Preparation method of paper-making reconstituted tobacco substrate

Abstract

The invention belongs to the field of reconstituted tobaccos, and particularly relates to a tobacco substrate and a pulping method of tobacco powder of paper-making reconstituted tobaccos. The pulping method comprises the following steps: 1) crushing a tobacco powder raw material, and separating the crushed tobacco powder raw material into a leaf surface component and a leaf vein component; 2) performing screening and solid-liquid separation on the leaf surface components to obtain tobacco leaf surface pulp; (3) cracking the leaf vein components and the tobacco stems under the action of a disc mill to obtain tobacco stem pulp; 4, the tobacco leaf surface pulp, the tobacco stem pulp, wood pulp and filler are subjected to pulp mixing and papermaking, and the tobacco substrate is obtained.Compared with existing mixed pulping, the method has the advantages that leaf surface components and leaf vein components are crushed, screened and treated respectively, the characteristics of raw materials can be combined, excessive abrasion of a tobacco powder structure in the mixed pulping process can be avoided, and the utilization rate of the raw materials is greatly increased.

Description

Technical Field

[0001] The present invention belongs to the technical field of the preparation of reconstituted tobacco leaves, and particularly relates to a method for preparing a base sheet of reconstituted tobacco leaves by the papermaking method. Background Art

[0002] In the tobacco industry, in order to improve the utilization rate of tobacco leaves and product quality, the technology of reconstituted tobacco leaves has been widely applied. Reconstituted tobacco leaves are tobacco leaf products re-made after processing tobacco leaf fragments, fines, and stem pieces, etc. The direct utilization rate of these tobacco leaf by-products in traditional tobacco products is relatively low, but through the technology of reconstituted tobacco leaves, they can be converted into high-quality tobacco raw materials, thereby improving the resource utilization rate and economic benefits.

[0003] Currently, the pulping process and the papermaking process of reconstituted tobacco leaves by the papermaking method almost completely replicate the papermaking process. In the pulping process, tobacco stems, tobacco fines, and wood pulp are mixed and then mechanically pulped, and the papermaking process is exactly the same as the papermaking process. Tobacco raw materials are essentially different from plant fibers such as wood in terms of chemical composition and physical structure. Especially for tobacco fines raw materials (the shredded fines composed of leaf surfaces and leaf veins), their fiber content is relatively low, and the non-fiber component content is relatively large. Tobacco fines are extremely easy to be over-worn during the mixed pulping process. On the other hand, a large amount of fine components and dissolved substances generated during the mixed pulping will affect the structure and forming process of the sheet base. In addition, the traditional method for preparing reconstituted tobacco leaves often requires multiple complex processes, with a long production cycle and high energy consumption. Therefore, the improvement of the pulping process of tobacco fines for papermaking is crucial for improving the raw material utilization rate and the physical properties of the finished product during the production process of reconstituted tobacco leaves by the papermaking method.

[0004] Therefore, it is of great significance to develop a pulping method for tobacco fines of reconstituted tobacco leaves by the papermaking method that is efficient, low-cost, and can ensure product quality. Summary of the Invention

[0005] The purpose of the present invention is to overcome the shortcomings in the prior art and provide a method for preparing a base sheet of reconstituted tobacco leaves by the papermaking method. This method uses crushing and screening to separately process the leaf surface components and leaf vein components. Compared with the existing mixed pulping, it can combine the characteristics of the raw materials themselves, avoid the excessive wear of the tobacco fines structure during the mixed pulping process, and greatly improve the raw material utilization rate.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions: A method for preparing a base sheet of reconstituted tobacco leaves by the papermaking method, which comprises the following steps: 1) The tobacco fines raw materials are crushed and then separated into leaf surface components and leaf vein components; 2) The leaf surface components are screened, and the components with appropriate sizes are selected and then obtained as tobacco leaf surface pulp after leaching and solid-liquid separation; 3) The leaf vein components and tobacco stems are cracked under the action of a disk refiner to obtain tobacco stem pulp; 4) The tobacco leaf surface pulp obtained in step 2), the tobacco stem pulp obtained in step 3), wood pulp and fillers are mixed and then paper is made, thus obtaining the product.

[0007] Specifically, in step 1), the crushing method of the tobacco dust raw material is dry crushing; the proportion of the components with 20 - 80 meshes after crushing is not less than 60%; preferably, the dry crushing uses one or more combinations of a hammer crusher, a roll crusher, a counter - impact crusher, an impact crusher, etc., and preferably, it is crushed by a hammer crusher.

[0008] Furthermore, in step 1), the separation method is air screening, and the leaf surface components and the leaf vein components are separated according to the density difference between them.

[0009] Furthermore, the specific steps of step 2) are as follows: the leaf surface components are screened by a dry vibrating screen and a mesh, and the components with more than 40 meshes are selected. After leaching and solid - liquid separation, a solid with a certain concentration is obtained as the tobacco leaf surface pulp; the components with less than 40 meshes are sent back to the crushing section for re - crushing; Preferably, the solid - liquid ratio of the leaching process is 1 kg∶(2 - 8) L, preferably 1:4, the temperature is 40 - 75 °C, the time is 0.5 - 3 h, and the leaching liquid is water; the solid - liquid separation method is one or more of a single - screw pulp extruder, a double - screw pulp extruder, a belt filter press, and a plate - and - frame filter press, and the concentration of the solid is 20 - 45%.

[0010] Specifically, in step 3), the mass ratio of the leaf vein components to the tobacco stems is 1∶(2 - 10), preferably 1∶8; the process of the disk refiner is as follows: after the mixture of the leaf vein components and the tobacco stems is leached and solid - liquid separated, the concentration of the obtained solid is 20 - 45%; a high - consistency refiner is used for the first - stage refining, and the refining concentration is 20 - 35%, preferably 30%; after refining, the raw material concentration is adjusted to 8 - 18%, preferably 15%, and a disk refiner is used for the second - stage refining to obtain a tobacco stem pulp with a beating degree of 15 - 23 o SR. Preferably, the solid - liquid ratio of the leaching process can be 1 kg∶(2 - 8) L, the temperature is 40 - 75 °C, the time is 0.5 - 3 h; the leaching liquid is water; the solid - liquid separation method is one or more of a single - screw pulp extruder, a double - screw pulp extruder, a belt filter press, and a plate - and - frame filter press.

[0011] Furthermore, the specific steps of step 4) are that the tobacco leaf surface pulp, the tobacco stem pulp, wood pulp and fillers are mixed and then a reconstituted tobacco base sheet is made through a paper - making machine.

[0012] Preferably, the wood pulp in step 4) can be one or a combination of two of bleached softwood pulp, bleached hardwood pulp, etc.; the mass ratio of the wood pulp to the tobacco dust raw material is (0.1 - 0.3)∶1.

[0013] Preferably, the filler described in step 4) can be precipitated calcium carbonate PCC, etc.; the mass ratio of the filler to the tobacco dust raw material is (0.1 - 0.3)∶1.

[0014] The present invention provides a reconstituted tobacco substrate prepared by the above method.

[0015] Compared with the prior art, the advantages and beneficial effects of the method of the present invention are as follows: 1) By adopting crushing and screening, the leaf surface components and vein components are treated separately. Compared with the existing mixed pulping, it can combine the characteristics of the raw materials, avoid excessive wear of the tobacco dust structure during the mixed grinding process, and greatly improve the utilization rate of the raw materials.

[0016] 2) After the leaf surface components are crushed and dry-screened, and the vein components are ground / pore-screened and classified, tobacco dust raw materials with uniform size can be obtained, which can not only maintain the structure of the leaf surface components but also grind the particulate matter in the vein components into pulp.

[0017] 3) The content of fine components in the leaf surface components obtained by shredding and screening classification is low, and the content of dissolved substances is small, so that the efficiency of the retention aid in the papermaking process can be improved.

[0018] 4) The vein components are mixed and ground with tobacco stems, which can combine their structural characteristics, grind to the required degree of production, the grinding process is easy to control, the treatment degree of tobacco stems and vein components after grinding is uniform, the content of fine components generated by grinding is small, and the damage degree of the tobacco stem structure by grinding is light. The tobacco stem pulp prepared by this process can improve the bulkiness of the product. Description of the Drawings

[0019] Figure 1 It is a flow schematic diagram of a method for pulping tobacco dust for reconstituted tobacco by papermaking method; Figure 2 It is a scanning electron micrograph of the tobacco pulp prepared in Comparative Example 1; it can be seen from the figure that after the tobacco stems, tobacco dust and wood pulp are mixed and ground, the structures of the tobacco stems and tobacco dust are severely fragmented, and a large number of fine particles are generated during grinding; Figure 3 It is a scanning electron micrograph of the tobacco leaf surface pulp prepared in Example 1; it can be seen from the figure that for the tobacco leaf surface pulp prepared by the method of the present invention, the leaf surface components are shredded into a certain size, the damage degree of the tobacco leaf surface structure is relatively low, and the content of fine particles is less; Figure 4 It is a scanning electron micrograph of the tobacco stem pulp prepared in Example 1; it can be seen from the figure that after the tobacco stems and vein components are ground, the wear degree of the raw material structure is relatively low, the tobacco pulp fibers have a certain aspect ratio, and the content of fine components generated by grinding is less. Specific Embodiments

[0020] To enable those skilled in the art of the present technology to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and the best embodiments. However, the protection scope of the present invention is not limited thereto.

[0021] Comparative Example 1 Referring to the existing pulping process of tobacco base sheets in a certain papermaking method for reconstituted tobacco in Henan, 24.8 kg of tobacco stems, 20 kg of tobacco dust raw materials (including leaf surface components and vein components), and 2.29 kg of wood pulp were mixed, and tobacco pulp was prepared through leaching, screw pressing, and two-stage low-concentration refining. The beating degree of the tobacco pulp was 25 o SR, and the morphology was as Figure 2 shown.

[0022] During the papermaking process of the comparative example, 2.29 kg of precipitated calcium carbonate PCC was added as a filler, and 0.1% guar gum was added as a retention aid. The basis weight of the paper made was 60 g / m 2 of tobacco base sheets. In the existing process of mixed pulping, the content of fine components (>200 mesh components) in the tobacco pulp (>25%) and the content of dissolved substances in the pulp (>5%) were relatively high. The bulk density of the paper-made tobacco base sheets was 2.65 g / cm 3 .

[0023] Example 1 A preparation method for the base sheet of reconstituted tobacco by papermaking method (the process is as Figure 1 shown), and the following steps are adopted: 1) Take 20.0 kg of tobacco dust raw materials, dry-crush them with a hammer crusher, and then obtain 16.5 kg of leaf surface components and 3.1 kg of vein components after screening with a pneumatic screening machine; The pneumatic screening equipment is preferably a multi-flow composite air classifier of Beijing Aerospace Wanyuan Technology Co., Ltd., which can separate the components with a leaf surface component content of more than 80% from the vein components of the tobacco dust at one time; 2) Use a dry vibrating screen to screen the leaf surface components, select a 40-mesh screen, and the components passing through the screen enter the leaching section of the tobacco dust raw materials. The components intercepted by the screen are sent back to the hammer crusher for re-crushing and screening until all components pass through the 40-mesh screen; 3) A total of 15.6 kg of leaf surface components above 40 meshes obtained after screening are soaked in 62 L of clear water at 70 o °C for 30 min, and then a belt filter is used to separate the solid and liquid of the tobacco dust to obtain 32.81 kg of a solid component with a concentration of 32% as tobacco leaf surface pulp, and the morphology is as Figure 3 shown, and it is transported to the pulp mixing tank for subsequent pulp mixing, and the liquid substance is transported to the extraction liquid concentration area; 4) Mix 3.1 kg of the vein components obtained by air separation with 24.8 kg of tobacco stems, add 140 L of clear water, and at 70 oSoak for 60 min at C temperature, and then a single-screw extruder separates the solid and liquid of the mixture to obtain 35.4 kg of solids with a concentration of 35%. Adjust the solids to a concentration of 30%, and use a high-concentration refiner for the first-stage refining; after refining, adjust the raw material concentration to 15%, and use a disk refiner for the second-stage refining to obtain a beating degree of 18 o SR tobacco stem pulp, with a morphology as Figure 4 shown.

[0024] Mix the tobacco leaf surface pulp and tobacco stem pulp prepared above with 2.29 kg of bleached softwood pulp and 2.29 kg of filler PCC to obtain tobacco pulp, and use a paper machine to make a tobacco base sheet with a basis weight of 60 g / m 2 The bulk density of the obtained tobacco base sheet is significantly improved compared with Comparative Example 1, and can reach 3.04 g / cm 3 . The tobacco base sheet prepared by this method has a uniform size distribution, the proportion of components with 40-120 mesh reaches 87%, and the morphology remains intact. The content of fine components (>200 mesh components) (19%) and the content of dissolved substances (4.5%) in the configured tobacco pulp can be greatly reduced.

[0025] Example 2 The preparation method of the reconstituted tobacco leaf base sheet by the papermaking method is only different from that of Example 1 in that the type and dosage of the finally added wood pulp are different. Mix the tobacco leaf surface pulp and tobacco stem pulp prepared above with 4.58 kg of bleached hardwood pulp and 2.29 kg of filler PCC, and use a paper machine to make a tobacco base sheet with a basis weight of 60 g / m 2 The bulk density of the obtained tobacco base sheet is 3.18 g / cm 3 .

[0026] Example 3 The preparation method of the reconstituted tobacco leaf base sheet by the papermaking method is only different from that of Example 1 in that the finally added amount of PCC is different. Mix the tobacco leaf surface pulp and tobacco stem pulp prepared above with 2.29 kg of bleached hardwood pulp and 4.58 kg of PCC, and use a paper machine to make a tobacco base sheet with a basis weight of 60 g / m 2 The bulk density of the obtained tobacco base sheet is 3.18 g / cm 3 .

[0027] Example 4 The preparation method of the reconstituted tobacco leaf base sheet by the papermaking method adopts the following steps: 1) Take 30.0 kg of tobacco dust raw materials, dry-crush them with a hammer crusher, and then screen them with a pneumatic sieve to obtain 26 kg of leaf surface components and 3.0 kg of vein components; the pneumatic screening equipment is preferably the multi-directional composite air classifier of Beijing Aerospace Wanyuan Technology Co., Ltd., which can separate more than 80% of the leaf surface components from the vein components of the tobacco dust at one time; 2) Use a dry vibrating screen to screen the leaf surface components, and select a 40-mesh sieve; the components passing through the sieve enter the leaching section of the tobacco dust raw material, and the components intercepted by the sieve are sent back to the hammer crusher for re-crushing and screening until all components pass through the 40-mesh sieve; 3) The total amount of leaf surface components above 40 meshes obtained after screening is 25.0 kg. Use 100 L of clear water to soak at 70 o °C for 30 min, and then use a single-screw pulp extruder to separate the solid and liquid of the tobacco dust to obtain 58 kg of solid components with a concentration of 30% as tobacco leaf surface pulp, and transport it to the pulp mixing tank for subsequent pulp mixing, and transport the liquid substance to the extract concentrate; 4) Mix 3.0 kg of the vein components obtained by air separation with 24.0 kg of tobacco stems, add 100 L of clear water, and soak at 70 o °C for 60 min, and then use a double-screw pulp extruder to separate the solid and liquid of the mixture to obtain 32.5 kg of solid components with a concentration of 36%. Adjust the solid components to a concentration of 30%, and use a high-concentration refiner for the first-stage refining; after refining, adjust the raw material concentration to 15%, and use a disk refiner for the second-stage refining to obtain tobacco stem pulp with a beating degree of 20 o °SR; Mix the above-prepared tobacco leaf surface pulp, tobacco stem pulp with 3.0 kg of bleached broadleaf wood pulp and 3.0 kg of filler PCC, and use a paper former to form a tobacco base sheet with a basis weight of 58 g / m 2 . The bulk density of the obtained tobacco base sheet is 3.23 g / cm 3 . By preparing the leaf surface pulp by this method, the size distribution is uniform, and the proportion of components with 60-120 meshes reaches 91%.

[0028] Example 5 The preparation method of the reconstituted tobacco leaf base sheet by the papermaking method is only different from that of Example 4 in that the refining concentration of the tobacco stem pulp is different. Among them, the first-stage refining concentration is 35%, and the second-stage refining concentration is 18%, and the beating degree of the obtained tobacco stem pulp is 25 o °SR. Mix the above-prepared tobacco leaf surface pulp, tobacco stem pulp, 3.0 kg of bleached broadleaf wood pulp and 3.0 kg of filler PCC, and use a paper former to form a tobacco base sheet with a basis weight of 58 g / m 2 . The bulk density of the obtained tobacco base sheet is 3.10 g / cm 3 . By preparing the leaf surface pulp by this method, the size distribution is uniform, and the proportion of components with 60-120 meshes reaches 91%.

[0029] Example 6 The preparation method of the reconstituted tobacco leaf base sheet by the papermaking method is only different from that of Example 4 in that the refining concentration of the tobacco stem pulp is different. Among them, the first-stage refining concentration is 20%, and the second-stage refining concentration is 8%, and the beating degree of the obtained tobacco stem pulp is 20 oSR. Mix the tobacco leaf surface pulp, tobacco stem pulp, 3.0 kg of bleached hardwood pulp, and 3.0 kg of filler PCC prepared above, and use a paper making machine to make a tobacco base sheet with a basis weight of 58 g / m 2 The bulk density of the obtained tobacco base sheet is 3.15 g / cm 3 . By using this method to prepare the leaf surface pulp, the size distribution is uniform, and the proportion of the 60 - 120 mesh component reaches 91%.

[0030] Example 7 The preparation method of the reconstructed tobacco leaf base sheet by the papermaking method is only different from that of Example 4 in the crushing method of the tobacco dust raw material: Take 50.0 kg of tobacco dust raw material, crush it with a counter - impact crusher, and after screening with a pneumatic sieve, 40.0 kg of leaf surface components and 10.0 kg of vein components are obtained; Treat the leaf surface components according to the treatment method of Example 4, and make a slurry in the same proportion, and use a paper making machine to make a tobacco base sheet with a basis weight of 60 g / m 2 The bulk density of the obtained tobacco base sheet is 3.05 g / cm 3 . By using this method to prepare the leaf surface pulp, the size distribution is uniform, and the proportion of the 60 - 120 mesh component reaches 93%.

[0031] Example 8 The preparation method of the tobacco dust for the reconstructed tobacco leaf by the papermaking method is only different from that of Example 4 in the crushing method of the tobacco dust raw material: Take 50.0 kg of tobacco dust raw material, crush it with an impact crusher, and after screening with a pneumatic sieve, 42.0 kg of leaf surface components and 8.0 kg of vein components are obtained; Treat the leaf surface components according to the treatment method of Example 4, and make a slurry in the same proportion, and use a paper making machine to make a tobacco base sheet with a basis weight of 60 g / m 2 The bulk density of the obtained tobacco base sheet is 2.98 g / cm 3 . By using this method to prepare the leaf surface pulp, the size distribution is uniform, and the proportion of the 60 - 120 mesh component reaches 87%.

[0032] Example 9 The preparation method of the reconstructed tobacco leaf base sheet by the papermaking method adopts the following steps: 1) Take 100.0 kg of tobacco dust raw material, crush it dry with a hammer crusher, and after screening with a pneumatic sieve, 84.0 kg of leaf surface components and 15.0 kg of vein components are obtained. The pneumatic screening equipment is preferably the multi - flow composite air classifier of Beijing Aerospace Wanyuan Technology Co., Ltd., which can separate the components with more than 80% of the tobacco leaf surface components from the vein components at one time; 2) Use a dry vibrating screen to screen the leaf surface components. Select a 40-mesh sieve. The components passing through the sieve enter the leaching section of the tobacco dust raw material, and the components intercepted by the sieve are sent back to the hammer crusher for re-crushing and screening until all components pass through the 40-mesh sieve; 3) The total amount of leaf surface components above 40 mesh obtained after screening is 83.0 kg. Use 332 L of clear water and soak at 60 o °C for 30 min. Then use a plate and frame filter press to separate the solid and liquid of the tobacco dust, obtaining 143 kg of solid components with a concentration of 35% as tobacco leaf surface pulp, and transporting it to the pulp mixing tank for subsequent pulp mixing. The liquid substance is transported to the extraction liquid concentration area; 4) Mix 15.0 kg of vein components obtained by air separation with 68.0 kg of tobacco stems, add 332 L of clear water, and soak at 60 o °C for 60 min. Then use a plate and frame filter press to separate the solid and liquid of the mixture, obtaining 143.0 kg of solid components with a concentration of 35%. Adjust the solid components to a concentration of 30%, and use a high-concentration refiner for the first-stage refining; after refining, adjust the raw material concentration to 15%, and use a disk refiner for the second-stage refining to obtain tobacco stem pulp with a beating degree of 23 o °SR; Mix the above-prepared tobacco leaf surface pulp, tobacco stem pulp with 7.5 kg of bleached broadleaf wood pulp, 7.5 kg of bleached softwood pulp, and 10.0 kg of filler PCC, and use a paper former to form a tobacco base sheet with a basis weight of 60 g / m 2 , and the bulk density of the obtained tobacco base sheet is 3.21 g / cm 3 .

[0033] Example 10: The preparation method of the reconstituted tobacco leaf base sheet by the papermaking method is only different from that of Example 9 in that: the solid-liquid ratio during the leaching of the leaf surface components after screening, and the solid-liquid ratio during the leaching of the vein components and tobacco stems are different: among them, the solid-liquid ratio during the leaching of the leaf surface components, and the solid-liquid ratio during the leaching of the vein components and tobacco stems are both 1:2. After leaching, the raw materials are mixed into pulp according to the same treatment process and ratio, and a tobacco base sheet with a basis weight of 60 g / m 2 is formed by a paper former, and the bulk density of the obtained tobacco base sheet is 3.16 g / cm 3 .

[0034] Example 11: The preparation method of the reconstituted tobacco leaf base sheet by the papermaking method is only different from that of Example 9 in that: the solid-liquid ratio during the leaching of the leaf surface components after screening, and the solid-liquid ratio during the leaching of the vein components and tobacco stems are different: among them, the solid-liquid ratio during the leaching of the leaf surface components, and the solid-liquid ratio during the leaching of the vein components and tobacco stems are both 1:8. After leaching, the raw materials are mixed into pulp according to the same treatment process and ratio, and a tobacco base sheet with a basis weight of 60 g / m 2The tobacco base sheet obtained has a bulk density of 3.14 g / cm 3 .

[0035] Example 12: The preparation method of the reconstructed tobacco leaf base sheet by the papermaking method is only different from that of Example 9 in that: after screening, the ratio of the vein component to the tobacco stem is different. 15.0 kg of vein component is mixed with 30.0 kg of tobacco stem. After leaching, the raw materials are pulped according to the same processing technology and ratio, and are formed into a tobacco base sheet with a basis weight of 60 g / m 2 The tobacco base sheet obtained has a bulk density of 3.30 g / cm 3 .

[0036] Example 13: The preparation method of the reconstructed tobacco leaf base sheet by the papermaking method is only different from that of Example 9 in that: after screening, the ratio of the vein component to the tobacco stem is different. 15.0 kg of vein component is mixed with 150.0 kg of tobacco stem. After leaching, the raw materials are pulped according to the same processing technology and ratio, and are formed into a tobacco base sheet with a basis weight of 60 g / m 2 The tobacco base sheet obtained has a bulk density of 2.85 g / cm 3 .

[0037] In summary, the method of the present invention has the following advantages and beneficial effects: 1. By using crushing and screening to separately process the leaf surface component and the vein component, compared with the existing mixed pulping, it can combine the characteristics of the raw materials, avoid excessive wear of the tobacco dust structure during the mixed grinding process, and greatly improve the utilization rate of the raw materials.

[0038] 2. After the leaf surface component is crushed, dry-screened, and the vein component is ground / pore-screened and classified, tobacco dust raw materials with uniform size can be obtained, which can not only maintain the structure of the leaf surface component but also grind the particulate matter in the vein component into pulp.

[0039] 3. The content of fine components in the leaf surface component obtained by shredding and screening classification is low, and the content of dissolved substances is small, so that the efficiency of the retention aid in the papermaking process can be improved.

[0040] 4. The vein component and the tobacco stem are mixed and ground, which can combine their structural characteristics, grind to the required degree for production, the grinding process is easy to control, the treatment degree of the tobacco stem and the vein component after grinding is uniform, the fine components generated by grinding are few, and the damage degree of the grinding to the structure of the tobacco stem is light. The tobacco stem pulp prepared by this process can play a role in improving the bulk density of the product.

[0041] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A preparation method of a reconstituted tobacco substrate by the papermaking method, characterized in that, It includes the following steps: 1) After crushing the tobacco dust raw material, it is separated into a leaf surface component and a leaf vein component; 2) The leaf surface component is screened, and the component with a suitable size is selected and subjected to leaching and solid-liquid separation to obtain tobacco leaf surface pulp; 3) The leaf vein component and the tobacco stem are cracked under the action of a disk refiner to obtain tobacco stem pulp; 4) The tobacco leaf surface pulp obtained in step 2), the tobacco stem pulp obtained in step 3), wood pulp and filler are mixed and paper-made to obtain the desired product.

2. The preparation method of the reconstituted tobacco substrate by the papermaking method according to claim 1, characterized in that, In step 1), the crushing method of the tobacco dust raw material is dry crushing; the proportion of the 20-80 mesh component after crushing is not less than 60%; the dry crushing uses one or a combination of a hammer crusher, a roll crusher, a counterattack crusher and an impact crusher.

3. The preparation method of the reconstituted tobacco substrate by the papermaking method according to claim 1, characterized in that, In step 1), the separation method is air screening, and the two are separated according to the density difference between the leaf surface component and the leaf vein component.

4. The preparation method of the paper-making reconstituted tobacco substrate according to claim 1, characterized in that, The specific steps of step 2) are: the leaf surface component is screened by a dry vibrating screen and a mesh, and the component above 40 mesh is selected and subjected to leaching and solid-liquid separation to obtain a solid with a certain concentration as tobacco leaf surface pulp; the component less than 40 mesh is sent back to the crushing section for re-crushing; The solid-liquid ratio of the leaching process is 1 kg∶(2-8) L, the temperature is 40-75 °C, the time is 0.5-3 h, and the leaching liquid is water; the solid-liquid separation method is one or a combination of a single-screw pulp press, a double-screw pulp press, a belt filter press and a plate-and-frame filter press, and the concentration of the solid is 20-45%.

5. The preparation method of the reconstituted tobacco substrate by the papermaking method according to claim 1, characterized in that, Step 3) The mass ratio of the vein component to the tobacco stem is 1∶(2 - 10); The process of the disk refiner is as follows: after the mixture of the vein component and the tobacco stem is leached and solid-liquid separated, the concentration of the obtained solid is 20 - 45%; Use a high-concentration refiner for the first-stage refining, where the refining concentration is 20 - 35%; After refining, the raw material concentration is adjusted to 8 - 18%, and use a disk refiner for the second-stage refining to obtain a beating degree of 15 - 23 o Tobacco stem pulp with o The solid-liquid ratio of the leaching process is 1 kg∶(2-8) L, the temperature is 40-75 °C, the time is 0.5-3 h; the leaching liquid is water; the solid-liquid separation method is one or a combination of a single-screw pulp press, a double-screw pulp press, a belt filter press and a plate-and-frame filter press.

6. The preparation method of the reconstituted tobacco substrate by the papermaking method according to claim 1, characterized in that, The specific steps of step 4) are that the tobacco leaf surface pulp, the tobacco stem pulp, wood pulp and filler are mixed and paper-made by a paper-making machine to obtain a reconstituted tobacco base sheet.

7. The preparation method of the paper-making reconstituted tobacco substrate according to claim 6, characterized in that, The wood pulp described in step 4) is one or a combination of bleached softwood pulp and bleached hardwood pulp; the mass ratio of the wood pulp to the tobacco dust raw material is (0.1-0.3)∶1.

8. The preparation method of the paper-making reconstituted tobacco substrate according to claim 6, characterized in that, The filler described in step 4) is precipitated calcium carbonate PCC; the mass ratio of the filler to the tobacco dust raw material is (0.1-0.3)∶1.

9. A reconstituted tobacco base sheet prepared by the method according to any one of claims 1 to 8.

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