After plastic bowls have been filled with soup they are conveyed to a cleaning station. At this station downward needle-like jets of ambient air specifically conforming to the bowl flange surfaces blow contaminants off of the flanges and away from the containers, in either continuous or intermittent...http://www.google.es/patents/US5195294?utm_source=gb-gplus-sharePatente US5195294 - Container filling and sealing system
