| 摘要 |
<p>A device for generating a head on a sealed container beverage when the container is opened, comprising a capsule (14) which initially floats on the beverage and has a first aperture (16) below the liquid surface through which can enter a capsule compartment from which gas is displaceable into the container headspace via a second aperture (23) and a ballast means with which the entering liquid combines to cause the capsule to invert, preferably after sinking, whereby a movable valve closure element (19) traps a volume of gas in the capsule which, when the container is opened, can escape through the depressurised liquid to cause formation of a head on the beverage.</p> |
