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Smoking article incorporating a conductive substrate
Inactive Publication Date: 2013-10-03
RAI STRATEGIC HLDG INC
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Summary
Abstract
Description
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Benefits of technology
The patent is about heating a material to improve its resistance. This can be done in a vacuum oven or a muffle furnace. The temperature should be between 200°C and 1,200°C. It is preferable to do the heating in an inertatmosphere, like nitrogen. The technical effect of this patent is to provide a way to make materials more durable and resistant to damage.
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 by electrically heating tobacco particularly have suffered from inconsistent release of flavors or other inhalable materials.
Electrically heated smoking devices have further been limited in many instances to the requirement of an external heating device that was inconvenient and that detracted from the smoking experience.
Method used
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Examples
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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.
[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 copperpowder, 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 copperpowder, and 40 g glycerol. The non-carbo...
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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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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
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