Filtered venting system for liquid containers which are suscepti

Details Filtered venting system for liquid containers which are suscepti Filtered venting system for liquid containers which are suscepti

1999-01-25

2000-06-13

Kashnikow, Andres

Dispensing

With filter

Associated with vent passage

22215306, 137 6811, B67D 558

Patent

active

06073812&

ABSTRACT:
A multi-layer film (22) covers an aperture (21) in a rigid container (10) to provide a filtered venting system (C) for the container. The film includes a porous filter layer (36,36') of a material such as polytetrafluoroethylene foam which filters bioburden from air as it enters the container during the dispensing of a fluid from a nozzle (14) in the container. The film also includes a barrier layer (34,34') of an impermeable material that prevents air from entering the container during transit and storage and prevents blockage of the porous layer with dried fluid. Before dispensing, the film is stretched, thereby destroying the integrity of the barrier layer and allowing air to enter through the porous layer.

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