Aluminum foil according to the state can be divided into hard foil, semi-hard foil and soft foil.
1.Hard foil: after rolling without softening (annealing) of the aluminum foil, without degreasing treatment, the surface of the cloth is poor. So hard foil in the printing, bonding, coating must be degreasing before treatment, if used for forming can be used directly.
2.Semi-hard foil: aluminum foil hardness (or strength) between the rigid foil and soft foil foil, usually used for forming processing.
3.Soft foil: after rolling through the full annealing and soften the aluminum foil, soft material, the surface without residual oil. Most applications, such as packaging, composite, electrical materials, etc., use soft foil.