Wick suitable for use in an electronic smoking article

• US 8,910,640 B2
• Filed: 01/30/2013
• Issued: 12/16/2014
• Est. Priority Date: 01/30/2013
• Status: Active Grant

• Current Assignee: RAI STRATEGIC HOLDINGS, INC. (British American Tobacco PLC)
• Original Assignee: R J Reynolds Tobacco Company (R. J. Reynolds Tobacco)
• Inventors: Dooly, Grady Lance, Griffith, David William Jr., Sebastian, Andries Don, Chang, Yi-Ping, Sears, Steven Benson
• Primary Examiner(s): Crispino, Richard
• Assistant Examiner(s): Yaary, Eric
• Application Number:
  US13/754,324
• Publication Number:
  US 20140209105A1
• Time in Patent Office: 685 Days
• Field of Search: 392/390, 392/395, 422/125, 12820014-20023, 128/202.21, 128/203.26, 128/204.13, 126/358.1, 239 44- 515
• US Class Current: 131/273
• 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 smoking article comprising:

a hollow shell comprising an exterior wall with a mouthend and including a wick formed of a plurality of individual filaments aligned in a brush-like configuration, the individual filaments each comprising a first end that is affixed to a holding member and an opposing free end, and the mouthend of the hollow shell being configured for draw of formed aerosol by a user; and

an aerosol precursor composition, wherein;

the wick is positioned within the hollow shell such that the free ends of the filaments are directed toward an interior of the hollow shell and so as to transport the aerosol precursor material inward, relative to the exterior wall, from the holding member toward a central axis extending the length of the hollow shell;

or

the wick is positioned within the hollow shell such that the free ends of the filaments are directed outward from the central axis extending the length of the hollow shell and so as to transport the aerosol precursor material outward from the central axis toward the exterior wall of the hollow shell.

2. The smoking article of claim 1, wherein the filaments are circumferentially positioned around a segment of an interior surface of the hollow shell.

3. The smoking article of claim 2, wherein the filaments are circumferentially positioned around a plurality of segments of the interior surface of the hollow shell.

4. The smoking article of claim 1, wherein the filaments are axially aligned along a length of the hollow shell.

5. The smoking article of claim 4, wherein the axial alignment is substantially a straight line.

6. The smoking article of claim 4, wherein the axial alignment is substantially helical.

7. The smoking article of claim 4, wherein the filaments are aligned in a plurality of rows.

8. The smoking article of claim 1, further comprising a central member extending along the central axis through at least a portion of the length of the hollow shell.

9. The smoking article of claim 8, wherein the filaments are circumferentially positioned around a segment of the central member.

10. The smoking article of claim 9, wherein the filaments are circumferentially positioned around a plurality of segments of the central member.

11. The smoking article of claim 8, wherein the filaments are axially aligned along a length of the central member.

12. The smoking article of claim 11, wherein the axial alignment is substantially a straight line.

13. The smoking article of claim 11, wherein the axial alignment is substantially helical.

14. The smoking article of claim 11, wherein the filaments are aligned in a plurality of rows.

15. The smoking article of claim 1, wherein the filaments are substantially uniform in length.

16. The smoking article of claim 1, wherein the filaments are variable in length.

17. The smoking article of claim 16, wherein the filament lengths define a pattern.

18. The smoking article of claim 1, wherein the wick is operatively positioned within the smoking article to be substantially in contact with the aerosol precursor composition.

19. The smoking article of claim 1, wherein the aerosol precursor composition is in the form of a liquid or gel at ambient conditions.

20. The smoking article of claim 1, wherein the holding member is a reservoir, and wherein the aerosol precursor composition is retained by the reservoir.

21. The smoking article of claim 20, wherein the reservoir is provided in a plurality of segments.

22. The smoking article of claim 21, wherein the wick is provided in a plurality of segments.

23. The smoking article of claim 1, wherein the article comprises a reservoir that is distinct from the holding member, and wherein the aerosol precursor composition is retained by the reservoir.

24. The smoking article of claim 1, further comprising a heater.

25. The smoking article of claim 24, wherein the heater comprises a resistance heating wire.

26. The smoking article of claim 25, wherein the heating wire is at least partially intertwined with the filaments of the wick.

27. The smoking article of claim 25, wherein the heating wire is woven into the filaments of the wick.

28. The smoking article of claim 25, wherein the heater comprises a plurality of resistance heating wires.

29. The smoking article of claim 28, wherein a first heater wire is in contact with a first segment of the wick and wherein a second heater wire in contact with a second segment of the wick.

30. The smoking article of claim 29, wherein the first segment of the wick is adapted to transport a first aerosol precursor material and the second segment of the wick is adapted to transport a second aerosol precursor material.

31. The smoking article of claim 29, wherein the first heater wire and the second heater wire provide differing heating modes.

32. The smoking article of claim 31, wherein the heating modes comprise one or more of heating temperature, heating rate, and total heating time.

33. The smoking article of claim 1, further comprising an electrical power source.

34. The smoking article of claim 33, further comprising a control component.

35. The smoking article of claim 34, wherein the control component comprises a puff-actuated sensor.

36. The smoking article of claim 34, wherein the control component comprises a capacitive sensor.