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An aseptically operating packing machine comprises a processing track with tools for treating a packing sheet arranged in a sterile chamber partially open to the atmosphere. Heated sterile air is blown through a sterile air filter, and a mixing nozzle is arranged downstream directly behind the filte

An aseptically operating packing machine comprises a processing track with tools for treating a packing sheet arranged in a sterile chamber partially open to the atmosphere. Heated sterile air is blown through a sterile air filter, and a mixing nozzle is arranged downstream directly behind the filter within an ari channel terminating in the sterile chamber. The mixing nozzle is connected to a steam- and sterilizing agent-supply conduit and points downstream towards the sterile chamber. A tank in the sterilizing supply conduit holds the sterilizing agent under constant pressure, and a steam volume regulator is arranged in the steam supply conduit.

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An aseptically operating packing machine comprises a processing track with tools for treating a packing sheet arranged in a sterile chamber partially open to the atmosphere. Heated sterile air is blown through a sterile air filter, and a mixing nozzle is arranged downstream directly behind the filte

An aseptically operating packing machine comprises a processing track with tools for treating a packing sheet arranged in a sterile chamber partially open to the atmosphere. Heated sterile air is blown through a sterile air filter, and a mixing nozzle is arranged downstream directly behind the filter within an ari channel terminating in the sterile chamber. The mixing nozzle is connected to a steam- and sterilizing agent-supply conduit and points downstream towards the sterile chamber. A tank in the sterilizing supply conduit holds the sterilizing agent under constant pressure, and a steam volume regulator is arranged in the steam supply conduit. l piston capable of sliding in a sheath housed in the rear fitting zone of the boot and cooperating with an internal piston rod, in either direction, by means of the elastic return member, the piston rod being linked at its outward end to one of the ends of the cable. 3. A boot according to claim 2, wherein the elastic return member is constituted by a helical compression spring arranged concentrically between the inner bore of the piston and the piston rod and coming in support against an internal shoulder of the bore of the piston and against a collar of the piston rod. 4. A boot according to claim 1, wherein the other end of the cable, with a predetermined length, is linked to a projection of the lever so as to exert a traction thereon, causing its rotation about its journal axis. 5. A boot according to claim 4, further comprising at least one elastic unlocking member inserted between a surface of the projection of the lever, opposite the abutment zone of the upper and a fixed edge of the shell base, obtained at a lower level with respect to the projection, such that said spring is biased in compression during a traction on the cable, ensuring the locking of the upper and, conversely, in decompression during the unlocking, by exerting a return force on the lever associated with that of the decompression of the spring of the piston. 6. A boot according to claim 5, wherein the elastic unlocking member is a helical compression spring. 7. A boot according to claim 1, wherein the cable is of a "Bowden" type associated with a sheath. 8. A boot according to claim 1, wherein a "Bowden" cable is housed in a channel having a substantially corresponding cross-section, provided in an original thickness "e" of the wall of the shell base, in its median or lateral rear portion, and connecting the abutment zone to the fitting zone, one being located at a distance from the other.