An offset printing machine is a type of lithographic printing machine. During printing, the printed images and text are printed from the printing plate to a rubber cylinder, and then transferred to the paper by the rubber cylinder.
According to the number of printing colors completed in one pass, it can be divided into single-color, two-color, and four-color printing machines; according to the largest paper format to be printed, it can be divided into small offset printing machines, six-fold, four-fold, folio and full-sheet printing machines. Sheet-fed offset printing machine is a lithographic printing machine, which is used to print high-end commercial printed matter and packaging printed matter, and is the mainstream of modern paper printing.