Ink is the most important material of printing, it make the pictures and words on the things through printing and jet drawing. The ink consists of major and auxiliary components, which are evenly mixed and rolled repeatedly to form a viscous, gelatinous fluid. It consists of binder (resin), pigments, fillers, additives and solvents.
Classification of ink : The modern ink classify into 4 models by type version.
- Relief printing ink. A type of printing ink used for printing books and periodicals, newspapers, pictures, documents, books, etc.. The main feature of the relief printings ink is the layout of printing ink part protrudes from the non inking part. Relief printing also classify to stereotype ink, copperplate ink, rotary letterpress ink, flexible letterpress ink.
- Planographic printing ink: It is one of ink suitable for lithographic printing. Each part of lithographic printing plate is basically in one plane. The patterns are oleophylic and non-patterns are hydrophilic .. By using the principle of water repellent printing, the lithographic ink must have water resistance. According to the process classify into offset printing ink, web offset printing ink, offset ink, waterless offset ink, printing ink, printing ink, ink collotype.
- intaglio ink: A type of inks suitable for gravure printing. In printing, the ink is indented or scratched on the part of the drawing line that is recessed into the layout, and then printed. There is a distinction between intaglio ink and gravure ink
- mesh printing ink.: A kind of ink through the mesh screen printing plate to substrate surface. Screen printing ink is divided into Stencil Ink and screen printing ink
The ink has different properties depending on the material used. Mainly resin inks, solvent inks, water-based inks and UV curing inks. It use of organic solvents as an ink binder has a negative impact on the environment. In order to make the printing ink accord with the environmental protection requirement, the environmental protection material should be used as the bonding material of the ink. Environmental protection ink mainly has water ink, UV ink, water UV ink and some alcohol soluble ink.
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