The blanket is an intermediate carrier for indirect transfer of pictures and texts in the offset printing process. It is one of the main consumables for offset printing. Its quality directly affects the quality of the printed matter. Even a good quality blanket, if used improperly or stored poorly, will also affect the service life of the blanket. Therefore, increasing the service life of the blanket is equivalent to increasing its printing durability.

Offset blankets are made by stacking layers of cloth and rubber. Its function is to transfer the graphic ink transferred from the PS plate to the substrate, that is, to play a role of transfer between the printing plate and the substrate. Compared with the ordinary rubber cloth, the commonly used offset air cushion rubber cloth has a micro-bubble air cushion layer under the surface rubber layer in addition to the woven fabric bottom layer, the elastic rubber adhesive, and the surface rubber layer. This micro-bubble air cushion layer is formed by numerous tiny, closed spherical airbags dispersed in rubber. After the rubber layer on the surface of the air-cushion blanket is compressed, the air sphere shrinks its volume under the pressure, causing the blanket to compress vertically, avoiding the incompressibility of the ordinary blanket due to the volume of the rubber itself. A convex hull is formed around the edge, resulting in an increase in the amount of slippage between the rubber cylinder and the plate cylinder and between the rubber cylinder and the impression cylinder during imprinting, resulting in the expansion of the dots and the decrease in the accuracy of image and text transfer. With the development trend of high-speed offset printing equipment, most of the industry chooses air cushion rubber with a good compressibility and a thickness of 1.95mm.

After the offset blanket is installed and used, due to the multiple effects of installation tension, printing pressure, printing ink and cleaning agent, its static performance index and dynamic performance index will gradually change. If used improperly, the function of the blanket will quickly fail, and it will not work properly until less than a fraction of the theoretical life. Therefore, to improve the printing durability of the blanket is not only to make its service life closer to the theoretical life, to reduce the loss of the blanket, to improve the utilization of the blanket, to reduce production costs, but also to reduce printing process failures, ensure printing quality, and improve printing Productivity.

The main factors affecting the printing durability of blankets include improper selection of offset blankets, improper installation of blankets, improper adjustment of printing pressure, improper selection of inks, improper cleaning of blankets and improper storage of blankets. One of the main reasons is the improper selection of blankets, failure to choose truly high-quality blankets, so that the performance index of the blanket fails to meet the requirements of high-speed printing or the performance index in use drops rapidly, such as poor resilience, So that the blanket quickly fails. The second is that the adjustment of printing pressure is too large, which causes the pressure resistance of the blanket to decline sharply. Under the condition of high-speed alternating frequency of offset printing, the internal friction of the blanket increases, the stability of the printing pressure decreases, and the aging speed of the blanket increases. The printing durability decreased. The third is improper cleaning of the blanket, such as the mismatch between the cleaning agent and the blanket, excessive cleaning times, long cleaning time, and failure to wash the blanket, etc., which leaves the cleaning agent solvent and accelerates the chemical aging of the blanket.

Therefore, to improve the printing durability of offset blankets, we must first start with the selection of blankets suitable for printing presses, printing inks, printing materials, and printing processes. It should be clear that "there is no best blanket, only the most suitable blanket." Secondly, we must pay attention to the adjustment and control of printing pressure to avoid the excessive pressure caused by the slippage of the blanket, which exacerbates the wear and aging of the blanket and thermal aging. The printing pressure should be adjusted to the state where the ink can be smoothly transferred and the dot increase is minimal. Finally, the appropriate blanket cleaner should be selected to achieve rapid and thorough cleaning of the blanket, reduce solvent aging of the blanket, and extend the life of the blanket.

If you want to ensure that the blanket is always in good operating condition and get a high print resistance, companies should also pay attention to the maintenance and maintenance of the blanket. Although blankets are not the major consumables in printing, the consequences and impact of a drop in print durability are great. Because there are many factors affecting the printing durability of blankets, it is difficult to enumerate and give countermeasures one by one. It is also necessary for enterprises to continuously sum up experience and optimize the printing process in actual production.

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