Mold for a container blow molding machine, comprising a grooved mold bottom

Mold (1) for a blow molding machine for manufacturing containers (2) from parisons (3), said mold (1) comprising a lateral wall (4) and a mold bottom (7) together defining a cavity (8) for receiving a parison (3), said cavity (8) being generally symmetrical with respect to a main axis (10), said mold bottom (7) being provided with a gas conduit (12) opening into the cavity (8) for injecting into the same a pressurized gas in order to facilitate withdrawing of the blow molded container (2), wherein the mold (1) further comprises a groove (16) provided on an internal face (15) of the mold bottom (7), said groove (16) extending along a closed contour around the main axis (10), and wherein said conduit (12) opens into said groove (16).