Susceptor assembly for inductively heating an aerosol-forming substrate

Patent metadata

Field	Value
Publication number	US-11399564-B2
Application number	US-201816495892-A
Country	US
Kind code	B2
Filing date	Mar 29, 2018
Priority date	Mar 31, 2017
Publication date	Aug 2, 2022
Grant date	Aug 2, 2022

Abstract

The present invention relates to a susceptor assembly ( 1 ) for inductively heating an aerosol-forming substrate and to a method for producing such an assembly. The susceptor assembly comprises a first susceptor ( 10 ) and a second susceptor ( 20 ). A Curie temperature of the second susceptor is lower than 500° C. At least a portion of an outer surface of the second susceptor comprises an anti-corrosion covering ( 30 ) and at least a portion of an outer surface of the first susceptor is exposed. The invention further relates to aerosol-generating article comprising an aerosol-forming substrate and a susceptor assembly.

First claim

The invention claimed is:

1. A susceptor assembly for inductively heating an aerosol-forming substrate, comprising a first susceptor and a second susceptor, the second susceptor having a Curie temperature lower than 500° C., wherein the first susceptor and the second susceptor are in intimate physical contact with each other, wherein at least a portion of an outer surface of the second susceptor comprises an anti-corrosion covering and wherein at least a portion of an outer surface of the first susceptor is exposed.

2. The susceptor assembly according to claim 1 , wherein the anti-corrosion covering comprises at least one of a corrosion-proof metal, an inert metal, a corrosion-proof alloy, a corrosion-proof organic coating, a glass, a ceramic, a polymer, an anti-corrosion paint, a wax or a grease.

3. The susceptor assembly according to claim 1 , wherein the first susceptor comprises ferromagnetic stainless steel and wherein the second susceptor comprises nickel or a nickel alloy.

4. The susceptor assembly according to claim 1 , wherein the first susceptor or the second susceptor or both, the first and the second susceptor, have a planar or blade-like shape.

5. The susceptor assembly according to claim 1 , wherein the susceptor assembly is a multilayer susceptor assembly, and wherein the first susceptor, the second susceptor and the anti-corrosion covering form adjacent layers of the multilayer susceptor assembly.

6. The susceptor assembly according to claim 5 , wherein the anti-corrosion covering is an edge layer of the multilayer susceptor assembly.

7. The susceptor assembly according to claim 1 , wherein all portions of the outer surface of the second susceptor, unless in intimate physical contact with the first susceptor, comprise an anti-corrosion covering.

8. The susceptor assembly according to claim 1 , wherein all portions of an outer surface of the first susceptor, unless in intimate physical contact with the second susceptor, are exposed.

9. The susceptor assembly according to claim 1 , wherein the second susceptor comprises one or more second susceptor elements, each being in intimate physical contact with the first susceptor, wherein at least a portion of an outer surface of each second susceptor element comprises an anti-corrosion covering.

10. An aerosol-generating article comprising an aerosol-forming substrate and a susceptor assembly according to claim 1 .

11. The aerosol-generating article according to claim 10 , wherein the susceptor assembly is embedded in the aerosol-forming substrate.

12. A method for producing a susceptor assembly for inductively heating an aerosol-forming substrate, the method comprising the following steps:
providing a first susceptor, wherein at least a portion of an outer surface of the first susceptor is exposed;
providing a second susceptor, wherein a Curie temperature of the second susceptor is lower than 500° C.;
assembling the first and the second susceptor to be in intimate physical contact with each other; and
applying an anti-corrosion covering to at least a portion of an outer surface of the second susceptor.

13. The method according to claim 12 , wherein the anti-corrosion covering is plated, deposited coated, cladded or welded onto at least the portion of the outer surface of the second susceptor.

Assignees

• Philip Morris Products Sa

Inventors

• Rossoll Andreas Michael
• Fursa 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

• H05B6/108

  for heating a fluid · CPC title

• H05B6/105

  using a susceptor · CPC title

• A61M2205/025

  Materials providing resistance against corrosion · CPC title

• A61M2205/0238

  the material being a coating or protective layer · CPC title