Smoking article incorporating a conductive substrate

Inactive Publication Date: 2013-10-03
RAI STRATEGIC HLDG INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0026]Heating of the intermediate substrate can be carried out in any suitable apparatus, such as a vacuum oven or a muffle furnace. Heating—i.e., calcining—at an increased temperature can be useful to improve the resistance of the material. It can be preferable for

Problems solved by technology

Smoking articles that employ tobacco substitute materials and smoking articles that employ sources of heat other than burning tobacco cut filler to produce tobacco-flavored vapors or tobacco-flavored visible aerosols have not received widespread commercial success.
Articles that produce the taste and sensation of smoking

Method used

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  • Smoking article incorporating a conductive substrate
  • Smoking article incorporating a conductive substrate
  • Smoking article incorporating a conductive substrate

Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of Conductive Substrates

[0169]Two exemplary conductive substrates were prepared for use in a smoking article according to the invention. In each case, the substrate materials were mixed and extruded to form substrates with a length of 10 mm and a diameter of 4.5 mm (Example 1a) and 4 mm (Example 1b). The formulations and measured resistance for each exemplary substrate are provided below in Table 1. Percentages are provided on a w / w basis.

TABLE 1Resistance of CalcinedExampleFormulation (wt. %)Extrudate (ohms)1aMilled Carbon (64%)2.5Guar Gum (10%)Graphite (20%)Sodium Carbonate (1%)Tobacco (5%)1bCarboxymethyl cellulose (9.5%)2Graphite (90.5%)

[0170]To prepare the substrates in Example 1a and 1b, all particulate ingredients were thoroughly mixed and water was added to yield a dough-like consistency with a moisture content of 39% for example 1a and 24.9% for example 1b (on a w / w basis). The dough was extruded using a batch extruder at a pressure of 10,000 psi (68.95 MPa) to f...

example 2

Effect of Conductive Material Concentration on Electrical Resistance of Conductive Substrate

[0173]To test the effect of the electrically conductive material in the substrate on electrical resistance, multiple conductive substrates were formed (without carbonization) and tested. In general, the conductive substrates were made by extrusion of a mixture of tobacco (a 5:3:2 ratio of flue cured, Burley, and Turkish tobaccos), graphite (from Superior Graphite Company), binder (i.e., carboxymethyl cellulose), and other additives. The exact formulations are provided in Table 2A.

[0174]In each example, the dry ingredients were mixed in a Sigma Blade Mixer (from Teledyne) for approximately one hour at low speed. Liquid ingredients were added to the mix and mixing was continued for an additional 4 hours. Sufficient water was added to ensure that the plastic mix was stiff enough to hold its shape after extrusion. The moisture content of the dough at this stage was about 31-32% (w / w). For extrusi...

example 3

Effect of Calcination on Electrical Resistance of Conductive Substrate

[0177]To test the effect of calcinations on the resistance of the substrate, various substrates were formed using the same methods described in Example 2. The resistance of the substrates was measured before and after undergoing calcination. The formulations, calcination conditions, and resistance values are discussed below. The tobacco blend was 50% flue cured, 30% Burley, and 20% Turkish tobacco by weight unless otherwise indicated.

[0178]3a: Rods of 100 mm length and 4 mm diameter were prepared from a formulation of 19 g tobacco blend, 180 g graphite, 20 g CMC, 1 g copper powder, and 40 g glycerol. The non-carbonized rods exhibited a resistance of about 27 ohms. After calcination at 300° C. for 1 hour, the rods exhibited a resistance of about 3.5 ohms.

[0179]3b: Rods of 10 mm length and 4 mm diameter were prepared from a formulation of 180 g graphite, 20 g CMC, 10 g copper powder, and 40 g glycerol. The non-carbo...

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PUM

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Abstract

The present invention provides a conductive substrate useful for Joule heating, such as in an electronic smoking article. Particularly, the invention provides a resistive heating element formed of a conductive substrate. The conductive substrate comprises an electrically conductive material and a carbonaceous additive, such as a binder material. The conductive substrate is carbonized in that it is subjected to calcining conditions to effectively reduce the carbonaceous additive to its carbon skeleton. It has been found that such carbonized substrate has surprisingly improved resistance properties in relation a substrate of the same formulation that is not carbonized. The carbonized substrate can include an aerosol precursor material. The formed resistive heating element can be included in an electronic smoking article to simultaneously provide resistive heating and aerosol formation with a single, unitary component.

Description

FIELD OF THE INVENTION[0001]The present invention relates to aerosol delivery articles and uses thereof for yielding tobacco components or other materials in an inhalable form. The articles may be made or derived from tobacco or otherwise incorporate tobacco for human consumption.BACKGROUND OF THE INVENTION[0002]Many smoking articles have been proposed through the years as improvements upon, or alternatives to, smoking products based upon combusting tobacco. Exemplary alternatives have included devices wherein a solid or liquid fuel is combusted to transfer heat to tobacco or wherein a chemical reaction is used to provide such heat source. Numerous references have proposed various smoking articles of a type that generate flavored vapor, visible aerosol, or a mixture of flavored vapor and visible aerosol. Some of those proposed types of smoking articles include tubular sections or longitudinally extending air passageways.[0003]The point of the improvements or alternatives to smoking ...

Claims

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Application Information

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IPC IPC(8): A24F47/00A24F15/01A24F40/20A24F40/46A24F40/50A24F40/70
CPCA24F47/008A24F40/46A24F15/01A24F40/50A24F40/70A24F40/20A24F40/30
Inventor GRIFFITH, JR., DAVID WILLIAMCHANG, YI-PINGHENDERSON, CALVIN W.MONTGOMERY, RICKY LEELIEBSCHER, II, WALTER CHARLESBANERJEE, CHANDRA KUMARBRAXTON, PAUL E.SEARS, STEPHEN BENSONBEARD, KENNETH ALLENNESTOR, TIMOTHY BRIANADEME, BALAGERAMPOLINI, FREDERIC PHILIPPEPOTTER, DENNIS LEE
Owner RAI STRATEGIC HLDG INC
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