Different printing materials have different requirements for ink.
Release time:
2024-11-07
Newsprint: The flexographic ink used for newsprint printing is a type of ink that is very thin, has low viscosity, and flows well. Its flowability depends on the speed of the printing machine. Its complete drying is achieved through absorption and penetration drying. Nowadays, news printing has been replaced by rotary offset printing instead of letterpress printing, and flexographic printing is also used in news printing, where water-based inks have been widely used in flexographic printing.
1. Newsprint: The flexographic ink used for newsprint printing is a very thin, low-viscosity ink with excellent fluidity, which depends on the speed of the printing machine. Its complete drying is achieved through absorption and penetration drying. Nowadays, news printing has been replaced by rotary offset printing, and flexographic printing is also used in news printing, where water-based inks have been widely used.
2. Uncoated paper: The quality of uncoated paper varies, and the inks used must meet the requirements of various papers. Typically, viscous inks are used for printing, but they are slightly thinner than those used for coated paper. The drying method relies on absorption and oxidation.
3. Cardboard: Cardboard is commonly used for making boxes, cartons, packaging for printed materials, and covers for hardcover books. In printing, the ink is required to have good fluidity, low viscosity, and to withstand mechanical forces such as collisions and ink rubbing during handling. All printing methods can be used on cardboard: flexographic or offset printing with oxidation drying, and gravure or flexographic printing with penetration and evaporation drying.
4. Coated paper and surface-treated paper: For flexographic and sheet-fed offset printing, the ink thickness used on coated paper should be thicker than that on uncoated paper, with slightly higher viscosity, and the final drying of the ink mainly relies on oxidation. When printing on coated paper with a rotary press, fast-drying inks are required, and inks that dry through oxidation are gradually being replaced by heat-set inks.
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