| 摘要 |
A device for use in a can which is to be filled with beverage and sealed and pressurised in known manner, adapted for location within the can so as to remain submerged within the beverage until the can is opened and the latter is dispensed, and which as a result of the pressurisation of the can itself becomes pressurised as the contents of the can pressurise after the can is sealed. The device is constructed at least in part as a hollow annular chamber (10) having a small orifice (36) in the wall thereof and is adapted to be retained within the can at a height such that at least the orifice remains submerged in the beverage when the can has been filled, whether the can is upright or not. One form of the device is a ring, the outside diameter of which is less than the diameter of the open end of the can through which the beverage is poured, to facilitate its entry. The orifice is located in a section of the chamber wall which faces radially inwardly, and its position is such that when the can is pressurised the volume of beverage which will enter the chamber is insufficient to reach the level of the hole. In a preferred arrangement the chamber is divided internally by a baffle (74) which divides the chamber into inner and outer annular compartments, internal communication between the inner and outer annular compartments only being provided at an elevated position therewithin. In another arrangement the device comprises a hollow cylindrical capsule the upper face of which is dished axially inwardly so as to form a significant depression or bowl, and the gas jetting orifice is formed in the dished surface. |
