Fiveleaf gynostemma herb pulp containing fiveleaf gynostemma herb rhizomes and preparation method and application of tobacco sheet

Abstract

The invention discloses a fiveleaf gynostemma herb pulp containing fiveleaf gynostemma herb rhizome, a preparation method and application of a tobacco sheet and a preparation method of the fiveleaf gynostemma herb pulp containing the fiveleaf gynostemma herb rhizome, the fiveleaf gynostemma herb rhizome is adopted as a raw material, the fiveleaf gynostemma herb rhizome is independently treated, and the prepared fiveleaf gynostemma herb pulp can be used as a material of the tobacco sheet. The preparation method of the tobacco sheet containing the fiveleaf gynostemma herb rhizome comprises the steps of fiveleaf gynostemma herb slurry preparation, coating liquid preparation and tobacco-fiveleaf gynostemma herb sheet preparation, the tobacco sheet prepared through the method adopts the fiveleaf gynostemma herb rhizome as a raw material, the smoking taste can be improved, and the tensile strength of the tobacco sheet can also be improved. The tobacco sheet containing the fiveleaf gynostemma herb rhizome can be applied to outer wrapping of cigars or applied to cigarettes.

Description

Technical Field

[0001] The invention relates to the preparation and application fields of tobacco sheets, and in particular to a preparation method and application of a gynostemma pentaphyllum slurry containing gynostemma pentaphyllum rhizomes and tobacco sheets. Background Art

[0002] In order to reduce harmful components in cigarette smoke, reduce raw material consumption in the tobacco industry, and improve the taste of cigarette products, the cigarette manufacturing industry mainly uses paper-made tobacco flakes as fillers and adds them to shredded tobacco to improve the quality of cigarettes.

[0003] In addition to tobacco leaf fragments, tobacco dust, and tobacco stems, tobacco flakes often contain other herbal ingredients. Gynostemma pentaphyllum, a natural plant flavoring, is also used in tobacco flakes.

[0004] Patent document with publication number CN101606749A discloses tar-reduced and harm-reduced reconstituted tobacco leaves, which reduces the content of tar and free radicals in smoke by adding Gynostemma pentaphyllum, Polygonum multiflorum, and Hedyotis diffusa to improve the smoking experience, increase the safety of cigarettes, and reduce the incidence of respiratory diseases.

[0005] The technology disclosed in CN101606749A has the following shortcomings:

[0006] 1. The Gynostemma pentaphyllum described therein is not the rhizome of Gynostemma pentaphyllum, which has a cost problem.

[0007] 2. The Gynostemma pentaphyllum described therein is only one component in the compound.

[0008] 3. The processing methods of Gynostemma pentaphyllum include roller pressing method and thick slurry method, which is just simple crushing.

[0009] 4. Among the methods for manufacturing reconstituted tobacco leaves, both the roller pressing method and the thick pulp method require the use of adhesives, which have a significant impact on the quality of reconstituted tobacco leaves. These two methods are outdated methods that have been eliminated.

[0010] Patent document CN105614940A discloses the preparation of gynostemma pentaphyllum slices for tobacco and a method for preparing cigarettes using the gynostemma pentaphyllum slices. Gynostemma pentaphyllum is added during the preparation of tobacco slices, wherein gynostemma pentaphyllum refers to gynostemma pentaphyllum leaves and stems. The prepared tobacco slices have the medicinal aroma of gynostemma pentaphyllum, which can achieve a coordination between the medicinal aroma and the tobacco aroma.

[0011] The technology disclosed in CN105614940A has the following shortcomings:

[0012] 1. The Gynostemma pentaphyllum described therein is not the rhizome of Gynostemma pentaphyllum, but the whole herb of Gynostemma pentaphyllum, which is relatively expensive.

[0013] 2. The roller pressing method is used to produce reconstituted tobacco leaves, which requires the use of adhesives and has a significant impact on the quality of the reconstituted tobacco leaves. It is an outdated method that should be eliminated.

[0014] However, there is currently no technology that uses Gynostemma pentaphyllum rhizomes as raw materials, processes them separately, and then applies them to tobacco sheets to improve the smoking quality of the tobacco sheets while also taking into account the physical strength properties. Summary of the Invention

[0015] One of the purposes of the present invention is to provide a method for preparing a gynostemma pentaphyllum slurry containing gynostemma pentaphyllum rhizomes, using gynostemma pentaphyllum rhizomes as raw materials, and processing the gynostemma pentaphyllum rhizomes separately. The prepared gynostemma pentaphyllum slurry can be used as a material for tobacco sheets.

[0016] The above-mentioned object of the present invention is achieved by the following technical solution: a method for preparing a Gynostemma pentaphyllum slurry containing Gynostemma pentaphyllum rhizomes, characterized in that the method comprises the following steps:

[0017] Step (1), air-drying the rhizome of Gynostemma pentaphyllum to a dryness ratio of 85% to 95%;

[0018] Step (2), cutting the air-dried Gynostemma pentaphyllum rhizomes into segments with a grass cutter, wherein the length of the segments after cutting is 3 to 20 cm;

[0019] Step (3), the cut Gynostemma pentaphyllum rhizome is mixed with 50% to 80% ethanol aqueous solution in a ratio of 1:8 to 15 by volume based on the absolute dry weight, and after mixing, the mixture is heated and extracted at a temperature of 60° C. to 80° C. for 1 to 2 times, each extraction time being 20 to 60 minutes;

[0020] Step (4), removing the gynostemma pentaphyllum rhizome from the solvent, placing it on a grid for 30 minutes, draining the gynostemma pentaphyllum rhizome, and mixing it with a 1% to 5% sodium hydroxide aqueous solution at a material-liquid mass ratio of 1:8 to 15 based on the absolute dry weight, and after mixing, heating and extracting it at a temperature of 80° C. to 100° C. for 1 to 2 times, each extraction time being 20 to 60 minutes;

[0021] Step (5), removing the gynostemma pentaphyllum rhizome from the solvent, placing it on a grid for 30 minutes, draining the gynostemma pentaphyllum rhizome, and mixing it with water at a material-liquid mass ratio of 1:8 to 15 for 30 minutes based on the absolute dry weight, then removing the gynostemma pentaphyllum rhizome from the water, placing it on a grid for 30 minutes, and draining the water; this step is repeated 3 times to remove the residual sodium hydroxide in the gynostemma pentaphyllum rhizome;

[0022] Step (6), tearing the drained Gynostemma pentaphyllum rhizome through a wire splitting machine to produce filamentous fibers with a diameter of 0.2-2 mm;

[0023] Step (7): The obtained Gynostemma pentaphyllum filamentous fibers are prepared into Gynostemma pentaphyllum slurry by a conventional pulping process, wherein the beating degree of the Gynostemma pentaphyllum slurry is 55±2°SR.

[0024] The present invention discloses a method for preparing a gynostemma pentaphyllum slurry, which uses gynostemma pentaphyllum rhizomes as raw materials and processes the rhizomes separately. This method not only effectively removes the green smell of the rhizomes, but also effectively retains the fibers in the rhizomes, thereby increasing the strength of tobacco sheets and improving the yield of tobacco sheets. Furthermore, the gynostemma pentaphyllum slurry obtained by this treatment method is subsequently used in the manufacture of tobacco sheets, and can incorporate the unique aroma and medicinal effects of the rhizomes into cigarettes, thereby enhancing the smoking flavor of cigarettes while also improving the quality of the cigarettes and minimizing the harm of cigarettes to human health.

[0025] The second object of the present invention is to provide a method for preparing tobacco sheets containing Gynostemma pentaphyllum rhizomes. The tobacco sheets prepared by this method use Gynostemma pentaphyllum rhizomes as raw materials, and the Gynostemma pentaphyllum rhizomes are processed separately, which can not only improve the smoking taste, but also improve the tensile strength of the tobacco sheets.

[0026] The above-mentioned object of the present invention is achieved by the following technical solution: a method for preparing tobacco sheets containing Gynostemma pentaphyllum rhizomes, characterized in that the method comprises preparing Gynostemma pentaphyllum slurry, preparing a coating liquid and preparing tobacco-Gynostemma pentaphyllum sheets,

[0027] The preparation of the Gynostemma pentaphyllum slurry comprises the following steps:

[0028] Step (1), air-drying the rhizome of Gynostemma pentaphyllum to a dryness ratio of 85% to 95%;

[0029] Step (2), cutting the air-dried Gynostemma pentaphyllum rhizomes into segments with a grass cutter, wherein the length of the segments after cutting is 3 to 20 cm;

[0030] Step (3), the cut Gynostemma pentaphyllum rhizome is mixed with 50% to 80% ethanol aqueous solution in a ratio of 1:8 to 15 by volume based on the absolute dry weight, and after mixing, the mixture is heated and extracted at a temperature of 60° C. to 80° C. for 1 to 2 times, each extraction time being 20 to 60 minutes;

[0031] Step (4), removing the gynostemma pentaphyllum rhizome from the solvent, placing it on a grid for 30 minutes, draining the gynostemma pentaphyllum rhizome, and mixing it with a 1% to 5% sodium hydroxide aqueous solution at a material-liquid mass ratio of 1:8 to 15 based on the absolute dry weight, and after mixing, heating and extracting it at a temperature of 80° C. to 100° C. for 1 to 2 times, each extraction time being 20 to 60 minutes;

[0032] Step (5), removing the gynostemma pentaphyllum rhizome from the solvent, placing it on a grid for 30 minutes, draining the gynostemma pentaphyllum rhizome, and mixing it with water at a material-liquid mass ratio of 1:8 to 15 for 30 minutes based on the absolute dry weight, then removing the gynostemma pentaphyllum rhizome from the water, placing it on a grid for 30 minutes, and draining the water; this step is repeated 3 times to remove the residual sodium hydroxide in the gynostemma pentaphyllum rhizome;

[0033] Step (6), tearing the drained Gynostemma pentaphyllum rhizome through a wire splitting machine to produce filamentous fibers with a diameter of 0.2-2 mm;

[0034] Step (7), preparing the obtained Gynostemma pentaphyllum filamentous fibers into Gynostemma pentaphyllum slurry by a conventional refining process, wherein the beating degree of the Gynostemma pentaphyllum slurry is 55±2°SR;

[0035] The coating solution preparation comprises the following steps:

[0036] Step (8), weighing a certain mass of tobacco stems, calculating the absolute dry weight, adding water at a material-liquid mass ratio of 1:3 to 7, mixing, heating and extracting at a temperature of 65±5° C. for 40 minutes, then performing solid-liquid separation to obtain extracted tobacco stems and an extract, and then performing reduced pressure distillation on the extract at a pressure of 0.02±0.01 MPa, and distilling and concentrating to a solid content of 40±2%, thereby obtaining a tobacco stem concentrate;

[0037] Step (9), weighing a certain mass of tobacco dust, calculating the absolute dry weight, adding water at a material-liquid mass ratio of 1:3 to 7, mixing, heating and extracting at a temperature of 65±5° C. for 40 minutes, then performing solid-liquid separation to obtain extracted tobacco dust and an extract, and then performing reduced pressure distillation on the extract at a pressure of 0.02±0.01 MPa, and distilling and concentrating to a solid content of 40±2%, thereby obtaining a tobacco dust concentrate;

[0038] Step (10), mixing the obtained tobacco stem concentrate and tobacco dust concentrate in a mass ratio of 1:3 to 5:1 to obtain a mixed coating liquid;

[0039] The preparation of the tobacco-Gynostemma pentaphyllum slice comprises the following steps:

[0040] Step (11), grinding the extracted tobacco stems to a beating degree of 15±2°SR by a disk grinder, and then mixing and grinding with the extracted tobacco dust at a mass ratio of tobacco stems to tobacco dust absolute dry pulp of 1:1-1.5 to a beating degree of 20±2°SR, to obtain tobacco slurry;

[0041] Step (12), mixing the gynostemma pentaphyllum slurry and the tobacco slurry at a ratio of 1:4 to 8 in terms of absolute dry pulp mass, and then preparing primary sheets according to a conventional papermaking method;

[0042] Step (13): coating the mixed coating liquid on both sides of the primary sheet, drying the sheet after coating, controlling the coating rate to be 30% to 45%, and drying the sheet to a water content of 14% to 22% by mass, thereby obtaining tobacco sheets containing Gynostemma pentaphyllum rhizomes.

[0043] The preparation method of the present invention uses the rhizome of Gynostemma pentaphyllum as the raw material instead of the general Gynostemma pentaphyllum leaf, which can improve the quality of the tobacco sheet in terms of aroma and flavor, and also improve the tensile strength of the tobacco sheet.

[0044] In steps (8) and (9) of the present invention, the temperature is 65±5°C, 65°C is a heating parameter, 5°C is a tolerance, the pressure value is 0.02±0.01MPa, 0.02MPa is a pressure parameter, 0.01MPa is a tolerance, and the solid content is 40±2%, 40% is a percentage parameter, and 2 is a tolerance.

[0045] The tobacco sheet preparation method of the present invention requires that the Gynostemma pentaphyllum rhizome be processed separately, rather than being mixed with it as a compound ingredient in cigarettes. This unique processing method not only effectively removes the green odor of the Gynostemma pentaphyllum rhizome, but also effectively retains the fibers in the Gynostemma pentaphyllum rhizome, thereby increasing the strength of the tobacco sheet and improving the yield of the tobacco sheet. Furthermore, this processing method incorporates the unique aroma and medicinal benefits of the Gynostemma pentaphyllum rhizome into the cigarette, enhancing the smoking experience while also improving the quality of the cigarette and minimizing the harm of cigarettes to human health.

[0046] The invention adopts the rhizome of Gynostemma pentaphyllum as the cigarette raw material, which has a huge cost advantage compared with the use of Gynostemma pentaphyllum leaves.

[0047] In the present invention, the specific process of preparing the primary sheet by conventional papermaking method is: flow conveying - wire forming - pressing - sheet base drying. The sheet base thickness is controlled to be 0.15-0.2mm.

[0048] By using the tobacco sheet containing the rhizomes of Gynostemma pentaphyllum obtained by the above process, the whole tobacco sheet can be used as the outer wrapper of cigars.

[0049] The tobacco sheets containing Gynostemma pentaphyllum rhizomes obtained by the above process are used in cigarettes. The tobacco sheets are cut into shreds using conventional means using a shredder. The size and standard of the shredded tobacco are the same as those of conventional shredded tobacco. The obtained tobacco shreds account for 2% to 50% of the mass of the entire cigarette shredded tobacco, calculated on an absolute dry weight basis.

[0050] Compared to existing technologies, the tobacco sheet of the present invention partially replaces traditional added non-tobacco fibers with Gynostemma pentaphyllum rhizome fibers, demonstrating feasibility in practical production. Tobacco sheets containing Gynostemma pentaphyllum rhizome fibers can enhance the flavor of cigarettes. Adding the prepared tobacco sheet to cigarettes to replace some shredded tobacco provides aroma and improves cigarette quality. Compared to traditional tobacco sheet, tobacco sheet containing Gynostemma pentaphyllum rhizome fibers exhibits reduced woody and pungent aromas, resulting in less irritation and improved flavor. DETAILED DESCRIPTION

[0051] Example 1

[0052] A method for preparing tobacco sheets containing Gynostemma pentaphyllum rhizomes, comprising preparing Gynostemma pentaphyllum slurry, preparing a coating liquid, and preparing tobacco-Gynostemma pentaphyllum sheets, wherein:

[0053] The preparation of Gynostemma pentaphyllum slurry comprises the following steps:

[0054] Step (1), air-drying the rhizome of Gynostemma pentaphyllum until the absolute dryness is 85%;

[0055] Step (2), cutting the air-dried Gynostemma pentaphyllum rhizomes into segments with a grass cutter, wherein the length of the segments after cutting varies from 3 to 20 cm;

[0056] Step (3), the cut Gynostemma pentaphyllum rhizome is mixed with an 80% ethanol aqueous solution by volume in a material-liquid mass ratio of 1:8 based on the absolute dry weight, and after mixing, heated and extracted twice at a temperature of 60° C., each extraction time being 20 minutes;

[0057] Step (4), removing the gynostemma pentaphyllum rhizome from the solvent, placing it on a grid for 30 minutes, draining the gynostemma pentaphyllum rhizome, and mixing it with a 5% by mass sodium hydroxide aqueous solution at a material-liquid mass ratio of 1:8 based on the absolute dry weight, and heating and extracting it at 80° C. for 1 time, each extraction time being 60 minutes;

[0058] Step (5), removing the gynostemma pentaphyllum rhizome from the solvent, placing it on a grid for 30 minutes, draining the gynostemma pentaphyllum rhizome, and mixing it with water at a material-liquid mass ratio of 1:15 for 30 minutes based on the absolute dry weight, then removing the gynostemma pentaphyllum rhizome from the water, placing it on a grid for 30 minutes, and draining the water; this step is repeated 3 times to remove the residual sodium hydroxide in the gynostemma pentaphyllum rhizome;

[0059] Step (6), the drained Gynostemma pentaphyllum rhizome is torn into filamentous fibers with a diameter of 0.2-2 mm by a wire splitting machine;

[0060] Step (7), preparing the obtained Gynostemma pentaphyllum filamentous fibers into Gynostemma pentaphyllum slurry by a conventional refining process, wherein the beating degree of the Gynostemma pentaphyllum slurry is 55±2°SR;

[0061] The coating solution preparation includes the following steps:

[0062] Step (8), weighing a certain mass of tobacco stems, calculating the absolute dry weight, adding water at a material-liquid mass ratio of 1:3, mixing, heating and extracting at a temperature of 65±5° C. for 40 minutes, then performing solid-liquid separation to obtain extracted tobacco stems and an extract, and then performing reduced pressure distillation at 0.02±0.01 MPa to concentrate the extract to a solid content of 40±2%, thereby obtaining a tobacco stem concentrate;

[0063] Step (9), weighing a certain mass of tobacco dust, calculating the absolute dry weight, adding water at a material-liquid mass ratio of 1:3, mixing, heating and extracting at a temperature of 65±5° C. for 40 minutes, then performing solid-liquid separation to obtain extracted tobacco dust and an extract, and then performing reduced pressure distillation on the extract at 0.02±0.01 MPa, distilling and concentrating to a solid content of 40±2%, to obtain a tobacco dust concentrate;

[0064] Step (10), mixing the obtained tobacco stem concentrate and tobacco dust concentrate in a mass ratio of 1:3 to obtain a mixed coating liquid;

[0065] The preparation of tobacco-Gynostemma pentaphyllum slices comprises the following steps:

[0066] Step (11), grinding the extracted tobacco stems to a beating degree of 15±2°SR by a disc grinder, and then mixing and grinding with the extracted tobacco dust at a mass ratio of tobacco stems to tobacco dust absolute dry pulp of 1:1 to a beating degree of 20±2°SR, to obtain tobacco slurry;

[0067] Step (12), mixing the gynostemma pentaphyllum slurry and the tobacco slurry at a ratio of 1:4 in terms of absolute dry pulp mass, and then preparing a primary sheet according to a conventional papermaking method;

[0068] The conventional papermaking process for preparing primary sheets is as follows: flow conveying - wire forming - pressing - sheet base drying. The sheet base thickness is controlled at 0.15-0.2mm.

[0069] Step (13), coating the mixed coating liquid on both sides of the primary sheet, drying after coating, controlling the coating rate to 30%, and drying to a mass percentage of water content of 14%, thereby obtaining tobacco sheets containing Gynostemma pentaphyllum rhizomes.

[0070] By using the tobacco sheet containing the rhizomes of Gynostemma pentaphyllum obtained by the above process, the whole tobacco sheet can be used as the outer wrapper of cigars.

[0071] The tobacco sheets containing Gynostemma pentaphyllum rhizomes obtained by the above process are used in cigarettes. The tobacco sheets are cut into shreds using conventional means using a shredder. The shreds are sized and standardized to the same standards as conventional shredded tobacco, resulting in shredded tobacco sheets. Calculated on an absolute dry weight basis, the shredded tobacco sheets account for 20% of the total shredded tobacco in the cigarette. The shredded tobacco sheets can also range from 2% to 50%.

[0072] The following embodiments of the present invention are similar to those of Example 1. The entire tobacco sheet can be used as a cigar wrapper or as tobacco shreds for cigarettes. When used as tobacco shreds for cigarettes, the tobacco shreds can comprise 2% to 50% of the total tobacco shreds, calculated on an absolute dry weight basis, for example, 5%, 8%, 10%, 20%, 30%, or 40%.

[0073] Example 2

[0074] A method for preparing tobacco sheets containing Gynostemma pentaphyllum rhizomes, comprising preparing Gynostemma pentaphyllum slurry, preparing a coating liquid, and preparing tobacco-Gynostemma pentaphyllum sheets, wherein:

[0075] The preparation of Gynostemma pentaphyllum slurry comprises the following steps:

[0076] Step (1), air-drying the rhizome of Gynostemma pentaphyllum to a dryness rate of 95%;

[0077] Step (2), cutting the air-dried Gynostemma pentaphyllum rhizome into segments, wherein the length of the segments after cutting varies from 3 to 20 cm;

[0078] Step (3), the cut Gynostemma pentaphyllum rhizome is mixed with a 50% by volume ethanol aqueous solution at a material-liquid mass ratio of 1:15 based on the absolute dry weight, and after mixing, heated and extracted once at 80° C., each extraction time being 60 minutes;

[0079] Step (4), removing the gynostemma pentaphyllum rhizome from the solvent, placing it on a grid for 30 minutes, draining the gynostemma pentaphyllum rhizome, and mixing it with a 1% by mass sodium hydroxide aqueous solution at a material-liquid mass ratio of 1:15 based on the absolute dry weight, and heating and extracting it at 100° C. for 2 times, each extraction time being 20 minutes;

[0080] Step (5), removing the gynostemma pentaphyllum rhizome from the solvent, placing it on a grid for 30 minutes, draining the gynostemma pentaphyllum rhizome, and mixing it with water at a material-liquid mass ratio of 1:8 for 30 minutes based on the absolute dry weight, then removing the gynostemma pentaphyllum rhizome from the water, placing it on a grid for 30 minutes, and draining the water; this step is repeated 3 times to remove the residual sodium hydroxide in the gynostemma pentaphyllum rhizome;

[0081] Step (6), tearing the drained Gynostemma pentaphyllum rhizome through a wire splitting machine to produce filamentous fibers with a diameter of 0.2-2 mm;

[0082] Step (7), preparing the obtained Gynostemma pentaphyllum filamentous fibers into Gynostemma pentaphyllum slurry by a conventional refining process, wherein the beating degree of the Gynostemma pentaphyllum slurry is 55±2°SR;

[0083] The coating solution preparation includes the following steps:

[0084] Step (8), weighing a certain mass of tobacco stems, calculating the absolute dry weight, adding water at a material-liquid mass ratio of 1:7, mixing, heating and extracting at a temperature of 65±5° C. for 40 minutes, then performing solid-liquid separation to obtain extracted tobacco stems and an extract, and then performing reduced pressure distillation at 0.02±0.01 MPa to concentrate the extract to a solid content of 40±2%, thereby obtaining a tobacco stem concentrate;

[0085] Step (9), weighing a certain mass of tobacco dust, calculating the absolute dry weight, adding water at a material-liquid mass ratio of 1:7, mixing, heating and extracting at a temperature of 65±5° C. for 40 minutes, then performing solid-liquid separation to obtain extracted tobacco dust and an extract, and then performing reduced pressure distillation on the extract at 0.02±0.01 MPa, distilling and concentrating to a solid content of 40±2%, to obtain a tobacco dust concentrate;

[0086] Step (10), mixing the obtained tobacco stem concentrate and tobacco dust concentrate in a mass ratio of 5:1 to obtain a mixed coating liquid;

[0087] The preparation of tobacco-Gynostemma pentaphyllum slices comprises the following steps:

[0088] Step (11), grinding the extracted tobacco stems to a beating degree of 15±2°SR by a disk grinder, and then mixing and grinding with the extracted tobacco dust at a mass ratio of tobacco stems to tobacco dust absolute dry pulp of 1:1.5 to a beating degree of 20±2°SR, to obtain tobacco slurry;

[0089] Step (12), mixing the gynostemma pentaphyllum slurry and the tobacco slurry at a ratio of 1:8 in terms of absolute dry pulp mass, and then preparing a primary sheet according to a conventional papermaking method;

[0090] The specific process of preparing primary sheets by conventional papermaking is: flow conveying - wire forming - pressing - sheet base drying. The sheet base thickness is controlled at 0.15-0.2mm.

[0091] Step (13), coating the mixed coating liquid on both sides of the primary sheet, drying after coating, controlling the coating rate to 45%, and drying to a mass percentage of water content of 22%, thereby obtaining tobacco sheets containing Gynostemma pentaphyllum rhizomes.

[0092] Example 3

[0093] A method for preparing tobacco sheets containing Gynostemma pentaphyllum rhizomes, comprising preparing Gynostemma pentaphyllum slurry, preparing a coating liquid, and preparing tobacco-Gynostemma pentaphyllum sheets, wherein:

[0094] The preparation of Gynostemma pentaphyllum slurry comprises the following steps:

[0095] Step (1), air-drying the rhizome of Gynostemma pentaphyllum to a dryness rate of 88%;

[0096] Step (2), cutting the air-dried Gynostemma pentaphyllum rhizome into segments, wherein the length of the segments after cutting varies from 3 to 20 cm;

[0097] Step (3), the cut Gynostemma pentaphyllum rhizome is mixed with a 60% ethanol aqueous solution by volume in a material-liquid mass ratio of 1:10, and after mixing, heated and extracted once at a temperature of 79° C., each extraction time being 60 minutes;

[0098] Step (4), removing the gynostemma pentaphyllum rhizome from the solvent, placing it on a grid for 30 minutes, draining the gynostemma pentaphyllum rhizome, and mixing it with a 4% by mass sodium hydroxide aqueous solution at a material-liquid mass ratio of 1:10 based on the absolute dry weight, and heating and extracting it at 85° C. for 2 times, each extraction time being 20 minutes;

[0099] Step (5), removing the gynostemma pentaphyllum rhizome from the solvent, placing it on a grid for 30 minutes, draining the gynostemma pentaphyllum rhizome, and mixing it with water at a material-liquid mass ratio of 1:10 for 30 minutes based on the absolute dry weight, then removing the gynostemma pentaphyllum rhizome from the water, placing it on a grid for 30 minutes, and draining the water; this step is repeated 3 times to remove the residual sodium hydroxide in the gynostemma pentaphyllum rhizome;

[0100] Step (6), tearing the drained Gynostemma pentaphyllum rhizome through a wire splitting machine to produce filamentous fibers with a diameter of 0.2-2 mm;

[0101] Step (7), preparing the obtained Gynostemma pentaphyllum filamentous fibers into Gynostemma pentaphyllum slurry by a conventional refining process, wherein the beating degree of the Gynostemma pentaphyllum slurry is 55±2°SR;

[0102] The coating solution preparation includes the following steps:

[0103] Step (8), weighing a certain mass of tobacco stems, calculating the absolute dry weight, adding water at a material-liquid mass ratio of 1:4, mixing, heating and extracting at a temperature of 65±5° C. for 40 minutes, then performing solid-liquid separation to obtain extracted tobacco stems and an extract, and then performing reduced pressure distillation at 0.02±0.01 MPa to concentrate the extract to a solid content of 40±2%, thereby obtaining a tobacco stem concentrate;

[0104] Step (9), weighing a certain mass of tobacco dust, calculating the absolute dry weight, adding water at a material-liquid mass ratio of 1:4, mixing, heating and extracting at a temperature of 65±5° C. for 40 minutes, then performing solid-liquid separation to obtain extracted tobacco dust and an extract, and then performing reduced pressure distillation on the extract at 0.02±0.01 MPa, and distilling and concentrating to a solid content of 40±2%, to obtain a tobacco dust concentrate;

[0105] Step (10), mixing the obtained tobacco stem concentrate and tobacco dust concentrate in a mass ratio of 3:2 to obtain a mixed coating liquid;

[0106] The preparation of tobacco-Gynostemma pentaphyllum slices comprises the following steps:

[0107] Step (11), grinding the extracted tobacco stems to a beating degree of 15±2°SR by a disk grinder, and then mixing and grinding with the extracted tobacco dust at a mass ratio of tobacco stems to tobacco dust absolute dry pulp of 1:1.125 to a beating degree of 20±2°SR, to obtain tobacco slurry;

[0108] Step (12), mixing the gynostemma pentaphyllum slurry and the tobacco slurry at a ratio of 1:5 in terms of absolute dry pulp mass, and then preparing a primary sheet according to a conventional papermaking method;

[0109] The specific process of preparing primary sheets by conventional papermaking is: flow conveying - wire forming - pressing - sheet base drying. The sheet base thickness is controlled at 0.15-0.2mm.

[0110] Step (13), coating the mixed coating liquid on both sides of the primary sheet, drying after coating, controlling the coating rate to 40%, and drying to a mass percentage of water content of 16%, thereby obtaining tobacco sheets containing Gynostemma pentaphyllum rhizomes.

[0111] Example 4

[0112] A method for preparing tobacco sheets containing Gynostemma pentaphyllum rhizomes, comprising preparing Gynostemma pentaphyllum slurry, preparing a coating liquid, and preparing tobacco-Gynostemma pentaphyllum sheets, wherein:

[0113] The preparation of Gynostemma pentaphyllum slurry comprises the following steps:

[0114] Step (1), air-drying the rhizome of Gynostemma pentaphyllum to a dryness rate of 90%;

[0115] Step (2), cutting the air-dried Gynostemma pentaphyllum rhizome into segments, wherein the length of the segments after cutting varies from 3 to 20 cm;

[0116] Step (3), the cut Gynostemma pentaphyllum rhizome is mixed with a 65% by volume ethanol aqueous solution at a material-liquid mass ratio of 1:12, and after mixing, heated and extracted once at a temperature of 78° C., each extraction time being 60 minutes;

[0117] Step (4), removing the gynostemma pentaphyllum rhizome from the solvent, placing it on a grid for 30 minutes, draining the gynostemma pentaphyllum rhizome, and mixing it with a 3% by mass sodium hydroxide aqueous solution at a material-liquid mass ratio of 1:12 based on the absolute dry weight, and heating and extracting it at 90° C. for 2 times, each extraction time being 20 minutes;

[0118] Step (5), removing the gynostemma pentaphyllum rhizome from the solvent, placing it on a grid for 30 minutes, draining the gynostemma pentaphyllum rhizome, and mixing it with water at a material-liquid mass ratio of 1:12 for 30 minutes based on the absolute dry weight, then removing the gynostemma pentaphyllum rhizome from the water, placing it on a grid for 30 minutes, and draining the water; this step is repeated 3 times to remove the residual sodium hydroxide in the gynostemma pentaphyllum rhizome;

[0119] Step (6), tearing the drained Gynostemma pentaphyllum rhizome through a wire splitting machine to produce filamentous fibers with a diameter of 0.2-2 mm;

[0120] Step (7), preparing the obtained Gynostemma pentaphyllum filamentous fibers into Gynostemma pentaphyllum slurry by a conventional refining process, wherein the beating degree of the Gynostemma pentaphyllum slurry is 55±2°SR;

[0121] The coating solution preparation includes the following steps:

[0122] Step (8), weighing a certain mass of tobacco stems, calculating the absolute dry weight, adding water at a material-liquid mass ratio of 1:5, mixing, heating and extracting at a temperature of 65±5° C. for 40 minutes, then performing solid-liquid separation to obtain extracted tobacco stems and an extract, and then performing reduced pressure distillation on the extract at 0.02±0.01 MPa, and distilling and concentrating to a solid content of 40±2%, thereby obtaining a tobacco stem concentrate;

[0123] Step (9), weighing a certain mass of tobacco dust, calculating the absolute dry weight, adding water at a material-liquid mass ratio of 1:5, mixing, heating and extracting at a temperature of 65±5° C. for 40 minutes, then performing solid-liquid separation to obtain extracted tobacco dust and an extract, and then performing reduced pressure distillation on the extract at 0.02±0.01 MPa, and distilling and concentrating to a solid content of 40±2%, thereby obtaining a tobacco dust concentrate;

[0124] Step (10), mixing the obtained tobacco stem concentrate and tobacco dust concentrate in a mass ratio of 5:2 to obtain a mixed coating liquid;

[0125] The preparation of tobacco-Gynostemma pentaphyllum slices comprises the following steps:

[0126] Step (11), grinding the extracted tobacco stems to a beating degree of 15±2°SR by a disk grinder, and then mixing and grinding with the extracted tobacco dust at a mass ratio of tobacco stems to tobacco dust absolute dry pulp of 1:1.25 to a beating degree of 20±2°SR, to obtain tobacco slurry;

[0127] Step (12), mixing the gynostemma pentaphyllum slurry and the tobacco slurry at a ratio of 1:6 in terms of absolute dry pulp mass, and then preparing a primary sheet by a conventional papermaking method;

[0128] The specific process of preparing primary sheets by conventional papermaking is: flow conveying - wire forming - pressing - sheet base drying. The sheet base thickness is controlled at 0.15-0.2mm.

[0129] Step (13): coating the mixed coating liquid on both sides of the primary sheet, drying the sheet after coating, controlling the coating rate to 32%, and drying the sheet to a water content of 18% by mass to obtain tobacco sheets containing Gynostemma pentaphyllum rhizomes.

[0130] Example 5

[0131] A method for preparing tobacco sheets containing Gynostemma pentaphyllum rhizomes, comprising preparing Gynostemma pentaphyllum slurry, preparing a coating liquid, and preparing tobacco-Gynostemma pentaphyllum sheets, wherein:

[0132] The preparation of Gynostemma pentaphyllum slurry comprises the following steps:

[0133] Step (1), air-drying the rhizome of Gynostemma pentaphyllum to an absolute dryness rate of 92%;

[0134] Step (2), cutting the air-dried Gynostemma pentaphyllum rhizome into segments, wherein the length of the segments after cutting varies from 3 to 20 cm;

[0135] Step (3), the cut Gynostemma pentaphyllum rhizome is mixed with a 75% by volume ethanol aqueous solution at a material-liquid mass ratio of 1:13 based on the absolute dry weight, and after mixing, heated and extracted twice at a temperature of 78° C., each extraction time being 20 minutes;

[0136] Step (4), removing the gynostemma pentaphyllum rhizome from the solvent, placing it on a grid for 30 minutes, draining the gynostemma pentaphyllum rhizome, and mixing it with a 2% by mass sodium hydroxide aqueous solution at a material-liquid mass ratio of 1:14 based on the absolute dry weight, and after mixing, heating and extracting it once at a temperature of 95° C. for 60 minutes;

[0137] Step (5), removing the gynostemma pentaphyllum rhizome from the solvent, placing it on a grid for 30 minutes, draining the gynostemma pentaphyllum rhizome, and mixing it with water at a material-liquid mass ratio of 1:14 for 30 minutes based on the absolute dry weight, then removing the gynostemma pentaphyllum rhizome from the water, placing it on a grid for 30 minutes, and draining the water; this step is repeated 3 times to remove the residual sodium hydroxide in the gynostemma pentaphyllum rhizome;

[0138] Step (6), tearing the drained Gynostemma pentaphyllum rhizome through a wire splitting machine to produce filamentous fibers with a diameter of 0.2-2 mm;

[0139] Step (7), preparing the obtained Gynostemma pentaphyllum filamentous fibers into Gynostemma pentaphyllum slurry by a conventional refining process, wherein the beating degree of the Gynostemma pentaphyllum slurry is 55±2°SR;

[0140] The coating solution preparation includes the following steps:

[0141] Step (8), weighing a certain mass of tobacco stems, calculating the absolute dry weight, adding water at a material-liquid mass ratio of 1:6, mixing, heating and extracting at a temperature of 65±5° C. for 40 minutes, then performing solid-liquid separation to obtain extracted tobacco stems and an extract, and then performing reduced pressure distillation on the extract at 0.02±0.01 MPa, and distilling and concentrating to a solid content of 40±2%, thereby obtaining a tobacco stem concentrate;

[0142] Step (9), weighing a certain mass of tobacco dust, calculating the absolute dry weight, adding water at a material-liquid mass ratio of 1:6, mixing, heating and extracting at a temperature of 65±5° C. for 40 minutes, then performing solid-liquid separation to obtain extracted tobacco dust and an extract, and then performing reduced pressure distillation on the extract at 0.02±0.01 MPa, and distilling and concentrating to a solid content of 40±2%, thereby obtaining a tobacco dust concentrate;

[0143] Step (10), mixing the obtained tobacco stem concentrate and tobacco dust concentrate in a mass ratio of 11:3 to obtain a mixed coating liquid;

[0144] The preparation of tobacco-Gynostemma pentaphyllum slices comprises the following steps:

[0145] Step (11), grinding the extracted tobacco stems to a beating degree of 15±2°SR by a disk grinder, and then mixing and grinding with the extracted tobacco dust at a mass ratio of tobacco stems to tobacco dust absolute dry pulp of 1:1.375 to a beating degree of 20±2°SR, to obtain tobacco slurry;

[0146] Step (12), mixing the gynostemma pentaphyllum slurry and the tobacco slurry at a ratio of 1:7 in terms of absolute dry pulp mass, and then preparing a primary sheet according to a conventional papermaking method;

[0147] The specific process of preparing primary sheets by conventional papermaking is: flow conveying - wire forming - pressing - sheet base drying. The sheet base thickness is controlled at 0.15-0.2mm.

[0148] Step (13), coating the mixed coating liquid on both sides of the primary sheet, drying after coating, controlling the coating rate to 40%, and drying to a mass percentage of water content of 20%, thereby obtaining tobacco sheets containing Gynostemma pentaphyllum rhizomes.

[0149] The above embodiments of the present invention are not intended to limit the scope of protection of the present invention, and the implementation methods of the present invention are not limited thereto. All other modifications, replacements or changes made to the above structures of the present invention based on the above contents of the present invention, in accordance with common technical knowledge and customary means in this field, without departing from the above basic technical ideas of the present invention, should fall within the scope of protection of the present invention.

Claims

1. A method for preparing a Gynostemma pentaphyllum slurry containing Gynostemma pentaphyllum rhizomes, characterized in that: The method comprises the following steps: Step (1), air-drying the rhizome of Gynostemma pentaphyllum to a dryness ratio of 85% to 95%; Step (2), cutting the air-dried Gynostemma pentaphyllum rhizomes into segments with a grass cutter, wherein the length of the segments after cutting is 3 to 20 cm; Step (3), the cut Gynostemma pentaphyllum rhizome is mixed with 50% to 80% ethanol aqueous solution in a ratio of 1:8 to 15 by volume based on the absolute dry weight, and after mixing, the mixture is heated and extracted at a temperature of 60° C. to 80° C. for 1 to 2 times, each extraction time being 20 to 60 minutes; Step (4), removing the gynostemma pentaphyllum rhizome from the solvent, placing it on a grid for 30 minutes, draining the gynostemma pentaphyllum rhizome, and mixing it with a 1% to 5% sodium hydroxide aqueous solution at a material-liquid mass ratio of 1:8 to 15 based on the absolute dry weight, and after mixing, heating and extracting it at a temperature of 80° C. to 100° C. for 1 to 2 times, each extraction time being 20 to 60 minutes; Step (5), removing the gynostemma pentaphyllum rhizome from the solvent, placing it on a grid for 30 minutes, draining the gynostemma pentaphyllum rhizome, and mixing it with water at a material-liquid mass ratio of 1:8 to 15 for 30 minutes based on the absolute dry weight, then removing the gynostemma pentaphyllum rhizome from the water, placing it on a grid for 30 minutes, and draining the water; this step is repeated 3 times to remove the residual sodium hydroxide in the gynostemma pentaphyllum rhizome; Step (6), tearing the drained Gynostemma pentaphyllum rhizome through a wire splitting machine to produce filamentous fibers with a diameter of 0.2-2 mm; Step (7): The obtained Gynostemma pentaphyllum filamentous fibers are prepared into Gynostemma pentaphyllum slurry by a conventional pulping process, wherein the beating degree of the Gynostemma pentaphyllum slurry is 55±2°SR.

2. A method for preparing tobacco sheets containing Gynostemma pentaphyllum rhizomes, characterized in that: The method comprises the steps of preparing a gynostemma pentaphyllum slurry, preparing a coating liquid and preparing a tobacco-gynostemma pentaphyllum slice. The preparation of the Gynostemma pentaphyllum slurry comprises the following steps: Step (1), air-drying the rhizome of Gynostemma pentaphyllum to a dryness ratio of 85% to 95%; Step (2), cutting the air-dried Gynostemma pentaphyllum rhizomes into segments with a grass cutter, wherein the length of the segments after cutting is 3 to 20 cm; Step (3), the cut Gynostemma pentaphyllum rhizome is mixed with 50% to 80% ethanol aqueous solution in a ratio of 1:8 to 15 by volume based on the absolute dry weight, and after mixing, the mixture is heated and extracted at a temperature of 60° C. to 80° C. for 1 to 2 times, each extraction time being 20 to 60 minutes; Step (4), removing the gynostemma pentaphyllum rhizome from the solvent, placing it on a grid for 30 minutes, draining the gynostemma pentaphyllum rhizome, and mixing it with a 1% to 5% sodium hydroxide aqueous solution at a material-liquid mass ratio of 1:8 to 15 based on the absolute dry weight, and after mixing, heating and extracting it at a temperature of 80° C. to 100° C. for 1 to 2 times, each extraction time being 20 to 60 minutes; Step (5), removing the gynostemma pentaphyllum rhizome from the solvent, placing it on a grid for 30 minutes, draining the gynostemma pentaphyllum rhizome, and mixing it with water at a material-liquid mass ratio of 1:8 to 15 for 30 minutes based on the absolute dry weight, then removing the gynostemma pentaphyllum rhizome from the water, placing it on a grid for 30 minutes, and draining the water; this step is repeated 3 times to remove the residual sodium hydroxide in the gynostemma pentaphyllum rhizome; Step (6), tearing the drained Gynostemma pentaphyllum rhizome through a wire splitting machine to produce filamentous fibers with a diameter of 0.2-2 mm; Step (7): The obtained Gynostemma pentaphyllum filamentous fibers are prepared into Gynostemma pentaphyllum slurry by a conventional pulping process, wherein the beating degree of the Gynostemma pentaphyllum slurry is 55±2°SR.

3. The method for preparing tobacco sheets containing Gynostemma pentaphyllum rhizomes according to claim 2, wherein: The coating solution preparation comprises the following steps: Step (8), weighing a certain mass of tobacco stems, calculating the absolute dry weight, adding water at a material-liquid mass ratio of 1:3 to 7, mixing, heating and extracting at a temperature of 65±5° C. for 40 minutes, then performing solid-liquid separation to obtain extracted tobacco stems and an extract, and then performing reduced pressure distillation on the extract at a pressure of 0.02±0.01 MPa, and distilling and concentrating to a solid content of 40±2%, thereby obtaining a tobacco stem concentrate; Step (9), weighing a certain mass of tobacco dust, calculating the absolute dry weight, adding water at a material-liquid mass ratio of 1:3 to 7, mixing, heating and extracting at a temperature of 65±5° C. for 40 minutes, then performing solid-liquid separation to obtain extracted tobacco dust and an extract, and then performing reduced pressure distillation on the extract at a pressure of 0.02±0.01 MPa, and distilling and concentrating to a solid content of 40±2%, thereby obtaining a tobacco dust concentrate; Step (10): mixing the obtained tobacco stem concentrate and tobacco dust concentrate in a mass ratio of 1:3 to 5:1 to obtain a mixed coating liquid.

4. The method for preparing the tobacco sheet containing Gynostemma pentaphyllum rhizome according to claim 3, characterized in that: The preparation of the tobacco-Gynostemma pentaphyllum slice comprises the following steps: Step (11), grinding the extracted tobacco stems to a beating degree of 15±2°SR by a disk grinder, and then mixing and grinding with the extracted tobacco dust at a mass ratio of tobacco stems to tobacco dust absolute dry pulp of 1:1-1.5 to a beating degree of 20±2°SR, to obtain tobacco slurry; Step (12), mixing the gynostemma pentaphyllum slurry and the tobacco slurry at a ratio of 1:4 to 8 in terms of absolute dry pulp mass, and then preparing primary sheets according to a conventional papermaking method; Step (13): coating the mixed coating liquid on both sides of the primary sheet, drying the sheet after coating, controlling the coating rate to be 30% to 45%, and drying the sheet to a water content of 14% to 22% by mass, thereby obtaining tobacco sheets containing Gynostemma pentaphyllum rhizomes.

5. Use of the tobacco sheet containing Gynostemma pentaphyllum rhizomes obtained by the preparation method according to any one of claims 2 to 4, wherein the entire tobacco sheet can be used as the outer wrapper of cigars.

6. Use of the tobacco sheet containing Gynostemma pentaphyllum rhizomes obtained by the preparation method according to any one of claims 2 to 4 in cigarettes, wherein the tobacco sheet is cut into shreds by conventional means using a shredder, and the size and standard of the shredded shreds are the same as those of conventional shredded tobacco to obtain tobacco sheet shreds, and the mass percentage of the tobacco sheet shreds in the whole cigarette shredded tobacco is 2% to 50% calculated on an absolute dry weight basis.