Problems with rubber rollers in the printing process

1. The surface of the rubber roll is crystallized and calcified. The surface of the high-quality rubber roll should be fine and smooth, with a slightly sticky feel, and good ink transfer performance. However, due to the long-term impact of the fountain roller, ink, paper, and other factors, combined with each cleaning can not be completely thorough, making a variety of materials layered on the surface of the roller, over time, it will close the original surface of the roller Some capillary pores form a smooth crystalline layer that resembles calcium, which seriously affects the properties of ink transfer and water transfer, and it is impossible to control the ink color of printing materials stably. In order to solve this problem, at the beginning, a special lifting paste was used to clean up the water, but it was time-consuming, laborious, and virtually increased the production cost. Later, after each wash, try to wash it with some citric acid again to cause some calcium impurities on the surface of the rubber roll to react chemically to form easily soluble substances 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 have scars and juts. Because the rubber roller is relatively soft, a hard object will be scratched during the high-speed operation. In particular, the alcohol dampening solution relies on the printing roller, and once scratches occur, it can no longer be used. . There are two main reasons for this: First, the plate is not tight or the clamps are not tight. There are often cracks and cracks at the tip of the printing plate. The scratches are caused by the printing water and the ink roller. Second, the ink roller is not maintained in time. , The rubber roller on the skin, ink residue and other impurities, accelerated the rubber roller friction, heat, aging, so that the surface of the roller covered with eyes, the general two rollers more serious.

3. There are many reasons for premature cracking and aging of the rubber roller. For example, excessive dry oil in the ink causes the ink to dry on the roller; the cleaning agent used to clean the roller is improperly selected and the cleaning time is too short. The impurities on the roller can not be thoroughly cleaned; the ambient temperature of the workshop is high, and the dampening cooling system is not working well, so that a large amount of heat generated during the operation of the roller cannot be dissipated in time, and the roller cohesion temperature is high: the roller bearing performance Poor, it is rotated by the ink stringer, resulting in beating, squeezing, etc. All these factors will accelerate the early cracking and aging of the rubber roller.

Reprinted from: Silver Star Cots