Cartridge for an aerosol-generating system

1. A heater assembly for an aerosol-generating system, the heater assembly comprising:

an electrically insulating support having an aperture;

an electrical heating element disposed across the aperture in the electrically insulating support, being configured to heat a liquid aerosol-forming substrate to form an aerosol, and being substantially flat;

capillary material, wherein a portion of the capillary material is in contact with the electrical heating element, and the capillary material is configured to convey the liquid aerosol-forming substrate to the electrical heating element; and

two electrical contacts respectively connected to ends of the electrical heating element, the two electrical contacts supported by the electrically insulating support,

wherein the capillary material is integrally formed as a single continuous piece of capillary material,

wherein the capillary material comprises ceramic,

wherein the two electrical contacts are provided on the ceramic,

wherein the electrical heating element comprises one flat filament disposed in a curved manner between the two electrical contacts,

wherein the electrical heating element is fluid permeable, and

wherein the capillary material comprises:

a pore size of 0.5 to 10 μm and a density of below 2 g/ml, or

a pore size of 15 to 40 μm and a density of below 1 g/ml.

2. The heater assembly according to claim 1 , wherein the one flat filament is curved along one or more dimensions thereof.

3. The heater assembly according to claim 1 ,

wherein the capillary material has a gradient of the pore size or porosity, such that the pore size or the porosity of the capillary material continuously decreases within the capillary material in a direction towards the electrical heating element.

4. The heater assembly according to claim 1 , wherein the single continuous piece of capillary material comprises first and second capillary materials, the first capillary material includes the pore size of 0.5 to 10 μm and the density of below 2 g/ml, and the second capillary material includes the pore size of 15 to 40 μm and the density of below 1 g/ml.

5. The heater assembly according to claim 4 ,

wherein the first capillary material is in direct contact with the electrical heating element, and

wherein the second capillary material is in contact with the first capillary material and is separated from the electrical heating element by the first capillary material.

6. The heater assembly according to claim 4 , wherein the first and the second capillary materials comprise different regions of a single continuous piece of capillary material.

7. The heater assembly according to claim 4 , wherein the second capillary material is in fluid connection with the liquid aerosol-forming substrate.

8. The heater assembly according to claim 1 , wherein the single continuous piece of capillary material has a shape of a truncated cone.

9. The heater assembly according to claim 8 , wherein capillary material is in fluid connection with the liquid aerosol-forming substrate.

10. The heater assembly according to claim 1 , wherein the capillary material is in fluid connection with the liquid aerosol-forming substrate.

11. The heater assembly according to claim 1 , wherein the pore size is 4 μm and the density is 0.5 g/ml.

12. The heater assembly according to claim 1 , wherein the pore size is 25 μm and the density is between 0.1 and 0.3 g/ml.

13. An aerosol-generating system, comprising:

an aerosol-generating device comprising a power source and a main body;

a cartridge removably inserted into the main body, the cartridge comprising:

a liquid storage portion configured to hold a liquid aerosol-forming substrate and comprising a housing including an air flow channel therein; and

a heater assembly comprising:

an electrically insulating support having an aperture,

an electrical heating element disposed across the aperture in the electrically insulating support, the electrical heating element being substantially flat,

capillary material, wherein a portion of the capillary material is in contact with the electrical heating element, and the capillary material is configured to convey the liquid aerosol-forming substrate to the electrical heating element, and

two electrical contacts respectively connected to ends of the electrical heating element, the two electrical contacts supported by the electrically insulating support; and

a mouthpiece comprising at least one air inlet and at least one air outlet,

wherein the capillary material is integrally formed as a single continuous piece of capillary material,

wherein the capillary material comprises ceramic,

wherein the two electrical contacts are provided on the ceramic,

wherein the electrical heating element comprises one flat filament disposed in a curved manner between the two electrical contacts,

wherein the electrical heating element is fluid permeable, and

wherein the capillary material comprises:

a pore size of 0.5 to 10 μm and a density of below 2 g/ml, or

a pore size of 15 to 40 μm and a density of below 1 g/ml.

14. The aerosol-generating system according to claim 13 , wherein the pore size or porosity of the portion of the capillary material in contact with the electrical heating element is less than the pore size or porosity of the another portion of the capillary material separated from the electrical heating element by the portion of the capillary material in contact with the electrical heating element.

15. The aerosol-generating system according to claim 13 , wherein the cartridge is between the main body and the mouthpiece.

16. The aerosol-generating system according to claim 13 , wherein the one flat filament is curved along one or more dimensions thereof between the two electrical contacts respectively connected to ends of the one flat filament.

17. The aerosol-generating system according to claim 13 , wherein the single continuous piece of capillary material has a shape of a truncated cone.

18. The aerosol-generating system according to claim 13 , wherein the single continuous piece of capillary material comprises first and second capillary materials, the first capillary material includes the pore size of 0.5 to 10 μm and the density of below 2 g/ml, and the second capillary material includes the pore size of 15 to 40 μm and the density of below 1 g/ml.

19. An aerosol-generating system, comprising:

an aerosol-generating device comprising a power source and a main body;

a cartridge removably inserted into the main body, the cartridge comprising:

a liquid storage portion configured to hold a liquid aerosol-forming substrate and comprising a housing including an air flow channel therein; and

a heater assembly comprising:

an electrically insulating support having an aperture,

an electrical heating element disposed across the aperture in the electrically insulating support, the electrical heating element being substantially flat,

capillary material, wherein a portion of the capillary material is in contact with the electrical heating element, and the capillary material is configured to convey the liquid aerosol-forming substrate to the electrical heating element, and

two electrical contacts respectively connected to ends of the electrical heating element, the two electrical contacts supported by the electrically insulating support; and

a mouthpiece comprising at least one air inlet and at least one air outlet,

wherein the heater assembly extends over an opening of the liquid storage portion,

wherein the capillary material is integrally formed as a single continuous piece of capillary material,

wherein the capillary material comprises ceramic,

wherein the two electrical contacts are provided on the ceramic,

wherein the electrical heating element is fluid permeable, and

wherein the capillary material comprises:

a pore size of 0.5 to 10 μm and a density of below 2 g/ml, or

a pore size of 15 to 40 μm and a density of below 1 g/ml.

20. The aerosol-generating system according to claim 19 , wherein the single continuous piece of capillary material comprises first and second capillary materials, the first capillary material includes the pore size of 0.5 to 10 μm and the density of below 2 g/ml, and the second capillary material includes the pore size of 15 to 40 μm and the density of below 1 g/ml.