| 摘要 |
An insert (1) for positioning in a container of beverage such as beer which is to be sealed under pressure. In use, the insert is filled with gas and/or beverage which is released from the insert in order to generate foam in the beverage when the container is opened. The insert is formed from two mouldings (2, 12) which snap together. One of the mouldings (12) is deformable between a convex and a concave configuration. Apertures (10a, 14) are provided in each moulding so that when the moulding (12) is in its convex configuration, communication is provided via the apertures into the insert. When the moulding (12) is in its concave configuration this communication is substantially restricted, leaving only a small passage (14a). In use, a jet of gas is released from the insert via this aperture in order to cause the production of foam in the beverage. The invention also extends to a method of filling the insert (1) with nitrogen gas.
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