Offset printing is a kind of lithographic printing, very simple to say that offset printing is to use rubber (blanket) to transmit the graphics and text on the printing plate to the substrate printing method, which is also the existence of blanket, this printing method is named. Blanket plays an irreplaceable role in printing, such as: it can make up for the unevenness of the surface of the substrate, make the ink fully transferred, it can reduce the transmission of water on the printing plate (see the role of water in printing) to the substrate and so on. The above is just a general concept, we usually say that offset printing may be narrower, that is, there are three cylinders (printing plate, blanket, embossing) lithography printing method, in the south of our country this printing method is called offset printing.