Aerosol-generating article with low resistance air flow path

• US 10,617,149 B2
• Filed: 12/04/2014
• Issued: 04/14/2020
• Est. Priority Date: 12/05/2013
• Status: Active Grant

• Current Assignee: Philip Morris Products SA (Philip Morris Limited)
• Original Assignee: Philip Morris Products SA (Philip Morris Limited)
• Inventors: Malgat, Alexandre, Roudier, Stephane, Borges de Couraca, Ana Carolina, Lavanchy, Frederic, Meyer, Cedric
• Primary Examiner(s): Yaary, Eric
• Application Number:
  US15/101,659
• Publication Number:
  US 20160331032A1
• Time in Patent Office: 1,958 Days
• Field of Search: None
• CPC Class Codes: A24B 3/14 Forming reconstituted tobacco products, e.g. wrapper materials, sheets, imitation leaves, rods, cakes; Forms of such products delustering A24C1/40
• CPC Class Codes: A24D 1/20 Cigarettes specially adapted for simulated smoking devices
• CPC Class Codes: A24F 40/20 Devices using solid inhalable precursors
• CPC Class Codes: A24F 40/40 Constructional details, e.g. connection of cartridges and battery parts
• CPC Class Codes: A24F 40/465 specially adapted for induction heating
• CPC Class Codes: A24F 42/10 Devices with chemical heating means
• CPC Class Codes: H05B 6/108 for heating a fluid

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.

Claims

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.