Powder paper forming process reconstituted tobacco and preparation method thereof

Abstract

The invention discloses powder paper forming process reconstituted tobacco and a preparation method thereof.The preparation method comprises the steps that tobacco raw materials are smashed into ultra-micro powder, the ultra-micro powder is extracted, and tobacco extract and tobacco powder residues are obtained; concentrating the tobacco extract to obtain a concentrated solution; adding an adhesive into the tobacco powder residues, and uniformly mixing to obtain a mixture; respectively adding the long fiber slurry and the short fiber slurry into the mixture to obtain a long fiber mixture and a short fiber mixture; the long fiber mixture is made with paper to form a middle-layer sheet base, the short fiber mixture is made with paper to form an upper-layer sheet base and a lower-layer sheet base, and the absolute dry weight of the middle-layer sheet base is larger than that of the upper-layer sheet base and that of the lower-layer sheet base; and compounding the upper-layer sheet base, the middle-layer sheet base and the lower-layer sheet base to obtain a composite sheet base, drying the composite sheet base, and carrying out coating treatment and drying treatment by taking the concentrated solution as a coating solution. The coating rate of the paper-making reconstituted tobacco can be effectively increased.

Description

Technical Field

[0001] The present invention relates to the field of reconstituted tobacco, and more specifically, to a powder paper forming process reconstituted tobacco and a preparation method thereof. Background Art

[0002] Reconstituted tobacco is a new type of tobacco raw material that is reprocessed and reorganized from tobacco leaves, tobacco stems, tobacco dust and other raw materials through a specific process. Common reconstituted tobacco processes include roller pressing, thick pulping and papermaking.

[0003] Compared with roller-pressed reconstituted tobacco and thick pulp reconstituted tobacco, paper-made reconstituted tobacco has the advantages of good filling performance and low tar release. However, the sheet base prepared from paper-made reconstituted tobacco has the disadvantages of low bulk, poor absorption and permeability, which seriously affects the coating rate.

[0004] Therefore, how to provide a process that can effectively improve the coating rate of papermaking reconstituted tobacco 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 the preparation of reconstituted tobacco leaves by a powder paper forming process, which can effectively improve the coating rate of reconstituted tobacco leaves by a papermaking process.

[0006] According to a first aspect of the present invention, a method for preparing reconstituted tobacco using a powder paper molding process is provided.

[0007] The preparation method of the powder paper forming process reconstituted tobacco comprises the following steps:

[0008] Step (1): crushing tobacco raw materials into ultrafine powder, extracting the ultrafine powder to obtain tobacco extract and tobacco powder residue;

[0009] Step (2): concentrating the tobacco extract to obtain a concentrated solution;

[0010] Step (3): adding a binder to the tobacco powder residue and mixing them evenly to obtain a mixture;

[0011] Step (4): adding the long fiber slurry and the short fiber slurry to the mixture respectively to obtain a long fiber mixture and a short fiber mixture;

[0012] Step (5): papermaking the long fiber mixture to form a middle layer base, and papermaking the short fiber mixture to form an upper layer base and a lower layer base, wherein the middle layer base has a greater absolute dry basis weight than the upper layer base and the lower layer base;

[0013] Step (6): Compounding the upper sheet base, the middle sheet base and the lower sheet base to obtain a composite sheet base, drying the composite sheet base, and applying a coating treatment with the concentrated liquid as a coating liquid and drying the composite sheet base to obtain reconstituted tobacco leaves.

[0014] Optionally, the step (1) is specifically as follows:

[0015] The tobacco raw material is firstly crushed to a particle size of 30-60 meshes, and then refined to a particle size of 200-500 meshes to obtain ultrafine powder, and the ultrafine powder is subjected to extraction treatment to obtain tobacco extract and tobacco powder residue.

[0016] Optionally, the extraction treatment in step (1) is a water extraction treatment, and the solid-liquid ratio of the water extraction treatment 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 the adhesive added is 0.2-1wt%.

[0018] Optionally, the long fiber pulp in step (4) is obtained by defibration and pulping of a coniferous wood pulp board or a hemp pulp board, and the short fiber pulp is obtained by defibration and pulping of a hardwood wood pulp board, and the mass ratio of the ultrafine powder to the pulp is (84-86):(15-16).

[0019] Optionally, the solid content concentration of the sizing sheet in step (5) is 1-2wt%.

[0020] Optionally, the absolute dry weight of the upper and lower film substrates in step (5) is 12-15 g / m 2 The absolute dry weight of the middle layer base is 20-30g / m 2 .

[0021] Optionally, in step (6), the composite substrate is dried by Yankee drying at a temperature of 120-140°C, and the coated substrate is dried by tunnel convection drying at a temperature of 80-100°C.

[0022] According to a second aspect of the present invention, a powder paper forming process for reconstituted tobacco is provided.

[0023] The powder-paper forming process reconstituted tobacco leaf is prepared by the powder-paper forming process reconstituted tobacco leaf preparation method of the present invention.

[0024] The method for preparing reconstituted tobacco leaves by powder paper forming process provided by the present invention has the following advantages:

[0025] (1) The tobacco powder 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 achieve the effect of improving the coating rate;

[0026] (2) The middle layer of the composite substrate can effectively enhance the strength of the composite substrate, and the upper layer and the lower layer are both made of a short fiber mixture, so that the upper layer and the lower layer have more gaps than the middle layer, which is beneficial to improve the coating rate. DETAILED DESCRIPTION

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] The method for preparing reconstituted tobacco leaves by powder paper forming process provided by the present invention comprises the following steps:

[0032] Step (1): crushing tobacco raw materials into ultrafine powder, extracting the ultrafine powder to obtain tobacco extract and tobacco powder residue.

[0033] Step (1) can be specifically as follows:

[0034] The tobacco raw material is firstly crushed to a particle size of 30-60 meshes, and then refined to a particle size of 200-500 meshes to obtain ultrafine powder, and the ultrafine powder is subjected to extraction treatment to obtain tobacco extract and tobacco powder residue.

[0035] The tobacco powder 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 achieve the effect of improving the coating rate.

[0036] The extraction treatment in step (1) is a water extraction treatment, and the solid-liquid ratio of the water extraction treatment can be 1:7-1:10.

[0037] Step (2): Concentrating the tobacco extract to obtain a concentrated solution.

[0038] Step (3): Add a binder to the tobacco powder residue and mix them evenly 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 the adhesive added is 0.2-1wt%. The amount of the adhesive added is calculated as the mass percentage of the adhesive to the total mass of the ultrafine powder and the pulp board.

[0040] The adhesive can make the subsequent slurry and tobacco powder residue better combined in the papermaking and molding process.

[0041] Step (4): respectively adding the long fiber slurry and the short fiber slurry into the mixture to obtain a long fiber mixture and a short fiber mixture.

[0042] In actual operation, in order to ensure the uniformity of the slurry, the slurry is pumped through the mixing tank, buffer tank and slurry discharge tank in sequence. In order to ensure the uniformity of the slurry, the slurry discharge tank is divided into three layers: upper, middle and lower. Each layer has three slurry discharge pipes, and the three slurry discharge pipes are distributed at 120° on this layer. In addition, the slurry level in the slurry discharge tank must be maintained at 70% or above.

[0043] The long fiber pulp in step (4) is obtained by defibration and pulping of coniferous wood pulp board or hemp pulp board, and the short fiber pulp is obtained by defibration and pulping of hardwood pulp board, and the mass ratio of ultrafine powder to pulp is (84-86):(15-16).

[0044] The above-mentioned slurry refers to the slurry after beating.

[0045] Step (5): papermaking the long fiber mixture to form a middle layer base, and papermaking the short fiber mixture to form an upper layer base and a lower layer base, wherein the middle layer base has a greater absolute dry weight than the upper layer base and the lower layer base.

[0046] The middle layer base in the composite base can effectively enhance the strength of the composite base, and the upper layer base and the lower layer base are both formed by papermaking a short fiber mixture, so that the upper layer base and the lower layer base have more gaps than the middle layer base, which is beneficial to improve the coating rate.

[0047] The solid content concentration of the sizing sheet in step (5) can be 1-2wt%.

[0048] The absolute dry weight of the upper and lower film bases in step (5) is 12-15 g / m 2 The absolute dry weight of the middle layer base is 20-30g / m 2 .

[0049] Step (6): Compounding the upper sheet base, the middle sheet base and the lower sheet base to obtain a composite sheet base, drying the composite sheet base, and applying a coating treatment with the concentrated liquid as a coating liquid and drying the composite sheet base to obtain reconstituted tobacco leaves.

[0050] In step (6), the composite substrate is dried by Yankee drying at a temperature of 120-140°C, and the coated substrate is dried by tunnel convection drying at a temperature of 80-100°C.

[0051] The film base has almost no aromatic substances and is not afraid of high temperature baking. It can be dried in a Yankee cylinder to achieve the effect of high temperature and rapid drying. Tunnel convection drying has a lower temperature than Yankee cylinder drying. Using tunnel convection drying for coated film base can effectively reduce the volatilization of volatile aroma components in the coating liquid.

[0052] 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.

[0053] Example 1

[0054] The tobacco raw material was 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. 500 g of ultrafine powder was prepared and extracted with 65°C water at a solid-liquid ratio of 1:8 for 45 min, and solid-liquid separation was performed with a nylon filter cloth to obtain tobacco extract and tobacco powder residue, and the tobacco powder residue was divided into two parts, A and B, at a mass ratio of A:B=2:1.

[0055] The tobacco extract was concentrated under vacuum at 65°C and 80 mPa to obtain a concentrate with a Brix of 50%.

[0056] 1.57g of tamarind polysaccharide gum as an adhesive was added to tobacco residue A and mixed evenly, and 0.78g of tamarind polysaccharide gum as an adhesive was added to tobacco residue B and mixed evenly. The total amount of tamarind polysaccharide gum added (2.35g) was equivalent to 0.4wt% of the total mass of the ultrafine powder and the slurry (beating degree 45°SR) (588.2g). The tamarind polysaccharide gum was first prepared to a concentration of 1wt% and then added to the tobacco residue.

[0057] The softwood pulp board and the hardwood pulp board were defibrated and beaten to 45°SR. 58.8 g of softwood pulp was mixed with tobacco powder residue A added with tamarind polysaccharide gum to obtain a long fiber pulp mixture C. 29.4 g of hardwood pulp was mixed with tobacco powder residue B added with tamarind polysaccharide gum to obtain a short fiber pulp mixture D.

[0058] The long fiber slurry mixture C is used as the middle layer slurry, and the middle layer sheet base formed by papermaking has an absolute dry basis weight of 30g / m 2 The short fiber slurry mixture D was used as the upper slurry and the lower slurry. The absolute dry weight of the upper and lower sheet bases formed by papermaking was 15 g / m 2.

[0059] The upper base, the middle base and the lower base are mechanically compounded to obtain a composite base, the absolute dry weight of which is 60 g / m 2 .

[0060] The composite sheet base is dried using a Yankee cylinder at a drying temperature of 120-140°C.

[0061] The dried composite sheet base is coated with a concentrated liquid, and the coated sheet base is dried by tunnel convection drying at a drying temperature of 80-100° C., thereby obtaining reconstituted tobacco S1 prepared by a powder paper molding process.

[0062] Example 2

[0063] The tobacco raw material was 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. 500 g of fine powder was prepared and extracted with 65°C water at a solid-liquid ratio of 1:8 for 45 min, and solid-liquid separation was performed with a nylon filter cloth to obtain tobacco extract and tobacco powder residue, and the tobacco powder residue was divided into two parts, A and B, at a mass ratio of A:B=2:1.

[0064] The tobacco extract was concentrated under vacuum at 65°C and 80 mPa to obtain a concentrate with a Brix of 50%.

[0065] 1.57g of guar gum as a binder was added to tobacco residue A and mixed evenly, and 0.78g of guar gum as a binder was added to tobacco residue B and mixed evenly. The total amount of guar gum added (2.35g) was equivalent to 0.4wt% of the total mass of ultrafine powder and slurry (beating degree 45°SR) (588.2g). Guar gum was first prepared to a concentration of 1wt% and then added to tobacco residue.

[0066] The coniferous wood pulp board and the broadleaf wood pulp board were respectively subjected to defibration treatment and beaten to 45° SR. 58.8 g of coniferous wood pulp was mixed with tobacco powder residue A added with guar gum to obtain a long fiber pulp mixture C. 29.4 g of broadleaf wood pulp was mixed with tobacco powder residue B added with guar gum to obtain a short fiber pulp mixture D.

[0067] The long fiber slurry mixture C is used as the middle layer slurry, and the middle layer sheet base formed by papermaking has an absolute dry basis weight of 30g / m 2 The short fiber slurry mixture D was used as the upper slurry and the lower slurry. The absolute dry weight of the upper and lower sheet bases formed by papermaking was 15 g / m 2 .

[0068] The upper base, the middle base and the lower base are mechanically compounded to obtain a composite base, the absolute dry weight of which is 60 g / m 2 .

[0069] The composite sheet base is dried using a Yankee cylinder at a drying temperature of 120-140°C.

[0070] The dried composite sheet base is coated with a concentrated liquid, and the coated sheet base is dried by tunnel convection drying at a drying temperature of 80-100° C., to obtain reconstituted tobacco S2 prepared by a powder paper molding process.

[0071] Comparative Example 1

[0072] 500 g of tobacco raw material was extracted with 65°C water at a solid-liquid ratio of 1:8 for 45 min, and solid-liquid separation was performed with nylon filter cloth to obtain an extract and residue. The tobacco was pulped to obtain a pulp with a beating degree of 45°SR, and 88.2 g of wood pulp with a beating degree of 45°SR (including 58.8 g of coniferous pulp and 29.4 g of broadleaf pulp) was added. The tobacco extract was vacuum concentrated at 65°C and a vacuum degree of 80 mPa to obtain a concentrate with a Brix degree of 50%. After sheeting, an absolute dry weight of 60 g / m 2 The base is dried by a Yankee cylinder at a temperature of 120-140°C. The base is coated with a concentrate having a Brix degree of 50%, and the coated base is dried by tunnel convection drying at a temperature of 80-100°C to obtain conventional reconstituted tobacco leaves D1.

[0073] Comparative Example 2

[0074] 500 g of tobacco raw material was extracted with 65°C water at a solid-liquid ratio of 1:8 for 45 min, and solid-liquid separation was performed with nylon filter cloth to obtain an extract and residue. The tobacco was pulped to obtain a pulp with a beating degree of 45°SR, and 55 g of wood pulp with a beating degree of 45°SR (including 36.7 g of coniferous pulp and 18.3 g of broadleaf pulp) was added. The tobacco extract was vacuum concentrated at 65°C and a vacuum degree of 80 mPa to obtain a concentrate with a Brix degree of 50%. After sheeting, an absolute dry weight of 60 g / m 2 The base is dried by a Yankee cylinder at a temperature of 120-140° C. The base is coated with a concentrate having a Brix degree of 50%, and the coated base is dried by tunnel convection drying at a temperature of 80-100° C. to obtain conventional reconstituted tobacco leaves D2.

[0075] Table 1 Comparison of reconstituted tobacco samples using different processes

[0076]

[0077] 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 leaves by powder paper forming process, characterized in that: The steps include: Step (1): crushing tobacco raw materials into ultrafine powder, extracting the ultrafine powder to obtain tobacco extract and tobacco powder residue; Step (2): concentrating the tobacco extract to obtain a concentrated solution; Step (3): adding a binder to the tobacco powder residue and mixing them evenly to obtain a mixture; Step (4): adding the long fiber slurry and the short fiber slurry to the mixture respectively to obtain a long fiber mixture and a short fiber mixture; Step (5): papermaking the long fiber mixture to form a middle layer base, and papermaking the short fiber mixture to form an upper layer base and a lower layer base, wherein the middle layer base has a greater absolute dry basis weight than the upper layer base and the lower layer base; Step (6): Compounding the upper sheet base, the middle sheet base and the lower sheet base to obtain a composite sheet base, drying the composite sheet base, and applying a coating treatment with the concentrated liquid as a coating liquid and drying the composite sheet base to obtain reconstituted tobacco leaves.

2. The method for preparing reconstituted tobacco using powder paper forming process according to claim 1, characterized in that: The step (1) is specifically as follows: The tobacco raw material is firstly crushed to a particle size of 30-60 meshes, and then refined to a particle size of 200-500 meshes to obtain ultrafine powder, and the ultrafine powder is subjected to extraction treatment to obtain tobacco extract and tobacco powder residue.

3. The method for preparing reconstituted tobacco by powder paper forming process according to claim 1, characterized in that: The extraction treatment in step (1) is a water extraction treatment, and the solid-liquid ratio of the water extraction treatment is 1:7-1:

10.

4. The method for preparing reconstituted tobacco using powder 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 the adhesive added is 0.2-1wt%.

5. The method for preparing reconstituted tobacco by powder paper forming process according to claim 1, characterized in that: The long fiber pulp in step (4) is obtained by defibration and pulping of coniferous wood pulp board or hemp pulp board, and the short fiber pulp is obtained by defibration and pulping of hardwood pulp board, and the mass ratio of ultrafine powder to pulp is (84-86):(15-16).

6. The method for preparing reconstituted tobacco using powder paper forming process according to claim 1, characterized in that: The solid content concentration of the sizing sheet in step (5) is 1-2wt%.

7. The method for preparing reconstituted tobacco using powder paper forming process according to claim 1, characterized in that: The absolute dry weight of the upper and lower film substrates in step (5) is 12-15 g / m 2 The absolute dry weight of the middle layer base is 20-30g / m 2 .

8. The method for preparing reconstituted tobacco using powder paper forming process according to claim 1, characterized in that: In the step (6), the composite substrate is dried by Yankee drying at a temperature of 120-140°C, and the coated substrate is dried by tunnel convection drying at a temperature of 80-100°C.

9. A powder paper forming process for reconstituted tobacco, characterized in that: Prepared by the preparation method described in any one of claims 1 to 8.

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