Why does aluminum foil have different sides?

Why does aluminum foil have different sides?

Aluminium foil has a shiny side and a matte side. The shiny side is produced when the aluminium is rolled during the final pass. It is difficult to produce rollers with a gap fine enough to cope with the foil gauge, therefore, for the final pass, two sheets are rolled at the same time, doubling the thickness of the gauge at entry to the rollers. When the sheets are later separated, the inside surface is dull, and the outside surface is shiny. This difference in the finish has led to the perception that favouring a side has an effect when cooking. While many believe (wrongly) that the different properties keep heat out when wrapped with the shiny finish facing out, and keep heat in with the shiny finish facing inwards, the actual difference is imperceptible without instrumentation. Increased reflectivity decreases both absorption and emission of radiation.aluminium  Foil may have a non-stick coating on only one side.

Aluminum foil has many characteristics, so it is vastly used as packaging aluminum foil, such as food, drink, cigarette, pharmaceutical, aluminum household foil, etc. Besides, it can also be used as electronic capacitor material, building material, heat insulation material, printing material, sign or label material and so on and so forth. Among all these applications, using as packaging material can greatly express the features of aluminum foil. haomei Aluminum foil can manufacture varieties of aluminum foil with high quality, and has won good praise from our customers