Air compressors are also widely used in printing and newspaper factories. Compressed air is used for cleaning the machines, lifting lead plate, operating steam work table and automatic type casting machines. The compressed air can prevent moist label from pollution and new printed paper from dust. In rotogravure printing workshop, the air compressor is used for pulling system of brake, printing machine and folding machine, for example, pneumatized clam make the wrapping up and binding more easily, the strap the finished prints automatically, suction cups help to charge the printing machine. A gentle air blasting may turn and separate the papers quickly. Spurting out of ink is finished by the pneumatic extrusion pump for several printing machines.