Preparation method of heating tobacco cigarette core material

Abstract

The invention discloses a preparation method of a heating tobacco cigarette core material, and belongs to the technical field of tobacco preparation. The method specifically comprises the following steps: firstly, preparing a carrier base material: carrying out papermaking molding on a slurry body composed of ultramicro bamboo powder and cellulosic fibers to obtain the carrier base material with a porous three-dimensional network structure; secondly, preparing a coating liquid: uniformly mixing the ultramicro smoke powder with a smoke agent, essence and perfume, an anti-moisture-absorption agent and water according to a certain proportion to prepare the coating liquid; and finally, preparing a heated tobacco core material: performing double-sided or single-sided coating on the coating liquid and a carrier base material by adopting a calendering coating process, and then drying and rolling to prepare a core material finished product capable of being used for central heating tobacco cigarette production. The heated tobacco core material prepared according to the process autonomously realizes the'differentiated ', 'customized' and'controllable 'production of new categories of heated tobacco core materials.

Description

Technical Field

[0001] The invention relates to a method for preparing a heated tobacco cigarette core material, belonging to the technical field of tobacco preparation. Background Art

[0002] With the promulgation and implementation of the "Public Smoking Ban" by member states around the world and the continuous improvement of smokers' health awareness, the market sales of traditional combustion cigarettes have gradually declined. Heated cigarettes have gradually become the choice of major multinational tobacco companies to cope with the new situation due to their low tar, low harm, environmental friendliness, and easy acceptance. The core raw material of heated tobacco is tobacco flakes. Tobacco flakes are processed products of tobacco waste and are the carriers of nicotine, smoke-generating agents, flavors and fragrances, and concentrates.

[0003] Currently, the mainstream international heated tobacco products include the centrally heated heated tobacco IQOS products represented by Philip Morris International and the circumferentially heated heated tobacco Glo products represented by British American Tobacco. To date, more than US$5 billion has been invested in the research and development and scientific testing of low-risk tobacco products, and its products have a high degree of recognition in the market.

[0004] The four processes used in the preparation of heated tobacco core materials in China, namely, papermaking and improved papermaking, thick pulp method, roller pressing method and dry method, have their own characteristics and advantages and disadvantages, including the following points. (1) The heated tobacco core materials prepared by papermaking and improved papermaking methods have the advantages of high physical strength, not easy to break, and adjustable and controllable physical and chemical indicators; however, since the loading of effective substances in the forming process of heated tobacco core materials mainly depends on the absorption of the carrier substrate, the effective substance loading of the core materials is low, the mass per unit volume is light, and the thermal conductivity is poor, resulting in insufficient smoke generation, insufficient aroma and other quality defects. Usually, they can only be used in heaters with circumferential (i.e., surrounding) heating or surrounding-center combined heating modes. (2) The heated tobacco core materials prepared by the thick pulp method have good thickness and quantitative stability and heat transfer performance. At the same time, due to its high effective substance content, its smoke and aroma production are good. It is the mainstream preparation process technology for central heating type heated tobacco core materials at present; however, the water content of the mixed slurry of the thick pulp method is relatively high, reaching about 80%, resulting in the loss of aroma and aerosol generating agent in the subsequent drying process. (3) The rolling process is similar to the thick slurry process, and the process is relatively simple. The heated tobacco core material prepared by the rolling process can retain the original quality and characteristics of the tobacco substance to a large extent. At the same time, the moisture content of the mixed material during the forming process is low, only about 20% to 30%, the production energy consumption requirement is low, and the loss of aroma and aerosol forming agent is small; however, its physical indicators such as tensile strength and elongation and processing resistance are poor, and it is easy to break during the rolling process, affecting continuous production. (4) The heated tobacco core material prepared by the dry process has a more suitable structure, and the amount of smoke and aroma is better, which can better match the center-heating heated tobacco cigarette smoking device; however, the physical indicators such as uniformity and thickness of the outer fiber in the process of dry forming into a carrier substrate fluctuate greatly, resulting in poor uniformity of the load of effective substances in the subsequent coating process, and ultimately causing large fluctuations in the physical and chemical indicators of the finished product.

[0005] Taking Philip Morris International's IQOS as an example of an international mainstream heated tobacco cigarette product, Philip Morris International has strengthened its internal development of patented technology while also paying attention to the protection of its patent rights externally. There are no ideas, processes or products in China that surpass Philip Morris' products. Therefore, the key to the research is to overcome the equipment bottleneck that affects and restricts product quality and quality stability, break through the patent blockade of foreign multinational tobacco companies such as IQOS, and promote the innovation of process and equipment systems. Summary of the invention

[0006] The present invention proposes a heated tobacco cigarette core material and a preparation method thereof, which is different from the existing heated tobacco core material production processes such as papermaking thick pulp compounding method, thick pulp method, papermaking method and roller pressing method. Through the innovative research and application of calendering coating process and ultrafine powder forming process, the bottleneck of process and equipment that affect and restrict product quality and quality stability is overcome, and the patent blockade of multinational tobacco companies such as Philip Morris International and British American Tobacco is broken, and the innovation and upgrading of technology, equipment, process and products are promoted. The "differentiation", "customization" and "controllable" production of new categories of heated tobacco core materials is realized through independent research and development. The specific preparation steps are as follows:

[0007] (1) Preparing ultrafine bamboo powder from the dried bamboo material.

[0008] (2) Mixing cellulose fibers with water to prepare cellulose fiber slurry.

[0009] (3) The ultrafine bamboo powder prepared in step (1) and the cellulose fiber slurry prepared in step (2) are mixed evenly to prepare a mixed slurry.

[0010] (4) preparing a carrier substrate from the mixed slurry prepared in step (3) according to a papermaking and papermaking forming process;

[0011] (5) Preparing the tobacco leaf formula raw materials into ultrafine tobacco powder.

[0012] (6) mixing the ultrafine smoke powder prepared in step (5) with a smoke generating agent, flavors and fragrances, an anti-hygroscopic agent, and water to obtain a coating liquid;

[0013] (7) applying the coating solution prepared in step (6) onto the carrier substrate prepared in step (4) by a calender coating process to prepare a coating sample;

[0014] (8) The coated sample prepared in step (7) is dried and rolled to obtain a heated tobacco cigarette core material.

[0015] Preferably, the bamboo material in step (1) is the stalk of bamboo, the median particle size of the ultrafine bamboo powder is 69.28 μm to 23.00 μm, and the volume average diameter is 87.29 μm to 37.74 μm.

[0016] Preferably, in step (2), the cellulose fiber is one or more of wood pulp, hemp pulp, cotton pulp, bamboo pulp, and straw pulp mixed in any proportion; the concentration of the pulp is controlled to be 3.6%±0.3%; the Schober beating degree of the cellulose fiber pulp is 50 0 SR~90 0 SR.

[0017] Preferably, in step (3), calculated by mass percentage, the mass percentage content of the ultrafine bamboo powder is 60% to 95%, the mass percentage content of the cellulose fiber slurry is 5% to 40%, and the total mass percentage content of the ultrafine bamboo powder and the cellulose fiber slurry is 100%.

[0018] Preferably, the papermaking and forming process in step (4) is one of the papermaking and forming processes of cigarette paper, tipping paper, and papermaking and reconstituted tobacco leaves; the absolute dry basis weight of the prepared carrier substrate is 30 g / m 2 ~80g / m 2 .

[0019] Preferably, the tobacco formula raw material in step (5) is one or more of tobacco raw materials, tobacco fragments, and tobacco dust mixed in any proportion;

[0020] Preferably, the ultrafine smoke powder in step (5) has the following characteristics: a median particle size of 18.86 μm to 8.83 μm, and a volume average diameter of 33.93 μm to 13.29 μm.

[0021] Preferably, in step (6), there are 50 to 80 parts of ultrafine smoke powder; 10 to 30 parts of smoke agent; 0 to 5 parts of flavors and fragrances; and 0.05 to 3 parts of anti-hygroscopic agent; the smoke agent is one or more of polycarbon fatty alcohols such as propylene glycol, glycerol, mannitol, 1,3-propanediol, sorbitol and xylitol, and polycarbon fatty acids in any proportion; the anti-hygroscopic agent is one or more of tamarind polysaccharide gum, beeswax, cocoa butter, and sodium carboxymethyl cellulose in any proportion; the amount of water used is equal to the total mass of the ultrafine smoke powder, smoke agent, flavors and fragrances, and anti-hygroscopic agent (for example, if the total mass of the ultrafine smoke powder, smoke agent, flavors and fragrances, and anti-hygroscopic agent is 1000 kg, the amount of water used is also 1000 kg).

[0022] Preferably, the coating rate in the coating process in step (7) is 50% to 70%, and double-sided coating or single-sided coating is adopted.

[0023] Preferably, the absolute dry weight of the heated tobacco cigarette core material in step (8) is 60 g / m 2 ~200g / m 2 .

[0024] The principle of the present invention is as follows: Bamboo powder is a natural plant fiber filler derived from bamboo, and its main components include cellulose, lignin, hemicellulose, benzene alcohol extract, etc. Cellulose is the main component of bamboo fiber, and hemicellulose is composed of complex polysaccharides composed of multiple sugar units, which is the connecting link and filler between fibers and microfibers; lignin is an aromatic polymer compound between the intercellular layer and microfibers, and these components contain a large number of hydroxyl, carboxylhydroxyl and other groups. Bamboo powder fiber is composed of multiple layers and alternately thin and thick, and each layer is composed of microfibrils, which are arranged in a spiral manner. Bamboo powder fiber is regarded as a hollow multi-layer thick-walled cylinder composed of microfibrils; the groups and structures in the bamboo powder components are conducive to the combination with the cellulose fiber groups during the carrier substrate molding process, and can also improve the absorption performance of the carrier substrate.

[0025] Technical effects of the present invention:

[0026] (1) The ultrafine grinding of raw materials significantly increases the degree of homogenization of raw materials, and most importantly, improves the specific surface area and pore volume of bamboo raw materials. Then, the slurry composed of ultrafine bamboo powder and cellulose fiber is formed into a carrier substrate with a porous three-dimensional network structure through a papermaking and forming process. The carrier substrate has the characteristics of high absorbency, high bulk, high tensile strength, high elongation, etc., which significantly improves the absorption performance of the carrier substrate to the coating liquid during the coating process. At the same time, the excellent physical properties of the above-mentioned carrier substrate ultimately give the core material finished product good processing resistance.

[0027] (2) The calendering coating process is to use a calendering roller to coat the coating liquid on the surface of the substrate, and then use a peeling film to heat and melt the coating liquid on the surface of the substrate through the calendering roller and separate it from the peeling film. Since the carrier substrate prepared by using ultra-fine bamboo powder has good absorption performance and high bulk thickness, the coating liquid can be quickly absorbed and penetrated into the interior of the carrier substrate. After the absorption and penetration reaches saturation, the coating liquid can be evenly dispersed on the surface of the substrate through the extrusion and heating of the calendering roller. After the thermal evaporation of water in the drying process, an air flow channel suitable for the generation of smoke and aroma is formed inside the core material. The setting of the gap between the calendering rollers and the setting of the viscosity of the coating liquid determine the coating rate of the finished product. According to the sensory quality requirements of the finished product, a core material finished product with different coating rates and a high coating rate can be obtained. The final finished product has good physical properties such as high smoothness, thickness, high quantitative control accuracy, and high thermal conductivity. In terms of sensory quality suction performance, it has the characteristics of high smoke concentration, sufficient aroma, and stable suction per puff.

[0028] (3) The use of two kinds of ultrafine powders in combination with the process brings about excellent performance of the core material: mainly manifested in that the ultrafine bamboo powder papermaking molding process can obtain a carrier substrate with high absorbency, high bulk, high tensile strength and high elongation; and the ultrafine tobacco powder used in the calendering and coating process is the source of the core material aroma substance. The heated tobacco core material prepared by the calendering and coating process combined with the application of the carrier substrate has the advantages of high thermal conductivity, high hot water soluble content, dense core material, and uniform and fine surface; after heating, the core material has the advantages of high smoke concentration, sufficient aroma, and stable smoke release. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The microstructure of the mixed slurry system prepared in step (3) of Example 1 under an optical microscope.

[0030] Figure 2 The interaction between the ultrafine bamboo powder and the fibers in the mixed slurry system prepared in step (3) of Example 1 under a scanning electron microscope.

[0031] Figure 3 The microstructure of the carrier substrate prepared in step (4) of Example 1 under a scanning electron microscope; Figure A is the front side, and Figure B is the back side.

[0032] Figure 4 The microstructure of the heated tobacco cigarette core material product prepared in Example 1 under scanning electron microscope at different magnifications; Figure A: 50 μm; Figure B: 100 μm; Figure C: 500 μm; Figure D: 1000 μm.

[0033] Figure 5 The microstructure of the IQOS core material product.

[0034] Figure 6 The present invention is a process flow chart for preparing heated tobacco cigarette core material. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited to the described contents.

[0036] Example 1

[0037] A method for preparing a heated tobacco cigarette core material comprises the following steps:

[0038] (1) The dried bamboo raw material is mechanically crushed and then ultrafinely pulverized to prepare ultrafine bamboo powder. The median diameter (D50) of the ultrafine bamboo powder is 37.50 μm and the volume average diameter is 60.12 μm.

[0039] (2) 300 kg of softwood pulp fiber was added with water and stirred to disintegrate, and the concentration of the pulp was controlled to be 3.6% ± 0.3%. Then, the pulp was made using a disc grinder, and the Schober beating degree of the pulp was 65. 0 SR, cellulose fiber slurry is prepared.

[0040] (3) 700 kg of the ultrafine bamboo powder and 300 kg (absolute dry weight) of the cellulose fiber slurry in step (2) were stirred and mixed uniformly to prepare a mixed slurry.

[0041] (4) The mixed slurry is prepared according to the papermaking process of reconstituted tobacco to obtain a carrier substrate, and the basis weight of the carrier substrate is 50 g / m 2 .

[0042] (5) The tobacco raw materials (specifically tobacco leaves that have undergone initial or re-examination) are ultrafinely ground to obtain ultrafine tobacco powder, the median diameter (D50) of the ultrafine tobacco powder is 10.52 μm, and the volume average diameter is 16.61 μm.

[0043] (6) 600 kg of ultrafine smoke powder, 360 kg of smoke generating agent (composed of propylene glycol and glycerin in a mass ratio of 1:2), 30 kg of flavors and fragrances, 10 kg of anti-hygroscopic agent (composed of beeswax, cocoa butter and tamarind polysaccharide gum in a mass ratio of 1:1.5:1) and 1000 kg of water were added and stirred to obtain a coating liquid.

[0044] (7) The coating liquid prepared in step (6) and the carrier substrate prepared in step (4) are coated on one side by a calender coating process to prepare a coating sample. The coating rate is controlled to be 50% during the coating process. The weight of the finished product after coating is 100 g / m 2 .

[0045] (8) The coated sample prepared in step (7) is dried and rolled to obtain a heated tobacco cigarette core material.

[0046] The microstructure of the mixed slurry prepared in step (3) of this embodiment under an optical microscope is as follows: Figure 1 As shown, from Figure 1 It can be seen that the fibers are interwoven into a three-dimensional network structure, with ultrafine bamboo powder scattered in it, and there is a cross-linking effect between the fibers and the ultrafine bamboo powder. During pulping, the fibers are fibrillated and a large number of fine fibers are produced, while the specific surface area increases and the exposure of hydroxyl groups increases; under the continuous mechanical action of the pulping machine, mechanical entanglement and hydroxyl hydrogen bonding occur between the fibers and between the fibers and the ultrafine bamboo powder.

[0047] The interaction between the ultrafine bamboo powder and the fibers in the slurry system under a scanning electron microscope of the mixed slurry prepared in step (3) of this embodiment is as follows: Figure 2 As shown, from Figure 2It can be seen that the ultrafine powder clusters are on and around the fiber trunk. First, the fine fibers are more easily mechanically entangled with the ultrafine bamboo powder clusters due to their size; second, the fine fibers have more exposed hydroxyl groups and more binding sites, which are easier to combine with the groups on the surface of ultrafine powder.

[0048] The microstructure of the carrier substrate prepared in step (4) of this embodiment under a scanning electron microscope is as follows: Figure 3 As shown in the figure, it can be seen that the carrier substrate after the slurry composed of ultra-fine bamboo powder and cellulose fiber is formed has a porous three-dimensional network structure, which can improve the carrier substrate's absorption performance of the coating liquid during the coating process. At the same time, it can be seen that the fine particles of ultra-fine bamboo powder on the front side of the same paper are significantly less than those on the back side, which is due to the sparse three-dimensional network formed in the early stage of paper making.

[0049] The microstructure test results of the heated tobacco cigarette core material prepared in this example under scanning electron microscope at different magnifications are as follows: Figure 4 As shown in Figure 2, the microstructure of the current mainstream (IQOS) heated tobacco core material product in the world is as follows: Figure 5 As shown, compared Figure 4 and Figure 5 The heated tobacco cigarette core material prepared by the method of the present invention has a compact and porous microstructure, which is conducive to heat conduction and smoke generation during the heating process. At the same time, the microstructure is significantly different from the IQOS core material.

[0050] The physical test results of the core material prepared in this example are shown in Table 1.

[0051] Table 1 Core material physical index test results

[0052] Serial number project Test results 1 Transverse tensile strength (N / m) 193 2 Longitudinal tensile strength (N / m) 599 3 Hot water soluble matter content (%) 54.39 4 <![CDATA[Thermal conductivity (w / mk )]]> 0.1028

[0053] The comparison of the number of detected compounds at different headspace temperatures between the core material prepared in this example and the IQOS core material is shown in Table 2.

[0054] Table 2 Comparison of the number of detected compounds at different headspace temperatures between the core material of the example and the core material of IQOS

[0055]

[0056] It can be seen from Table 2 that with the increase of headspace temperature, the volatile components that can be detected in the two core material samples tend to increase overall. At the set headspace temperature, the number of volatile aroma components detected in the example core materials is higher than that in the IQOS core material.

[0057] The comparison of thermal weight loss of the core material prepared in this example and the IQOS core material is shown in Table 3.

[0058] Table 3 Comparison of thermal weight loss between the core material of the embodiment and the core material of IQOS

[0059] Sample name Thermal weight loss before 350℃ IQOS core material 69.6％ Example 1 Core Material 73.4％

[0060] It can be seen from Table 3 that the thermal weight loss before 350°C exceeds that of the IQOS core material product, indicating that the core material obtained in the embodiment can release more effective substances under the same heating conditions.

[0061] Example 2

[0062] A method for preparing a heated tobacco cigarette core material comprises the following steps:

[0063] (1) The dried bamboo raw material is mechanically crushed and then ultrafinely pulverized to prepare ultrafine bamboo powder. The median diameter (D50) of the ultrafine bamboo powder is 37.50 μm and the volume average diameter is 60.12 μm.

[0064] (2) 400 kg of softwood pulp fiber was added with water and stirred to disintegrate, and the concentration of the pulp was controlled to be 3.6% ± 0.3%. Then, the pulp was made using a disc grinder, and the Schober beating degree of the pulp was 65. 0 SR, cellulose fiber slurry is prepared.

[0065] (3) 600 kg of the ultrafine bamboo powder and 400 kg (absolute dry weight) of the cellulose fiber slurry in step (2) were stirred and mixed uniformly to prepare a mixed slurry.

[0066] (4) The mixed slurry is prepared according to the papermaking process of reconstituted tobacco to obtain a carrier substrate, and the basis weight of the carrier substrate is 50 g / m 2 .

[0067] (5) Ultrafine tobacco powder was prepared by ultrafine grinding of tobacco leaf fragments. The median diameter (D50) of the ultrafine tobacco powder was 10.52 μm and the volume average diameter was 16.61 μm.

[0068] (6) 960 kg of ultrafine smoke powder, 240 kg of smoke generating agent (composed of propylene glycol and glycerin in a mass ratio of 1:2), 60 kg of flavors and fragrances, 36 kg of anti-hygroscopic agent (composed of beeswax, cocoa butter and tamarind polysaccharide gum in a mass ratio of 1:1.5:1) and 1296 kg of water were added and stirred to prepare a coating liquid.

[0069] (7) The coating liquid prepared in step (6) and the carrier substrate prepared in step (4) are coated on one side by a calender coating process to prepare a coating sample. During the coating process, the coating rate is controlled to be 60%. The weight of the finished product after coating is 60 g / m 2 .

[0070] (8) The coated sample prepared in step (7) is dried and rolled to obtain a heated tobacco cigarette core material.

[0071] Example 3

[0072] A method for preparing a heated tobacco cigarette core material comprises the following steps:

[0073] (1) The dried bamboo raw material is mechanically crushed and then ultrafinely pulverized to prepare ultrafine bamboo powder. The median diameter (D50) of the ultrafine bamboo powder is 37.50 μm and the volume average diameter is 60.12 μm.

[0074] (2) 50 kg of softwood pulp fiber was stirred and dispersed with water to control the pulp concentration to 3.6% ± 0.3%, and then pulped using a disc grinder. The pulp had a Schober beating degree of 65. 0 SR, cellulose fiber slurry is prepared.

[0075] (3) 950 kg of the ultrafine bamboo powder and 50 kg (absolute dry weight) of the cellulose fiber slurry in step (2) were stirred and mixed uniformly to prepare a mixed slurry.

[0076] (4) The mixed slurry is prepared according to the papermaking process of reconstituted tobacco to obtain a carrier substrate, and the basis weight of the carrier substrate is 50 g / m 2 .

[0077] (5) Ultrafine tobacco powder was prepared by ultrafine grinding of tobacco leaf fragments. The median diameter (D50) of the ultrafine tobacco powder was 10.52 μm and the volume average diameter was 16.61 μm.

[0078] (6) 720 kg of ultrafine smoke powder, 120 kg of smoke generating agent (composed of propylene glycol and glycerin in a mass ratio of 1:2), 0.6 kg of anti-hygroscopic agent (composed of beeswax, cocoa butter and tamarind polysaccharide gum in a mass ratio of 1:1.5:1) and 840.6 kg of water were added and stirred to prepare a coating liquid.

[0079] (7) The coating liquid prepared in step (6) and the carrier substrate prepared in step (4) are coated on one side by a calender coating process to prepare a coating sample. The coating rate is controlled to be 70% during the coating process. The weight of the finished product after coating is 200 g / m 2 .

[0080] (8) The coated sample prepared in step (7) is dried and rolled to obtain a heated tobacco cigarette core material.

[0081] Comparative Example 1

[0082] As a comparative example, a papermaking process for reconstituted tobacco leaves was used to prepare a heated tobacco core material. The specific steps are as follows:

[0083] (1) placing 300 kg of coniferous wood pulp fiber and 700 kg of tobacco raw material in an extraction tank, adding 7000 kg of water thereto, extracting at 70° C. for 30 minutes, and filtering and separating after the extraction to obtain an extract and a filter residue;

[0084] (2) Add water to the filter residue in step (1) to control its concentration to 3.6% ± 0.3%, and then use a disc grinder to make pulp. The Schober beating degree of the pulp is 65 0 SR, a mixed slurry is prepared.

[0085] (3) The mixed slurry in step (2) is prepared into a carrier substrate according to the papermaking process of reconstituted tobacco leaves, and the basis weight of the carrier substrate is 50 g / m 2 ;

[0086] (4) The extract in step (1) is concentrated to obtain a concentrated solution with a solid content of 50%, 600 kg of the concentrated solution (whose solid content is 300 kg on an absolute dry basis) is taken, 180 kg of a smoke generating agent (composed of propylene glycol and glycerin in a mass ratio of 1:2), 15 kg of a fragrance raw material, and 5 kg of an anti-hygroscopic agent (composed of beeswax, cocoa butter and tamarind polysaccharide gum in a mass ratio of 1:1.5:1) are added to prepare a coating solution;

[0087] (5) The coating liquid prepared in step (4) is coated on the carrier substrate of step (3) according to the coating process of papermaking reconstituted tobacco to obtain a coating sample. During the coating process, the coating rate is controlled to be 50%. The absolute dry weight of the finished product after coating is 100 g / m 2 .

[0088] (6) Drying the coated sample prepared in step (5) to obtain a heated tobacco cigarette core material.

[0089] The test results of the physical indicators of the heated tobacco cigarette core material prepared in this comparative example are shown in Table 4. It can be seen from Table 4 that the physical indicators of the heated tobacco cigarette core material prepared in this comparative example are not as good as those in Example 1. Therefore, it can be seen that the heated tobacco cigarette core material prepared by the preparation method of the present invention is better.

[0090] Table 4 Core material physical index test results

[0091] Serial number project Test results 1 Transverse tensile strength (N / m) 173 2 Longitudinal tensile strength (N / m) 412 3 Hot water soluble matter content (%) 50.29 4 <![CDATA[Thermal conductivity (w / mk )]]> 0.0659

Claims

1. A method for preparing a heated tobacco cigarette core material, characterized in that: The specific steps include: (1) preparing ultrafine bamboo powder from the dried bamboo material; (2) mixing cellulose fibers with water to prepare cellulose fiber slurry; (3) mixing the ultrafine bamboo powder prepared in step (1) and the cellulose fiber slurry prepared in step (2) uniformly to prepare a mixed slurry; (4) preparing a carrier substrate from the mixed slurry prepared in step (3) according to a papermaking and papermaking forming process; (5) preparing ultrafine tobacco powder from tobacco leaf formula raw materials; (6) uniformly mixing the ultrafine smoke powder prepared in step (5) with a smoke generating agent, flavors and fragrances, an anti-hygroscopic agent, and water to prepare a coating liquid; (7) applying the coating solution prepared in step (6) onto the carrier substrate prepared in step (4) by a calender coating process to prepare a coating sample; (8) The coated sample prepared in step (7) is dried and rolled to obtain a heated tobacco cigarette core material.

2. The method for preparing a heated tobacco cigarette core material according to claim 1, characterized in that: In step (1), the bamboo material is the stalk of bamboo, the median particle size of the ultrafine bamboo powder is 69.28 μm to 23.00 μm, and the volume average diameter is 87.29 μm to 37.74 μm.

3. The method for preparing a heated tobacco cigarette core material according to claim 1, characterized in that: In step (2), the cellulose fiber is one or more of wood pulp, hemp pulp, cotton pulp, bamboo pulp, and straw pulp mixed in any proportion; the concentration of the pulp is controlled to be 3.6%±0.3%; the Schober beating degree of the cellulose fiber pulp is 50 0 SR~90 0 SR.

4. The method for preparing a heated tobacco cigarette core material according to claim 1, characterized in that: In step (3), the mass percentage of the superfine bamboo powder is 60% to 95%, the mass percentage of the cellulose fiber slurry is 5% to 40%, and the total mass percentage of the superfine bamboo powder and the cellulose fiber slurry is 100%.

5. The method for preparing a heated tobacco cigarette core material according to claim 1, characterized in that: The papermaking process in step (4) is one of the papermaking processes for cigarette paper, tipping paper, and papermaking process for reconstituted tobacco leaves; the dry basis weight of the prepared carrier substrate is 30 g / m 2 ~80g / m 2 .

6. The method for preparing a heated tobacco cigarette core material according to claim 1, characterized in that: The tobacco formula raw material in step (5) is one or more of tobacco raw materials, tobacco fragments, and tobacco dust mixed in any proportion.

7. The method for preparing a heated tobacco cigarette core material according to claim 1, characterized in that: The ultrafine smoke powder in step (5) has the following characteristics: a median particle size of 18.86 μm to 8.83 μm, and a volume average diameter of 33.93 μm to 13.29 μm.

8. The method for preparing a heated tobacco cigarette core material according to claim 1, characterized in that: In step (6), the superfine smoke powder is 50 to 80 parts; the smoke generating agent is 10 to 30 parts; the flavor and fragrance is 0 to 5 parts; the anti-hygroscopic agent is 0.05 to 3 parts; the smoke generating agent is one or more of polycarbon fatty alcohols such as propylene glycol, glycerol, mannitol, 1,3-propanediol, sorbitol and xylitol, and polycarbon fatty acids are combined in any proportion; the anti-hygroscopic agent is one or more of tamarind polysaccharide gum, beeswax, cocoa butter, and sodium carboxymethyl cellulose are combined in any proportion; the amount of water used is equal to the total mass of the superfine smoke powder, the smoke generating agent, the flavor and fragrance, and the anti-hygroscopic agent.

9. The method for preparing a heated tobacco cigarette core material according to claim 1, characterized in that: The coating rate in the coating process in step (7) is 50% to 70%, and double-sided coating or single-sided coating is adopted.

10. The method for preparing a heated tobacco cigarette core material according to claim 1, characterized in that: The absolute dry weight of the heated tobacco cigarette core material in step (8) is 60 g / m 2 ~200g / m 2 .

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