Bamboo reconstituted tobacco and preparation method thereof

Abstract

The invention relates to the technical field of tobacco products, and discloses bamboo reconstituted tobacco and a preparation method thereof.The bamboo reconstituted tobacco is prepared from, by mass, 30-60 parts of tobacco pulp, 0-30 parts of tobacco stem pulp, 10-40 parts of bamboo pulp, 0-30 parts of wood pulp, 10-18 parts of filler, 2-8 parts of harm reducing agent and 0.5-10 parts of spice, and the harm reducing agent is formed by compounding bamboo-based activated carbon, eugenol and pyruvic acid. The preparation method comprises the following steps: mixing tobacco pulp, tobacco stem pulp, bamboo pulp, wood pulp, a filler and a harm reducing agent, and making the mixture into a reconstituted tobacco sheet substrate; and coating, drying and shredding the reconstituted tobacco sheet substrate by using the perfume to obtain the reconstituted tobacco. The content of harmful ingredients in the reconstituted tobacco can be effectively reduced, and the sensory quality of the reconstituted tobacco is improved.

Description

Technical Field

[0001] The invention relates to the technical field of tobacco products, and in particular to a bamboo reconstituted tobacco leaf and a preparation method thereof. Background Art

[0002] At present, papermaking reconstituted tobacco is a sheet or filamentary regenerated tobacco product made from tobacco materials such as tobacco dust, tobacco stems, and fragments as the main raw materials through technical processing and recombination. Among them, tobacco stems are mostly used to provide fibers to facilitate the molding of reconstituted tobacco leaves, but the fiber strength that tobacco stems can provide is limited, so a certain proportion of additional fibers (mainly wood pulp) needs to be added. During the papermaking process, it is highly dependent on wood pulp and consumes a large amount of long-fiber log resources. At the same time, the addition of tobacco stems and external fibers brings about disadvantages such as greater irritation, heavy wood smell, poor aroma, and poor aroma quantity.

[0003] The health hazards of smoking mainly come from the various harmful components contained in the smoke, among which carbon monoxide is a substance that is released in large quantities when cigarettes burn and poses a significant threat to human health. Carbon monoxide is a colorless, tasteless, and odorless gas that is not easily soluble in water at normal temperature and pressure, and is difficult to liquefy or solidify. Its physical properties are a melting point of -205°C and a boiling point of -191.5°C. From a chemical point of view, carbon monoxide can not only participate in the reaction as a reducing agent, but also has certain oxidizing properties, and can undergo a variety of chemical reactions including combustion. More importantly, carbon monoxide is toxic. When the human body inhales a high concentration of carbon monoxide, it may cause varying degrees of poisoning symptoms, affecting the functions of multiple organs such as the brain, heart, liver, kidneys, and lungs.

[0004] In recent years, as people's attention to cigarette safety continues to increase, the tobacco industry is facing increasingly stringent standards for the control of harmful substances. In order to adapt to this trend, the production of low-harm cigarettes has become one of the important directions for the development of the industry. In this context, how to effectively reduce the content of harmful components in reconstituted tobacco leaves and improve their safety has become a key issue that the entire tobacco industry needs to solve urgently. Summary of the invention

[0005] In view of this, the object of the present invention is to provide a bamboo reconstituted tobacco leaf and a preparation method thereof, which can effectively reduce the content of harmful components in the reconstituted tobacco leaf and improve the sensory quality of the reconstituted tobacco leaf.

[0006] The present invention solves the above technical problems by the following technical means: In a first aspect, the present invention discloses a bamboo reconstituted tobacco leaf, comprising the following raw materials in parts by weight: 30-60 parts of tobacco pulp, 0-30 parts of tobacco stem pulp, 10-40 parts of bamboo pulp, 0-30 parts of wood pulp, 10-18 parts of filler, 2-8 parts of harm reducer and 0.5-10 parts of fragrance, wherein the harm reducer is a composite of bamboo-based activated carbon, eugenol and pyruvic acid.

[0007] The ratio of tobacco pulp, tobacco stem pulp, bamboo pulp and wood pulp is optimized, and the natural flavor of tobacco is organically combined with the high strength, air permeability and natural bamboo fragrance of bamboo pulp to form a sheet base with good mechanical properties. The harm reduction agent is added, the core of which is the synergistic effect of bamboo-based activated carbon and natural extracts. The high specific surface area and adsorption capacity of bamboo-based activated carbon, as well as the antioxidant and chemical neutralization properties of natural extracts, are used to enhance the adsorption, catalysis and decomposition effects of harmful substances in smoke. Through the coordinated effect of fillers and spices, the molding performance and sensory experience of reconstituted tobacco leaves are further optimized, thereby achieving multi-dimensional performance improvement.

[0008] Preferably, the bamboo pulp is obtained by soaking, boiling, enzymolysis, high-concentration pulping, low-concentration pulping, screening and impurity removal, and squeezing the bamboo material.

[0009] Further preferably, the method for preparing the bamboo pulp comprises: soaking bamboo material, steaming, 4 times of high-concentration pulping, 2 times of enzymatic hydrolysis, low-concentration pulping, screening and squeezing to obtain the bamboo pulp.

[0010] Further preferably, the specific steps of preparing the bamboo pulp include: S1. The bamboo is soaked and then steamed to obtain bamboo A; S2. After the bamboo A is subjected to the first enzymatic hydrolysis, the solid-liquid separation is performed, and then the solid portion is subjected to 2 high-concentration refining, and then the second enzymatic hydrolysis and inactivation are performed, and the solid-liquid separation is again retained. S3. The obtained solid part is subjected to high-concentration refining twice to obtain bamboo fiber, and the pulp concentration is adjusted to 3%; low-concentration refining and pressure screening are then performed to remove impurities, and excess water is squeezed out to obtain the bamboo pulp.

[0011] Preferably, the pulp concentration of the high-concentration refining and defibration in steps S2 and A3 is 60%-80%, the enzyme preparation for the first enzymatic hydrolysis in step S2 is a mixed enzyme preparation of cellulase, xylanase, pectinase, amylase and laccase, the enzyme preparation for the second enzymatic hydrolysis is a mixed enzyme preparation of cellulase, xylanase, amylase and laccase, the pulp concentration of the low-concentration refining is 3%-3.2%, and the screen gap of the pressure screen is 0.2-0.5 mm.

[0012] The bamboo material is soaked and cooked to soften its structure and release the bonding force between fibers. Enzymatic hydrolysis is used to further decompose complex plant components such as cellulose, hemicellulose, pectin and starch through the synergistic action of cellulase, xylanase, pectinase, amylase and laccase, thereby improving the purity and uniformity of the fibers. The high-concentration refining and low-concentration refining steps gradually make the fiber structure broom-like through staged mechanical treatment, improving the softness and dispersibility of the fibers; and pressure screening to remove impurities ensures the purity of the final pulp. Precise control of pulp concentration and screen size minimizes fiber damage and retains fiber length and integrity, thereby ensuring that the physical and chemical properties of bamboo pulp are suitable for subsequent reconstituted tobacco processing.

[0013] Preferably, the filler is one or more of calcium carbonate, diatomaceous earth, bentonite and zeolite.

[0014] Preferably, the preparation method of the harm reducing agent comprises: A1. Wash the bamboo, cut it into small pieces, dry it until the moisture content is less than 10%, heat it to 200-400℃ in an oxygen-free or low-oxygen environment, and perform preliminary carbonization to obtain biochar; A2. The biochar was mixed with a zinc chloride solution, allowed to stand and soak for 1-2 hours, activated at 700-900°C, washed, dried, crushed, and sieved through a 300-600 mesh sieve to obtain bamboo-based activated carbon; A3. Soak bamboo-based activated carbon in dilute nitric acid for 0.5-1.5 hours, wash to neutral, and dry to obtain pretreated bamboo-based activated carbon; A4. A natural extract mixed solution is prepared by mixing eugenol and pyruvic acid in a ratio of 1:1; A5. The pretreated bamboo-based activated carbon is added to the natural extract mixed solution, ultrasonically treated for 10-20 minutes, allowed to stand for adsorption for 1-2 hours, and then glutaraldehyde is added, reacted at room temperature for 20-40 minutes, dried, and crushed to obtain the harm reducing agent.

[0015] Preferably, the mixing mass ratio of the biochar and zinc chloride in step A2 is 1:1-2, the mass concentration of the dilute nitric acid in step A3 is 5-10%, and the mass concentration of glutaraldehyde in step A5 is 0.5-1%.

[0016] The adsorption performance and chemical conversion capacity of harmful substances in flue gas were significantly improved by the synergistic treatment of bamboo-based activated carbon with eugenol and pyruvic acid. First, the bamboo material removed volatile substances and formed a preliminary porous structure during the initial carbonization process; the specific surface area and pore structure of biochar were further improved by zinc chloride activation, and its adsorption capacity was significantly enhanced. The bamboo-based activated carbon was pretreated with dilute nitric acid to remove surface impurities and introduce polar functional groups such as hydroxyl and carboxyl to increase its specific surface area and surface activity, providing more active sites for subsequent loading and chemical reactions. Then, eugenol and pyruvic acid were selected as composite natural extracts, which can effectively reduce the generation of free radicals and oxidative components in flue gas due to their good antioxidant and chemical activity. Then, these natural extracts were promoted to fully contact and evenly distribute with the pores of bamboo-based activated carbon under ultrasonic treatment, and glutaraldehyde was used as a cross-linking agent to form a stable chemical bond between the two, which not only enhanced the stability of the composite and prevented the loss of natural extracts during high-temperature combustion, but also improved its heat resistance and durability. The final harm reducer combines the efficient physical adsorption capacity and the chemical decomposition and transformation effect brought by natural extracts, together achieving effective control of harmful substances in tobacco smoke.

[0017] In a second aspect, the present invention discloses a method for preparing bamboo reconstituted tobacco, the preparation method comprising: Tobacco pulp, tobacco stem pulp, bamboo pulp, wood pulp, filler and harm reducing agent are mixed to prepare reconstituted tobacco sheet base sheet; the reconstituted tobacco sheet base sheet is coated with spices, dried and cut into shreds to obtain the reconstituted tobacco leaves.

[0018] Preferably, the drying controls the moisture content of the reconstituted tobacco product to be 8-12%.

[0019] Beneficial effects of the present invention: (1) The present invention significantly improves the mechanical strength, air permeability and combustion uniformity of reconstituted tobacco leaves, and uses harm reducers to effectively reduce the content of harmful substances such as tar and carbon monoxide in smoke, while improving the softness of smoke and the aroma release effect during smoking. Through the resource utilization of bamboo pulp and the efficient composite design of harm reducers, both green environmental protection and cost control requirements are taken into account.

[0020] (2) The bamboo pulp prepared by the present invention has high purity, high uniformity and good flexibility, and its fiber structure is more delicate and evenly distributed, which significantly improves the mechanical strength and processing performance of reconstituted tobacco leaves. Through multiple enzymatic hydrolysis and impurity removal processes, non-fiber components and impurities in the bamboo pulp are removed to the greatest extent, thereby improving the air permeability and combustion performance of bamboo fiber paper. The multi-step pulping treatment ensures the degree of fiber brooming, giving the reconstituted tobacco leaves excellent formability.

[0021] (3) In the production of reconstituted tobacco, bamboo pulp can replace part of wood pulp to bring many advantages. First, because bamboo pulp fibers are long and tough, they can enhance the mechanical strength of reconstituted tobacco, improve its folding resistance and tensile strength, and reduce the risk of breakage caused by mechanical stress. Second, the natural porous structure of bamboo pulp and its large fiber gaps help improve the air permeability of reconstituted tobacco, making the smoke smoother after ignition, thereby improving the smoking experience. In addition, bamboo pulp contains unique aromatic components, which give reconstituted tobacco a fresh bamboo fragrance, increasing the naturalness and attractiveness of the product.

[0022] (4) The harm reducer of the present invention significantly increases the specific surface area and porosity of bamboo-based activated carbon through zinc chloride activation, and can more efficiently adsorb particulate matter and gaseous harmful substances in flue gas. The bamboo-based activated carbon is then pretreated with dilute nitric acid to effectively improve the surface chemical properties of bamboo-based activated carbon, increase the number of its surface functional groups, improve its adsorption efficiency and binding ability with natural extracts, and after combining with composite natural extracts such as eugenol and pyruvic acid, significantly improve the adsorption capacity of harmful components such as tar and carbon monoxide in flue gas, and improve the adsorption efficiency by about 20%-25% compared with traditional activated carbon. At the same time, the natural extract can react with free radicals and other harmful substances in flue gas by virtue of its chemical activity, further reducing the concentration of harmful components; glutaraldehyde as a cross-linking agent not only enhances the loading stability of the extract on bamboo-based activated carbon, but also improves the heat resistance of the harm reducer under high-temperature combustion conditions, ensuring its long-term harm reduction effect. DETAILED DESCRIPTION

[0023] The following will be combined with the specific embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention: Example 1

[0024] A method for preparing bamboo reconstituted tobacco comprises: 30kg of tobacco pulp, 40kg of bamboo pulp, 10kg of filler and 2kg of harm reducing agent are mixed to prepare reconstituted tobacco sheet base sheet; 0.5kg of spices are applied to the reconstituted tobacco sheet base sheet, dried and cut into shreds to obtain reconstituted tobacco leaves.

[0025] The preparation method of bamboo pulp comprises: S1. 100kg of bamboo was soaked and then steamed to obtain 90kg of bamboo A; S2. After the bamboo material A is subjected to the first enzymatic hydrolysis treatment, the solid-liquid separation is performed, and the solid is then subjected to high-concentration pulping twice, followed by a second enzymatic hydrolysis and inactivation, and the solid-liquid separation is performed again to retain the solid portion; the concentration of the high-concentration pulp is 60%, and the enzyme preparation for the first enzymatic hydrolysis is a mixed enzyme preparation of cellulase, xylanase, pectinase, amylase, and laccase, and the specific mixing ratio is 200g bamboo: 0.05 cellulase: 0.15g xylanase: 0.15g pectinase: 0.4g amylase: 0.1g laccase. The enzyme preparation for the second enzymatic hydrolysis is a mixed enzyme preparation of cellulase, xylanase, amylase, and laccase, and the specific mixing ratio is 200g bamboo: 0.7 cellulase: 0.1g xylanase: 0.4g amylase: 0.1g laccase; S3. The solid part is subjected to high-concentration refining twice to obtain bamboo fiber, and the pulp concentration is adjusted to 3%; low-concentration refining and pressure screening are then performed to remove impurities, and excess water is squeezed out to obtain 44.62 kg of bamboo pulp. The pulp concentration of high-concentration refining is 60%, the pulp concentration of low-concentration refining is 3%, and the screen gap of the pressure screen is 0.2 mm.

[0026] The preparation method of the harm reducing agent comprises: A1. Wash 100 kg of bamboo, cut it into small pieces, dry it until the moisture content is less than 10%, heat it to 200°C in an oxygen-free or low-oxygen environment, and perform preliminary carbonization to obtain 30 kg of biochar; A2. The biochar was mixed with zinc chloride solution, allowed to stand and soak for 1 hour, activated at 700 ° C, washed, dried, crushed, and passed through a 300-mesh sieve to obtain 18 kg of bamboo-based activated carbon; A3 soak 18kg bamboo-based activated carbon with 34L mass concentration of 5% dilute nitric acid for 0.5 hours, washed to neutral, dried to obtain 17.5kg pretreated bamboo-based activated carbon; A4. A natural extract mixed solution is prepared by mixing eugenol and pyruvic acid in a ratio of 1:1; A5.17.5 kg of pretreated bamboo-based activated carbon was added to the mixed solution of natural extracts, ultrasonically treated for 10 minutes, allowed to stand for adsorption for 1 hour, and then glutaraldehyde was added and reacted at room temperature for 20 minutes. The mixture was dried and crushed to obtain 18.8 kg of harm reducer. Example 2

[0027] A method for preparing bamboo reconstituted tobacco comprises: 45kg of tobacco pulp, 15kg of tobacco stem pulp, 25kg of bamboo pulp, 15 parts of wood pulp, 14kg of filler and 5kg of harm reducing agent are mixed to prepare reconstituted tobacco sheet base sheet; 5.25kg of spices are applied to the reconstituted tobacco sheet base sheet, dried and cut into shreds to obtain reconstituted tobacco leaves.

[0028] The preparation method of bamboo pulp comprises: S1. 100kg of bamboo was soaked and then steamed to obtain 90kg of bamboo A; S2. After the bamboo material A is subjected to the first enzymatic hydrolysis treatment, the solid-liquid separation is performed, and the solid is then subjected to high-concentration pulping twice, followed by a second enzymatic hydrolysis and inactivation, and the solid-liquid separation is performed again to retain the solid portion; the concentration of the high-concentration pulp is 70%, and the enzyme preparation for the first enzymatic hydrolysis is a mixed enzyme preparation of cellulase, xylanase, pectinase, amylase, and laccase, and the specific mixing ratio is 200g bamboo: 0.05 cellulase: 0.15g xylanase: 0.15g pectinase: 0.4g amylase: 0.1g laccase. The enzyme preparation for the second enzymatic hydrolysis is a mixed enzyme preparation of cellulase, xylanase, amylase, and laccase, and the specific mixing ratio is 200g bamboo: 0.7 cellulase: 0.1g xylanase: 0.4g amylase: 0.1g laccase; S3. The solid part is subjected to high-concentration refining twice to obtain bamboo fiber, and the pulp concentration is adjusted to 3%; low-concentration refining and pressure screening are then performed to remove impurities, and excess water is squeezed out to obtain 44.62 kg of bamboo pulp. The pulp concentration of high-concentration refining is 70%, the pulp concentration of low-concentration refining is 3.1%, and the screen gap of the pressure screen is 0.35 mm.

[0029] The preparation method of the harm reducing agent comprises: A1. Wash 100 kg of bamboo, cut it into small pieces, dry it until the moisture content is less than 10%, heat it to 300°C in an oxygen-free or low-oxygen environment, and perform preliminary carbonization to obtain 30 kg of biochar; A2. The biochar was mixed with zinc chloride solution, allowed to stand and soak for 1.5 hours, activated at 800 ° C, washed, dried, crushed, and sieved through a 450 mesh sieve to obtain 18 kg of bamboo-based activated carbon; A3 soak 18kg bamboo-based activated carbon with 34L mass concentration of 12.5% ​​dilute nitric acid for 1 hour, washed to neutral, dried to obtain 17.5kg pretreated bamboo-based activated carbon; A4. A natural extract mixed solution is prepared by mixing eugenol and pyruvic acid in a ratio of 1:1; A5.17.5 kg of pretreated bamboo-based activated carbon was added to the mixed solution of natural extracts, ultrasonically treated for 15 minutes, allowed to stand for adsorption for 1.5 hours, and then glutaraldehyde was added. The mixture was reacted at room temperature for 30 minutes, dried and crushed to obtain 18.8 kg of harm reducer. Example 3

[0030] A method for preparing bamboo reconstituted tobacco comprises: 60kg of tobacco pulp, 30kg of tobacco stem pulp, 10kg of bamboo pulp, 30 parts of wood pulp, 18kg of filler and 8kg of harm reducing agent are mixed to prepare reconstituted tobacco sheet base sheet; 0.5-10kg of spices are applied to the reconstituted tobacco sheet base sheet, dried and cut into shreds to obtain reconstituted tobacco leaves.

[0031] The preparation method of bamboo pulp comprises: S1. 100kg of bamboo was soaked and then steamed to obtain 90kg of bamboo A; S2. After the bamboo material A is subjected to the first enzymatic hydrolysis treatment, the solid-liquid separation is performed, and the solid is then subjected to high-concentration pulping twice, followed by a second enzymatic hydrolysis and inactivation, and the solid-liquid separation is performed again to retain the solid portion; the concentration of the high-concentration pulp is 80%, and the enzyme preparation for the first enzymatic hydrolysis is a mixed enzyme preparation of cellulase, xylanase, pectinase, amylase, and laccase, and the specific mixing ratio is 200g bamboo: 0.05 cellulase: 0.15g xylanase: 0.15g pectinase: 0.4g amylase: 0.1g laccase. The enzyme preparation for the second enzymatic hydrolysis is a mixed enzyme preparation of cellulase, xylanase, amylase, and laccase, and the specific mixing ratio is 200g bamboo: 0.7 cellulase: 0.1g xylanase: 0.4g amylase: 0.1g laccase; S3. The solid part is subjected to high-concentration refining twice to obtain bamboo fiber, and the pulp concentration is adjusted to 3%; low-concentration refining and pressure screening are then performed to remove impurities, and excess water is squeezed out to obtain 44.62 kg of bamboo pulp. The pulp concentration of high-concentration refining is 80%, the pulp concentration of low-concentration refining is 3.2%, and the screen gap of the pressure screen is 0.5 mm.

[0032] The preparation method of the harm reducing agent comprises: A1. Wash 100 kg of bamboo, cut it into small pieces, dry it until the moisture content is less than 10%, heat it to 400°C in an oxygen-free or low-oxygen environment, and perform preliminary carbonization to obtain 30 kg of biochar; A2. The biochar was mixed with zinc chloride solution, allowed to stand and soak for 2 hours, activated at 900 ° C, washed, dried, crushed, and passed through a 600 mesh sieve to obtain 18 kg of bamboo-based activated carbon; A3 soak 18kg bamboo-based activated carbon with 34L mass concentration of 10% dilute nitric acid for 1.5 hours, washed to neutral, dried to obtain 17.5kg pretreated bamboo-based activated carbon; A4. A natural extract mixed solution is prepared by mixing eugenol and pyruvic acid in a ratio of 1:1; A5.17.5 kg of pretreated bamboo-based activated carbon was added to the mixed solution of natural extracts, ultrasonically treated for 20 minutes, allowed to stand for adsorption for 2 hours, and then glutaraldehyde was added. The mixture was reacted at room temperature for 40 minutes, dried and crushed to obtain 18.8 kg of harm reducer.

[0033] Comparative Example 1 The difference from Example 2 is that no bamboo pulp is added.

[0034] Comparative Example 2 The difference from Example 2 is that no harm reducing agent is added.

[0035] The finished cigarettes were produced and the project team's smoking evaluation personnel conducted sensory evaluation. The evaluation results are shown in Table 1.

[0036]

[0037] Nicotine was determined according to the national tobacco industry standard YC / T156 "Determination of Nicotine in Total Particles of Cigarettes". Carbon monoxide was determined according to the national tobacco industry standard YC / T30 "Determination of Carbon Monoxide in the Gas Phase of Cigarette Smoke". Total particle matter and tar in cigarette smoke were determined according to the national standard GB / T19609 "Determination of Total Particles and Tar by Cigarette Smoking Machine". The specific test results are shown in Table 2.

[0038]

[0039] As can be seen from Table 2, the tar content in the cigarette smoke of the reconstituted tobacco prepared by the present invention decreased by 1.4 mg / cigarette, with a reduction rate of 20.35%; the nicotine content decreased by 0.17 mg / cigarette, with a reduction rate of 6.1%; and the carbon monoxide content decreased by 2.04 mg / cigarette, with a reduction rate of 17.4%. It can be seen that the harm reducer can reduce the release of tar and carbon monoxide in cigarette smoke, and has an obvious tar-reducing and harm-reducing effect.

[0040] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should be included in the scope of the claims of the present invention. The techniques, shapes, and structural parts not described in detail in the present invention are all known technologies.

Claims

1. A bamboo reconstituted tobacco leaf, characterized in that: The invention comprises the following raw materials in parts by weight: 30-60 parts of tobacco pulp, 0-30 parts of tobacco stem pulp, 10-40 parts of bamboo pulp, 0-30 parts of wood pulp, 10-18 parts of filler, 2-8 parts of harm reducing agent and 0.5-10 parts of fragrance, wherein the harm reducing agent is a composite of bamboo-based activated carbon, eugenol and pyruvic acid.

2. The bamboo reconstituted tobacco according to claim 1, characterized in that: The method for preparing bamboo pulp comprises: soaking bamboo, steaming, enzymolysis, high-concentration pulping, low-concentration pulping, screening and removing impurities, and squeezing to obtain the bamboo pulp.

3. The bamboo reconstituted tobacco according to claim 2, characterized in that: The specific steps of preparing the bamboo pulp include: S1. The bamboo is soaked and then steamed to obtain bamboo A; S2. After the bamboo A is subjected to the first enzymatic hydrolysis, the solid-liquid separation is performed, and then the solid portion is subjected to 2 high-concentration refining, and then the second enzymatic hydrolysis and inactivation are performed, and the solid-liquid separation is again retained. S3. The obtained solid part is subjected to high-concentration refining twice to obtain bamboo fiber, and the pulp concentration is adjusted to 3%; low-concentration refining and pressure screening are then performed to remove impurities, and excess water is squeezed out to obtain the bamboo pulp.

4. The bamboo reconstituted tobacco according to claim 3, characterized in that: The pulp concentration of the high-concentration refining in steps S2 and S3 is 60%-80%, the enzyme preparation for the first enzymatic hydrolysis in step S2 is a mixed enzyme preparation of cellulase, xylanase, pectinase, amylase and laccase, the enzyme preparation for the second enzymatic hydrolysis is a mixed enzyme preparation of cellulase, xylanase, amylase and laccase, the pulp concentration of the low-concentration refining is 3%-3.2%, and the screen gap of the pressure screen is 0.2-0.5mm.

5. The bamboo reconstituted tobacco according to claim 1, characterized in that: The filler is one or more of calcium carbonate, diatomaceous earth, bentonite and zeolite.

6. The bamboo reconstituted tobacco according to claim 1, characterized in that: The preparation method of the harm reducing agent comprises: A1. Wash the bamboo, cut it into small pieces, dry it until the moisture content is less than 10%, heat it to 200-400℃ in an oxygen-free or low-oxygen environment, and perform preliminary carbonization to obtain biochar; A2. The biochar was mixed with a zinc chloride solution, allowed to stand and soak for 1-2 hours, and then activated at 700-900°C, washed, and dried to obtain bamboo-based activated carbon; A3. Soak bamboo-based activated carbon in dilute nitric acid for 0.5-1.5 hours, wash to neutral, and dry to obtain pretreated bamboo-based activated carbon; A4. A natural extract mixed solution is prepared by mixing eugenol and pyruvic acid in a ratio of 1:1; A5. The pretreated bamboo-based activated carbon is added to the natural extract mixed solution, ultrasonically treated for 10-20 minutes, allowed to stand for adsorption for 1-2 hours, and then glutaraldehyde is added, reacted at room temperature for 20-40 minutes, dried, and crushed to obtain the harm reducing agent.

7. The bamboo reconstituted tobacco according to claim 6, characterized in that: The mixing mass ratio of the biochar and zinc chloride in step A2 is 1:1-2, the mass concentration of the dilute nitric acid in step A3 is 5-10%, and the mass concentration of glutaraldehyde in step A5 is 0.5-1%.

8. A method for preparing bamboo reconstituted tobacco according to any one of claims 1 to 7, characterized in that: The preparation method comprises: Tobacco pulp, tobacco stem pulp, bamboo pulp, wood pulp, filler and harm reducing agent are mixed to prepare reconstituted tobacco sheet base sheet; the reconstituted tobacco sheet base sheet is coated with spices, dried and cut into shreds to obtain the reconstituted tobacco leaves.

9. The method for preparing bamboo reconstituted tobacco according to claim 8, characterized in that: The drying controls the moisture content of the reconstituted tobacco product to be 8-12%.

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