Reconstituted tobacco leaf, process for its preparation and heat-not-burn tobacco articles

Abstract

The application discloses a preparation process of reconstituted tobacco leaf, which comprises the following steps: subjecting tobacco leaf raw materials to fresh air hot air treatment, and storing the tobacco leaf raw materials to obtain primary tobacco leaves with a water content of 15-25%; subjecting the primary tobacco leaves to hot air drying to obtain secondary tobacco leaves, wherein the hot air drying time is 10-20 min; and crushing the secondary tobacco leaves and preparing reconstituted tobacco leaves through a thick slurry method. The preparation process of the reconstituted tobacco leaf can reduce peculiar smell and irritancy, improve tobacco baking original aroma, improve sensory comfort, and improve sensory quality through the steps of multi-stage fresh air hot air drying, high-intensity drying and storage to ensure the water content.

Description

Technical Field

[0001] This application relates to the field of heated tobacco products technology, and in particular to a process for preparing reconstituted tobacco leaves and heated tobacco products. Background Technology

[0002] New tobacco products mainly include heated tobacco products, e-cigarettes, and smokeless tobacco products. Among them, heated tobacco products have advantages such as low-temperature heating (below 500℃) instead of direct combustion, lower harm, and fashionable appearance, making them the most widely developed and fastest-growing mainstream new tobacco products. Currently, heated tobacco products mainly consist of two parts: heating devices and new tobacco products. New tobacco products are mainly divided into reconstituted tobacco leaves, shredded tobacco, and tobacco pellets according to different raw materials. Reconstituted tobacco leaves have become the main raw material for heated tobacco products due to their advantages such as good retention of tobacco components, strong plasticity, high homogenization, and high controllability.

[0003] In existing technologies, raw tobacco leaves are pulverized and mixed with water, adhesives, and additives in a specific ratio, then stirred evenly to form a slurry. This slurry is then evenly spread on a circulating metal belt, dried, and peeled to produce reconstituted tobacco. However, this method of directly preparing reconstituted tobacco from raw tobacco leaves using a slurry process, and then manufacturing it into heat-not-burn cigarettes, results in varying degrees of off-flavors and irritation when smoked, and a lack of pronounced natural tobacco aroma. Summary of the Invention

[0004] This invention provides a reconstituted tobacco leaf and its preparation process, as well as a heat-not-burn tobacco product, to solve the technical problems in the prior art where heat-not-burn cigarettes have impurities and are irritating, and the natural aroma of tobacco roasting is not significant.

[0005] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0006] A first aspect of the present invention provides a process for preparing reconstituted tobacco leaves, comprising the following steps:

[0007] S1. The tobacco raw material is treated with fresh air hot air and stored until the moisture content is 15% to 25% to obtain primary tobacco leaves; S2. The primary tobacco leaves are dried with hot air to obtain secondary tobacco leaves, and the hot air drying time is 10 min to 20 min; S3. The secondary tobacco leaves are crushed and then prepared into reconstituted tobacco leaves by the thick slurry method.

[0008] Furthermore, the hot air temperature for the fresh air hot air treatment in step S1 is 55℃~90℃.

[0009] Furthermore, the storage time in step S1 is 2h to 24h.

[0010] Furthermore, the hot air temperature for hot air drying in step S2 is 120℃~140℃.

[0011] Furthermore, it also includes coating the surface of the reconstituted tobacco leaf prepared in step S3 with a moisture-proofing agent.

[0012] Furthermore, the desiccant is selected from one or more of sodium alginate, chitosan, and stearic acid.

[0013] Further, step S3 specifically includes: pulverizing the second-grade tobacco leaves, mixing them with an atomizing agent, a binder, fiber, and a solvent to obtain a mixed slurry, coating the mixed slurry onto a metal strip, drying it, and then peeling it off to obtain reconstituted tobacco leaves.

[0014] Furthermore, the mass ratio of the pulverized second-grade tobacco leaves, the atomizing agent, the binder, and the fiber is 100:15-35:2-4:3-5.

[0015] Furthermore, the fiber is selected from one or more of the following: bleached sulfate pulp of broadleaf wood, bleached sulfate pulp of softleaf wood, and grass pulp.

[0016] Furthermore, the adhesive is selected from one or more of starch, dextrin, and polyvinyl alcohol.

[0017] Furthermore, before step S1, the method further includes: loosening and steam humidifying the tobacco raw material, wherein the temperature of the tobacco raw material after treatment is 60℃~90℃ and the moisture content of the tobacco raw material after treatment is 15%~25%.

[0018] Furthermore, before step S1, the tobacco raw material is subjected to a purification process to remove non-tobacco impurities.

[0019] In a second aspect, the present invention provides reconstituted tobacco leaves prepared by the above-described preparation process.

[0020] In a third aspect, the present invention provides a heat-not-burn tobacco product comprising the reconstituted tobacco leaf prepared by the above-described preparation process.

[0021] Furthermore, the heated tobacco product also includes existing reconstituted tobacco leaves, wherein the weight percentage of the existing reconstituted tobacco leaves is 5% to 50%.

[0022] The reconstituted tobacco preparation process provided by this invention involves treating tobacco raw materials with multi-stage fresh air and hot air. This process removes impurities and irritants without affecting the aroma style and quantity of the tobacco raw materials, improving sensory comfort and sensory quality. The storage step homogenizes the internal state of the tobacco raw materials, ensuring that the rehydration and temperature reach a sufficient equilibrium, thus improving the stability of moisture in the tobacco raw materials during subsequent processing. A relatively long hot air drying process of 10-20 minutes ensures effective drying, better highlighting the aroma style of the tobacco raw materials and reducing impurities and irritation. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a comparison chart of the water absorption and moisture absorption rates of reconstituted tobacco leaves in Example 1 and Comparative Example 1 of the present invention;

[0025] Figure 2 This is a comparison chart of the water absorption and moisture absorption rates of reconstituted tobacco leaves in Example 2 and Comparative Example 2 of the present invention;

[0026] Figure 3 This is a comparison chart of the water absorption and moisture absorption rates of reconstituted tobacco leaves in Example 3 and Comparative Example 3 of the present invention. Detailed Implementation

[0027] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" or "several" means two or more, unless otherwise explicitly specified.

[0029] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0030] A first aspect of this application provides a process for preparing reconstituted tobacco leaves, comprising the following steps: S1, subjecting tobacco leaf raw materials to fresh air hot air treatment and storing them until the moisture content is 15% to 25% to obtain primary tobacco leaves; S2, subjecting the primary tobacco leaves to hot air drying to obtain secondary tobacco leaves, wherein the hot air drying time is 10 min to 20 min; S3, pulverizing the secondary tobacco leaves and preparing reconstituted tobacco leaves by a slurry method.

[0031] The raw materials for tobacco leaves are complex and contain varying degrees of moisture. Directly processing sheet tobacco leaves into slurry-based reconstituted tobacco leaves and then manufacturing heated tobacco products can result in varying degrees of off-flavors and irritation when smoking, as well as a lack of pronounced tobacco roasting aroma, which directly affects the quality of heated tobacco products.

[0032] The reconstituted tobacco preparation process in this embodiment, through multi-stage fresh air and hot air treatment, high-intensity drying, and storage to ensure moisture content, can reduce off-odors and irritation, enhance the natural aroma of tobacco roasting, improve sensory comfort, and improve sensory quality. The aforementioned reconstituted tobacco preparation process treats the raw tobacco leaves through multi-stage fresh air and hot air treatment. Without affecting the aroma style and quantity of the raw tobacco leaves, fresh air is used to remove off-odors and irritation, improving sensory comfort and sensory quality. The storage step homogenizes the internal state of the raw tobacco leaves, ensuring that the rehydration and temperature reach a sufficient equilibrium, improving the stability of moisture in the raw tobacco leaves during subsequent processing. The relatively long hot air drying treatment of 10-20 minutes ensures the drying effect, better highlighting the aroma style of the raw tobacco leaves and reducing off-odors and irritation.

[0033] In this embodiment, the tobacco raw materials are treated with fresh air and hot air. This operation differs from traditional loosening and rehydration, which uses circulating hot air. This application uses fresh air and hot air, which can remove impurities from the tobacco raw materials. Multi-stage fresh air and hot air treatment can thoroughly remove substances that generate impurities and irritating gases from the tobacco raw materials. Specifically, the hot air temperature in step S1 is 55℃~90℃. Preferably, the hot air temperature is 75℃~85℃.

[0034] In this embodiment, the direction of the hot air during the hot air drying process can be continuously changed. The hot air drying process in this application differs from traditional drying processes, which typically last 2 to 5 minutes. The hot air drying time in this application is relatively long, ensuring a high-intensity, long-duration drying process to better highlight the aroma and flavor of the tobacco leaves. Preferably, the hot air temperature in step S2 is 120°C to 140°C.

[0035] In this embodiment of the application, storing tobacco raw materials can improve the stability of the moisture content of tobacco raw materials during subsequent processing. Preferably, the storage time in step S1 is 2h to 24h.

[0036] Existing reconstituted tobacco leaves contain a large amount of atomizing agent, making them highly susceptible to moisture absorption, leading to a series of problems such as excessively high tobacco temperature, poor compatibility with equipment, and oral discomfort. In some embodiments, the reconstituted tobacco leaf preparation process further includes coating the surface of the reconstituted tobacco leaves prepared in step S3 with a moisture-proofing agent. In the embodiments of this application, coating or spraying a moisture-proofing agent on the surface of the slurry-process reconstituted tobacco leaves can form a film on the surface, blocking the reconstituted tobacco leaves from contact with air, slowing down the rate of moisture absorption, and also providing a slow-release effect on the flavorings in the reconstituted tobacco leaves, thereby improving the sensory quality of the product. Furthermore, the moisture-proofing agent is selected from one or more of sodium alginate, chitosan, and stearic acid.

[0037] In some embodiments, step S3 specifically includes: pulverizing the second-grade tobacco leaves, mixing them with an atomizing agent, adhesive, fiber, and solvent to obtain a mixed slurry, coating the mixed slurry onto a metal strip, drying it, and then peeling it off to obtain reconstituted tobacco leaves. In this embodiment, the particle size of the pulverized second-grade tobacco leaves is 250-300 mesh; and the addition of fiber to the mixed slurry promotes hydrogen bonding between the fibers in the second-grade tobacco leaves and the added fibers, thereby improving the tensile strength of the reconstituted tobacco leaves. The mixed slurry is coated onto the metal strip to form a sheet of a specified width. In this embodiment, the sheet thickness is 0.15 mm to 0.4 mm. It is then dried and shaped, peeled off, and then dried at low temperature and shredded to obtain reconstituted tobacco leaves. The width of the shredded sheet is 0.8 mm to 1.1 mm, the length is 30 ± 15 mm, and the thickness is 0.15 mm to 0.4 mm.

[0038] In some embodiments, the mass ratio of pulverized second-stage tobacco leaves, atomizing agent, binder, and fiber is 100:15-35:2-4:3-5. The fiber is selected from one or more of bleached hardwood sulfate pulp, bleached softwood sulfate pulp, and alfalfa pulp. All pulp components in the fiber are added in equal proportions.

[0039] In some embodiments, the process further includes, before step S1, a step of loosening and steam humidifying the tobacco raw material. The temperature of the treated tobacco raw material is 60°C to 90°C, and its moisture content is 15% to 25%. This treatment loosens the tobacco raw material and continuously and uniformly humidifies it, resulting in soft tobacco leaves with a certain temperature and moisture content. This improves the toughness and processing resistance of the tobacco sheets, providing tobacco leaves that meet quality requirements for subsequent processes.

[0040] In some embodiments, step S1 is preceded by a purification process to remove non-tobacco impurities from the tobacco raw material. This purification process includes removing non-tobacco impurities such as metallic impurities and difficult-to-handle tobacco clumps from the tobacco raw material, which can further reduce the generation of off-gassing and irritating gases.

[0041] A second aspect of this application provides reconstituted tobacco leaves prepared by the above-described preparation process.

[0042] A third aspect of this application provides a heat-not-burn tobacco product, comprising reconstituted tobacco leaves prepared by the above-described preparation process. The reconstituted tobacco leaves can be used alone to prepare heat-not-burn tobacco products, or they can be blended with other existing reconstituted tobacco leaves and flavored to prepare heat-not-burn tobacco products. The blending ratio of other existing reconstituted tobacco leaves is 5% to 50%. This blending is used to form the atomized tobacco matrix segment, which can minimize impurities and irritating gases, enhance the natural roasted aroma of the tobacco, and slow down the rate of moisture absorption.

[0043] All reagents used in the following examples are commercially available.

[0044] Example 1

[0045] A process for preparing reconstituted tobacco leaves includes the following steps:

[0046] 1. Slice and loosen 10kg of tobacco raw material, then steam-humidify it. After steam humidification, the moisture content of the tobacco raw material is 20%, and the temperature of the tobacco raw material after treatment is 70℃.

[0047] 2. Remove impurities from the tobacco raw materials after step 1, such as by using a magnet and a hemp removal roller.

[0048] 3. The tobacco leaves processed in step 2 are subjected to a three-stage fresh air hot air treatment at a temperature of 60℃. Then, they are stored for 2 hours, maintaining the moisture content of the tobacco leaves at 19%, to obtain primary tobacco leaves.

[0049] 4. The primary tobacco leaves are dried with hot air at a temperature of 120℃ for 15 minutes to obtain the second-grade tobacco leaves.

[0050] 5. After pulverizing the second-grade tobacco leaves, tobacco powder is obtained, with the particle size controlled at 250 mesh. The tobacco powder is mixed with glycerol, starch, and fiber in a mass ratio of 100:30:2:3, and water is added to obtain a mixed slurry. The fiber includes bleached sulfate pulp from hardwood and bleached sulfate pulp from softwood in a mass ratio of 1:1. The mixed slurry is evenly coated onto a steel strip using a thickening method in a casting mold or casting box to form a sheet of a specified width and thickness of 0.4 mm. The sheet is then dried, shaped, and peeled off to obtain a primary sheet.

[0051] 6. Coat both surfaces of the primary sheet with a moisture-proofing agent. In this embodiment, the moisture-proofing agent is sodium alginate and chitosan in a 1:1 mass ratio. Then, dry at low temperature and shred to obtain reconstituted tobacco leaves. The reconstituted tobacco leaves have a width of 0.8 mm, a length of 20 mm, and a thickness of 0.3 mm.

[0052] A heated tobacco product includes existing reconstituted tobacco leaves and reconstituted tobacco leaves prepared by the above-mentioned preparation process, wherein the blending ratio of existing reconstituted tobacco leaves is 20%; the tobacco leaves are flavored at a ratio of 1.0%, sealed and boxed, and stored for 2 hours; then rolled and fitted with a multi-component composite filter rod on a cigarette rolling machine to produce heated tobacco cigarettes.

[0053] Example 2

[0054] A process for preparing reconstituted tobacco leaves includes the following steps:

[0055] 1. Slice and loosen 10kg of tobacco raw material, then steam-humidify it. After steam humidification, the moisture content of the tobacco raw material is 22%, and the temperature of the tobacco raw material after treatment is 70℃.

[0056] 2. Remove impurities from the tobacco raw materials after step 1, such as by using a magnet and a hemp removal roller.

[0057] 3. The tobacco leaves processed in step 2 are subjected to a three-stage fresh air hot air treatment at a temperature of 90℃. Then, they are stored for 5 hours, maintaining a moisture content of 20% to obtain primary tobacco leaves.

[0058] 4. The primary tobacco leaves are dried with hot air at a temperature of 140℃ for 10 minutes to obtain the second-grade tobacco leaves.

[0059] 5. After pulverizing the second-grade tobacco leaves, tobacco powder is obtained, with the particle size controlled at 300 mesh. The tobacco powder is mixed with glycerol, dextrin, and fiber in a mass ratio of 100:30:2:3, and water is added to obtain a mixed slurry. The fiber consists of bleached sulfate pulp from hardwood and bleached sulfate pulp from softwood in a mass ratio of 1:1. The mixed slurry is uniformly coated onto a steel strip using a thickening method in a casting mold or casting box to form a sheet of a specified width and thickness of 0.3 mm. The sheet is then dried, shaped, and peeled off to obtain a primary sheet.

[0060] 6. Coat both surfaces of the primary sheet with a moisture-proofing agent; in this embodiment, the moisture-proofing agent is sodium alginate. Then, dry at low temperature and shred to obtain reconstituted tobacco leaves. The reconstituted tobacco leaves have a width of 1.0 mm, a length of 30 mm, and a thickness of 0.2 mm.

[0061] A heated tobacco product includes existing reconstituted tobacco leaves and reconstituted tobacco leaves prepared by the above-mentioned preparation process, wherein the blending ratio of existing reconstituted tobacco leaves is 10%; the tobacco leaves are flavored at a ratio of 1.0%, sealed and boxed, and stored for 2 hours; then rolled and fitted with a multi-component composite filter rod on a cigarette rolling machine to produce heated tobacco cigarettes.

[0062] Example 3

[0063] A process for preparing reconstituted tobacco leaves includes the following steps:

[0064] 1. Slice and loosen 10kg of tobacco raw material, and steam humidify it. After steam humidification, the moisture content of the tobacco raw material is 20%, and the temperature of the tobacco raw material is 70℃.

[0065] 2. Remove impurities from the tobacco raw materials after step 1, such as by using a magnet and a hemp removal roller.

[0066] 3. The tobacco leaves processed in step 2 are subjected to a three-stage fresh air hot air treatment at a temperature of 75℃. Then, they are stored for 3 hours, maintaining the moisture content of the tobacco leaves at 19%, to obtain primary tobacco leaves.

[0067] 4. The primary tobacco leaves are dried with hot air at a temperature of 130℃ for 12 minutes to obtain the second-grade tobacco leaves.

[0068] 5. After pulverizing the second-grade tobacco leaves, tobacco powder is obtained, with the particle size controlled at 300 mesh. The tobacco powder is mixed with glycerol, polyvinyl alcohol, and fiber in a mass ratio of 100:30:2:3, and water is added to obtain a mixed slurry. The fiber includes bleached sulfate pulp of hardwood and bleached sulfate pulp of softwood in a mass ratio of 1:1. The mixed slurry is uniformly coated onto a steel strip using a thick slurry casting method in a mold or casting box to form a sheet of a specified width and thickness of 0.4 mm. The sheet is then dried, shaped, and peeled off to obtain a primary sheet.

[0069] 6. Coat both surfaces of the primary sheet with a moisture-proofing agent. In this embodiment, the moisture-proofing agent is chitosan and stearic acid in a 1:1 mass ratio. Then, dry at low temperature and shred to obtain reconstituted tobacco leaves. The reconstituted tobacco leaves have a width of 1.2 mm, a length of 20 mm, and a thickness of 0.3 mm.

[0070] A heated tobacco product includes reconstituted tobacco leaves prepared by the above-mentioned preparation process, without the use of existing reconstituted tobacco leaves for blending; flavoring the tobacco leaves at a ratio of 0.6%, sealing and packing them in boxes, and storing them for 2 hours; then rolling and attaching a multi-component composite filter rod on a cigarette rolling machine to produce heated tobacco cigarettes.

[0071] Comparative Example 1

[0072] Take 10 kg of tobacco leaves from the same batch as in Example 1, directly pulverize them, and mix them with glycerol, starch, and fiber in a mass ratio of 100:30:2:3, adding water to obtain a mixed slurry. The fiber includes hardwood bleached sulfate slurry and softwood bleached sulfate slurry in a mass ratio of 1:1. The mixed slurry is uniformly coated onto a steel strip using a thickening method in a casting mold or casting box to form a sheet of a specified width and thickness of 0.4 mm. It is then dried and shaped, and peeled off to obtain a primary sheet. The primary sheet is then dried at low temperature and shredded to obtain reconstituted tobacco. The reconstituted tobacco has a width of 0.8 mm, a length of 20 mm, and a thickness of 0.3 mm.

[0073] The reconstituted tobacco leaves of this comparative example are blended with existing reconstituted tobacco leaves at a blending ratio of 20%; the tobacco leaves are flavored at a flavoring ratio of 1.0%, sealed and boxed, and stored for 2 hours; then rolled and fitted with multi-component composite nozzles on a cigarette rolling machine to produce heated non-combustible cigarettes.

[0074] Comparative Example 2

[0075] Take 10 kg of tobacco leaves from the same batch as in Example 2, directly pulverize them, and mix them with glycerol, dextrin, and fiber in a mass ratio of 100:30:2:3, adding water to obtain a mixed slurry. The fiber includes hardwood bleached sulfate pulp and grass pulp in a mass ratio of 1:1. The mixed slurry is uniformly coated onto a steel strip using a thick slurry casting method in a mold or casting box to form a sheet of a specified width and thickness of 0.4 mm. It is then dried, shaped, and peeled off to obtain a primary sheet. The primary sheet is then dried at low temperature and shredded to obtain reconstituted tobacco. The reconstituted tobacco has a width of 1.0 mm, a length of 30 mm, and a thickness of 0.2 mm.

[0076] The reconstituted tobacco leaves of this comparative example are blended with existing reconstituted tobacco leaves at a blending ratio of 10%; the tobacco leaves are flavored at a flavoring ratio of 1.0%, sealed and boxed, and stored for 2 hours; then rolled and fitted with multi-component composite nozzle rods on a cigarette rolling machine to produce heated non-combustible cigarettes.

[0077] Comparative Example 3

[0078] Take 10 kg of tobacco raw materials from the same batch as in Example 3, directly pulverize them, and mix them with glycerol, polyvinyl alcohol, and fiber in a mass ratio of 100:28:3:5, and add water to obtain a mixed slurry. The fiber includes hardwood bleached sulfate pulp and grass pulp in a mass ratio of 1:1. The mixed slurry is uniformly coated onto a steel strip using a thick slurry casting method in a mold or casting box to form a sheet of a specified width and thickness of 0.4 mm. It is then dried and shaped, and peeled off to obtain a primary sheet. The primary sheet is then dried at low temperature and shredded to obtain reconstituted tobacco. The reconstituted tobacco has a width of 1.2 mm, a length of 20 mm, and a thickness of 0.3 mm.

[0079] The reconstituted tobacco leaves in this comparative example were flavored at a ratio of 0.6%, sealed and boxed, and stored for 2 hours. Then, they were rolled and fitted with multi-component composite nozzles on a cigarette rolling machine to produce heated non-combustible cigarettes.

[0080] Sensory evaluations were conducted on the heated tobacco products of Examples 1-3 and Comparative Examples 1-3, and the results are shown in Table 1. As can be seen from Table 1, compared to Comparative Examples 1-3, the tobacco aroma of Examples 1-3 was more abundant, the roasting aroma was more pronounced, the irritation was reduced, and the taste was cleaner and more pleasant. Therefore, the reconstituted tobacco preparation process provided in this application treats the tobacco raw materials with multi-stage fresh air hot air. Without affecting the aroma style and quantity of the tobacco raw materials, fresh air is used to remove impurities and irritating odors, improving sensory comfort and enhancing sensory quality. The relatively long hot air drying treatment of 10-20 minutes ensures the drying effect, better highlighting the aroma style of the tobacco raw materials and reducing impurities and irritation.

[0081] Table 1 Sensory evaluation results

[0082]

[0083] The reconstituted tobacco leaves prepared in Example 1 and Comparative Example 1 were placed in an environment with a temperature of 40°C and a humidity of 75%, and the water absorption and moisture absorption rates of the two were measured respectively. The results are as follows: Figure 1 As shown. The reconstituted tobacco leaves prepared in Example 2 and Comparative Example 2 were placed in an environment with a temperature of 25°C and a humidity of 40%, and their water absorption and moisture absorption rates were measured respectively. The results are as follows. Figure 2 As shown. The reconstituted tobacco leaves prepared in Example 3 and Comparative Example 3 were placed in an environment with a temperature of 35°C and a humidity of 60%, and their water absorption and moisture absorption rates were measured respectively. The results are as follows. Figure 3 As shown. The temperatures and humidityes in the above three experiments were different to examine the changes in water absorption and moisture absorption under different temperatures and humidity conditions in Examples 1-3 and Comparative Examples 1-3, which simulated different environments.

[0084] Depend on Figures 1 to 3 The comparison results show that the water absorption and moisture absorption rates of Examples 1 to 3 are lower than those of Comparative Examples 1 to 3, indicating that the reconstituted tobacco preparation process of this application can reduce the water absorption and moisture absorption rate of reconstituted tobacco and prevent the product from absorbing water and moisture too quickly, thus affecting the sensory quality.

[0085] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A process for preparing reconstituted tobacco leaves, characterized in that, Includes the following steps: S1. The tobacco raw material is treated with fresh air and hot air and stored until the moisture content is 15% to 25% to obtain primary tobacco leaves; the hot air temperature of the fresh air and hot air treatment in step S1 is 55℃ to 90℃. S2. The primary tobacco leaves are dried with hot air to obtain secondary tobacco leaves. The hot air drying time is 10 min to 20 min. The hot air temperature in step S2 is 120℃ to 140℃. S3. The second-grade tobacco leaves are pulverized and then processed by a slurry method to obtain the reconstituted tobacco leaves; the process also includes coating the surface of the reconstituted tobacco leaves obtained in step S3 with a moisture-proofing agent; the moisture-proofing agent is selected from one or more of sodium alginate, chitosan, and stearic acid.

2. The reconstituted tobacco preparation process according to claim 1, characterized in that, The storage time in step S1 is 2h to 24h.

3. The reconstituted tobacco preparation process according to claim 1 or 2, characterized in that, Step S3 specifically includes: pulverizing the second-grade tobacco leaves, mixing them with an atomizing agent, adhesive, fiber, and solvent to obtain a mixed slurry, coating the mixed slurry onto a metal strip, drying it, and then peeling it off to obtain reconstituted tobacco leaves.

4. The reconstituted tobacco preparation process according to claim 3, characterized in that, The mass ratio of the pulverized second-stage tobacco leaves, the atomizing agent, the binder, and the fiber is 100:15-35:2-4:3-5; and / or The fiber is selected from one or more of the following: bleached sulfate pulp from broadleaf wood, bleached sulfate pulp from softleaf wood, and grass pulp; and / or The adhesive is selected from one or more of starch, dextrin, and polyvinyl alcohol.

5. The reconstituted tobacco preparation process according to claim 1 or 2, characterized in that, Before step S1, the method further includes: loosening and steam humidifying the tobacco raw material, wherein the temperature of the tobacco raw material after treatment is 60℃~90℃ and the moisture content of the tobacco raw material after treatment is 15%~25%.

6. The process for preparing reconstituted tobacco leaves according to claim 1 or 2, characterized in that, Before step S1, the tobacco raw material is further subjected to a purification process to remove non-tobacco impurities.

7. A reconstituted tobacco leaf, characterized in that, The reconstituted tobacco leaves are prepared by the preparation process described in any one of claims 1 to 6.

8. A heated tobacco product, characterized in that, The reconstituted tobacco leaf prepared by the preparation process according to any one of claims 1 to 6.

9. The heated non-combustible tobacco product according to claim 8, characterized in that, The heated tobacco product also includes existing reconstituted tobacco leaves, which comprise 5% to 50% by weight.

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