| 摘要 |
A unit for sterilizing a web ( 2 ) of packaging material on a machine ( 1 ) for packaging pourable food products, the unit having a bath ( 7 ) containing a sterilizing agent, in which the web ( 2 ) is fed continuously; a process chamber ( 8 ) connected to an outlet ( 12 ) of the bath ( 7 ), and housing drying means ( 17 ) for removing residual sterilizing agent from the web ( 2 ); an aseptic chamber ( 25 ) communicating with the process chamber ( 8 ) via an opening ( 27 ) for passage of the web ( 2 ), and in which the web ( 2 ) is folded and sealed longitudinally to form a tube ( 29 ) which is filled continuously with the product for packaging; and an air processing circuit ( 24 ) for controlling process conditions; the circuit ( 24 ) draws air from the process chamber ( 8 ) through an orifice ( 54 ), the opening of which is adjustable, during operation of the machine, by a shutter ( 55 ) to maintain a pressure value greater than a predetermined minimum value in the aseptic chamber ( 25 ).
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