Rubber roller is an important part of the printing press
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The rubber roller is an important part of the printing machine, but in actual production, the maintenance work of the rubber roller is often neglected, resulting in shortened service life of the rubber roller, increased maintenance cost, and difficulty in improving product quality. Among them, there are quality problems of the rubber roller itself, but the most important one is related to the operation method of the operator. In this regard, combined with years of practical experience, a brief analysis of several issues that should be noted in the use of rubber rollers.
Attention should be paid to the installation and adjustment of the rubber roller
1. Correct installation of new rubber roller bearings
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 tap it at will, so as to avoid damage to the bearing before it is used.
2. Ensure the lubrication of each bearing and shaft seat of the rubber roller
Before all the rubber rollers are installed, the outer surface of the rubber roller bearing and the rubber roller bearing sleeve and bracket on the machine should be coated with lubricating grease to minimize the friction between them. Rotating impact friction. It is often found that some of the water, the roller sleeve and the shaft seat have been worn out in a short time, and they have to be re-welded and processed, and the roller bearings are often changed frequently, even after the bearing is broken. The drum surface causes more damage. The reason is mainly that the lubrication work of the contact surfaces of the individual workpieces is not done well.
3. Standard regulation of water and ink roller pressure
After the water and ink rollers are installed on the machine, they must be adjusted to their respective pressures in strict accordance with the specifications. The pressure is too light, which may lead to poor water transfer and poor ink transfer. If the pressure is too heavy, the friction between the roller and the roller will be artificially increased, so that the ink roller will heat up and increase the squeeze expansion between the rubber rollers. Accelerate the aging of the wrinkles, and the quality of the product will be affected, the harm is self-evident. When the operator changed the rubber roller, the pressure between the hard roller and the rubber roller was adjusted too much, so that just after starting a shift, the new rubber roller was cracked and scrapped. In addition, if the alcohol dampening solution is used, the pressure relationship of the water roller is particularly carefully adjusted to prevent the service life from being lowered due to passive transmission.
Frequent problems in the printing process of rubber rollers
1. Crystallization and calcification of rubber roller surface
The surface of the high-quality rubber roller should be fine and smooth, the hand feels slightly sticky, and has good ink transfer performance. However, since the rubber roller is affected by factors such as dampening solution, ink, paper and the like for a long time, it is impossible to completely completely clean each time, so that various substances are piled up on the surface of the rubber roller layer by layer, and over time, the surface of the rubber roller is closed. Some capillary pores form a smooth crystalline layer similar to calcium, which seriously affects the ink transfer and water transfer performance, and cannot stably control the ink color of the print. In order to solve this problem, it was initially cleaned with a special scented paste and effluent water, but it was time consuming and laborious, and invisibly increased the production cost. Later, after each wash, try to wash it with some citric acid water to chemically react some calcium impurities on the surface of the rubber roller to form a soluble substance for cleaning. Practice has proved that this method works well and saves money and effort.
2. The surface of the rubber roller is easy to be scratched and numb
Because the rubber roller is relatively soft, a slight hard object will be scratched during high-speed operation. In particular, the alcohol dampening solution relies on the plate water roller, and once scratches occur, it can no longer be used. There are two main reasons: one is that the plate is not tight or the clip is not tight, the plate has cracks and cracks at the tip of the plate, scratches against the plate water and ink roller; second, the ink roller is not maintained in time. There are many impurities such as ink and ink residue on the rubber roller, which accelerates the friction, heat and aging of the rubber roller, and makes the surface of the rubber roller full of numbness. Generally, the rubber roller is more serious at both ends.
3. Rubber roller prematurely splitting and aging
There are many reasons for this problem, such as excessive dry oil in the ink, so that the ink is dry on the rubber roller; the cleaning agent used for cleaning the rubber roller is improperly selected, and the cleaning time is too rushed to make the total impurities on the rubber roller Can not be thoroughly cleaned; the ambient temperature of the workshop is high, and the dampening cooling system works poorly, so that a large amount of heat generated during the operation of the rubber roller cannot be dissipated in time, and the cohesive temperature of the rubber roller is very high: the performance of the rubber roller bearing is not good, and the ink roller is inferior. With the rotation, it produces frictional friction, extrusion and so on. All of these factors will accelerate the early splitting and aging of the rubber roller.
Strengthen the regular maintenance of the rubber roller
Nowadays, all printing houses attach great importance to machine maintenance. Among them, water and ink roller are one of the key maintenance contents. According to the production experience, pay attention to the following aspects when maintaining the rubber roller.
1. Check whether the bearings at both ends of the rubber roller are freely movable. If the condition is good, if it is loose or worn, it should be replaced in time to avoid further damage.
2. Scrub the surface of the rubber roller to remove impurities such as ink, ink residue and the like.
3. Check whether the rubber on the surface of the rubber roller is good, especially the plate rubber roller must choose the best one. For the rubber roller with surface peeling and more eyes, it should be re-polished or cast in time.
4. Before installing the rubber roller, be sure to apply grease to the mating surface of each rubber roller to prevent damage to these components.