Reconstituted tobacco base with high inorganic filler content, reconstituted tobacco and preparation method of reconstituted tobacco base

Abstract

The invention discloses a high-inorganic-filler-content reconstituted tobacco sheet base, reconstituted tobacco and a preparation method thereof.The preparation method of the high-inorganic-filler-content reconstituted tobacco sheet base comprises the steps that tobacco raw materials are pulverized, and powdery tobacco raw materials are obtained; the deviation between the particle size median of the powdery tobacco raw material and the particle size median of the powdery inorganic filler is less than or equal to 20%; mixing the powdery tobacco raw material and the fiber raw material, and performing extraction treatment to obtain an extracting solution and solid residues; pulping the solid residues to obtain tobacco pulp; adding nanocellulose into the guar gum aqueous solution to obtain a mixed gum solution; adding the mixed glue solution and the powdery inorganic filler into the tobacco slurry to obtain mixed slurry; and carrying out papermaking molding on the mixed slurry, and drying to obtain the reconstituted tobacco base. According to the preparation method, the content of the inorganic filler in the reconstituted tobacco can be effectively increased.

Description

Technical Field

[0001] The present invention relates to the field of reconstituted tobacco leaf preparation, and more specifically, to a reconstituted tobacco leaf base with a high inorganic filler content, a reconstituted tobacco leaf and a preparation method thereof. Background Art

[0002] The preparation process of conventional papermaking reconstituted tobacco mainly includes extraction, solid-liquid separation, pulping, papermaking, concentration, coating, and baking. Inorganic fillers can be added in the papermaking process to increase the yield of the sheet base.

[0003] Due to the large differences in material properties (e.g., particle size, electrochemical properties, etc.) between inorganic fillers and tobacco slurry, the proportion of inorganic fillers that can be retained on the sheet base is relatively low. The actual content of inorganic fillers in conventional reconstituted tobacco products is 5-10%, which is only about one-third of the amount of inorganic fillers added.

[0004] Therefore, how to increase the content of inorganic fillers in reconstituted tobacco leaves has become a technical problem that urgently needs to be solved in this field. Summary of the invention

[0005] One object of the present invention is to provide a new technical solution for a method for preparing reconstituted tobacco which can effectively increase the content of inorganic fillers in the reconstituted tobacco.

[0006] According to a first aspect of the present invention, a method for preparing reconstituted tobacco leaf base with a high inorganic filler content is provided.

[0007] The method for preparing the reconstituted tobacco leaf base with high inorganic filler content comprises the following steps:

[0008] Step (1): pulverizing the tobacco raw material to obtain a powdered tobacco raw material, wherein the deviation between the median particle size of the powdered tobacco raw material and the median particle size of the powdered inorganic filler is less than or equal to 20%;

[0009] Step (2): mixing the powdered tobacco raw material and the fiber raw material and performing an extraction process to obtain an extract and a solid residue;

[0010] Step (3): pulping the solid residue to obtain tobacco pulp;

[0011] Step (4): adding nanocellulose to the guar gum aqueous solution to obtain a mixed gum solution;

[0012] Step (5): adding the mixed glue and the powdered inorganic filler into the tobacco slurry to obtain a mixed slurry;

[0013] Step (6): forming the mixed slurry into a sheet and drying it to obtain the reconstituted tobacco leaf base.

[0014] Optionally, the particle sizes of the powdered tobacco raw material and the powdered inorganic filler in step (1) are both 100-160 meshes.

[0015] Optionally, the deviation between the median particle size of the powdered tobacco raw material and the median particle size of the powdered inorganic filler in step (1) is less than 15% and greater than 10%.

[0016] Optionally, the fiber raw material in step (2) is a coniferous and / or hardwood pulp fiber pulp board, and the mass ratio of the powdered tobacco raw material to the fiber raw material is 100:(10-15);

[0017] The extraction treatment in step (2) is a water extraction treatment, and the parameters of the water extraction treatment are as follows: the mass ratio of the extract to water is 1:(7-10), the water temperature is 65°C-75°C, and the extraction time is 55min-65min.

[0018] Optionally, the beating degree of the beating treatment in step (3) is 55°SR-75°SR.

[0019] Optionally, the guar gum aqueous solution in step (4) is prepared by the following method: adding cationic guar gum to water at a stirring speed of 800-1600 r / min and stirring for 5-10 min to obtain a guar gum aqueous solution with a mass concentration of 0.1-0.5%;

[0020] The step (4) is specifically as follows:

[0021] Add nanocellulose to the guar gum aqueous solution at a stirring speed of 3200-3600 r / min and stir for 10-15 minutes to obtain a mixed glue solution, wherein the mass concentration of nanocellulose in the mixed glue solution is 0.1-1.0%.

[0022] Optionally, the drying temperature in step (6) is 90°C-120°C, the moisture content of the reconstituted tobacco leaf base is 15-25%, and the basis weight is 50-62 g / m 2 .

[0023] Optionally, the powdered inorganic filler is at least one of calcium carbonate and white carbon black, and the absolute dry weight ratio of the mixed glue, the powdered inorganic filler and the tobacco slurry is (0.5-1.5):(20-30):(70-80).

[0024] According to a second aspect of the present invention, a method for preparing reconstituted tobacco with a high inorganic filler content is provided.

[0025] The preparation method of the reconstituted tobacco with high inorganic filler content comprises the following steps:

[0026] The extract is coated on the reconstituted tobacco leaf base prepared by the method for preparing the reconstituted tobacco leaf base with high inorganic filler content of the present invention, and then dried to obtain the reconstituted tobacco leaf.

[0027] According to a third aspect of the present invention, there is provided a reconstituted tobacco leaf having a high inorganic filler content.

[0028] The reconstituted tobacco leaf with high inorganic filler content is prepared by the preparation method of the reconstituted tobacco leaf with high inorganic filler content according to the present invention, wherein the mass percentage of the powdered inorganic filler in the reconstituted tobacco leaf base is 15-25%.

[0029] The method for preparing the reconstituted tobacco leaf base with high inorganic filler content of the present invention has the following characteristics:

[0030] 1. By controlling the physical dimensions of powdered tobacco materials and powdered inorganic fillers, the retention rate of inorganic fillers can be improved while retaining tobacco raw materials.

[0031] 2. The retention rate of inorganic fillers is further improved by using retention aid guar gum.

[0032] 3. The overall electrochemical properties of the mixed slurry are adjusted by the hydroxyl groups carried by nanocellulose, avoiding the adverse effects on the sheet base caused by the increase in the content of inorganic fillers, adjusting the physical indicators of the reconstituted tobacco sheet base, and ensuring the applicability of the reconstituted tobacco sheet base.

[0033] 4. By increasing the content of inorganic fillers in the leaf base of reconstituted tobacco, the tar and CO release of reconstituted tobacco leaves can be reduced, reducing the adverse effects of the leaf base on the smoking quality of reconstituted tobacco leaves. DETAILED DESCRIPTION

[0034] Various exemplary embodiments of the present invention will now be described in detail. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

[0035] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0036] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0037] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0038] The method for preparing a reconstituted tobacco leaf base with a high inorganic filler content provided by the present invention comprises the following steps:

[0039] Step (1): Powdering the tobacco raw material to obtain a powdered tobacco raw material, wherein the deviation between the median particle size of the powdered tobacco raw material and the median particle size of the powdered inorganic filler is less than or equal to 20%. The deviation between the median particle size of the powdered tobacco raw material and the median particle size of the powdered inorganic filler is less than or equal to 20% means that when the median particle size of the powdered tobacco raw material is larger than the median particle size of the powdered inorganic filler, the difference between the median particle size of the powdered tobacco raw material and the median particle size of the powdered inorganic filler is used as the numerator, and the median particle size of the powdered inorganic filler is used as the denominator, and the deviation is less than or equal to 20%; or when the median particle size of the powdered inorganic filler is larger than the median particle size of the powdered tobacco raw material, the difference between the median particle size of the powdered inorganic filler and the median particle size of the powdered tobacco raw material is used as the numerator, and the median particle size of the powdered tobacco raw material is used as the denominator, and the deviation is less than or equal to 20%.

[0040] By controlling the particle sizes of powdered tobacco raw materials and powdered inorganic fillers, the problem of poor retention of powdered inorganic fillers by retention aids and nanocellulose due to the large difference in particle sizes of powdered tobacco raw materials and powdered inorganic fillers is avoided. The similarity in physical size of powdered tobacco raw materials and powdered inorganic fillers is also conducive to ensuring the stability of the powder during processing, which has a beneficial effect on the retention rate.

[0041] In order to improve the retention rate of the powdered inorganic filler, the particle size of the powdered tobacco raw material and the powdered inorganic filler in step (1) can be 100-160 meshes.

[0042] Furthermore, the particle size of the powdered tobacco raw material and the powdered inorganic filler may be 150-160 mesh.

[0043] Furthermore, in order to improve the retention rate of the powdered inorganic filler, the deviation between the median particle size of the powdered tobacco raw material and the median particle size of the powdered inorganic filler in step (1) is less than 15% and greater than 10%.

[0044] In specific implementation, the median particle size of the powdered inorganic filler can be controlled to be smaller than the median particle size of the powdered tobacco raw material to ensure the retention effect of the powdered inorganic filler.

[0045] Step (2): Mix the powdered tobacco raw material and the fiber raw material and perform extraction treatment to obtain an extract and a solid residue.

[0046] The fiber raw material in step (2) may be a coniferous and / or broadleaf wood pulp fiber pulp board, and the mass ratio of the powdered tobacco raw material to the fiber raw material may be 100:(10-15).

[0047] The extraction treatment in step (2) is a water extraction treatment, and the parameters of the water extraction treatment can be as follows: the mass ratio of the extract to water is 1:(7-10), the water temperature is 65°C-75°C, and the extraction time is 55min-65min.

[0048] Step (3): pulping the solid residue to obtain tobacco slurry.

[0049] The beating degree of the beating treatment in step (3) may be 55°SR-75°SR.

[0050] Step (4): adding nanocellulose to the guar gum aqueous solution to obtain a mixed gum solution.

[0051] The guar gum aqueous solution in step (4) can be prepared by the following method: adding cationic guar gum to water at a stirring speed of 800-1600 r / min and stirring for 5-10 minutes to obtain a guar gum aqueous solution with a mass concentration of 0.1-0.5%.

[0052] Step (4) can be specifically as follows:

[0053] Add nanocellulose to the guar gum aqueous solution at a stirring speed of 3200-3600 r / min and stir for 10-15 minutes to obtain a mixed glue solution, wherein the mass concentration of nanocellulose in the mixed glue solution is 0.1-1.0%.

[0054] Step (5): adding the mixed glue and powdered inorganic filler into the tobacco slurry to obtain a mixed slurry.

[0055] Step (6): forming the mixed slurry into a sheet and drying it to obtain the reconstituted tobacco leaf base.

[0056] The drying temperature in step (6) can be 90°C-120°C, the moisture content of the reconstituted tobacco leaf base is 15-25%, and the basis weight is 50-62g / m 2 .

[0057] In order to ensure the retention rate of the inorganic filler, the powdered inorganic filler is at least one of calcium carbonate and white carbon black, and the mass absolute dry ratio of the mixed glue, the powdered inorganic filler and the tobacco slurry is (0.5-1.5):(20-30):(70-80).

[0058] In addition, calcium carbonate and white carbon black are more conducive to reducing the tar and CO release of reconstituted tobacco leaves, thereby improving the smoking experience of reconstituted tobacco leaves.

[0059] The method for preparing reconstituted tobacco with high inorganic filler content of the present invention comprises the following steps:

[0060] The extract is coated on the reconstituted tobacco leaf base prepared by the method for preparing the reconstituted tobacco leaf base with high inorganic filler content of the present invention, and then dried to obtain the reconstituted tobacco leaf.

[0061] The high inorganic filler content reconstituted tobacco provided by the present invention is prepared by the preparation method of the high inorganic filler content reconstituted tobacco provided by the present invention, wherein the mass percentage of the powdered inorganic filler in the reconstituted tobacco leaf base is 15-25%. The content of the powdered inorganic filler in the reconstituted tobacco leaf base is significantly increased compared with the existing reconstituted tobacco products.

[0062] The experimental methods used in the following examples are all conventional methods unless otherwise specified. The materials and reagents used are all commercially available unless otherwise specified. The equipment used in the experiments are all well known to those skilled in the art unless otherwise specified.

[0063] Example 1

[0064] Take 100g of coniferous wood pulp fiber pulp board and soak it in water for 4h-8h, then deagglomerate it at a deagglomeration concentration of 15%, mix the deagglomerated wood pulp fiber pulp board with powdered tobacco raw material (median particle size of 150 mesh) at a mass ratio of 10:100, extract at a temperature of 70°C at a mass ratio of 1:8 between the extract and water, and perform solid-liquid separation after extraction for 60 minutes to obtain an extract and a solid residue.

[0065] The solid residue was pulped using a Wally pulper to obtain tobacco pulp with a beating degree of 60°SR.

[0066] The extract was concentrated by vacuum to a density of 1.280 g / cm 3 , to obtain a concentrated solution.

[0067] Take 0.1 g of guar gum powder and add it into 99.9 g of water, stir at 60°C and 1000 r / min for 10 min to obtain a guar gum aqueous solution.

[0068] 1 gram of nanocellulose was added to the above guar gum aqueous solution, and stirred at room temperature and 3600 r / min for 15 min to obtain a mixed gum solution.

[0069] 100 g of tobacco slurry and powdered calcium carbonate (median particle size of 160 mesh) were prepared in an absolute dry ratio of 80:20, and 101 g of mixed glue (containing 0.1 g of absolute dry guar gum and 1.0 g of absolute dry nanocellulose) were added to obtain a mixed slurry. The slurry was made using a dynamic sheeting machine at a 1% slurry concentration. The sheet base was dried at 90°C to a moisture content of 15%, and the sheet base was 50 g / m 2 .

[0070] Example 2

[0071] Take 100g of coniferous wood pulp fiber pulp board and soak it in water for 4h-8h, then deagglomerate it at a deagglomeration concentration of 15%, mix the deagglomerated wood pulp fiber pulp board with powdered tobacco raw material (median particle size is 100 mesh) at a mass ratio of 10:100, extract at a temperature of 70°C at a mass ratio of 1:8 between the extract and water, and perform solid-liquid separation after extraction for 60 minutes to obtain an extract and a solid residue.

[0072] The solid residue was pulped using a Wally pulper to obtain tobacco pulp with a beating degree of 60°SR.

[0073] The extract was concentrated by vacuum to a density of 1.280 g / cm 3 , to obtain a concentrated solution.

[0074] Take 0.1 g of guar gum powder and add it into 99.9 g of water, stir at 60°C and 1000 r / min for 10 min to obtain a guar gum aqueous solution.

[0075] 1 gram of nanocellulose was added to the above guar gum aqueous solution, and stirred at room temperature and 3600 r / min for 15 min to obtain a mixed gum solution.

[0076] 100 g of tobacco slurry and powdered calcium carbonate (median particle size of 115 mesh) were prepared in an absolute dry ratio of 80:20, and 101 g of mixed glue (containing 0.1 g of absolute dry guar gum and 1.0 g of absolute dry nanocellulose) were added to obtain a mixed slurry. The slurry was made using a dynamic sheeting machine at a 1% slurry concentration. The sheet base was dried at 90°C to a moisture content of 15% and a sheet base weight of 52 g / m 2 .

[0077] Example 3

[0078] Take 100g of coniferous wood pulp fiber pulp board and soak it in water for 4h-8h, then deagglomerate it at a deagglomeration concentration of 15%, mix the deagglomerated wood pulp fiber pulp board with powdered tobacco raw material (median particle size of 150 mesh) at a mass ratio of 10:100, extract at a temperature of 70°C at a mass ratio of 1:8 between the extract and water, and perform solid-liquid separation after extraction for 60 minutes to obtain an extract and a solid residue.

[0079] The solid residue was pulped using a Wally pulper to obtain tobacco pulp with a beating degree of 60°SR.

[0080] The extract was concentrated by vacuum to a density of 1.280 g / cm 3 , to obtain a concentrated solution.

[0081] Take 0.1 g of guar gum powder and add it into 99.9 g of water, stir at 60°C and 1000 r / min for 10 min to obtain a guar gum aqueous solution.

[0082] 1 gram of nanocellulose was added to the above guar gum aqueous solution, and stirred at room temperature and 3600 r / min for 15 min to obtain a mixed gum solution.

[0083] 100 g of tobacco slurry and powdered calcium carbonate (median particle size of 160 mesh) were prepared in a mass absolute dry ratio of 75:25, and 101 g of mixed glue (containing 0.1 g of absolute dry guar gum and 1.0 g of absolute dry nanocellulose) were added to obtain a mixed slurry. The slurry was sheeted using a dynamic sheeting machine at a 1% slurry concentration. The sheet base was dried at 90°C to a moisture content of 15% and a sheet base weight of 55 g / m 2 .

[0084] Example 4

[0085] Take 100g of coniferous wood pulp fiber pulp board and soak it in water for 4h-8h, then deagglomerate it at a deagglomeration concentration of 15%, mix the deagglomerated wood pulp fiber pulp board with powdered tobacco raw material (median particle size of 150 mesh) at a mass ratio of 10:100, extract at a temperature of 70°C at a mass ratio of 1:8 between the extract and water, and perform solid-liquid separation after extraction for 60 minutes to obtain an extract and a solid residue.

[0086] The solid residue was pulped using a Wally pulper to obtain tobacco pulp with a beating degree of 60°SR.

[0087] The extract was concentrated by vacuum to a density of 1.280 g / cm 3 , to obtain a concentrated solution.

[0088] Take 0.1 g of guar gum powder and add it into 99.9 g of water, stir at 60°C and 1000 r / min for 10 min to obtain a guar gum aqueous solution.

[0089] 1 gram of nanocellulose was added to the above guar gum aqueous solution, and stirred at room temperature and 3600 r / min for 15 min to obtain a mixed gum solution.

[0090] 100 g of tobacco pulp and powdered calcium carbonate (median particle size of 160 mesh) were prepared at a mass absolute dry ratio of 70:30, and 101 g of mixed glue (containing 0.1 g of absolute dry guar gum and 1.0 g of absolute dry nanocellulose) were added to obtain a mixed slurry. The slurry was sheeted using a dynamic sheeting machine at a 1% slurry concentration. The sheet base was dried at 90°C to a moisture content of 15%, and the sheet base was 53 g / m 2 .

[0091] Comparative Example 1

[0092] Take 100g of coniferous wood pulp fiber pulp board and soak it in water for 4h-8h, then deagglomerate it at a deagglomeration concentration of 15%, mix the deagglomerated wood pulp fiber pulp board with powdered tobacco raw material (median particle size of 150 mesh) at a mass ratio of 10:100, extract at a temperature of 70°C at a mass ratio of 1:8 between the extract and water, and perform solid-liquid separation after extraction for 60 minutes to obtain an extract and a solid residue.

[0093] The solid residue was pulped using a Wally pulper to obtain tobacco pulp with a beating degree of 60°SR.

[0094] The extract was concentrated by vacuum to a density of 1.280 g / cm 3 , to obtain a concentrated solution.

[0095] Take 0.1 g of guar gum powder and add it into 99.9 g of water, stir at 60°C and 1000 r / min for 10 min to obtain a guar gum aqueous solution.

[0096] 100 g of tobacco slurry and powdered calcium carbonate (median particle size of 160 mesh) were prepared in an absolute dry ratio of 80:20, and 100 g of guar gum aqueous solution (containing 0.1 g of absolute dry guar gum) was added to obtain a mixed slurry. The slurry was sheeted using a dynamic sheeting machine at a 1% slurry concentration. The sheet base was dried at 90°C to a moisture content of 15% and a sheet base weight of 55 g / m 2 .

[0097] Comparative Example 2

[0098] Take 100g of coniferous wood pulp fiber pulp board and soak it in water for 4h-8h, then deagglomerate it at a deagglomeration concentration of 15%, mix the deagglomerated wood pulp fiber pulp board with tobacco raw material (tobacco waste with a particle size range of 50-100 mesh and a median particle size of 80 mesh) at a mass ratio of 10:100, extract at a temperature of 70°C with a mass ratio of extract to water of 1:8, extract for 60 minutes, perform solid-liquid separation, and obtain an extract and a solid residue.

[0099] The solid residue was pulped using a Wally pulper to obtain tobacco pulp with a beating degree of 60°SR.

[0100] The extract was concentrated by vacuum to a density of 1.280 g / cm 3 , to obtain a concentrated solution.

[0101] Take 0.1 g of guar gum powder and add it into 99.9 g of water, stir at 60°C and 1000 r / min for 10 min to obtain a guar gum aqueous solution.

[0102] 1 gram of nanocellulose was added to the above guar gum aqueous solution, and stirred at room temperature and 3600 r / min for 15 min to obtain a mixed gum solution.

[0103] 100 g of tobacco slurry and powdered calcium carbonate (particle size range 100-120 mesh, median particle size 115 mesh) were prepared in an absolute dry ratio of 80:20, and 101 g of mixed glue (containing 0.1 g absolute dry guar gum and 1.0 g absolute dry nanocellulose) were added to obtain a mixed slurry. The slurry was made by a dynamic sheeting machine at a 1% slurry concentration. The sheet base was dried at 90°C to a moisture content of 15%, and the sheet base was 60 g / m 2 .

[0104] The inorganic filler content of the reconstituted tobacco leaf base obtained in the above examples and comparative examples was tested, and the results are shown in Table 1.

[0105] Table 1 Calcium carbonate content in reconstituted tobacco leaf base

[0106]

[0107] The coating liquid was coated on the reconstituted tobacco leaf base prepared in the above-mentioned Example 1, Example 3, Example 4 and Comparative Example 1 at a coating rate of 40%, and dried at 80°C with a moisture content of 12% to prepare a 100±10 g / m 2 The reconstituted tobacco leaves were cut into shreds and rolled into cigarettes, and the smoke components were measured as shown in Table 2.

[0108] Table 2 Smoke indexes of reconstituted tobacco leaves with different calcium carbonate contents

[0109]

[0110] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A method for preparing reconstituted tobacco leaf base with high inorganic filler content, characterized in that: The steps include: Step (1): pulverizing the tobacco raw material to obtain a powdered tobacco raw material, wherein the deviation between the median particle size of the powdered tobacco raw material and the median particle size of the powdered inorganic filler is less than or equal to 20%; Step (2): mixing the powdered tobacco raw material and the fiber raw material and performing an extraction process to obtain an extract and a solid residue; Step (3): pulping the solid residue to obtain tobacco pulp; Step (4): adding nanocellulose to the guar gum aqueous solution to obtain a mixed gum solution; Step (5): adding the mixed glue and the powdered inorganic filler into the tobacco slurry to obtain a mixed slurry; Step (6): forming the mixed slurry into a sheet and drying it to obtain the reconstituted tobacco leaf base.

2. The method for preparing reconstituted tobacco leaf base with high inorganic filler content according to claim 1, characterized in that: The particle sizes of the powdered tobacco raw material and the powdered inorganic filler in step (1) are both 100-160 meshes.

3. The method for preparing reconstituted tobacco leaf base with high inorganic filler content according to claim 2, characterized in that: The deviation between the median particle size of the powdered tobacco raw material and the median particle size of the powdered inorganic filler in step (1) is less than 15% and greater than 10%.

4. The method for preparing reconstituted tobacco leaf base with high inorganic filler content according to claim 1, characterized in that: The fiber raw material in step (2) is a coniferous and / or hardwood pulp fiber pulp board, and the mass ratio of the powdered tobacco raw material to the fiber raw material is 100:(10-15); The extraction treatment in step (2) is a water extraction treatment, and the parameters of the water extraction treatment are as follows: the mass ratio of the extract to water is 1:(7-10), the water temperature is 65°C-75°C, and the extraction time is 55min-65min.

5. The method for preparing reconstituted tobacco leaf base with high inorganic filler content according to claim 1, characterized in that: The beating degree of the beating treatment in the step (3) is 55°SR-75°SR.

6. The method for preparing reconstituted tobacco leaf base with high inorganic filler content according to claim 1, characterized in that: The guar gum aqueous solution in step (4) is prepared by the following method: adding cationic guar gum to water at a stirring speed of 800-1600 r / min and stirring for 5-10 minutes to obtain a guar gum aqueous solution with a mass concentration of 0.1-0.5%; The step (4) is specifically as follows: Add nanocellulose to the guar gum aqueous solution at a stirring speed of 3200-3600 r / min and stir for 10-15 minutes to obtain a mixed glue solution, wherein the mass concentration of nanocellulose in the mixed glue solution is 0.1-1.0%.

7. The method for preparing reconstituted tobacco leaf base with high inorganic filler content according to claim 1, characterized in that: The drying temperature in step (6) is 90°C-120°C, the moisture content of the reconstituted tobacco leaf base is 15-25%, and the basis weight is 50-62g / m 2 .

8. The method for preparing reconstituted tobacco leaf base with high inorganic filler content according to any one of claims 1 to 7, characterized in that: The powdered inorganic filler is at least one of calcium carbonate and white carbon black, and the absolute dry weight ratio of the mixed glue, the powdered inorganic filler and the tobacco slurry is (0.5-1.5):(20-30):(70-80).

9. A method for preparing reconstituted tobacco with high inorganic filler content, characterized in that: The steps include: The extract is applied to the reconstituted tobacco leaf base prepared by the method for preparing a reconstituted tobacco leaf base with a high inorganic filler content according to any one of claims 1 to 8, and then dried to obtain the reconstituted tobacco leaf.

10. A reconstituted tobacco leaf with a high inorganic filler content, characterized in that: The method for preparing reconstituted tobacco with high inorganic filler content according to claim 9, wherein the mass percentage of the powdered inorganic filler in the reconstituted tobacco leaf base is 15-25%.

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