Cap for sealing a container

1. A cap comprising:

a body,

an opening passing through the cap and adapted in turn to be passed through by at least one product transfer member, and

a membrane which, at rest, covers the opening,

wherein the membrane has a main portion that extends through the opening and defines two inclined faces, each inclined face having a distal edge, and

wherein the two inclined faces form a dihedron when the membrane is at rest, the distal edges of the two inclined faces coming together at the apex of the dihedron,

wherein said cap comprises at least two flaps extending through the opening, above the membrane, the two inclined faces of the membrane being respectively covered by the two flaps, each flap having a free edge that extends along the distal edge of the corresponding inclined face, so that, when the transfer member passes through the opening and the membrane, the free edges of the two flaps respectively press along the distal edges of the two inclined faces,

wherein each flap has a lower surface facing the membrane and an upper surface opposite the lower surface, wherein the lower surface of each flap includes at least a first geometric feature having a first configuration, wherein corresponding inclined faces of the membrane include at least a second geometric feature having a second configuration complementary to the first configuration, and wherein an entirety of the first or second geometric features is enclosed by the other of the first and second geometric features.

2. The cap according to claim 1 , wherein each flap has, on its upper surface, an overthickness that extends along the free edge of the flap.

3. The cap according to claim 2 , wherein the overthickness is formed by a portion of the flap whose thickness increases continuously as one comes closer to the free edge.

4. The cap according to claim 1 , wherein the opening extends axially between an intake orifice and a main portion of the membrane, and wherein the apex of the dihedron has two opposite ends, the cap comprising two guide elements respectively extending between the intake orifice and the two opposite ends of the apex, at a periphery of the opening.

5. The cap according to claim 1 , wherein the membrane is made from a first material and the flaps from a second material that is more rigid than the first material.

6. The cap according claim 1 , wherein the membrane is made from a first material and the flaps from a second material, different from the first material and such that a coefficient of friction of the transfer member on the second material is lower than a coefficient of friction of the transfer member on the first material.

7. The cap according to claim 1 , wherein the membrane is pierceable and/or tearable along the apex of the dihedron.

8. The cap according to claim 1 , wherein the distal edges of the inclined faces and the free edges of the flaps are substantially parallel to one another.

9. The cap according to claim 1 , wherein the distal edges of the inclined faces and the free edges of the flaps are substantially rectilinear.

10. A system comprising a cap according to claim 1 and a container, the cap closing the container.

11. The system according to claim 10 , further comprising a product transfer member configured to pass through the opening and the membrane and to transfer a product from an inside area toward an outside area of the container, or vice versa.

12. The system according to claim 11 , wherein the transfer member has a transverse section with a width smaller than a length of the distal edges of the inclined faces, and wherein the free edges of the flaps have a length comprised between the width of the transverse section and the length of the distal edges.