Method of manufacturing textured-smooth hybrid metal closure caps

A method for manufacturing metal closure caps, comprising:

• a) the supply of a strip or sheet, made of aluminum alloy known to those skilled in the art as “textured” strip or sheet, typically coated on at least one of its faces, generally the face intended to be on the inside of the cap, by a coat of stampable lacquer,
• b) a first operation for cutting discs, called blanks,
• c) a step for stamping and cutting anisotropic horns, in one or more passes, of said blank metal, typically using a stamping lubricant, so as to form a stamped blank, comprising a head and a skirt, typically axially symmetric in the axial direction,
• d) a step for degreasing said stamped blank, typically intended to eliminate the remaining lubricant, to form a degreased blank that can possibly be lacquered,
• e) an optional step of protective lacquering and/or decoration,
• and characterized in that it comprises, after the stamping step, at least one drawing step consisting in passing the stamped blank through at least one drawing ring in order to stretch and thin the metal.