Multi-segment component with intumescent coating

Patent metadata

Field	Value
Publication number	US-12178235-B2
Application number	US-201917055796-A
Country	US
Kind code	B2
Filing date	May 16, 2019
Priority date	May 17, 2018
Publication date	Dec 31, 2024
Grant date	Dec 31, 2024

Abstract

A multi-segment component for an aerosol-generating article is provided, the multi-segment component including: a combustible heat source; an aerosol-forming substrate downstream of the combustible heat source; and a wrapper circumscribing a rear portion of the combustible heat source and at least a front portion of the aerosol-forming substrate, a front portion of the combustible heat source extending beyond the wrapper so that the front portion of the combustible heat source is exposed during use; and an intumescent coating on all or part of the front portion of the combustible heat source, the intumescent coating being configured to form a heat insulating layer on the front portion of the combustible heat source in response to heating by the combustible heat source.

First claim

The invention claimed is:

1. A multi-segment component for an aerosol-generating article, the multi-segment component comprising:
a combustible heat source;
an aerosol-forming substrate downstream of the combustible heat source; and
a wrapper circumscribing a rear portion of the combustible heat source and at least a front portion of the aerosol-forming substrate, wherein a front portion of the combustible heat source extends beyond the wrapper so that the front portion of the combustible heat source is exposed during use; and
an intumescent coating on all or part of the front portion of the combustible heat source, the intumescent coating being configured to form a heat insulating layer on the front portion of the combustible heat source in response to heating by the combustible heat source.

2. The multi-segment component according to claim 1 , wherein the intumescent coating is provided on substantially an entire outer surface of the front portion of the combustible heat source.

3. The multi-segment component according to claim 1 , wherein the intumescent coating is provided in a discontinuous pattern on the front portion of the combustible heat source.

4. The multi-segment component according to claim 3 , wherein the discontinuous pattern comprises one or more lines, rings, dots, or other discrete geometric shapes of intumescent material, or any combination thereof.

5. The multi-segment component according to claim 1 , wherein the intumescent coating is provided only on the front portion of the combustible heat source.

6. The multi-segment component according to claim 1 , wherein the intumescent coating is provided on substantially an entire length of the combustible heat source.

7. The multi-segment component according to claim 6 ,
wherein the intumescent coating comprises a first intumescent coating on the front portion of the combustible heat source, and a second intumescent coating on the rear portion of the combustible heat source, and
wherein the first and the second intumescent coatings are formed from different intumescent materials.

8. The multi-segment component according to claim 1 , wherein the intumescent coating has an expansion ratio of at least about 1.5:1, when heated from 20 degrees Celsius to 700 degrees Celsius at 1 atmosphere of pressure.

9. The multi-segment component according to claim 1 , wherein the intumescent coating has an expansion ratio of from about 1.5:1 to about 8:1, when heated from 20 degrees Celsius to 700 degrees Celsius at 1 atmosphere of pressure.

10. The multi-segment component according to claim 1 , wherein the intumescent coating has a thickness of from about 100 micrometres to about 2 millimetres.

11. The multi-segment component according to claim 1 , wherein the intumescent coating has a thickness of from about 200 micrometres to about 1 millimetre.

12. The multi-segment component according to claim 1 , wherein the heat insulating layer formed by the intumescent coating is porous.

13. The multi-segment component according to claim 1 , wherein the front portion of the combustible heat source has a length of at least 25 percent of a total length of the combustible heat source.

14. The multi-segment component according to claim 1 , wherein the wrapper comprises one or more layers of heat-conductive material.

15. An aerosol-generating article comprising a multi-segment component according to claim 14 , and a mouthpiece disposed downstream of the multi-segment component.

Assignees

• Philip Morris Products Sa

Inventors

• Bonnely Samuel
• Canal Ponsico Anna
• Duc Fabien
• Gaudio Giuseppe
• Nussbaumer Simon
• Suarez Lucien

Classifications

• A24D1/042

  with mouthpieces (A24D1/047 takes precedence) · CPC title

• A24D1/02

  with special covers · CPC title

• A24D1/22

  Cigarettes with integrated combustible heat sources, e.g. with carbonaceous heat sources · CPC title

• A24B15/14

  made of tobacco and a binding agent not derived from tobacco · CPC title

• A24D1/027

  with ventilating means, e.g. perforations · CPC title