A process for manufacturing a strip of aluminum alloy having high surface homogeneity
with an upper side showing after a 1 m thick sulphur anodic treatment, an
optical roughness value SN measured on three 5 cm longitudinal sections
and three 5 cm transverse sections, such that its mean variation on each section,
defined by the ratio: (Maximum SN-minimum SN)/Mean SN
is less than 20%, and the difference SN=SN max
-SN min is less than 20. The strip is manufactured by continuous casting
between two cooled rolls from a casting tank containing the liquid metal connected
to an injector, and feeding the liquid metal into the gap between the two rolls.
The injector has an upper lip recessed by at least 2 mm with reference to a lower
lip of the injector.