| 摘要 |
A capsule for extraction of coffee comprises a thermoformed truncated cone-shaped plastic capsule body having an outlet side and an inlet side. A destructible inlet sealing membrane (11) attached inside the capsule body closes an inlet opening (10). A circumferential centring ramp (12) ends in an inwardly directed circumferential flange (9) forming the circular inlet opening (10). Said centring ramp (12) is designed to align said membrane (11) with the inlet opening (10) before welding it to the flange (9). The membrane (11) has a diameter larger than the outer diameter of the flange (9), a circular edge (13) being bent upwards along the centring ramp (12) and at least partially covering the latter when welding the membrane to the second flange (9). Said circular edge forms a heat protecting layer between a hot sealing tool (14) and the centring ramp (12). |
