Generally speaking, the shelf life of canned food ranges from 1 to 5 years, and the role of tinplate cans is to protect the food from the influence of the external environment during this shelf life and maintain the flavor and safety of the food.

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.

According to the requirements of the pattern and the characteristics of the substrate, reasonably control the amount of ink to avoid too much or too little ink. By adjusting the ink transfer system, ensure that the ink is evenly transferred during the printing process to avoid uneven patterns.

The materials used to make candy tin cans vary, but the most common ones are the following: tinplate, plastic, glass, aluminum alloy, and paper materials. These materials have their own advantages and disadvantages and are suitable for candy packaging of different types and needs.