Modern inks are mainly divided into four categories according to the version
1. Letterpress ink: a type of ink used to print books, newspapers, picture albums, documents, account books, etc. The main feature of letterpress printing is that the inked part of the printing plate protrudes from the non-inked part. Letterpress inks are divided into lead printing inks, copperplate inks, letterpress rotary inks, and flexographic letterpress inks according to the type of printing machine and the use of printed products.
2. Lithographic ink: a type of ink suitable for lithographic printing. Each part of the lithographic layout is basically in a plane, the pattern is lipophilic, and the non-pattern is hydrophilic. The principle of oil and water repulsion is used for printing, so the lithographic ink must have water resistance. According to the process, it is divided into offset printing ink, web offset printing ink, flat offset printing ink, waterless offset printing ink, iron printing ink, lithographic ink, and collo printing ink.
3. Gravure ink: a type of ink suitable for gravure printing. When printing, the pattern part concave in the layout is inked, and the ink on the non-pattern part is wiped off or scraped off, and then the printing is carried out. There are engraving gravure inks and photogravure inks.
