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An arrangement for sterilizing a travelling material web comprises a chamber having an inlet and an outlet so that the material web can enter and exit the chamber. Constriction zones are arranged between the inlet and outlet and are connected to one another by an intermediate chamber portion. The co

An arrangement for sterilizing a travelling material web comprises a chamber having an inlet and an outlet so that the material web can enter and exit the chamber. Constriction zones are arranged between the inlet and outlet and are connected to one another by an intermediate chamber portion. The constriction zones are designed so that the web material is just able to pass freely between the constriction zones. The intermediate chamber portion is connected to a gas source while each of the constriction zones are connected to a vacuum source.

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Apparatus for gas-phase sterilizing a travelling material web comprising: an elongated chamber having an inlet at one end and an outlet at the opposite end, said inlet and outlet being aligned to allow a material web to extend along a predetermined path into the chamber through the inlet and out of

Apparatus for gas-phase sterilizing a travelling material web comprising: an elongated chamber having an inlet at one end and an outlet at the opposite end, said inlet and outlet being aligned to allow a material web to extend along a predetermined path into the chamber through the inlet and out of the chamber through the outlet, said chamber having interior walls spaced apart on opposite sides of said path, first conduit means for introducing a sterilizing gas into said chamber and second conduit means for withdrawing gas from said chamber, said first and second conduit means being spaced apart longitudinally of said chamber, said chamber including constriction means for accelerating the sterilizing gas along the path and for forcing the sterilizing gas to flow in close contact with the material web at very high speed as the gas flows from the first conduit means to the second conduit means to ensure that the sterilizing gas contacts and is uniformly distributed over the whole width of the material web so that effective sterilization of the entire material web takes place, said constriction means including a pair of plates extending outwardly from said interior walls toward said path, said plates being positioned between said first and second conduit means, and a heating device positioned in front of the inlet to the chamber so that the material web will be subjected to heat from the heating device prior to entering the chamber.