| 摘要 |
The present invention concerns cartridges for producing beverages, especially coffee beverages, that have a fine bubble foam on the surface of the beverage, known as crema. In the beverage flow path within the cartridge there is a curved or angular eductor channel and a downstream cyclonic chamber. Beverage passing through the cartridge from the annular channel 69 is forced into a high velocity jet into the educator channel 80 where air is incorporated from an air inlet 71. A deflector channel downstream of the aperture imparts an asymmetrical flow to the beverage, and there is at least one impact surface 81b onto which the jet of beverage impinges to complete entrainment of the air bubbles. After exiting the educator channel the flow of beverage circulates within zone 93 where it is encouraged into a cyclonic flow pattern for delivery into a receptacle. Control fins may be present in the cyclonic chamber to produce a more directable and confined flow of beverage with less splashing. The quality and/or quantity of crema produced by the cartridge may be modified by varying parameters associated with the educator channel, the air inlet or the jet of beverage. |
