Rubber roller use precautions (1)
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In the selection of rubber rollers and their cleaning agents, we should pay attention to comprehensive benefits, reduce integration and cost, improve printing quality, and enhance corporate competitiveness.
Installation
Install the new rubber roller bearing correctly. Firstly, clean the impurities at both ends of the new rubber roller, and then select the bearings whose specifications and models meet the design requirements, apply the lubricating oil on each mating surface, and beat the special bearing sleeve correctly and evenly until the bearing is installed in place. Do not directly apply force to the bearing, and feel free to knock 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 outer surface of the rubber roller and the rubber roller bearing sleeve and bracket on the machine should be coated with lubricating grease to minimize the rotation, impact and friction formed by the back and forth of the ink roller. Reduce wear on both sides of the rubber sleeve and the shaft seat.
In recent years, UV printing has been widely used, and UV and ordinary dual-purpose ink rollers have appeared. The installation of UV and ordinary dual-purpose ink rollers is as follows.
1. New ink roller adaptation program
Before installing a new set of rubber rollers and preparing to print with UV ink, the ink roller must be run for 2 to 3 hours with UV transparent ink or UV ink, so that the ink roller is completely adapted to the UV ink, and then washed with UV washing machine water. The UV printing process is available. If not in accordance with the above procedures, some UV inks may become hard and accumulate on the surface of the ink roller, resulting in uneven ink, heat and difficult to clean, and the ink roller is also prone to wear. If ordinary ink is used for printing with ordinary ink, it can be printed after loading.
2.UV ink printing and ordinary ink printing conversion program
When changing from UV ink to ordinary ink, the ink roller should be cleaned with special UV washing machine water, and then printed with ordinary ink. Before printing, all the ink rollers should be completely inked. When converting from ordinary ink to UV ink, UV printing can be performed after cleaning the ink roller. However, if it is found that the ink is not good, the ink roller can be operated with UV transparent ink or UV ink for about 12 hours before UV printing.
Debugging
To accurately determine the proper position of the rubber roller on the printing press, regulate the water and ink roller pressure. Whether the position of the rubber roller is suitable or not is directly related to the uniformity of ink transfer and ink brushing, directly affecting the quality of the printed product, and directly affects 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 the heat of distribution. The ink will be easily thinned by heat and even “degumming”, which will affect the quality of the printing ink; On the other hand, it is easy to damage the rubber roller shaft (bearing) or the shaft hole. It is also important to adjust the height of the inking roller. If it is too high, the ink will be unevenly distributed. If it is too low, it will easily scratch the gel and increase the wear of the printing plate. When the inking roller is in contact with the printing plate, a tough paper strip of about 40 g/m2 is generally placed on the printing plate, and when the inking roller is rolled up, the paper strip is pulled to have a feeling of pressure resistance.
The height of the rubber roller adjustment is also related to the structure of the print. If the printed product has a ground color, the rubber roller can be adjusted lower, the error is ±0.5mm, so that the ink delivered to the printing roller by the ink roller is relatively uniform, and the printed product is pleasing to the eye, otherwise it is easy to appear. Ink bar, ink path, etc. 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. When adjusting, you should use the rubberizing roller. First 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 printing adhesive according to the different needs of printing. The height of the roller is then locked, so that the height of the rubber roller does 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 removed, the graphic is ambiguous, the text is missing, the paste is broken, and even the paste is glued; the image is different, even the surface of the printed product Only the graphic prints have no ink color; the adjustment is too tight and the printing rubber roller is broken, causing equipment accidents.