Method for manufacturing by stretch blow molding of a container at high stretching speed

Method for manufacturing a container (2) by stretch blow molding starting from a preform (3) made of plastic material within a forming unit (7) that comprises:

• A mold (8) that is provided with a side wall (11) and a mold bottom (13) having the impression, jointly, of the container (2), and
• A stretching rod (17) that is mounted to move in translation in relation to the mold (8) between an upper position in which the rod (17) is separated from the mold bottom (13) and a lower position in which the rod (17) is adjacent to the mold bottom (13),
• with this method comprising:
• A pre-blow-molding phase during which a fluid at a so-called pre-blow-molding pressure (PP) is injected into the preform (3), and the rod (17) is moved from its upper position to its lower position;
• A blow-molding phase during which a fluid at a so-called blow-molding pressure (PS), higher than the pre-blow-molding pressure (PP), is injected into the preform (3);
• wherein:
• The maximum travel speed of the rod (17) during the pre-blow-molding phase is greater than or equal to 2.5 m/s;
• The blow-molding pressure (PS) is less than or equal to 20 bar.