INTEGRATED ONE WAY VALVE WITH POLYOL FILM

摘要

A one-way valve 10 integrated into a lamination 12 of the kind used as a membrane seal for coffee containers and the like. The valve 10 comprises a top layer 14, a substrate 16 and a fluid polyol film 22. The top layer 14 and the substrate 16 are adhered together by an adhesive 18 disposed between the top layer 14 and the substrate 16. The adhesive 18 defines a boundary of a valve chamber 20 in which the top layer 14 and the substrate 16 are not permanently adhered to each other. The film 22 enhances the adhesiveness of the top layer 14 to the substrate 16 in the area of the valve chamber 20 so that gas inside the container does not escape until the internal pressure reaches a minimum value.