Manufacturing method of heating cigarette smoking set and heating cigarette smoking set

Abstract

The invention discloses a manufacturing method of a heating cigarette smoking set and the heating cigarette smoking set. The manufacturing method comprises the steps that carbon fiber cloth is prepared; carbon fiber cloth is used for manufacturing a carbon fiber shell of the heating cigarette smoking set; manufacturing a heating element; the heating element and the carbon fiber shell are assembled to heat the cigarette smoking set. According to the smoking set, the shell with the carbon fiber cloth can effectively shield external electromagnetic interference, meanwhile, electromagnetic signals in the smoking set are prevented from being leaked, and the smoking set has the advantages of being high in strength, attractive, light, resistant to abrasion and corrosion.

Description

Technical Field

[0001] The present application relates to the technical field of heated cigarette smoking articles, and more specifically, to a manufacturing method of heated cigarette smoking articles and heated cigarette smoking articles. Background Art

[0002] The shell of a heated cigarette smoking device usually has certain functions, such as protecting various complex electronic components inside, preventing external impurities such as dust and moisture from entering the smoking device, playing a certain auxiliary role in the heating process, and achieving functional integration and ease of operation.

[0003] The shell of heated cigarettes is mostly made of plastic, metal or a combination of the two. Plastic shells have the advantages of low cost, light weight, and good insulation, such as the common ABS plastic, which has good wear resistance and impact resistance; metal shells have better texture, high strength, and good heat dissipation performance, such as aluminum alloy shells, which are beautiful and durable.

[0004] However, the existing heated cigarette smoking device shell has weak resistance to external electromagnetic interference, and the heated cigarette smoking device has weak stability and reliability. Summary of the invention

[0005] The present application provides a manufacturing method of a heated cigarette smoking device and a heated cigarette smoking device. The shell with carbon fiber cloth can effectively shield external electromagnetic interference and prevent leakage of electromagnetic signals inside the smoking device. It has the characteristics of high strength, beautiful and light, wear resistance and corrosion resistance.

[0006] The present application provides a method for manufacturing a heated cigarette smoking article, comprising:

[0007] preparing carbon fiber cloth;

[0008] Using carbon fiber cloth to make a carbon fiber shell of a heated cigarette smoking device;

[0009] Making heating elements;

[0010] The heating element and the carbon fiber shell are used to assemble the heated cigarette smoking device.

[0011] Preferably, preparing the carbon fiber cloth specifically includes:

[0012] preparing carbon fiber raw materials;

[0013] Using carbon fiber raw materials to prepare carbon fiber yarn;

[0014] The carbon fiber yarns are woven to form a first carbon fiber cloth.

[0015] Preferably, preparing the carbon fiber cloth further comprises:

[0016] The first carbon fiber cloth is subjected to heat setting treatment to form a second carbon fiber cloth.

[0017] Preferably, preparing the carbon fiber raw material specifically includes:

[0018] preparing polyacrylonitrile precursor;

[0019] Under a preset pre-oxidation temperature and air atmosphere, the polyacrylonitrile precursor is subjected to a pre-oxidation reaction for a first preset time in an intermittent pre-oxidation box;

[0020] In an intermittent carbonization furnace, in a nitrogen atmosphere of a preset concentration, the pre-oxidized polyacrylonitrile precursor is subjected to preliminary carbonization and high-temperature carbonization in sequence;

[0021] At a first preset temperature, graphitizing the carbonized polyacrylonitrile precursor in a nitrogen atmosphere;

[0022] Surface treatment is performed on the graphitized polyacrylonitrile precursor;

[0023] The surface-treated polyacrylonitrile precursor is sized and curled to form carbon fiber raw materials.

[0024] Preferably, preparing polyacrylonitrile precursor comprises:

[0025] Adding polyacrylonitrile powder into dimethylformamide solution to prepare a spinning solution;

[0026] filtering and degassing the spinning solution;

[0027] preparing a coagulation bath, passing a spinning solution into the coagulation bath through a spinneret, and spinning to obtain nascent fibers;

[0028] The primary fibers are stretched and post-treated to obtain polyacrylonitrile precursor fibers.

[0029] Preferably, manufacturing the heating element specifically includes:

[0030] ablating the carbon fiber raw material at a second preset temperature for a second preset time, and then washing and drying to obtain a surface oxidized carbon fiber raw material;

[0031] Prepare electroplating solution;

[0032] The surface oxidized carbon fiber is used as the cathode and the copper sheet is used as the anode, and electroplating is performed in an electroplating solution. After electroplating, the carbon fiber is washed with deionized water to neutrality and dried in a vacuum oven to obtain copper-plated carbon fiber.

[0033] annealing the copper-coated carbon fiber;

[0034] The annealed copper-plated carbon fiber is used as a heating body to process a heating element; the heating element comprises an outer shell and a heating body at the end of the outer shell.

[0035] Preferably, the carbon fiber shell of the heated cigarette smoking device is made of carbon fiber cloth, which specifically includes:

[0036] Cut the carbon fiber cloth according to the shell mold and layup design requirements of the heated cigarette smoking device;

[0037] The cut carbon fiber cloth is impregnated into the prepared epoxy resin prepreg, wherein the mass ratio of epoxy resin: ethylenediamine: 2-methylimidazole is 100:10:1;

[0038] Laying the prepreg containing the carbon fiber cloth in the shell mold;

[0039] Casting the shell mold with carbon fiber cloth;

[0040] The shell mold is cured and cooled, and then the shell of the heated cigarette smoking article is taken out of the mold to form a carbon fiber shell.

[0041] The present application also provides a heated cigarette smoking device, comprising a carbon fiber shell and a heating element;

[0042] The carbon fiber shell comprises a main body and at least one layer of carbon fiber cloth wrapped on the outer surface of the main body;

[0043] A receiving groove for heating cigarettes is arranged on the carbon fiber shell, and a heating element is positioned on the groove bottom of the receiving groove.

[0044] Preferably, the heating element of the heating element is made of copper-plated carbon fiber material.

[0045] Preferably, the heating element comprises a housing and a heating body at an end of the housing.

[0046] Preferably, the housing is a quartz tube.

[0047] Preferably, the heated cigarette smoking article further comprises a battery, and the battery is positioned in the carbon fiber shell.

[0048] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0050] Figure 1 A flow chart of a method for manufacturing a heated cigarette smoking article provided in the present application;

[0051] Figure 2 A structural diagram of an embodiment of a heated cigarette smoking device shell provided in the present application;

[0052] Figure 3 A structural diagram of an embodiment of a heating element provided in the present application;

[0053] Figure 4 This is a structural diagram of an embodiment of the heated cigarette smoking device provided in this application. DETAILED DESCRIPTION

[0054] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0055] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0056] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0057] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0058] The present application provides a manufacturing method of a heated cigarette smoking device and a heated cigarette smoking device. The shell with carbon fiber cloth can effectively shield external electromagnetic interference and prevent leakage of electromagnetic signals inside the smoking device. It has the characteristics of high strength, beautiful and light, wear resistance and corrosion resistance.

[0059] like Figure 1 As shown, the manufacturing method of the heated cigarette smoking device provided in the present application comprises:

[0060] S110: preparing carbon fiber cloth.

[0061] S120: Using carbon fiber cloth to make a carbon fiber shell of a heated cigarette smoking device.

[0062] S130: Making a heating element.

[0063] S140: Assemble a heated cigarette smoking device using a heating element and a carbon fiber shell.

[0064] Among them, in S110, preparing the carbon fiber cloth specifically includes:

[0065] S1101: preparing carbon fiber raw materials.

[0066] As an embodiment, preparing carbon fiber raw material specifically includes:

[0067] P1: Preparation of polyacrylonitrile precursor.

[0068] As an embodiment, the present application adopts wet spinning to prepare polyacrylonitrile precursor. Specifically, the preparation of polyacrylonitrile precursor includes:

[0069] Q1: Add polyacrylonitrile powder into dimethylformamide solution to prepare a spinning solution.

[0070] Add polyacrylonitrile powder to the solvent and fully dissolve it under certain temperature conditions to prepare a spinning solution. When the concentration of the spinning solution is too high, the viscosity of the solution is too high, which is not conducive to spinning; when the concentration of the solution is too low, the fiber yield will be affected.

[0071] Based on the above, as an example, using dimethylformamide (DMF) as a solvent, accurately weigh 200 g of polyacrylonitrile powder, add it to 180 mL of DMF solvent, stir at a constant speed at 60°C to fully dissolve the polyacrylonitrile powder to prepare a spinning solution, and the resulting solution concentration is 15%.

[0072] Q2: Filter and degas the spinning solution.

[0073] In order to improve the quality of polyacrylonitrile precursor and prevent problems such as defects or strength loss, filters are needed to remove impurities and undissolved polymer particles in the spinning solution.

[0074] As an embodiment, a cartridge filter is used to filter the spinning solution, which can effectively remove tiny particles and impurities in the solution, has high filtration efficiency, and can achieve continuous filtration.

[0075] As an embodiment, the filter pore size of the cartridge filter is 3 μm.

[0076] The bubbles in the spinning solution will affect the quality of the raw silk, and the bubbles can be removed by vacuum degassing.

[0077] As an embodiment, the spinning solution is placed in a vacuum drying oven, and only the vacuum is turned on to allow the bubbles in the spinning solution to expand and escape, wherein the pressure is 100 Pa and the degassing time is about 10 hours.

[0078] Q3: Prepare a coagulation bath, pass the spinning solution into the coagulation bath through a spinneret, and spin to obtain nascent fibers.

[0079] Due to the different solvent properties of the coagulation bath and the spinning solution, the solvent in the spinning solution will diffuse into the coagulation bath according to the principle of like dissolves like, and the coagulant in the coagulation bath will diffuse into the spinning solution, so that the polymer in the spinning solution will gradually coagulate to form fibers.

[0080] As an example, water, Na 2 SO4 , ethanol as the main raw materials to prepare a coagulation bath. Use a measuring cylinder to accurately measure 270 mL of deionized water and pour it into a 500 mL beaker. Measure 15 mL of anhydrous ethanol and pour it into a beaker filled with water. Stir to mix the ethanol and water evenly. Use an electronic balance to accurately weigh 3.000 g of anhydrous sodium sulfate solid and slowly add it to the ethanol solution. Turn on the magnetic stirrer until the sodium sulfate is completely dissolved. The ratio of each component in the coagulation bath is water: sodium sulfate: ethanol = 90%: 5%: 5% (volume ratio). Refrigerate the prepared coagulation bath at 4°C for later use.

[0081] As an embodiment, the aperture of the spinneret is 0.05 mm, and the spinning solution after filtering and degassing is extruded through the spinneret to form a thin stream, which enters the above-mentioned coagulation bath to form nascent fibers.

[0082] Q4: The primary fiber is stretched and post-processed to obtain polyacrylonitrile raw fiber.

[0083] The strength of the as-spun fiber is relatively low and needs to be stretched. As an example, the fiber is stretched in a hot water bath at 90° C. at a stretching multiple of 4 and a stretching speed of 50 mm per minute to avoid fiber breakage due to excessive stretching speed.

[0084] As an embodiment, the post-treatment of the raw fiber includes washing and drying to remove the residual components of the coagulation bath on the surface. Specifically, the raw fiber is washed alternately in a 40°C cold tank and a 45°C hot tank, and then washed in a high-temperature washing device (temperature is 85°C), and the total washing and drafting multiple is controlled at 1.6 times. Finally, it is dried at 100°C for 12 hours to reduce the moisture content of the fiber to an appropriate range.

[0085] P2: Under a preset pre-oxidation temperature and air atmosphere, the polyacrylonitrile precursor is subjected to a pre-oxidation reaction for a first preset time in an intermittent pre-oxidation box.

[0086] The main purpose of pre-oxidation is to make the polyacrylonitrile molecular chain undergo cyclization, cross-linking and other reactions, thereby forming a thermally stable ladder structure inside the raw fiber.

[0087] As an example, in an intermittent pre-oxidation box, at a pre-oxidation temperature of 250° C. and in an air atmosphere, after about 3 hours of pre-oxidation reaction, the drafting multiple is 0.89 times, which can achieve a better pre-oxidation effect for polyacrylonitrile precursor to obtain heat-resistant and infusible fibers.

[0088] P3: In an intermittent carbonization furnace, the pre-oxidized polyacrylonitrile precursor is subjected to preliminary carbonization and high-temperature carbonization in sequence under a nitrogen atmosphere of a preset concentration.

[0089] Carbonization of polyacrylonitrile precursor is a key step in converting pre-oxidized polyacrylonitrile fiber into carbon fiber under high temperature inert atmosphere. The carbonization process mainly removes non-carbon elements (such as hydrogen, nitrogen, oxygen, etc.) in the fiber, while rearranging carbon atoms to form a highly ordered graphitized structure. Through carbonization, the carbon content of the fiber can be significantly increased, and the mechanical properties and thermal stability of the fiber can be enhanced, thereby obtaining high-performance carbon fiber.

[0090] As an example, in an intermittent carbonization furnace, in a nitrogen atmosphere with a concentration of 99.99%, the temperature is raised at a rate of 10°C / min to 600°C, and the polyacrylonitrile pre-oxidized silk is low-temperature carbonized for 1.5 hours to complete the initial carbonization. Then, the temperature is raised at a rate of 5°C / min to 1400°C, and high-temperature carbonization is performed for 1 hour, so that the performance of the carbon fiber reaches a higher level.

[0091] P4: graphitizing the carbonized polyacrylonitrile precursor in a nitrogen atmosphere at a first preset temperature.

[0092] Graphitization is an important high-temperature treatment process that can significantly change the structure and properties of fibers.

[0093] As an example, graphitization is performed at 2500° C. in a nitrogen atmosphere.

[0094] P5: Surface treatment of graphitized polyacrylonitrile precursor.

[0095] Surface treatment can increase the polar groups of carbon fibers, increase the surface area, improve the wettability and bonding with the resin matrix, and thus improve the performance of the composite material.

[0096] As an embodiment, during the surface treatment, the graphitized polyacrylonitrile filaments are oxidized at a preset ozone concentration (eg, 10 mg / L), reaction temperature (eg, 50° C.), and reaction time (eg, 1 hour).

[0097] P6: The surface treated polyacrylonitrile precursor is sized and curled to form carbon fiber raw materials.

[0098] Sizing can protect the carbon fiber from damage during subsequent processing and use, prevent mutual friction and wear between fibers, and bind the filaments in each tow, reduce fuzzing, and improve the processability of the fiber. Curled carbon fiber can also better fill the shape of the mold and improve the molding quality.

[0099] As an example, when sizing, 18 g of sizing agent is accurately weighed using a balance, 982 mL of water is measured using a measuring cylinder, and the weighed sizing agent is slowly added to a container filled with water, and a magnetic stirrer is continuously stirred until the sizing agent is completely dissolved to form a uniform solution, and a sizing agent aqueous solution with a concentration of 1.80% is prepared. Sizing is performed in the sizing agent solution and dried on a steam-heated roller at 150°C, and the sizing amount is 1.15%.

[0100] Then it was curled by roller with roller pressure of 0.4MPa and roller speed of 100r / min, so as to produce carbon fiber raw material with tensile strength of 5.6GPa, tensile modulus of 800GPa, elongation of 1.8% and density of 1.80g / cm³.

[0101] S1102: Prepare carbon fiber yarn using carbon fiber raw materials.

[0102] The carbon fiber raw material prepared above is subjected to an opening treatment to change it from a bundle state to a loose fiber state, and the fibers are combed into a fiber web arranged roughly in parallel by a combing device.

[0103] The combed fiber bundles are twisted to make the fibers embrace each other to form carbon fiber yarns with a certain strength and fineness.

[0104] S1103: Weaving the carbon fiber yarn to form a first carbon fiber cloth.

[0105] Knitted carbon fiber cloth has good flexibility and elasticity, and is suitable for applications that bend or fit complex shapes. Specifically, the carbon fiber yarn is installed on a loom for weaving. During the weaving process, the loom parameters are selected to have a warp density of 100 strands / cm, a weft density of 80 strands / cm, a warp tension of 40N, and a weft tension of 25N.

[0106] Preferably, preparing the carbon fiber cloth further comprises:

[0107] S1104: performing heat setting treatment on the first carbon fiber cloth to form a second carbon fiber cloth.

[0108] Specifically, during the heat setting treatment, the fiber and fabric are set at 250° C. for 1 hour to make the structure of the fiber and fabric more stable and reduce deformation during use.

[0109] In the above S120, the carbon fiber shell of the heated cigarette smoking device is made by using the carbon fiber cloth, which specifically includes:

[0110] S1201: Cut carbon fiber cloth according to the shell mold and layup design requirements of heated cigarette smoking devices.

[0111] Specifically, the three-dimensional model of the heated cigarette smoking device shell is designed according to the size, shape, function and appearance requirements of the heated cigarette smoking device. Then, the carbon fiber cloth with suitable size and shape is cut according to the structure and layer design requirements of the mold.

[0112] As an embodiment, the material of the mold is steel, aluminum alloy or fiberglass.

[0113] S1202: impregnating the cut carbon fiber cloth into the prepared epoxy resin prepreg, wherein the mass ratio of epoxy resin: ethylenediamine: 2-methylimidazole is 100:10:1.

[0114] S1203: Laying the prepreg containing the carbon fiber cloth in the shell mold.

[0115] Specifically, the prepreg is laid directly in the mold, and each layer must fit tightly together to avoid bubbles, wrinkles or gaps.

[0116] S1204: Casting the shell mold with the carbon fiber cloth.

[0117] S1205: solidify and cool the shell mold, and then remove the shell of the heated cigarette smoking device from the mold to form a carbon fiber shell. Thus, the carbon fiber shell includes a main body and at least one layer of carbon fiber cloth wrapped on the outer surface of the main body.

[0118] As an example, the mold is cured at 100°C and 3MPa for 3 hours. After the curing is completed, the mold is allowed to cool naturally to room temperature. After cooling, the mold is opened and the formed heated cigarette smoking device shell is taken out of the mold.

[0119] Understandably, the heated cigarette smoking device shell after demoulding needs to be subjected to surface treatments such as grinding and polishing to remove burrs, flash and unevenness on the surface and improve the appearance quality and smoothness of the shell. Secondary processing operations are also performed according to the design requirements of the heated cigarette smoking device shell.

[0120] Figure 2 The structure diagram of an embodiment of the heated cigarette smoking device shell is shown. In this embodiment, the secondary processing includes completing the processing of the mounting hole, the cigarette accommodating groove 11, the operation button 12, the indicator light 13 and other structures.

[0121] Carbon fiber has good conductivity, which can effectively shield external electromagnetic interference, prevent electromagnetic signal leakage inside the shell, and improve the stability and reliability of heated cigarette smoking utensils. In addition, carbon fiber has high strength and high modulus, so it has excellent strength and rigidity, can effectively resist external impact and deformation, can withstand a certain degree of collision and fall, and provide reliable protection for the internal components of the carbon fiber shell. In addition, the density of carbon fiber is only about 1 / 4 of that of steel, and the shell made of this material is light and easy to carry and use. Carbon fiber also has excellent properties such as high temperature resistance and chemical corrosion resistance, which improves the durability of heated cigarette smoking utensils.

[0122] Preferably, in the above S130, the heating element of the heating element is made of copper-plated carbon fiber material. The heating element of carbon fiber material has the characteristics of high wear resistance, high strength, anti-oxidation and corrosion resistance, fast heating speed, high conversion efficiency, etc. On this basis, copper-plated carbon fiber has high conductivity and high strength performance, and as a heating element, it can greatly improve the heating speed, conversion efficiency and durability.

[0123] Specifically, making the heating element includes:

[0124] S1301: ablate the carbon fiber raw material at a second preset temperature for a second preset time, and then clean and dry it to obtain a carbon fiber raw material with an oxidized surface.

[0125] As an embodiment, the carbon fiber raw material is ablated at 400-500° C. for 20-40 min, and then cleaned and dried to obtain a surface-oxidized carbon fiber raw material.

[0126] S1302: Prepare electroplating solution.

[0127] As an example, 50 g of copper sulfate, 100 g of sodium citrate, 2 g of sodium tartrate, and 0.4 g of sodium dodecyl sulfate are weighed and dissolved in 1 L of water, and stirred until fully dissolved to prepare an electroplating solution.

[0128] S1303: Using the surface oxidized carbon fiber as the cathode and the copper sheet as the anode, electroplating is performed in an electroplating solution, and after electroplating, the carbon fiber is washed with deionized water to neutrality and dried in a vacuum oven to obtain copper-plated carbon fiber.

[0129] As an embodiment, the temperature of the electroplating solution is 30-60° C., and the electroplating voltage is 4-8V.

[0130] S1304: annealing the copper-plated carbon fiber to obtain copper-plated carbon fiber with high conductivity and high strength.

[0131] S1305: Using the annealed copper-plated carbon fiber as a heating element to process a heating element.

[0132] Figure 3An embodiment of a heating element is shown. The heating element 20 includes a housing 21 and a heating body 22 at an end of the housing 21 .

[0133] In the above S140, as an embodiment, Figure 4 As shown, the assembled heated cigarette smoking device includes a carbon fiber shell 10 and a heating element 20. The carbon fiber shell 10 includes a main body and at least one layer of carbon fiber cloth wrapped on the outer surface of the main body. The carbon fiber shell 10 is provided with a receiving groove 11 for the heated cigarette, and the heating element 20 is positioned on the bottom of the receiving groove 11.

[0134] Preferably, the heating element 22 of the heating component 20 is made of the copper-plated carbon fiber material, and the heating element 22 is connected to an external power source via a nickel electrode.

[0135] As an embodiment, the housing 21 of the heating element 20 is a quartz tube.

[0136] As another embodiment, the heated cigarette smoking device further includes a battery 30 , and the battery 30 is positioned inside the carbon fiber shell 10 .

[0137] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A method for manufacturing a heated cigarette smoking device, characterized in that: include: preparing carbon fiber cloth; Using carbon fiber cloth to make a carbon fiber shell of a heated cigarette smoking device; Making heating elements; The heating element and the carbon fiber shell are used to assemble a heating cigarette smoking device.

2. The method for manufacturing a heated cigarette smoking article according to claim 1, characterized in that: The method comprises preparing carbon fiber cloth, specifically comprising: preparing carbon fiber raw materials; Using the carbon fiber raw material to prepare carbon fiber yarn; The carbon fiber yarns are used for weaving to form a first carbon fiber cloth.

3. The method for manufacturing a heated cigarette smoking article according to claim 2, characterized in that: The preparation of carbon fiber cloth also includes: The first carbon fiber cloth is subjected to heat setting treatment to form a second carbon fiber cloth.

4. The method for manufacturing a heated cigarette smoking article according to claim 2, characterized in that: The method comprises preparing carbon fiber raw materials, specifically comprising: preparing polyacrylonitrile precursor; Under a preset pre-oxidation temperature and air atmosphere, the polyacrylonitrile precursor is subjected to a pre-oxidation reaction for a first preset time in an intermittent pre-oxidation box; In an intermittent carbonization furnace, in a nitrogen atmosphere of a preset concentration, the pre-oxidized polyacrylonitrile precursor is subjected to preliminary carbonization and high-temperature carbonization in sequence; At a first preset temperature, graphitizing the carbonized polyacrylonitrile precursor in a nitrogen atmosphere; Surface treatment is performed on the graphitized polyacrylonitrile precursor; The surface-treated polyacrylonitrile precursor is sized and curled to form carbon fiber raw materials.

5. The method for manufacturing a heated cigarette smoking article according to claim 4, characterized in that: The method comprises preparing polyacrylonitrile precursor, specifically comprising: Adding polyacrylonitrile powder into dimethylformamide solution to prepare a spinning solution; filtering and degassing the spinning solution; preparing a coagulation bath, passing a spinning solution into the coagulation bath through a spinneret, and spinning to obtain nascent fibers; The primary fibers are stretched and post-treated to obtain polyacrylonitrile precursor fibers.

6. A heated cigarette smoking device, characterized in that: Including carbon fiber shell and heating element; The carbon fiber shell comprises a main body and at least one layer of carbon fiber cloth wrapped on the outer surface of the main body; The carbon fiber shell is provided with a receiving groove for heating cigarettes, and the heating element is positioned on the groove bottom of the receiving groove.

7. The heated cigarette smoking article according to claim 6, characterized in that: The heating element of the heating element is made of copper-plated carbon fiber material.

8. The heated cigarette smoking device according to claim 7, characterized in that: The heating element comprises a shell and a heating body at the end of the shell.

9. The heated cigarette smoking article according to claim 8, characterized in that: The shell is a quartz tube.

10. The heated cigarette smoking article according to claim 6, characterized in that: The heated cigarette smoking article further comprises a battery, and the battery is positioned inside the carbon fiber shell.

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