Aluminum foil can be divided into roll aluminum foil and sheet aluminum foil according to its shape. Aluminum foil deep processing wool is mostly supplied in roll form, and sheet aluminum foil is only used in a few handicraft packaging situations.
Aluminum foil can be divided into hard foil, semi-hard foil and soft foil according to the state.
① Hard foil: Aluminum foil that has not been softened (annealed) after rolling and has no residue on the surface without degreasing. Therefore, rigid foil must be degreased before printing, lamination, and coating. If it is used for forming processing, it can be used directly.
② Semi-hard foil: Aluminum foil whose hardness (or strength) is between hard foil and soft foil, usually used for forming processing.
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. Currently, most application fields, such as packaging, composites, electrical materials, etc., use soft foils.
