The gravure printing machine is one of the four printing methods. It is a direct printing method. It directly imprints the ink contained in the gravure pit onto the substrate. The shade of the printed image is concave. The size and depth of the pit are determined. If the pit is deeper, the ink contained is more, and the ink layer left on the substrate after the imprinting is thicker. On the contrary, if the pit is shallower, the amount of ink contained is higher. Less, the ink layer left on the substrate after imprinting is thinner.
The gravure printing machine has an extremely important position in the fields of printing and packaging and graphic publishing because of its thick ink layer, bright color, high saturation, high printing durability, stable printing quality and fast printing speed.
From the application point of view, in foreign countries, gravure printing is mainly used for fine publications such as magazines and product catalogs, packaging printing, printing of valuable securities such as banknotes and stamps, and also in special fields such as decorative materials.
The gravure printing plate is composed of a pit corresponding to the original image and the surface of the printing plate. During printing, the ink is filled into the pits, the ink on the surface of the printing plate is scraped off with a doctor blade, and there is a certain pressure contact between the printing plate and the substrate, and the ink in the pit is transferred to the substrate to complete the printing.
With the development of domestic gravure printing technology, gravure printing machines have also been widely used in paper packaging, wood grain decoration, leather materials, and pharmaceutical packaging. Of course, gravure printing also has limitations. The main disadvantages are: pre-press plate making technology is complicated, the cycle is long, and the plate making cost is high. Due to the use of volatile solvents, the harmful gas content in the workshop is high, which is harmful to workers' health; gravure printing The treatment required by practitioners is relatively high.
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