Common printing processes include offset printing (lithography) and gravure printing. The entire offset printing process is divided into the following steps: 1. Plate making 2. Printing 3. Multi-color printing 4. Baking and shaping Gravure printing engraves tiny grooves on the surface of the printing plate to hold the ink, and then transfers the ink to the tinplate surface by pressure.

The Mohs hardness of tin is about 1.5, which means that it is easily affected by external friction. During long-term use, the tin layer may become thinner due to wear or even fall off completely.

Equipment required for printing tinplate sheet: Lithographic printing press Offset printing press Screen printing press Flexographic printing press Post-printing processing equipment: Drying oven Laminating machine Cutting and punching equipment

The process of manufacturing aerosol cans is mainly divided into the following key steps: can body forming, nozzle and valve manufacturing, assembly and filling. These steps involve the combination of multiple manufacturing technologies and processes, which will be described in detail one by one below.

As mentioned above, the melting point of the tin layer is much lower than that of the steel. If the tinplate sheet is heated directly, the tin layer will melt before the steel substrate reaches the melting temperature, which will cause the tin layer to be lost and lose its anti-corrosion function.