Offset machine rubber roller should pay attention to six problems in use
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1. The printing rubber roller mainly transfers ink on the offset printing machine. Therefore, the cleaning of the rubber roller must be carefully cleaned, otherwise the surface layer of the rubber roller and the pigment and resin will be oxidized to form a smooth and hard film, which will cause the surface to become vitrified and affect the ink transfer. If it is not cleaned frequently, the surface of the rubber roller will be uneven and not easy to use. Therefore, the rubber roller should be washed and put back for use during shutdown.
2. In the offset printing operation, the ink is emulsified due to “large water and large ink”, and a hydrophilic foundation is formed on the smooth rubber roller to deink the ink. The solution is to shovel the emulsified ink, wash the deinking roller with gasoline, mix it with 5% sodium hydroxide solution and pumice powder, and treat the metal roll (or hard roll) accordingly. The hard roller can also be sanded with fine water sand in the state of water spray. Be careful not to stay in the same place, otherwise the rubber roller will be damaged. The fundamental method is to control the pH of the water hopper and do a good job of water and ink balance.
3. The rubber roller is used for a long time, and the chemical is eroded, causing the rubber to drop the “slag”. It is better not to use the rubber roller, otherwise the quality of the printed product will be seriously affected.
4. In order to ensure that the production and printing quality is not affected, there must be a spare ink roller, but do not store too much to avoid aging. The rubber roller is stored in the same environment as the blanket. In addition, the rubber roller should be straight and straight at the journal, and the surfaces should not touch each other or contact with other items to avoid deformation of the rubber roller.
5. Rubber rollers should not be stored in close proximity to large motors and generators. Because the large amount of ozone generated by these devices causes the surface of the rubber roller to age and crack.
6. When the weather is cold, the ink is not evenly distributed. It is appropriate to add auxiliary materials to the ink. It is forbidden to bake the ink roller with equipment such as infrared heater to prevent the rubber roller from oxidizing.