Iron boxes can't be heated with open flame. Tin foil is a kind of metal foil with good thermal conductivity and reflectivity, which is often used to wrap food for baking or heating. However, due to the thin material of tin cartons, high-temperature barbecues are easy to deform, burn and catch fire, and cannot be directly heated on an open flame. Tin carton is an environmentally-friendly packaging material composed of aluminum foil and paper, which has the properties of heat preservation, moisture-proof, oxygen prevention and sound insulation, can effectively protect the goods in the package, can effectively extend the shelf life of the goods, has good luster and lubricity, and can improve the aesthetics and feel of the package. The manufacturing process of iron box is mainly divided into two steps, the composite molding of aluminum foil and paper.