The tinplate printed will eventually be made into easy open food cans, toys, metal photo frames and barrels and cans of chemical products, which need to be cut, bent and stretched. Therefore, the printing ink is required to have good adhesion to tinplate and corresponding mechanical properties. In order to improve the adhesion of the printing ink, the tinplate needs to be white primed before printing. White is the base color of all pictures and has high brightness. After adding other high-energy hues, the brightness of each hue can be improved to form a gradation.
