Food safety risks and prevention and control technologies of aluminum packaging materials

Aluminum foil accounts for over 60% of food packaging, but its metal ion migration issue has attracted attention. The EU EC/10/2011 standard stipulates that the migration limit of aluminum is 5mg/kg (simulated liquid pH ≥ 4.5), while the migration amount of aluminum in acidic foods (such as tomato sauce) can reach 8.2mg/kg. Prevention and control technology focuses on surface modification: when the thickness of the anodic oxide film increases to 20 μ m, the migration amount of aluminum decreases to 0.3mg/kg; The nano SiO ₂ coating can further reduce the migration amount to 0.05mg/kg. In addition, the new A3003 aluminum alloy forms Al Fe intermetallic compounds by adding 0.1% Fe element, which inhibits grain boundary corrosion and extends the shelf life to 36 months.