How to extend the life of the blanket
The structure of the offset blanket is designed according to the overall distance of the printing press cylinder spacing, the blanket thickness of the blanket cylinder, and considering the requirements of printing technology. The thickness of the surface adhesive is generally 0.6mm to 0.7mm. If it is too thin, the elasticity is biased. Low hardness and high hardness will wear the printing plate, reduce the printing durability of the printing plate, and will make the dots not full. The screen will be mottled (that is, the screen header) and the depth of black will be different; too thick surface glue will make the printed matter The dot deformation causes the imprint to move, the overprint is not accurate, and the picture is blurred. Offset blankets are different from ordinary rubber products. They are responsible for transferring the ink from the printing plate to the paper. In order to make the ink color of the printed matter uniform, the dots clear, and rich in layers, the offset blanket must have the characteristics of moderate hardness, small compression deformation, good ink transfer performance and low elongation. In terms of chemical properties, it must have both ink absorption and fountain solution absorption The function must have the performance of not having chemical reaction with oil and potion and being eroded by oil and potion. Because it is lithographic printing, the flatness of the blanket is very high.
In an ideal situation, the blanket only serves to transfer the image, and the change in the radius of the blanket will not affect the size of the image, but in fact, due to the deformation of the blanket during imprinting, it is easy to cause overprinting. When we change the blanket, we often put a flat offset paper under the blanket, in order to make the blanket fully contact with the printing plate, but it should be noted that the tension of the blanket of each unit of the multi-color machine should be the same. When padding white paper, the thickness of the pad should be the same. The radius ratio of the roller should be reasonably configured. Try to keep synchronous rolling. Choose a blanket with a small circumferential elongation and pay attention to the direction of the blanket to ensure that the warp and The roller axis is parallel. In the usual printing process, due to the improper operation of the operator, or the inclusion of foreign objects in the paper, there is often a phenomenon of ruining the rubber blanket. The domestic price of a blanket is at least several hundred yuan, and the imported price is even more expensive. A full-open blanket is nearly a thousand yuan, so every time a blanket is broken, it will greatly increase production costs. Prolonging the service life of the blanket will appropriately reduce the production cost. In production, start with stacking the paper, shake the paper sufficiently to prevent foreign objects from being trapped in the white paper. During the paper feeding process, double or multiple sheets should be prevented. If there are double sheets, stop the paper in time and remove the paper , After printing, wipe the blanket in time to restore the original appearance and maintain flexibility. This will greatly extend the life of the blanket. Not only save costs, but also successfully complete the production tasks.
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