When the hot melt in the valve area cools, the container is again perfectly sealed.
Companies in this article
Alcan Packaging: Vented lid system
Lawson Mardon (Zurich, Switzerland) has introduced Cavaflex, a vented lid system that incorporates a heat-sensitive "valve." A sealed jar can be processed in the oven because the valve allows gases to excape.
Jul 31, 1999
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