Definition and classification of aluminum foil

Definition And Classification Of Aluminum Foil

2021.12.27

Aluminum foil refers to thin strips of aluminum and aluminum alloy with a thickness of ≤0.2mm. Its hot stamping effect is similar to that of pure silver foil, so it is also called fake silver foil. Because aluminum has a soft texture, good ductility, and silver-white luster, if the rolled sheet is mounted on offset paper with sodium silicate and other materials to make aluminum foil, it can also be printed. Aluminum foil is generally classified according to the thickness, state and purpose.

gold aluminum foil.jpg

According to thickness: aluminum foil larger than 0.012mm is called single foil, and aluminum foil less than or equal to 0.012mm is called double foil; there is also a single zero foil with a thickness after the decimal point and two zeros after the decimal point. Double zero foil.

According to the state: it can be divided into full hard foil, soft state foil, semi-rigid foil, 3/4 hard foil, 1/4 hard foil. Full-hard foil refers to the foil that has not been annealed after rolling (completely annealed coils and >75% cold-rolled); soft-state foil refers to the foil that has been completely annealed after cold rolling; where the tensile strength of aluminum foil is between that of full-hard The one between foil and soft foil is called semi-rigid foil; where the tensile strength is between full rigid foil and semi-rigid foil, it is 3/4 rigid foil; the tensile strength of aluminum foil is between soft foil and semi-rigid foil The one between the foils is called 1/4 hard foil.

According to the surface state: it can be divided into single-sided light foil and double-sided light foil. Aluminum foil rolling is divided into single rolling and double rolling. During single rolling, both sides of the foil are in contact with the roll surface, and both sides have bright metallic luster, which is called double-sided smooth foil. During double rolling, only one side of each foil is in contact with the roll, and the side in contact with the roll is bright, and the two sides in contact with each other between the aluminum foils are dark. This kind of foil is called a single-sided smooth foil. The minimum thickness of double-sided aluminum foil mainly depends on the diameter of the work roll, usually not less than 0.01mm, the thickness of single-sided aluminum foil is usually not greater than 0.03mm, and the current minimum thickness can reach 0.004mm.

According to the purpose of aluminum foil: it can be divided into packaging aluminum foil, air conditioning aluminum foil, electronic aluminum foil and battery aluminum foil, etc.