Rubber roller use and maintenance troubleshooting

The offset ink supply system consists of a number of nylon rollers and rubber ink rollers. In order to make the rubber roller contact with the nylon ink roller and transfer ink under a certain contact pressure, the rubber roller must have good elasticity and minimal compression deformation. In addition, in the aspect of ink transferability, the rubber roller is different from the blanket in transferring ink. The rubber roller requires a large amount of ink absorption and low ink transmission rate. In order to make the ink system uniform in a very short time when the machine is printing, because the amount of ink absorbed on the roller is large, the ink transfer rate is low, but it can still transfer a sufficient amount of ink to the plate. The qualified rubber roller manufactured by the rubber roller factory has guaranteed the above technical requirements. However, if the method of use and maintenance is not correct, it will definitely make it lose this technical requirement and even shorten the service life.
Due to the high price of rubber rollers, each printing factory will easily replace the new rubber roller or rubber sleeve in a short period of time. Therefore, if it is found that the rubber roller can be solved in time after failure due to improper use and maintenance, to ensure continued use, it guarantees Printing quality, extend the life of the rubber roller. The reasons for the common failure of the rubber roller and its solutions are as follows.
1. The reason why the rubber surface vitrification affects the transmission of ink: The daily cleaning of the ink roller is not serious, and the ink roller is not completely or continuously printed for a few days, so that the roller performance layer and the pigment and the resin are oxidized to form a smooth and hard film.
Solution: 1 It should be ground or wiped with the smallest number of sandpapers, but it should be noted that the diameter of the roller cannot be changed too much. 2 Diligently wash the blanket, should use "high-efficiency ink cleaning agent" to clean the ink roller, cleaning effect is good.
2, the rubber roller local causes of cracks: 1 uneven pressure between the rollers; 2 roller two different heart solutions: 1 to adjust the pressure evenly; 2 replace the rubber roller.
3, rubber roller uneven local causes: 1 with 1; 2 between the ink roller pressure is too large; 3 contact surface or plastic liner peeling.
Solution: 1 with 1; 2 Press the press to adjust the pressure between the roller, replace the new rubber sleeve.
4. The reason why the small cracks appear on the entire surface of the rubber roller is as follows: 1 The pressure between the ink rollers is too large; 2 The rubber roller has a long shelf life under improper conditions, such as sunlight or heat.
Solution: Adjust the spoke gap, reduce the pressure, and immediately grind the surface.
5. The rubber roller has deep cracks on the entire surface. Causes: (1) Small cracks are not used after grinding; (2) Cots are stored near large motors and generators, because of the large amount of ozone and heat attack generated by these devices. Aging the surface of the ink roller and cracking it.
Solution: Grind the slight cracks and replace them with new ones.
6, the formation of rubber roller surface hardening reasons: due to long-term use of aging, long-term preservation of adhesion hardening of the ink film.
Solution: Grind it and replace it with a new one if necessary.
7. The surface of the rubber roller is softened or uneven: (1) Clean the rubber roller with banana water, benzene, acetone, etc.; (2) Clean the plate regularly with the revision fluid (paste), and then wipe it into the ink roller to get the rubber liquid. Dipping.
Solution: Same as 6
8. The rubber sleeves and the cores at both ends of the rubber roller are peeled off. Cause: An abnormal heating condition appears. Solution: Identify the cause of the heat and remove the heat. 9. The rubber roller is completely peeled. Cause: The pressure between the rollers is too large. The solution was not found in time. Solution: The pressure should be adjusted to an appropriate level. 10. Rubber is flat. Causes: 1 The rubber roller is stored on the floor or on the platform. The rubber sleeve is in contact with the floor or the platform and deformed under pressure. At work, add pressure.
Solution: 1 The semi-coil can be rotated in hot water to correct the deformation and make it recircle. If it cannot be corrected, it will be ground. 2 When the rubber roller is stored, it should be straightened at the journal end, and the surfaces should not touch each other or contact with other surfaces.