A method for improving the sensory quality of reconstituted tobacco leaf

Abstract

The application provides a method for improving the sensory quality of reconstituted tobacco, which comprises the following steps: (1) crushing a tobacco sheet raw material to obtain tobacco powder; (2) mixing fibers with water to defibrate, and then grinding to obtain a fiber slurry; (3) mixing glycerol with an adhesive, and then mixing with water to obtain a glycerol-adhesive mixture; (4) mixing the fiber slurry, the glycerol-adhesive mixture, the tobacco powder and a biological enzyme to ferment, to obtain a slurry; and (5) drying the slurry to obtain finished reconstituted tobacco. Compared with the prior art, the reconstituted tobacco prepared by the method has significantly reduced woody smell, green smell, dry smell, bitterness and irritation, and has significantly improved aroma quality, comfort and aftertaste. The aroma of the heated cigarette prepared by the method is more transparent, the smoke yield is larger, and the taste is better.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of reconstituted tobacco production, and particularly relates to a method for improving the sensory quality of reconstituted tobacco. BACKGROUND

[0002] The slurry method is a process used to make tobacco sheet, which involves the steps of pulverizing tobacco raw materials and uniformly dispersing them in water. In this process, adhesives and other additives are added to form a uniform slurry. After that, the slurry is laid on a rotating metal belt for drying. The dried sheet can be peeled off and possibly wound or cut, and then further packaged. The slurry method process for producing reconstituted tobacco has been widely used in heat-not-burn cigarettes. The international tobacco giant Philip Morris USA produces heat-not-burn cigarettes that widely use this process. The heat-not-burn cigarettes produced by this process have more transparent aroma, larger smoke volume, and better taste. However, there are still some problems with the slurry method reconstituted tobacco: the woodiness, burnt taste, and bitterness are too prominent, the tobacco aroma is not rich enough, and the aroma coordination is poor.

[0003] CN116807046A discloses a bubble elimination system and method for slurry method reconstituted tobacco for heat-not-burn cigarettes. The system includes an adhesive adding device, a pulverizer, a powder homogenizing bin, a homogenizing mixer, a slurry preparation tank, a defoaming buffer integrated tank, a first three-way valve, a second three-way valve, a first vacuum pumping device, and a second vacuum pumping device. The invention uses a three-stage bubble control and elimination method to reduce the generation of bubbles in the slurry and gradually eliminate the bubbles that have already been generated in the slurry, ensuring the quality of the slurry and the reconstituted tobacco after drying and molding, and improving the strength, processing resistance, and quality stability of the heat-not-burn cigarette product. The system is simple in structure, high in reliability, easy to operate, can quickly eliminate bubbles in the slurry, and has good process adaptability and promotional significance. However, the technical effect of this method only involves eliminating bubbles, and does not propose a solution to the sensory problems of tobacco produced by the slurry method.

[0004] CN111436636B discloses a method for preparing reconstituted tobacco using the slurry method and the product. The method uses the slurry method to coat the reconstituted tobacco slurry on a substrate, controls the moisture content of the coated slurry by drying, and obtains a tobacco sheet. Then, the tobacco sheet is stacked again on the basis of the tobacco sheet, and the above steps are repeated at least once to obtain a multi-layer tobacco sheet stacked reconstituted tobacco. The method uses an improved slurry method to prepare reconstituted tobacco, and the different tobacco sheets of the reconstituted tobacco can be directly glued without using adhesive, which has the advantages of low water consumption, simple process, short time consumption, etc. However, it still fails to solve the sensory problems of tobacco produced by the slurry method.

[0005] Therefore, how to provide a method to improve the sensory quality of reconstituted tobacco produced by the slurry process has become an urgent problem to be solved. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a method for improving the sensory quality of reconstituted tobacco leaves. Compared with existing technologies, the reconstituted tobacco leaves prepared by the method provided by the present invention exhibit significantly reduced woody, grassy, ​​burnt, bitter, and irritating properties, while significantly improved aroma, comfort, and aftertaste. The resulting heated cigarettes have a more pronounced aroma, greater smoke production, and better taste.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] This invention provides a method for improving the sensory quality of reconstituted tobacco leaves, the method comprising the following steps:

[0009] (1) The raw tobacco flakes are crushed to obtain tobacco powder;

[0010] (2) The fiber is mixed with water and defibriled, and then milled to obtain fiber slurry;

[0011] (3) Mix glycerin with adhesive, and then mix with water to obtain glycerin-adhesive mixture;

[0012] (4) The fiber slurry, glycerol-adhesive mixture, tobacco powder and biological enzymes are mixed and fermented to obtain slurry;

[0013] (5) Dry the slurry to obtain the finished reconstituted tobacco leaves;

[0014] Steps (1), (2), and (3) are not in any particular order.

[0015] Compared with existing technologies, the reconstituted tobacco prepared by the above method has significantly reduced woody, grassy, ​​burnt, bitter, and irritating properties, while significantly improving aroma, comfort, and aftertaste. The resulting heated cigarettes have a more pronounced aroma, a larger smoke output, and a better taste.

[0016] Preferably, the tobacco raw material in step (1) includes any one or a combination of at least two of the upper tobacco leaves, middle tobacco leaves, or lower tobacco leaves, and more preferably a combination of upper tobacco leaves, middle tobacco leaves, and lower tobacco leaves.

[0017] Preferably, the mass ratio of the upper tobacco leaves, middle tobacco leaves, and lower tobacco leaves is (1.5-2.5):(7-9):(1.5-2.5), wherein the number of upper tobacco leaves can be 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, or 2.5, etc.; the number of middle tobacco leaves can be 7, 7.5, 8, 8.5, or 9, etc.; and the number of lower tobacco leaves can be 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, or 2.5, etc., but is not limited to the values ​​listed above. Other unlisted values ​​within the above range are also applicable.

[0018] The specific tobacco leaf combination and its mass ratio mentioned above can effectively improve the sensory quality of heated cigarettes.

[0019] Preferably, the fiber in step (2) includes any one or a combination of at least two of coniferous wood fiber, broadleaf wood fiber or hemp pulp fiber, and more preferably a combination of coniferous wood fiber, broadleaf wood fiber and hemp pulp fiber.

[0020] The aforementioned specific fiber combination, through the synergistic effect of softwood fiber, hardwood fiber, and hemp pulp fiber, can significantly reduce the amount of fiber used while meeting the needs of reconstituted tobacco production, thereby reducing the impact of fiber on the sensory quality of reconstituted tobacco.

[0021] Preferably, the mass ratio of fiber to water in step (2) is 1:(15-25), such as 1:10, 1:15, 1:20 or 1:25, but not limited to the values ​​listed above. Other unlisted values ​​within the above range are also applicable.

[0022] Preferably, step (2) further includes pulping after fiber defiberization.

[0023] Preferably, the bio-enzyme in step (4) includes any one or a combination of at least two of the following: protease, pectinase, polyphenol oxidase, lipoxygenase, cellulase, or wood flour softening enzyme.

[0024] Preferably, the bioenzyme in step (4) is a combination of protease, pectinase, polyphenol oxidase, lipoxygenase, cellulase and wood softening enzyme.

[0025] Preferably, the mass ratio of the protease, pectinase, polyphenol oxidase, lipoxygenase, cellulase, and wood softening enzyme is (0.8-1.2):(1.5-2.5):(0.8-1.2):(1.5-2.5):(1.5-2.5):(1.5-2.5), wherein the proportion of protease can be 0.8, 0.9, 1, 1.1, or 1.2, etc.; the proportion of pectinase can be 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, or 2.5, etc.; and the proportion of polyphenol oxidase can be 0.8, 0.9, 1, etc. The amounts of lipoxygenase can be 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, or 2.5, etc.; the amounts of cellulase can be 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, or 2.5, etc.; and the amounts of wood flour softening enzyme can be 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, or 2.5, etc., but are not limited to the values ​​listed above. Other unlisted values ​​within the above range are also applicable.

[0026] Proteases and pectinases can remove impurities from the upper tobacco leaves and improve their aroma; polyphenol oxidases and lipoxygenases can enhance the aroma of the lower tobacco leaves and improve the aroma quantity; cellulases and wood flour softening enzymes can remove impurities from the fibers; the above-mentioned specific biological enzyme combination, through the use of six specific enzymes in compound formulation, works synergistically to effectively reduce the woody, green, burnt, bitter, and irritating properties of tobacco leaves, while improving the aroma, comfort, and aftertaste, thus enhancing the sensory effects.

[0027] Preferably, the fermentation temperature in step (4) is 40-55℃ and the time is 24-60h. The temperature can be 40℃, 41℃, 42℃, 43℃, 44℃, 45℃, 46℃, 47℃, 48℃, 49℃, 50℃, 51℃, 52℃, 53℃, 54℃ or 55℃, etc., and the time can be 24h, 30h, 35h, 40h, 45h, 50h, 55h or 60h, etc., but is not limited to the values ​​listed above. Other unlisted values ​​within the above range are also applicable.

[0028] Preferably, step (4) further includes emulsifying and defoaming the fermentation liquid after fermentation.

[0029] Preferably, in the slurry of step (4), the mass ratio of fiber, adhesive, glycerin, tobacco powder, water, and biological enzyme is (2-4):(3-5):(15-25):(70-90):(400-600):(0.2-0.6), wherein the number of parts of fiber can be 2, 2.5, 3, 3.5, or 4, the number of parts of adhesive can be 3, 3.5, 4, 4.5, or 5, and the number of parts of glycerin can be 15, ... The quantities of tobacco powder can be 16, 17, 18, 19, 20, 21, 22, 23, 24, or 25, etc. The quantities of water powder can be 70, 75, 80, 85, or 90, etc. The quantities of water can be 400, 450, 500, 550, or 600, etc. The quantities of enzymes can be 0.2, 0.3, 0.4, 0.5, or 0.6, etc., but are not limited to the values ​​listed above. Other unlisted values ​​within the above range are also applicable.

[0030] Preferably, the drying process in step (5) includes a first drying section and a second drying section;

[0031] Preferably, the first drying section includes at least four zones, with a temperature of 80-190℃ and a residence time of 10-15 min. After the first drying section, the moisture content of the tobacco leaves is 15-25%. The temperature can be 80℃, 90℃, 100℃, 110℃, 120℃, 130℃, 140℃, 150℃, 160℃, 170℃, 180℃, 190℃, etc., and the residence time can be 10 min, 11 min, 12 min, 13 min, 14 min, or 15 min, etc. The moisture content can be 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, or 25%, etc., but is not limited to the values ​​listed above. Other unlisted values ​​within the above range are also applicable.

[0032] Preferably, the second drying section includes at least two zones, with a temperature of 80-120℃ and a residence time of 10-15 min. After the second drying section, the moisture content of the tobacco leaves is 5-10%. The temperature can be 80℃, 85℃, 90℃, 95℃, 100℃, 105℃, 110℃, 115℃, or 120℃, etc., and the residence time can be 10 min, 11 min, 12 min, 13 min, 14 min, or 15 min, etc. The moisture content can be 5%, 6%, 7%, 8%, 9%, or 10%, etc., but is not limited to the values ​​listed above. Other unlisted values ​​within the above range are also applicable.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] This invention provides a method for improving the sensory quality of reconstituted tobacco leaves. Compared with existing technologies, the reconstituted tobacco leaves prepared by this method have significantly reduced woody, grassy, ​​burnt, bitter, and irritating properties, while significantly improving aroma, comfort, and aftertaste. The heated cigarettes produced from this method have a more pronounced aroma, a larger smoke output, and a better taste. Detailed Implementation

[0035] To further illustrate the technical means and effects of the present invention, the following describes the technical solution of the present invention in conjunction with preferred embodiments of the present invention. However, the present invention is not limited to the scope of the embodiments.

[0036] In the following examples, the tobacco leaves are sourced from Jiangsu China Tobacco Industry Co., Ltd.

[0037] The protease, pectinase, polyphenol oxidase, lipoxygenase, cellulase, and wood softening enzyme were all purchased from Guangdong Yiduoli Biotechnology Co., Ltd.

[0038] Example 1

[0039] This embodiment provides a method for improving the sensory quality of reconstituted tobacco leaves, the specific steps of which are as follows:

[0040] (1) The upper, middle and lower tobacco leaves are fed in a certain mass ratio (1:8:1). After loosening, removing hemp fibers, spreading and drying, the moisture content of the tobacco leaves is controlled at 9.0±1.0%. The dried tobacco leaves are fed into a crusher to form fragments of 1-2cm in size. The fragments are then vacuum fed into a mixing tank and mixed evenly. The motor frequency of the fragment mixing tank is 10Hz.

[0041] (2) The uniformly mixed fragments are vacuum fed into the coarse grinding mill for coarse grinding of tobacco powder. After coarse grinding, the tobacco powder is fed into the fine grinding mill for fine grinding. After fine grinding, the tobacco powder is fed into the buffer tank for mixing and buffering to obtain tobacco powder. The average particle size of the finely ground tobacco powder is between 100-160μm, and the proportion of particles below 100 mesh is ≤20%.

[0042] (3) Add the softwood fiber, hardwood fiber, hemp pulp fiber and water in a ratio of 1:2:1:80 to the fiber unwinding pot for 20 minutes. The frequency of the fiber unwinding pot motor is 50 Hz. After the fiber unwinding is completed, it enters the pulping machine for pulping to obtain fiber pulp. The frequency of the pulping machine motor is 50 Hz and the working current is 50 A. After pulping, the fiber freeness is ≥40°SR.

[0043] (4) Add glycerin and adhesive (sodium carboxymethyl cellulose) to the excipient tank at a mass ratio of 5:1 and stir evenly. The motor frequency is 20Hz, the stirring time is 20min, and the temperature is set to 20℃. Then mix it with water at a mass ratio of 1:5 in the excipient tank to obtain a glycerin-adhesive mixture. The motor frequency is 50Hz, the stirring time is 60min, and the temperature is set to 20℃.

[0044] (5) Mix protease, pectinase, polyphenol oxidase, lipoxygenase, cellulase and wood flour softening enzyme in a certain ratio (1:2:1:2:2:2) to prepare a compound biological enzyme preparation.

[0045] (6) The above-mentioned fiber slurry, glycerol-adhesive mixture, tobacco powder, and compound bio-enzyme preparation are added to the mixing tank and mixed evenly. The motor frequency is 50 Hz, the stirring time is 30 min, and the temperature is set to 30 ℃. After the above slurry is evenly mixed, the temperature of the mixing tank is set to 50 ℃. After reaching the set temperature, the mixture is stirred continuously for 48 h for bio-enzyme fermentation. Then, the slurry after bio-enzyme fermentation is emulsified by an emulsification pump and then enters a degassing tank for defoaming. The motor frequency is 30 Hz, the degassing time is 10 min, and the temperature is set to 20 ℃. The final slurry has a mass ratio of fiber, adhesive (sodium carboxymethyl cellulose), glycerol, tobacco powder, water, and compound bio-enzyme preparation of 3:4:20:80:500:0.4.

[0046] (7) The defoamed slurry is coated onto a steel belt, with a wet film thickness of 1000 μm, a coating width of 150 cm, and a blade height of 1.5 mm. The slurry coated on the steel belt is dried in the first drying section, during which bio-enzyme inactivation is performed at high temperature. Then, it enters the second drying section for further drying to form reconstituted tobacco leaves. After the reconstituted tobacco leaves are separated from the steel belt by a scraper, they are rolled, re-rolled, cut, and packaged to form finished reconstituted tobacco leaves. The temperature setting of the four zones in the first drying section is (80-190) ℃, and the reconstituted tobacco leaves stay in the first drying section for 10 min. After the first drying section, the moisture content of the reconstituted tobacco leaves is 15%. The temperature setting of the two zones in the second drying section is 100 ℃, and the reconstituted tobacco leaves stay in the second drying section for 15 min. After the second drying section, the moisture content of the reconstituted tobacco leaves is 10%.

[0047] Example 2

[0048] This embodiment provides a method for improving the sensory quality of reconstituted tobacco leaves. The specific steps are the same as in Embodiment 1, except that in step (1) the upper tobacco leaves are not added and the middle and lower tobacco leaves are proportionally distributed.

[0049] Example 3

[0050] This embodiment provides a method for improving the sensory quality of reconstituted tobacco leaves. The specific steps are the same as in Embodiment 1, except that in step (1) the middle tobacco leaves are not added and the upper and lower tobacco leaves are proportionally distributed.

[0051] Example 4

[0052] This embodiment provides a method for improving the sensory quality of reconstituted tobacco leaves. The specific steps are the same as in Embodiment 1, except that in step (1), no lower tobacco leaves are added and the middle tobacco leaves and the lower part of the upper tobacco leaves are reduced proportionally.

[0053] Example 5

[0054] This embodiment provides a method for improving the sensory quality of reconstituted tobacco leaves. The specific steps are the same as in Example 1, except that no coniferous wood fiber is added in step (3), and the reduced portion is allocated to broadleaf wood fiber and hemp pulp fiber in proportion.

[0055] Example 6

[0056] This embodiment provides a method for improving the sensory quality of reconstituted tobacco leaves. The specific steps are the same as in Example 1, except that in step (3), no hardwood fiber is added and the reduced portion is allocated to softwood fiber and hemp pulp fiber in proportion.

[0057] Example 7

[0058] This embodiment provides a method for improving the sensory quality of reconstituted tobacco leaves. The specific steps are the same as in Example 1, except that no hemp pulp fiber is added in step (3) and the reduced portion is allocated to broadleaf wood fiber and softleaf wood fiber in proportion.

[0059] Example 8

[0060] This embodiment provides a method for improving the sensory quality of reconstituted tobacco leaves. The specific steps are the same as in Example 1, except that in step (5), no protease is added and a portion is allocated proportionally to pectinase, polyphenol oxidase, lipoxygenase, cellulase and wood flour softening enzyme.

[0061] Example 9

[0062] This embodiment provides a method for improving the sensory quality of reconstituted tobacco leaves. The specific steps are the same as in Example 1, except that in step (5), pectinase is not added and a portion is proportionally allocated to protease, polyphenol oxidase, lipoxygenase, cellulase and wood flour softening enzyme.

[0063] Example 10

[0064] This embodiment provides a method for improving the sensory quality of reconstituted tobacco leaves. The specific steps are the same as in Example 1, except that in step (5), polyphenol oxidase is not added and a portion is proportionally allocated to pectinase, protease, lipoxygenase, cellulase and wood flour softening enzyme.

[0065] Example 11

[0066] This embodiment provides a method for improving the sensory quality of reconstituted tobacco leaves. The specific steps are the same as in Example 1, except that in step (5), lipoxygenase is not added and a portion is proportionally allocated to pectinase, polyphenol oxidase, protease, cellulase and wood flour softening enzyme.

[0067] Example 12

[0068] This embodiment provides a method for improving the sensory quality of reconstituted tobacco leaves. The specific steps are the same as in Example 1, except that in step (5), cellulase is not added and a portion is proportionally allocated to pectinase, polyphenol oxidase, lipoxygenase, protease and wood flour softening enzyme.

[0069] Example 13

[0070] This embodiment provides a method for improving the sensory quality of reconstituted tobacco leaves. The specific steps are the same as in Example 1, except that in step (5), wood flour softening enzyme is not added and a portion is allocated proportionally to pectinase, polyphenol oxidase, lipoxygenase, cellulase and protease.

[0071] Effect test:

[0072] The reconstituted tobacco leaves provided in Examples 1-13 were used to make heated cigarettes using the following method:

[0073] First, the reconstituted tobacco leaves are rolled into a cigarette core stick; second, the cigarette core stick is combined with a hollow composite filter stick to form a cigarette stick twice the length; third, a tipping paper is rolled onto the cigarette stick, and the rolled cigarette stick is cut in half in the middle to make two cigarettes; finally, the cigarettes are packed into boxes and cartons.

[0074] The central values ​​of the physical properties of the reconstituted tobacco leaves obtained above are based on a thickness of 0.25 mm, a width of 128 mm, and a basis weight of 180 g / m³. 2 The physical properties of the resulting tobacco core rods are controlled to a circumference of 22.20 mm, a length of 120 mm, and a pressure drop of 2200 Pa. The physical properties of the resulting heated cigarettes are controlled to a circumference of 22.80 mm, a length of 45 mm, and a draw resistance of 550 Pa. This ensures that the physical properties of the reconstituted tobacco leaves, tobacco core rods, and heated cigarettes are consistent, thus eliminating the impact of different physical properties on the sensory quality of the reconstituted tobacco leaves and heated cigarettes.

[0075] Subsequently, 10 sensory evaluation experts with tobacco industry sensory evaluation certificates were invited to conduct sensory quality evaluations on the heated cigarettes produced in Examples 1-13 in accordance with the provisions of the Jiangsu Tobacco Industry Co., Ltd. enterprise standard "Sensory Evaluation Method for Heated Cigarettes". The specific evaluation rules are shown in Table 1. The results are shown in Table 2.

[0076] Table 1

[0077]

[0078] Table 2

[0079]

[0080]

[0081] The data above shows that the method provided by the present invention can effectively reduce woody, grassy, ​​burnt, bitter, and irritating odors, while improving aroma, comfort, and aftertaste, resulting in a superior sensory effect. Comparative examples 1-13 show that the present invention, through the use of a specific combination of tobacco leaves, coniferous wood fiber, broadleaf wood fiber, and hemp pulp fiber, along with a specific combination of six enzymes, works synergistically to further improve the effectiveness of the method and enhance the sensory effect.

[0082] The applicant declares that this invention illustrates the method for improving the sensory quality of reconstituted tobacco leaves through the above embodiments, but this invention is not limited to the above embodiments, that is, it does not mean that this invention must rely on the above embodiments to be implemented. Those skilled in the art should understand that any improvements to this invention, equivalent substitutions of the raw materials of this invention, addition of auxiliary components, and selection of specific methods, etc., all fall within the protection scope and disclosure scope of this invention.

[0083] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0084] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

Claims

1. A method for improving the sensory quality of reconstituted tobacco leaves, characterized in that, The method includes the following steps: (1) The raw tobacco leaves are crushed to obtain tobacco powder; the raw tobacco leaves are a combination of upper tobacco leaves, middle tobacco leaves and lower tobacco leaves; the mass ratio of the upper tobacco leaves, middle tobacco leaves and lower tobacco leaves is (1.5-2.5):(7-9):(1.5-2.5); (2) The fiber is mixed with water and defibriled, and then milled to obtain fiber slurry; the fiber is a combination of coniferous wood fiber, broadleaf wood fiber and hemp pulp fiber; (3) Mix glycerin with adhesive, and then mix with water to obtain a glycerin-adhesive mixture; (4) The fiber pulp, glycerol-adhesive mixture, tobacco powder and biological enzyme are mixed and fermented to obtain pulp; the biological enzyme is a combination of protease, pectinase, polyphenol oxidase, lipoxygenase, cellulase and wood flour softening enzyme; the mass ratio of protease, pectinase, polyphenol oxidase, lipoxygenase, cellulase and wood flour softening enzyme is (0.8-1.2):(1.5-2.5):(0.8-1.2):(1.5-2.5):(1.5-2.5):(1.5-2.5); (5) Dry the slurry to obtain the finished reconstituted tobacco leaves; Steps (1), (2), and (3) are not in any particular order.

2. The method according to claim 1, characterized in that, The mass ratio of fiber to water in step (2) is 1:(15-25).

3. The method according to claim 1, characterized in that, The fermentation temperature in step (4) is 40-55℃ and the time is 24-60 h.

4. The method according to claim 1, characterized in that, Step (4) after fermentation also includes emulsifying and defoaming the fermentation liquid.

5. The method according to claim 1, characterized in that, In step (4), the mass ratio of fiber, adhesive, glycerin, tobacco powder, water, and biological enzyme in the slurry is (2-4):(3-5):(15-25):(70-90):(400-600):(0.2-0.6).

6. The method according to claim 1, characterized in that, The drying process described in step (5) includes a first drying section and a second drying section.

7. The method according to claim 6, characterized in that, The first drying section includes at least four zones, with a temperature of 80-190℃ and a residence time of 10-15 min. After the first drying section, the moisture content of the tobacco leaves is 15-25%.

8. The method according to claim 6, characterized in that, The second drying section includes at least two zones, with a temperature of 80-120℃ and a residence time of 10-15 min. After the second drying section, the moisture content of the tobacco leaves is 5-10%.

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