Aerosol-generating article with low resistance air flow path

Patent metadata

Field	Value
Publication number	US-10617149-B2
Application number	US-201415101659-A
Country	US
Kind code	B2
Filing date	Dec 4, 2014
Priority date	Dec 5, 2013
Publication date	Apr 14, 2020
Grant date	Apr 14, 2020

Abstract

A heated aerosol-generating article for use with an aerosol-generating device is provided, including a plurality of components including an aerosol-forming substrate assembled within a wrapper to form a rod having a mouth end and a distal end upstream from the mouth end, the heated aerosol-generating article defining a first air-flow path in which air drawn into the aerosol-generating article through the mouth end passes through the aerosol-forming substrate, and a second air-flow path in which air drawn into the aerosol-generating article through the mouth end does not pass through the aerosol-forming substrate, the resistance to draw (RTD) of the second air-flow path being lower than the RTD of the first air-flow path when the heated aerosol-generating article is not coupled to an aerosol-generating device.

First claim

The invention claimed is:

1. A heated aerosol-generating article having a lowered propensity for flame ignition for use with an aerosol-generating device, the heated aerosol generating article having the lowered propensity for flame ignition comprising:
a plurality of components including an aerosol-forming substrate assembled within a wrapper to form a rod having a mouth end and a distal end upstream from the mouth end, the heated aerosol-generating article having the lowered propensity for flame ignition defining
a first air-flow path in which air drawn into the heated aerosol-generating article having the lowered propensity for flame ignition through the mouth end passes through the aerosol-forming substrate, and
a second air-flow path in which air drawn into the heated aerosol-generating article having the lowered propensity for flame ignition through the mouth end does not pass through the aerosol-forming substrate,
wherein the resistance to draw (RTD) of the second air-flow path is lower than the RTD of the first air-flow path,
wherein the RTD of the second air-flow path is less than 10 mm WG,
wherein the aerosol-forming substrate comprises an aerosol former at a content of between 5% and 30% on a dry weight basis, and
wherein the aerosol-forming substrate has a length of between 7 millimeters and 15 millimeters and wherein the heated aerosol-generating article has a diameter of 7.2 millimeters and a length of 45 millimeters.

2. The heated aerosol-generating article having the lowered propensity for flame ignition according to claim 1 , wherein the RTD of the second air-flow path is lower than the RTD of the first air-flow path when the heated aerosol-generating article having the lowered propensity for flame ignition is not coupled to the aerosol-generating device.

3. The heated aerosol-generating article having the lowered propensity for flame ignition according to claim 1 , wherein the RTD of the second air-flow path is no more than 0.9 times the RTD of the first air-flow path.

4. The heated aerosol-generating article having the lowered propensity for flame ignition according to claim 1 , wherein interaction between the heated aerosol-generating article having the lowered propensity for flame ignition and the aerosol-generating device increases the RTD along the second air-flow path such that air flow is favoured along the first air-flow path.

5. The heated aerosol-generating article having the lowered propensity for flame ignition according to claim 1 , wherein the aerosol-forming substrate is located at, or towards, the distal end of the rod, and one or more perforations through the wrapper downstream of the aerosol-forming substrate form part of the second air-flow path.

6. The heated aerosol-generating article having the lowered propensity for flame ignition according to claim 1 , wherein the wrapper is a perforated wrapper allowing air to be drawn into the heated aerosol-generating article having the lowered propensity for flame ignition through the wrapper downstream of the aerosol-forming substrate.

7. The heated aerosol-generating article having the lowered propensity for flame ignition according to claim 1 , wherein a support element is located downstream of the aerosol-forming substrate, a hole defined through a radial wall of the support element forming part of the second air-flow path.

8. The heated aerosol-generating article according to claim 1 , wherein the RTD of the second air-flow path is between 0.2 and 0.7 times the RTD of the first air-flow path.

9. The heated aerosol-generating article according to claim 1 , wherein the RTD of the second air-flow path is between 0.3 and 0.5 times the RTD of the first air-flow path.

10. The heated aerosol-generating article according to claim 1 , wherein the aerosol former is a polyhydric alcohol.

11. The heated aerosol-generating article according to claim 1 , wherein the gathered sheet is a gathered perforated sheet of homogenised tobacco.

Assignees

• Philip Morris Products Sa

Inventors

• Malgat Alexandre
• Roudier Stephane
• Borges De Couraca Ana Carolina
• Lavanchy Frederic
• Meyer Cedric

Classifications

• A24F40/40

  Constructional details, e.g. connection of cartridges and battery parts · CPC title

• A24F42/10

  Devices with chemical heating means · CPC title

• H05B6/108

  for heating a fluid · CPC title

• A24B3/14 Primary

  Forming reconstituted tobacco products, e.g. wrapper materials, sheets, imitation leaves, rods, cakes; Forms of such products (delustering A24C1/40) · CPC title

• A24F47/008 Primary

  Human Necessities · mapped topic