Printing is divided into three stages:

Pre-press→refers to the work in the early stage of printing, generally refers to photography, design, production, typesetting, output film proofing, etc.;

Printing in → refers to the work in the middle of printing, the process of printing the finished product through the printing machine;

Post-press→refers to the post-printing work, generally refers to the post-processing of printed matter, including glue (laminating), UV, oil, beer, bronzing, embossing, pasting, etc., which are mostly used for packaging printed matter.

Printing is a technology for copying the graphic information of the original manuscript. Its main feature is that it can reproduce the graphic information on the original manuscript on a variety of substrates in a large and economical manner. It can be said that the finished product is also It can be widely circulated and preserved, which cannot be compared with other copying technologies such as movies, television, and photography.

The production of printed matter generally has to go through five processes, including manuscript selection or design, original plate making, printing plate printing, printing, and post-press processing. That is to say, first select or design a manuscript suitable for printing, and then process the graphic information of the manuscript to produce an original plate for printing or engraving (usually called a positive or negative negative), and then use the original to make The printing plate for printing is finally installed on the printing press, and the ink is coated on the surface of the printing plate by the inking system. The ink is transferred from the printing plate to the substrate by the pressure machine, and a large number of copies are copied in this way. The printed sheet is processed after printing to become a finished product suitable for various purposes. Nowadays, people often refer to the design of manuscripts, image and text information processing, and plate making as pre-press processing, and the process of transferring the ink on the printing plate to the substrate is called printing. The completion of such a printed matter requires pre-press processing, Printing, post-press processing and other processes.