Reconstituted tobacco, preparation method thereof and heated cigarette

Abstract

The invention provides reconstituted tobacco and a preparation method thereof and a heated cigarette, and the preparation method of the reconstituted tobacco comprises the following steps: step S1, classifying tobacco mixed raw materials to obtain tobacco stem raw materials, tobacco leaf raw materials and tobacco powder raw materials; s2, the tobacco stem raw materials, the tobacco leaf raw materials and the tobacco powder raw materials are treated, and a cellulose solution corresponding to the tobacco stem raw materials, tobacco powder corresponding to the tobacco leaf raw materials and a tobacco powder concentrated solution corresponding to the tobacco powder raw materials are obtained; and S3, mixing the cellulose solution, the tobacco powder and the tobacco powder concentrated solution, and carrying out drying forming treatment to obtain the reconstituted tobacco. Different components in the tobacco raw materials are screened and grouped through a reasonable process, optimized utilization of resources can be achieved, and the reconstituted tobacco sheets with higher nicotine and tobacco component content compared with an existing method are obtained.

Description

Technical Field

[0001] This application belongs to the field of tobacco manufacturing, and specifically relates to a reconstituted tobacco leaf, a method for preparing the reconstituted tobacco leaf, and a heated cigarette. Background Art

[0002] As small-sized waste residues generated in the tobacco processing link, tobacco leaf fragments have long been mostly used for preparing reconstituted tobacco leaf sheets and extracting tobacco active ingredients (such as nicotine, etc.), aiming to improve the overall utilization efficiency of tobacco leaf resources.

[0003] However, due to the complex sources and uneven qualities of these fragment raw materials, and the low content of effective ingredients such as nicotine contained therein, if directly used for the preparation of reconstituted tobacco leaf sheets, the nicotine and tobacco component contents of the obtained products often fail to meet the high-quality requirements. Therefore, it is usually necessary to additionally add substances such as tobacco extracts for component supplementation. Taking the production process of paper-making method reconstituted tobacco leaf as an example, raw materials such as tobacco fragments need to go through processes such as extraction and concentration to make a coating solution, and then be evenly coated on a paper base sheet to increase the content of tobacco components in the sheet.

[0004] However, the existing technology generally adopts the method of synchronously homogenizing (such as grinding) tobacco sheets, fragments, and tobacco dust from different sources, and does not carry out refined classification and application according to the differential quality characteristics of the fragments. This processing method ignores the internal differences of the raw materials, resulting in large fluctuations in the quality of the sheet products and making it difficult to achieve stable high-quality output. Summary of the Invention

[0005] In view of this, the purpose of this application is to provide a reconstituted tobacco leaf, a method for preparing the same, and a heated cigarette to solve the above problems.

[0006] To solve the above technical problems, this application adopts the following technical solutions:

[0007] In a first aspect, this application provides a method for preparing a reconstituted tobacco leaf. The method for preparing the reconstituted tobacco leaf includes: Step S1: Classify the tobacco mixed raw materials to obtain a tobacco stem raw material, a tobacco leaf raw material, and a tobacco dust raw material; Step S2: Process the tobacco stem raw material, the tobacco leaf raw material, and the tobacco dust raw material respectively to obtain a cellulose solution corresponding to the tobacco stem raw material, tobacco powder corresponding to the tobacco leaf raw material, and a tobacco dust concentrated solution corresponding to the tobacco dust raw material; Step S3: Mix the cellulose solution, the tobacco powder, and the tobacco dust concentrated solution, and perform a drying and shaping process to obtain the reconstituted tobacco leaf.

[0008] Further, Step S1 includes: Step S10: Feed and mix the tobacco raw materials evenly to obtain the tobacco mixed raw materials; Step S11: Perform a winnowing-screen classification process on the tobacco mixed raw materials to obtain the tobacco stem raw material, the tobacco leaf raw material, and the tobacco dust raw material.

[0009] Further, step S11 includes: step A11: performing air separation treatment on the tobacco mixed raw material to obtain a tobacco stem raw material; step A12: performing screening treatment on the tobacco mixed raw material to obtain a tobacco leaf raw material and a tobacco dust raw material.

[0010] Further, step S11 includes: step B11: first performing air separation treatment on the tobacco mixed raw material to obtain a tobacco stem raw material; step B12: then performing screening treatment on the tobacco mixed raw material to obtain a tobacco leaf raw material and a tobacco dust raw material.

[0011] Further, the tobacco leaf raw material is tobacco leaf fragments with a size greater than 1 mm, and the tobacco dust raw material is tobacco dust with a size less than 1 mm.

[0012] Further, step S2 includes: step S21: performing soaking and defibrating treatment on the tobacco stem raw material to obtain a cellulose solution; step S22: performing grinding treatment on the tobacco leaf raw material to obtain tobacco powder; step S23: performing soaking and extraction treatment on the tobacco dust raw material to obtain a concentrated tobacco dust solution.

[0013] Further, step S3 includes: step S31: mixing and proportioning the cellulose solution, the tobacco powder, and the concentrated tobacco dust solution according to a preset ratio to obtain a tobacco cellulose composite solution; step S32: adding a flavoring agent to the tobacco cellulose composite solution and performing drying and shaping treatment to obtain reconstituted tobacco leaves.

[0014] Further, the flavoring agent includes at least one of the following: long fibers, and the weight ratio of the long fibers is 1% - 2%, 2% - 3%, or 3% - 5%; atomizing agents, and the weight ratio of the atomizing agents is 25% - 30%, 30% - 33%, or 33% - 35%; water, and the weight ratio of the water is 30% - 100%, 100% - 200%, or 200% - 300%; and sizing agents, and the weight ratio of the sizing agents is 2% - 3%, 3% - 4%, or 4% - 5%.

[0015] In a second aspect, the present application provides a reconstituted tobacco leaf, which is made by the above-mentioned method for preparing reconstituted tobacco leaves.

[0016] In a third aspect, the present application provides a heated cigarette, which includes the above-mentioned reconstituted tobacco leaves.

[0017] Among them, the aerosol-generating article is a smoking article, including an aerosol-forming substrate, which generates an aerosol that can be directly inhaled into the user's lungs through the user's mouth by heating. Preferably, the aerosol-forming substrate is a solid aerosol-forming substrate. The aerosol-forming substrate may include both solid and liquid components at the same time. Preferably, the aerosol-forming substrate includes nicotine. In some preferred embodiments, the aerosol-forming substrate includes tobacco.

[0018] Understandably, tobacco itself has a unique flavor and aroma, which is a key feature sought after by many aerosol-generating products. By extracting the active ingredients in tobacco and using them as part of the aerosol-generating matrix, the smoking experience of traditional tobacco products can be simulated. Nicotine is the main alkaloid in tobacco and is also sought after by many smokers. Adding tobacco extracts to the aerosol-generating matrix can ensure that the product contains the right amount of nicotine to meet the needs of users.

[0019] Aerosol generating device is used to describe a device that interacts with an aerosol-forming substrate of an aerosol generating article to generate an aerosol. Preferably, the aerosol generating device is a heated smoking article that interacts with an aerosol-generating substrate of an aerosol generating article to generate an aerosol that is directly inhalable into the lungs of a user through the user's mouth. The aerosol generating device may be a holder for a smoking article.

[0020] The power source can be any suitable power source, such as a DC voltage source, such as a battery. In one embodiment, the power source is a lithium-ion battery. Alternatively, the power source can be a nickel metal hydride battery, a nickel cadmium battery, or a lithium-based battery, such as lithium cobalt, lithium iron phosphate, lithium titanate, or a lithium polymer battery.

[0021] The control element may be a simple switch. Alternatively, the control element may be an electrical circuit and may include one or more microprocessors or microcontrollers.

[0022] The aerosol generating system may include an aerosol generating device and one or more aerosol generating products, wherein the aerosol generating device is equipped with a corresponding number of heating chambers to accommodate the aerosol generating products.

[0023] The heater can be an internal heater inserted into the aerosol generating product, an external heater located on the periphery of the aerosol generating product, or a heater combining the internal and external heaters; but it is not limited to these, as long as it can be used to heat the aerosol generating product to produce an aerosol that can be inhaled.

[0024] For example, the aerosol-forming material may be formed from a sheet of homogenised tobacco.

[0025] Alternatively or additionally, the aerosol-forming substrate may comprise a tobacco-free aerosol-forming material.For example, the aerosol-forming material may be a sheet comprising nicotine salt and an aerosol former.

[0026] In the present application, homogenised tobacco material means a material formed by agglomerating particulate tobacco.

[0027] In the present application, a sheet means a laminar element having a width and a length substantially greater than its thickness.

[0028] In the present application, aggregation is used to describe a sheet that is wound, folded, or compressed or shrunk substantially transversely to the longitudinal axis of the aerosol-generating article.

[0029] Preferably, the aerosol-forming substrate comprises an aggregated and textured sheet of homogenized tobacco material.

[0030] In the present application, a textured sheet means a sheet that has been curled, embossed, imprinted, perforated, or otherwise deformed. The aerosol-forming substrate may comprise an aggregated and textured sheet of homogenized tobacco material, which comprises a plurality of spaced-apart notches, protrusions, perforations, or combinations thereof. Preferably, the aerosol-forming substrate comprises an aggregated and curled sheet of homogenized tobacco material. The use of a textured sheet of homogenized tobacco material can advantageously facilitate the aggregation of the sheets of homogenized tobacco material to form the aerosol-forming substrate.

[0031] In the present application, a curled sheet means a sheet having a plurality of substantially parallel ridges or wrinkles. Preferably, when the aerosol-generating article has been assembled, the substantially parallel ridges or wrinkles extend along or parallel to the longitudinal axis of the aerosol-generating article. This advantageously facilitates the aggregation of the curled sheets of homogenized tobacco material to form the aerosol-forming substrate. However, it will be understood that the curled sheets of homogenized tobacco material for inclusion in the aerosol-generating article may alternatively or additionally have a plurality of substantially parallel ridges or wrinkles that are arranged at an acute or obtuse angle to the longitudinal axis of the aerosol-generating article when the aerosol-generating article has been assembled.

[0032] The aerosol-forming substrate comprising the homogenized tobacco sheet for use in the aerosol-generating article can be manufactured by manufacturing processes already available in the art, such as the roll pressing method, the slurry method, and the papermaking method.

[0033] Unless otherwise specifically stated below, the tobacco raw material used in the present application is the fragments (larger than 1 mm) collected from the threshing and redrying of Enshi Xuan'en B3F Yun 87 flue-cured tobacco leaves in Hubei in 2021.

[0034] The inventors also conducted experiments using the following flue-cured tobacco leaves: Enshi, Hubei B2F, C3F, X2F; Guiyang, Chenzhou B2F, C3F, X2F; Yongzhou, Hunan B3F, C3F, X2F; Sanmenxia, Henan B2F, C3F, X3F; Zunyi, Guizhou B2F, C3F, X2F; Dafang, Bijie, Guizhou B3F, C3F, X2F; Bijie, Guizhou B2F, C3F, X3F; Yuxi, Yunnan B3F, C3F, X2F; Kunming, Yunnan B2F, C3F, X2F; Dali, Yunnan B2F, C3F, X2F, including tobacco seed varieties such as Honghuadajinyuan, Cuibi No. 1, and Qinyan 96. In addition, the inventors also used burley tobacco (Enshi, Hubei), oriental tobacco (Baoshan, Yunnan, Xinjiang), cigar tobacco (Hubei, Sichuan, imported Indonesia, etc.), and sun-cured yellow tobacco (Northeast China, Nanxiong, Guangdong, Hezhou, Guangxi, etc.) for experiments. Unless otherwise specifically stated below, it means that this patent is equally applicable to the above raw materials.

[0035] As can be seen from the above technical solutions, the advantages and positive effects of the reconstituted tobacco, its preparation method, and the heated cigarette proposed in this application are as follows:

[0036] This application innovatively proposes a method for preparing reconstituted tobacco. By precisely screening tobacco raw materials from different sources, with different sizes and chemical compositions, and conducting meticulous classification and scientific grouping based on the differences in characteristics such as fragment size and texture, key components such as tobacco powder with a high nicotine content, cellulose solution, and tobacco concentrate are successfully extracted. This process not only optimizes the allocation of tobacco resources but also significantly improves the utilization efficiency of raw materials.

[0037] Specifically, during the screening and grouping process, large fragments rich in nicotine and tobacco components are used as the main raw materials for tobacco powder to ensure high-quality tobacco powder; while the fine tobacco stems with relatively low nicotine and tobacco component contents are cleverly transformed into cellulose resources to achieve the maximum utilization of resources; for tobacco dust with a small size and slightly higher impurity content, since its nicotine and tobacco component contents are moderate, it is used to prepare concentrated tobacco extract to further explore its potential value.

[0038] Through the above fine processing, reconstituted tobacco required for heated cigarettes is finally prepared. This reconstituted tobacco has the characteristics of a high nicotine content and a strong tobacco aroma. This technological breakthrough effectively solves the problems faced in the preparation of reconstituted tobacco from existing tobacco raw materials, such as insufficient content of tobacco components such as nicotine, large fluctuations in the quality of incoming fragments, and unstable product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The above content of this application and the following specific implementation manners will be better understood when read in conjunction with the accompanying drawings. It should be noted that the drawings are only examples of the claimed technical solutions.

[0040] Figure 1It is a flowchart of the method for preparing reconstituted tobacco provided by this application. Detailed implementation manners

[0041] The following details the detailed features and advantages of this application in the detailed implementation manners. The content is sufficient for any person skilled in the art to understand the technical content of this application and implement it accordingly. And according to the specification, claims and drawings disclosed in this specification, those skilled in the art can easily understand the relevant purposes and advantages of this application.

[0042] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0043] In the description of this embodiment, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product is usually placed during use. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this application.

[0044] To make the purpose, technical solutions and advantages of this application clearer, the following will further describe the implementation manners of this application in detail with reference to the drawings.

[0045] Please refer to Figure 1 , this application provides a method for preparing reconstituted tobacco. The steps of this method for preparing reconstituted tobacco are specifically as follows:

[0046] Step S1: Classify the tobacco mixed raw materials to obtain stem raw materials, leaf raw materials and dust raw materials.

[0047] Specifically, step S1 may include:

[0048] Step S10: Feed and uniformly mix the tobacco raw materials to obtain the tobacco mixed raw materials.

[0049] The tobacco raw materials may be leaf fragment raw materials. Among them, the size of the leaf fragment raw materials is greater than 1 mm. The leaf fragment raw materials are formulated according to their sources, fragment size and main chemical components, etc., and are fed and uniformly mixed to obtain the tobacco mixed raw materials.

[0050] Exemplarily, the source of the leaf fragment raw materials may be the leaf type, and the leaf type includes sun-cured tobacco, flue-cured tobacco, oriental tobacco, etc. The source of the leaf fragment raw materials may also be the leaf position, and the leaf position includes the upper part, the lower part, etc.

[0051] The fragment size can be divided into those larger than 2.36 mm and those between 1 mm and 2.36 mm.

[0052] The main chemical components can be nicotine, total sugar content, etc. Among them, nicotine > 2.5% and total sugar content < 10%.

[0053] This application provides the following embodiments of tobacco blending raw materials for reference:

[0054] Formulation design of Example 1 - Flue-cured tobacco flavor

[0055] 1. Upper parts of flue-cured tobacco from Enshi, Hubei (B2F, B3F), large fragments (larger than 2.36 mm) 20%;

[0056] 2. Upper parts of flue-cured tobacco from Hunan (B2F, B3F), fragments (larger than 1 mm) 20%;

[0057] 3. Flue-cured tobacco from Henan (upper B2F, middle C3F), fragments (larger than 2.36 mm) 20%;

[0058] 4. Flue-cured tobacco from Yunnan (upper B2F, middle C3F), fragments (larger than 1 mm) 20%;

[0059] 5. Flue-cured tobacco from Guizhou (B2F, B3F), large fragments (larger than 2.36 mm) 10%;

[0060] 6. Sun-cured tobacco from Nanxiong, Guangdong, fragments (larger than 1 mm) 10%.

[0061] Mix the tobacco raw materials from 1 to 6 above to obtain a tobacco blending raw material with flue-cured tobacco flavor.

[0062] Formulation design of Example 2 - Strong flavor direction

[0063] 1. Upper parts of flue-cured tobacco from Enshi, Hubei (B2F, B3F), large fragments (larger than 2.36 mm) 20%;

[0064] 2. Upper parts of flue-cured tobacco from Hunan (B2F, B3F), fragments (larger than 1 mm) 20%;

[0065] 3. Flue-cured tobacco from Henan (upper B2F, middle C3F), fragments (larger than 1 mm) 20%;

[0066] 4. Sun-cured tobacco from Hezhou, Guangxi, fragments (upper part, larger than 1 mm) 10%;

[0067] 5. Burley tobacco from Enshi, Hubei (upper B2F, middle C3F), fragments (larger than 1 mm) 15%;

[0068] 6. Cigar tobacco, fragments (mixed, larger than 1 mm) 10%;

[0069] 7. Yunnan oriental tobacco (A1) 5%.

[0070] Mix the tobacco raw materials of the above 1 - 7 to obtain a tobacco mixed raw material in the strong flavor direction.

[0071] Formulation design of Example 3 - light flavor direction

[0072] 1. Enshi flue - cured tobacco in Hubei (B2F, C3F), large fragments (greater than 2.36 mm) 20%;

[0073] 2. Henan flue - cured tobacco (upper B2F, middle C3F), fragments (greater than 1 mm) 20%;

[0074] 3. Yunnan flue - cured tobacco, fragments (upper and middle parts, greater than 1 mm) 20%;

[0075] 4. Guizhou flue - cured tobacco (upper B2F, middle C3F), fragments (greater than 1 mm) 20%;

[0076] 5. Nanxiong sun - cured tobacco in Guangdong, fragments (upper part, greater than 1 mm) 20%.

[0077] Mix the tobacco raw materials of the above 1 - 5 to obtain a tobacco mixed raw material in the light flavor direction.

[0078] It should be noted that the formulation design of the tobacco mixed raw materials in Examples 1 - 3 is for reference only, and the specific protection scope is not limited thereto.

[0079] Step S11: Conduct pneumatic separation - screen classification on the tobacco mixed raw material to obtain a tobacco stem raw material, a tobacco leaf raw material, and a tobacco dust raw material.

[0080] Specifically, step S11 may include: Step A11: Conduct pneumatic separation on the tobacco mixed raw material to obtain a tobacco stem raw material. Step A12: Conduct screen processing on the tobacco mixed raw material to obtain a tobacco leaf raw material and a tobacco dust raw material.

[0081] Preferably, step S11 may first conduct pneumatic separation on the tobacco mixed raw material to obtain a tobacco stem raw material, and then conduct screen processing on the tobacco mixed raw material to obtain a tobacco leaf raw material and a tobacco dust raw material.

[0082] Exemplarily, the tobacco leaf raw material is tobacco leaf fragments, and the tobacco dust raw material is tobacco dust. By adopting the combined process of first pneumatic separation and then screen screening, the tobacco mixed raw material can be effectively separated into three components:

[0083] One is the fine tobacco stems removed by pneumatic separation. These tobacco stems mainly show non - leaf structural characteristics, mainly vein structures, and are rich in fiber components;

[0084] The second is the tobacco leaf fragments with a size greater than 1 mm obtained by screen screening;

[0085] Thirdly, there is tobacco dust with a size less than 1 mm.

[0086] Alternatively, the tobacco mixed raw material is first subjected to screening to obtain tobacco leaf raw material and tobacco dust raw material, and then subjected to winnowing to obtain tobacco stem raw material. The present application is not limited thereto.

[0087] Step S2: Treat the tobacco stem raw material, tobacco leaf raw material and tobacco dust raw material respectively to obtain a cellulose solution corresponding to the tobacco stem raw material, tobacco powder corresponding to the tobacco leaf raw material and a concentrated tobacco dust solution corresponding to the tobacco dust raw material.

[0088] Specifically, step S2 may include:

[0089] Step S21: Soak and defibrate the tobacco stem raw material to obtain a cellulose solution.

[0090] Exemplarily, the fine tobacco stem raw material selected by winnowing is soaked and defibrated with warm water to prepare a uniform cellulose solution for standby. Among them, the warm water is water with a temperature higher than 60°C.

[0091] Step S22: Grind the tobacco leaf raw material to obtain tobacco powder.

[0092] Exemplarily, after the tobacco mixed raw material is screened by a sieve, tobacco leaf fragments larger than 1 mm are obtained. The tobacco leaf fragments are ground to obtain tobacco powder with a particle size of about 100 mesh, and a binder in a set proportion (2%-5%) is added for standby.

[0093] Step S23: Soak and extract the tobacco dust raw material to obtain a concentrated tobacco dust solution.

[0094] Exemplarily, after the tobacco mixed raw material is screened by a sieve, tobacco dust smaller than 1 mm is obtained. The tobacco dust is soaked and extracted with warm water or an ethanol / water solution for 1-2 h, and edible alkali (about 1%) etc. can also be added according to needs. The distilled component is concentrated and used for standby.

[0095] It can be understood that by adopting the warm water soaking and extraction process, the concentrated solution prepared has a rich and mellow aroma, and has a significant effect in enhancing the strength and concentration of the product.

[0096] If an ethanol / water solution is selected for soaking and extraction, the obtained concentrated solution is excellent in enhancing the aroma, and can also enhance the concentration and strength of the product to a certain extent.

[0097] In the actual application process, the extraction method can be flexibly selected according to specific needs: if it is desired that the sheet product has a higher concentration and strength, warm water soaking and extraction is preferably selected. If it is pursued that the sheet product has a more excellent aroma performance, then ethanol / water solution soaking and extraction is more suitable.

[0098] By adding edible alkali, the pH value of the solution can be adjusted to a weakly alkaline state, and this adjustment greatly promotes the extraction and concentration process of effective components such as nicotine, thereby significantly enhancing the application efficiency of the prepared concentrated solution.

[0099] Step S3: Mix the cellulose solution, tobacco powder and concentrated tobacco dust solution, and perform drying and shaping treatment to obtain reconstituted tobacco leaves.

[0100] Specifically, step S3 may include:

[0101] Step S31: According to a preset ratio, mix the cellulose solution, tobacco powder and concentrated tobacco dust solution to obtain a tobacco cellulose composite solution.

[0102] Step S32: Add flavoring agents to the tobacco cellulose composite solution, and perform drying and shaping treatment to obtain reconstituted tobacco leaves.

[0103] Specifically, the tobacco powder, cellulose solution, and concentrated tobacco dust solution are in a certain ratio. For example: 100 parts of tobacco powder, 10 - 20 parts, 20 - 30 parts of cellulose solution, 10 - 40 parts, 40 - 70 parts of concentrated tobacco dust solution.

[0104] Flavoring agents such as long fibers, atomizing agents, water, and sizing agents can be additionally added. After uniform mixing, the reconstituted tobacco leaves are formed, dried, and prepared by methods such as the roll - pressing method or the thick - slurry method.

[0105] Exemplarily, the weight ratio of long fibers is 1% - 2%, 2% - 3%, or 3% - 5%.

[0106] The weight ratio of the atomizing agent is 25% - 30%, 30% - 33%, or 33% - 35%.

[0107] The weight ratio of water is 30% - 100%, 100% - 200%, or 200% - 300%.

[0108] The weight ratio of the sizing agent is 2% - 3%, 3% - 4%, or 4% - 5%.

[0109] The atomizing agent can be glycerol, propylene glycol, etc. The sizing agent can be carboxymethyl cellulose, sodium alginate, modified starch, guar gum, etc.

[0110] The reconstituted tobacco leaves are formed, dried, and prepared by methods such as the roll - pressing method or the thick - slurry method.

[0111] Exemplarily, the preparation method by the roll - pressing method is as follows:

[0112] 1. Use the mixture of tobacco powder and binder as the dry material.

[0113] 2. The cellulose solution is additionally added with long fibers in a set ratio of (1% - 5%) to obtain a cellulose solution, a tobacco dust concentrate (20%, calculated based on the total mass of tobacco), (25% - 35%) atomizing agent (glycerol, propylene glycol), and water (10 - 30%). After uniform mixing, a liquid material is obtained.

[0114] 3. Then, the dry material and the liquid material are further mixed evenly by stirring, and are roll-pressed multiple times to prepare a tobacco sheet. After drying at a low temperature (<105°C), a roll-pressed sheet product with a moisture content of 7% ± 1.5% is obtained.

[0115] The preparation method by the thick slurry method is as follows:

[0116] 1. A mixture of tobacco powder and an adhesive is used as the dry material.

[0117] 2. The cellulose solution is additionally added with long fibers in a set ratio of (1% - 5%) to obtain a cellulose solution, a tobacco dust concentrate (20% - 80%, calculated based on the total mass of tobacco), (25% - 35%) atomizing agent (glycerol, propylene glycol), and water (220% - 280%). After uniform mixing, a liquid material is obtained.

[0118] 3. Then, the dry material and the liquid material are further mixed evenly by stirring to prepare a thick slurry, which is spread on a forming steel plate. After drying at a low temperature (<105°C), a thick slurry method sheet product with a moisture content of 7% ± 1.5% is obtained.

[0119] Based on the same inventive concept, the present application also provides a reconstituted tobacco leaf, which is made by the above-mentioned reconstituted tobacco leaf preparation method.

[0120] It can be understood that the specific material parameters of the reconstituted tobacco leaf provided by the present application correspond to the reconstituted tobacco leaf preparation method provided by the present application. To make the description in the specification concise, the same or similar parts can refer to the content in the reconstituted tobacco leaf preparation method section, and will not be elaborated here.

[0121] Based on the same inventive concept, the present application also provides a heat-not-burn cigarette, which includes the above-mentioned reconstituted tobacco leaf.

[0122] Exemplarily, the obtained reconstituted tobacco leaf is prepared into a thin sheet raw material for a heat-not-burn cigarette by methods such as cutting or slitting into rolls, and a cigarette rod section is prepared, and further compounded and twisted with a filter rod section to prepare a heat-not-burn cigarette.

[0123] It should be understood that the term "and / or" in this text is merely a description of the association relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. Here, A and B can be singular or plural. Additionally, the character " / " in this text generally represents an "or" relationship between the associated objects before and after, but it may also represent an "and / or" relationship, and the specific meaning can be understood by referring to the context before and after.

[0124] It should be understood that in various embodiments of the present application, the magnitudes of the sequence numbers of the above processes do not indicate the order of execution. The order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

[0125] The terms and expressions used herein are only for description, and the present application should not be limited to these terms and expressions. Using these terms and expressions does not mean excluding any equivalent features of the illustration and description (or parts thereof). It should be recognized that various modifications that may exist should also be included within the scope of the claims. Other modifications, variations, and substitutions may also exist. Correspondingly, the claims should be regarded as covering all such equivalents.

[0126] Similarly, it should be noted that although the present application has been described with reference to the current specific embodiments, those of ordinary skill in the art in this technical field should recognize that the above embodiments are only used to illustrate the present application. Various equivalent changes or substitutions can be made without departing from the spirit of the present invention. Therefore, as long as the changes and variations of the above embodiments are within the scope of the spirit of the present application, they will fall within the scope of the claims of the present application.

Claims

1. A method for preparing reconstituted tobacco, characterized in that: The reconstituted tobacco preparation method comprises: Step S1: classifying the tobacco mixed raw material to obtain tobacco stem raw material, tobacco leaf raw material and tobacco dust raw material; Step S2: respectively processing the tobacco stem raw material, the tobacco leaf raw material and the tobacco dust raw material to obtain a cellulose solution corresponding to the tobacco stem raw material, tobacco powder corresponding to the tobacco leaf raw material and a tobacco dust concentrate corresponding to the tobacco dust raw material; Step S3: mixing the cellulose solution, the tobacco powder and the tobacco powder concentrate, and performing drying and molding treatment to obtain reconstituted tobacco leaves.

2. The method for preparing reconstituted tobacco according to claim 1, characterized in that: The step S1 comprises: Step S10: feeding the tobacco raw material and mixing it evenly to obtain the tobacco mixed raw material; Step S11: performing air selection and screen classification processing on the tobacco mixed raw material to obtain the tobacco stem raw material, the tobacco leaf raw material and the tobacco dust raw material.

3. The method for preparing reconstituted tobacco according to claim 2, characterized in that: The step S11 comprises: Step A11: performing air separation on the tobacco mixed raw material to obtain the tobacco stem raw material; Step A12: Screening the tobacco mixed raw material to obtain the tobacco leaf raw material and the tobacco dust raw material.

4. The method for preparing reconstituted tobacco according to claim 2, characterized in that: The step S11 comprises: Step B11: firstly performing air separation on the tobacco mixed raw material to obtain the tobacco stem raw material; Step B12: The tobacco mixed raw material is subjected to a sieve process to obtain the tobacco leaf raw material and the tobacco dust raw material.

5. The method for preparing reconstituted tobacco according to claim 1, characterized in that: The tobacco leaf raw material is tobacco leaf fragments with a size greater than 1 mm, and the tobacco dust raw material is tobacco dust with a size less than 1 mm.

6. The method for preparing reconstituted tobacco according to claim 1, characterized in that: The step S2 comprises: Step S21: soaking and defibrating the tobacco stem raw material to obtain the cellulose solution; Step S22: grinding the tobacco leaf raw material to obtain tobacco powder; Step S23: soaking and extracting the tobacco dust raw material to obtain the tobacco dust concentrate.

7. The method for preparing reconstituted tobacco according to claim 1, characterized in that: The step S3 comprises: Step S31: mixing the cellulose solution, the tobacco powder and the tobacco powder concentrate according to a preset ratio to obtain a tobacco-cellulose composite solution; Step S32: adding a flavor enhancer into the tobacco-cellulose composite solution, and performing drying and molding treatment to obtain the reconstituted tobacco leaf.

8. The method for preparing reconstituted tobacco according to claim 7, characterized in that: The flavor enhancer includes at least one of the following: Long fibers, wherein the weight percentage of the long fibers is 1% to 2%, 2% to 3%, or 3% to 5%; Atomizer, wherein the weight proportion of the atomizer is 25% to 30%, 30% to 33% or 33% to 35%; Water, wherein the weight percentage of the water is 30% to 100%, 100% to 200%, or 200% to 300%; and The rubber material has a weight ratio of 2% to 3%, 3% to 4% or 4% to 5%.

9. A reconstituted tobacco leaf, characterized in that: The reconstituted tobacco is made by the reconstituted tobacco preparation method according to any one of claims 1-8.

10. A heated cigarette, characterized in that: The heated cigarette comprises the reconstituted tobacco according to claim 9.

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