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In addition to a certain degree of water resistance, tinplate printing color inks also need their special requirements.

The coating on the inner surface of the can is to use a roller coater to print a suitable coating on the smooth surface of the tinplate into a uniform and controllable thickness before the tinplate is cut into a can body blank. The coating machine can independently carry out coating operations through its own feeding device, or it can be matched with the iron printing machine to form a printing coating line.