Method for preparing low-harm cigarette by high-quality utilization of tobacco waste

Abstract

The application discloses a method for preparing low-harm cigarettes by high-quality utilization of tobacco waste. The method comprises the following steps: (1) tobacco stems are subjected to enzymolysis by using a composite enzyme solution, then the enzymolyzed tobacco stems are high-concentration beaten to a certain beating degree, and then beaten with wood pulp to prepare tobacco fiber-containing cigarette paper; (2) after being heated and humidified, tobacco shreds are subjected to microwave treatment, and then are subjected to air cooling and shaping to obtain expanded tobacco shreds; (3) after being mixed with conventional tobacco shreds, the expanded tobacco shreds are uniformly filled into the tobacco fiber-containing cigarette paper, and then are rolled and shaped to be connected with filters; and the low-harm cigarettes are obtained. The method is combined with "reducing tar and harm" and "high-quality utilization of waste" in a skillful manner, and is helpful to solve the contradiction between resource scarcity and environmental pressure while meeting the health demands of consumers.

Description

Technical Field

[0001] This invention belongs to the field of tobacco processing technology, specifically relating to a tobacco cigarette made by preparing tobacco fiber paper using enzymatic hydrolysis of tobacco stems and processing it using microwave segmented puffing technology, and the processing method thereof. Background Technology

[0002] Currently, traditional cigarettes mostly use cigarette paper made from hemp pulp or wood pulp. For products that pursue the ultimate natural tobacco flavor, non-tobacco fibers are still introduced. To reduce the use of non-tobacco fibers, some technologies have attempted to process tobacco stems for use in cigarette paper manufacturing to increase the proportion of tobacco in cigarettes. Patent CN2007100537914 discloses a method for preparing tobacco sheets by treating tobacco stems with a compound enzyme. This method separates the solid and liquid components after enzymatic hydrolysis of the tobacco stems. The solid portion is used for papermaking to produce sheets, and the liquid portion is concentrated and coated for reuse. Although this technology achieves the resource utilization of tobacco stems, its product is tobacco sheets (i.e., used as tobacco filler), rather than cigarette paper used for rolling wrappers. Patent CN2011102010589 discloses a method for preparing cigarette paper by extracting tobacco stems with hot water or steam explosion and then combining them with added fibers. However, the proportion of tobacco stem fibers added in these methods is limited, and the air permeability, basis weight and other parameters of the obtained cigarette paper lack synergistic design with the combustion performance of tobacco shreds. The smoldering performance of cigarettes still needs to be improved.

[0003] On the other hand, to improve the filling and combustion performance of tobacco shreds, various tobacco shred puffing treatment methods have been developed in the prior art. Patent CN2014104943743 discloses a method for improving tobacco stem quality by combining bio-enzyme treatment and microwave expansion technology. This method uses a compound enzyme to treat the tobacco stems before microwave expansion treatment; however, the treatment object is tobacco stems rather than tobacco leaves (shredded tobacco), and its microwave treatment is a single-stage atmospheric pressure treatment, without a specialized puffing process design tailored to the characteristics of tobacco shreds. Patent CN2011102203721 discloses a vacuum microwave tobacco shred expansion method; this method uses single-stage microwave treatment, and the tobacco shreds are prone to localized overheating in the microwave field, leading to the generation of burnt gas and loss of aroma components. Studies have shown that tobacco stems and shredded tobacco differ fundamentally in chemical composition and physical structure: tobacco stems are rich in cellulose and lignin, and have a dense and rigid structure; while shredded tobacco has a high content of sugars, pectin, and other easily charred substances, and its thin-walled cell tissue is soft, resulting in faster heating and more intense vaporization in a microwave field. It is also more sensitive to microwave power and temperature, and more prone to scorching. Therefore, directly applying the microwave processing technology of tobacco stems to shredded tobacco requires overcoming unique technical challenges such as the susceptibility to scorching, poor uniformity of expansion, and easy loss of heat-sensitive aroma components.

[0004] Furthermore, cigarette manufacturing is a systematic project, and the combustion performance of a cigarette is jointly determined by the cigarette paper and the tobacco. Factors such as the air permeability, basis weight, and combustion aid content of the cigarette paper significantly affect its smoldering rate, while the degree of expansion and filling density of the tobacco determine the internal pore structure and oxygen supply channels of the cigarette. Ideal combustion results can only be achieved when the smoldering rate of the cigarette paper and the burning rate of the tobacco are essentially the same; otherwise, problems such as excessively rapid burning, uneven smoldering lines, or even flameout can easily occur. In existing technologies, the preparation of cigarette paper and the processing of tobacco are usually optimized as independent processes, and a comprehensive technical solution that integrates the design of cigarette paper and tobacco in a coordinated manner to achieve the technical effect of "smooth smoldering lines and resistance to flameout" has not yet been seen.

[0005] This invention is proposed for this purpose. Summary of the Invention

[0006] This invention aims to overcome the shortcomings of existing technologies and provide a method for processing tobacco cigarettes: on the one hand, it realizes the high-value utilization of tobacco stems to prepare cigarette paper with a high proportion of tobacco fiber; on the other hand, it designs a special microwave puffing process for the characteristics of tobacco shreds to avoid the generation of burnt gas; at the same time, it makes the parameters of cigarette paper and tobacco shreds synergistically matched to achieve excellent combustion performance and sensory quality.

[0007] The tobacco cigarette method of the present invention produces tobacco fiber paper by enzymatically hydrolyzing tobacco stems into pulp and then combining it with microwave segmented expansion and conventional tobacco shreds. This method not only preserves the natural characteristics of tobacco fiber but also optimizes combustion performance and sensory quality.

[0008] The tobacco cigarette method of the present invention prepares tobacco fiber cigarette paper with specific quantitative and air permeability parameters by enzymatically hydrolyzing tobacco stems, and then performs synergistic matching design with tobacco shreds blended with a specific ratio of expanded / conventional tobacco shreds, thereby achieving the overall technical solution of "smooth smoldering line and not easy to extinguish".

[0009] The technical solution of the present invention is as follows:

[0010] The first aspect of this invention discloses a method for processing tobacco cigarettes, comprising the following steps:

[0011] (1) The tobacco stems are enzymatically hydrolyzed using a compound enzyme solution, and then the hydrolyzed tobacco stems are pulped to a certain degree of thaw, and then mixed with wood pulp to form cigarette paper containing tobacco fiber.

[0012] (2) After heating and humidifying the tobacco, microwave treatment is performed, followed by air cooling and shaping to obtain puffed tobacco;

[0013] (3) After mixing the expanded tobacco with regular tobacco, it is evenly filled into the tobacco fiber cigarette paper, rolled into shape and then attached with a filter tip; thus, the tobacco cigarette is obtained; it does not have a shell-core layered structure and a wet tobacco powder extrusion shell layer.

[0014] Preferably, in step (1), the compound enzyme solution is a compound enzyme solution of hemicellulase, laccase, and pectinase with an enzyme activity ratio of (2-5):(1-2):1; the enzymatic hydrolysis temperature is 45-55 ℃, the pH value is 4.5-5.5, and the time is 40-80 min; the high-consistency pulping concentration is 3.5-5.5 wt%, and the beating degree is 28-38 °SR; the wood pulp used is softwood pulp.

[0015] Preferably, the tobacco fiber-containing cigarette paper contains tobacco fiber accounting for 60-85 wt% of the oven-dry pulp mass, and includes 0.5-2 wt% tobacco extract, 8-15 wt% calcium carbonate, and 0.2-1 wt% potassium citrate; the basis weight of the tobacco fiber-containing cigarette paper is 18-26 g / m³. 2 Breathability 3000-6000 CU.

[0016] Preferably, in step (2), the moisture content of the tobacco shreds after heating and humidification is 20-24 wt%, and the temperature is 65-75 ℃; the microwave treatment is carried out in two stages: first, it is treated at 12-20 kW for 2-3 s, and then at 35-55 kW for 4-8 s; the negative pressure is maintained at -0.01 to -0.03 MPa during the microwave treatment; the microwave frequency is 915 MHz or 2450 MHz.

[0017] Preferably, in step (3), the blended tobacco is obtained by blending expanded tobacco and conventional tobacco at a mass ratio of (15-30):(70-85).

[0018] Preferably, after the cigarette is rolled in step (3), a drying and humidification process is also included, which is to dry it for 2-10 hours at a temperature of 15-25℃ and a relative humidity of 50-65%, and adjust the cigarette to make the final moisture content 11-13wt%.

[0019] The second aspect of this invention discloses a tobacco cigarette obtained by the aforementioned processing method, comprising a rolling wrapping layer and tobacco shreds filled therein; the rolling wrapping layer is tobacco fiber cigarette paper, wherein the tobacco fiber accounts for 60-85 wt% of the oven-dry pulp mass, and the paper basis weight is 18-26 g / m³. 2 The air permeability is 3000-6000 CU; the filling tobacco is obtained by blending expanded tobacco and regular tobacco in a ratio of (15-30):(70-85).

[0020] The processing method of this invention optimizes paper performance by adding specific additives to tobacco fiber pulp. Tobacco extract is added to improve the sensory harmony of the paper during combustion and avoid woody odors; calcium carbonate is added as a filler to adjust the paper's air permeability, opacity, and smoldering ash morphology; potassium citrate is added as a combustion regulator, utilizing its potassium ion catalytic effect to promote the smoldering stability of tobacco fiber-containing paper and prevent slow combustion or self-extinguishing due to high tobacco fiber content.

[0021] The puffed tobacco processed by the present invention adopts a two-stage microwave treatment, combined with maintaining a micro-negative pressure environment. The three are not simply superimposed, but form a complete closed loop of low-power preheating / high-power flash evaporation / micro-negative pressure environment. (1) Low-power preheating makes the internal moisture of the tobacco uniformly heated under mild conditions, realizing the slow migration and uniform distribution of moisture from the inside of the cells to the surface, avoiding the temperature gradient problem of "overheating of the outer layer and insufficient inner layer" caused by high-power direct irradiation; under the micro-negative pressure environment, the boiling point of water is reduced, and low-power heating can make the moisture reach the vaporization critical state, creating conditions for subsequent high-power flash evaporation. (2) In the high-power flash evaporation stage, on the basis that the internal moisture of the tobacco is uniformly distributed, the volume heating characteristics of high-power microwaves are used to make the moisture vaporize simultaneously inside the tobacco, realizing the volume expansion from the inside to the outside; high-power short-time treatment avoids the thermal decomposition of aroma components caused by long-term heating; the steam pressure formed during the flash evaporation process causes the tobacco cell walls to rupture rapidly and expand in volume, forming a loose porous structure. (3) Synergistic effect of micro-negative pressure environment. Maintaining a slightly negative pressure environment during microwave processing, in conjunction with the two microwave power levels, creates a triple synergy. The lower boiling point of water under this environment allows the moisture inside the tobacco to vaporize and expand at a lower temperature, preventing burnt aroma and aroma loss caused by high temperatures. The slightly negative pressure environment also promptly extracts the water vapor generated during vaporization from the cavity, preventing excessive humidity that could lead to the tobacco re-moistening or secondary moisture absorption. Furthermore, the reduced oxygen partial pressure within the cavity decreases the oxidative degradation of heat-sensitive aroma components. Low-power preheating creates uniform moisture distribution conditions for high-power flash evaporation, while the slightly negative pressure environment simultaneously serves the low-temperature vaporization during preheating and the rapid dehumidification during flash evaporation. The combined effect of these three factors is far superior to any single combination or simple superposition of measures, collectively achieving the goal of avoiding the adverse effect of localized overheating leading to burnt aroma. Optimal expansion uniformity requires a specific range of slightly negative pressure; excessively high or low pressure can negatively impact expansion uniformity.

[0022] The beneficial effects of this invention are:

[0023] The tobacco cigarettes obtained by the tobacco cigarette processing method of this invention have the following effects: 1. Excellent combustion performance: There is a synergistic matching relationship between the specific parameters of tobacco fiber cigarette paper (basis weight 18-26 g / m², air permeability 3000-6000 CU) and expanded tobacco. Factors such as the air permeability, basis weight, and combustion aid content of cigarette paper have a significant impact on the smoldering rate of cigarette paper; the smoldering state after the cigarette is lit is jointly determined by the smoldering performance of tobacco and cigarette paper. The smoldering rate of cigarette paper is the key to controlling the combustion rate of cigarette. Only when the smoldering rate of cigarette paper is basically consistent with the smoldering rate of tobacco can an ideal combustion effect be obtained. When the air permeability of cigarette paper is lower than 3000 CU, even if the potassium citrate content is at the upper limit, the cigarette is still prone to self-extinguishing due to insufficient oxygen supply during the smoldering process; when the air permeability is higher than 6000 CU, the cigarette burns too fast, the smoldering line is uneven, and the integrity of the ash column is poor. Similarly, when the proportion of expanded tobacco is less than 15%, the cigarette is too densely packed, resulting in slow smoldering or even flameout; when the proportion of expanded tobacco is greater than 30%, the cigarette is too loose, burning too quickly, and the satisfaction of the smoke decreases. Only when the parameters of the cigarette paper and the tobacco are both within the range defined by this invention can the comprehensive effect of "smooth smoldering line and difficulty in flameout" be achieved. 2. Reduction of harmful components: Segmented microwave expansion avoids the burnt smell caused by local overheating. Combined with the adsorption effect of tobacco paper, the release of tar and CO in the mainstream smoke is significantly reduced, improving the woody and impure smell. Microwave vacuum drying of tobacco can be carried out at a lower temperature, avoiding the decomposition and loss of heat-sensitive aroma components and preserving the aroma of the tobacco. 3. Environmentally friendly and simple process: It abandons the high-pressure equipment and chemical cross-linking agents required by traditional steam expansion, and adopts physical microwave expansion, which has low energy consumption, high safety, and a simple and efficient process. 4. Quality Improvement: Compared to single-layer expanded tobacco, the filling value of the blended tobacco is increased by more than 10%, the breakage rate is reduced, and the density of some unexpanded tobacco is retained, ensuring a satisfying smoke experience. 5. The tobacco cigarette of this invention can be considered a full-tobacco cigarette, with tobacco material accounting for 95.0-99.5 wt% of the total mass. 6. This invention utilizes tobacco waste stems in a high-quality manner to produce low-harm cigarettes. This invention, through the ingenious combination of "tar reduction and harm reduction" and "high-quality waste utilization," not only meets consumers' health demands but also helps to resolve the contradiction between resource scarcity and environmental pressure. Attached Figure Description

[0024] Figure 1 This is a process flow diagram of the tobacco cigarette processing method of the present invention.

[0025] Figure 2 It is the tobacco fiber-containing cigarette paper obtained in Example 1. Figure 3 It is the tobacco obtained after microwave puffing in Example 1.

[0026] Figure 4It is the cigarette obtained in Example 1.

[0027] Figure 5 These are the expanded tobacco shreds obtained in Comparative Examples A, B, and C, and Example 2.

[0028] Figure 6 This is the combustion effect of the cigarette in Example 4. Detailed Implementation

[0029] The present invention will be further described in detail below through specific embodiments, but it should not be construed as limiting the scope of the invention to the following examples. Various substitutions and modifications made based on ordinary technical knowledge and conventional methods in the art without departing from the above-described methodological spirit of the invention should be included within the scope of the invention.

[0030] Example 1:

[0031] (1) Preparation of tobacco fiber cigarette paper: Take flue-cured tobacco stems, sieve, wash, and cut into segments. Enzymatic hydrolysis is performed using a compound enzyme solution (hemicellulase:laccase:pectinase = 3:1:1) at 48 ℃, pH 5.0, and time 60 min; high-concentration pulping (concentration 4.5wt%) is carried out to a freeness of 32°SR; tobacco fiber accounts for 72wt% of the pulp, and tobacco extract 1.2wt%, calcium carbonate 12wt%, and potassium citrate 0.6wt% are added; the papermaking yield is 22 g / m³. 2 Cigarette paper containing tobacco fibers with a breathability of 4500 CU, such as... Figure 2 As shown;

[0032] (2) Preparation of blended tobacco shreds: The tobacco shreds were moistened to a water content of 22wt% and a temperature of 70℃; they were then placed in a 915 MHz microwave cavity, preheated at 15 kW for 2.5 s, flash-evaporated at 45 kW for 6 s, under a slight negative pressure of -0.02 MPa, and air-cooled to obtain expanded tobacco shreds as shown in the figure. Figure 3 As shown;

[0033] (3) Rolling: The blended tobacco is prepared by mixing expanded tobacco and regular tobacco at a ratio of 20:80. The blended tobacco is rolled with tobacco fiber cigarette paper and fitted with an acetate fiber filter. The mixture is then humidified at 22°C and 60% humidity for 6 hours until the moisture content reaches 12%, resulting in cigarettes as shown in the figure. Figure 4 As shown.

[0034] Test results: Tobacco material accounted for 98.5%; the filling value was 15.2% higher than the traditional control; the tar content of the mainstream smoke was reduced by 9.8%, and the CO content was reduced by 12.3%. Sensory evaluation showed a significant reduction in woody off-flavors and no flameout phenomenon.

[0035] Furthermore, when the ratio of compound enzyme activity was adjusted to hemicellulase:laccase:pectinase = 5:1:1, the physical strength of the paper was further improved; when the amount of potassium citrate added was reduced to 0.2 wt% and the amount of calcium carbonate was reduced to 8 wt%, the burning rate of the cigarette decreased slightly but no flameout occurred, indicating that the parameter range of the present invention has a wide applicability.

[0036] Example 2: Comparative experiment of two-stage and single-stage microwave processing.

[0037] Four groups of microwave-expanded tobacco shreds were evenly divided from the same batch and compared under the same total microwave energy input conditions, as shown in Table 1 below. Four groups of microwave-expanded tobacco shreds were obtained. Figure 5 As shown.

[0038] Table 1

[0039]

[0040] [Note]: The aroma component retention rate is based on 100% of the total amount of major aroma components (neoptiadiene, megastigmatrienone, etc.) in untreated tobacco. The number of charred spots is determined by image analysis to count the number of areas per unit mass of tobacco with a color L* value below a specific threshold.

[0041] The results showed that single-stage microwave treatment (Comparative Example A) resulted in a large number of scorched spots and severe loss of aroma components. Although introducing micro-negative pressure alone (Comparative Example B) or equal power two-stage treatment (Comparative Example C) provided some improvement, there were still many scorched spots and the aroma component retention rate was still not ideal. Only the solution of this application (Example 2), which uses two-stage power / micro-negative pressure at the same time, reduced the number of scorched spots to 3 per 100 g and the aroma component retention rate was as high as 89.2%. This indicates that the three methods produced a significant synergistic effect.

[0042] Example 3: Comparative experiments under different micro-negative pressure conditions are shown in Table 2.

[0043] Table 2

[0044]

[0045] [Note]: The uniformity of puffing is expressed by the coefficient of variation (CV%) of the volume of the puffed tobacco. The smaller the value, the more uniform the puffing. The intensity of the burnt smell is the average score given by a 10-person evaluation group on a scale of 1-9. The lower the score, the weaker the burnt smell.

[0046] The results show that when the micro-negative pressure is within the range of -0.01 to -0.03 MPa (Example 3), the puffing uniformity is optimal (CV=6.8%), the surface scorch area is minimal (0.5%), and the sensory evaluation shows the weakest absorption of burnt gas (2.1 points). When the micro-negative pressure is too low (e.g., -0.05 MPa), the puffing uniformity decreases, and the scorch area increases. This indicates that the micro-negative pressure range of -0.01 to -0.03 MPa is the key process window for the technical solution of this application and has criticality.

[0047] Example 4: Experiment on the synergistic effect of cigarette paper parameters and tobacco parameters on combustion performance.

[0048] Cigarette samples were prepared according to the cigarette paper-tobacco combination designed in Table 3, and their smoldering rate, combustion cone temperature and mainstream smoke composition were measured.

[0049] Table 3

[0050]

[0051] The results showed that: (1) When the permeability of the cigarette paper was below 3000 CU (Comparative Example G), even if the potassium citrate content was within the preferred range, the cigarette extinguishing rate was still as high as 15%, and the smoldering line velocity was low; (2) When the proportion of expanded tobacco was below 15% (Comparative Example H), the cigarette was too densely packed, and the extinguishing rate was as high as 20%; (3) When the proportion of expanded tobacco was above 30% (Comparative Example I), the cigarette burning speed was too fast (5.8 mm / min), and the smoke satisfaction decreased; (4) When the permeability of the cigarette paper was above 6000 CU (Comparative Example J), ​​the cigarette burning speed was too fast (6.5 mm / min), and the smoldering line was uneven; (5) Only when the permeability of the cigarette paper, the potassium citrate content, and the proportion of expanded tobacco were all within the limits of this invention (Example 4) did the smoldering line velocity of the cigarette (4.2 mm / min) be moderate, the extinguishing rate be 0%, and the tar release (9.8 mm / min) be low. The mg / vial level is relatively low, achieving a smooth smoldering line and reducing the likelihood of flameout. Figure 6 As shown.

[0052] Further analysis reveals an interactive effect between cigarette paper permeability and the proportion of expanded tobacco: when the permeability is 3000-6000 CU and the expanded tobacco proportion is 15-30%, the oxygen supply inside the cigarette and the combustion requirements of the tobacco are optimally matched. The smoldering rate of the cigarette paper is crucial for controlling the combustion rate of the cigarette; ideal combustion results can only be achieved when the smoldering rates of the cigarette paper and the tobacco are essentially the same. This invention achieves synergistic optimization of combustion performance by simultaneously adjusting cigarette paper parameters (permeability, potassium citrate content) and tobacco parameters (expansion ratio) to match their smoldering rates.

[0053] Comparative example: Refer to the prior art (the core-shell structure whole tobacco cigarette in CN2025117188406).

[0054] A core-shell structured whole tobacco cigarette (using steam-expanded tobacco as the core layer and wet tobacco powder as the shell layer) was prepared according to the method of Example 1 in CN2025117188406 previously disclosed by the applicant as a comparison.

[0055] Comparative results: Compared with Example 1, the comparative example's process energy consumption is about 40% higher, the cigarette filling value is 8.7% lower, and the tar release is 11.5% higher. Due to the dense outer shell and loose core of the wet tobacco powder, smoldering mismatch easily occurs during combustion, leading to flameout, and there is a noticeable residual chemical additive odor. This invention represents a significant improvement over the prior art of the comparative example.

[0056] The above description is only used to detail the specific embodiments of the present invention, but the technical solutions proposed by the present invention are not limited to the above methods. All equivalent modifications and variations made by those skilled in the art to the technology proposed by the present invention without departing from the basic principles of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A method for processing tobacco cigarettes, characterized in that, Includes the following steps: (1) The tobacco stems are enzymatically hydrolyzed using a compound enzyme solution, and then the hydrolyzed tobacco stems are pulped to a certain degree of thaw, and then mixed with wood pulp to form cigarette paper containing tobacco fiber. (2) After heating and humidifying the tobacco, microwave treatment is performed, followed by air cooling and shaping to obtain puffed tobacco; (3) After mixing the expanded tobacco with regular tobacco, the mixture is evenly filled into cigarette paper containing tobacco fiber, rolled into shape, and then fitted with a filter tip; thus, the tobacco cigarette is obtained.

2. The processing method according to claim 1, characterized in that, In step (1), the compound enzyme solution is a compound enzyme solution of hemicellulase, laccase and pectinase with an enzyme activity ratio of (2-5):(1-2):1; the enzymatic hydrolysis temperature is 45-55 ℃, the pH value is 4.5-5.5, and the time is 40-80 min; the high-consistency pulping concentration is 3.5-5.5wt%, and the knockout degree is 28-38 °SR; softwood pulp is used.

3. The processing method according to claim 1, characterized in that, The tobacco fiber-containing cigarette paper contains tobacco fiber accounting for 60-85 wt% of the oven-dry pulp mass; it also contains 0.5-2 wt% tobacco extract, 8-15 wt% calcium carbonate, and 0.2-1 wt% potassium citrate; the basis weight of the tobacco fiber-containing cigarette paper is 18-26 g / m³. 2 Breathability 3000-6000 CU.

4. The processing method according to claim 1, characterized in that, In step (2), the moisture content of the tobacco after heating and humidification is 20-24wt%, and the temperature is 65-75℃. The microwave treatment is carried out in two stages: first, it is treated at 12-20 kW for 2-3 s, and then at 35-55 kW for 4-8 s. During the microwave treatment, a negative pressure of -0.01 to -0.03 MPa is maintained.

5. The processing method according to claim 1, characterized in that, In step (3), the blended tobacco shreds are obtained by blending puffed tobacco shreds and conventional tobacco shreds at a mass ratio of (15-30): (70-85).

6. The processing method according to claim 1, characterized in that, Step (3) After the cigarette is rolled, it also includes a drying and humidification process. The steps are: dry for 2-10 hours at a temperature of 15-25 ℃ and a relative humidity of 50-65%, and adjust the cigarette to make the final moisture content 11-13wt.

7. The tobacco cigarette obtained by the processing method according to any one of claims 1-6, characterized in that, It includes a rolling wrapping layer and tobacco filling therein; the rolling wrapping layer is tobacco fiber cigarette paper, in which tobacco fiber accounts for 60-85 wt% of the oven-dry pulp mass, and the paper basis weight is 18-26 g / m³. 2 The air permeability is 3000-6000 CU; the filling tobacco is obtained by blending expanded tobacco and regular tobacco in a ratio of (15-30):(70-85).

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