Metal packaging containers refer to thin-walled packaging containers made of metal sheets. It is widely used in food packaging, pharmaceutical packaging, daily necessities packaging, instrument packaging, industrial product packaging, and ammunition packaging. Among them, the number used for food packaging is huge.
The main metal packaging can products include tinplate metal packaging cans, two-piece beverage cans, three-piece beverage cans, milk powder cans, ordinary food cans, aerosol cans, crown caps, twist-off caps, aluminum can lids, miscellaneous cans, chemical cans, and steel barrels above 200 liters. The materials used for metal packaging cans are mostly steel and aluminum, among which steel is mainly low-carbon thin steel plates, tinplate (common name for electroplated tin thin steel plates), Wuxi steel plates (chrome-plated thin steel plates), tinplate (galvanized thin steel plates), coated steel plates, and coated iron; aluminum materials include aluminum plates, aluminum foils, and aluminum-plated films.
The water vapor permeability of metals is very low, and they are completely opaque, which can effectively avoid the harmful effects of ultraviolet rays. Its gas barrier, moisture resistance, light blocking and fragrance retention properties far exceed those of other types of packaging materials such as plastic and paper. Therefore, metal packaging can maintain the quality of goods for a long time.
With the improvement of people's living standards, food safety issues have received widespread attention. The migration of harmful substances in metal packaging cans has now become an important part of food safety hazards. Problems such as the residue of harmful substances such as heavy metals, organic volatiles and solvents and microbial contamination are common in the ink printing process. In addition, bisphenol A is absolutely not allowed in the food packaging industry. Therefore, in the future canning industry, the safety of packaging materials will also become a focus of consumers.
