Mold for blow molding a hot-fill container with increased stretch ratios

A mold (32) for blow molding a container (1) from a preform (16), said container (1) comprising a wall portion (5) and a base (7) including a high standing ring (8) and a central outwardly-inclined invertible diaphragm (9), said mold (32) comprising sidewalls (34A, 34B) forming a counter print of the wall portion (5) of the container (1) and a mold base (36) having an upper surface (37) defining a counter print of the container base (7), wherein the upper surface (37) includes:

• an annular peripheral face (43) corresponding to an annular support flange (12) of the container base (7),
• a frusto-conical outer face (44) corresponding to an inner portion (11) of the high standing ring (8), said outer face (44) protruding upwardly with a draft angle (A2) from an inner edge of the peripheral annular face (43) up to a sharp apex (45),
• a frusto-conical downwardly inclined inner face (46) corresponding to the invertible diaphragm (9),
• and wherein:
• the annular peripheral face (43) is in the shape of a frustum of a cone and shows an inward inclination in a transversal section,
• the peripheral face (43) defines, with respect of a plane (P) perpendicular to a mold base axis, an angle (A1) comprised between 1° and 10°, and
• the outer face (44) and the inner face (46) of the upper surface (37) together define at the apex (45) an angle (A3) comprised between 50° and 70°.