Abstract: Coffee capsule for coupling with multiple group heads has a flange whose proximal end meets a bottom end of the side wall. A raised plateau adjacent a bottom end of the side wall may receive pressure from and form a fluid-tight seal against the group head together with the side wall. A proximal lip more radially distal than the first plateau higher than the first plateau may protrude from the top surface of the flange. The side wall may have a narrowed top section to avoid protrusions from the group head. A curved top may have a circumferential strip of reduced thickness for water inlet formation. A second plateau along the top surface of the flange more radially distal than the proximal lip may form a fluid-tight seal against a different group head. The capsule may be made of polypropylene copolymer TR-50 and preferably about 80% TR-50 to facilitate sealing.

Abstract: Coffee capsule for coupling with multiple group heads has a flange whose proximal end meets a bottom end of the side wall. A raised plateau adjacent a bottom end of the side wall may receive pressure from and form a fluid-tight seal against the group head together with the side wall. A proximal lip more radially distal than the first plateau higher than the first plateau may protrude from the top surface of the flange. The side wall may have a narrowed top section to avoid protrusions from the group head. A curved top may have a circumferential strip of reduced thickness for water inlet formation. A second plateau along the top surface of the flange more radially distal than the proximal lip may form a fluid-tight seal against a different group head. The capsule may be made of polypropylene copolymer TR-50 and preferably about 80% TR-50 to facilitate sealing.

Abstract: A coffee capsule for placement in a group head of espresso-making machines may produce espresso like that made by baristas. The capsule has a body wall, a curved top with a circumferential strip of reduced thickness configured for puncture and a circular flange projecting outward from the bottom end of the body wall. The capsules seals tightly with the group head against water leakage and produces espresso of optimal extraction rate due to one or more of the following: the thickness of the flange, the proximal ridge and small step on the flange, the outer step adjacent the body wall projecting upward from the bottom end of the body wall In addition, the coffee capsule may be made of polypropylene copolymer TR-50 and preferably about 80% TR-50 to also facilitate sealing. The flange has a pre-welding diameter calculated to expand to about 37 mm after being welded to the lid.