Aluminum foil can be divided into roll aluminum foil and sheet aluminum foil according to the shape. Most of the aluminum foil deep-processing wool is supplied in rolls, and sheet aluminum foil is only used in a few handicraft packaging occasions.
Aluminum foil can be divided into hard foil, semi-rigid foil and soft foil according to the state.
① Hard foil: Aluminum foil that has not been softened (annealed) after rolling, and if it has not been degreased, there will be residues on the surface. Therefore, the hard foil must be degreased before printing, laminating, and coating, and it can be used directly if it is used for forming.
② Semi-rigid foil: Aluminum foil whose hardness (or strength) is between hard foil and soft foil, usually used for forming processing.
③ Soft 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. Flexible foils are used in most application areas such as packaging, lamination, electrotechnical materials, etc.