Preparation method of sheet for heating cigarette

Abstract

The invention belongs to the field of tobaccos, and provides a preparation method of a sheet for heating cigarettes, which comprises the following steps: soaking the tobacco sheet in hot water for extraction for multiple times, carrying out solid-liquid separation, respectively collecting solid products and extracting solutions obtained in each time, combining the solid products obtained in each time to obtain a solid-phase mixture, combining the extracting solutions obtained in each time, and concentrating to obtain the sheet for heating the cigarettes. Coating liquid is obtained; uniformly mixing the solid product, a smoke agent and an alcohol solvent, reacting in an inert atmosphere at preset temperature and pressure, collecting a solid mixture, washing and drying to obtain a solid product containing the smoke agent; the solid product containing the smoke agent is subjected to pulp grinding and papermaking, and a film base is obtained; according to the method, a mild chemical reaction mode is adopted for the first time to load the smoke agent onto the paper-making process tobacco sheet, the problem that the utilization rate of the smoke agent in a traditional coating method is low is effectively solved, and meanwhile the sensory quality of tobacco is also improved.

Description

Technical Field

[0001] This invention belongs to the tobacco industry and relates to a method for preparing a sheet for heating cigarettes. Background Technology

[0002] The information disclosed in this background section is intended only to enhance understanding of the overall background of the invention and is not necessarily to be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

[0003] With traditional cigarettes facing strict restrictions due to health risks, heated tobacco products (HNB) have become a focus of industry transformation due to their characteristics of "low-temperature heating and reduced release of harmful substances." Heated cigarette sheets, as the core material of HNB products, are produced through processes such as papermaking, dry papermaking, slurry processing, and roll pressing. They combine three major functions: tar reduction and harm reduction, taste restoration, and process adaptability, becoming a key carrier for simulating the experience of traditional cigarettes.

[0004] Heated cigarette sheets are the core material of heated non-combustible (HNB) tobacco products, and their smoke-generating agent loading directly affects the product's smoke release efficiency and sensory experience. In current sheet manufacturing processes, although the papermaking method achieves smoke-generating agent loading through coating technology, it is limited by the coating rate and the sheet substrate's adsorption capacity, resulting in low smoke-generating agent utilization, which in turn affects the continuity and stability of the smoke.

[0005] Therefore, there is an urgent need to improve the smoke-generating agent loading and sensory experience in sheet cigarettes made by papermaking. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a method for preparing heated tobacco sheets. This invention, for the first time, employs a mild chemical reaction to load a smoking agent onto papermaking tobacco sheets, effectively solving the problem of low smoking agent utilization in traditional coating methods. Simultaneously, the sensory quality of the tobacco is also improved.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A first aspect of the present invention provides a method for preparing a sheet for heating cigarettes, comprising: The tobacco flakes were extracted multiple times by soaking in hot water, and the solid and liquid were separated. The solid products and extracts obtained from each extraction were collected separately. The solid products obtained from each extraction were combined to obtain a solid mixture. The extracts obtained from each extraction were combined and concentrated to obtain a coating liquid. The solid product, smoke generator, and alcohol solvent are mixed evenly and reacted in an inert atmosphere at a preset temperature and pressure. The solid mixture is collected, washed, and dried to obtain a solid product containing the smoke generator. The solid product containing the smoking agent is ground into a pulp and then formed into sheet substrate; The coating liquid is applied to the sheet base, dried, and slit to obtain tobacco sheets.

[0008] In a second aspect, the present invention provides a heated cigarette sheet prepared by the method described above.

[0009] A third aspect of the present invention provides the application of the above-described sheet for heated cigarettes in improving the efficiency of heated cigarette smoke release and sensory experience.

[0010] Beneficial effects of the present invention (1) This invention is the first to use a mild chemical reaction to load the smoking agent onto the tobacco sheet made by papermaking, which effectively solves the problem of low utilization rate of the smoking agent in the traditional coating method. At the same time, the sensory quality of the tobacco is also improved.

[0011] (2) The present invention utilizes alcohol solvents to destroy the wax layer on the surface of tobacco, reduce its surface hydrophobicity, and enhance the diffusion ability of smoking agent molecules in tobacco by taking advantage of the good permeability of alcohols, thereby effectively increasing the loading of propylene glycol and the overall loading of smoking agent, and reducing the reaction temperature.

[0012] (3) The preparation method of the present invention is simple, practical and easy to promote. Attached Figure Description

[0013] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. Exemplary embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0014] Figure 1 This is a photograph of the actual tobacco sheet of the present invention. Detailed Implementation

[0015] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0016] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of skill in the art. The reagents and raw materials used in this invention are readily available through conventional means, and unless otherwise specified, they are used in accordance with conventional methods in the art or product instructions. Similarly, unless otherwise specified, the test methods of this invention are performed in accordance with conventional methods in the art or industry-standard methods or practices. Furthermore, any methods and materials similar to or equivalent to those described herein may be applied to the methods of this invention. The preferred embodiments and materials described herein are for illustrative purposes only.

[0017] This invention mainly proposes a method for preparing a thin sheet for heating cigarettes, comprising: The tobacco flakes were extracted multiple times by soaking in hot water, and the solid and liquid were separated. The solid products and extracts obtained from each extraction were collected separately. The solid products obtained from each extraction were combined to obtain a solid mixture. The extracts obtained from each extraction were combined and concentrated to obtain a coating liquid. The solid product, smoke generator, and alcohol solvent are mixed evenly and reacted in an inert atmosphere at a preset temperature and pressure. The solid mixture is collected, washed, and dried to obtain a solid product containing the smoke generator. The solid product containing the smoking agent is ground into a pulp and then formed into sheet substrate; The coating liquid is applied to the sheet base, dried, and slit to obtain tobacco sheets.

[0018] The extraction temperature, time, and solid-liquid ratio affect the extraction rate, the retention of aroma substances, and the quality of the final product. Therefore, this invention studies the extraction temperature, time, solid-liquid ratio, and number of extractions. Preferably, the extraction temperature is 60-70℃, the solid-liquid ratio is 1:8-1:10, the time is 60-100 min, and the number of extractions is 2 times to obtain better extraction results.

[0019] The amount of smoking agent and alcohol solvent used will affect the loading effect of the smoking agent on tobacco and the subsequent sensory quality. Therefore, the present invention has studied the mass ratio of solid mixture and smoking agent to alcohol solvent. Preferably, the mass ratio of solid mixture and smoking agent to alcohol solvent is 1:20-22:0.2-1.1 to obtain better loading effect and sensory quality.

[0020] The reaction temperature affects the reaction effect between the smoke-generating agent and tobacco. Therefore, the present invention has studied the reaction temperature. Preferably, the preset temperature is 70-100℃ to improve the reaction efficiency.

[0021] Pressure can affect reaction efficiency and the penetration effect of the smoke-generating agent in tobacco plant cells. Therefore, this invention studies the reaction pressure. Preferably, the preset pressure is 0.4-0.6 MPa to obtain better reaction and penetration effects.

[0022] The composition and ratio of the alcohol solvent affect the loading of the smoke generator. Therefore, the present invention has studied the composition and ratio of the alcohol solvent. Preferably, the alcohol solvent is composed of methanol and ethanol in a ratio of 1.5-2.5:1, more preferably 2:1, to obtain a better loading.

[0023] The conditions of pulping affect the physical properties and microstructure of tobacco sheets in papermaking. Therefore, this invention studies the concentration, pressure and freeness of the pulp after pulping. Preferably, the concentration of the pulp is 10%-12%, the pulping pressure is 0.3-0.5 MPa, and the freeness of the pulp after pulping is 25ºSR~30ºSR to obtain better performance.

[0024] This invention does not impose special requirements on the quantitative composition of tobacco sheets; preferably, the quantitative composition of the sheet base after papermaking is 70-75 g / m³. 2 To meet the requirements of different processes.

[0025] The present invention will be further described in detail below with reference to specific embodiments. It should be noted that the specific embodiments are explanations of the present invention and not limitations thereof.

[0026] Example 1 This embodiment provides a method for preparing a sheet for heating cigarettes, including: (1) Soak tobacco leaves in hot water at 60°C (solid-liquid ratio of 1:8) for 80 min, separate solid and liquid, and collect the first solid product and the first extract; repeat the above steps to obtain the second solid product and the second extract; combine the first solid product and the second solid product to obtain a solid mixture, combine the first extract and the second extract, concentrate, and obtain the coating solution. (2) The solid mixture, the fumigating agent, and the alcohol solvent are mixed evenly, and the reaction is carried out under nitrogen protection at 70°C and 0.5 MPa. The solid mixture is collected, cooled to room temperature, washed with deionized water, and dried at 45°C to obtain a solid product containing the fumigating agent; wherein the fumigating agent is a mixture of propylene glycol and glycerol, V PG :V Gly The ratio of methanol to ethanol is 4:6; the alcohol solvent is a mixture of methanol and ethanol with a mass ratio of 2:1; the mass ratio of solid product to smoke agent and alcohol solvent is 1:20:0.6.

[0027] (3) The solid product containing the smoke-generating agent is milled and formed to obtain a sheet base; wherein the concentration of the milling is 10%, the milling pressure is 0.3 MPa, and the beating degree of the milled slurry is 29ºSR.

[0028] (4) The viscosity of the coating liquid is controlled at 12 cP; it is coated on the substrate at a coating rate of 52%, dried and cut to obtain tobacco sheets.

[0029] Example 2 This embodiment provides a method for preparing a sheet for heating cigarettes, including: (1) Soak tobacco leaves in hot water at 60°C (solid-liquid ratio of 1:8) for 80 min, separate solid and liquid, and collect the first solid product and the first extract; repeat the above steps to obtain the second solid product and the second extract; combine the first solid product and the second solid product to obtain a solid mixture, combine the first extract and the second extract, concentrate, and obtain the coating solution. (2) The solid mixture, the fumigating agent, and the alcohol solvent are mixed evenly, and the reaction is carried out under nitrogen protection at 70°C and 0.5 MPa. The solid mixture is collected, cooled to room temperature, washed with deionized water, and dried at 45°C to obtain a solid product containing the fumigating agent; wherein the fumigating agent is a mixture of propylene glycol and glycerol, V PG :V Gly The ratio of methanol to ethanol is 4:6; the alcohol solvent is a mixture of methanol and ethanol, with a mass ratio of methanol to ethanol of 1.5:1; the mass ratio of solid product to smoke agent and alcohol solvent is 1:20:0.6.

[0030] (3) The solid product containing the smoke-generating agent is milled and formed to obtain a sheet base; wherein the concentration of the milling is 10%, the milling pressure is 0.3 MPa, and the beating degree of the milled slurry is 29ºSR.

[0031] (4) The viscosity of the coating liquid is controlled at 12 cP; it is coated on the substrate at a coating rate of 52%, dried and cut to obtain tobacco sheets.

[0032] Example 3 This embodiment provides a method for preparing a sheet for heating cigarettes, including: (1) Soak tobacco leaves in hot water at 60°C (solid-liquid ratio of 1:8) for 80 min, separate solid and liquid, and collect the first solid product and the first extract; repeat the above steps to obtain the second solid product and the second extract; combine the first solid product and the second solid product to obtain a solid mixture, combine the first extract and the second extract, concentrate, and obtain the coating solution. (2) The solid mixture, the fumigating agent, and the alcohol solvent are mixed evenly, and the reaction is carried out under nitrogen protection at 70°C and 0.5 MPa. The solid mixture is collected, cooled to room temperature, washed with deionized water, and dried at 45°C to obtain a solid product containing the fumigating agent; wherein the fumigating agent is a mixture of propylene glycol and glycerol, V PG :V Gly The ratio of methanol to ethanol is 4:6; the alcohol solvent is a mixture of methanol and ethanol, with a mass ratio of methanol to ethanol of 2.5:1; the mass ratio of solid product to smoke agent and alcohol solvent is 1:20:0.6.

[0033] (3) The solid product containing the smoke-generating agent is milled and formed to obtain a sheet base; wherein the concentration of the milling is 10%, the milling pressure is 0.3 MPa, and the beating degree of the milled slurry is 29ºSR.

[0034] (4) The viscosity of the coating liquid is controlled at 12 cP; it is coated on the substrate at a coating rate of 52%, dried and cut to obtain tobacco sheets.

[0035] Comparative Example 1 The following table (V) from the paper "Prelim inary study on reducing lignin content and increasing smoke agent loading in tobacco stem by solvothermal method" is used. PG :V Gly The result of processing tobacco stem fragments using the processing technology.

[0036] Comparative Example 2 The difference from Example 1 is that no alcohol solvent was added in step (2), while other conditions remained the same.

[0037] Experimental Example 1 The loading of the smoke-generating agent in the solid product containing the smoke-generating agent prepared in Example 1 was determined by GC-FID (Agilent Technologies 7820A). The results are shown in Table 1.

[0038] Table 1. Propylene glycol and glycerol loading in each sample. <![CDATA[Solvent (V PG :V Gly )(4:6)]]> Propylene glycol loading (wt.%) Glycerin loading (wt.%) Example 1 29.0 44.5 Comparative Example 1 0.52 54.14 Therefore, this invention effectively solves the problem of low smoke-generating agent utilization in traditional coating methods by loading the smoke-generating agent onto papermaking tobacco sheets through a mild chemical reaction. Simultaneously, the sensory quality of the tobacco is also improved. The addition of an alcohol solvent effectively increases the loading of propylene glycol and the overall loading of the smoke-generating agent, while lowering the reaction temperature.

[0039] Experiment Example 2 The tobacco sheets prepared in Example 1 and Comparative Example 2 were processed into tobacco sheet shreds through slicing and rolling, and then filled into heated cigarette sticks to obtain shaped heated cigarette samples. The sensory quality of the molded heated cigarette samples prepared in Example 1 and Comparative Example 2 was compared according to the industry-standard sensory evaluation criteria. The indicators are as follows: aroma (25), smoke (30), strength (10), irritation (10), aftertaste (15), and uniformity (10). The test results are shown in Table 2.

[0040] Table 2 Summary of Sensory Evaluation of Heated Cigarettes name Total score (100) Example 1 90.38 Comparative Example 2 86.13 Therefore, it can be seen that the introduction of alcohol solvents can better improve the overall sensory quality of heated cigarettes.

[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing a sheet for heating cigarettes, characterized in that, include: The tobacco flakes were extracted multiple times by soaking in hot water, and the solid and liquid were separated. The solid products and extracts obtained from each extraction were collected separately. The solid products obtained from each extraction were combined to obtain a solid mixture. The extracts obtained from each extraction were combined and concentrated to obtain a coating liquid. The solid product, smoke generator, and alcohol solvent are mixed evenly and reacted in an inert atmosphere at a preset temperature and pressure. The solid mixture is collected, washed, and dried to obtain a solid product containing the smoke generator. The solid product containing the smoking agent is ground into a pulp and then formed into sheet substrate; The coating liquid is applied to the sheet base, dried, and slit to obtain tobacco sheets.

2. The method for preparing heated cigarette sheet as described in claim 1, characterized in that, The extraction temperature is 60-70℃, the solid-liquid ratio is 1:8-1:10, the extraction time is 60-100 min, and the extraction is performed twice.

3. The method for preparing heated cigarette sheet as described in claim 1, characterized in that, The mass ratio of the solid product, the fuming agent, and the alcohol solvent is 1:20-22:0.2-1.

1.

4. The method for preparing heated cigarette sheet as described in claim 1, characterized in that, The preset temperature is 70-100℃.

5. The method for preparing heated cigarette sheet as described in claim 1, characterized in that, The preset pressure is 0.4-0.6 MPa.

6. The method for preparing heated cigarette sheet as described in claim 1, characterized in that, The alcohol solvent is composed of methanol and ethanol in a ratio of 1.5-2.5:1 or 2:

1.

7. The method for preparing heated cigarette sheet as described in claim 1, characterized in that, The concentration of the pulp is 10%-12%, the pulping pressure is 0.3-0.5MPa, and the freeness of the pulp after pulping is 25ºSR~30ºSR.

8. The method for preparing heated cigarette sheet as described in claim 1, characterized in that, The quantitative amount of the film base after papermaking is 70-75 g / m³. 2 .

9. A sheet for heated cigarettes prepared by the method according to any one of claims 1-8.

10. The application of the sheet for heated cigarettes as described in claim 9 in improving the efficiency of smoke release and sensory experience of heated cigarettes.

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