1. The surface of the printing rubber roller is prone to scratches: because the rubber roller is relatively soft, a little hard object will be scratched during high-speed operation, especially the alcohol fountain solution against the plate water roller. use. There are two main reasons:
(1) The printing plate is not pulled tightly or the plate clamp is not tightly clamped, and there are often cracks and cracks at the trailing tip of the printing plate, which scratches the plate water and ink roller;
(2) The ink roller is not maintained in time, and there are many impurities such as ink skin and ink residue on the rubber roller, which accelerates the friction, heat generation and aging of the rubber roller.
The surface of the rubber roller is covered with pockmarks, and the two ends of the rubber roller are generally more serious.
2. Crystallization and calcification on the surface of the printing rubber roller: The surface of the high-quality printing rubber roller should be fine and smooth, with a slightly sticky feel and good ink transfer performance. However, due to the long-term influence of the fountain solution, ink, paper and other factors on the rubber roller, and each cleaning cannot be completely thorough, various substances accumulate on the surface of the rubber roller layer by layer. Over time, the original surface of the rubber roller will be closed. Some capillaries 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 printed matter.
3. Premature cracking and aging of the printing rubber roller: There are many reasons for this problem, such as excessive drying oil in the ink, which causes the ink to dry and heat on the rubber roller; improper selection of cleaning agent for cleaning the rubber roller, cleaning The time is too rushed, so that the impurities on the rubber roller cannot be completely cleaned; the ambient temperature of the workshop is high, and the dampening cooling system does not work well, 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 it is carried by the inking roller to rotate, resulting in beating friction and extrusion.
The rubber roller is a roll-shaped product made of metal or other materials as the core and covered with rubber by vulcanization.
Post time: Feb-14-2022