A paper-forming process for reconstituted tobacco leaves and its preparation method
By using a powder paper forming process and a composite sheet base structure of ultrafine powder and fiber pulp, the problem of low coating rate of reconstituted tobacco leaves in papermaking method is solved, thereby improving the quality and coating effect of tobacco products.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHINA TOBACCO YUNNAN IND
- Filing Date
- 2024-10-30
- Publication Date
- 2026-07-17
AI Technical Summary
The low coating rate of reconstituted tobacco leaves produced by the papermaking process results in poor absorbency and permeability, which affects the quality of tobacco products.
The paper forming process involves pulverizing tobacco raw materials into ultrafine powder, extracting tobacco extracts and residues, adding binders, mixing with long and short fiber pulp to form a multi-layer sheet structure, and then drying and coating to improve the coating rate.
It improves the coating rate of reconstituted tobacco leaves, enhances the strength of the leaf base and the carrying capacity of the coating liquid, and improves the quality of tobacco products.
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Abstract
Description
Technical Field
[0001] This invention relates to the field of reconstituted tobacco, and more specifically, to a powder paper forming process for reconstituted tobacco and its preparation method. Background Technology
[0002] Reconstituted tobacco is a new type of tobacco raw material that uses tobacco leaves, stems, and dust to reprocess and recombine through specific processes. Common reconstituted tobacco processes include roll pressing, slurry pressing, and papermaking.
[0003] Compared with reconstituted tobacco produced by roll pressing and slurry pressing, reconstituted tobacco produced by papermaking has advantages such as better filling performance and lower tar release. However, the sheet base prepared by papermaking reconstituted tobacco has disadvantages such as low bulk and poor absorbency and permeability, which seriously affects the coating rate.
[0004] Therefore, how to provide a process that can effectively improve the coating rate of reconstituted tobacco leaves produced by papermaking has become a technical problem that urgently needs to be solved in this field. Summary of the Invention
[0005] One objective of this invention is to provide a new technology solution for preparing reconstituted tobacco using a paper forming process, which can effectively improve the coating rate of reconstituted tobacco produced by papermaking.
[0006] According to a first aspect of the present invention, a method for preparing reconstituted tobacco leaves using a paper forming process is provided.
[0007] The method for preparing reconstituted tobacco using the paper forming process includes the following steps:
[0008] Step (1): The tobacco raw material is crushed into ultrafine powder, and the ultrafine powder is extracted to obtain tobacco extract and tobacco residue;
[0009] Step (2): Concentrate the tobacco extract to obtain a concentrated solution;
[0010] Step (3): Add binder to tobacco powder residue and mix evenly to obtain a mixture;
[0011] Step (4): Add long fiber slurry and short fiber slurry to the mixture respectively to obtain long fiber mixture and short fiber mixture;
[0012] Step (5): The long fiber mixture is formed into a middle layer substrate, and the short fiber mixture is formed into an upper layer substrate and a lower layer substrate, wherein the oven-dry weight of the middle layer substrate is greater than that of the upper layer substrate and the lower layer substrate;
[0013] Step (6): Combine the upper, middle and lower layers of the substrate to obtain a composite substrate. After drying, use the concentrated liquid as the coating liquid for coating and drying treatment to obtain reconstituted tobacco leaves.
[0014] Optionally, step (1) is as follows:
[0015] The tobacco raw material is first crushed to a particle size of 30-60 mesh, and then refined to a particle size of 200-500 mesh to obtain ultrafine powder. The ultrafine powder is then extracted to obtain tobacco extract and tobacco residue.
[0016] Optionally, the extraction process in step (1) is a water extraction process, and the material-to-liquid ratio of the water extraction process is 1:7-1:10.
[0017] Optionally, the adhesive in step (3) is at least one of guar gum, tamarind polysaccharide gum or CMC, and the amount of adhesive added is 0.2-1wt%.
[0018] Optionally, the long fiber pulp in step (4) is obtained by defibering and pulping of softwood pulp board or hemp pulp board, and the short fiber pulp is obtained by defibering and pulping of hardwood pulp board, and the mass ratio of ultrafine powder to pulp is (84-86):(15-16).
[0019] Optionally, the solid content concentration of the sizing sheet in step (5) is 1-2 wt%.
[0020] Optionally, the oven-dry weight of the upper and lower substrates in step (5) is 12-15 g / m³. 2 The oven-dry weight of the middle layer substrate is 20-30 g / m³. 2 .
[0021] Optionally, in step (6), the composite substrate is dried using a Yankee cylinder at a temperature of 120-140°C, and the coated substrate is dried using a tunnel convection drying method at a temperature of 80-100°C.
[0022] According to a second aspect of the present invention, a paper forming process for reconstituted tobacco leaves is provided.
[0023] The reconstituted tobacco leaf produced by the paper forming process is prepared by the paper forming process reconstituted tobacco leaf preparation method of the present invention.
[0024] The method for preparing reconstituted tobacco leaves using the powder paper forming process provided by this invention has the following advantages:
[0025] (1) The tobacco residue obtained after extraction from ultrafine powder has a small volume and a large specific surface area, which is conducive to carrying more coating liquid and can improve the coating rate.
[0026] (2) The middle layer of the composite substrate can effectively enhance the strength of the composite substrate, while the upper and lower layers are formed by papermaking of short fiber mixtures, which makes the upper and lower layers have more gaps than the middle layer, which is beneficial to improving the coating rate. Detailed Implementation
[0027] Various exemplary embodiments of the present invention will now be described in detail. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of the components and steps set forth in these embodiments do not limit the scope of the invention.
[0028] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.
[0029] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.
[0030] In all the examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.
[0031] The method for preparing reconstituted tobacco leaves using the powder paper forming process provided by this invention includes the following steps:
[0032] Step (1): The tobacco raw material is crushed into ultrafine powder, and the ultrafine powder is extracted to obtain tobacco extract and tobacco residue.
[0033] Step (1) can be specifically described as follows:
[0034] The tobacco raw material is first crushed to a particle size of 30-60 mesh, and then refined to a particle size of 200-500 mesh to obtain ultrafine powder. The ultrafine powder is then extracted to obtain tobacco extract and tobacco residue.
[0035] The tobacco residue obtained after extraction from ultrafine powder has a small volume and a large specific surface area, which is conducive to carrying more coating liquid and can improve the coating rate.
[0036] The extraction process in step (1) is water extraction, and the material-to-liquid ratio in water extraction can be 1:7-1:10.
[0037] Step (2): Concentrate the tobacco extract to obtain a concentrate.
[0038] Step (3): Add a binder to the tobacco powder residue and mix well to obtain a mixture.
[0039] The adhesive in step (3) can be at least one of guar gum, tamarind polysaccharide gum, or CMC, and the amount of adhesive added is 0.2-1 wt%. The amount of adhesive added is based on the mass percentage of the adhesive relative to the total mass of the ultrafine powder and the slurry.
[0040] The binder allows the subsequent slurry and tobacco residue to bond better during the papermaking process.
[0041] Step (4): Add long fiber slurry and short fiber slurry to the mixture to obtain long fiber mixture and short fiber mixture.
[0042] In actual operation, to ensure the uniformity of the slurry, it is pumped through a mixing tank, a buffer tank, and a discharge tank in sequence. To further ensure uniformity, the discharge tank is divided into three layers: upper, middle, and lower. Each layer has three discharge pipes, distributed at 120° intervals within that layer. Furthermore, the slurry level in the discharge tank must be maintained at 70% or higher.
[0043] In step (4), the long fiber pulp is obtained by defibering and beating softwood pulp board or hemp pulp board, and the short fiber pulp is obtained by defibering and beating hardwood pulp board. The mass ratio of ultrafine powder to pulp is (84-86):(15-16).
[0044] The aforementioned slurry refers to the slurry after pulping.
[0045] Step (5): The long fiber mixture is formed into a middle layer substrate, and the short fiber mixture is formed into an upper layer substrate and a lower layer substrate, wherein the oven-dry weight of the middle layer substrate is greater than that of the upper layer substrate and the lower layer substrate.
[0046] The middle layer of the composite substrate can effectively enhance the strength of the composite substrate, while the upper and lower layers are formed by papermaking of short fiber mixtures, which makes the upper and lower layers have more gaps than the middle layer, which is beneficial to improving the coating rate.
[0047] The solid content concentration of the sizing sheet in step (5) can be 1-2 wt%.
[0048] The oven-dry weight of the upper and lower substrate layers in step (5) is 12-15 g / m³. 2 The oven-dry weight of the middle layer substrate is 20-30 g / m³. 2 .
[0049] Step (6): Combine the upper, middle and lower layers of the substrate to obtain a composite substrate. After drying, use the concentrated liquid as the coating liquid for coating and drying treatment to obtain reconstituted tobacco leaves.
[0050] In step (6), the composite substrate is dried using a Yankee cylinder at a temperature of 120-140℃, and the coated substrate is dried using a tunnel convection drying method at a temperature of 80-100℃.
[0051] The film base contains almost no fragrance substances and is not afraid of high-temperature baking. It can be dried using a Yankee cylinder to achieve a high-temperature and rapid drying effect. Tunnel convection drying has a lower temperature than Yankee cylinder drying. Using tunnel convection drying to dry the coated film base can effectively reduce the volatilization of volatile fragrance components in the coating solution.
[0052] Unless otherwise specified, the experimental methods used in the following examples are conventional methods, and the materials and reagents used are commercially available. Unless otherwise specified, the equipment used in the experiments is well known to those skilled in the art.
[0053] Example 1
[0054] The tobacco raw material is first pulverized to a particle size of 30-60 mesh, and then refined to a particle size of 200-500 mesh to obtain ultrafine powder. 500 g of the ultrafine powder is extracted with water at 65℃ at a material-to-liquid ratio of 1:8 for 45 min. Solid-liquid separation is performed using nylon filter cloth to obtain tobacco extract and tobacco residue. The tobacco residue is then divided into two portions, A and B, at a mass ratio of A:B=2:1.
[0055] Tobacco extract was concentrated under vacuum at 65°C and 80 mPa to obtain a concentrate with a Brix of 50%.
[0056] Add 1.57g of tamarind polysaccharide gum binder to tobacco residue A and mix thoroughly. Add 0.78g of tamarind polysaccharide gum binder to tobacco residue B and mix thoroughly. The total amount of tamarind polysaccharide gum added (2.35g) is equivalent to 0.4wt% of the total mass of the ultrafine powder and slurry (freezing degree 45°SR) (588.2g). The tamarind polysaccharide gum was first prepared to a 1wt% concentration before being added to the tobacco residue.
[0057] Softwood pulp and hardwood pulp were separately defiberized and pulped to 45°SR. 58.8 g of softwood pulp was mixed evenly with tobacco residue A containing tamarind polysaccharide gum to obtain long-fiber pulp mixture C. 29.4 g of hardwood pulp was mixed evenly with tobacco residue B containing tamarind polysaccharide gum to obtain short-fiber pulp mixture D.
[0058] Using long fiber sizing mixture C as the intermediate sizing material, the oven-dry basis weight of the intermediate sheet formed by papermaking is 30 g / m². 2 Short fiber slurry mixture D is used as the upper and lower slurry layers. The oven-dry basis weight of the upper and lower sheet substrates formed by papermaking is 15 g / m³. 2.
[0059] A composite substrate is obtained by mechanically combining the upper, middle, and lower substrate layers, with an oven-dry weight of 60 g / m³. 2 .
[0060] The composite substrate was dried in a Yankee cylinder at a temperature of 120-140℃.
[0061] The dried composite substrate was coated with a concentrated liquid, and the coated substrate was dried by tunnel convection drying at a temperature of 80-100℃ to obtain reconstituted tobacco leaf S1 prepared by the powder paper forming process.
[0062] Example 2
[0063] The tobacco raw material is first pulverized to a particle size of 30-60 mesh, and then refined to a particle size of 200-500 mesh to obtain ultrafine powder. 500 g of the ultrafine powder is extracted with water at 65℃ at a material-to-liquid ratio of 1:8 for 45 min. Solid-liquid separation is performed using nylon filter cloth to obtain tobacco extract and tobacco residue. The tobacco residue is then divided into two portions, A and B, at a mass ratio of A:B = 2:1.
[0064] Tobacco extract was concentrated under vacuum at 65°C and 80 mPa to obtain a concentrate with a Brix of 50%.
[0065] Add 1.57g of guar gum binder to tobacco residue A and mix thoroughly. Add 0.78g of guar gum binder to tobacco residue B and mix thoroughly. The total amount of guar gum added (2.35g) is equivalent to 0.4wt% of the total mass of the ultrafine powder and slurry (freezing degree 45°SR) (588.2g). The guar gum was first prepared to a 1wt% concentration before being added to the tobacco residue.
[0066] Softwood pulp and hardwood pulp were separately defiberized and pulped to 45°SR. 58.8 g of softwood pulp was mixed evenly with tobacco residue A containing guar gum to obtain long-fiber pulp mixture C. 29.4 g of hardwood pulp was mixed evenly with tobacco residue B containing guar gum to obtain short-fiber pulp mixture D.
[0067] Using long fiber sizing mixture C as the intermediate sizing material, the oven-dry basis weight of the intermediate sheet formed by papermaking is 30 g / m². 2 Short fiber slurry mixture D is used as the upper and lower slurry layers. The oven-dry basis weight of the upper and lower sheet substrates formed by papermaking is 15 g / m³. 2 .
[0068] A composite substrate is obtained by mechanically combining the upper, middle, and lower substrate layers, with an oven-dry weight of 60 g / m³. 2 .
[0069] The composite substrate was dried in a Yankee cylinder at a temperature of 120-140℃.
[0070] The dried composite substrate was coated with a concentrated liquid, and the coated substrate was dried by tunnel convection drying at a temperature of 80-100℃ to obtain reconstituted tobacco leaf S2 prepared by the powder paper forming process.
[0071] Comparative Example 1
[0072] 500 g of tobacco raw material was extracted with water at 65℃ at a material-to-liquid ratio of 1:8 for 45 min. Solid-liquid separation was performed using nylon filter cloth to obtain the extract and residue. The tobacco was pulped to obtain a pulp with a freeness of 45°SR, and 88.2 g of wood pulp (including 58.8 g of softwood pulp and 29.4 g of hardwood pulp) with a freeness of 45°SR was added. The tobacco extract was concentrated under vacuum at 65℃ and 80 mPa to obtain a concentrate with a whiteness of 50%. After papermaking, the oven-dry weight was 60 g / m³. 2 The tobacco leaf base was dried in a Yankee cylinder at a temperature of 120-140℃. The tobacco leaf base was coated with a concentrated solution with a Brix of 50%, and the coated tobacco leaf base was dried using a tunnel convection drying method at a temperature of 80-100℃ to obtain conventional reconstituted tobacco leaf D1.
[0073] Comparative Example 2
[0074] 500 g of tobacco raw material was extracted with water at 65℃ at a material-to-liquid ratio of 1:8 for 45 min. Solid-liquid separation was performed using nylon filter cloth to obtain the extract and residue. The tobacco was pulped to obtain a pulp with a freeness of 45°SR, and 55 g of wood pulp pulp (including 36.7 g of softwood pulp and 18.3 g of hardwood pulp) with a freeness of 45°SR was added. The tobacco extract was concentrated under vacuum at 65℃ and 80 mPa to obtain a concentrate with a whiteness of 50%. After papermaking, the oven-dry weight was 60 g / m³. 2 The tobacco substrate was dried in a Yankee cylinder at a temperature of 120-140℃. The substrate was coated with a concentrate with a Brix of 50%, and the coated substrate was dried using a tunnel convection drying method at a temperature of 80-100℃ to obtain conventional reconstituted tobacco leaf D2.
[0075] Table 1 Comparison of reconstituted tobacco leaf samples using different processes
[0076]
[0077] While specific embodiments of the invention have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims
1. A method for preparing reconstituted tobacco using a paper forming process, characterized in that, Includes the following steps: Step (1): The tobacco raw material is crushed into ultrafine powder, and the ultrafine powder is extracted to obtain tobacco extract and tobacco residue; Step (2): Concentrate the tobacco extract to obtain a concentrated solution; Step (3): Add binder to tobacco powder residue and mix evenly to obtain a mixture; Step (4): Add long fiber pulp and short fiber pulp to the mixture respectively to obtain long fiber mixture and short fiber mixture. The long fiber pulp is obtained by defibering and beating to 45°SR using softwood pulp board or hemp pulp board. The short fiber pulp is obtained by defibering and beating to 45°SR using hardwood pulp board. The mass ratio of ultrafine powder to pulp is (84-86):(15-16). Step (5): The long fiber mixture is formed into a middle layer substrate, and the short fiber mixture is formed into an upper layer substrate and a lower layer substrate, wherein the oven-dry weight of the middle layer substrate is greater than that of the upper layer substrate and the lower layer substrate; Step (6): Combine the upper, middle and lower layers of the substrate to obtain a composite substrate. After drying, use the concentrated liquid as the coating liquid for coating and drying treatment to obtain reconstituted tobacco leaves.
2. The method for preparing reconstituted tobacco leaves using the paper forming process according to claim 1, characterized in that, The specific steps (1) are as follows: The tobacco raw material is first crushed to a particle size of 30-60 mesh, and then refined to a particle size of 200-500 mesh to obtain ultrafine powder. The ultrafine powder is then extracted to obtain tobacco extract and tobacco residue.
3. The method for preparing reconstituted tobacco leaves using the paper forming process according to claim 1, characterized in that, The extraction process in step (1) is water extraction, and the material-to-liquid ratio in water extraction is 1:7-1:
10.
4. The method for preparing reconstituted tobacco leaves using the paper forming process according to claim 1, characterized in that, The adhesive in step (3) is at least one of guar gum, tamarind polysaccharide gum or CMC, and the amount of adhesive added is 0.2-1wt%.
5. The method for preparing reconstituted tobacco leaves using the paper forming process according to claim 1, characterized in that, The solid content concentration of the sizing sheet in step (5) is 1-2 wt%.
6. The method for preparing reconstituted tobacco leaves using the paper forming process according to claim 1, characterized in that, The oven-dry weight of the upper and lower substrates in step (5) is 12-15 g / m³. 2 The oven-dry weight of the middle layer substrate is 20-30 g / m³. 2 .
7. The method for preparing reconstituted tobacco leaves using the paper forming process according to claim 1, characterized in that, In step (6), the composite substrate is dried using a Yankee cylinder at a temperature of 120-140°C, and the coated substrate is dried using a tunnel convection drying method at a temperature of 80-100°C.
8. A paper-forming process for reconstituted tobacco leaves, characterized in that, Prepared by the preparation method according to any one of claims 1-7.