According to the shape, aluminum foil can be divided into roll aluminum foil and sheet aluminum foil. Most of the aluminum foil deep-processing wool materials are supplied in rolls, and sheet aluminum foil is only used on a few handicraft packaging occasions.
According to the state, aluminum foil can be divided into hard foil, semi-hard foil, and soft foil.
①Hard foil: The aluminum foil that has not been softened (geglüht) after rolling, without degreasing treatment, has residues on the surface. Deswegen, the hard foil must be degreased before printing, lamination, and coating, and it can be used directly if it is used for forming.
②Semi-hard foil: Aluminum foil whose hardness (or strength) is between hard foil and soft foil, usually used for forming.
③Soft foil: Aluminum foil that has been fully annealed and softened after rolling. The material is soft and there is no residual oil on the surface. Most of the current application areas, such as packaging, lamination, electrical materials, usw., use soft foils.