Engraving gravure and etching gravure processing
The engraving and gravure processing is the use of electric engraving machine, with different angles of the needle, the V-shaped groove with different depths is formed after striking on the copper-plated gravure cylinder, and then the wear-resistant chromium layer is plated on the surface of the gravure cylinder, after polishing Can be made on the printing plate. During the printing process, the V-shaped grooves are used to transfer the ink onto the printing material.
Corrosion gravure is the use of imaging technology, in the copper plating gravure cylinder surface image, after corrosion, the surface of the drum U-shaped groove, and then chrome plating and surface polishing.
Comparison of engraved gravure and etched gravure
There is no significant difference in the performance of engraving gravure and corrosive gravure, but the service life of the two is quite different.
After the V-groove on the surface of the engraving gravure is worn, the depth of the groove becomes shallow. As the width of the bottom of the V-shaped groove becomes narrower, the area of ​​the halftone dot becomes smaller, the ink amount of the groove gradually decreases, the ink color becomes shallow quickly, and the printing plate is scrapped. . Engraving gravure in the process of engraving if the depth control is not good, it will affect the quality of printing, too deep in the printing process is likely to cause ghosting; too shallow will affect the life of the printing plate.
The corrosion plate surface is a U-shaped groove. With the wear of the printing plate, the depth of the groove becomes shallow, but the area of ​​the dot is not changed, and the decrease of the ink amount is relatively slow, and there is no significant change in the printing color. Its long service life.