Wick suitable for use in an electronic smoking article

• US 9,854,847 B2
• Filed: 11/13/2014
• Issued: 01/02/2018
• Est. Priority Date: 01/30/2013
• Status: Active Grant

• Current Assignee: RAI STRATEGIC HOLDINGS, INC. (British American Tobacco PLC)
• Original Assignee: RAI STRATEGIC HOLDINGS, INC. (British American Tobacco PLC)
• Inventors: Sears, Stephen Benson, Dooly, Grady Lance, Griffith, Jr., David William, Sebastian, Andries Don, Chang, Yi-Ping
• Primary Examiner(s): Yaary, Eric
• Application Number:
  US14/540,249
• Publication Number:
  US 20150068541A1
• Time in Patent Office: 1,146 Days
• Field of Search: 392395
• CPC Class Codes: A24F 40/10 Devices using liquid inhalable precursors
• CPC Class Codes: A24F 40/30 Devices using two or more structurally separated inhalable precursors, e.g. using two liquid precursors in two cartridges
• CPC Class Codes: A24F 40/44 Wicks
• CPC Class Codes: A24F 40/46 Shape or structure of electric heating means
• CPC Class Codes: F22B 1/28 in boilers heated electrically superheating using an electrical heat source independent from heat supply of the steam boiler F22G1/165

Abstract

The present disclosure relates to an electronic smoking article that provides for improved aerosol delivery. Particularly, the article comprises a wicking element useful for improving delivery of aerosol precursor to a heating element. In particular, the wick can take on a brush-like configuration. The present disclosure further relates to methods of forming an aerosol in a smoking article.

Claims

1. A method of forming an aerosol in a smoking article, the method comprising initiating current flow from an electrical power source within the smoking article to a resistance heating wire within the smoking article, the heating wire being intertwined with a wick formed of a plurality of individual filaments aligned in a brush-like configuration, the individual filaments each comprising an affixed end and a free end, so as to cause heating of the heating wire and vaporization of an aerosol precursor composition transported by the wick;

wherein the smoking article comprises a central axis extending the length of the smoking article and an exterior shell wall, and the wick is positioned within the smoking article such that the aerosol precursor composition is transported outward from the central axis toward the exterior shell wall or is transported inward, relative to the exterior shell wall, toward the central axis.

2. The method of claim 1, wherein the filaments are axially aligned along a length of the hollow shell.

3. The method of claim 1, wherein the axial alignment is substantially a straight line or wherein the axial alignment is substantially helical.

4. The method of claim 1, wherein the heating wire is woven into the filaments of the wick.

5. The method of claim 1, wherein the heater comprises a plurality of resistance heating wires.

6. The method of claim 5, wherein the resistance heating wires are simultaneously heated.

7. The method of claim 5, wherein the aerosol precursor composition comprises two or more separate components, and wherein the separate components of the aerosol precursor composition are separately heated by the simultaneously heated heating wires.

8. The method of claim 5, wherein the simultaneously heated heating wires receive current flow from the electrical power source under different conditions such that the heating wires are heated to different temperatures or are heated for different amounts of time.

9. The method of claim 5, wherein two or more of the heating wires are heated in a defined sequence or pattern.