| 摘要 |
<p>The insert comprises a base section (263) and a top section (261) defining a space (266) which is hermetically sealed from its surroundings; and valve means (265) for destroying the hermetic seal; the base and/or top include a part which is deformable. The insert is inserted or assembled at substantially ambient pressure and subsequent pressurisation of the container causes the deformable part of parts to collapse until the space (266) within the insert equilibriates with the pressure within the container. The insert being held in the collapsed position, release of container pressure causes the valve means (265) to open and release the contents of the insert into the container.</p> |
