WO2011127676A1

WO2011127676A1 - Thin slice material for cigarette and cigarette

Info

Publication number: WO2011127676A1
Application number: PCT/CN2010/073547
Authority: WO
Inventors: 李森盛; 赵保军; 谢旭东; 方维远; 陈臣; 高占甫; 吴莹莹
Original assignee: 厦门中海钓台生物工程有限公司
Priority date: 2010-04-15
Filing date: 2010-06-04
Publication date: 2011-10-20
Also published as: CN102217791A

Abstract

A thin-slice material for cigarettes and a cigarette using same are provided. The thin-slice material for cigarettes comprises a thin-slice base which contains 0.01 to 40 percent by mass of zeolite. The combustible part of the cigarette comprises at least 3 percent by mass of shreds of said thin-slice material, which are produced by slicing said thin-slice material. Harm-reducing zeolite is added to the cigarette by means of said thin-slice material as a carrier, solving the problem in mainstream cigarette smoke of tar-clogged filters reducing the activity of the zeolite, and solving also the problem of dosage limitations upon zeolite when same is added to shredded tobaccos. At the same time, the amount of harmful ingredients in sidestream smoke are decreased, and full use is made of the harm-reducing effect of zeolite.

Description

Tobacco sheets and cigarettes

Technical field

The invention relates to the technical field of cigarette processing, in particular to a sheet for cigarettes and a cigarette. Background technique

In recent years, with the continuous improvement of people's living standards and quality of life, consumers are increasingly demanding the safety of smoking. Therefore, how to reduce the content of various harmful substances such as nitrosamines, condensed aromatic hydrocarbons, carbon monoxide (CO) and the like in cigarette smoke to reduce the harmful components in the mainstream smoke generated when the cigarette is burned is healthy for smokers. Hazards, as well as sidestream smoke scattered into the crowd, are harmful to the health of passive smokers and environmental pollution, and have become an important issue facing the cigarette industry. The development of additives with harm reduction effects and their application to filters and cigarette cut tobacco has become the most widely used method of harm reduction and defocusing.

Among the many harm reduction additives, zeolite has selective adsorption-catalytic properties, and has strong adsorption effect on harmful substances such as nitrosamines and polycyclic aromatic hydrocarbons in cigarette smoke. Therefore, it is widely used in cigarettes. Reduce damage and reduce focus. At present, there are two main ways in which zeolite is used as a harm reduction additive in cigarettes: one is to add the zeolite directly to the tobacco; the other is to add the zeolite to the nozzle of the cigarette filter.

However, both of the above methods are insufficient. In the first method, the zeolite must first be bonded to a crosslinking agent (for example, silica gel) and then mixed with the gum solution to be added as an additive to the tobacco. During the bonding of the zeolite to the crosslinking agent, the pores and pores on the surface of the zeolite are blocked, greatly reducing the selective adsorption-catalysis. In addition, when the zeolite is directly added to the tobacco, the amount of the zeolite is limited, the amount of the zeolite added is small, and the harm reduction effect is not obvious; in the second mode, the zeolite can be used for the nitrosamines in the mainstream smoke in the early stage of the combustion of the cigarette. Harmful substances such as aromatic hydrocarbons play an adsorption role, but as the cigarettes burn, more and more smoke tar covers the nozzle bars, causing the pore size and pores of the zeolite in the filter to be blocked, and the active center activity is reduced, selective adsorption. - The effect of catalysis is greatly diminished, resulting in a decrease or even inactivation of its mitigating effect. Moreover, the addition of zeolite to the nozzle of the filter can only adsorb harmful substances such as nitrosamines and polycyclic aromatic hydrocarbons in the mainstream smoke, and does not contribute to the sidestream smoke, and the nitrosamines and polycyclics in the sidestream smoke. The content of harmful substances such as aromatic hydrocarbons is much higher than that in mainstream smoke. Therefore, in the above manner zeolite The harm reduction effect cannot be fully exerted. Summary of the invention

In view of the defects in the prior art, the present invention provides a sheet for tobacco, which is added with an appropriate amount of zeolite, which can be directly added to the shredded tobacco, or even directly used for cigarettes, and fully exerts the reduction of the zeolite. Harmful effect, reduce the content of harmful substances in cigarette smoke.

The present invention still further provides a cigarette to which the above-mentioned tobacco sheet is added, which is advantageous for reducing the injury to a smoker.

The present invention provides a sheet for tobacco, comprising: a sheet base, the sheet base containing

0.01-40% by mass of zeolite.

In the above-mentioned tobacco sheet, the sheet base contains 0.1 to 10% by mass of zeolite.

In the above-mentioned tobacco sheet, the sheet base contains 5% by mass of zeolite. The present invention also provides a cigarette comprising a flammable portion of the cigarette comprising a tobacco sheet processed using the tobacco sheet provided above.

In the above cigarette, the tobacco flakes have a content of at least 3% by mass of the flammable portion of the cigarette, and the balance is cut tobacco.

In the cigarette provided above, the tobacco flakes have a silk content of at least 25% of the mass of the flammable portion of the cigarette, and the balance is cut tobacco.

In the cigarette provided above, the tobacco flakes have a silk content of 25-60% of the mass of the flammable portion of the cigarette.

The tobacco sheet and the cigarette provided by the invention, the tobacco sheet is used as a carrier, the zeolite having the harm reduction effect is added to the tobacco sheet, and the flake and the flake sheet are respectively shredded, and then mixed in a certain ratio, or The flakes and the flakes are mixed in a certain ratio and then shredded together, and then the mixed silk is rolled into a cigarette. On the one hand, it overcomes the shortcomings of the existing zeolite as a harm reduction additive for cigarettes: it not only solves the problem that the tar-covering filter in the mainstream flue gas reduces the activity of the zeolite, but also solves the limitation of the dose when the zeolite is directly added to the tobacco. The problem is that it can also reduce the harmful components in the sidestream smoke and fully exert the harm reduction effect of the zeolite. On the other hand, the use of flake flakes improves the flammability of cigarettes, and can reduce the release of harmful substances such as CO generated during the combustion of cigarettes, thereby reducing harm. use. DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings to be used in the embodiments or the description of the prior art will be briefly described below, and obviously, the attached in the following description The drawings are some specific embodiments of the present invention, and those skilled in the art can also propose different modifications to them without any creative work.

1 is a flow chart of a method for preparing a sheet for tobacco according to a second embodiment of the present invention;

Figure is a flow chart of a method for preparing a cigarette according to a third embodiment of the present invention. detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in conjunction with the specific embodiments of the present invention and the accompanying drawings, but the following embodiments cannot be used to describe the embodiments of the present invention. It is to be understood that the scope of the present invention is defined by the scope of the present invention, and all other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Zeolite is a kind of inorganic aluminosilicate crystal with uniform pores and regular pore structure. Its pore size is equivalent to the general molecular size, and it has a large specific surface area and adsorption capacity. It is a kind of molecular sieve. Most types of zeolite molecular sieves have strong acid centers on the surface, while the crystal has a strong Coulomb field and polarity. It has a unique "selective catalysis" function and strong adsorption separation performance, and it can be replaced by isomorphism. Such physical and chemical methods as well as loading other active components to modify their physicochemical properties. The zeolite is added to the cigarette. In the high temperature region where the cigarette is burned (the temperature can be as high as 800 ° C), the catalytic activity of the zeolite will be excited. At this time, the zeolite can adsorb nitrosamines and polycyclic aromatic hydrocarbons in the cigarette smoke. Harmful Substance. For example, when a Y-type zeolite is used, it is also possible to selectively adsorb polycyclic aromatic hydrocarbons in the flue gas. However, in the prior art, the use of zeolite as a harm reduction additive to adsorb harmful substances in cigarette smoke does not fully exert the adsorption of zeolite, and affects the effect of zeolite on the reduction of cigarettes. Based on this, each embodiment of the present invention provides a technical solution capable of giving full play to the adsorption of zeolite.

Embodiment 1 The present embodiment provides a sheet for tobacco comprising a sheet base on which a zeolite having a detrimental effect is adsorbed. Among them, zeolites such as NaY, NaZSM, NaZSM-5, and NaA can be used. In this embodiment, a flake flake is used as a carrier of zeolite, and a zeolite having a detrimental action is added to the cigarette. When the cigarette is burned, the zeolite adsorbed in the flake filament will exert its selective adsorption-catalysis effect, reducing the content of harmful components in the cigarette smoke, especially reducing the content of nitrosamines and polycyclic aromatic hydrocarbons. The purpose of harm. At the same time, the zeolite does not affect the original flavor style of the cigarette when it is burned.

The flue-cured flakes provided in this embodiment can effectively reduce the content of harmful components in the cigarette smoke by adsorbing zeolite, and reduce the harm caused by the cigarette smoke to the human body. However, due to the process of preparing the flake sheet and the limitation of the characteristics of the flake sheet itself, the content of the zeolite added to the flake sheet is limited. In the present embodiment, the sheet of the flake sheet contains 0.01 to 40%. The (mass) zeolite preferably contains 0.1 to 10% by mass of zeolite. The zeolite in the technical solution of the present invention may be unmodified or modified, and the present invention does not limit the type of zeolite. However, it is possible to select zeolite types having different pore structures and properties depending on the harm reduction requirements of the cigarette, and to select zeolites having a suitable particle size according to the zeolite addition position requirements determined in the sheet processing.

Among them, the tobacco sheet in the embodiment may be a tobacco sheet or a non-tobacco sheet. If tobacco flakes are used, tobacco flakes can be prepared by using a tobacco or tobacco by-product as a raw material, using an existing process (also called a papermaking process), and a pulping and papermaking process, which is discarded in the production of cigarettes. Or rejected tobacco residues, such as straw, tobacco leaf fragments, stems, etc., and may be added to the process for preparing the tobacco sheet (for example, a pulping section, a coating section of the paper product) to prepare a tobacco sheet containing zeolite .

If a non-tobacco sheet is used, the non-tobacco sheet may be made from agricultural by-products other than tobacco, including crop straw, roots, stems, tea leaves, tea stems, and herbs, which provide fibrous tissue, and Non-tobacco flakes can be prepared by a process similar to the preparation of tobacco flakes, and zeolites can also be added during the preparation of non-tobacco flakes to prepare flake flakes comprising zeolite.

[Embodiment 2] This embodiment exemplifies a process for preparing a flake sheet containing zeolite according to the present invention by taking a flake sheet containing 5% by mass of zeolite. Specifically, in this embodiment, a tobacco flake comprising zeolite is prepared by using agricultural by-products as raw materials, as shown in FIG. 1, comprising the following steps:

Step 11: immersing agricultural by-products to obtain a swelling; Specifically, the agricultural by-product can be placed in hot water of 60-80 ° C for immersion treatment for 20-30 minutes to obtain agricultural by-product swell, or the agricultural by-product is placed at room temperature water (this invention In the room temperature water), the immersion treatment is carried out for 0.5 to 6 hours to obtain the swelling. Of course, the solution of the present invention can also select a water soaking material higher than room temperature, but not higher than 80 ° C, and determine an appropriate soaking time according to the water temperature condition.

Step 12, the above-mentioned agricultural by-product swelling is subjected to twisting to obtain crude agricultural by-product fibers; specifically, the swollen agricultural by-products can be sent to a spinning machine through a conveying device for silk processing, so as to facilitate Follow-up actions.

Step 13: Washing the crude by-product of the agricultural by-product to obtain the agricultural by-product fiber; specifically, the crude agricultural by-product fiber may be placed in hot water of 60-80 ° C for 20-30 minutes of washing treatment; Obtaining agricultural by-product fibers, or placing the crude agricultural by-product fibers in normal temperature water for 30 to 60 minutes to obtain agricultural by-product fibers; by the above washing treatment, impurities in the crude by-products of agricultural by-products can be removed. Cells and partially water-soluble substances, such as nitrogen-containing compounds, are used for the purpose of purifying agricultural by-product fibers. Of course, the solution of the present invention can also select water above room temperature, but not higher than 80 ° C as a washing solvent, and determine the appropriate washing time according to the water temperature.

Step 14: refining the agricultural by-product fiber to prepare an agricultural by-product slurry, and simultaneously preparing a reinforcing fiber slurry, and mixing the prepared reinforcing fiber slurry with the agricultural by-product slurry to obtain a mixed pulp. Material

In this step, the process of preparing the reinforced fiber slurry can be carried out by using a process of preparing a reinforced fiber slurry in a papermaking process, which will not be discussed in detail in this embodiment. The addition of the reinforcing fibers is selective, depending on the strength requirements of the finished sheet. Since the agricultural by-products used have short fibers and a large amount of miscellaneous cells, the strength of the finished product is poor during the papermaking process. Therefore, depending on the type of agricultural by-product selected, it is necessary to add an appropriate amount of reinforcing fibers to most agricultural by-product slurries to increase the strength of the flakes. In the present embodiment, by adding a reinforcing fiber slurry, reinforcing fibers are used to prepare a sheet for tobacco having a strength in accordance with the requirements of the cigarette processing technology. The addition amount of the reinforcing fiber slurry is generally controlled to 0 to 40% by weight of the total amount of the slurry, and the addition amount is preferably 20 to 40% by weight.

Step 15, the mixed slurry is sent to the flushing tank, the filler is added and diluted, and the zeolite may be added while adding the filler as needed; In this process, by adding a filler (for example, light calcium carbonate) to the slurry tank, and adding water to dilute the mixed slurry to a desired concentration, an appropriate amount of zeolite suspension (for example, water may be added in this step). Dispersion) to prepare a flake flake containing 5% by mass of zeolite. This step is the first addition site in which zeolite can be added in this example.

Step 16, the diluted mixed slurry is sent to the high-position box, and the retention aid is added to prepare a slurry, and the zeolite may be added while adding the retention aid as needed;

In this process, the retention of the mixed slurry on the net is increased by adding a retention aid (e.g., guar gum) to the elevated tank, and the slurry pressure of the mixed slurry is stabilized for subsequent papermaking operations. The retention aid should be a retention aid in accordance with the tobacco industry standard known in the art, and the present invention is not limited to its specific selection, and the addition amount is a conventional addition amount of the retention aid. In the process, zeolite may also be added, for example, the zeolite suspension is mixed with a retention aid and added to the mixed slurry, and by controlling the addition amount of the zeolite suspension, a zeolite containing 5% by mass is prepared. The flakes are used. This process is the second addition site in which zeolite can be added in this example.

Step 17, feeding the slurry into a forming wire for papermaking to obtain a sheet base;

Step 18: performing a first drying process on the sheet base to remove most of the moisture in the sheet base; and step 19, feeding the sheet base into the coating tank for coating treatment, and coating the coating liquid as needed Simultaneously adding zeolite;

Specifically, the dried sheet substrate is fed into a coating tank, and the prepared coating liquid is coated on the sheet base in a coating tank, wherein the coating liquid serves to increase the aroma The amount, the removal of the gas, the increase in the concentration of the smoke, the reduction of the irritation, the improvement of the aftertaste, the improvement of the mouthfeel comfort, and the like, therefore, an aqueous solution made of the substance having the above-described effects can be used as the coating liquid in the present embodiment. At the same time, a zeolite suspension can also be prepared in the process, and the zeolite suspension is mixed with the coating liquid and applied together to the sheet base (the sheet base may already contain zeolite), and the zeolite is controlled. The suspension was added in an amount to prepare a flake sheet containing 5% by mass of zeolite. This coating process is the third addition site in which the zeolite can be added in this example.

In step 20, the sheet base is subjected to a second drying treatment to obtain a sheet for tobacco that satisfies the needs. For example, a flake sheet having a zeolite content of 5% and a water content of 10 to 13% and a thickness of 0.3 0.4 mm is prepared.

It should be noted that the smoke containing zeolite can be prepared through the above three added positions. In the present invention, depending on the requirements for preparing the cigarette, the zeolite may be added at any of the above-mentioned addition positions, or a combination of the above-mentioned plurality of addition positions may be employed. When the zeolite is added at a plurality of positions, the content of the zeolite in the flake sheet is the total content.

The tobacco flake prepared in this embodiment contains 5% (mass) of zeolite, which is applied to cigarettes, which solves the problem that the tar-covering filter in the mainstream flue gas reduces the activity of the zeolite, and also solves the direct addition of the zeolite on the shredded tobacco. The time-dose is limited, the cross-linking agent blocks the micropores and channels on the surface of the zeolite, and at the same time, the harmful components in the side-flow flue gas are reduced, and the harm reduction effect of the zeolite is fully exerted.

Embodiment 3

A third embodiment of the present invention provides a cigarette, i.e., a flammable portion of the cigarette (in the case of a cigarette with a filter, a portion other than the filter) comprising at least a portion of the tobacco sheet prepared by the method of the second embodiment. For common cigarettes, including cigarette paper, cut tobacco and filters. The tobacco shredded tobacco of the present invention is uniformly mixed with the tobacco flakes cut by the tobacco flakes, specifically, the flakes and the flake flakes are respectively shredded, and then mixed in a certain ratio, or the flakes are smoked. After being mixed with a sheet of tobacco in a certain ratio, the yarn is shredded, and then the mixed yarn is rolled into a cigarette. The tobacco sheet of this embodiment can be the sheet for tobacco provided in the first embodiment. Among them, the flake sheet comprises a flake base, and the flake base contains 0.01 to 40% by mass of zeolite, preferably 0.1 to 10% by mass of zeolite. The tobacco sheet may be a tobacco sheet or a non-tobacco sheet, which adsorbs zeolite to utilize the adsorption and catalysis of the zeolite to reduce the content of harmful components in the cigarette smoke.

In the cigarette of the present embodiment, the zeolite adsorbed by the flake filaments can effectively reduce the content of harmful components in the cigarette smoke and reduce the harm caused by the cigarette smoke to the human body. According to the different needs of cigarettes, the content of the flakes in the cigarette can be at least 3% (mass) of the flammable portion of the cigarette, preferably 25-60% (mass), to achieve the purpose of harm reduction, and Affect the smoking style of cigarettes. When the flammable portion of the cigarette is entirely processed from a tobacco sheet which is made of a non-tobacco sheet (the tobacco sheet has a silk content of 100%), the obtained cigarette is a safe cigarette which is completely free of cut tobacco.

In this embodiment, the process of preparing the cigarette of the embodiment is described by using the agricultural by-product as an example. As shown in FIG. 2, the method specifically includes:

Step 21, preparing a flake sheet containing zeolite by using agricultural by-products as raw materials;

In this step, the tobacco sheet of the present embodiment can be prepared by using the method for preparing the tobacco sheet provided in the second embodiment of the present invention. For the detailed process, refer to the description of the second embodiment, wherein the content of the zeolite can be In step 22, the flakes and the obtained flake flakes are respectively shredded, and then mixed in a certain ratio, or the flakes and the obtained flake flakes are mixed in a certain ratio and then shred together, and then the mixed silk rolls are rolled. Made into cigarettes.

Wherein, the process of shredding the tobacco sheet can be carried out by using a shredding process and equipment in the cigarette processing process, and the cut tobacco shred yarn is preferably substantially the same length and width as the shredded tobacco to be mixed with the ordinary shredded tobacco. Similarly, the process of shredding the flakes and the flakes in a certain ratio and then cutting them together can also be carried out by the shredding process and equipment in the cigarette processing process. The mixing ratio of the tobacco sheet and the tobacco can be 3 to 100%, and the mixing ratio can be determined according to different cigarette requirements, preferably 25 to 60% (mass).

The cigarette prepared in the present embodiment is fed with a flake sheet as a carrier, and a zeolite having a detrimental action is added to the flake sheet, and the flake sheet is applied to a cigarette. On the one hand, it overcomes the shortcomings of the existing zeolite as a harm reduction additive for cigarettes: it not only solves the problem that the tar-covering filter in the mainstream flue gas reduces the activity of the zeolite, but also solves the limitation of the dose when the zeolite is directly added to the tobacco. The cross-linking agent blocks the micropores and channels on the surface of the zeolite, and at the same time reduces the harmful components in the sidestream flue gas, and fully exerts the harm reduction effect of the zeolite. On the other hand, the use of the flake sheet improves the combustibility of the cigarette, and can reduce the release amount of harmful substances such as CO generated during the combustion of the cigarette, thereby reducing the harm.

Further, the sensory evaluation test of the cigarette prepared in the present embodiment shows that the cigarette prepared in the embodiment basically maintains the original flavor-absorbing style, and the cigarette in the smoke is added by adding different proportions of the tobacco sheet. Hazardous substances such as nitramine, 3, 4-benzopyrene, phenol, crotonaldehyde, CO, hydrocyanic acid and ammonia were all significantly reduced.

The action and effect of the tobacco sheet provided by the embodiment of the present invention in cigarettes will be described below by specific experimental data.

The NaY zeolite is selected, and the agricultural by-product is used as the sheet base material. According to the method provided in the second embodiment of the present invention, the zeolite suspension is coated on the sheet base together with the coating liquid in the papermaking section. A sheet of tobacco containing 5% by mass of zeolite was prepared.

The NaZSM-5 zeolite is selected, and the agricultural by-product is used as the raw material of the flakes. According to the method provided in the second embodiment of the present invention, the suspension of the zeolite is added to the mixed slurry together with the retention aid in the pulping section. To produce a sheet of tobacco containing 5% by mass of zeolite. Experiment 1

The flake flakes containing 5% NaY zeolite were shredded, put into the cut tobacco at a 25% addition amount, and rolled into a cigarette. After the sensory evaluation, the original smoking style of the cigarette was basically unchanged, and the smoke test results showed that the amount of nitrosamine decreased by 25.7%, the amount of benzopyrene decreased by 34.8%, and other harmful components were also significantly reduced, while lateral flow The harmful components in the flue gas are also reduced, and the harm reduction effect is remarkable.

Experiment 2

A sheet of tobacco containing 5% NaY zeolite was shredded, put into the cut tobacco at a 50% addition amount, and rolled into a cigarette. After the sensory evaluation, the original smoking style of the cigarette was basically unchanged, and the smoke test results showed that the amount of nitrosamine decreased by 31.7%, the benzopyrene decreased by 41.6%, and other harmful components were also significantly reduced, while the sidestream smoke was also reduced. The harmful components in the group have also been reduced, and the harm reduction effect is remarkable.

Experiment 3

The flake flakes containing 5% NaZSM-5 zeolite were shredded, put into the cut tobacco at a 25% addition amount, and rolled into a cigarette. After the sensory evaluation, the original smoking style of the cigarette was basically unchanged, and the smoke test results showed that the amount of nitrosamine decreased by 27.7%, the benzopyrene decreased by 36.6%, and other harmful components were also significantly reduced, while the sidestream smoke was also reduced. The harmful components in the group have also been reduced, and the harm reduction effect is remarkable.

Experiment 4

The flakes containing 5% NaZSM-5 zeolite were shredded, put into the cut tobacco at 50% addition, and rolled into a cigarette. After the sensory evaluation, the original smoking style of the cigarette was basically unchanged, and the smoke test results showed that the amount of nitrosamine decreased by 36.4%, the amount of polycyclic aromatic hydrocarbons decreased by 43.8%, and other harmful components were also significantly reduced, while lateral flow The harmful components in the flue gas are also reduced, and the harm reduction effect is remarkable.

Further, it can be seen from the above experimental data that the tobacco sheet and cigarette provided by the invention can effectively reduce the release of harmful substances in the mainstream smoke and sidestream smoke of the cigarette not only under the premise that the cigarette smoking style is basically unchanged. At the same time, it can alleviate the tight supply of tobacco raw materials in the tobacco industry and reduce the use of tobacco in cigarettes, which has great social and economic benefits.

It should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: The technical solutions described in the foregoing embodiments are modified, or some of the technical features are equivalently replaced. The modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

Rights request

A sheet for cigarettes, comprising a sheet base, characterized in that the sheet base contains 0.01 to 40% by mass of zeolite.

The sheet for tobacco according to claim 1, wherein the sheet base contains 0.1 to 10% by mass of zeolite.

The sheet for tobacco according to claim 1, wherein the sheet base contains 5% by mass of zeolite.

A cigarette characterized in that the flammable portion of the cigarette comprises a shredded tobacco sheet processed by the tobacco sheet according to any one of claims 1 to 3.

The cigarette according to claim 4, wherein the tobacco flakes have a content of at least 3% by mass of the flammable portion of the cigarette, and the balance is cut tobacco.

The cigarette according to claim 4, wherein the tobacco flakes have a content of at least 25% by mass of the flammable portion of the cigarette, and the balance is cut tobacco.

The cigarette according to claim 6, wherein the tobacco flakes have a silk content of from 25 to 60% by mass of the flammable portion of the cigarette.