Valve for packaging, especially for food requiring heating, includes sealed opening part which opens under pressure and vibrates to generate noise as contents flow out

摘要

u An adhesive layer is located above a first opening part of the packaging and designed to be come at least partially detached from the packaging when an overpressure is generated in this part, allowing the contents to flow out via the resulting opening. The outgoing flow generates a noise by causing the opening part to vibrate. At least one second opening part is designed to open earlier than the first opening part during heating of the contents.