The invention relates to a method for applying a sealing member onto the cup-shaped container of a capsule intended for producing a beverage in a beverage production device, wherein the container has a bottom wall, a side wall with an outer surface, an open end and an annular flange which extends from the side wall of the container at the open end; the flange comprising a flange outer surface merging with the outer surface of the side wall at a transition area an flange inner surface opposite to the outer surface for being sealed with a beverage delivery wall, the method comprising the steps of: depositing molten thermoplastic polymer material by a depositing apparatus onto the outer surface of the annular flange and/or onto the transition area, subsequently pressing the thermoplastic polymer material by a punch-die while the material still being plastically deformable so as to conform it in its final shape onto the outer surface of the annular flange and/or onto the transition area thereby forming it into an annular sealing member attached to the container. The invention further relates to a device adapted for carrying out the method.
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