| 摘要 |
When dispensing carbonated beverages, particularly beers and especially draught stout, it is desirable to obtain a close-knit creamy head. This contributes to a creamy taste and adds considerably to the customer appeal. To provide such a head a container (1) containing a carbonated beverage (13), includes a pod (6) located within the head space (14) above the level of the beverage (13) and containg a gas, the pod (6) including a hole (11) in its lower part above the level of the beverage (13) and means (12, 16) to ensure that only gas is discharged from the pod (6). The arrangement is such that when the container (1) is closed the pressures of the gas in the pod (6) and in the head space (14) are in equilibrium, but, as soon as the container (1) is opened to reduce the pressure inside the head space (14) of the container (1) the gas at super atmospheric inside the pod (6) is jetted out of the hole (11) and into the beverage (13) in the container (1) to cause shear of the beverage (13) and the liberation of small bubbles which accumulate in a surface layer on the beverage (13). When the beverage (13) is dispensed the small bubbles in its surface layer act to seed the generation of small bubbles throughout the remainder. |
