Offset printing machine is a kind of lithographic printing machine. When printing, the printed text and text are printed from the printing plate to the rubber cylinder, and then transferred to the paper by the rubber cylinder. Offset presses can be divided into sheet-fed offset presses and web offset presses according to the paper feeding method; according to the number of printing colors completed in a single pass, it can be divided into single-color, two-color, four-color, and multi-color presses; according to the printing The largest paper format can be divided into small offset presses, six-open, four-open, folio, and full-sheet presses. In addition, there is a double-sided press that can perform two-sided printing at the same time in one pass. Sheetfed offset presses are lithographic printing presses used to print high-end commercial prints and packaging prints, and are the mainstream of modern paper printing.
Offset presses can be divided into single-color, two-color, four-color, and multi-color presses based on the number of printing colors completed in a single pass. According to the maximum paper size, the offset press can be divided into small offset presses, six-open, four-open, folio, and full Sheet-fed printing presses, as well as double-sided printing presses that can perform two-sided printing at the same time. According to the dampening system, it can be divided into alcohol machines (ie, alcohol-based offset presses, waterwheels (ie, water-based offset presses), and waterless offset presses.