①Pure tin sheet coating materials can improve the adhesion between ink and tinplate. Since the oil film and oxide film on the surface of pure tin sheet directly affect the adhesion between the printing ink and the black tin sheet, when the ink is directly printed on the surface of the black tin sheet, its adhesion is low and cannot meet the requirements of post-press machining. After coating materials on pure tin sheet, the ink is firmly attached to the surface of the black tin sheet, which can meet various machining requirements such as deep drawing and pressing.
② Pure tin sheet coating materials have protective effect. The protective effect of the film layer on the inner and outer walls of the container mainly has the following three points: it can reduce the mechanical damage to the surface of the lacquered tinplate container; prevent the corrosion of the outer surface of the container by environmental media (water, air, etc.); The contents do not deteriorate for a long time.
③ Lacquered tinplate has decorative effect. pure tin sheet coating materials have various colors (such as gold lacquer, white coation, etc.) on the lacquered tinplate container can make its surface beautiful.