JP3957398B2 - Low tar content cigarettes with tobacco flavor comparable to conventional cigarette flavors with high tar content - Google Patents

Abstract

The cigarette, which has less than (1) mg of tar, includes a filter which comprises, on the tobacco side, a paper filter (T1) with a very high resistance to drawing and a very high filtration coefficient. On the mouth side is a cellulose acetate filter (T3) with a very low resistance to drawing and a very low filtration coefficient. Aromatisation means able to recreate the tobacco taste are distributed along the filter section (3) in an aromatised zone (T2) located upstream of the acetate filter. A ventilation means (P) is arranged such that the ventilation air path inside the aromatic zone is shorter than the path of the smoke flow coming from the tobacco section (1).

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cigarette with a tobacco flavor equivalent to a conventional cigarette with a higher tar yield but with an acceptable inhalation resistance and a very low tar content.
[0002]
[Prior art]
In general, it is known to use more or less complex filters in one or more regions in order to reduce the proportion of unwanted substances (especially tar content). As the area filtering rate increases, so does the suction resistance, making it less acceptable to smokers.
[0003]
In order to solve this problem, a plurality of regions having a region with a high filtering rate on the tobacco side, a region with a low suction resistance on the mouth side, and a vent provided at the level of the joint of the two filters The creation of a filter was proposed.
With these arrangements, smoke passing through the mouth area is diluted with the aeration flow, thus creating an acceptable suction resistance.
[0004]
The disadvantage of this proposal is the fact that smoke that is considerably filtered in the first zone and diluted by the surrounding atmosphere in the second zone no longer has the properties that stimulate the necessary sensation.
Furthermore, the use of a paper filter with a high filtering rate (within the required filtering rate), as evidenced by the comments disclosed in EP 0,608,047 Changing the flavor and adding an unpleasant scent to the flavor are further disadvantages.
[0005]
Efforts to mask this bad taste have been made by incorporating flavors that taste very different from the taste of tobacco (menthol, anethole).
However, as pointed out in French patent FR 2.459,011, the ideal measure is to flavor the smoke with tobacco extract or synthetic tobacco flavor. However, in order to obtain a sufficient flavor, a relatively large amount of expensive flavoring agent is required. In addition, these flavors volatilize rapidly, making them useless and hindering prolonged cigarette storage. Therefore, the present invention aims to place a fine grain of magnesium silicate hydrate with added flavor in a non-breathable filter and place it in a hot and humid smoke stream from a cigarette. To do. This scheme appears to be unsuitable (ie incompatible) for the production of very low tar content cigarettes that require the use of vent filters of the type previously described.
[0006]
In addition, the use of flavored porous wrapping allows for the flavouring of the air flow before mixing with the flow of smoke passing through the filter section with high filtration capacity, increasing the complexity of the filter. Making the filter more expensive. This measure has the further disadvantage of producing a heterogeneous mixture in terms of the taste of the gas flow inhaled by the smoker. That is, only the aeration (periphery) flow has a flavor.
[0007]
The object of the present invention is therefore in particular to remedy the above drawbacks.
[0008]
[Means for Solving the Problems]
For this reason, the present invention proposes a cigarette having a filter and a very low tar content (1 mg or less). The filter is located on the tobacco side, has a very high suction resistance and a very high filtration coefficient, and a filter region in the wrapping paper, and is located on the mouth side, has a very low suction resistance and a filtration coefficient. A flavoring means capable of modifying the taste of tobacco, which is distributed over the entire cross-section of the filter in a filter area in cellulose acetate, and a flavoring area located upstream of the filter area of acetate ester, and a flavoring area. Ventilation means arranged so that the average path of the air flow inside is shorter than the average path of the smoke flow coming from the tobacco area.
[0009]
With such a construction, flavors flow of smoke coming from the tobacco region transferred to the center region of the filter area of the acetic ester is high flow velocity, the path with flavor is short, which initially pressed against the unpalatable no vent stream taste It is first exposed to a more intense flavoring (flow heat and humidity + path length) than simmering (ie, during the period when the paper area changes the taste the most).
[0010]
Conversely, if the cigarette is consumed significantly, the flavoring of the smoke stream (less affected by bad taste) is less essential (loss of flavor capacity in the flavor portion). However, the flavor of the aeration air flow increases with the high temperature and moisture content of the filter, compensating for the reduced smoke flavor.
The two treatments result in a gas mixture that is more homogeneous in taste from the cigarette at the spout and requires a small amount of flavoring to flavor.
[0011]
Conveniently, the flavoring agent is included between a filter area with a high filtration coefficient and a filter area with a low filtration coefficient. In this case, the vent is preferably provided in the central region of the flavored filter region.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Examples of cigarettes according to the invention will be described on the basis of non-limiting examples with reference to the accompanying drawings.
In this embodiment, the cigarette is composed of a tobacco area 1 having a normal size and no flavor, wrapped in cigarette wrapping paper 2 and extended by a ventilation filter 3. The ventilation filter 3 has three regions T _{1 to} T ₃ accommodated in the tubular over sleeve 4. The oversleeve 4 overlaps the tobacco area 1 to form a mechanical link between the filter 3 and the tobacco area 1.
[0013]
Tobacco region 1 has a low tar yield (high percentage of expanded tobacco) and in this example contains 1.5-3% sodium citrate and 29-35% calcium carbonate C0 ₃ Ca 40 ˜80 pers porous wrapping 2 is included.
The tobacco-side filter region T ₁ has a length in the range of 10 mm, and is a paper region having a very high suction resistance and filtering action (suction resistance is about 150, filtering action> 80%).
[0014]
The filter region T ₃ located on the mouth side is a region of cellulose acetate having a length of the order of 10 mm, and the suction resistance RT and the filtering action are very small.
A region T ₂ having a length of 5 mm is provided between the region T ₁ and the region T ₃ . Region T ₂ constitutes a chamber containing an adsorbent material, such as a foam stone, flavored with a flavoring agent that smells of tobacco.
[0015]
The filter 3 is vented by the hole P of the oversleeve 4 at approximately 13 mm from the orifice of the filter T ₃ located on the mouth side, ie at the level of the central region of the region T ₂ .
With such a construction, the smoke produced by the combustion of tobacco region 1, its flow is indicated by the shaded area between the solid lines V1, V2, mainly through the center region of the region T _2, T _3. On the other hand, the ventilation air flow (solid lines V3, V4) passes through the hole P and circulates in an annular region surrounding the smoke flow.
[0016]
Thus, obviously, the average path of the ventilation air flow in region T ₂ is shorter than the average path of smoke flow coming from tobacco region 1.
In this way, two flavoring processes leading to the production of a mixture of gases having the properties of stimulating a satisfactory sensation with a minimal amount of flavor (despite the bad taste produced by the filter area) can get.
[Brief description of the drawings]
FIG. 1 is a partial sectional view of a cigarette provided with a filter according to the present invention.
[Explanation of symbols]
1 Tobacco area 2 Wrapping paper 3 Filter T ₁ Filter area T ₂ Filter area T ₃ Filter area P Vent

Claims (8)

A cigarette having a tobacco area (1) containing a high proportion of tobacco expanded with a very low tar content of 1 mg or less and provided with a filter,
A filter region (T ₁ ) located on the tobacco side and located inside the paper with a very high suction resistance and a very high filtering coefficient;
A filter region (T ₃ ) located inside the cellulose acetate located on the mouth side, with very low suction resistance and very low filtering coefficient;
Flavoring means that can modify the taste of tobacco and distribute it throughout the cross-section of the filter (3) in the flavored region (T ₂ ) located upstream of the filter region (T ₃ ) in the acetate ester;
Aeration means (P) configured such that the average path of the aeration air flow inside the flavored area (T ₂ ) is shorter than the average path of the smoke flow coming from the tobacco area (1) ;
Cigarette characterized by consisting of. The flavoring agent is contained in a filter region (T ₂ ) included between a filter region (T ₁ ) having a high filtering coefficient and a filter region (T ₃ ) having a low filtering coefficient. The cigarette described.   3. The cigarette according to claim 2, wherein the vent hole (P) is provided in a central area of the filter area to which flavor has been added. Tobacco regions of low tar yield (1) has a 40-80 Perth porous wrapping paper containing a 1.5 to 3% sodium citrate and 29 to 35% of calcium carbonate C0 ₃ Ca (2) cigarette 請 Motomeko 1 wherein you characterized in that. The tobacco-side filter area (T ₁ ) is a paper area having a length in the range of 10 mm, a very high suction resistance and a high filtering action, ie a suction resistance of approximately 150 and a filtering action> 80%. cigarette 請 Motomeko 1 wherein you characterized in that. Filter area located in the mouth side, of the order is 10mm in length, you wherein a and filtering action very low suction resistance is a region in the very low cellulose acetate 請 Motomeko 1 according cigarette. Region (T _2), the cigarettes 請 Motomeko 1 wherein you comprising a sepiolite in which flavor attached in flavor smell of tobacco is. The vent cigarette 請 Motomeko 3 wherein you and being located at approximately 13mm from the filter orifice situated at the mouth side.

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