Installation for the manufacture of containers from a preform and method of controlling the blow-molding means of such an installation

A method of controlling an installation (10) for manufacturing containers (12) or bottles, by blow-molding or by stretch-blow-molding, comprising:

• a normal operating mode in a presence of a perform (14) in a mold (46), the normal operating mode including at least one first step of, the mold (46) being in a closed position, vertical lowering of at least one blow-molding or stretch-blow-molding nozzle (56) toward a bottom position;
• and
• a special operating mode in an absence of the preform (14) in the mold (46), with the mold (46) being in a closed position, vertical lowering of the at least one nozzle (56) toward the bottom position so that, whether the installation (10) is operating or stopped, communication between an interior volume (96) of the mold (46) and an exterior environment is interrupted and the interior volume (96) of the mold (46) is isolated from the exterior environment to prevent the risk of airborne particle contamination,
• wherein the installation (10) includes at least one molding unit (42) equipped with a control device (55) adapted to control movement of the at least one nozzle (56) which is associated with the mold (46), in which the at least one nozzle (56) is mounted to be mobile vertically between a top position and a bottom position in which, the mold (46) being in a closed position, the at least one nozzle (56) caps at least one orifice (88) for the neck of the preform (14) that includes a top horizontal wall (90) of the mold (46).