Canister for containing an active material

1. A canister for containing an active material, like an oxygen scavenger, a desiccant or another functional material, comprising

a canister body comprising a bottom wall and at least one sidewall with inner and outer sidewall surfaces and an upper rim, wherein the at least one sidewall extends from the bottom wall; and

a closing element comprising a top wall with an outer surface and an inner surface, and a fixing portion surrounding the top wall; wherein

the top wall and/or the bottom wall and/or at least one of the at least one sidewall of the canister body comprises at least one membrane region with a predetermined permeability to a defined gaseous substance, wherein the membrane region is substantially unperforated; and wherein the membrane region is integrally formed with the top wall and/or the bottom wall and/or at least one sidewall of the canister body; and

wherein the fixing portion comprises an elevated or recessed snap portion around its outer periphery which is shaped corresponding to a mating geometry around the inner sidewall surface of the sidewall of the canister body so as to form a snap connection with the canister body; and wherein

the closing element is fixed to the canister body in such a way that the outer surface of the top wall does not extend beyond the upper rim of the sidewall of the canister body.

2. The canister according to claim 1 , wherein the snap portion of the closing element comprises an elevated portion thereof.

3. The canister according to claim 1 , characterized in that

the inner sidewall surface of the sidewall of the canister body comprises a peripheral groove close to the upper rim.

4. The canister according to claim 1 , wherein the canister body is in a cylindrical shape; and the top wall of the closing element comprises reinforcing ribs extending in a radial direction.

5. The canister according to claim 4 , wherein the thickness (T) of the reinforcing ribs is between 0.8 mm and 1.5 mm.

6. The canister according to claim 1 , wherein the thickness (t) of the membrane region is between 0.1 mm and 0.6 mm.

7. The canister according to claim 1 , wherein the canister body is in a cylindrical shape and the bottom wall of the canister body is provided with a plurality of radially arranged spokes arranged at an inner side of the bottom wall.

8. The canister according to claim 7 , wherein the spokes connect a central hub portion to the inner sidewall surface of the sidewall.

9. The canister according to claim 1 , wherein the canister is filled with an active material able to trap and/or release a desired substance selected from the group consisting of moisture, oxygen and a fragrance.

10. The canister according to claim 1 , wherein a composition material of the closing element is different from a composition material of the canister body.

11. The canister according to claim 10 , wherein the composition material of the canister body has a higher resilience than the composition material of the closure element.

12. The canister according to claim 1 , wherein the fixing portion of the closure element is axially symmetric with regard to a median plane of the closure element.

13. The canister according to claim 1 , wherein the canister body and the closing element are both injection molded.

14. The canister according to claim 1 , wherein the canister body is integrated in a lid or cap of a container.

15. The canister according to claim 14 , wherein the bottom wall of the canister body is integrally formed with a top wall of the lid or cap.

16. The canister according to claim 2 , wherein the snap portion of the closing element comprises a beveled edge between beveled side flanks of the elevated portion.

17. The canister according to claim 4 , wherein the reinforcing ribs extending in a radial direction have a geometry of a cross.

18. The canister according to claim 1 , wherein the thickness (t) of the membrane is about 0.25 mm.