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Aluminium Foil Used For Food Packaging
There are many kinds of materials that can be used for food packaging bags, including various functional plastics, paper, aluminum, and so on. Many people find it strange, why can aluminum be used as a material for food packaging bags? What are the characteristics of food packaging bags made of aluminum?
Aluminum foil for food packaging is usually composited with other materials. As for why it is used in this way, there are two main reasons:
First, the composite process requires that the composite substrate must be in the form of a sheet, while the metal aluminum can be easily processed into a thin sheet due to its low hardness and good ductility. The commonly used aluminum foil thickness is 0.005 mm to 0.009 mm.
Second, the nature of aluminum is very active, and it is easily oxidized by oxygen in the air, forming a dense oxide Al2O3 protective film on the metal surface. Al2O3 is extremely stable in the air environment and can prevent oxygen from continuing to oxidize metal aluminum. Of course, food aluminum foil packaging bags made of aluminum foil use this dense protective film to well isolate outside air from entering the inside of the bag, and play a role in preventing food from being oxidized and deteriorated.
Aluminum foil products are not allowed to be stored in the open air. They should be stored in the warehouse. The floor in the warehouse should be flat, clean, dry, well ventilated, the room temperature should be 16-35℃, and the relative humidity should be below 70%. Aluminum foil products should not be stored together with active chemical products such as acid and alkali and items with high humidity.
When transporting people from low temperature areas to areas with high temperature and high humidity, do not open the package or store in an emergency. It is best to store them in a dry place for a certain period of time, and wait for the temperature of the aluminum foil product to rise.
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