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1. (WO2017207322) FLUID PERMEABLE HEATER ASSEMBLY FOR AEROSOL-GENERATING SYSTEMS
Anmerkung: Text basiert auf automatischer optischer Zeichenerkennung (OCR). Verwenden Sie bitte aus rechtlichen Gründen die PDF-Version.

Claims

Fluid permeable heater assembly for aerosol-generating systems, the fluid permeable heater assembly comprises an electrically conductive flat filament arrangement, and

a first contact point and a second contact point for electrically contacting the flat filament arrangement, wherein a longitudinal axis is defined between the first contact point and the second contact point,

wherein a center resistance Rc is the electrical resistance between two points situated on the

longitudinal axis, one of the two points being situated at a distance from the first contact point equal to 40 percent and the other one of the two points being situated at a distance from the first contact point equal to 60 percent of the distance between the first and the second contact point;

wherein a first resistance Rl is an electrical

resistance between the first contact point and a point situated on the longitudinal axis at a distance from the first contact point equal to 20 percent of the distance between the first and the second contact point;

wherein a second resistance R2 is an electrical

resistance between the second contact point and a point situated on the longitudinal axis at a distance from the first contact point equal to 80 percent of the distance between the first and the second contact point;

and wherein a ratio of the center resistance to the first resistance Rc/Rl is between 2 and 400, and wherein a ratio of the center resistance to the second

resistance Rc/R2 is between 2 and 400.

Heater assembly according to claim 1, comprising a total resistance Rt corresponding to the electrical resistance between the first contact point and the second contact point,

wherein a ratio of the center resistance to the total resistance Rc/Rt corresponds to at least 0.5;

wherein a ratio of the first resistance to the total resistance Rl/Rt is between 0.005 and 0.125, and wherein a ratio of the second resistance to the total resistance R2/Rt is between 0.005 and 0.125.

Heater assembly according to any one of the preceding claims, further comprising:

a first transition resistance Rltp corresponding to the electrical resistance between two points situated on the longitudinal axis, one of the two points being situated at a distance from the first contact point equal to 20 percent and the other one of the two points being situated at a distance from the first contact point equal to 40 percent of the distance between the first and the second contact point; and

a second transition resistance R2tp corresponding to the electrical resistance between two points situated on the longitudinal axis, one of the two points being situated at a distance from the first contact point equal to 60 percent and the other one of the two points being situated at a distance from the first contact point equal to 80 percent of the distance between the first and the second contact point;

wherein a ratio of the first transition resistance to the first resistance Rltp/Rl is between 1.1 and 400, wherein a ratio of the second transition resistance to the second resistance R2tp/R2 is between 1.1 and 400, and wherein a ratio of the center resistance to the first transition resistance Rc/Rltp is between 1.1 and 400,

and wherein a ratio of the center resistance to the second transition resistance Rc/R2tp is between 1.1 and 400.

Heater assembly according to any one of the preceding claims, wherein a total resistance Rt corresponding to the electrical resistance between the first contact point and the second contact point is between 0.5 Ohm and 4 Ohm, wherein the center resistance Rc is higher than 0.5 Ohm, wherein the first resistance Rl and the second resistance R2 are each lower than 100 mOhm.

Heater assembly according to any one of the preceding claims, comprising a central longitudinal region extending from the first contact point to the second contact point, wherein an electrical resistance in the central longitudinal region is lower than an electrical resistance outside of the central longitudinal region.

Heater assembly according to any one of the preceding claims, wherein the electrically conductive flat filament arrangement is a perforated sheet, with a center surface of the perforated sheet comprising a plurality of heater filaments and with a first and second side surface of the perforated sheet comprising plurality of openings, the first and second side

surfaces being arranged on opposite sides of the center surface, the first side surface comprising the first contact point and the second side surface comprising the second contact point.

7. Heater assembly according to any one of claims 1 to 5, wherein the electrically conductive flat filament arrangement is a mesh arrangement comprising a center surface and a first and a second side surface, wherein a mesh of a center surface and meshes of first and second side surfaces each comprise a mesh density, wherein the mesh density in the center surface is lower than the mesh density in each of the first and second side surfaces, wherein the first and second side surfaces are arranged on opposite sides of the center surface, the first side surface comprising the first contact point and the second side surface comprising the second contact point.

8. Heater assembly according to claim 7, wherein a mesh

density gradient is located between the first side surface and the center surface and between the center surface and the second side surface.

9. Heater assembly according to any one of claims 7 to 8, wherein the meshes of the first and the second side surface comprise a weft aperture larger than zero and no warp aperture.

10. Heater assembly according to any one of claims 7 to 9, wherein in weaving direction of the filament arrangement a same number of filaments are arranged next to each other in the center surface and in the first and the second side surfaces.

11. Heater assembly according to any one of claims 7 to 10, wherein in weaving direction of the filament arrangement more filaments are arranged in a central longitudinal region than outside the central longitudinal region.

12. Heater assembly according to any one of the preceding claims, further comprising:

a substrate comprising an opening through the substrate, the electrically conductive flat filament arrangement extending over the opening in the substrate; and a fastener attaching the flat filament arrangement to the substrate .

13. Heater assembly according to claim 12, wherein the

fastener is electrically conductive and serves as electrical contact for providing heating current through the filament arrangement.

14. Heater assembly according to any one of claims 12 to 13, wherein the fastener is a mechanical fastener such as clamps, screws or form-locking fastener.

15. Electrically operated aerosol-generating system

comprising :

an aerosol-generating device and a cartridge comprising a liquid aerosol-forming substrate;

a fluid permeable heater assembly according to any one of claims 1 to 14 for heating liquid aerosol-forming substrate,

wherein the cartridge comprises a housing having an opening, with the heater assembly extending across the opening of the housing of the cartridge,

and wherein the aerosol-generating device comprises a main body defining a cavity for receiving the cartridge, an electrical power source, and electrical contacts for connecting the electrical power source to the heater assembly .