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The coating on the inner surface of the tinplate 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.

Tinplate is the common name for electroplated tin sheet steel, the English abbreviation is SPTE, which refers to cold-rolled low-carbon thin steel sheet or steel strip plated with commercial pure tin on both sides. Tin mainly plays a role in preventing corrosion and rust. It combines the strength and formability of steel with the corrosion resistance, solderability and beautiful appearance of tin in a single material. It has the characteristics of corrosion resistance, non-toxicity, high strength and good ductility.

Tinplate tea can printing has special requirements for inks,especial for the white printing ink for the tea can and food can,tinplate tea can printing ink has good adhesion and corresponding mechanical functions.