Capsule for the preparation of a beverage and a method for manufacturing said capsule

A method for manufacturing a capsule, wherein said capsule comprises:

• a cup-shaped body, with a bottom wall, a lateral wall and a flange, and a cover sealed onto the flange for closing the cup-shaped body,
• wherein the bottom wall comprises:
• at least a fluid injection portion, suitable for being pierced by a piercing member of the beverage preparation device, and at least a surrounding portion surrounding said first fluid injection portion;
• wherein the cup-shaped body comprises a cellulose pulp layer made of cellulose pulp, and an oxygen barrier liner attached to said cellulose pulp layer;
• wherein the cup-shaped body of the capsule is obtained by moulding in a mould a dry or wet, preferably wet, cellulose pulp, and by attaching the oxygen barrier liner to the moulded cellulose pulp layer;
• the method comprising:
• a step wherein the thickness (T1) of said fluid injection portion is decreased with respect to the thickness (T2) of said at least a surrounding portion such as to improve the piercing of said fluid injection portion by the piercing member and to increase the stiffness of this fluid injection portion with respect to the stiffness of said surrounding portion, and
• said thickness decreasing being made during the moulding process of the cup-shaped body or in a successive step by applying:
• a local mechanical compression only to the cellulose pulp layer of said injection portion, or to both said cellulose pulp layer and the oxygen barrier liner of said injection portion.