| 摘要 |
A unit (1, 1') for sterilizing a web (2) of packaging material for a machine for packaging pourable food products, the unit (1, 1') having a sterilizing chamber (3) containing a liquid sterilizing agent at a first temperature (T 1 ); conveying means (9a, 9b, 9c) for feeding the web (2) through the sterilizing chamber (3) before the web is formed into a succession of sealed packages of pourable food products; a hold tank (11) for the sterilizing agent; feed means (13, 15, 16, 12) activated selectively to feed the sterilizing agent from the tank (11) to the sterilizing chamber (3); drain means (12, 17, 18) activated selectively to drain the sterilizing agent from the sterilizing chamber (3) into the tank (11) in the event of stoppage of the packaging machine; and cooling means (55; 55') activated selectively, at the end of the package production cycle, to cool the sterilizing agent in the tank (11) to a second temperature (T 2 ) lower than the first temperature (T 1 ) . ( Figure 1 )
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