Because the gravure printing machine ink layer is thicker than the offset printing, after the one-colour printing is finished, the drying system must be used to quickly volatilize and dry the ink solvent on the print, so that the ink is fixed on the substrate. Each colour should be dried and the ink drying speed should match the printing speed.
The drying method of the gravure printing machine is generally hot air drying. This drying device comprises a hot air drying room composed of a heat generating device, a ventilating device, and an exhaust port, and the printed sheets are dried by passing through the hot air drying room. The drying speed is controlled by adjusting the air volume. With this drying device, the deformation of printed sheets is small, which is beneficial to guarantee the quality of printed products. Sheets are generally cooled by a chill roll after being dried by hot air.
Now the main heat sources for gravure printing machines are the following:
1. Through the heating of the heating tube to dry the process;
2. Through the high-temperature steam drying process;
3. The gravure printing machine through the coal-fired boiler drying process;
4. Drying process by burning diesel oil.