Susceptor assembly comprising one or more composite susceptor particles

Patent metadata

Field	Value
Publication number	US-12349733-B2
Application number	US-202118000498-A
Country	US
Kind code	B2
Filing date	Jun 3, 2021
Priority date	Jun 5, 2020
Publication date	Jul 8, 2025
Grant date	Jul 8, 2025

Abstract

A susceptor assembly is provided for inductively heating an aerosol-forming substrate under an influence of an alternating magnetic field, the susceptor assembly including: one or more composite susceptor particles, each one of the one or more composite susceptor particles including a particle core and a particle shell entirely encapsulating the particle core, in which the particle core includes or is made of a ferromagnetic or ferrimagnetic core material having a relative magnetic permeability of at least 200 for frequencies up to 10 kHz at a temperature of 20 degrees Celsius, and in which the particle shell includes or is made of an electrically conductive shell material. An aerosol-generating article for an inductively heating aerosol-generating device, and an aerosol-generating system including an aerosol-generating article, are also provided.

First claim

The invention claimed is:

1. A susceptor assembly for inductively heating an aerosol-forming substrate under an influence of an alternating magnetic field, the susceptor assembly comprising:
one or more composite susceptor particles,
wherein each one of the one or more composite susceptor particles comprises a particle core and a particle shell entirely encapsulating the particle core,
wherein the particle core comprises or is made of a ferromagnetic or ferrimagnetic core material having a relative magnetic permeability of at least 200 for frequencies up to 10 kHz at a temperature of 20 degrees Celsius, and
wherein the particle shell comprises or is made of an electrically conductive shell material.

2. The susceptor assembly according to claim 1 , wherein a material of the particle shell is paramagnetic.

3. The susceptor assembly according to claim 1 , wherein a material of the particle shell is one of aluminum, stainless steel, electrically conductive carbon, or bronze.

4. The susceptor assembly according to claim 1 , wherein a material of the core is electrically non-conductive.

5. The susceptor assembly according to claim 1 , wherein a material of the core has a Curie temperature in a range between 160 degrees Celsius and 400 degrees Celsius.

6. The susceptor assembly according to claim 1 , wherein a material of the core has a Curie temperature in a range between 160 degrees Celsius and 240 degrees Celsius.

7. The susceptor assembly according to claim 1 , wherein a material of the core is a ferrite powder.

8. The susceptor assembly according to claim 1 , wherein a material of the core is of a manganese-magnesium ferrite, a nickel-zinc ferrite, or a cobalt-zinc barium ferrite.

9. The susceptor assembly according to claim 1 , wherein each one of the one or more composite susceptor particles substantially has a ball shape.

10. The susceptor assembly according to claim 1 , wherein each one of the one or more composite susceptor particles has an equivalent spherical particle diameter in a range between 10 micrometers and 500 micrometers.

11. The susceptor assembly according to claim 1 , wherein each one of the one or more composite susceptor particles has an equivalent spherical particle diameter in a range between 35 micrometers and 75 micrometers.

12. The susceptor assembly according to claim 1 , wherein the particle core has an equivalent spherical core diameter in a range between 5 micrometers and 499 micrometers.

13. The susceptor assembly according to claim 1 , wherein the particle core has an equivalent spherical core diameter in a range between 30 micrometers and 55 micrometers.

14. The susceptor assembly according to claim 1 , wherein the particle shell has a shell thickness in a range between 1 micrometer and 100 micrometers.

15. The susceptor assembly according to claim 1 , wherein the particle shell has a shell thickness in a range between 5 micrometers and 12 micrometers.

16. The susceptor assembly according to claim 1 ,
wherein the particle core is a sintered particle core, and
wherein a material of the particle core is a sintered material.

17. The susceptor assembly according to claim 1 , wherein a material of the particle shell is plated, deposited, coated, or cladded onto the particle core such as to form the particle shell.

18. An aerosol-generating article for an inductively heating aerosol-generating device, the aerosol-generating article comprising:
at least one aerosol-forming substrate and a susceptor assembly according to claim 1 ,
wherein the one or more susceptor particles of the susceptor assembly are embedded in the aerosol-forming substrate.

19. The aerosol-generating article according to claim 18 , wherein the one or more susceptor particles of the susceptor assembly are distributed throughout the aerosol-forming substrate with a distribution gradient from a central axis of the aerosol-generating article to a periphery thereof.

20. An aerosol-generating system comprising the aerosol-generating article according to claim 18 and an inductively heating aerosol-generating device for the inductively heating aerosol-generating device.

Assignees

• Philip Morris Products Sa

Inventors

• Mironov Oleg

Classifications

• H05B2206/023

  using the curie point of the material in which heating current is being generated to control the heating temperature · CPC title

• H05B6/105 Primary

  using a susceptor · CPC title

• A24D1/20

  Cigarettes specially adapted for simulated smoking devices · CPC title

• A24F40/20

  Devices using solid inhalable precursors · CPC title

• A24F40/70

  Manufacture · CPC title