Coffee capsule and system for producing a coffee extract with such capsule

A system for producing a liquid coffee extract, comprising:

• a single-use capsule with a tearable extraction foil member for the preparation of a liquid coffee extract, said capsule comprising:
• a cup-shaped body comprising a cavity containing a predetermined amount of roast and ground coffee, said cavity defined by a bottom wall and a substantially tubular side wall, the side wall comprising a main, truncated-cone or cylindrical shaped portion connected to the bottom wall and an enlarged, base portion connected to an internal peripheral edge of the main, truncated-cone or cylindrical shaped portion, wherein the enlarged, base portion comprises a larger surface area of the cavity than the main, truncated-cone or cylindrical shaped portion and forms an enlargement of the surface area of the cavity of the main, truncated-cone or cylindrical shaped portion in a radial direction relative to a line of extension of the main, truncated-cone or cylindrical shaped portion, the enlarged base portion comprising an internal peripheral edge of the base portion positioned on an end of the enlarged base portion opposite to the bottom wall, the internal peripheral edge of the base portion defining an opening;
• an annular flange extending outwardly in the radial direction from the internal peripheral edge, and
• a lid covering the opening, the lid at least partially formed by the tearable extraction foil member;
• wherein the cavity of the capsule contains at least 6.9 grams of roast and ground coffee;
• and
• wherein the opening is arranged to have an opening surface area A1 measured at the internal peripheral edge of the base portion;
• and
• a coffee preparation apparatus for preparing the liquid coffee extract from the capsule, the coffee preparation apparatus comprising an extraction unit comprising:
• an extraction chamber for receiving the capsule;
• a water injection cage for injecting water inside the cavity of the capsule;
• a capsule extraction plate for creating coffee flow orifices in the tearable extraction foil member of the capsule under an effect of a pressure of fluid in the capsule;
• wherein the extraction chamber is formed by an arrangement of the water injection cage and the capsule extraction plate;
• wherein the capsule extraction plate comprises an inner tearing portion diameter of a tearing portion surface area A2 formed by a plurality of tearing members in relief and a network of flow channels in recess separating the plurality of tearing members, and an outer portion extending about the inner tearing portion and forming a relatively smooth, non-tearing receiving surface for receiving an annular portion of the tearable extraction foil member;
• and
• wherein a ratio of A1 relative to A2 is at least 2.0.