Printing tfs tinplate ink is a special ink printed on tinplate and other metal sheets. It is mainly composed of pigments, binders, fillers and auxiliary agents. In addition to the printability of general offset printing inks,metal printing tinplate sheet inks should also have the following characteristics:
(1) Metal printing tinplate sheet ink has impact resistance and strong adhesion. In the post-printing process, metal materials such as tinplate must go through canning processes such as cutting, bending, impact, and seaming. Therefore, the printing tfs tinplate ink layer should have sufficient adhesion to make the printed tinplate sheet tin withstand the stamping of the mold. And printed tinplate sheet tin has excellent machining properties (including flexibility, surface hardness and impact strength, etc.). At the same time, the printing tfs tinplate ink layer is required to have good lipophilicity, so that it can be well combined with the varnish to ensure a certain adhesion between the tinplate and the ink layer and the varnish.
(2) Printing tfs tinplate ink is firm and hard. In the process of can making, the tinplate prints after printing and polishing will inevitably collide with each other, and the cut tinplate is very sharp, it is easy to damage the pattern on the metal surface and cause the ink layer to fall off, so the ink layer is required Firm and hard.
(3) Printing tfs tinplate ink has heat resistance. In the drying process, the printed tinplate sheet tin parts have to go through a certain temperature and time heating and drying process. Therefore, pigments and binders with strong heat resistance should be selected to prevent the ink from yellowing after heating.
(4) Printing tfs tinplate ink has solvent resistance. In order to make the appearance of metal prints beautiful, increase the hardness, and prevent damage caused by friction, polishing treatment is required. The glazing oil contains a large amount of strong solvents, and it is required that the dried ink layer does not change color, swell, or shrink.
(5) Printing tfs tinplate ink has light resistance. The metal tin container is required to un-change the color of the pattern under the sunlight and light.
(6) Printing tfs tinplate ink has retort resistance. Some metal cans need to be boiled for sterilization or heated before drinking. Therefore, it is required that the ink layer does not change color, stain, generate bubbles, and lose gloss after being steamed.