Besides recrystallising the grain structure of the foil and removing the rolling oil as far as
possible, the main tasks of annealing are to produce a surface which is not only even,
homogeneous and resistant but also displays good wettability and adhesion properties. Good
unwinding properties must also be maintained, meaning that any uncontrolled oxide growth on
the surface, which could lead tothe foil sticking together during unwinding, has to be avoided.