Process for rolling aluminium foils and aluminium foils obtained by said process

A process for rolling aluminum foils comprising the steps of:

• a) providing a first laminate (1) comprising two aluminum foils overlapped one to another between which a lubricant is interposed;
• b) providing a second laminate (2) comprising two aluminum foils overlapped one to another between which a lubricant is interposed;
• c) lubricating, at least partially, at least one face of at least one laminate between said first laminate (1) and said second laminate (2);
• d) coupling said first laminate (1) with said second laminate (2) thus obtaining a double laminate (3, 12) comprising four aluminum foils,
• wherein
• d′) said at least one lubricated face is a contact face between said first laminate (1) and said second laminate (2), some lubricant being interposed between each aluminum foil and an adjacent aluminum foil of said double laminate (3);
• or wherein
• d″) said at least one lubricated face is a non-contact face between said first laminate (1) and said second laminate (2), said double laminate (12) having at least one outer lubricated face, in this case being provided the further intermediate steps of
• d″′) winding, at least partially, said double laminate (12) having at least one outer lubricated face, thus obtaining an at least partially wound double laminate (13) comprising n coils;
• d″″) partially separating said at least partially wound double laminate (13) by unwinding, at least by one coil, both the aluminum foils of one of said first laminate and said second laminate, thereby obtaining an at least partially wound double laminate (18) comprising an end portion (19) constituted by a respective portion of both the aluminum foils of only one of said first laminate and said second laminate;
• d″″′) unwinding said at least partially wound double laminate (18) thus obtaining a double laminate in which some lubricant is interposed between each aluminum foil and an adjacent aluminum foil;
• e) rolling at least once said double laminate in which some lubricant is interposed between each aluminum foil and an adjacent aluminum foil, thus reducing the thickness of said double laminate;
• f) separating said double laminate with reduced thickness thus obtaining four aluminum foils with reduced thickness, wherein the two aluminum foils (4, 5;
• 14, 17) among said four aluminum foils each have both faces opaque, and the other two aluminum foils (6, 7;
• 15, 16) among said four aluminum foils each have an opaque face and a bright face.