| 摘要 |
The present invention concerns a capsule (11) containing a beverage ingredient, adapted to be functionally inserted in a food preparation machine (1), said capsule comprising walls (12) that define a cavity wherein said beverage is prepared by mixing said ingredient with a fluid injected therein under pressure by said machine, said capsule further comprising a dispensing opening (13), and opening means that open upon effect of the rise of pressure within said cavity, characterized in that said opening means comprise a flow-conducting channel (14) able to connect the capsule cavity to the dispensing opening (13) and a spring-mounted piston plug (15) that is movable in said channel between: (i) a closed position where said cavity pressure is below a first predetermined pressure Pc, the piston spring (16) is at rest, and the piston plug (15) seals against a sealing portion (19) of the channel walls, (ii) a dispensing position where said cavity pressure is equal or superior to Pc, the piston spring (16) is elastically deformed and the piston plug (15) is moved away from the channel walls so that beverage can flow outside of said capsule through said channel (14). |
