Metalloplastic strip for rigid food packaging and manufacturing method

Method for coating a substrate made of an aluminum alloy in the AA3000 or AA5000 series in an H19 or H39 metallurgical temper with a thickness of between 150 and 270 μm, comprising:

• a) coating by (co-)extrusion at a temperature between 250 and 280° C. of a polypropylene modified by maleic anhydride adhesion layer on each face of said aluminum alloy substrate, and a surface layer made of polypropylene comprising at least one slip agent covering at least one of said adhesion layers so as to form a metalloplastic strip;
• b) calendering of said metalloplastic strip to obtain a total thickness of the set of adhesion and surface layers being between 4 and 20 μm per face;
• c) heat treatment of said metalloplastic strip with a strip temperature comprised between 120 and 160° C.;
• d) cooling of the metalloplastic strip,
• to obtain an H48 metallurgical temper and a coefficient of friction of 0.06 or less.