JPH04228059A - Cigerette - Google Patents

Abstract

PURPOSE: To provide a cigarette with which the quantity of 'tar' in side current to be generated in case of smoking is reduced and smoldering under smoking is maintained on FTC smoking conditions at least. CONSTITUTION: The filling of a smokable material 20 or the outer peripheral surface of a roll is wrapped by a 1st wrapping material 25 and the outer peripheral surface of the 1st wrapping material is wrapped by a 2nd wrapping material 27 so that a smokable material rod is formed. Concerning the cigarette composed of such as rod, the 1st wrapping material contains the base material of tobacco and an inorganic filling material, and the 2nd wrapping material contains a cellulose base web and an inorganic filling material and has peculiar air permeability almost lower than 15 for the unit of cholesta as its feature. The 1st wrapping material contains a carbonic material in its base material and contains aqueous salt (combustion altering agent), the 2nd wrapping material contains the filling material of magnesium hydroxide and its net air permeability is set almost higher than 40 for the unit of cholesta. Smoldering on the FTC smoking conditions is excluded and further, the quantity of visible side current smoke to be generated is extremely reduced.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a cigarette that burns tobacco material, and in particular, the present invention relates to a cigarette that burns tobacco material.
The present invention relates to a cigarette that has a low amount of "tar" and maintains smoldering during smoking at least under FTC smoking conditions. Here, "FTC smoking conditions" refers to a 2-second inhalation action or puff (total volume 3
5 ml). A "puff" is a puff of tobacco smoke that is inhaled.

0002

BACKGROUND OF THE INVENTION Common smoking articles such as cigarettes have a structure in the form of a cylindrical rod and are wrapped with a paper wrap to form a so-called "tobacco rod". A roll or charge of smokable material, such as shredded tobacco material (e.g., tobacco shred replenishment). "Replenishment fee" refers to the contents of a cigarette or cigar. "Tobacco shredded replenishment" refers to replenishment made of shredded tobacco, and is also simply referred to as "shredded tobacco replenishment." Typically, cigarettes have a cylindrical filter element coupled in abutting relationship to a tobacco rod. in general,
The filter element consists of a tow of cellulose acetate wrapped with a plug (filter) wrap and attached to the tobacco rod by an outer wrapper tip. It is also desirable to have perforations in the tip material and plug wrap to dilute mainstream smoke drawn through the cigarette with ambient air. Typically, a smoker draws mainstream smoke into his or her mouth by lighting the tip of a cigarette to burn a tobacco rod and drawing from the mouth end (eg, filter end) of the cigarette. Cigarettes continue to burn even when the smoker is not inhaling, producing sidestream smoke. Sidestream smoke is smoke that is emitted directly into the atmosphere from the lit end of a cigarette. Sidestream smoke diffuses into the atmosphere and its distinctive visible characteristics and odor may be perceived and disliked by surrounding people. Accordingly, there is a desire among cigarette smokers for cigarettes that have low levels of visible sidestream smoke.

The relative amount of visible sidestream smoke produced by a burning cigarette is related to the amount of sidestream "tar" released from the burning cigarette. A typical cigarette with an overall length of about 84 mm (e.g., tobacco rod length of about 57 mm, filter element length of about 27 mm) that burns tobacco cut refill typically has a side stream of about 25 mg to about 35 mg.
Generates tar. For the method and apparatus for measuring the side stream "tar" of cigarettes, see "Analyst" edited by Proctor et al., 1988, Vol. 113, p. 1509.

A number of cigarettes have been proposed in the past that purport to produce relatively low levels of visible sidestream smoke. Such cigarettes are disclosed, for example, in U.S. Pat. No. 4,108
, No. 151, No. 4,225,636, No. 4,231,37
No. 7, No. 4,407,308, No. 4,420,002,
No. 4,450,847, No. 4,461,311, 4,5
No. 61,454, No. 4,624,268, No. 4,637,
No. 410, No. 4,805,644, No. 4,881,557
No. 4,915,118, No. 4,924,888, 4
, 941,485, 4,998,541, and European Patent Application No. 402,059.

[0005]

SUMMARY OF THE INVENTION The present invention (i) provides good smoking satisfaction, (ii) is capable of maintaining smoldering at least under FTC smoking conditions, and (iii)
It is an object of the present invention to provide a cigarette that emits a good aroma and taste, with a small amount of sidestream "tar" discharged, and therefore a small amount of visible sidestream smoke generated.

[0006]

[Means for Solving the Problems] In order to solve the above problems, the present invention generates a good tobacco flavor, gives pleasure and satisfaction in smoking, and has a comparatively low amount of side stream "tar". Provide low-quality cigarettes. This cigarette is
Furthermore, the amount of visible sidestream smoke generated is extremely small, and the odor of sidestream smoke is also low. Cigarettes of the present invention (i) are not unduly heavy; (ii) have acceptable ash and fire cone formation; (iii) have acceptable smoldering characteristics; and (iv) have acceptable smoldering properties. It has a burning rate of Additionally, the cigarette (i) burns uniformly backwards (from the tip to the mouth end) during use, and (ii) produces visible stains on the outer wrap immediately behind the burn line during use. Never. A preferred cigarette of the present invention burns slowly during resting and smoldering, burns a relatively small amount of smokable material, and can maintain smoldering.

The cigarette of the present invention has a roll or charge of smokable material wrapped with two layers of outer wrap to form a so-called "tobacco rod." That is, the cigarette of the present invention comprises a first (i.e., inner) wrap that directly envelops the roll or charge of smokable material, and a second (i.e., outer) wrap that encloses the first wrap. Contains two layers of outer wrap material. The smokable material is a smokable refill consisting of tobacco cut refill. Typically, the smokable material will consist solely of tobacco shred replenishment, which tobacco shred replenishment is preferably cased and/or topdressed.

The second or outer layer of wrap material surrounding the roll of smokable material is a paper wrap that has a low inherent air permeability. Wrap materials with low intrinsic air permeability, ie, low porosity, generally have a porosity, or air permeability (hereinafter also simply referred to as "permeability") of about 15 CORESTA units or less, and are usually , having a porosity or air permeability of less than about 10 Coresta units, often less than about 8 Coresta units, and often less than about 5 Coresta units. Coresta unit is 1 cm2 under constant pressure of 1 centibar
is a measure of the linear air velocity passing through a wrap of area. Regarding the Coresta unit, please refer to "Coresta Public Relations" ISO/T
C 126/SC I N159E (1986)
Please refer to It is very important that the second (i.e., outer) wrap material has a net porosity that is greater than the inherent porosity of the wrap material, especially if the wrap material contains magnesium hydroxide as a filler. preferable. Typically, the second wrap material is perforated, such as by electrostatic drilling, to provide a net porosity of about 50 to about 225 Coresta.

It is highly preferred that the first (ie, inner) wrap material directly encasing the roll or charge of smokable material is paper containing tobacco material. Preferably, the first wrap material has a sufficient amount of at least one salt additive to serve to maintain the static smoldering of the tobacco rod, at least when smoked under FTC smoking conditions. Such salts include substantially water-insoluble inorganic salts, such as
particles of calcium carbonate), a water-soluble inorganic salt (eg, potassium chloride), or a water-soluble salt (eg, potassium citrate). Mixtures of substantially water-insoluble and water-soluble salts may also be used. Also, the first wrap material may contain a carbonaceous material. The first wrap material is
It is highly preferred to have an intrinsic air permeability of about 30 Coresta units or greater, and the perforations may be perforated to provide a net porosity greater than the intrinsic porosity.

[0010] Preferred cigarettes of the invention include a filter element that functions as a mouthpiece. Such cigarettes may be manufactured, for example, by perforations in the part of the chip material encasing the filter element, or by other air dilution means (introducing air to dilute the mainstream smoke with air). Air dilution means can be provided by providing a means for It is usually preferred to use filter elements of moderate or low efficiency. Regarding filter elements, see "Chemistry of Tobacco and Tobacco Smoke" (1) by Keith.
972), page 157. Typically, the filter element will have a permeability such that the air dilution of the cigarette will be in the range of about 25-75%. "Air dilution" here refers to the total amount of air and smoke that is inhaled through the cigarette and flows out from the mouth end of the cigarette.
The percentage (usually expressed as a percentage) of the amount of air drawn through the air dilution means. Regarding this, see "Beitr. Zur Tabak. In." by Selke et al.
(1978), Vol. 4, p. 193.

[0011]

[Example] A preferred embodiment of the cigarette of the present invention is as follows:
It is shown in FIG. This cigarette 10 includes a smokable (smokable) supplement (hereinafter also simply referred to as "smokable material") 20 which is covered with a first or inner wrapping material 25, and a first or inner wrapping material 25. The outer peripheral surface of the material 25 is
, having a cylindrical rod 15 of smokable material formed by being wrapped by an outer wrapping material 27 . For convenience, the rod 15 will be referred to as a "smokable material rod" or a "tobacco rod." Both ends of the tobacco rod are open to expose the smokable material. First wrap material 25
and the second wrap material 27 are in direct contact with each other, that is, the inner surface of the outer wrap material 27 is in contact with the outer surface of the inner wrap material 25. The cigarette 10 also includes a filter element 30 disposed in axial alignment with one end of the tobacco rod 15, preferably in abutting relationship. Filter element 30 is cylindrical and has a diameter substantially equal to the diameter of the tobacco rod. Filter element 30 consists of plasticized cellulose acetate tow 35 or other suitable filter material 35 and plug wrap 40 surrounding its outer circumferential surface. Both ends of filter element 30 are open to allow air and smoke to pass through.

The filter element 30 has a tip material (
It is attached to the tobacco rod by a mouthpiece attaching wrap material 45. The inner surface of tip material 45 is secured to the outer surface of plug wrap 40 and the outer surface of tobacco rod wrap 27 using a suitable adhesive. This cigarette is
Ventilation, i.e. air, with air dilution means (means for introducing air in order to dilute the tobacco smoke with air), for example a series of perforations 50, drilled in the tipping material 45 and the plug wrap 40. It is a diluted smoking article.

Referring to FIGS. 1 and 4, the second
The wrap material 27 has a width W (FIG. 4) equal to the sum of the circumference of the cigarette and the overlap margin in the longitudinal direction where the wrap material is rolled and glued during cigarette manufacturing. The wrap is preferably provided with a series of perforations 60 arranged linearly along its length. Alternatively, the perforations may be in other alignment patterns, such as irregular alignment. The size and number of perforations 60 and the relative positional relationship of each perforation can be changed depending on the characteristics to be imparted to the cigarette. Perforation 60 is shown enlarged in FIGS. 1 and 4.

Referring to FIG. 2, the smokable material 2
0 is covered by a first inner wrapping material 25, and the first wrapping material is covered by a second outer wrapping material 27. The first wrap material 25 is formed into a cylindrical shape by rolling it so that both side edges 71 and 72 of the first wrap material abut against each other. The both side edges 71 and 72 of the wrap material 25 are (second
They may abut each other, nearly abut each other (as shown in the figure), or may overlap slightly. The second wrap material 27 is fixed at overlapped portions 73 on both side edges thereof with a suitable adhesive. Therefore, the width of the inner wrap 25 is smaller than the width of the outer wrap. Tobacco rods having such a configuration are manufactured by using a suitably equipped cigarette making machine to supply paper wrap materials from two bobbins, place the inner wrap material on top of the outer wrap material, and then use the two wrap materials to produce cigarettes. It can be formed by passing it through a machine. Various other types of machines for producing cigarettes in this manner are known.

Referring to FIG. 3, the smokable material 2
0 is covered by a first inner wrapping material 25, and the first wrapping material is covered by a second outer wrapping material 27. The first wrap material 25 is formed into a cylindrical shape by rolling it up and bonding overlapping portions 74 on both side edges thereof with an adhesive. The second wrap material 27 has overlapping portions 7 on both side edges thereof.
At 6, it is fixed with a suitable adhesive. A tobacco rod having such a configuration can be formed using a well-known cigarette manufacturing machine.

Various types of smokable materials can be used in manufacturing the tobacco rods of the present invention. for example,
The smokable material may be in the form of a refill (eg, a tobacco shred refill). As used herein, the term "filler" or "chop filler" as used in connection with smokable material refers to a variety of smokable materials having a form suitable for use in the manufacture of tobacco rods for cigarettes. means. Examples of cut fillers include various smokable materials that have been blended and put into a form suitable for making cigarettes. Such smokable material is usually used in the form of strands or shreds, which are conventionally used in the manufacture of cigarettes. For example, the cut filler can be used in the form of strands or pieces cut from sheet or strip material. Such strip material may be about 1/20 to about 1/60 in., preferably about 1/25 to about 1/60 in.
Cut to a width of approximately 1/35 inch. Generally, such strands or shreds have a length of about 6.35 m to about 76.2 m.
m (about 0.25 to about 3 inches).

Examples of suitable tobacco materials are hot air-cured tobacco, Burley, Oriental or Maryland tobaccos or so-called rare or specialty tobaccos, or blends thereof. These tobacco materials include tobacco leaf pieces, processed tobacco materials such as expanded tobacco materials, processed tobacco materials such as shredded and rolled tobacco stalks or shredded and expanded tobacco stalks, and reconstituted tobacco stalks. It can be supplied as tobacco material or a blend thereof. Examples of reconstituted tobacco materials are described in US Pat. No. 4,987,906 and European Patent Application No. 419,733. Examples of processed tobacco materials are described in European Patent Application No. 412,768. Examples of tobacco blends are shown in U.S. Pat.
No. 924,888 and No. 4,942,888. Preferably, the smokable material consists primarily or solely of tobacco cut replenishment.

[0018] Such smokable material may be subjected to casing or top dressing treatments as conventionally practiced at various stages of cigarette manufacture. Thus, a casing or top dressing can be added to the smokable material, especially the tobacco cut refill. For example, blending ingredients such as flavorants and humectants, and other forms of tobacco material (e.g., tobacco extract) can be added to the smokable material, as is commonly practiced in cigarette manufacturing. Regarding flavoring agents, see “Tobacco Flavoring Agents for Smoking Articles” by Leffingell et al.
(1972). Suitable flavoring agents and tobacco materials include vanillin, tobacco extracts such as tobacco essence and tobacco aroma oil, cocoa, licorice, menthol, and the like. Further, a flavor modifier such as levulinic acid is added in an amount of about 0.01 to about 2%, usually about 0.01%, based on the dry weight of the smokable material.
It can be added to the smokable material in a proportion of 1 to about 1%, preferably about 0.2 to about 0.6%. Such ingredients are
It can be conveniently applied to smokable materials as a casing or top dressing. See US Pat. No. 4,830,028 in this regard.

[0019] Typically, the tobacco rod is about 35 mm to about 8 mm.
5 mm, preferably about 40 mm to about 70 mm, and about 17 to about 27 mm, preferably about 22.5 to about 2
It has a circumference of 5mm. Particularly when smokable blades with a relatively high packing density are used as smokable material.
Short tobacco rods (ie, tobacco rods from about 30 mm to about 50 mm in length) can be used.

As used herein, "packing density" refers to the weight of smokable material per unit volume within the tobacco rod. The packing density of the blades of smokable material covered by the wrap material can be of varying degrees, but in the case of the tobacco rods of the cigarettes of the present invention, the packing density is about 15
0 to about 300 mg/cm3, usually in the range of about 200 to about 280 mg/cm3.

The second or outer wrap material 27 is a cigarette wrap material having a low inherent air permeability. Here, "specific air permeability" refers to the porosity of the wrap material itself that allows air flow to pass through. For example, cigarette wraps with low intrinsic air permeability are less than about 15 Coresta units, typically about 1
It has an inherent air permeability of less than 0, generally less than about 8, sometimes less than about 5, often less than about 3, and often less than about 1. Cigarette wraps of this type consist of a cellulosic base web (e.g. obtained from wood pulp and/or flax fibers) and an inorganic filler (e.g. particles of magnesium hydroxide and/or calcium carbonate). has.

The second wrap material has a relatively high net transmittance (
For example, it is preferable to process the material so that it exhibits about 40 or more Coresta units, preferably about 50 or more Coresta units. here,
"Net permeability" refers to the airflow permeability or porosity of the perforated wrap material used to manufacture tobacco rods. Typically, the air permeability of the wrap is imparted by microlaser perforation or mechanical or electrostatic perforation. When using microlaser perforation or electrostatic perforation, care should be taken to maintain the desired color and opacity of the paper wrap. For example, avoid burning the plastic wrap. For example, in the case of the second wrapping material having a low specific transmittance, about 50 to about 225 Coresta units, preferably about 80 to about 225 Coresta units are used.
The second wrap material is perforated (e.g., by conventional electrostatic perforation) to provide a net permeability or porosity of about 180, more preferably from about 90 to about 120. Individual perforations of comparable size to the resulting perforations) can be drilled.

The size of the individual (individually separated) perforations that impart high net permeability to the second or outer wrap material is typically determined by the pores naturally present in the paper wrap material (ie, the inherent pores of the paper). The pores that determine the transmittance) should be made larger. However, in order to improve the appearance, it is preferable to make the individual perforations as small as possible so as not to make them unsightly. For example, it is preferred that the perforations be unobtrusive and, in most cases, barely visible to the naked eye.

Typical outer wrap materials range from about 50 to about 75
The paper wrap includes, by weight, from about 55 to about 70 weight percent cellulosic material and from about 25 to about 50 weight percent, preferably from about 30 to about 45 weight percent, inorganic filler. It is desirable for the paper wrap to include a filler of magnesium hydroxide, often about 5% by weight or more, and often about 7% by weight or more. about 8 to about 35% by weight, often about 10 to about 30%, sometimes about 20 to about 30% by weight
A paper wrap material containing magnesium hydroxide is preferred. Examples of suitable wrap materials include U.S. Pat.
Nos. 50,847, 4,915,118 and 4,881
, No. 557. Also preferred are wraps containing other inorganic fillers such as calcium carbonate. In such cases, paper wraps containing from about 5 to about 35 weight percent, often from about 10 to about 20 weight percent calcium carbonate are preferred. The wrap material may also contain other materials such as magnesium oxide particles, calcium sulfate fibers, and carbonaceous material particles. Also preferred are paper wraps containing flax fibers, wood pulp or other cellulosic materials to constitute the cellulosic base web. Preferred paper wraps containing magnesium hydroxide filler have a relatively high basis weight. Typical basis weight is at least about 30g/m2, often about 40g/m2, unusually about 45g/m2
/m2. Normally, the basis weight of paper wrap material is 80
g/m2.

[0025] The second one has a significant presence of magnesium hydroxide.
The paper wrap material preferably contains at least one type of water-soluble alkali metal salt. Examples of water-soluble alkali metal salts are potassium malate, potassium acetate, potassium nitrate, potassium citrate, potassium chloride, potassium succinate, potassium propionate, potassium formate, etc., and mixtures thereof. Preferably, at least a portion of the alkali metal is provided in the form of a salt which exhibits very low hygroscopicity. The water-soluble alkali metal salt can be incorporated into the second paper wrap material in various ways. The water-soluble alkali metal salt may be incorporated into the second paper wrap during its manufacturing process, or by a size press method well known to those skilled in the art.
It may be added to the second paper wrap material using a printing method, a painting method, or the like. It is highly preferred that the water-soluble alkali metal salt is substantially uniformly contained in the second paper wrap. A plurality of water-soluble alkali metal salts can be incorporated into the paper wrap simultaneously, in different processing steps, or after the second paper wrap is produced.

[0026] The amount of water-soluble alkali metal salt contained in the second paper wrap material having the magnesium hydroxide filler can be determined in various ways, but it is usually per gram of the dry base web of the wrap material. The amount will provide at least 10 mg, generally at least 30 mg, of water-soluble alkali metal ion. The amount of water-soluble alkali metal salt contained in the second paper wrap will typically provide at least 35 mg, and often at least 40 mg, of water-soluble alkali metal ions per gram of dry base web of the wrap. and in an amount to provide less than about 90 mg, often less than about 80 mg, of water-soluble alkali metal ions. The amount of potassium ions in the second paper wrap is significantly greater than the amount of sodium ions in the paper wrap. In detail,
The weight ratio of potassium ions to sodium ions is
greater than about 100:1, preferably greater than about 150:1, and more preferably greater than about 200:1.

The second paper wrap with magnesium hydroxide filler is preferably coated with at least one organic acid in non-free form. This organic acid is usually applied to the manufactured second paper wrap material using a size press method or a printing method. Examples of organic acids include maleic acid, citric acid, levulinic acid, fumaric acid, oxalic acid, tartaric acid, and blends thereof. Often, the organic acid is applied to the second paper wrap by dissolving or dispersing it in alcohol or water and applying the resulting solution or dispersion to the manufactured second paper wrap. preferable. Typically, the second paper wrap material contains about 0.2% or more, preferably about 0.3% or more, more preferably about 0.2% or more, based on its dry weight.
A sufficient amount of organic acid is applied to the second paper wrap to provide a paper having 4% or more organic acid. Typically, the amount of organic acid applied to the second paper wrap will be less than about 6%, and generally less than about 4%, based on the dry weight of the second paper wrap. The organic acid is applied to the second paper wrap in non-free (i.e., acid) form, although some amount of the organic acid in free (i.e., salt) form may be present in the second paper wrap. . Here, the term "non-free" in relation to organic acids means that the acid is a salt (e.g.
means not in the form of sodium, potassium, calcium or magnesium salts). The organic acid can be included in the second paper wrap material together with the alkali metal salt. For example, potassium hydroxide can be brought into contact with a stoichiometrically excessive amount of maleic acid, and the resulting aqueous solution of malic acid can be applied to the wrap material using a size press. at least about 0.4% by weight, preferably about 1% by weight or more,
Most preferably about 2% or more by weight of malate ions (e.g., provided as potassium malate and maleic acid)
It is preferable that the second paper wrap material contains the following.

[0028] Optionally, at least one sugar can be applied to the second wrapping material comprising magnesium hydroxide. Examples of such sugars are sucrose, glucose, fructose, glucose, and maltose. The sugar is typically applied to the manufactured second paper wrap using a size press or printing method. Often, the sugar is applied to the second paper wrap by dissolving it in water (e.g., with the alkali metal salts mentioned above) and applying the resulting solution to the manufactured second paper wrap. It is preferable. If sugar is used, the amount may be up to about 12%, preferably about 0.5 to about 8%, more preferably about 1 to 5%, based on the dry weight of the second paper wrap. do.

As a suitable commercially available second paper wrap material, for example, Ecsta Experimental Paper No. 1 manufactured by Ecsta Corporation. TOD 05504, TOD 05405,
TOD05273, TOD 05275, TOD
05375, TOD 05759, TOD 057
21, TOD 05560, TOD 05505,
TOD 05386, TOD 05390, TOD
05422, TOD 05387, TOD 0
5551, TOD 05151, TOD 0536
There are 5.

Another suitable commercially available second paper wrap material includes:
There is a cigarette paper whose main ingredients are calcium carbonate and flax. As this type of second paper wrap material, Kimbari
P-2123-0101 and P-212 manufactured by Clark
3-010, and Standard No. 3-010 manufactured by Ecsta Corporation. TOD03816 is commercially available. Also suitable are cigarette wrappers made from wood pulp and inorganic fillers such as calcium carbonate. An example of such paper is P, available commercially from Kimberly-Clark.
There is -2540-21. It may be preferred that the second wrap material include a sufficient amount of at least one film-forming polymeric material to exhibit a desirably low intrinsic air permeability. For example, about 10 Coresta units
A paper wrap having an air permeability of about 30 is provided with sufficient air permeability to give it an inherent air permeability of less than about 8, sometimes less than 5, often less than about 3, and often less than about 1 in Coresta units. amount of film-forming polymeric material can be applied. Similarly, relatively low air permeability (e.g.
a film-forming polymeric material in an amount sufficient to further reduce the inherent air permeability of the paper wrap (e.g., less than about 5 Coresta units, often less than about 1 Coresta units); An aqueous solution of can be applied. Examples of film-forming polymeric materials include sodium carboxymethyl cellulose (SCMC) and low viscosity ammonium alginate. An example of the second paper wrap material is P-25, which is commercially available from Kimberly-Clark.
It is 40-83. This wrap material is approximately 32g/m2
3.4% by weight of sodium carboxymethylcellulose so that the final specific air permeability is less than about 0.7 Coresta units. is added. Another example of a second paper wrap material is P-2540-82, available from Kimberly-Clark. The wrap material has a basis weight of about 32 g/m2, an initial air permeability of less than about 6 Coresta units, and a final specific air permeability of less than about 2.7 Coresta units. 1.6% by weight of sodium carboxymethylcellulose was added. Yet another example of a second paper wrap material is P-2540-81, available from Kimberly-Clark. This wrap material is approximately 32
g/m2 and an initial air permeability of less than about 6 Coresta units, with a final specific air permeability of less than about 1.7 Coresta units. Added sodium carboxymethylcellulose. It has a basis weight of approximately 32g/m2,
Has an air permeability of less than about 2 Coresta units and about 1% by weight
Examples of other second paper wrap materials include low viscosity ammonium alginate or sodium carboxymethyl cellulose and about 4 to about 7 weight percent potassium citrate, such as P-283, available from Kimberly-Clark.
0-60-1, P-2831-102, P-2831-
140, P-2831-179, P-3122-23 and P-3122-40. Yet another example of a second paper wrap material is P-
3122-4-1. This wrap material is approximately 32g/
m2 and has an initial air permeability of less than about 6 Coresta units, with 1.1% by weight of sodium carboxymethylcellulose added to give a final specific air permeability of about 1 Coresta units. It is what was done. Other examples of second paper wrap materials include P-2831-149 and P-2, commercially available from Kimberly-Clark.
831-189-B1-6606, P-2831-18
9-B2-6606 and P-2831-189-B3-
There is 6606. These wraps may contain flammability modifiers. The amount of flammability modifier will normally not exceed about 10%, and generally will be about 0.25% or more, based on the dry weight of the wrap. Examples of flammability modifiers include potassium citrate, potassium acetate,
There are potassium nitrate and potassium succinate. Methods of applying such salts to wrap materials will be apparent to those skilled in the art. If desired, a sizing agent and a wet strength agent, such as Hercules Incorporated's Harcon 70 or Aquapel, can be applied to the second wrap. Also, if desired, various types of flammability modifying additives and polymeric materials can be applied to the second wrap material, each separately or together as a mixture. These paper wraps can also be perforated, for example by electrostatic perforation, in order to achieve a desired net transmittance.

If desired, the second paper wrap material can contain flavorants and/or flavor and aroma precursors (eg, vanillin glucoside and/or ethyl vanillin glucoside). This is discussed in U.S. Patent No. 4,941.
, No. 486.

Most preferably, the first or inner wrap material is comprised of tobacco material. It is highly preferred that the first wrap material contains a certain amount of an inorganic filler (eg, calcium carbonate) and/or a water-soluble salt (eg, potassium citrate). In addition, the first wrap material includes
Carbonaceous material can be contained. The intrinsic transmittance of the first wrap material may vary, but is typically higher than the intrinsic transmittance of the second wrap material, and is often significantly higher than the second wrap material. Typically, the final specific transmittance of the combination of the first wrap material and the second wrap material is slightly lower than the specific transmittance of the second wrap material;
When the difference in the specific transmittance between the first wrap material and the wrap material is relatively large, the effect of the first wrap material in reducing the total final specific transmittance of both wrap materials is small. The intrinsic transmittance of the first wrap material can be close to 1,000 Coresta units, but is generally greater than about 30 Coresta units, often greater than about 50 Coresta units, and often greater than about 100 Coresta units. 1st
The wrap material can be perforated, for example by electrostatic perforation, to achieve the desired net permeability.

A variety of wrap materials can be used as the first or inner wrap material. One example is P-2540-
94-C. This is a paper consisting of about 29% by weight of activated carbon particles obtained from coconut shells and about 71% by weight of tobacco pieces and has a permeability of about 250 Coresta units. Another example of a first wrap material is P-254, also available from Kimberly-Clark Corporation.
It is 0-94-D. This is a paper consisting of about 50% by weight of activated carbon particles obtained from coconut shells and about 50% by weight of tobacco pieces and has a permeability of about 380 Coresta units. Yet another example of the first wrap material is P-25, commercially available from Kimberly-Clark Corporation.
40-136-C. It is a paper made from wood pulp, hot air-dried Burley tobacco petioles, and particles of carbonized hardwood, having a basis weight of about 47 g/m2 and an inherent permeability of about 14 Coresta units. It is. Yet another example of the first wrap material is P-31224-
It is 4. This contains approximately 20% by weight of wood pulp and approximately 3% by weight of wood pulp.
0% by weight of Turkish tobacco strips, about 30% by weight of "American Blend" in the form of chopped filler, and about 20% by weight of calcium carbonate particles, so as to exhibit a net permeability of about 150 Coresta units. This paper is perforated using electrostatic perforation. Yet another example of a first wrap material is P-2831-189-AA4, available from Kimberly-Clark Corporation. This is about 20
60 g/m The paper has a basis weight of , and an inherent transmittance of about 125 Coresta units. 1st
Yet another example of a wrap material is P-2540-107, available from Kimberly-Clark Corporation.
-A, P-2540-107-B, P-2540-10
7-C and P-2540-107-D. These consist of carbonaceous material, wood pulp and tobacco petioles,
The paper has a basis weight of about 45 to about 70 g/m@2 and a porosity of about 60 to about 150 Coresta units. 1st
Other examples of wrap materials include Kimberly-Clark
P-2540- commercially available from Corporation
155, P-2540-136-D, P-2540-1
36-E, P-2540-152, P-2540-15
2, P-2540-150, P-2540-157, P
-2540-151, P-2540-156, P-25
40-197-A10, P-2540-94-A, P-
144-KC-G, P-144-RB, P-144-K
CL, P-144-SN20, P-144-BHC, P
-2647-157-A5116, P-2831-13
0, P-2831-22-1, P-2831-23-3
, P-1976-25-1, P-1976-25-2 and P-1976-25-3.

The most preferred second wrapping material is tobacco-containing paper. Tobacco material-containing paper is made of tobacco material pieces (e.g.
tobacco petioles, tobacco fine powder, tobacco petiole strips, tobacco powder, tobacco cutting supplements, tobacco strips, tobacco leaves, processed tobacco petioles, tobacco scraps and/or tobacco extracts). Preferred tobacco-containing papers are those containing cellulosic portions of tobacco, and may also contain one or more tobacco extracts. The paper containing tobacco material containing a cellulosic component preferably contains tobacco material as the cellulosic component. In addition to the cellulosic component (eg, wood pulp), water-soluble salts and inorganic fillers (eg, calcium carbonate and/or magnesium hydroxide) can also be added to the first wrap material. Methods for manufacturing such paper will be apparent to those skilled in the art.

Certain preferred tobacco material-containing first wrap materials include about 25% by weight or more, usually about 50% by weight or more,
Preferably, it contains about 50 to about 85% by weight of tobacco material. Additionally, certain preferred first wrap materials include up to about 50% by weight, preferably from about 20 to about 50% by weight, of cellulosic material. Examples of useful cellulosic materials include wood pulp, hardwood pulp, and flax fibers. Such wraps may also include up to about 35%, preferably up to about 25%, more preferably up to about 20% inorganic filler by weight. Examples of inorganic fillers include calcium carbonate particles, calcium sulfate fibers, calcium sulfate particles,
Mention may be made of magnesium oxide, magnesium hydroxide, and the agglomerated fillers described in European Patent Application No. 419,733. Certain preferred first wrap materials include about 5% by weight or more of magnesium oxide and/or hydroxide filler. Such wraps also contain up to about 10% by weight, preferably about 6% by weight, and most preferably about 1 to about 3% by weight of at least one added salt (e.g., a water-soluble salt). can be done. Such added salts can function as flammability modifiers. Examples of such additive salts include inorganic salts (e.g. potassium chloride and potassium nitrate) and inorganic cations (e.g. potassium citrate, potassium acetate,
potassium propionate and potassium succinate). Such a wrap can be perforated, for example by electrostatic perforation, to provide a higher porosity than its inherent porosity, if desired.

Certain preferred first wrap materials include from about 65 to about 85 parts by weight tobacco material and from about 15 to 35 parts by weight soft pulp. Such tobacco-containing wraps may have high or low air permeability and may contain high or low levels of added salt (flammability modifiers). (e.g., potassium succinate or potassium citrate), and may contain high or low levels of inorganic fillers and, if desired, perforations may be drilled, e.g., by electrostatic drilling. can.

The first wrap material typically contains a flammability modifier (eg, at least one water-soluble salt additive). Typically, the amount of flammability modifier will not exceed about 10%, based on the dry weight of the wrap, but typically
It should be more than about 0.25%. In certain wrap materials, especially those containing relatively high levels of aqueous tobacco extract, the addition of flammability modifiers may be minimal or The addition may be zero. In particular, approximately 25% based on the dry weight of the wrap material.
% or more, usually about 30% or more, of aqueous tobacco extract can be used without the addition of flammability modifiers.

The carbonaceous material (ie, material consisting primarily of carbon) that is optionally included in the first wrap material can be of various types. Carbonaceous materials are flammable under the temperature conditions during cigarette smoking. The most preferred carbonaceous materials are those obtained from natural cellulosic materials. Certain natural cellulosic materials have high cellulose content (i.e., greater than about 80% cellulose content by weight).
and often have a high α-cellulose content (ie, greater than about 80% by weight α-cellulose content). Examples of natural cellulosic materials that can be pyrolyzed into combustible carbonaceous materials include tobacco wood, soft wood pulp, hard wood pulp, coconut shells, kapok fibers, cotton fibers, cotton linters, and combinations thereof. Can be mentioned. Typical combustible carbonaceous materials are obtained by pyrolyzing natural cellulosic materials under an inert atmosphere at temperatures of about 600 to about 1200<0>C, preferably about 650 to about 850<0>C. Preferred carbonaceous materials contain at least about 80% by weight carbon, and typically from about 85% to about 95% by weight carbon. Examples of carbonaceous materials are disclosed in European Patent Application No. 236,992, US Pat. No. 4,991,596 and European Patent Application No. 419,733.

The amount of carbonaceous material that can be optionally included in the first wrap material can vary. If the second wrap material has a relatively low porosity, the first wrap material should contain a relatively high proportion of carbonaceous material or contain a carbonaceous material prepared at a relatively high pyrolysis temperature. let Usually, the amount of carbonaceous material that can be contained in the first wrap material is about 5% or more, usually about 10% or more, generally about 20% or more, and often about 30% or more, based on the weight of the wrap material. % or more, usually about 4
It is 0% or more. Although the carbonaceous material can have various forms, it is usually in the form of powder or granules with a diameter of about 5 to about 20 microns. Also, the amount of carbonaceous material that can be optionally included in the first wrap material relative to the total weight of the tobacco rod can vary. The content of carbonaceous material in the first wrap material is about 2% or more, often about 2% to about 8%, and often about 3% to about 7%, based on the total weight of the tobacco rod. . Second
If the wrap material has a very low porosity (less than about 2 Coresta units), the content of carbonaceous material in the first wrap material is usually a relatively high percentage (based on the total weight of the tobacco rod). 5% or more).

[0040] Certain flavoring agents may be included in the first wrap material or otherwise supported by the first wrap material. In particular, carbonaceous materials, which can optionally be included in the first wrap, can be utilized as particularly suitable substrates for certain flavorings. Examples of suitable flavoring agents include menthol, vanillin, and the like. Suitable flavoring agents include Tobacco Flavoring Flavors for Smoking Articles by Leffingell et al. (1972).
It is described in. Carbonaceous materials are particularly suitable substrates for volatile flavorings. If desired, the first paper wrap material can contain flavor and aroma precursors.

[0041] Typically, the filter element is about 15 to about 35 m long.
m, preferably having a length of about 25 to about 30 mm, and about 1
It has a circumferential length of 7 to about 27 mm. Filter media are prepared from fibrous materials such as cellulose acetate or polypropylene tow. The filter element can contain materials such as triacetin and/or polyethylene glycol. The plug wrap is typically a conventional paper plug wrapper and may be air permeable or substantially air impermeable. Also, to form various filter segments, if desired,
Cellulose acetate filter elements that are not wrapped in plastic wrap can also be used. Filter elements with a wide range of mainstream smoke removal efficiencies can be used. A variety of filter elements suitable for use in the present invention can be manufactured using well-known filter manufacturing methods and equipment.

[0042] Certain filter elements have very low mainstream smoke removal efficiency while still maintaining the desired draw characteristics of the cigarette. Those with low mainstream smoke removal efficiency are so-called “
This is called a "low efficiency" filter. Low efficiency filters have a low ability to remove particulate matter from mainstream smoke, typically having a particle removal efficiency in mainstream smoke of less than about 40% by weight. In the present invention, it is desirable to use a low efficiency filter in order to achieve a relatively low level of tar emissions as a result of the filter's relatively high air permeability or high air dilution effect. Cigarettes with low efficiency filter elements are
To provide a means for reducing gas components in mainstream smoke.

Certain filter elements contain acids, such as organic acids. Such an acid may be included in the filter material during its manufacture, or may be applied to the filter material after it is manufactured. The acid is
It is preferable to contain it uniformly within the filter material. Examples of suitable organic acids include malic acid, citric acid, levulinic acid, fumaric acid, oxalic acid, tartaric acid, and blends thereof. Typically, the filter element contains at least about 2.5%, preferably about 4.5%, based on the weight of the filter material.
A sufficient amount of acid is included to obtain a filter material having an acid content of at least %. Normally, the amount of acid contained in the filter element is approximately 20% of the weight of the filter material.
less than, in most cases less than about 10%, acid. Examples of filter materials include approx. Experimental Filter Tow F-577 and Experimental Filter Tow F-576 from Eastman Chemical Co. contain from 5 to about 5 weight percent citric acid. Two or more filter segments made of different types of filter media (e.g., tow) containing different types of organic acids and/or different proportions of organic acids are combined using, e.g., a plug-tube bonding method. A filter element can also be formed by this.

Typically, the tipping material surrounds the filter element and a portion of the tobacco rod adjacent thereto and extends about 3 to 6 mm along the length of the tobacco rod. The tipping material is typically a conventional paper tipping material and is affixed to the filter element and a portion of the tobacco rod adjacent thereto by an adhesive. As the chip material, materials having various porosity can be used. For example, the chipping material may be substantially air impermeable, or it may be air permeable, or the chipping material may have perforations, openings or air holes provided therein to provide air dilution means. The perforation process can also be carried out, for example using mechanical or laser techniques. The total area of the perforations and the placement of the perforations along the circumference of the cigarette can be varied to control the performance characteristics of the cigarettes of the present invention.

[0045] In the case of the cigarette with air diluting means (air diluting type or venting type) of the present invention, the amount of air dilution can be determined in various ways, but in most cases it is about 10% or more, and in most cases it is about 25% or more. shall be. The upper air dilution limit is usually
Less than about 75%, and often less than about 65%.

Cigarettes of the present invention exhibit desirable high draw resistance. For example, the cigarette of the present invention has a 17.5
cc/sec. about 50 to about 40 mm (
shows the pressure drop in the water column). Cigarette pressure drop values are typically measured using a Filtrona Filter Test Station (CTS Series) available from Filtrona Instruments and Automation. The cigarette of the present invention has a 17.5cc/
sec. It is preferred to have a pressure drop or suction resistance of from about 70 to about 180 mm (water column), more preferably from about 80 to about 150 mm (water column), in an air flow of .

[0047] The cigarette of the present invention usually has a
Less than about 20 mg of sidestream tar is delivered per bottle, preferably about 10 mg. The cigarettes of the present invention typically have more than about 6 puffs, and preferably more than 8 puffs per cigarette when smoked under FTC smoking conditions. Further, the number of puffs per cigarette of the present invention when smoked under FTC smoking conditions is usually less than about 15 puffs, and in many cases less than about 12 puffs. Additionally, the cigarette of the present invention typically has a puff cycle of about 2 m per minute of puff cycle.
less than 1 g, preferably about 1.5 mg, most preferably about 1
Deliver mg of sidestream tar.

Cigarettes of the present invention produce acceptable ash and cones when smoked under FTC smoking conditions. The ash is not too dark in color and does not flake off easily from the cigarette. The conical fire mass is of acceptable length, does not have excessive cohesiveness, and is not prone to collapse (has good integrity).

The cigarette of the present invention maintains smoldering under static combustion conditions (ie, without any inhalation after ignition). Preferred cigarettes will remain smoldering without self-extinguishing for at least about 3 minutes, preferably at least about 5 minutes, and often at least about 7 minutes. For preferred cigarettes, at least about one-third of the flammable length of the tobacco rod, often at least about one-half of the flammable length of the tobacco rod, and often a substantial portion of the flammable length of the tobacco rod. Generally, all of them burn without self-extinguishment under static combustion conditions.

The cigarettes of the present invention burn at an acceptable rate during smoking, particularly when smoldering under static combustion conditions. Representative cigarettes of the invention, particularly about 24
The linear burning rate under static combustion conditions for a tobacco rod of a cigarette having a circumferential length of ~25 mm is about 5 mm/min, and often about 1.5 mm/min to about 4 mm/min.

FTC per cigarette of the present invention
The amount of tar generated is usually about 2 to about 14 mg, and FT
The ratio of C tar to FTC carbon monoxide is less than about 1.8, and often less than about 1.6.

[0052] Actual examples embodying the present invention will be explained below, but these examples do not limit the scope of the present invention. All "%" are based on weight.

Example 1 A cigarette as shown in FIG. 1 was prepared as follows. A tobacco rod with a length of 57 mm and a length of 27 mm.
A cigarette with a total length of about 84 mm and a circumferential length of about 24.8 mm was manufactured, having a filter element of mm. The filter element was constructed from cellulose acetate tow (2.9 denier per filament, 41,000 denier total) wrapped with non-porous plug wrap. Cellulose acetate tow was plasticized using triacetin. The filter element was bonded to a tobacco rod using a non-porous chip material. That is, the filter element was bonded to the tobacco rod by wrapping the tip material over the entire length of the filter element and the adjacent tobacco rod for a length of approximately 4 mm. This filter element was not provided with ventilation holes.

Tobacco rods were prepared with a smokable material blend consisting of tobacco material that was cased with a casing agent. To be more specific, this tobacco material is so-called "
American Blend, which includes hot-air-cured Burley and Oriental tobaccos, as well as reconstituted tobacco obtained by papermaking and expanded, hot-air-dried Burley tobaccos. The tobacco blend was cased with a mixture of water, glycerin, and flavoring. This blend is 2.54mm (1i
n) in the form of a strand of tobacco material cut into approximately 32 cuts and equilibrated to a moisture level of approximately 12.5%. The weight of tobacco material contained in one tobacco rod is approximately 650 mg.

The second or outer wrap material is a flax fiber/calcium carbonate paper sold by Kimberly-Clark under the designation P-3122-4-1. The paper wrap contains about 1.1% sodium carboxymethylcellulose (SCMC), about 0.3% Harcon 70 from Hercules, Inc., and about 5.5% sodium carboxymethyl cellulose (SCMC).
Coated with 2% sodium citrate, its intrinsic permeability is less than 1 in Coresta units, and the basis weight is 32
g/m2. Perforations are perforated in this paper wrap using the electrostatic perforation method.
The wrap had a net transmittance of .

The first or inner wrap material is paper sold by Kimberly-Clark Company under the product number P-3122-4-4. This paper wrap contains approximately 60% tobacco wood chips, approximately 20% wood pulp, and approximately 20% calcium carbonate particles, with no added combustion modifiers in the form of water-soluble salts. This paper wrap is light brown in color, has a slightly washed surface, and has an inherent transmittance of about 125 Coresta units. Perforations are perforated in this paper wrap using the electrostatic perforation method.
The wrap had a net transmittance of .

The smokable material blend is wrapped with the inner wrap, and the inner wrap is wrapped with the outer wrap. The inner and outer wraps should be in direct contact with each other (
That is, the inner circumferential surface of the outer wrap is brought into contact with the outer circumferential surface of the inner wrap).

When the tobacco rod of this cigarette is lit, the smokable material blend inside the paper wrap burns and produces smoke. It produces less visible sidestream smoke during smoking, remains smoldering under static combustion conditions after the puff, and the entire length of the combustible tobacco rod is consumed (i.e., the cigarette does not self-extinguish).

For comparison purposes, the following cigarette having a total length of about 84 mm and a circumferential length of about 24.8 mm was produced, which had a tobacco rod with a length of 57 mm and a filter element with a length of 27 mm. In the case of this cigarette, perforations were formed in the filter element and tip material in an annular arrangement by laser processing at a distance of approximately 13 mm from the mouth end to provide air dilution of approximately 73%. The smokable material blend was identical to the cased tobacco material blend used in the above-described cigarette of this Example 1. The paper wrap surrounding the tobacco rod is a single layer, and the paper wrap is manufactured by Ecsta Corporation under Standard No. It is commercially available as 719 and has an intrinsic transmittance of 29 in Coresta units. The packing density of the tobacco material blend wrapped in this paper wrap is approximately 0.2 g/cm3. When this comparative cigarette was smoked, it produced more visible sidestream smoke than the above-mentioned cigarette of Example 1.

Example 2 The second or outer wrap material is commercially available from Ecsta Corporation under the product number TOD 05759 and the first or inner wrap material is available from Kimberly-Clark Company under the designation P-2831-189-AA4. Cigarettes were made substantially similar to those described in Example 1, except that cigarettes were sold under the product no. This inner wrap has no electrostatic perforations and no combustion modifiers in the form of aqueous salts are added.

The second or outer wrap material is a thick paper with low visible sidestream smoke emissions, the base sheet having a thickness of about 3
Contains 0% calcium carbonate, approximately 8% magnesium hydroxide, and approximately 62% flax fiber. Its specific transmittance is approximately 10 in Coresta units, and its basic weight is 48 g/
m2. Add 2% maleic acid to this paper wrap,
An aqueous solution containing 6% potassium malate, 6% potassium chloride, and a 2.5% additive package sold by Quest International under the product number DY 05012 was applied using a size press. This paper wrap is approximately 39m per 1g of dry weight of its base sheet.
g of potassium ions and about 3.8% malate ions (ie, added to the paper as potassium malate and malic acid). The paper was perforated by electrostatic perforation, resulting in a wrap having a net porosity of approximately 110 Coresta units.

Example 3 A cigarette was made substantially similar to that described in Example 1, except that the second or outer wrap material was commercially available from Ecsta Corporation under the designation TOD 05721. . The outer wrap material is a heavy paper with low visible sidestream smoke emissions, and its base sheet is comprised of approximately 30% calcium carbonate, approximately 10% magnesium hydroxide, and approximately 60% flax fibers. Contains. Its specific transmittance is approximately 2.5 Coresta units and its basis weight is 50 g/m2. 7.5% on this paper wrap
potassium citrate, 6% sucrose, 2% citric acid, and DY from Quest International.
An aqueous solution containing a 2.5% additive package sold under the product number 05012 was applied using a size press. This paper wrap was perforated by electrostatic perforation, resulting in a wrap having a net porosity of approximately 110 Coresta units.

Example 4 Example 4 except that the second or outer wrap material was commercially available from Ecsta Corporation under the product number TOD 05504 and the first or inner wrap material was that used in Example 2. Cigarettes substantially similar to those described in 1 were manufactured.

The second or outer wrap material is a thick paper with low visible sidestream smoke emissions, the base sheet having a thickness of about 1
Contains 5% calcium carbonate, approximately 25% magnesium hydroxide, and approximately 60% flax fiber. Its intrinsic transmittance is about 10 in Coresta units, and its basic weight is 48g.
/m2. Add 2% malic acid to this paper wrap,
An aqueous solution containing 12% potassium chloride was applied using a size press. The paper wrap contains about 45 mg of potassium ions and about 1.3% malate ions (ie, added to the paper as malic acid) per gram of dry weight of the base sheet. The content of potassium ions in this paper is considerably higher than the content of sodium ions. Perforations are made on this paper by electrostatic perforation,
The wrap had a net porosity of approximately 110 Coresta units.

Example 5 Cigarettes as shown in Figures 1 and 2 were prepared as follows. A tobacco rod with a length of 57 mm,
Approximately 84 mm total length with a 27 mm long filter element
A cigarette with a circumference of about 24.8 mm was manufactured. The filter element was constructed from cellulose acetate tow (3.3 denier per filament, 35,000 denier total) wrapped with non-porous paper plug wrap. This cellulose acetate tow was plasticized using triacetin. The filter element was bonded to a tobacco rod using a non-porous chip material. That is, the filter element was bonded to the tobacco rod by wrapping the tip material over the entire length of the filter element and the adjacent tobacco rod for a length of approximately 4 mm. The filter element had an annular array of perforations drilled through the filter element and tip material approximately 13 mm from the mouth end to provide approximately 20% air dilution.

Tobacco rods were prepared with a smokable material blend consisting of tobacco material that was cased with a casing agent. To be more specific, this tobacco material is so-called "
American Blend, which includes hot-air-cured Burley and Oriental tobaccos, as well as reconstituted tobacco obtained by papermaking and expanded, hot-air-dried Burley tobaccos. The tobacco blend was cased with a mixture of water, glycerin, and flavoring amounts. This blend is 2.54mm (1i
n) in the form of a strand of tobacco material cut into approximately 32 cuts and equilibrated to a moisture level of approximately 12.5%. The weight of tobacco material contained in one tobacco rod is approximately 700 mg.

The second or outer wrap material is a wood pulp/calcium carbonate paper sold by Kimberly-Clark under the product designation P-2831-102. This paper wrap is coated with approximately 1.1% sodium carboxymethyl cellulose (SCMC) and approximately 5.3% potassium citrate, and its air permeability is approximately 1 in Coresta units, and the basis weight is 30g/m2.

The first or inner wrap material was prepared as follows. Approximately 0.45 liters of tap water at ambient temperature and a blend of approximately 20 liters of Oriental tobacco in the form of chopped refill.
5g and about 1% soft wood pulp mixed in water
0ml was mixed. This soft wood pulp is commercially available as Hybrite pulp and exhibits a freeness of 85. The resulting mixture was stirred at high speed in a mixer for about 5 minutes, and the resulting slurry contained
Approximately 1.5% tobacco petiole pulp mixed in water
ml was added. This tobacco petiole pulp exhibits a freeness of 130. To this slurry was added about 1.5 g of magnesium hydroxide powder, sold as a 325 mesh (U.S.) powder by Alpha Products, and about 1.5 g of crystallized calcium carbonate particles, sold as Albuquer 5970 by Fighter Incorporated. 1.5g
was added. The resulting mixture was stirred at low speed in a mixer for about 1 minute, and the resulting slurry was mixed with 100 mesh (U
．． S) into the headbox of a paper machine equipped with a screen and paper sheets were produced in a conventional manner. This paper sheet was dried at a temperature of about 100° C. The resulting paper sheet had a thickness of about 0.31 mm and a dry basis weight of about 53 g/m 2 . This paper was coated with 4.7% potassium citrate.

The smokable material blend is wrapped with the inner wrap, and the inner wrap is wrapped with the outer wrap. The inner and outer wraps should be in direct contact with each other (
That is, the inner circumferential surface of the outer wrap is brought into contact with the outer circumferential surface of the inner wrap).

When the tobacco rod of this cigarette is lit, the smokable material blend inside the paper wrap burns and produces smoke. It produces less visible sidestream smoke during smoking, remains smoldering under static combustion conditions after the puff, and the entire length of the combustible tobacco rod is consumed (i.e., the cigarette does not self-extinguish).

Example 6: (i) vents were provided to provide approximately 60% air dilution and (ii) the inner wrap contained approximately 4.7% potassium citrate and approximately 16% Oriental seeds. Cigarettes were made substantially similar to those described in Example 5 except that they were coated with an aqueous extract of tobacco.

Example 7 The inner wrap material is about 10% magnesium hydroxide and about 7%
5% Oriental tobacco shredded supplement and approx. 15%
Cigarettes were made substantially similar to those described in Example 5, except that the cigarettes were made of wood pulp and coated with about 40% of an aqueous extract of Oriental tobacco.

Example 8 The inner wrap material is about 15% magnesium hydroxide and about 7% magnesium hydroxide.
0% Oriental tobacco shredded refill and approx. 15%
Cigarettes were made substantially similar to those described in Example 5, except that they were made of wood pulp of

Example 9 Cigarettes as shown in FIG. 1 were prepared as follows. A tobacco rod with a length of 57 mm and a length of 27 mm.
A cigarette with a total length of about 84 mm and a circumferential length of about 24.8 mm was manufactured, having a filter element of mm. The filter element was constructed from cellulose acetate tow surrounded by non-porous plug wrap. The filter element was bonded to a tobacco rod using a non-porous chip material. That is, the filter element was bonded to the tobacco rod by wrapping the tip material over the entire length of the filter element and the adjacent tobacco rod for a length of about 4 mm. This filter element was not provided with ventilation holes.

Tobacco rods were prepared with a smokable material blend consisting of tobacco material that was cased with a casing agent. To be more specific, this tobacco material is so-called "
American Blend, which includes hot-air-cured Burley and Oriental tobaccos, as well as reconstituted tobacco obtained by papermaking and expanded, hot-air-dried Burley tobaccos. The tobacco blend was cased with a mixture of water, glycerin, and flavoring amounts. This blend is 2.54mm (1i
n) in the form of a strand of tobacco material cut into approximately 32 cuts and equilibrated to a moisture level of approximately 12.5%. The weight of tobacco material contained in one tobacco rod is approximately 650 mg.

The second or outer wrap material is a flax fiber/calcium carbonate paper sold by Kimberly-Clark under the designation P-2540-84. The paper wrap contains approximately 1.1% sodium carboxymethylcellulose (SCMC), approximately 0.3% Hercules Inc. Harcon 70, and approximately 5.2% sodium carboxymethylcellulose (SCMC).
% of sodium citrate, its air permeability is approximately 5 in Coresta units, and the basis weight is 30 g/
m2.

The first or inner wrap material is paper sold by Kimberly-Clark Company under the product number P-2540-94-D. This paper wrap contains about 50% tobacco wood chips and about 50% activated carbon particles obtained from coconut shells. This paper wrap is black in color, has a slightly washed surface, and has an air permeability of about 380 Coresta units.

The smokable material blend is wrapped with the inner wrap, and the inner wrap is covered with the outer wrap. The inner and outer wraps should be in direct contact with each other (
That is, the inner circumferential surface of the outer wrap is brought into contact with the outer circumferential surface of the inner wrap).

When the tobacco rod of this cigarette is lit, the smokable material blend inside the paper wrap burns and produces smoke. It produces less visible sidestream smoke during smoking, remains smoldering under static combustion conditions after the puff, and the entire length of the combustible tobacco rod is consumed (i.e., the cigarette does not self-extinguish).

Example 10 Cigarettes as shown in FIG. 1 were prepared as follows. A tobacco rod with a length of 57 mm and a length of 27 mm.
A cigarette with a total length of about 84 mm and a circumferential length of about 24.8 mm was manufactured, having a filter element of mm. The filter element was constructed using medium efficiency (medium filter efficiency) cellulose acetate tow (3.3 g/filament) wrapped with non-porous (air impermeable) paper plug wrap using conventional filter manufacturing methods. denier, total denier 35,000 denier). The filter element was aligned in butt relation to a tobacco rod of the same diameter and bonded to the tobacco rod using a non-porous tipping material. That is, the filter element was bonded to the tobacco rod by wrapping the chip material over the entire length of the filter element and the adjacent tobacco rod for a length of about 4 mm, and fixing with adhesive. In this cigarette, perforations were laser-machined in the filter element and the tip material in an annular arrangement approximately 13 mm from the mouth end to provide air dilution of approximately 30 to approximately 60%.

Tobacco rods were prepared with a smokable material blend. Specifically, the tobacco material comprises about 29% hot air-cured tobacco material, about 14% a mixture of expanded, hot-air-cured tobacco material, Burley tobacco, and cutting supplements, and about 25%. It contains reconstituted tobacco, about 17% Oriental tobacco, and about 125% Burley tobacco. This blend is in the form of tobacco strands cut into approximately 25 cuts per inch.

The second or outer wrap material is available from Ecsta Corporation under the product designation TOD 05504.

The first or inner wrap material is paper sold by Kimberly-Clark Company under the product number P-2540-136E. This paper wrap consists of inert carbon particles (average particle size of about 8
microns). The color of this paper wrap is black, has a slightly washed surface, and has a basic weight of approximately 67g/m2.
The air permeability is approximately 28 in Coresta units.

The smokable material blend is wrapped with the inner wrap, and the inner wrap is wrapped with the outer wrap. The inner and outer wraps should be in direct contact with each other (
That is, the inner circumferential surface of the outer wrap is brought into contact with the outer circumferential surface of the inner wrap).

[0085] The weight of this cigarette is about 0.98 g, and the packing density of the tobacco rod refill is about 240 mg/
cm3.

When the tobacco rod of this cigarette is ignited, the shredded tobacco replenisher inside the paper wrap burns and produces smoke. This cigarette produces a rich tobacco taste when smoked and also exhibits good drag resistance. Mainstream smoke is not irritating to the throat and provides the desired smoking satisfaction. Also, the mainstream smoke of this cigarette is
Less dry aftertaste than cigarettes made with paper wraps that are not treated with malic acid. The cigarette also generates less visible sidestream smoke during smoking and produces ash with good integrity.

Example 11 The second or outer wrap material is commercially available from Ecsta Corporation under the product number TOD 05560 and the first or inner wrap material is available from Kimberly-Clark Company under the product number P-2540-136E. Cigarettes were made substantially similar to those described in Example 10, except that cigarettes were made as sold in Example 10.

Example 12 The first or inner wrap material was made from tobacco shred refill and wood pulp and treated with an aqueous solution of potassium citrate, P-1976-25- from Kimberly-Clark.
A cigarette was made substantially similar to that described in Example 10, except that it was sold under the product number 1.

Example 13 The second or outer wrap material is commercially available from Ecsta Corporation under the product number TOD 05551 and the first or inner wrap material is available from Kimberly-Clark Company under the product number P-2540-136E. Cigarettes were made substantially similar to those described in Example 10, except that cigarettes were made as sold in Example 10.

Example 14 The second or outer wrap material is commercially available from Ecsta Corporation under the product number TOD 05505 and the first or inner wrap material is available from Kimberly-Clark Company under the product number P-2540-136E. Cigarettes were made substantially similar to those described in Example 10, except that cigarettes were made as those sold by.

Example 15 The first or inner wrap material was manufactured by Kimberly-Clark from P-
Cigarettes were made substantially similar to those described in Example 12, except that they were sold under the product number 1976-25-2.

Example 16 The first or inner wrap material was manufactured by Kimberly-Clark from P-
Cigarettes were made substantially similar to those described in Example 12, except that the cigarettes were sold under the product number 1976-25-3.

Example 17 The second or outer wrap material is commercially available from Ecsta Corporation under the product number TOD 05551, and the first or inner wrap material is available from Kimberly-Clark Company under the product number P-2830-130. Cigarettes were made substantially similar to those described in Example 10, except that cigarettes were made as sold in Example 10.

Example 18 The first or inner wrap material was manufactured by Kimberly-Clark from P-
A cigarette was made substantially similar to that described in Example 17, except that it was sold under the product number 2674-157-A5116.

Example 19 The first or inner wrap material was manufactured by Kimberly-Clark from P-
Cigarettes were made substantially similar to those described in Example 1 except that they were sold under the product number 2831-189-AA4.

Example 20 The first or inner wrap material was manufactured by Kimberly-Clark from P-
Cigarettes were made substantially similar to those described in Example 3 except that they were sold under the product number 2831-189-AA4.

Example 21 The first or inner wrap material was made from Kimberly-Clark P-2540-94-C containing about 60% tobacco wood chips and about 40% activated carbon particles obtained from coconut shells.
Cigarettes were manufactured having substantially the same configuration, construction, and components as described in Example 9, except that they were sold under the product number .

Example 22 The second or outer wrap material was manufactured by Kimberly-Clark from P-
2831-102, except that the first or inner wrap material was sold by Kimberly-Clark Company under the product number P-1976-25-3. Cigarettes substantially similar to those described above were manufactured. The inner wrap material is made from a mixture of wood pulp, "American Blend" chop filler, and Turkish tobacco;
It contains potassium citrate as an additive, has a basis weight of 63 g/m2, and has an inherent porosity of about 74 in Coresta units.

Example 23 The first or inner wrap material was manufactured by Kimberly-Clark from P-
A cigarette was made substantially similar to that described in Example 22, except that it was sold under the product number 2831-189-AA4.

Example 24 The first or inner wrap material was manufactured by Kimberly-Clark from P-
A cigarette was made substantially similar to that described in Example 22, except that it was sold under the product number 2831-189-AAG212. The inner wrap material is manufactured from a mixture of wood pulp, "American Blend" chopped filler and Turkish tobacco, has a basis weight of 60 g/m2, and has an inherent porosity of Coresta units. It is about 64.

Example 25 The second or outer wrap material was manufactured by Kimberly-Clark from P-
Cigarettes were made substantially similar to those described in Example 22, except that the cigarettes were sold under the product number 2831-149. The outer wrap is a paper made of calcium carbonate and flax coated with potassium citrate and low viscosity ammonium alginate.
The basis weight is 30 g/m2 and the intrinsic porosity is approximately 1 in Coresta units.

Example 26 The second or outer wrap material was manufactured by Kimberly-Clark from P-
A cigarette was made substantially similar to that described in Example 23, except that it was sold under the product number 2831-149.

Example 27 The second or outer wrap material was manufactured by Kimberly-Clark from P-
A cigarette was made substantially similar to that described in Example 24, except that it was sold under the product number 2831-149.

Example 28 The second or outer wrap material is commercially available from Ecsta Corporation under the product number TOD 05504 and the first or inner wrap material is available from Kimberly-Clark Company under the designation P-2674-157-A5116. Cigarettes were made substantially similar to those described in Example 5, except that they were sold under the product no.

Example 29 The second or outer wrap material was manufactured by Kimberly-Clark from P-
Example 5, except that the first or inner wrap material was sold by Kimberly-Clark Company under the product number P-2674-157-6215. Cigarettes substantially similar to those described above were manufactured.

Example 30 The first or inner wrap material was manufactured by Kimberly-Clark from P-
A cigarette was made substantially similar to that described in Example 28, except that it was sold under the product number 2674-157-6215.

Example 31 The first or inner wrap material was manufactured by Kimberly-Clark from P-
A cigarette was made substantially similar to that described in Example 29, except that it was sold under the product number 2674-157-A5116.

Example 32 The second or outer wrap material was manufactured by Kimberly-Clark from P-
Cigarettes were made substantially similar to those described in Example 10, except that the cigarettes were commercially available under the product number 2540-84.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a cigarette according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the cigarette taken along line 2-2 of FIG. 1;

FIG. 3 is a cross-sectional view of an alternative embodiment cigarette taken along line 3--3 of FIG. 1;

FIG. 4 is a schematic diagram of one type of wrap material that can be used to form the tobacco rod of the cigarette of the present invention.

[Explanation of symbols]

10: Cigarette 15: Tobacco rod (smokable material rod) 20: Smokable material (refill) 25: First (inner) wrap material 27: Second (outer) wrap material 30: Filter element 35: Filter material 40: Plug wrap 45: Chipping material 50: Air diluting means (perforations formed in the tipping material and plug wrap) 60: Perforations formed in the tobacco rod wrap material

Claims (16)

[Claims] 1. A smokable material rod formed by covering the outer peripheral surface of a smokable replenishment material with a first wrapping material, and covering the outer peripheral surface of the first wrapping material with a second wrapping material. The first wrap material contains tobacco material, and the second wrap material includes (i) a cellulosic base web and an inorganic filler, and (ii) a cigarette.
A cigarette having an inherent air permeability of about 15 Coresta units or less. 2. The second wrap material has about 40 Coresta units.
The cigarette according to claim 1, characterized in that the cigarette has a net air permeability of at least 10%. 3. The cigarette according to claim 1, wherein the first wrap material contains a salt additive. 4. The cigarette according to claim 1, wherein the first wrap material contains a carbonaceous material. 5. The second wrap material has an inherent air permeability of about 8 Coresta units or less.
Cigarettes listed in. 6. The cigarette according to claim 2, wherein the inorganic filler of the second wrap material contains magnesium hydroxide. 7. The second wrap material has about 50 Coresta units.
7. A cigarette according to claim 2 or 6, having a net air permeability of ~225. 8. The cigarette according to claim 3, wherein the salt additive of the first wrap material includes calcium carbonate. 9. The cigarette according to claim 3, wherein the salt additive of the first wrap material includes a water-soluble salt. 10. The first wrap material has about 5 Coresta units.
The cigarette according to claim 1, having an inherent air permeability of 0 or more. 11. A smokable material rod formed by covering the outer peripheral surface of a smokable replenishment material with a first wrapping material, and covering the outer peripheral surface of the first wrapping material with a second wrapping material. A cigarette, wherein the first wrap material is (i
) contains tobacco material, (ii) has an inherent air permeability of about 50 Coresta units or more, and the second wrap material (i) contains a cellulosic base web and an inorganic filler; ii) A cigarette having an inherent air permeability of about 15 Coresta units or less. 12. The second wrap material has about 8 Coresta units.
A cigarette according to claim 11, characterized in that it has an inherent air permeability of: 13. The second wrap material has about 4 Coresta units.
A cigarette according to claim 11, characterized in that it has a net air permeability of 0 or more. 14. The cigarette according to claim 11 or 13, wherein the first wrap material contains a carbonaceous material. 15. The cigarette according to claim 11 or 13, wherein the first wrap material contains a salt additive. 16. The cigarette according to claim 11, wherein the first wrap material contains a water-soluble salt additive.