The offset press is a lithographic press. The package prints are printed from the plate to the eraser drum and then transferred from the eraser to the paper. The offset printing machine can be divided into a single-page offset press and a web offset press according to different paper feeding methods;

The color saturation of packaging printing according to multiple paper feeding can be divided into solid color, two-color, four-color and multi-color four-color printing machines; according to the printing process, the larger paper width can be divided into small offset printing machines, six open and four open, Two-color and full-sheet four-color printing presses, in addition to the two-sided four-color printing press that can carry out double-sided packaging printing. The single-page offset press is a lithographic press that is used to package and print high-end commercial service promotional materials and packaging promotional materials. It is a popular fashion for paper-based packaging.

The color saturation of the offset printing of the offset printing machine can be divided into solid color, two-color, four-color and multi-color four-color printing machines. According to the larger paper width of the printing process, it can be divided into small offset printing machines, six open and four. Open, two-open and full-sheet four-color printing presses, in addition to the two-sided four-color printing press that can carry out double-sided packaging printing. According to the dampening system software, it can be divided into an offset printing machine for ethanol dampening, an offset printing machine for Essence and a waterless offset printing machine.

The basis of what can now be called a "general four-color press" is the four-color presses of the following "general package printing" methods:

(1) Offset printing machine. Paste printing ink, ink fountain ink, the vast majority of single-sheet packaging printing method, but also the wire rope reel, is the use of the basic principle of water and oil mutual exclusion packaging printing pattern lithography.

(2) Gravure printing machine. Liquid printing inks, ink tank inks, and roll-to-roll packaging printing are gravure printings that use the basic principles of similar intaglio stamps (not very precise, but more brand image).

(3) Flexo printing machine. Liquid printing ink, ink tank or closed scraper circulation system ink pump ink supply, roll-to-roll packaging printing, is this rigid letterpress printing using the basic principle of the similar Yang seal.

(4) Letterpress machine. Paste printing ink, ink fountain ink, roll-to-roll packaging printing, similar to flexo printing, but the printing plate is hard.

The overall structure of the equipment is similar, only the feeding module + several opinions packaging printing color group + preparation module. The main difference and the characteristics of each, then the classic story is long. I have to look at it on the spot and study it.

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