At present, the inks used in the printing of aluminum foil bags are mainly divided into two categories:1. The first type is alcohol-soluble polyamide ink. This type of ink can show various excellent properties when printing on aluminum foil, and its heat resistance can also meet the requirements of aluminum foil bag printing and use. It is the most widely used type of medical aluminum foil bag printing. However, this type of ink is not a special ink for aluminum foil surface printing after all. The problem is that the ink peeling phenomenon has occurred when printing on a large surface of aluminum foil.2. The second type is special ink for aluminum foil with ethylene, vinyl acetate copolymer resin and acrylic resin as the main components. This is a newly developed gravure printing ink, which is characterized by bright color, high concentration, strong adhesion to aluminum foil, good transparency, and excellent reproducibility of metallic luster of aluminum foil. However, since it is a gravure printing ink, its solvent has a high volatility, and when it is used for aluminum foil surface printing, it is easy to cause the ink in the gravure roller to dry and cause a smearing phenomenon, which affects the printing quality.
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