Aluminum foil is a kind of aluminum rolled material. Aluminum foil is mainly about thickness. In the industry, aluminum products with a thickness less than 0.2mm are usually called aluminum foil. The edges are usually cut vertically and delivered in rolls. Aluminum foil is a soft metal film. It not only has the advantages of moisture-proof, air-tight, light-shielding, abrasion resistance, fragrance retention, non-toxic and tasteless, but also because of its elegant silver-white luster, it is easy to process beautiful patterns and colors of various colors. pattern.
Aluminum foil has the following advantages in food packaging: barrier properties. Aluminum foil has excellent barrier properties against water, air (oxygen), light, and microorganisms. They are all important factors in food deterioration, so aluminum foil has a good protective function for food. Easy to process. Aluminum has a low melting point, good heat sealability, and is easy to form and can be processed into any shape according to the mold. The processed aluminum foil has excellent ductility and can be used to cover food of different shapes. It is also easy to carry out surface treatment, such as embossing process, which can make the aluminum foil more beautiful and promote consumption. Thermal conductivity. Aluminum is an excellent thermal conductor and can transfer heat quickly and evenly. It can be placed in ovens, grills, and refrigerators together with food. Light weight. The extremely small thickness of the aluminum foil allows it to achieve protective functions while minimizing the weight of the product. Lightweight packaging can reduce transportation costs and increase convenience of use. Environmental sustainability. Aluminum is the most abundant metallic element in the earth's crust, the third most common material, and comes from a wide range of sources. Aluminum foil has certain corrosion resistance, stable chemical properties, and long packaging life. It can be recycled and reused, and its recycling procedure consumes only 5% of the energy of original production, making it an economical and sustainable choice. Regarding aluminum foil selection, aluminum foils of different thicknesses are suitable for the following categories of food: 10-12 µm is suitable for chocolate, candies, etc. 30-38 µm is suitable for the dairy industry, such as pudding, yogurt, etc. 50-70 µm is suitable for jams, meat products, etc. It should be noted that aluminum foil is not suitable for packaging highly acidic or salty foods, such as foods containing vinegar or fruit acid, sauerkraut, rhubarb, salted fish, etc. A chemical reaction may occur causing aluminum ions to enter the food.
