Frustoconical plastic capsules have a lower height than the common aluminum capsules to prepare an espresso, in order to avoid that the hot water injection needles penetrate into the sachet of plastic and glue. This is outside of the frustum-shaped capsule with its conical side wall (2) and the peripheral thereof projecting, circumferential flange (5) a larger amount of heated water at elevated pressure on. This requires higher requirements for the sealing of the frustoconical capsule with respect to the brewing chamber, in which the capsule is introduced. It is therefore proposed to apply both the head part side surface (9) and on the opposite welding surface (7) each comprise a seal (8) on the flange (5).
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