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Smoking articles comprising inner wrapping strips

a technology of inner wrapping strips and smoking articles, which is applied in the field of tobacco products, can solve the problems of higher self-extinction rates and increase in alkali metal content of inner wrapping strips, and achieve the effect of greater control of the bum characteristics of smoking articles and higher self-extinction rates

Inactive Publication Date: 2007-07-12
R J REYNOLDS TOBACCO COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a smoking article with inner wrapping strips that help control the bum characteristics of the smoking article. The inner wrapping strips are made of an alkali metal salt binder, such as sodium alginate or sodium carboxymethyl cellulose, and have a high alkali metal content, which correlates to higher self-extinction rates. The binder is present in the inner wrapping materials in an amount of about 2 to about 40 weight percent. The inner wrapping strips also may have a second alkali metal additive, such as sodium phosphate, sodium hydroxide, or potassium hydroxide. The smoking article has a minimum ignition temperature of at least about 625°C, which correlates to improved ability to meet certain cigarette extinction criteria. The smoking article may have one or more inner wrapping strips, with a width of about 2 to about 10 mm, and the number of inner wrapping strips can be in the range of 1 to about 8, more preferably 2 to about 5.

Problems solved by technology

It is believed that increases in alkali metal content of the inner wrapping strips correlate to higher self-extinction rates.

Method used

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  • Smoking articles comprising inner wrapping strips
  • Smoking articles comprising inner wrapping strips

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0050] Reconstituted tobacco cast sheet materials with target sodium alginate content ranging from 15% to 35% are made. Cigarettes are made with each sheet material with two split inner wrap strips of 4 mm width. The strips are located longitudinally along the tobacco rod opposite one another and oriented 90 degrees from the side seam. All other cigarette construction details are held constant.

[0051] The sheet materials are tested for sodium content and for ignition temperature (as measured by differential scanning calorimetry). Self-extinction (SE) rates are measured for finished cigarettes by the ASTM E 2187-02b test procedure (20 cigarettes per test). The results from these tests are set forth in Table 1 below, and show a fairly strong correlation between the split inner wrap sodium content and the cigarette self-extinction rate. That is, as the sodium content increases, self-extinction rates increase. The results in Table 1 also show a strong correlation between the sodium cont...

example 2

[0052] This experiment determines if the “alginate anion” content causes some (or all) of the self-extinction rate variation found in Example 1. In this experiment, sheet materials are made with 15% sodium alginate, with additions of 1.5%, 2.5% and 3.5% sodium phosphate. The resulting materials are tested for sodium content and cigarettes are made as described above. The results from these tests are set forth in Table 2 below, and show a small increase in self-extinction rate with the amount of added sodium phosphate. This suggests that the sodium content of the sheet material is moderating the cigarette self-extinction rate. Analysis of the sodium content and self-extinction data in Tables 1 and 2 suggests that the split inner wrap sodium content should exceed about 30,000 μg / g to yield acceptable cigarette self-extinction rates and, thus, reliably conform to current regulations for low ignition propensity cigarettes. The requisite sodium content can be obtained by the use of sodiu...

example 3

[0053] An experiment is conducted to investigate the relationships between cigarette coal temperatures and the split inner wrap ignition temperature. For this work, six cigarette examples are chosen for testing, including five from the list shown in Table 1. Three of these have low self-extinction rates (18%-30%), and low split inner wrap ignition temperatures (558° C.-603° C.). The other three have high self-extinction rates (85%-100%), and high split inner wrap ignition temperatures (649° C.-686° C.). A control cigarette without split inner wrap is also tested.

[0054] Cigarette coal temperatures are measured during smolder while suspended in air, and while resting on the ASTM test substrate (ten layers of Whatman filter paper) using a thermal imaging system comprising an infrared camera (Agema Thermovision 900). The results of these measurements are summarized in Table 3 below. As is evident from the data in Table 3, the coal temperatures are higher during free-air smolder than du...

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Abstract

The present invention is directed to a cigarette comprising a tobacco rod having a smokable filler material contained within a circumscribing outer wrapping material, and one or more inner wrapping strips positioned between the tobacco rod and the outer wrapping material and extending longitudinally along the tobacco rod. The inner wrapping strips comprise a binder in the form of an alkali metal salt and comprise a total alkali metal content of at least about 30,000 μg based on the total weight of the inner wrapping strips. The total alkali metal content can be derived from the alkali metal salt binder alone or a combination of the alkali metal salt binder and a second alkali metal additive. The inner wrapping strips can exhibit an ignition temperature of at least about 625° C. and may comprise 1 to about 8 strips, each strip having a width of about 2 to about 10 mm.

Description

FIELD OF THE INVENTION [0001] The present invention relates to tobacco products, such as smoking articles, and in particular, to cigarettes. BACKGROUND OF THE INVENTION [0002] Popular smoking articles, such as cigarettes, have a substantially cylindrical rod shaped structure and include a charge, roll or column of smokable material, such as shredded tobacco (e.g., in cut filler form), surrounded by a paper wrapper, thereby forming a so-called “smokable rod” or “tobacco rod.” Normally, a cigarette has a cylindrical filter element aligned in an end-to-end relationship with the tobacco rod. Typically, a filter element comprises plasticized cellulose acetate tow circumscribed by a paper material known as “plug wrap,” and is attached to one end of the tobacco rod using a circumscribing wrapping material known as “tipping paper.” It also has become desirable to perforate the tipping material and plug wrap, in order to provide dilution of drawn mainstream smoke with ambient air. Descriptio...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D21F11/00
CPCA24D1/025
Inventor MUA, JOHN-PAULARZONICO, BARBARA WALKERCLARK, MELISSA ANNMONSALUD, LUIS ROSETE JR.NORMAN, ALAN BENSONSCHLUTER, RODNEY DEAN
Owner R J REYNOLDS TOBACCO COMPANY
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