Box used as e.g. packaging for foods, contains air hole with sound generating device

摘要

The box contains an air hole (I) for letting air in and out, which is connected to the box internal volume and includes a sound generating device (V, VI) which can be a mechanical, physical and/or electrical one. The sound generating device can be a tongue or at least one gap which generates e.g. a kettle whistling noise as air flows into or out of the packaging due to a pressure difference.