In addition to a certain degree of water resistance, the color ink printed on custom square tin box tinplate also needs to have its special requirements. Since the tinplate surface of the custom square tin box is impermeable to moisture and solvent, it needs to be baked and dried, so the ink should be heat-curable.

There are two main requirements for the coating in the printing of custom square tin boxes: (1) The ink is required to have good adhesion and mechanical properties. Since the printed matter of the custom square tin box will eventually be made into food cans, toys, metal photo frames and barrels, and cans of chemical products, it needs to be cut, bent, and stretched, so the printing ink is required to have good adhesion to tinplate. and the corresponding mechanical properties.

Coating. The coating of the custom square tin boxes plays a pivotal role in metal printing. It can be said that without coating, it is difficult to have metal printing (especially for metal lithography). The metal flat printing of custom square tin boxes is not the final purpose, but the beautification means of metal packaging products, the purpose is to make all kinds of metal containers, such as tin cans, cosmetic cans, various types of bottle caps, toys, etc.

1. Good sealing. The barrier properties of packaging containers such as custom square tin boxes to air and other volatile gases are very important for the preservation of nutritional content and sensory quality. The comparison of various juice packaging containers proves that the oxygen transmission rate of the custom square tin box container directly affects the browning of the juice and the preservation of vitamin C; the metal cans, glass bottles, and aluminum foil glued layers and carton boxes with low oxygen transmission rate are not suitable for Vitamin C is better preserved, and iron cans are the best.