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Have a certain degree of water resistance
Jul 30, 2018

(1) requires ink to have good adhesion and mechanical properties

Since tinplate prints are ultimately made into cans, toys, metal photo frames, and barrels and cans of chemical products, they need to be cut, bent, and stretched. Therefore, printing inks are required to have good adhesion to tinplate and corresponding machinery. performance. In order to improve the adhesion of the ink, it is first necessary to make a white base for the tinplate before printing. White is the primary color of all pictures and has a high brightness. After adding other high-energy hue, the hue of each hue can be improved to form a color gradation.

(2) Requirements for white ink

The surface of the tinplate is silver (or yellow) with metallic luster. Before printing the color graphic, the surface needs to be white or white, which is limited by the ink coverage. Monochrome machines often need to be printed twice, whiteness. Up to 75%. As an important indicator of the quality of tinplate printing products, whiteness requires white ink to have a good bonding force with the primer. After many times of high temperature baking, it does not yellow, and high temperature steaming does not change color. Priming the tinplate can increase the adhesion to the tinplate and have a good adhesion to the white ink. The commonly used primer is an epoxy amine type, which has a light color, is not yellowed, not aged after repeated baking, and has good flexibility and impact resistance.

(3) Requirements for color ink

Tinplate printed color inks, in addition to a certain degree of water resistance, also need to have their special requirements. Since the surface of the tinplate does not penetrate moisture and solvent, it needs to be baked and dried, so the ink should be heat-cured. The coloring power and durability of the pigment are required to be high. In addition to the basic performance of general offset printing ink, printing iron ink should also have the characteristics of heat resistance, strong adhesion of ink film, impact resistance, good hardness, resistance to cooking and light resistance according to the characteristics of printing iron.


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