| 摘要 |
The invention relates to a closed flexible sachet (11) in the form of an individual portion provided for extraction under pressure, containg ground roast coffee (41), consisting of two identical flexible sheets or of a single folded flexible sheet of circular, oval or polygonal shape, creating a space for the coffee between the two sheets or between the two faces of the folded sheet (11), and the two sheets or the two faces of the folded sheet are welded over their periphery (20, 44) so that the said sachet is substantially symmetrical with respect to its welding plane, and the sachet is opened through the effect only of the rise in pressure which takes place upon injection of the extraction fluid, in which the two flexible sheets or the two faces of the folded sheet extend over one side of the said sachet beyond their welding line so as to provide, between the said sheets or between the two faces of the folded sheet, a channel (15) which allows the arrival of the extraction fluid, the said channel being substantially perpendicular to the welding line (44) on which it emerges.
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