| 摘要 |
The present invention is concerned with aseptically operating packing machines and with a process for the pre-sterilization thereof. For jointly spraying steam and sterilizing agent at a single point into a sterile air supply channel which terminates in the sterile chamber of the packing machine, a mixing nozzle is arranged in the air supply channel directly downstream behind a sterile air filter. For pre-sterilizing purposes the treatment tools possibly still in hot condition and contained in the sterile chamber, prior to commencement of the pre-sterilizing process, are brought to a temperature below 120° C. The mixture of water vapor and sterilizing agent is effectuated by means of the mixing nozzle to which both components are supplied. The steam supply to the nozzle is effectuated by a pressure relief valve followed by a regulation of the steam volume, while the supply of sterilizing agent to the nozzle is effectuated from a stock of sterilizing agent held at a constant pressure. During the start-up phase of the pre-sterilizing process the sterile air supply for the purpose of a partial return flow generation of the discharged mixture of water vapor/sterilizing agent upstream toward the sterile air filter is discontinued temporarily.
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