As an accessory in the ink supply system of an offset printing machine, the rubber roller usually has to contact the nylon ink roller and transfer ink well under a certain contact pressure, so the rubber roller must have good elasticity and minimal compression deformation. In addition, in terms of ink transferability, rubber rollers have different requirements for ink transfer from blankets, and rubber rollers require large ink absorption and low ink transfer rate. So that when the machine starts printing, the ink system can be uniform in a short time. Because the amount of ink adsorbed on the rubber roller is large, the ink transfer rate is low, but it can still transfer enough ink to the printing plate.