, and increase plate wear. In general, the contact between the inking roller and the printing plate can generally be placed on the printing plate with a strip of about 40g / m2 with strong toughness. When the inking roller is rolled up, the paper strip is pulled and there is a sense of pressure resistance.
The height adjusted by the rubber roller is also related to the structure of the printed matter. If it is a printed product with a background color, the rubber roller can be adjusted a little 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 printed product is pleasing to the eye, otherwise, ink is prone to appear Bar, ink channel, etc. 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. When adjusting, you should use the rubber roller. Take out the printing plate and let the rubber roller extend horizontally and pull out several times. The size of the ink dot on the rubber roller will be displayed immediately. The operator can determine the printing glue according to different printing needs. The height of the roller, and then lock the top wire so that the height of the rubber roller will not change during high-speed printing. Be patient when debugging the rubber roller, so as to avoid the following situations: the surface of the rubber roller is damaged, the slag is dropped, the graphics are blurred, the text is not cut off, and even the paste, jumping glue; the graphics are inked, and even the surface of the printed matter is only The graphic prints have no ink color; the adjustment is too tight and twists the printing rubber roller, causing equipment accidents.
use
1. Requirements for the use environment of rubber rollers
Printing in a hot, humid, dusty environment, coupled with high-speed operation of the machine, will continuously increase the surface temperature of the rubber roller, expand the colloid, increase the friction of the rubber roller, affect product quality, and shorten the service life of the rubber roller.
For printing companies with conditions, the offset printing workshop should install air conditioners and keep the workshop tidy and clean.
2. Problems that should be paid attention to in printing production
(1) Power on
It must be started with ink. If it is not used in a certain shaft seat, it must be filled with lubricant. The water roller should also be run with water, and must not be "dry milled", otherwise, the rubber roller will be scrapped quickly.
(2) Long time shutdown
The ink roller will be pressed at a certain fixed position, so there is a possibility of partial depression. At this time, it is best to remove the ink roller, clean it and put it on the ink holder for use. Do not place it directly on the table to prevent the rubber roller from being deformed under pressure.
(3) Rubber roller aging
The rubber roller has been used for a long time and aging, coupled with the erosion of chemicals, causing rotten rubber to "slag". Such a rubber roller is best updated in time to avoid seriously affecting the quality of printing.
(4) The temperature of the production environment is too low
At this time, the ink is not easy to be evenly mixed, and auxiliary materials can be added to the ink appropriately. It is strictly prohibited to bake the ink roller with infrared heaters.
(5) Sundries
During the printing operation, the offset press table should be kept clean and tidy, and tools and printing supplies such as ink shovel should not be placed randomly, and the sundries and hard ink blocks should not be caught in the ink roller to scratch or roll the ink roller.
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