Abstract: A blanket cylinder cleaning apparatus includes a pressure pad for pressing a cleaning fabric against a rotating blanket cylinder in a printing press to wipe away unwanted matter such as residual ink on the peripheral surface of the blanket cylinder. The pressure pad is hollow and filled with gelatinous viscoelastic material to stably bring the cleaning fabric into adequate contact with the blanket cylinder to efficiently clean the blanket cylinder. The viscoelastic material is solated with heat and readily injected into the inside space of the pressure pad.

Abstract: A dry grouting agent comprises cement particles having baked on the surface thereof a coating including a water-soluble silicon resin and a surface active agent. The grouting agent is produced by preparing a liquid mixture including a water-soluble silicon resin, a surface active agent and an oily solvent, adding the liquid mixture to cement particles and uniformly kneading it therewith, heating the result to evaporate off the oily solvent and water and to bake onto the cement particles a coating layer containing the water-soluble silicon and the surface active agent, and cooling and pulverizing the resulting solid mass.