Preparation method of high-strength polylactic acid paper-based filter material with flavoring type based on reconstituted tobacco process

Abstract

This invention belongs to the field of cigarette filter manufacturing technology, specifically relating to a method for preparing a flavor-enhancing, high-strength polylactic acid (PLA) paper-based filter material based on a roll-pressing reconstituted tobacco leaf process. The method involves preparing a wet base material by mixing polylactic acid fibers, flavorings, wood pulp fibers, and thickeners in a predetermined ratio; applying a predetermined ratio of carbonate-amino acid composite solution to the tobacco raw material, followed by high-temperature extrusion and pulverization into tobacco powder of a specific mesh size; mixing the wet base material and tobacco powder in a predetermined ratio, then hot-pressing the mixture with hot rollers to fully bond the polylactic acid fibers and plant fibers; and finally, hot-air drying to form a dense, high-strength PLA composite base paper. Composite filter rods processed using this PLA composite base paper can significantly overcome the low adsorption efficiency of heavy paper-based filter materials and the low strength of traditional composite paper-based filter materials. Furthermore, coating can enhance the aroma and physiological satisfaction of low-tar cigarettes, compensating for the lack of sensory enjoyment in low-tar cigarettes.

Description

Technical Field

[0001] This invention belongs to the field of cigarette filter material technology, specifically relating to a method for preparing a flavor-enhancing high-strength polylactic acid paper-based filter material based on a roll-pressing reconstituted tobacco leaf process. Background Technology

[0002] With consumers becoming increasingly health-conscious, low-tar cigarettes have become an important development direction for the tobacco industry. However, reducing tar release is often accompanied by a significant decrease in cigarette aroma and sensory satisfaction, which severely restricts the market acceptance of low-tar cigarettes.

[0003] Traditional filter materials and structures have limitations in reducing tar content in cigarettes. Therefore, developing new, highly efficient filter materials has become a core task in achieving tar reduction in cigarettes. Currently, there are many types of filter materials on the market, such as cellulose acetate and polypropylene fibers. However, these traditional filter materials have varying degrees of problems in terms of adsorption efficiency, strength, and cost. For example, while cellulose acetate filter materials have a certain filtration effect, they are expensive and have a significant environmental impact; polypropylene fiber filter materials suffer from low adsorption efficiency and unstable filtration performance. Paper-based filter materials have received widespread attention due to their low cost and good environmental performance, but they also face challenges such as insufficient adsorption efficiency and relatively low strength. Polylactic acid (PLA) membrane materials have become increasingly popular in recent years due to their excellent film-forming properties, making them suitable for use in composite cigarette filter rods. However, this popularity has also revealed some drawbacks. For example, while PLA fiber filter materials are widely used and offer excellent adsorption efficiency for harmful substances, their price is significantly higher than that of plant fiber-based filter materials. Furthermore, they struggle to meet the requirements for further reducing the release of tar and other harmful substances. Ordinary paper filter materials, while lower in cost, suffer from limitations such as limited functionality, fragility, and low adsorption efficiency. These issues can lead to quality problems during processing and use, impacting cigarette production and quality. In addition, traditional filter materials are less effective at compensating for the lack of sensory enjoyment in low-tar cigarettes.

[0004] Polylactic acid (PLA), as a biodegradable polyester material, has been attempted for use in cigarette filter rods, such as in the production of PLA tow (CN200710055310.3), PLA nonwoven fabric (CN202410259627.2), or blends with other resins (CN202311136401.5). However, these solutions have the following limitations: (1) Pure PLA or PLA-based filter materials are expensive; (2) Pure PLA or PLA-based filter materials are easily deformed by heat and have poor filtration efficiency; (3) They have a single function, mainly focusing on physical filtration or cooling, and lack the ability to actively compensate for the sensory quality of low-tar cigarettes.

[0005] Therefore, there is an urgent need in this field to develop a new type of filter material that can combine the advantages of low cost, easy processing and environmental friendliness of paper-based materials with high strength and high filtration efficiency through structural design, while also actively improving the smoking quality of low-tar cigarettes. Summary of the Invention

[0006] The primary objective of this invention is to provide a method for preparing a flavor-enhancing high-strength polylactic acid paper-based filter material based on a roll-pressing reconstituted tobacco leaf process. This method is simple, low-cost, and easy to industrialize.

[0007] A second objective of the present invention is to provide a paper-based composite filter material prepared by the above method, which has high mechanical strength, high filtration efficiency and active fragrance replenishment function.

[0008] A third objective of the present invention is to provide a composite filter rod and cigarette containing the above-mentioned filter material, which can effectively compensate for the lack of sensory enjoyment while significantly reducing the release of tar and nicotine.

[0009] To achieve the above objectives, this application adopts the following technical solution:

[0010] A method for preparing a flavor-enhancing high-strength polylactic acid paper-based filter material based on a roll-pressing reconstituted tobacco leaf process includes the following steps:

[0011] S1. The added fibers, polylactic acid fibers and fragrances are configured into a wet material component according to the set parameters;

[0012] S2. Process the tobacco raw materials to increase the types and content of aroma substances in the tobacco raw materials to obtain dry material components;

[0013] S3. The aforementioned wet material components and dry material components are uniformly mixed to obtain a mixture, and the moisture content of the mixture is controlled at 30-40%.

[0014] S4. The aforementioned mixture is subjected to 3-5 stages of roller pressing, wherein the 2nd and 3rd stages of roller pressing are equipped with a heating device to obtain a sheet base. Specifically, the dry and wet materials are subjected to 3-5 stages of roller pressing, and the thickness of the sheet base after roller pressing is controlled at (0.1-0.2) mm; wherein the 2nd and 3rd stages of roller pressing are equipped with a heating device, and the roller temperature is adjustable and controllable at (100-160) ℃; preferably, the temperature adopts a step-by-step increasing mode, for example, the first stage roller pressing temperature is set to 100 ℃, the second stage roller pressing temperature is set to 120 ℃, and the third stage roller pressing temperature is set to 130 ℃.

[0015] S5. The aforementioned sheet base is dried, and the moisture content of the dried sheet base is 8-11%, thus obtaining polylactic acid paper-based filter material.

[0016] Furthermore, in step S1, the specific steps for configuring the added fibers, polylactic acid fibers, and fragrances into a wet mixture according to the set parameters are as follows:

[0017] S11. Hydraulically pulping with added fiber to obtain added fiber pulp;

[0018] S12. Add polylactic acid fiber to the aforementioned added fiber slurry at a ratio of 5%-50% of the added fiber mass, and mix evenly to obtain a mixed slurry;

[0019] S13. Add the fragrance to the aforementioned mixed slurry according to the set mass ratio and mix thoroughly to obtain the wet component. Mix the fragrance at a ratio of 25:1 to 100:1 (mass ratio of the slurry prepared in the above steps) to prepare the wet component. The concentrate and fragrance are thoroughly mixed to ensure that the concentration, viscosity, and other indicators of the wet component meet the process requirements.

[0020] Furthermore, in step S11, the hydraulic pulping process is as follows: water is added first, then fiberboard is added, and a dispersant is added during the stirring and pulping process. After the dispersant is added, pulping begins. The mass ratio of water to added fiber is 25:1-10:1, the mass of the applied dispersant relative to water is 0.1-0.5%, and the pulping time is at least 10 minutes.

[0021] Furthermore, the dispersant is one or more of sodium carboxymethyl cellulose, hydroxypropyl cellulose, methyl cellulose, hydroxypropyl methyl cellulose, hydroxypropyl guar gum, and polyacrylamide.

[0022] Furthermore, in step S12, the polylactic acid fiber has a length of 0.5-6.0 mm and a linear density of 1.5-3.5 dtex. It is stirred at 1000-1500 rpm for 20-30 minutes using a high-speed stirring device to ensure that the PLA fiber is evenly dispersed and avoids agglomeration.

[0023] Furthermore, in step 2, the raw tobacco leaves are processed to increase the types and content of aroma substances, and the specific steps to obtain the dry component are as follows:

[0024] S21. Prepare a carbonate-amino acid mixed aqueous solution and apply it evenly to the tobacco raw material; the amount of the carbonate-amino acid mixed aqueous solution applied is 3~10 g of mixed aqueous solution per 100 g of tobacco raw material;

[0025] S22. The tobacco raw material after adding the ingredients is heated to a moisture content of 6-8%; the drying temperature is 40-60℃, and the material is dried to a moisture content of 3-8%. The drying process can be supplemented by measures such as blowing air, stirring, and vibration.

[0026] S23. The tobacco raw material after feeding is subjected to extrusion and puffing treatment to obtain processed tobacco raw material; the extrusion treatment adopts a twin-screw extrusion and puffing equipment, the screw speed of the twin-screw extrusion and puffing equipment is 2~8 pm; the temperature of the feeding section is 60~90℃, the temperature of the transition section is 80~120℃, and the temperature of the die head section is 110~150℃.

[0027] S24. Crush the heat-treated tobacco leaves to a mesh size of 80-300 mesh.

[0028] Furthermore, in step S2, the tobacco raw material is a single-material tobacco or leaf blend formulation composed of tobacco leaves, shredded tobacco, or tobacco dust.

[0029] Furthermore, in step S21, the carbonate is one or a mixture of sodium carbonate and potassium carbonate; the amino acid is one or a mixture of several of alanine, glycine, phenylalanine, arginine, lysine, valine, and proline.

[0030] Furthermore, in step S21, the mass ratio of carbonate to amino acid in the carbonate-amino acid mixed aqueous solution is 1:10~20.

[0031] Furthermore, in step S3, the dry-wet material mixing ratio is 50:15~20; the mixing equipment is a high-speed mixer, the dry-wet material mixing ratio is 50:15~20, and the moisture content of the mixed material is controlled at (30-40)%.

[0032] This application also includes cutting the hot-air dried sheet into sheet bases of a certain width and rolling them into reels, with a width of (20-160) mm.

[0033] The fragrance-enhancing high-strength polylactic acid paper-based filter material of this application uses wood pulp fiber as the matrix and PLA short fiber as the reinforcement, forming a unique three-dimensional network structure through hot pressing; and the structure is internally loaded with tobacco extract concentrate and / or fragrance. Its longitudinal tensile strength is not less than 2.11 kN / m, and its porosity is between 3% and 10%.

[0034] This application provides a flavor-enhancing composite filter rod, wherein at least one filter section is made of the aforementioned paper-based composite filter material. The filter rod is formed using a paper-based filter rod forming machine, representing a mature technology in the industry.

[0035] This application provides a cigarette whose filter tip comprises the above-mentioned paper-based composite filter material or the above-mentioned low-tar composite filter rod.

[0036] This application provides the aforementioned paper-based composite filter material, which can improve the sensory quality of low-tar cigarettes and / or reduce the release of tar and nicotine in the smoke.

[0037] The beneficial effects of this invention are:

[0038] This invention creatively introduces PLA short fibers as a functional reinforcement into wood pulp paper matrix, and forms a three-dimensional network structure of "wood pulp matrix - PLA reinforcing fiber" through hot pressing. This utilizes both the excellent adsorption and thermoplasticity of PLA material and the cost advantage of wood pulp fiber, achieving a synergistic effect of 1+1>2.

[0039] This invention uses a hot-pressing process to firmly bond PLA fibers and wood pulp fibers, increasing the tensile strength of the filter material by 30%-50% compared to traditional thin sheets.

[0040] This invention increases the contact area and path with flue gas by precisely controlling the pore structure (15%-20%) and filter rod porosity (15%-40%) through hot pressing, resulting in high tar and nicotine retention efficiency and a reduction rate of over 30%.

[0041] This invention loads flavor substances directly into the filter material, allowing for precise release during inhalation. This effectively compensates for aroma loss caused by tar reduction, significantly enhancing the physiological satisfaction and sensory comfort of low-tar cigarettes.

[0042] This invention applies a carbonate-amino acid mixed aqueous solution to tobacco raw materials. Firstly, the carbonate increases the solubility of amino acids in water, thereby improving the ease and uniformity of addition. Secondly, the carbonate increases the pH of the tobacco raw material system, promoting the release of nicotine during subsequent processing and reducing nicotine content. Thirdly, heat drying reduces the moisture content of the tobacco raw materials, contributing to increased reaction rates during subsequent processing. Finally, the high temperature and pressure of extrusion puffing promotes the degradation of macromolecules, and the resulting small-molecule sugars undergo Maillard reactions with nitrogen-containing compounds, enhancing the aroma and improving the aroma quality of the tobacco raw materials. The tobacco extract obtained using this method can be added to heated tobacco shreds, sheets, or granules for cigarettes. Compared to extracts prepared from untreated tobacco raw materials, the aroma quality and richness are significantly increased, while off-flavors and irritation are significantly reduced.

[0043] The core process of this invention is a mature wet papermaking technology, which is easy to industrialize and has a cost far lower than that of pure PLA filter media. All raw materials are biodegradable and environmentally friendly.

[0044] This invention incorporates PLA fibers into pulp and forms the membrane using a papermaking process. Since papermaking is a mature technology, this method is easily industrially applicable. Furthermore, compared to pure PLA membrane materials, this method significantly reduces processing costs by utilizing the low cost of pulp fibers, thus offering a clear cost advantage over traditional PLA filter materials. Detailed Implementation

[0045] The technical solutions of the present invention will be described in detail below through embodiments. The following embodiments are merely exemplary and can only be used to explain and illustrate the technical solutions of the present invention, and should not be construed as limiting the technical solutions of the present invention.

[0046] Example 1

[0047] 1. Material preparation:

[0048] 10,000 g of PLA fiber with a length of 3 mm and a linear density of 2 dtex; 90,000 g of bleached hardwood pulp; 1,000 g of fragrance; and 100 g of sodium carboxymethyl cellulose dispersant, dispersed to a concentration of 0.1%.

[0049] 2. Pulping and Mixing:

[0050] (1) Added fiber pulping: Hydraulically pulp the added fiber. When pulping, add water first, then add the fiber paperboard. When stirring and pulping, slowly add the polyacrylamide dispersant. After the addition is complete, start pulping. This is beneficial to the full dissolution of the dispersant and can prevent fiber agglomeration or sedimentation. The water to fiber ratio during pulping is 25:1; apply 0.5% dispersant (relative to water), and the pulping time is ≥10 minutes.

[0051] (2) Pulp preparation: Add polylactic acid (PLA) fibers with a length of (0.6~4.0) mm and a linear density of (1.5~3.5) dtex to the wood pulp fiber slurry at a ratio of 20% of the wood pulp fiber mass. Stir at 1200 rpm for 20 minutes using a high-speed stirring device to ensure that the PLA fibers are evenly dispersed and avoid agglomeration.

[0052] (3) Apply fragrance: Add fragrance to the slurry at a ratio of 30:1 (to the mass ratio of the slurry prepared in the above steps) to prepare a wet mixture. The concentrated liquid and fragrance are thoroughly mixed evenly, and the concentration, viscosity and other indicators of the wet mixture are controlled to meet the process requirements.

[0053] 3. Dry Material Preparation: The tobacco leaves are processed to increase the variety and content of aroma substances in the raw material. The specific steps are as follows:

[0054] (1) Prepare a mixed aqueous solution of potassium carbonate and proline in a mass ratio of 1:10, and apply it evenly to the tobacco leaves according to the addition ratio of 10 g of mixed solution per 100 g of tobacco leaves, and store at room temperature for 3 h.

[0055] (2) After adding the feed, the tobacco leaves are dried in a drum at 40°C until the moisture content reaches 8%.

[0056] (3) Apply propylene glycol evenly to the dried tobacco leaves at a ratio of 5 g per 100 g of dried tobacco leaves.

[0057] (4) The dried tobacco leaves are processed by a twin-screw extrusion puffing equipment. The screw speed of the extrusion puffing equipment is 5 rpm, the temperature of the feeding section is 70℃, the temperature of the transition section is 80℃, and the temperature of the die head section is 120℃ to obtain the processed tobacco material.

[0058] (5) The treated tobacco material is crushed using a high-speed pulverizer to obtain tobacco powder with a particle size of 80 mesh.

[0059] 4. Mixing of dry and wet materials: The dry and wet materials are mixed evenly. The mixing equipment is a high-speed mixer, the mixing ratio of dry and wet materials is 50:32, and the moisture content of the mixed materials is controlled at 38%.

[0060] 5. Hot-pressing and consolidation: The dry and wet materials are subjected to three stages of rolling, with the sheet thickness controlled at 0.15 mm after rolling. The first rolling temperature is set to 100℃, the second rolling temperature to 120℃, and the third rolling temperature to 130℃. The rolling pressure for each stage is 6 MPa, resulting in a PLA composite base paper with a basis weight of 35 g / m². During this process, the PLA fibers soften upon heating, acting as bonding points to tightly adhere to the wood pulp fibers. After hot-pressing, the porosity of the paper base material decreases, the density increases, and the tensile strength improves, resulting in a compact PLA composite paper base filter material.

[0061] 6. Hot air drying: Further remove moisture from the hot-pressed and solidified film base. The moisture content of the dried film base is 8%.

[0062] 7. Slitting: Slitting and rolling the sheet according to the usage requirements. The slitting and rolling weight is 15kg / roll, and the width is 120mm.

[0063] 8. Packaging: Seal the rolled-up sheet for packaging.

[0064] The prepared PLA paper-based filter material has good physical properties. After hot pressing, the porosity of the paper-based material is reduced to 5%, the density increases by 20%, and the tensile strength is increased by 5%, resulting in a compact PLA composite paper-based filter material.

[0065] As can be seen from Table 1, the PLA paper-based composite filter material prepared by the present invention has high strength and can meet the processing requirements of cigarette filter material.

[0066] Table 1 Physical properties of PLA paper-based composite filter media

[0067]

[0068] Filter rod samples were prepared on the same machine, with a circumference of 23 mm, a filter tip length of 120.0 mm, and a filter tip structure of 15 mm (acetic acid cellulose segment) + 15 mm (PLA paper-based filter material). Blank filter rod samples were also prepared as controls. Based on a certain cigarette brand (cigarette length 84 mm, circumference 24.3 mm, filter tip length 30.0 mm), filter rod samples were prepared on the same machine, and cigarette samples were rolled using these filter rods on the same machine. To ensure the consistency of tobacco content in the tested cigarette samples, the prepared cigarette samples were screened according to a draw resistance of 1020±100 Pa, a mass of 0.88±0.02 g, and a filter tip ventilation rate of 20±2% before being used as test samples.

[0069] As can be seen from Table 2, compared with pure cellulose acetate filter rods and pure paper-based filter materials, the cigarette products made from the PLA paper-based filter material prepared by this invention have excellent ability to reduce harmful components in smoke. Its harm-reducing performance increases significantly with the increase of PLA addition. The PLA paper-based filter material has strong processability, avoiding the problems of low strength, poor processability and low adsorption efficiency of traditional pure wood pulp fiber paper-based filter materials, and has good application prospects.

[0070] Table 2. Effects of different PLA paper addition amounts on the test results of physical and smoke indicators of cigarette filter materials.

[0071]

[0072] Sensory evaluations were conducted on the above four cigarette samples according to GB / T 5606.4-2005 "Cigarettes Part 4: Sensory Technical Requirements" and YC / T 497-2014 "Sensory Evaluation Method for Chinese-style Cigarettes," and a comparison was made with a slim cigarette of the same type. Table 3 shows that, compared with pure acetate fiber filter rods, cigarettes made from the PLA paper-based filter material prepared in this invention, while meeting the requirement of reducing tar release, exhibit significantly improved aroma quality and quantity, increased smoothness, enhanced strength and concentration, and improved oral comfort. This compensates for the aroma loss caused by high filtration and high ventilation, demonstrating promising application prospects.

[0073] Table 3. Sensory evaluation results of four types of low-tar cigarette products

[0074]

[0075] Example 2

[0076] PLA paper-based sheet substrate is prepared using the process and method described in Example 1, and tobacco extract is processed, including the following steps:

[0077] (1) Prepare a mixed aqueous solution of sodium carbonate, alanine and arginine in a mass ratio of 1:3:10, and apply it evenly to the tobacco shreds at a ratio of 3 g of mixed solution per 100 g of tobacco leaves. Store at room temperature for 1 hour.

[0078] (2) Dry the tobacco shreds after adding the feed at 50°C using a vibrating screen until the moisture content reaches 8%.

[0079] (3) The dried tobacco leaves were processed using a twin-screw extrusion puffing equipment. The screw speed of the extrusion puffing equipment was 6 rpm, the temperature of the feeding section was 70°C, the temperature of the transition section was 90°C, and the temperature of the die head section was 130°C. The processed tobacco leaves were then crushed to obtain tobacco powder, which was used to replace the tobacco powder in Example 1.

[0080] The sensory quality of heated cigarettes using the composite filter rod of this embodiment was compared with that of heated cigarettes using a cooling filter rod coated with oiled cellulose paper. The sensory evaluation results are shown in Table 4 below. Compared with the control heated cigarette, all indicators of the test cigarettes were significantly improved, and the outlet temperature was significantly reduced.

[0081] Table 4 Sensory Evaluation Form

[0082]

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for preparing a flavor-enhancing high-strength polylactic acid paper-based filter material based on a roll-pressing reconstituted tobacco leaf process, characterized in that, Includes the following steps: S1. The added fibers, polylactic acid fibers and fragrances are configured into a wet material component according to the set parameters; S2. Process the tobacco raw materials to increase the types and content of aroma substances in the tobacco raw materials to obtain dry material components; S3. The aforementioned wet material components and dry material components are uniformly mixed to obtain a mixture, and the moisture content of the mixture is controlled at 30-40%. S4. The aforementioned mixture is subjected to 3-5 stages of roller pressing, wherein 2-3 stages of roller pressing are equipped with a heating device to obtain a sheet base; S5. The aforementioned sheet base is dried, and the moisture content of the dried sheet base is 8-11%, thus obtaining polylactic acid paper-based filter material.

2. The method for preparing aroma-enhancing high-strength polylactic acid paper-based filter material based on the roll-pressing reconstituted tobacco leaf process according to claim 1, characterized in that, In step S1, the specific steps for configuring the added fibers, polylactic acid fibers, and fragrances into a wet mixture are as follows: S11. Hydraulically pulping with added fiber to obtain added fiber pulp; S12. Add polylactic acid fiber to the aforementioned added fiber slurry at a ratio of 5%-50% of the added fiber mass, and mix evenly to obtain a mixed slurry; S13. Add the fragrance to the aforementioned mixed slurry according to the set mass ratio, and mix thoroughly to obtain the wet material component.

3. The method for preparing aroma-enhancing high-strength polylactic acid paper-based filter material based on the roll-pressing reconstituted tobacco leaf process according to claim 2, characterized in that, In step S11, the hydraulic pulping process is as follows: first add water, then add fiberboard, and add dispersant while stirring and pulping. After the dispersant is added, pulping begins. The mass ratio of water to added fiber is 25:1-10:1, the mass of the applied dispersant relative to water is 0.1-0.5%, and the pulping time is at least 10 minutes.

4. The method for preparing aroma-enhancing high-strength polylactic acid paper-based filter material based on the roll-pressing reconstituted tobacco leaf process according to claim 3, characterized in that, The dispersant is one or more of sodium carboxymethyl cellulose, hydroxypropyl cellulose, methyl cellulose, hydroxypropyl methyl cellulose, hydroxypropyl guar gum, and polyacrylamide.

5. The method for preparing aroma-enhancing high-strength polylactic acid paper-based filter material based on the roll-pressing reconstituted tobacco leaf process according to claim 2, characterized in that, In step S12, the polylactic acid fiber has a length of 0.5-6.0 mm and a linear density of 1.5-3.5 dtex. It is stirred for 20-30 minutes at 1000-1500 rpm using a high-speed stirring device.

6. The method for preparing aroma-enhancing high-strength polylactic acid paper-based filter material based on the roll-pressing reconstituted tobacco leaf process according to claim 1, characterized in that, In step 2, the raw tobacco leaves are processed to increase the types and content of aroma substances, and the specific steps to obtain the dry components are as follows: S21. Prepare a mixed aqueous solution of carbonate and amino acids and apply it evenly to the tobacco raw material; S22. Heat-treat the tobacco raw material after adding the additives, and the moisture content of the treated tobacco raw material is 6-8%; S23. The tobacco raw material after adding the ingredients is extruded and expanded to obtain processed tobacco raw material; S24. Crush the heat-treated tobacco leaves to a mesh size of 80-300 mesh.

7. The method for preparing aroma-enhancing high-strength polylactic acid paper-based filter material based on the roll-pressing reconstituted tobacco leaf process according to claim 1, characterized in that, In step S2, the tobacco raw material is a single-material tobacco or leaf blend formulation composed of tobacco leaves, shredded tobacco, or tobacco dust.

8. The method for preparing aroma-enhancing high-strength polylactic acid paper-based filter material based on the roll-pressing reconstituted tobacco leaf process according to claim 6, characterized in that, In step S21, the carbonate is one or a mixture of sodium carbonate and potassium carbonate; the amino acid is one or a mixture of several of alanine, glycine, phenylalanine, arginine, lysine, valine, and proline.

9. The method for preparing aroma-enhancing high-strength polylactic acid paper-based filter material based on the roll-pressing reconstituted tobacco leaf process according to claim 6, characterized in that, In step S21, the mass ratio of carbonate to amino acid in the carbonate-amino acid mixed aqueous solution is 1:10~20.

10. The method for preparing aroma-enhancing high-strength polylactic acid paper-based filter material based on the roll-pressing reconstituted tobacco leaf process according to claim 1, characterized in that, In step S3, the mixing ratio of dry and wet materials is 50:15~20.

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