Abstract: An air curtain (14) is used to dynamically separate a zone (10) to be protected and a contaminating zone (12) communicating with each other through at least one separation zone (11), the air curtain being formed by simultaneously injecting at least two adjacent clean air jets into the same direction in the separation zone (11). More precisely, the air curtain (14) comprises a slow jet, in which the tongue (16) covers the entire separation zone (11) and a fast jet inserted between the slow jet and the zone (10) to be protected and for which the injection flow is such that it induces an air flow equal to approximately half the injection flow of the slow jet, on its surface in contact with the slow jet. Preferably, clean ventilation air is also injected into the zone (10) to be protected at a flow equal to at least the air flow induced by the surface of the air curtain in contact with the ventilation air, and in any case at a speed not less than 0.1 m/s.

Abstract: A device for dynamically separating two zones by a bufer zone and two clean air curtains. When transferring objects at high speed between two zones, a buffer zone which is connected to the two zones, forms a dynamic lock in order to separate them. a dynamic confinement system placed between each pair of adjacent communication zones forms an air curtain including two or three clean air jets. The buffer zone includes a blower ceiling and an intake grill facing it.

Abstract: Process and installation for the ultraclean continuous transportation of erial from a point P to a point P' within a bacteriologically controlled zone by a conveyor. The conveyor is continuously covered from upstream of point P with respect to the direction of travel of the conveyor, to downstream of point P', with a solid covering whose surface adapted to come into contact with the material is sterile. The material is deposited at point P on the covering, and the transported material is removed from contact with the solid covering at point P'. The path of the material is enclosed at least between points P and P', and a bacteria-free atmosphere is established in this enclosed path.