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In the past, pressure-damaged blankets were mainly repaired by immersing woven cotton soaked in benzene, and those that couldn't be repaired were replaced with new blankets. However, people often did not pay attention to the repair of white toner. In fact, while the rubber blanket's blanket was crushed, the cushioned white was also squeezed. White is in the middle of the roller lining. Although it is not directly squeezed, due to the force of the action, it will be compressed and deformed, and the thickness of the extruded white part will become thinner. Loosen the blanket of the roller and find it difficult to find the place to be pressed on the white. In this way, if a repaired blanket is used or a new blanket is replaced and the drum is re-linered, and the pad is still crush-wound with old white, the place where the white roller is squeezed after the blanket is wrapped will change thickness. Thin, new bag blankets still appear recessed at this location, resulting in unclear image transmission. In this case, in the past, more measures were taken to replace white instead of shimming. Because the padding method is difficult to accurately fill the depressed position of the extrusion, the padding layer is added to the place where the white pad is not pressed while filling the position of the depression. As a result, the total thickness of the blanket cylinder liner is increased, so that the blanket cylinder is still not flat.
However, squeezing the lining of the squeegee in the offset printing sometimes occurs. If the squeegee is replaced, the blanket and the white can be replaced. This will undoubtedly greatly increase the cost of the material. I was inspired by the fact that the old yarn that had been taken apart could be scalded and straightened by hot water, and I felt that it was still possible to recover after being deformed by extrusion.
White is a wool product. After consulting the relevant data, it is known that the wool has an elongation of 25% to 50%, elasticity, and a scaly structure on the epidermis. The main component is keratin (ie, animal fiber). And contains lanolin, ash and other impurities, and cold water does not work, with boiling water treatment, expansion from a short time. Based on this, after repeated trials, we found an effective way to repair the bruised white. The practice is to immerse the crushed bainite in hot water at about 70°C to 80°C, remove it after standing for 24 hours, and dry it with a spin dryer, but do not twist it by hand, and then hang it by hanging. Dry it. The method is: Using 3 to 4 clips, evenly divide the side of the white meridian and hang it on the rope. After drying, it can be used evenly. Remember that you must not use an iron to iron. Because of the uneven ironing, the degree of white heat is inconsistent. This can cause white uneven thickness and affect the flat clothing of the drum liner.
Offset blanket rubber blanket, the main material is blankets, white cloth and pad paper. Due to the high degree of automation in the modern offset printing system and the high printing efficiency, many papers used for relief printing in the past have also been used for offset printing. This has resulted in an increase in the compression rate of offset linings. Crushing lining is the most taboo thing in offset printing. It will not only affect the progress and quality of printing, loss and waste of materials, but also cause serious mechanical accidents.