molding device comprising a one-piece mold base including a heat exchange cavity marrying a molding surface

Bottom (7) of block mold for a mold (1) for manufacturing containers, this base (7) comprising a mold wall (8) having a molding surface (9) in relief molding the footprint of at least a portion of a container bottom, this bottom (7) comprising a cavity (27) included in the bottom (7) of the mold, delimited by a casing (29) surface integrally defined by the base (7) mold and including a surface (31) internal of the wall (8) of molding, opposite to the surface (9) for molding and conforming to the relief thereof, and a surface (32, 33) rear facing surface (31) internally, the bottom (7) of the mold being provided with at least one pair of openings (35; 37) opening into the cavity (27) for the circulation therein of a cooling fluid.