Printability of metallic materials

The main body of metal printing is tinplate printing. However, due to low tin production and high prices, chrome-plated or tin-plated thin steel plates have been used in recent years. Decorative building materials are mainly galvanized iron plates. Aluminum materials are printed as thin plates, foils, stamping cans, and drawing cups.

Compared with other printing materials, metal is characterized by its smooth surface, hard texture, and wood-absorbing ink. Therefore, the printing ink must be a fast-drying or UV-curing photosensitive ink; at the same time, since the printed metal substrate needs to pass through Mechanical processing, but also required to dry the coating and ink film is strong enough; if you want to make food cans, you must pay particular attention to the high temperature and other factors in the sterilization. Therefore, the printing ink should have the same characteristics as ordinary offset printing; the ink film of the printing ink should not be discolored, discolored or yellowed after being heated and dried; it should have good solvent resistance and prevent bleeding when glazing; printed iron products Most of them need to be processed through stamping, punching, bending, and sealing. The ink film should have good adhesion, flexibility, surface hardness, and impact strength. As a daily product, printing ink should not be affected by light or climate change. And fading and aging and so on.

Since the metal material is not hygroscopic, the paint, the printing, and the glazing are all in a wet state, and therefore must be dried; and wet and wet multicolor printing cannot be performed, and only two-color printing can be performed on a screen with less overlap. If UV drying inks are used, multi-color printing can be performed using a four-color tin printing press. In iron offset printing, hard rubber erasers and hard liners should be used, otherwise the outlets will be poorly reproduced.