Aluminum foil can be classified by the State of rigid foil and soft, semi-rigid foil foil.
① hard foils: after rolling without softening treatment (annealing) of aluminum foil without a degreasing process, BU there is a residual-Shan on the surface. Rigid foil printing, laminating, coating must be degreased before, if used for machining can be used directly.
② semi-rigid foil: the hardness of aluminum foil (or intensity) in between soft and rigid foil foil, aluminum foil, usually for processing.
③ soft foils: fully annealed soft aluminum foil after rolling, soft, no oil residue on the surface. In most applications, such as packaging, bonding, electrical material, soft foils are used.