The offset printing machine can be divided into monochrome, two-color, four-color and multi-color printing presses according to the number of printing colors completed by one paper feeding. It can be divided into small offset printing presses, six open, four open, half open and full sheet paper printing presses according to the maximum paper size of the printer. In addition, there is a double-sided printing press that can complete two side printing at the same time by one paper feeding. According to the fountain system, it can be divided into alcohol machine (i.e., alcohol fountain offset press, water wheel (i.e., water fountain offset press) and water free offset press.

The sheet fed offset press is a lithographic printing machine, which is used to print high-grade commercial prints and packaging prints. It is the mainstream of modern paper printing. Due to its strong corrosivity, UV offset printing ink may cause ordinary printing ink rollers and blanket to expand, affecting the stability of printing pressure. In serious cases, it may also cause peeling or surface fragmentation. Therefore, UV offset printing has very high requirements for cots and blanket. The selection of ink rollers and blanket must be compatible with UV offset printing ink.