Heated cigarette, and low-retention hollow paper tube and method for manufacturing same

Abstract

The present disclosure relates to the technical field of heated tobacco, and provides a low-retention hollow paper tube for a heated cigarette. The low-retention hollow paper tube has a multi-layer structure, comprising: at least one low-retention layer and at least one heat-resistant layer, wherein the innermost layer of the multi-layer structure is the low-retention layer. The present disclosure also provides a method for manufacturing the low-retention hollow paper tube and a heated cigarette. The low-retention hollow paper tube of the present disclosure can reduce retention of aerosol on the inner wall of the paper tube, and can also prevent heat transfer to an acetate fiber filter section, thereby avoiding the problem of "lip burning".

Description

Heated cigarette, low-retention hollow paper tube and preparation method thereof

[0001] The present disclosure claims priority to Chinese Patent Application No. 202411001422.0, filed on July 25, 2024, entitled "A Hollow Paper Tube for Cooling Heated Cigarette and a Preparation Method Thereof", No. 202411210045.1, filed on August 30, 2024, entitled "A Fragrance-Enhanced Thick-Wall Paper Tube Filter and Application Thereof", No. 202510002455.5, filed on January 02, 2025, entitled "A Low-Retention Hollow Tube for Heated Cigarette and Application Thereof", No. 202510002422.0, filed on January 02, 2025, entitled "A Low-Retention High-Fragrance Hollow Tube for Heated Cigarette and Application Thereof", and No. 202510260213.6, filed on March 06, 2025, entitled "Heated Cigarette, Low-Retention Hollow Paper Tube and Preparation Method Thereof", all of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0002] The present disclosure relates to the field of heated tobacco, and in particular, to a heated cigarette, a low-retention hollow paper tube and a preparation method thereof. BACKGROUND

[0003] Currently, there is a problem of low aerosol smoke amount in heated cigarettes. According to research, the aerosol released by the heated tobacco rod is about 57% retained in the hollow section, about 28% retained in the acetate filter section, and only about 15% released for human body to inhale. Therefore, a heated cigarette that reduces aerosol retention is needed. SUMMARY

[0004] In view of this, in order to at least partially solve at least one of the above-mentioned technical problems, the present disclosure provides a heated cigarette, a low-retention hollow paper tube and a preparation method thereof.

[0005] According to an embodiment of one aspect of the present disclosure, a low-retention hollow paper tube is provided, having a multi-layer structure, comprising: at least one low-retention layer and at least one heat-resistant layer; wherein the innermost layer of the multi-layer structure is the low-retention layer.

[0006] In some embodiments, the inner wall surface of the low-retention layer is smooth, and the surface friction coefficient of the inner wall of the low-retention layer is less than 0.35 UOM.

[0007] According to an embodiment of another aspect of the present disclosure, a method for preparing a low-retention hollow paper tube is provided, comprising: forming a smooth agent coating layer on a paper surface to obtain a low-retention layer; doping aerogel powder material in raw paper pulp and papermaking to obtain a heat-resistant layer; and rolling the low-retention layer and the heat-resistant layer, wherein the innermost layer is the low-retention layer.

[0008] According to an embodiment of another aspect of the present disclosure, a method for preparing the above low-retention hollow paper tube is provided, comprising:

[0009] The low-retention layer is obtained by papermaking with raw materials containing wood pulp subjected to carboxymethylation modification treatment, then spraying a hygroscopic agent on the paper, and then drying and calendering treatment;

[0010] The phase change material containing polylactic acid is used as the heat-resistant layer, the cellulose paper with air permeability less than 10 CU is used as the support layer, and the cellulose paper with air permeability of 40 CU to 80 CU is used as the heat insulation layer;

[0011] The low-retention layer, the heat-resistant layer, the support layer, and the heat insulation layer are sequentially adhered and compounded from the inside to the outside by using an adhesive, and the low-retention hollow paper tube is obtained.

[0012] According to an embodiment of another aspect of the present disclosure, a heated cigarette is provided, comprising a low-retention hollow paper tube as a hollow cooling section.

[0013] According to an embodiment of the present disclosure, the low-retention hollow paper tube of the present disclosure can reduce the retention of aerosol in the inner wall of the paper tube, and can also prevent heat from being transmitted to the acetate filter section, thereby avoiding the problem of "burning lips". BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the present disclosure, but not limit the present disclosure.

[0015] FIG. 1 is a cross-sectional schematic view of a low-retention hollow paper tube according to an embodiment of the present disclosure;

[0016] FIG. 2 is a cross-sectional schematic view of a low-retention hollow paper tube according to another embodiment of the present disclosure; and

[0017] FIG. 3 is a cross-sectional schematic view of a low-retention hollow paper tube according to still another embodiment of the present disclosure.

[0018] Legend of reference signs: 1 - low-retention layer; 2 - heat-resistant layer; 3 - support layer; 4 - heat insulation layer. DETAILED DESCRIPTION

[0019] In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the present disclosure. However, it will be apparent to one skilled in the art that one or more embodiments can be practiced without these specific details. In other instances, well-known structures and features have not been described in detail in order to avoid obscuring aspects of the present disclosure.

[0020] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. As used herein, the term "includes" indicates the presence of the features, steps, operations, but does not exclude the presence or addition of one or more other features.

[0021] At present, the heating cigarette generally has the problem of low aerosol smoke amount, and most of the aerosol is trapped in the hollow section. In the implementation of the inventive concept of the present disclosure, it is found that there can be two reasons. On the one hand, the aerosol is condensed and deposited on the inner wall of the hollow paper tube; on the other hand, the aerosol is physically intercepted and adsorbed by the inner wall of the hollow paper tube in the process of continuous movement and collision. Among them, the water in the aerogel is mainly deposited on the inner wall of the hollow section by the action of heat diffusion and condensation; the glycerol is mainly physically intercepted on the inner wall of the hollow section by the action of airflow impact; the nicotine is affected by the two factors about 1:1.

[0022] Therefore, the inventor proposes a low-trapping hollow paper tube, which reduces the trapping of aerogel in the hollow section through the low-trapping layer and the heat-blocking layer therein.

[0023] FIG. 1 is a cross-sectional schematic view of a low-trapping hollow paper tube provided by an embodiment of the present disclosure.

[0024] Specifically, according to an embodiment of one aspect of the present disclosure, a low-trapping hollow paper tube for a heating cigarette is provided, which has a multi-layer structure including at least one low-trapping layer 1 and at least one heat-blocking layer, as shown in FIG. 1. The innermost layer of the multi-layer structure is the low-trapping layer.

[0025] In some embodiments, the inner wall surface of the low-trapping layer is smooth, and the surface friction coefficient of the inner wall of the low-trapping layer is less than 0.35 UOM.

[0026] In some embodiments, the low-trapping layer includes paper and a smoothing agent coating formed on the inner surface of the paper.

[0027] According to the embodiment of the present disclosure, the low-trapping layer obtained by forming a smoothing agent coating on the inner surface of the paper can increase the smoothness of the inner wall of the paper tube, reduce the physical interception and adsorption of the aerosol, and reduce the trapping of the aerosol on the inner wall of the paper tube; the heat-blocking layer on the outer side of the low-trapping layer can prevent the loss of heat inside the hollow paper tube, prevent the aerosol from being condensed and deposited on the inner wall of the hollow tube, further reduce the trapping of the aerosol on the inner wall of the paper tube, and also prevent the heat from being transmitted to the acetate filter section, thereby avoiding the problem of "burning lips".

[0028] According to an embodiment of the present disclosure, the smoothing agent comprises nanocellulose and / or carboxymethyl cellulose.

[0029] According to an embodiment of the present disclosure, the nanocellulose and the carboxymethyl cellulose are used to form a dense smooth layer (smoothing agent coating layer) on the surface of the paper, which is low in cost, has good water solubility, is convenient to use in production, and has high crystallinity and good mechanical properties, so as to improve the strength of the paper and prevent the penetration of gas and liquid.

[0030] According to an embodiment of the present disclosure, the heat-resistant layer comprises paper containing aerogel powder material.

[0031] According to an embodiment of the present disclosure, the aerogel powder material can comprise silicon aerogel powder, carbon aerogel powder, metal oxide aerogel powder, organic aerogel powder, etc. The addition of the aerogel powder material can improve the heat resistance of the paper, thereby reducing the condensation deposition of aerosol in the hollow paper tube.

[0032] According to an embodiment of another aspect of the present disclosure, a method for preparing a low-retention hollow paper tube is provided, comprising: forming a smoothing agent coating layer on the surface of the paper to obtain a low-retention layer; doping aerogel powder material in the raw paper pulp and making paper to obtain a heat-resistant layer; and rolling the low-retention layer and the heat-resistant layer, wherein the innermost layer is the low-retention layer.

[0033] According to an embodiment of the present disclosure, in the above method, the smoothing agent comprises nanocellulose and / or carboxymethyl cellulose, and the coating amount is 0.1 g·cm -2 -2 g·cm -2 , for example 0.3 g·cm -2 , 0.5 g·cm -2 , 1 g·cm -2 , 1.3 g·cm -2 , and 1.5 g·cm -2 , but is not limited to the values given.

[0034] According to an embodiment of the present disclosure, if the coating amount of the smoothing agent is too low, it is not conducive to reducing the retention of aerosol on the inner wall of the hollow paper tube; if the coating amount of the smoothing agent is too high, it will affect the physical properties such as hardness and resilience of the paper tube, and also increase the production cost.

[0035] According to an embodiment of the present disclosure, in the above method, the mass fraction of the aerogel powder material in the paper pulp is 15%-20%, for example 15%, 16%, 17%, 18%, 19%, 20%, but is not limited to the values given.

[0036] According to the embodiment of the present disclosure, if the mass ratio of the aerogel powder material in the paper pulp is too low, the heat resistance of the heat resistance layer cannot be improved; if the mass ratio of the aerogel powder material in the paper pulp is too high, the hardness and resilience of the paper tube will be affected, and the production cost will be increased.

[0037] According to the embodiment of the present disclosure, in the above method, the particle size of the aerogel powder material is 2-40 μm, for example, 2 μm, 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm and 25 μm, but not limited to the values.

[0038] According to the embodiment of the present disclosure, if the particle size of the aerogel powder material is too large, the retention rate during the preparation of the paper will be low, resulting in waste; if the particle size of the aerogel powder material is too small, the heat resistance of the heat resistance layer cannot be improved.

[0039] According to the embodiment of the present disclosure, in the above method, the smooth agent coating layer is formed on the surface of the paper to obtain a low retention layer, which comprises: providing a paper pulp, the paper pulp comprising plant fibers, a wet strength agent and a retention aid, wherein the plant fibers comprise hardwood pulp and softwood pulp; after the paper pulp is formed, a smooth agent coating layer is formed on the surface of the paper, and then the paper is dried to obtain a low retention layer.

[0040] According to the embodiment of the present disclosure, in the above method, the aerogel powder material is doped in the base paper pulp to prepare paper to obtain a heat resistance layer, which comprises: providing a paper pulp, the paper pulp comprising plant fibers, basalt fibers, a wet strength agent, a retention aid and an aerogel powder material, wherein the mass ratio of the plant fibers and the basalt fibers is about 10:1-2:1; the paper pulp is formed and dried to obtain a heat resistance layer.

[0041] According to the embodiment of the present disclosure, the plant fibers can comprise hardwood pulp and softwood pulp with a mass ratio of 4:6-5:5.

[0042] According to the embodiment of the present disclosure, the wet strength agent comprises a polyamide epoxy chloropropane resin, and the addition amount is 2%-6% of the mass of the pulp, for example, 2%, 3%, 4%, 5% and 6%, but not limited to the values.

[0043] According to the embodiment of the present disclosure, the retention aid comprises a cationic polyacrylamide, and the addition amount is 0.05%-2% of the mass of the pulp.

[0044] According to the embodiment of the present disclosure, the paper pulp forming comprises a long net papermaking process.

[0045] According to the embodiment of the present disclosure, after the paper is formed and pressed, drying and cutting are performed to obtain a paper tube base paper. The drying comprises: drying by using two groups of drying cylinders, wherein the pressure of the inner support roller of the drying cylinder of the first group of drying cylinders is 80 kg·cm -1~ 100 kg·cm -1 The drying cylinder temperature of the second group of drying cylinders is 110°C ~ 130°C, and the drying time is 10 min ~ 20 min. -1 ~ 60 kg·cm -1 The drying cylinder temperature of the second group of drying cylinders is 80°C ~ 100°C, and the drying time is 20 min ~ 30 min.

[0046] According to an embodiment of the second aspect of the present disclosure, a heating cigarette is provided, which comprises the low-retention hollow paper tube as described above as a hollow cooling section.

[0047] Fig. 2 is a cross-sectional view of a low-retention hollow paper tube according to another embodiment of the present disclosure.

[0048] In some embodiments, referring to Fig. 2, the low-retention hollow paper tube further comprises a support layer 3 located outside the heat-insulating layer 2.

[0049] In some embodiments, the low-retention layer 1 is made of paper doped with ceramic material or paper with a metal film on the surface. As a preferred solution, the ceramic material comprises alumina or / and silicon carbide, and the doping amount of the ceramic material in the paper is 20wt% ~ 60wt%. As a preferred solution, the metal film comprises aluminum foil, and the mass ratio of the metal film to the paper is 1:1 ~ 1:2. As a preferred solution, when the low-retention layer is made of paper doped with ceramic material, the inner surface of the low-retention layer is subjected to calendering treatment; when the low-retention layer is made of paper with a metal film on the surface, the inner surface of the low-retention layer is a metal film. The inner wall of the low-retention layer is smooth, which is not easy to adhere to aerosol, and has strong heat conduction performance, which can reduce the condensation and deposition of aerosol on the inner wall by using the heat of smoke. The mass fraction of the ceramic material in the paper is not less than 20%, and if the proportion is too low, the thermal conductivity coefficient will be low, which will cause the aerosol to easily condense on the surface. The mass fraction of the ceramic material in the paper is preferably not more than 60%, and if the mass fraction is too high, it will affect the molding of the paper. The paper of the low-retention layer is subjected to calendering treatment or the inner surface is a smooth metal film layer, so that the inner surface is smooth, which can reduce the retention of aerosol. The total grammage of the low-retention layer is not less than 40 g / cm 3 .

[0050] In some embodiments, the heat resistance layer 2 is made of inorganic thermal insulation material doped in paper or made of paper with a coating of phase change material on the surface. As a more preferred solution, the inorganic thermal insulation material includes glass fiber or / and rock wool; the doping amount of the inorganic thermal insulation material in the paper is 20wt%-40wt%. The coating thickness of the phase change material on the surface of the paper is 0.1mm-0.3mm. The heat resistance layer gives it the function of preventing heat transfer, thereby reducing the temperature of the side wall of the filter segment, reducing the risk of "burning lips", while being able to prevent the loss of heat in the hollow tube, maintaining the high temperature in the tube, and thereby reducing the condensation deposition of aerosol on the inner wall of the tube. Glass fiber or / and rock wool has good thermal insulation effect, and the phase change material can quickly absorb heat through phase change, such as polylactic acid. The total grammage of the paper of the heat resistance layer is not less than 40g / cm 3 .

[0051] In some embodiments, the support layer 3 is made of paper doped with basalt fiber. As a more preferred solution, the doping amount of basalt fiber is 20wt%-40wt%. The introduction of basalt fiber can give the hollow tube a certain hardness and elasticity, while basalt fiber has low thermal conductivity, which can further reduce the conduction of heat to the outer wall, thereby reducing the temperature of the side wall of the filter segment and reducing the risk of "burning lips". The total grammage of the paper of the support layer is not less than 40g / cm 3 .

[0052] In the embodiments of the present disclosure, the low-retention hollow tube for heated cigarettes has a three-layer structure, from the inside to the outside, in order, a low-retention layer 1, a heat resistance layer 2, and a support layer 3.

[0053] The three-layer structure of the hollow tube of the present disclosure is an ideal design, and from the inside to the outside, in order, a low-retention layer, a heat resistance layer, and a support layer, so that the functions of each layer can be fully exerted. The low-retention layer with thermal conductivity is designed in the inner layer, which can ensure that the tube wall has enough heat to reduce the retention effect on aerosol, while the inner side of the low-retention layer is smooth, which can reduce the retention effect on aerosol. The heat resistance layer has a heat insulation effect, which is designed in the middle layer, which can prevent heat conduction to the outside, ensure that the inner wall of the hollow tube has high temperature, and the outer wall has low temperature, thereby reducing the risk of "burning lips". The outermost support layer improves the hardness and elasticity of the hollow tube by introducing inorganic fibers, which plays a mechanical support role, and the inorganic fibers also further play a heat insulation role.

[0054] The present disclosure also provides a low-retention hollow tube for use in heated cigarettes, which is applied to heated cigarettes as a hollow cooling segment with low-retention function. The low-retention hollow tube replaces the conventional hollow tube for use in heated cigarettes, which can not only effectively reduce the retention amount of aerosol in the hollow tube, but also ensure that the temperature of the side wall of the filter segment is reduced and the risk of "burning lips" is reduced.

[0055] As a preferred solution, the hollow cooling section is butted with the acetate filter rod section to form a filter rod.

[0056] The hollow tube in the related art mainly plays a role of cooling, and therefore has a relatively large aerosol interception amount. The design of the low-interception hollow tube of the present disclosure has the following advantages: 1) the condensation deposition of aerosol on the inner wall of the tube and the physical interception and adsorption of aerosol by the inner wall of the hollow tube can be reduced; and 2) the normal cooling function can be ensured, and the risk of "burning lips" can be reduced. In summary, the hollow tube of the present disclosure can not only reduce the aerosol interception amount of the hollow tube, but also reduce the risk of "burning lips" through heat blocking.

[0057] FIG. 3 is a cross-sectional view of a low-interception hollow paper tube according to another embodiment of the present disclosure.

[0058] In some embodiments, referring to FIG. 3, the low-interception hollow paper tube further comprises, from the inside out, a support layer 3 and a thermal insulation layer 4 outside the heat blocking layer 2; wherein the low-interception layer (also referred to as the water absorption layer) 1 comprises a carboxymethylated cellulose material paper subjected to calendering treatment; the heat blocking layer (also referred to as the heat absorption layer) 2 comprises a phase change material containing polylactic acid; the support layer 3 comprises a cellulose paper with an air permeability of less than 10 CU; and the thermal insulation layer 4 comprises a cellulose paper with an air permeability of 40 CU to 80 CU.

[0059] Through the multi-layer composite design of the "low-interception layer-heat blocking layer-support layer-thermal insulation layer" of the hollow structure paper tube, the present disclosure can greatly reduce the amount of smoke intercepted while capturing water vapor by the low-interception layer, so that the smoke is fully cooled, and the problem of "burning lips" caused by the excessively high temperature of the smoke is avoided; and the heat generated by the inner water absorption layer is absorbed by the intermediate phase change heat blocking layer, the heat inside the paper tube is insulated from being conducted outward, the temperature of the outer lateral wall of the cigarette is significantly reduced, and the smoking experience of the consumer is improved in multiple aspects. In addition, the high-tightness cellulose paper is used as the support layer to improve the hardness and elasticity of the paper tube, so as to facilitate the implementation of the rolling process.

[0060] In some embodiments, the heat blocking layer 2 further comprises at least one of polyethylene glycol, vegetable wax, mineral wax, and synthetic wax.

[0061] In some embodiments, the low-interception layer 1 has a grammage of 20 g / m 2 to 80 g / m 2 and a thickness of 0.02 mm to 0.20 mm.

[0062] In some embodiments, the heat blocking layer 2 has a grammage of 40 g / m 2 to 100 g / m 2 and a thickness of 0.05 mm to 0.35 mm.

[0063] In some embodiments, the support layer 3 has a grammage of 20 g / m 2~ 80 g / m 2 The thickness of the low-retention layer is 0.01 mm to 0.15 mm.

[0064] In some embodiments, the grammage of the heat insulation layer 4 is 20 g / m 2 ~ 80 g / m 2 The thickness of the heat insulation layer is 0.02 mm to 0.20 mm.

[0065] The present disclosure also provides a method for preparing a heat cigarette cooling hollow paper tube. The method comprises the following steps: papermaking by using raw materials containing carboxymethylated modified wood pulp, then spraying a hygroscopic agent on the paper, and then drying and calendering the paper to obtain a low-retention layer; using a phase change material containing polylactic acid as a heat resistance layer, using cellulose paper with an air permeability of less than 10 CU as a support layer, and using cellulose paper with an air permeability of 40 CU to 80 CU as a heat insulation layer; and sequentially bonding and compounding the low-retention layer, the heat resistance layer, the support layer, and the heat insulation layer from the inside to the outside by using an adhesive, thereby obtaining the heat cigarette cooling hollow paper tube.

[0066] The present disclosure adjusts the amount of water-absorbing by adjusting the content of the carboxymethylated modified wood pulp and the grammage of the water-absorbing layer; improves the smoothness and thickness uniformity of the paper by calendering the paper; prevents the heat from spreading by absorbing the heat generated by the water-absorbing in the inner layer through the polylactic acid heat resistance layer; and increases the hardness and elasticity of the paper tube by adding a layer of high-tightness cellulose paper as a support layer between the heat resistance layer and the heat insulation layer, so as to facilitate the realization of the rolling process.

[0067] In some embodiments, the raw materials further contain unmodified wood pulp.

[0068] In some embodiments, the content of the unmodified wood pulp is not higher than 90wt% of the raw materials.

[0069] In some embodiments, the wood pulp includes coniferous wood pulp and / or broad-leaved wood pulp.

[0070] In some embodiments, the hygroscopic agent includes a lithium chloride solution and / or a glycerol aqueous solution.

[0071] In some embodiments, the mass concentration of the lithium chloride solution is 1wt% to 10wt%.

[0072] In some embodiments, the mass concentration of the glycerol aqueous solution is 40wt% to 60wt%.

[0073] In some embodiments, the spraying amount of the hygroscopic agent is 1 mg / cm 2 ~ 100 mg / cm 2 The hygroscopic agent can directly help to quickly capture water in a high-humidity environment, and controlling the spraying amount of the hygroscopic agent in a suitable range is conducive to improving the performance of the low-retention layer.

[0074] In some embodiments, the drying temperature is 90°C to 100°C.

[0075] In some embodiments, the content of polylactic acid is not less than 50 wt% of the phase change material.

[0076] In some embodiments, the phase change material further comprises at least one of polyethylene glycol, plant wax, mineral wax, and synthetic wax.

[0077] In some embodiments, the heat-resistant layer is a film, nonwoven fabric, or electrospun film made of a phase change material containing polylactic acid through hot pressing, meltblowing, or electrospinning.

[0078] In some embodiments, the density of the cellulose paper in the support layer is not less than 0.7 g / cm³. 3 The weight is 20g / m 2 ~80g / m 2 .

[0079] In some embodiments, the basis weight of the cellulose paper in the insulation layer is 20 g / m². 2 ~80g / m 2 .

[0080] In some embodiments, the adhesive includes at least one of sodium alginate, carboxymethyl cellulose, dextrin, and polyvinyl alcohol.

[0081] In some embodiments, the adhesive is applied between the layers of the low-resistance layer, the heat-insulating layer, the support layer, and the insulation layer.

[0082] In some embodiments, the adhesive is applied at a rate of 1 mg / cm³. 2 ~100mg / cm 2 .

[0083] In some embodiments, the paper tube is slit and then combined with the smoke-generating section and the filter section to obtain a heated non-combustible cigarette.

[0084] In the embodiments of this disclosure, the multi-layer composite design of the hollow paper tube consisting of a "low retention layer - heat-insulating layer - support layer - heat-insulating layer" can greatly reduce the amount of smoke trapped while achieving the capture of water vapor by the low retention layer, thus fully cooling the smoke. Furthermore, the polylactic acid heat-insulating layer absorbs the heat from the water absorption of the inner layer, preventing the heat inside the paper tube from being conducted outward, significantly reducing the temperature of the outer wall of the cigarette, and comprehensively improving the consumer's smoking experience.

[0085] In embodiments of this disclosure, high-density cellulose paper is used as a support layer to enhance the rigidity and elasticity of the paper tube, thereby facilitating the implementation of the winding process.

[0086] In the embodiments of this disclosure, the preparation method is simple, easy to operate, and low in cost, making it suitable for industrial production.

[0087] The present disclosure will be further described in detail below with reference to specific embodiments.

[0088] Example 1

[0089] The paper pulp, comprising plant fibers, including softwood pulp and hardwood pulp in a mass ratio of 5:5; the pulp is mixed and beaten to a freeness of 50°SR; 2% by mass of polyamide epichlorohydrin resin (wet strength agent) and 1% by mass of cationic polyacrylamide (retention aid) are added to obtain a composite pulp; an aqueous solution of carboxymethyl cellulose with a mass concentration of 1% is provided; after the composite pulp is formed by wire forming, the above-mentioned aqueous solution of carboxymethyl cellulose is coated on its surface at a coating amount of 2 g·cm³. -2 The above materials are dried using two sets of drying cylinders. The pressure of the rollers inside the first set of drying cylinders is 100 kg·cm². -1 The drying cylinder temperature is 130℃, and the drying time is 20 minutes. The pressure of the rollers inside the second set of drying cylinders is 60 kg·cm². -1 The drying cylinder temperature was 100℃, and the drying time was 30 minutes. After the above materials were slit, a low-reserve layer base paper was obtained with a basis weight of 47 g·cm³. -3 .

[0090] The pulp is provided, comprising plant fiber and basalt fiber in a mass ratio of 10:3, wherein the plant fiber comprises softwood pulp and hardwood pulp in a mass ratio of 5:5; the pulp is mixed and beaten to a freeness of 50°SR; 20% by mass of aerogel powder, 2% by mass of polyamide epichlorohydrin (wet strength agent), and 1% by mass of polyacrylamide (retention aid) are added to obtain a composite pulp; after the composite pulp is formed into paper, the above material is dried using two sets of drying cylinders, wherein the pressure of the rollers inside the first set of drying cylinders is 100 kg·cm. -1 The drying cylinder temperature is 130℃, and the drying time is 20 minutes. The pressure of the rollers inside the second set of drying cylinders is 60 kg·cm². -1 The drying cylinder temperature was 100℃, and the drying time was 30 minutes. The above material was then slit to obtain the heat-insulating base paper with a basis weight of 50 g·cm³. -3 .

[0091] The aforementioned low-retention layer and heat-insulating layer are spirally rolled to obtain a hollow paper tube, wherein the innermost layer is the low-retention layer.

[0092] Example 2

[0093] The difference from Example 1 is that in the preparation of the low-retention layer, the coating amount of the carboxymethyl cellulose aqueous solution is 1.5 g-cm -2 The basis weight of the low-retention layer base paper is 45 g-cm -3 ; in the preparation of the thermal resistance layer, the added amount of aerogel powder is 25% of the mass of the fibers, and the basis weight of the thermal resistance layer base paper is 45 g-cm -3 .

[0094] Comparative Example 1

[0095] The difference from Example 2 is that in the preparation of the low-retention layer, the coating amount of the carboxymethyl cellulose aqueous solution is 0.05 g-cm -2 ; in the preparation of the thermal resistance layer, the added amount of aerogel powder is 1% of the mass of the fibers.

[0096] Comparative Example 2

[0097] A pulp is provided, which includes plant fibers, wherein it includes softwood pulp and hardwood pulp in a mass ratio of 5:5; the pulp is mixed and beaten so that the beating degree of the pulp is 50°SR; a polyamide epichlorohydrin resin (wet strength agent) with a mass of 2% of the plant fibers and a cationic polyacrylamide (retention aid) with a mass of 1% of the plant fibers are added to obtain a composite pulp; after the composite pulp is formed by long net papermaking, the above material is dried by using two groups of drying cylinders, wherein the pressure of the inner support roll of the drying cylinder of the first group of drying cylinders is 100 kg-cm -1 , the cylinder temperature is 130°C, and the drying time is 20 min. The pressure of the inner support roll of the drying cylinder of the second group of drying cylinders is 60 kg-cm -1 , the cylinder temperature is 100°C, and the drying time is 30 min; after the above material is slitting, a base paper is obtained, and the basis weight is 64 g-cm -3 ; the base paper is spiral-wound to obtain a hollow paper tube.

[0098] The hollow paper tubes prepared in the examples and comparative examples are rolled into heated cigarettes with a circumference of 21 mm and a filter ventilation of 50%, and are smoked by using a smoking machine. The main components nicotine, moisture, and glycerol trapped in the hollow paper tubes are determined by gas chromatography according to the recommended method of CORESTA No. 84, and the results are shown in Table 1.

[0099] Table 1

[0100] According to Table 1, the trapping amounts of moisture, glycerol, and nicotine of Comparative Example 2 are higher than those of Examples 1, 2, and Comparative Example 1, which can prove that the hollow paper tube using a low-retention layer and a thermal resistance layer and having the low-retention layer in the innermost layer can significantly reduce the trapping of aerosol on the inner wall of the paper tube; the trapping amounts of moisture, glycerol, and nicotine of Comparative Example 1 are higher than those of Examples 1 and 2, which can prove that when the coating amount of the smoothing agent is 0.1-2 g-cm-2 The mass ratio of the aerogel powder material in the paper pulp is in the range of 15-25%, which can significantly reduce the amount of aerosol trapped in the inner wall of the paper tube and will not cause waste.

[0101] Example 3

[0102] 1) Low-trapping layer: a composite pulp is obtained by mixing and beating plant fibers (softwood pulp, hardwood pulp, mass ratio 5:5) (beating degree 50°SR), adding wet strength agent polyamide epichlorohydrin resin (2% of the mass of the fibers) and retention aid cationic polyacrylamide (1% of the mass of the fibers); after long net papermaking and drying (two groups of drying cylinders are used for drying, wherein the pressure of the inner support roll of the drying cylinder of the first group of drying cylinders is 100 kg / cm, the drying cylinder temperature is 130°C, and the drying time is 20 min; the pressure of the inner support roll of the drying cylinder of the second group of drying cylinders is 60 kg / cm, the drying cylinder temperature is 100°C, and the drying time is 30 min), and after cutting, a hollow paper tube base paper is obtained. The aluminum foil is transferred to the surface of the base paper by transfer, and the base paper has a grammage of 37 g / cm 3 , and the total grammage after compounding is 74 g / cm 3 .

[0103] 2) Heat-resistant layer: a composite pulp is obtained by mixing and beating plant fibers (softwood pulp, hardwood pulp, mass ratio 5:5) and glass fibers (accounting for 30% of the plant fibers) (beating degree 50°SR), adding wet strength agent polyamide epichlorohydrin resin (2% of the mass of the fibers) and retention aid cationic polyacrylamide (1% of the mass of the fibers); after long net papermaking and drying (two groups of drying cylinders are used for drying, wherein the pressure of the inner support roll of the drying cylinder of the first group of drying cylinders is 100 kg / cm, the drying cylinder temperature is 130°C, and the drying time is 20 min; the pressure of the inner support roll of the drying cylinder of the second group of drying cylinders is 60 kg / cm, the drying cylinder temperature is 100°C, and the drying time is 30 min), and after cutting, a hollow paper tube heat-resistant layer base paper is obtained, with a grammage of 50 g / cm 3 .

[0104] 3) Support layer: a composite pulp is obtained by mixing and beating plant fibers (softwood pulp, hardwood pulp, mass ratio 5:5) and basalt fibers (accounting for 30% of the plant fibers) (beating degree 50°SR), adding wet strength agent polyamide epichlorohydrin resin (2% of the mass of the fibers) and retention aid cationic polyacrylamide (1% of the mass of the fibers); after long net papermaking and drying (two groups of drying cylinders are used for drying, wherein the pressure of the inner support roll of the drying cylinder of the first group of drying cylinders is 100 kg / cm, the drying cylinder temperature is 130°C, and the drying time is 20 min; the pressure of the inner support roll of the drying cylinder of the second group of drying cylinders is 60 kg / cm, the drying cylinder temperature is 100°C, and the drying time is 30 min), and after cutting, a hollow paper tube support layer base paper is obtained, with a grammage of 50 g / cm3 .

[0105] 4) Composite: The low retention layer, thermal barrier layer and support layer are spiral formed and rolled into a hollow tube.

[0106] Example 4

[0107] 1) Low retention layer: The plant fiber (softwood pulp, hardwood pulp, mass ratio 5:5) is mixed and beaten (beating degree 50°SR), and then wet strength agent polyamide epichlorohydrin resin (2% of the fiber mass), retention aid cationic polyacrylamide (1% of the fiber mass) and aluminum oxide powder (25% of the fiber mass) are added to obtain a composite slurry; after long net papermaking and drying (two groups of drying cylinders are used for drying, wherein the pressure of the inner support roll of the first group of drying cylinders is 100 kg / cm, the drying cylinder temperature is 130°C, and the drying time is 20 min; the pressure of the inner support roll of the second group of drying cylinders is 60 kg / cm, the drying cylinder temperature is 100°C, and the drying time is 30 min), and after cutting, a hollow paper tube raw paper is obtained. The original paper is polished to ensure the smoothness of the surface, and the total grammage is 64 g / cm 3 .

[0108] 2) Thermal barrier layer: The plant fiber (softwood pulp, hardwood pulp, mass ratio 5:5) is mixed and beaten (beating degree 50°SR) with rock wool (25% of the plant fiber), and then wet strength agent polyamide epichlorohydrin resin (2% of the fiber mass) and retention aid cationic polyacrylamide (1% of the fiber mass) are added to obtain a composite slurry; after long net papermaking and drying (two groups of drying cylinders are used for drying, wherein the pressure of the inner support roll of the first group of drying cylinders is 100 kg / cm, the drying cylinder temperature is 130°C, and the drying time is 20 min; the pressure of the inner support roll of the second group of drying cylinders is 60 kg / cm, the drying cylinder temperature is 100°C, and the drying time is 30 min), and after cutting, a hollow paper tube thermal barrier layer raw paper is obtained, with a grammage of 50 g / cm 3 .

[0109] 3) Support layer: The plant fiber (softwood pulp, hardwood pulp, mass ratio 5:5) is mixed and beaten (beating degree 50°SR) with basalt fiber (30% of the plant fiber), and then wet strength agent polyamide epichlorohydrin resin (2% of the fiber mass) and retention aid cationic polyacrylamide (1% of the fiber mass) are added to obtain a composite slurry; after long net papermaking and drying (two groups of drying cylinders are used for drying, wherein the pressure of the inner support roll of the first group of drying cylinders is 100 kg / cm, the drying cylinder temperature is 130°C, and the drying time is 20 min; the pressure of the inner support roll of the second group of drying cylinders is 60 kg / cm, the drying cylinder temperature is 100°C, and the drying time is 30 min), and after cutting, a hollow paper tube support layer raw paper is obtained, with a grammage of 50 g / cm 3 .

[0110] 4) Composite: the low retention layer, thermal barrier layer and support layer are spiral formed into a hollow tube.

[0111] Comparative Example 3

[0112] After mixing and beating (beating degree 50°SR) of plant fibers (softwood pulp, hardwood pulp, mass ratio 5:5), wet strength agent polyamide epoxy chloropropane resin (2% of fiber mass) and retention aid cationic polyacrylamide (1% of fiber mass) are added to obtain a composite slurry; after long net casting and drying (two groups of drying cylinders are used for drying, wherein the pressure of the inner support roll of the first group of drying cylinders is 100 kg / cm, the drying cylinder temperature is 130°C, and the drying time is 20 min; the pressure of the inner support roll of the second group of drying cylinders is 60 kg / cm, the drying cylinder temperature is 100°C, and the drying time is 30 min), and after cutting, a hollow paper tube base paper with a grammage of 64 g / cm 3 is obtained, which is spiral formed into a hollow paper tube.

[0113] The prepared hollow tube is detected in the following aspects:

[0114] 1. The hardness of the hollow paper tube is detected according to the method of GB / T22838 “Determination of Physical Properties of Cigarettes and Filter Rods”;

[0115] 2. The prepared hollow tube is combined with a cellulose acetate filter segment and then combined with a tobacco segment to form a heated cigarette (cigarette information: total cigarette length 71 mm, cellulose acetate filter segment length 13 mm, hollow tube length 28 mm, tobacco segment length 30 mm, circumference 21 mm, filter ventilation 50%), and after smoking with a smoking machine, the main components including nicotine, moisture and glycerol retained by the hollow tube are determined by gas chromatography. The determination method is according to the CORESTA No. 84 recommended method.

[0116] Table 2 Comparison of retention data of examples and comparative examples

[0117] Example 5

[0118] A heated but not burning cigarette cooling hollow paper tube, comprising the following preparation steps:

[0119] (1) Selecting bleached softwood pulp containing carboxymethyl (-CH2COOH or -CH2 COO - ) modified by carboxymethylation, mixing the paper pulp with 60wt% unmodified softwood pulp at a total amount of 40wt% to make paper as a low retention layer, with a grammage of 40g / m 2 .

[0120] (2) Spraying the paper obtained in step (1) with a 10% lithium chloride solution as a hygroscopic agent and drying at 100°C, with the coating amount controlled to 10 mg / cm 2 .

[0121] (3) Calendering the paper to improve the smoothness and thickness uniformity of the paper, with a low retention layer thickness of 0.07 mm.

[0122] (4) The heat-resistant layer is a film prepared by hot-pressing a polylactic acid phase change material, wherein the thickness of the heat-resistant layer is 0.05 mm and the grammage is 63 g / m 2 .

[0123] (5) The support layer is a cellulose paper with a density of 0.86 g / cm 3 , a gas permeability of 5 CU, a thickness of 0.05 mm, and a grammage of 43 g / m 2 .

[0124] (6) The heat-insulating layer is a common cellulose paper with a gas permeability of 60 CU, a thickness of 0.10 mm, and a grammage of 50 g / m 2 .

[0125] (7) The above four layers are sequentially compounded from the inside out in the order of "low retention layer-heat-resistant layer-support layer-heat-insulating layer", with carboxymethyl cellulose as an adhesive auxiliary adhesive coated between the layers, with a coating amount of 10 mg / cm 2 , to obtain a cooling hollow paper tube.

[0126] According to the desired cigarette size, the paper tube is cut and combined with the smoking segment and the filter segment to obtain a heat-not-burn cigarette. According to the standard specified cigarette smoking model, the mainstream smoke temperature and the cigarette side wall temperature at the end of the second puff are measured, 30 cigarettes are measured and the average value is calculated, and the measurement results are shown in Table 3.

[0127] Example 6

[0128] A heat-not-burn cigarette cooling hollow paper tube, comprising the following steps:

[0129] (1) Selecting a bleached broadleaf wood pulp containing carboxymethyl (-CH2COOH or -CH2 COO - ) modified by carboxymethylation, mixing the paper pulp at a total amount of 50 wt% with 50 wt% unmodified broadleaf wood pulp to make paper as a low retention layer, with a grammage of 30 g / m 2 .

[0130] (2) Spraying the paper obtained in step (1) with a 50% glycerol aqueous solution as a hygroscopic agent and drying at 95°C, with the coating amount controlled to 5 mg / cm 2 .

[0131] (3) The paper is calendered by a calender to improve the smoothness and thickness uniformity of the paper, and the low retention layer has a thickness of 0.05 mm.

[0132] (4) The heat-resistant layer is mainly composed of phase change material polylactic acid, polylactic acid and polyethylene glycol are mixed and dissolved into an electrospinning solvent at a mass ratio of 8:2, and a polylactic acid-polyethylene glycol electrospinning composite film is prepared by electrospinning technology, the thickness of the heat-resistant layer is 0.10 mm, and the grammage is 60 g / m 2 .

[0133] (5) The support layer is cellulose paper with a density of 0.9 g / cm 3 , and a gas permeability of 1 CU, the thickness of the support layer is 0.03 mm, and the grammage is 27 g / m 2 .

[0134] (6) The heat insulation layer is common cellulose paper with a gas permeability of 70 CU, the thickness of the heat insulation layer is 0.13 mm, and the grammage is 60 g / m 2 .

[0135] (7) The above four layers are sequentially compounded from the inside out according to "low retention layer-heat-resistant layer-support layer-heat insulation layer", and sodium alginate is coated as an adhesive auxiliary adhesive between the layers, the coating amount is 15 mg / cm 2 , and finally a cooling hollow paper tube is obtained.

[0136] According to the desired cigarette size, the paper tube is cut and compounded with the smoking segment and the filter segment to obtain a heat-not-burn cigarette. According to the standard specified cigarette smoking model, simulate smoking, measure the mainstream smoke temperature and the cigarette side wall temperature at the end of the second puff, measure 30 and calculate the average value, and the measurement results are shown in Table 3.

[0137] Example 7

[0138] A heat-not-burn cigarette cooling hollow paper tube, comprising the following steps:

[0139] (1) Selecting carboxymethylated bleached coniferous pulp and bleached broadleaf pulp containing carboxymethyl (-CH2COOH or -CH2 COO - ) mixed pulp at a mass ratio of 1:1, mixing the paper pulp at a total amount of 80wt% with 20wt% unmodified coniferous pulp and broadleaf pulp (1:1 mixed pulp) to make paper as a low retention layer, and the grammage is 25 g / m 2 .

[0140] (2) The paper obtained in step (1) is sprayed with a 50% glycerol aqueous solution and dried at 90°C, and the coating amount is controlled at 2 mg / cm 2 .

[0141] (3) The paper is calendered by a calender to improve the smoothness and thickness uniformity of the paper, and the low-retention layer has a thickness of 0.04 mm.

[0142] (4) The heat-blocking layer is mainly composed of phase change material polylactic acid, polylactic acid particles and paraffin particles (a mineral wax) are mixed in a mass ratio of 7:3, and a polylactic acid-paraffin composite non-woven fabric is prepared by a melt-blown process, the heat-blocking layer has a thickness of 0.20 mm and a grammage of 55 g / m 2 .

[0143] (5) The support layer is cellulose paper with a density of 0.97 g / cm 3 , a gas permeability of 0 CU, a thickness of 0.03 mm, and a grammage of 29 g / m 2 .

[0144] (6) The heat-insulating layer is common cellulose paper with a gas permeability of 80 CU, a thickness of 0.16 mm, and a grammage of 70 g / m 2 .

[0145] (7) The above four layers are sequentially compounded from the inside out in the order of "low-retention layer-heat-blocking layer-support layer-heat-insulating layer", and dextrin is coated as an adhesive auxiliary adhesive between the layers, the coating amount is 20 mg / cm 2 , and finally a cooling hollow paper tube is obtained.

[0146] (8) According to the desired cigarette size, the paper tube is cut and combined with the smoking segment and the filter segment to obtain the heat-not-burn cigarette.

[0147] According to the desired cigarette size, the paper tube is cut and combined with the smoking segment and the filter segment to obtain the heat-not-burn cigarette. Simulated smoking is carried out according to the standard specified cigarette smoking model, the mainstream smoke temperature and the cigarette side wall temperature at the end of the second puff are measured, 30 cigarettes are measured and the average value is calculated, and the measurement results are shown in Table 3.

[0148] Comparative Example 4

[0149] (1) Unmodified softwood pulp and hardwood pulp (1:1 mixed pulp) are mixed to prepare paper as a low-retention layer, and the grammage is 35 g / m 2 .

[0150] (2) The paper obtained in step (1) is sprayed with a hygroscopic agent 10% lithium chloride solution and dried at 95°C, and the coating amount is controlled at 2 mg / cm 2 .

[0151] (3) The paper is calendered by a calender to improve the smoothness and thickness uniformity of the paper, and the low-retention layer has a thickness of 0.05 mm.

[0152] (4) The thermal resistance layer is made of polylactic acid as the main component of phase change material, and is prepared into polylactic acid non-woven fabric by melt blowing process. The thickness of the thermal resistance layer is 0.18 mm, and the grammage is 52 g / m 2 .

[0153] (5) The support layer is cellulose paper with a density of 0.83 g / cm 3 , and a gas permeability of 80 CU. The thickness of the support layer is 0.03 mm, and the grammage is 25 g / m 2 .

[0154] (6) The thermal insulation layer is common cellulose paper with a gas permeability of 80 CU. The thickness of the thermal insulation layer is 0.15 mm, and the grammage is 50 g / m 2 .

[0155] (7) The above four layers of materials are sequentially compounded from the inside out according to the order of "low retention layer-thermal resistance layer-support layer-thermal insulation layer". Paste is coated between the layers as an adhesive auxiliary to aid adhesion. The coating amount is 10 mg / cm 2 , and finally a cooling hollow paper tube is obtained.

[0156] (8) According to the desired cigarette size, the paper tube is cut and combined with the smoking segment and the filter segment to obtain the heat-not-burn cigarette.

[0157] According to the desired cigarette size, the paper tube is cut and combined with the smoking segment and the filter segment to obtain the heat-not-burn cigarette. Simulated smoking is carried out according to the standard specified cigarette smoking model. The mainstream smoke temperature and the cigarette side wall temperature at the end of the second puff are measured. 30 cigarettes are measured and the average value is calculated. The measurement results are shown in Table 3.

[0158] Comparative Example 5

[0159] The same heat-not-burn cigarette as that of the company.

[0160] (1) Bleached coniferous pulp and bleached broadleaf pulp containing carboxymethyl groups (-CH2COOH or -CH2COO - ) modified by carboxymethylation (mass ratio of 1:1 mixed pulp) are selected. The paper pulp is mixed with 50wt% unmodified coniferous pulp and broadleaf pulp (1:1 mixed pulp) at a ratio of 50wt% to make paper, which is used as the low retention layer, with a grammage of 30 g / m 2 .

[0161] (2) The paper obtained in step (1) is sprayed with 50% glycerol aqueous solution as a moisture absorbent and dried at 95°C. The coating amount is controlled at 3 mg / cm 2 .

[0162] (3) The paper is calendered by a calender to improve the smoothness and thickness uniformity of the paper. The thickness of the low retention layer is 0.04 mm.

[0163] (4) The thermal resistance layer is made of non-phase change material polypropylene as the main component, and is prepared into a non-woven fabric by a melt-blowing process. The thickness of the thermal resistance layer is 0.20 mm, and the grammage is 60 g / m 2 .

[0164] (5) The support layer is cellulose paper with a density of 0.90 g / cm 3 , a gas permeability of 80 CU, and a thickness of 0.03 mm and a grammage of 27 g / m 2 .

[0165] (6) The thermal insulation layer is common cellulose paper with a gas permeability of 80 CU, and a thickness of 0.16 mm and a grammage of 58 g / m 2 .

[0166] (7) The above four layers of materials are sequentially compounded from the inside out in the order of “low retention layer-thermal resistance layer-support layer-thermal insulation layer”, and sodium alginate is coated between the layers as an adhesive auxiliary adhesive, with a coating amount of 15 mg / cm 2 , to obtain the temperature-reducing hollow paper tube.

[0167] (8) According to the desired cigarette size, the paper tube is cut and combined with the smoking segment and the filter segment to obtain the heat-not-burn cigarette.

[0168] According to the desired cigarette size, the paper tube is cut and combined with the smoking segment and the filter segment to obtain the heat-not-burn cigarette. Simulated smoking is carried out according to the standard specified cigarette smoking model, the mainstream smoke temperature and the cigarette side wall temperature at the end of the second puff are measured, 30 cigarettes are measured and the average value is calculated, and the measurement results are shown in Table 3.

[0169] Table 3

[0170] As can be seen from the results in Table 1, the mainstream smoke temperature and the cigarette side wall temperature of the heat-not-burn cigarette prepared by using the temperature-reducing hollow paper tube of the present disclosure are significantly lower than those of the ordinary heat-not-burn cigarette.

[0171] The specific embodiments of the present disclosure described above do not constitute a limitation on the protection scope of the present disclosure. Any various other corresponding changes and modifications made according to the technical concept of the present disclosure shall be included in the protection scope of the claims of the present disclosure.

Claims

1. A low retention hollow paper tube for heating a cigarette, having a multi-layer structure, wherein, The low-retention hollow paper tube comprises: at least one low-retention layer and at least one thermal resistance layer; wherein the innermost layer of the multi-layer structure is the low-retention layer.

2. The low retention hollow paper tube according to claim 1, wherein, The inner wall surface of the low-retention layer is smooth, and the surface friction coefficient of the inner wall of the low-retention layer is less than 0.35 UOM.

3. The low retention hollow paper tube according to claim 1, wherein, The low-retention layer comprises paper and a smooth agent coating layer formed on the inner surface of the paper.

4. The low retention hollow paper tube according to claim 3, wherein, The smooth agent comprises nanocellulose and / or carboxymethyl cellulose.

5. The low retention hollow paper tube according to claim 3, wherein, The thermal resistance layer comprises paper containing aerogel powder material.

6. The low retention hollow paper tube according to claim 1, wherein, Further comprising a support layer on the outer side of the thermal resistance layer.

7. The low-retention hollow paper tube of claim 6, wherein, The low-retention layer is composed of paper doped with ceramic material or paper with a metal film on the surface.

8. The low-retention hollow paper tube according to claim 7, wherein, The ceramic material comprises alumina or / and silicon carbide, The doping amount of the ceramic material in the paper is 20wt%-60wt%; The metal film comprises aluminum foil, and the mass ratio of the metal film to the paper is 1:1-1:

2.

9. The low-retention hollow paper tube of claim 7, wherein, When the low-retention layer is composed of paper doped with ceramic material, the inner surface is subjected to calendering treatment; When the low-retention layer is composed of paper with a metal plating film on the surface, the inner surface is a metal film.

10. The low-retention hollow paper tube of claim 6, wherein, The thermal resistance layer is composed of inorganic thermal insulation material doped in paper or paper with a phase change material coating layer on the surface.

11. The low-retention hollow paper tube of claim 10, wherein, The inorganic thermal insulation material comprises glass fiber or / and rock wool; The doping amount of the inorganic thermal insulation material in the paper is 20wt%-40wt%; The phase change material comprises polylactic acid; The coating thickness of the phase change material on the surface of the paper is 0.1mm-0.3mm.

12. The low-retention hollow paper tube of claim 6, wherein, The support layer is composed of paper doped with basalt fiber.

13. The low-retention hollow paper tube of claim 12, wherein, The doping amount of the basalt fiber is 20wt%-40wt%.

14. The low-retention hollow paper tube of claim 1, wherein, The low-retention hollow paper tube further comprises a support layer and a thermal insulation layer on the outer side of the thermal resistance layer; The low-retention layer comprises paper containing carboxymethylated cellulose material subjected to calendering treatment; The thermal resistance layer is a phase change material containing polylactic acid; The support layer comprises cellulose paper with air permeability less than 10CU; The thermal insulation layer comprises cellulose paper with air permeability of 40CU-80CU.

15. The low-retention hollow paper tube of claim 14, wherein, The thermal resistance layer further comprises at least one of polyethylene glycol, organic ester, vegetable wax, beeswax, mineral wax, and synthetic wax.

16. The low-retention hollow paper tube according to claim 14 or 15, wherein, The low retention layer has a grammage of 20 g / m 2 ~ 80 g / m 2 ; The basis weight of the heat resistance layer is 40 g / m 2 ~ 100 g / m 2 ; The support layer has a grammage of 20 g / m 2 ~ 80 g / m 2 ; The thermal barrier layer has a grammage of 20 g / m 2 ~ 80 g / m 2 .

17. A method for preparing the low-retention hollow paper tube according to any one of claims 3-5, comprising: forming a smooth agent coating layer on the surface of the paper to obtain a low-retention layer; doping aerogel powder material in the raw paper pulp and papermaking to obtain a thermal resistance layer; rolling the low-retention layer and the thermal resistance layer, wherein the innermost layer is the low-retention layer.

18. The method of claim 17, wherein, The smooth agent comprises nanocellulose and / or carboxymethyl cellulose, The coating amount thereof is 0.1 g-cm -2 ~ 2 g-cm -2 .

19. The method of claim 17, wherein, The mass fraction of the aerogel powder material in the paper pulp is 15%-20%.

20. The method of claim 17, wherein, The particle size of the aerogel powder material is 2μm-40μm.

21. The method of claim 17, wherein, Forming a smooth agent coating layer on the surface of the paper to obtain a low-retention layer comprises: providing paper pulp comprising plant fiber, wet strength agent, and retention aid, wherein the plant fiber comprises broadleaf wood pulp and coniferous wood pulp; After forming treatment of the paper pulp, a smooth agent coating layer is formed on the surface thereof, and then drying treatment is performed to obtain the low-retention layer.

22. The method of claim 17, wherein, The aerogel powder material is doped in the raw paper pulp to make paper, and the heat-resistant layer is obtained by: The paper pulp is provided, and the paper pulp comprises plant fibers, basalt fibers, wet strength agents, retention aids, and aerogel powder materials, wherein the mass ratio of the plant fibers and the basalt fibers is 10:1-2:

1. The paper pulp is formed and dried to obtain the heat-resistant layer.

23. A method of making a low-retention hollow paper tube as defined in any one of claims 14 to 16, wherein, The low-retention layer is obtained by: The phase change material containing polylactic acid is used as the heat-resistant layer, the cellulose paper with an air permeability of less than 10 CU is used as the support layer, and the cellulose paper with an air permeability of 40 CU-80 CU is used as the heat-insulating layer. The low-retention layer, the heat-resistant layer, the support layer, and the heat-insulating layer are sequentially adhered and compounded from the inside to the outside by using the adhesive, and the heat-insulating cigarette is obtained. The raw material further comprises unmodified wood pulp.

24. The method of claim 23, wherein, The content of the unmodified wood pulp is not higher than 90wt% of the raw material. The wood pulp comprises coniferous wood pulp and / or broad-leaved wood pulp.

25. The method of claim 23 or 24, wherein, 26. The method of claim 23, wherein, The moisture absorbing agent includes a lithium chloride solution and / or a glycerin aqueous solution; the spraying amount of the moisture absorbing agent is 1 mg / cm 2 ~ 100 mg / cm 2 . The content of the polylactic acid is not less than 50wt% of the phase change material. The phase change material further comprises at least one of polyethylene glycol, vegetable wax, mineral wax, and synthetic wax.

27. The method of claim 23 or 26, wherein, The heat-resistant layer is a film, non-woven fabric, or electrostatic spinning film made of the phase change material containing polylactic acid by hot pressing forming, melt blowing process, or electrostatic spinning process.

28. The method of claim 23, wherein, The adhesive comprises at least one of sodium alginate, carboxymethyl cellulose, dextrin, and polyvinyl alcohol.

29. The method of claim 23, wherein, 30. A heating cigarette comprising the low-retention hollow paper tube as claimed in any one of claims 1-16 as a hollow cooling section. The low-retention hollow tube is applied to the heating cigarette as a hollow cooling section with a low-retention function.

31. Use of a low-retention hollow tube according to any one of claims 1 to 16 in a heated cigarette, wherein, The hollow cooling section is connected and compounded with a cellulose acetate filter rod section to form a filter rod.

32. The use of claim 31, wherein, ​

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