Method and apparatus for applying a sealing member to a capsule for preparing a beverage

1. A method for applying a sealing member to a capsule intended for preparation of a beverage in a device for making beverages, wherein the capsule includes a body having a bottom wall, a side wall and a flange-like rim which extends from the side wall, the method comprising:

applying a charge of a sealing composition in a viscous state on the flange-like rim, and

compression moulding the charge of the sealing composition against the flange-like rim,

wherein the flange-like rim has a rear face, directed towards the bottom wall of the body, and a front face, opposite to the rear face, and wherein the charge is applied by placing the charge itself on the front face of the flange-like rim and wherein, during the compression moulding, the sealing composition making up the charge is made to migrate around an end edge of the flange-like rim so as to adhere to both the front face and the rear face of the flange-like rim.

2. The method according to claim 1 , wherein the charge, during the compression moulding, is made to adhere at least to the rear face of the flange-like rim and/or in a zone of intersection between the rear face of the flange-like rim and the side wall of the body.

3. The method according to claim 1 , wherein applying the charge comprises:

passing the sealing composition through an annular orifice;

cutting off the sealing composition fed out of the annular orifice in order to obtain the charge, and

delivering the charge onto a surface of the flange-like rim.

4. The method according to claim 1 , wherein compression moulding the charge comprises:

moving one or more elements of a mould close to the flange-like rim to form a shaping cavity which includes the charge and surrounds at least part of the flange-like rim, and

compressing the charge by means of a movable presser to force the sealing composition of the charge to occupy the entire shaping cavity.

5. The method according to claim 4 , comprising:

supporting the capsule with an abutment element which contributes to forming the shaping cavity and supports the capsule on an outer portion of the flange-like rim.

6. The method according to claim 5 , wherein the flange-like rim is in contact with the abutment element by a plurality of teeth of the abutment element which are angularly spaced and positioned outside an uninterrupted inner annular portion of the shaping cavity.

7. The method according to claim 1 , comprising:

stably joining a lid to the body by sealing the lid to a front face of the flange-like rim in an inner annular zone of the front face, surrounded by an outer zone of the front face which is covered by the sealing member.

8. The method according to claim 1 , comprising:

stably joining a lid to the sealing member to close the capsule body with, enclosed therein, the infusion material needed to make the beverage.

9. The method according to claim 1 , comprising:

stably joining the lid to the body directly on a front face of the flange-like rim, wherein the sealing member is superposed on an outer edge of the lid.