Low-retention and high-flavor-loading hollow tube for heated tobacco product and use

Abstract

The present disclosure relates to the technical field of production of heated tobacco products, and discloses a low-retention and high-flavor-loading hollow tube for a heated tobacco product and a use. The low-retention and high-flavor-loading hollow tube for a heated tobacco product has a multi-layer structure. The multi-layer structure comprises at least one flavoring layer, at least one low-retention layer, and at least one support layer. The support layer is located on the outer side of the low-retention layer. The flavoring layer is located on the inner side of the low-retention layer, or is located between the low-retention layer and the support layer. In the low-retention and high-flavor-loading hollow tube for a heated tobacco product of the present disclosure, by providing the low-retention layer and the flavoring layer, the retention of aerosol in the hollow tube is reduced, and the hollow tube has the characteristics of large flavoring amount, excellent flavoring stability, etc.; moreover, the hollow tube can reduce flavor volatilization and prolong flavor lasting time.

Description

Low-retention high-fragrance hollow tube for heating cigarettes and application

[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 Heating Cigarettes and a Preparation Method Thereof"; Chinese Patent Application No. 202411210045.1, filed on August 30, 2024, entitled "A Fragrance-Enhanced Thick-Wall Paper Tube Filter Stick and Application Thereof"; Chinese Patent Application No. 202510002455.5, filed on January 02, 2025, entitled "A Low-Retention Hollow Tube for Heating Cigarettes and Application Thereof"; Chinese Patent Application No. 202510002422.0, filed on January 02, 2025, entitled "A Low-Retention High-Fragrance Hollow Tube for Heating Cigarettes and Application Thereof"; and Chinese Patent Application No. 202510260213.6, filed on March 06, 2025, entitled "Heating Cigarettes, Low-Retention Hollow Paper Tube and Preparation Method Thereof", all of which are incorporated by reference in their entirety. TECHNICAL FIELD

[0002] The present disclosure relates to a hollow tube, in particular to a low-retention hollow tube for heating cigarettes, and to its application as a hollow cooling section in heating cigarettes, belonging to the field of heating tobacco. BACKGROUND

[0003] With people's concern for safety and health, the sales of heating cigarettes in the market are increasing. Compared with traditional cigarettes, heating cigarettes have the problems of low aroma release and insufficient smoke fullness. Usually, fruit aroma is sprayed on tobacco to increase the richness of smoke. However, during the heating smoking process, the added aroma has a low boiling point, and the problem of insufficient aroma in the last few puffs often occurs.

[0004] At present, the heating cigarette mainly adopts the combination of filter tip perfuming technology and tobacco perfuming technology to improve the taste and appeal of the cigarette to a certain extent, and to meet the needs of consumers for different tastes. Filter tip perfuming technology is the common way to add flavor, which mainly has the following three forms: 1. Perfume bead perfuming: by adding perfume beads in the filter tip, the natural loss of volatile flavor components can be delayed, and the artificial controllable release of characteristic flavor substances during the smoking process can be realized. This technology can significantly enhance the flavor of the cigarette, and the stability of each puff is good, so that the smoker can enjoy stable flavor in each puff. 2. Perfume line perfuming: this is a method of using cotton thread to add flavor in the filter tip. By heating the perfume liquid, the cotton thread adsorbs the perfume, and then releases the flavor during the cigarette filtering process. This method can accurately control the release amount of perfume, thereby providing continuous and stable flavor during smoking. 3. Perfume silk (paper rod) perfuming: by adding perfume in the silk (embossed paper) of the filter tip, the particle phase transfer rate and filter tip interception rate of the cigarette perfume are similar to those of other perfuming methods, which can provide certain flavor enhancement effect. However, the existing perfuming technology still has the following defects: 1. Perfume bead perfuming: high cost, complex process, and uncontrollable perfume bead additives. It has been restricted by many countries, and the solvent odor is large. 2. Perfume line perfuming: the loading capacity is too small (containing solvent is not more than 5 mg per stick), and the perfume holding capacity is weak, which cannot meet the high perfuming amount and long-lasting perfume holding requirements of ultra-low tar cigarettes and heating cigarettes. 3. Perfume silk (paper) perfuming: the process is not mature, the perfuming amount is basically uncontrollable, and large-scale industrial production cannot be realized. 4. For low-boiling-point and volatile perfume, the existing technology generally adopts multi-link saturated excess addition to ensure the persistence of the perfuming effect, which increases the product material cost and process difficulty, and the product quality is uncontrollable.

[0005] In addition, research shows that the aerosol released by the heated tobacco segment of the heating cigarette is intercepted by about 57% in the hollow segment, and by about 28% in the acetate filter segment, and only about 15% is released to be inhaled by the human body. There are two main reasons for the aerosol being intercepted in the hollow segment during the smoking process: 1) condensation deposition: aerosol condensation deposition on the inner wall of the hollow tube; 2) aerosol is physically intercepted and adsorbed by the inner wall of the hollow tube during continuous movement and collision. The proportion of the two reasons for the hollow segment interception of the main components in the aerosol is different, such as the water intercepted in the hollow segment is mainly deposited on the inner wall of the tube by thermal diffusion and condensation; such as the glycerol intercepted in the hollow segment is mainly physically intercepted on the inner wall of the tube by airflow impact; such as the nicotine intercepted in the hollow segment is about 1:1 in proportion to the two factors. SUMMARY

[0006] In view of the technical problems of low aroma release amount, uneven aroma release, and high aerosol interception of hollow sections in existing heated cigarette products, a first object of the present disclosure is to provide a low-interception high-aroma hollow tube for a heated cigarette, which can increase the aroma release amount and uniformity of aerosol characteristics of the heated cigarette, increase the heat conduction performance of the inner wall of the tube, reduce the condensation deposition of aerosol on the inner wall of the tube, increase the smoothness of the inner wall of the tube, reduce the physical interception and adsorption of aerosol, ensure a lower temperature on the outer side of the tube wall, and reduce the risk of "burning lips".

[0007] A second object of the present disclosure is to provide an application of a low-interception high-aroma hollow tube in a heated cigarette, which is applied as a functional filter rod segment with aroma enhancement, temperature reduction, and low interception in a heated cigarette, has the characteristics of large aroma loading amount and stable aroma loading, can reduce the interception amount of aerosol by the hollow tube, and can reduce the risk of "burning lips" through heat blocking.

[0008] To achieve the above technical objects, the present disclosure provides a low-interception high-aroma hollow tube for a heated cigarette, which has a multi-layer structure; the multi-layer structure comprises at least one aroma loading layer, at least one low-interception layer, and at least one support layer, and the support layer is located on the outer side of the low-interception layer; wherein the aroma loading layer is located on the inner side of the low-interception layer or between the low-interception layer and the support layer.

[0009] In some embodiments, the aroma loading layer is located on the inner side of the low-interception layer; the low-interception high-aroma hollow tube for a heated cigarette further comprises a heat blocking layer located between the low-interception layer and the support layer.

[0010] The key of the hollow tube of the present disclosure is that it is designed as a composite structure with multiple functions, the innermost layer is an aroma loading layer, which can impart characteristic aroma to the hollow tube, make up for the problems of insufficient aroma amount and uneven aroma release of the heated cigarette, and promote the release of aroma by utilizing the heat of smoke when it is designed in the innermost layer; the low-interception layer imparts a smooth inner wall, has weak adhesion to aerosol, and has strong heat conduction performance, which can reduce the condensation deposition of aerosol on the inner wall and achieve the purpose of reducing aerosol interception; the heat blocking layer can prevent heat transfer, ensure a higher temperature in the tube, avoid the condensation deposition of aerosol on the inner wall, make full use of the temperature of smoke to meet the aroma release, and avoid heat conduction to the outer wall to reduce the risk of "burning lips"; and the support layer can make the hollow tube form and maintain a certain hardness and elasticity.

[0011] In some embodiments, the flavoring layer is composed of flavor loaded on the surface of a polymer film material. As a preferred solution, the polymer film material is a polyethylene film or a polystyrene film. As a preferred solution, the thickness of the polymer film material is not more than 0.1 mm. As a preferred solution, the flavor is loaded on the outer surface of the polymer film material, and the coating amount is 0.2 mg / mm to 0.6 mg / mm. The flavoring layer uses a polyethylene film or a polystyrene film as a carrier to seal and fix the flavor on the inner wall of the hollow tube. In particular, the use of a polyethylene film or a polystyrene film with a relatively small thickness can achieve stable release of flavor at the temperature of smoke, thereby compensating for the defect of insufficient release of flavor of heated cigarettes. The design of the flavoring layer can achieve a high loading amount of flavor, for example, the flavoring amount of a hollow tube with a length of 112 mm can reach 20 mg to 60 mg. The thickness of the polymer film is not more than 0.1 mm. If the thickness is too thick, it will affect the release of flavor, but if the thickness is too thin, it will cause the flavor to volatilize too early. The thickness of the polymer film is further preferably 0.01 mm to 0.1 mm. The flavor is a conventional cigarette flavoring flavor in the prior art, such as peppermint essence, mango essence, watermelon essence, blueberry essence, menthol, menthone essence, etc.

[0012] In some embodiments, the low-retention layer is composed of paper doped with ceramic material or paper with a metal film on the surface. As a preferred solution, the ceramic material includes aluminum oxide or / and silicon carbide, and the doping amount of the ceramic material in the paper is 20wt% to 60wt%; the metal film includes an aluminum foil, and the mass ratio of the metal film to the paper is 1:1 to 1:2. As a preferred solution, when the low-retention layer is composed of paper doped with ceramic material, the inner surface thereof is subjected to calendering treatment; and when the low-retention layer is composed of paper with a metal film on the surface, the inner surface thereof 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 deposition of aerosol on the inner wall by using the heat of smoke. The mass ratio of the ceramic material in the paper is not less than 20%, and if the ratio is too low, the thermal conductivity coefficient will be low, thereby causing the aerosol to easily condense on the surface. The mass ratio of the ceramic material in the paper is preferably not more than 60%, and if the mass ratio is too high, it will affect the molding of the paper. The calendering treatment of the paper of the low-retention layer or the smooth metal film layer on the inner surface makes the inner surface smooth, which can reduce the retention of aerosol. The total grammage of the low-retention layer is not less than 40 g / cm 3 .

[0013] As a preferred scheme, the heat resistance layer is composed of inorganic thermal insulation material doped in paper or composed of paper with a coating of phase change material on the surface. As a preferred scheme, 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 heat resistance layer gives resistance to heat transfer, reduces the temperature of the side wall of the filter segment, reduces the risk of "burning lips", while being able to prevent the loss of heat in the hollow tube, thereby reducing the condensation deposition of aerosol on the inner wall of the tube. The 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 .

[0014] As a preferred scheme, the support layer is composed of paper doped with basalt fiber. As a preferred scheme, the doping amount of the basalt fiber is 20wt%-40wt%. The introduction of the basalt fiber can give the hollow tube a certain shape, maintain a relatively high hardness and have a certain elasticity, while the basalt fiber has low thermal conductivity, which can 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 .

[0015] As a preferred scheme, the low-cut high-fragrance hollow tube for heated cigarettes has a four-layer structure, which is, from inside to outside, a fragrance layer, a low-cut layer, a heat resistance layer and a support layer. The four-layer structure design of the hollow tube of the present disclosure is an ideal design, and the four layers are, from inside to outside, a fragrance layer, a low-cut layer, a heat resistance layer and a support layer, so that the functions of each layer can be fully exerted. The fragrance layer is designed in the innermost layer and is adjacent to the low-cut layer with thermal conductivity, which can ensure that enough heat is maintained to stabilize the volatilization of fragrance, while the inner side of the low-cut layer is smooth and has high thermal conductivity, which can reduce the cutting effect on aerosol. The heat resistance layer is adjacent to the low-cut layer, which can avoid the conduction of heat to the outside, ensure that the temperature of the inner wall of the hollow tube is high, which is conducive to the release of fragrance and reduces the cutting of aerosol on the inner wall, while ensuring that the temperature of the outer wall is relatively low, reducing the risk of "burning lips"; in particular, the support layer introduces inorganic fibers to improve the hardness and elasticity of the hollow tube, which plays a mechanical support role, and further plays a heat insulation role.

[0016] The present disclosure also provides a low-cut high-fragrance hollow tube for use in heated cigarettes, which is used as a hollow cooling segment with the functions of fragrance enhancement and low cutting in heated cigarettes. It is used as a filter rod segment with the functions of fragrance enhancement, cooling and low cutting in heated cigarettes, which has the characteristics of large amount of fragrance and stable fragrance, while it can reduce the cutting amount of aerosol on the hollow tube, and it can also reduce the risk of "burning lips" through heat resistance.

[0017] As a preferred scheme, the hollow cooling section is butted and combined with the acetate filter rod section to form a filter rod.

[0018] Compared with the prior art, the technical scheme of the present disclosure has the following beneficial technical effects: the hollow tube in the prior art mainly plays a role in temperature reduction, so it has a relatively large aerosol interception amount and does not have a perfuming function. The design of the low-interception high-perfume hollow tube of the present disclosure has the following advantages: 1) it can increase the aerosol aroma release amount of a heated cigarette and the uniformity of the release; 2) it can reduce 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; and 3) it can ensure normal temperature reduction function. In summary, the hollow tube of the present disclosure can not only reduce the aerosol interception amount of the hollow tube and solve the problems of insufficient aroma amount and uneven aroma release of a heated cigarette, but also reduce the risk of "burning lips" through heat blocking.

[0019] In some embodiments, the perfuming layer is located between the low-interception layer and the support layer.

[0020] The low-interception high-perfume hollow tube for a heated cigarette of the present disclosure has a multi-layer structure, in which the support layer mainly provides the mechanical strength of the hollow tube, the perfuming layer mainly provides the aroma substances, and the low-interception layer plays a role in insulation and is arranged in the innermost layer of the hollow tube to minimize the adsorption of smoke by the hollow tube, reduce the volatilization of aroma, increase the aroma retention time, and well solve the problems of small amount of smoke due to large adsorption of smoke by the hollow tube and short-lasting and poor stability of aroma due to large volatility of most aroma substances.

[0021] In some embodiments, the support layer is composed of non-woven paper, grooved paper, cellulose paper or metal sheet. The metal sheet is, for example, aluminized paper, aluminum foil paper and the like. The support layer has a certain mechanical strength and provides sufficient mechanical support for the hollow tube.

[0022] In some embodiments, the perfuming layer comprises a carrier material and aroma substances. As a more preferred scheme, the carrier material comprises at least one of natural fibers, synthetic fibers, porous particles and adsorption resins. The natural fibers are, for example, broadleaf wood pulp fibers, coniferous wood pulp fibers, hemp pulp fibers and the like, the synthetic fibers include polyethylene melt-blown fibers, polypropylene melt-blown fibers and the like, the porous particles are, for example, activated carbon, aluminum oxide, minerals (specifically, diatomite, bentonite and the like); and the adsorption resins are, for example, commercialized SAP, polystyrene resins, polyacrylate resins and the like. The most preferred carrier material is polyethylene melt-blown fibers or polypropylene melt-blown fibers, which have the largest load amount of aroma substances in the same amount of carrier material and have good adsorption stability of aroma substances, so as to greatly increase the load amount of aroma substances in the paper tube filter rod and make the aroma substances volatilize stably.

[0023] In some embodiments, the flavoring substances include low-boiling-point flavoring substances; the low-boiling-point flavoring substances include at least one of menthol, menthone, and low-carbon esters. These low-boiling-point flavoring substances are conventional flavoring substances in cigarettes, but their low boiling points and strong volatility can cause unstable volatilization during use and short duration. The present disclosure solves this technical problem by using a carrier material with strong adsorption capacity for flavoring substances and good loading stability, and by providing a low-retention layer to reduce excessive rapid volatilization caused by high-temperature smoke.

[0024] In some embodiments, the loading amount of low-boiling-point flavoring substances in the flavoring layer is 10 g / m 2 ~ 50 g / m 2 . By selecting a preferred carrier material, the loading amount of low-boiling-point flavoring substances in the flavoring layer can be increased to meet the flavoring requirements of low-tar cigarettes or heat-not-burn cigarettes. The loading amount of low-boiling-point flavoring substances in the flavoring layer is further preferably 30 g / m 2 ~ 50 g / m 2 .

[0025] In some embodiments, the low-retention layer includes a paper or aluminum-coated paper coated with silica gel.

[0026] In some embodiments, a slit is formed on the low-retention layer; for example, the low-retention layer extends in a spiral shape and has a slit in the spiral extension direction. The area of the slit accounts for less than or equal to 50% of the inner surface area of the aluminum-coated paper. The formation of the slit on the low-retention layer allows the flavoring substances in the flavoring layer to be released slowly through the slit into the aerosol, thereby increasing the duration of the flavor.

[0027] In some embodiments, the tube wall thickness is 1-5 mm. By increasing the thickness of the tube wall, more layers of flavoring layers can be provided to increase the flavor loading capacity of the hollow tube. The low-retention high-flavor-loading hollow tube for heat-not-burn cigarettes provided by the present disclosure has an inner diameter of 1-3 mm, an outer diameter of the paper tube of 5-8 mm, and a tube wall thickness of 1-5 mm. The tube wall thickness is further preferably 2-3 mm.

[0028] The low-retention high-flavor-loading hollow tube for heat-not-burn cigarettes provided by the present disclosure has a three-layer to five-layer structure. When it has a three-layer structure, the innermost layer is a low-retention layer, the outermost layer is a support layer, and the middle layer is a flavoring layer. When it has a three-layer or more structure, the innermost layer is a low-retention layer, and the remaining layers are any combination of support layers, flavoring layers, and low-retention layers, and at least one support layer, at least one flavoring layer, and at least one low-retention layer are included in the low-retention high-flavor-loading hollow tube for heat-not-burn cigarettes.

[0029] In some embodiments, the outermost layer of the low-retention high-flavor hollow tube for heated cigarettes is a metal foil. When the outermost layer is a metal foil, it can be in close contact with the inner wall of the smoking device, thereby increasing heat conduction and significantly improving the amount of smoke in the first puff.

[0030] The present disclosure also provides a low-retention high-flavor hollow tube for heated cigarettes, which is used in low-tar cigarettes or heat-not-burn cigarettes.

[0031] As a preferred solution, the low-retention high-flavor hollow tube for heated cigarettes is combined with a cellulose acetate filter rod to form a filter.

[0032] The preparation method of the low-retention high-flavor hollow tube for heated cigarettes according to the present disclosure includes the following steps: combining support layer material, flavoring layer material, and low-retention layer material according to the designed number of layers, and then using spiral, flat, inclined, or staggered bonding rolling processes to roll the paper tube.

[0033] The low-retention high-flavor hollow tube for heated cigarettes provided by the present disclosure has the characteristics of high flavor loading, long-lasting flavor, and stable release, and can reduce the adsorption of paper tube to smoke, meet the application requirements of low-tar cigarettes or heat-not-burn cigarettes, and solve the problem that existing flavor lines and tow flavoring cannot meet the large demand for flavor compensation of low-tar cigarettes and heated cigarettes. BRIEF DESCRIPTION OF DRAWINGS

[0034] 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.

[0035] FIG. 1 is a cross-sectional view of a low-retention high-flavor hollow tube for heated cigarettes according to an embodiment of the present disclosure; and

[0036] FIG. 2 is a cross-sectional view of a low-retention high-flavor hollow tube for heated cigarettes according to an embodiment of the present disclosure;

[0037] Legend of the drawings: 1 - low-retention layer; 2 - flavoring layer; 3 - support layer; 4 - heat-blocking layer. DETAILED DESCRIPTION

[0038] The following specific embodiments are intended to further illustrate the present disclosure, but not limit the protection scope of the claims of the present disclosure.

[0039] The prepared hollow tube is detected in the following aspects:

[0040] 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”;

[0041] 2. The prepared hollow tube is compounded with acetate filter segment and then rolled with tobacco segment to form a heat-not-burn cigarette (cigarette information: total length of cigarette 71 mm, length of acetate filter segment 13 mm, length of hollow tube 28 mm, length of tobacco segment 30 mm, circumference 21 mm, filter ventilation 50%), and after smoking by a smoking machine, the main components including nicotine, moisture and glycerol trapped by the hollow tube are determined by gas chromatography, and the aroma release of each puff of heat-not-burn cigarette aerosol is determined by headspace gas chromatography. Determination method: according to the recommended method of CORESTA No. 84.

[0042] Example 1

[0043] 1) Aroma layer: mango flavor solution (ethanol / water as solvent) is uniformly coated on the low retention layer by coating, the aroma amount of 112 mm length is 40 mg, the coating speed is 30 m / min, and then drying is performed, the drying temperature is 45°C, and the drying time is 15 min. After drying, polyethylene film is extruded to cover the surface of the aroma, the pressure is 0.2 MPa, and the film thickness is 0.1 mm.

[0044] 2) Low retention layer: plant fibers (softwood pulp, hardwood pulp, mass ratio 5:5) are mixed and pulped (beating degree 50°SR), and then wet strength agent polyamide epichlorohydrin resin (2% of fiber mass) and retention aid cationic polyacrylamide (1% of fiber mass) are added to obtain composite pulp; after long net forming 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 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 cylinder temperature is 100°C, and the drying time is 30 min), and after cutting, a hollow paper tube base paper is obtained. Aluminum foil is transferred to the surface of the base paper by transfer, the base paper has a grammage of 37 g / cm 3 , and the total grammage after compounding is 74 g / cm 3 .

[0045] 3) Heat-resistant layer: plant fibers (softwood pulp, hardwood pulp, mass ratio 5:5) and glass fibers (accounting for 30% of plant fibers) are mixed and pulped (beating degree 50°SR), and then wet strength agent polyamide epichlorohydrin resin (2% of fiber mass) and retention aid cationic polyacrylamide (1% of fiber mass) are added to obtain composite pulp; after long net forming 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 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 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 .

[0046] 4) Support layer: the plant fiber (coniferous pulp, broadleaf pulp, mass ratio 5:5) and basalt fiber (30% of the plant fiber) were mixed and beaten (beating degree 50°SR), then wet strength agent polyamide epichlorohydrin resin (2% of the fiber mass) and retention aid cationic polyacrylamide (1% of the fiber mass) were added to obtain a composite pulp; long net was used to form and dry the paper (two groups of drying cylinders were used for drying, wherein the pressure of the inner support roll of the drying cylinder of the first group of drying cylinders was 100 kg / cm, the drying cylinder temperature was 130°C, and the drying time was 20 min; the pressure of the inner support roll of the drying cylinder of the second group of drying cylinders was 60 kg / cm, the drying cylinder temperature was 100°C, and the drying time was 30 min), and after cutting, a hollow paper tube support layer base paper was obtained, with a grammage of 50 g / cm 3 .

[0047] 5) Composite: the low retention layer, the heat resistance layer and the support layer with the added fragrance layer were spirally formed and rolled into a hollow tube.

[0048] Example 2

[0049] 1) Fragrance layer: a watermelon fragrance solution (ethanol / water as solvent) was uniformly coated on the low retention layer by coating, the fragrance amount of 112 mm length was 50 mg, the coating speed was 50 m / min, and then drying was performed at a drying temperature of 50°C for 15 min. After drying, a polyethylene film was extruded to cover the surface of the fragrance, with a pressure of 0.2 MPa and a film thickness of 0.1 mm.

[0050] 2) Low retention layer: the plant fiber (coniferous pulp, broadleaf pulp, mass ratio 5:5) was mixed and beaten (beating degree 50°SR), 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) were added to obtain a composite pulp; long net was used to form and dry the paper (two groups of drying cylinders were used for drying, wherein the pressure of the inner support roll of the drying cylinder of the first group of drying cylinders was 100 kg / cm, the drying cylinder temperature was 130°C, and the drying time was 20 min; the pressure of the inner support roll of the drying cylinder of the second group of drying cylinders was 60 kg / cm, the drying cylinder temperature was 100°C, and the drying time was 30 min), and after cutting, a hollow paper tube base paper was obtained. The base paper was subjected to calendering treatment to ensure the smoothness of the surface, and the total grammage was 64 g / cm 3 .

[0051] 3) Thermal resistance layer: the plant fiber (conifer pulp, broadleaf pulp, mass ratio 5:5) and rock wool (accounting for 25% of the plant fiber) are mixed and beaten (beating degree 50°SR), then the wet strength agent polyamide epoxy chloropropane resin (2% of the fiber mass) and the retention aid cationic polyacrylamide (1% of the fiber mass) are added to obtain a composite pulp; after long net papermaking and molding, drying (two groups of drying cylinders are used for drying, wherein the pressure of the drying cylinder 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 drying cylinder 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, the hollow paper tube thermal resistance layer raw paper with a grammage of 50 g / cm is obtained 3 .

[0052] 4) Support layer: the plant fiber (conifer pulp, broadleaf pulp, mass ratio 5:5) and basalt fiber (accounting for 30% of the plant fiber) are mixed and beaten (beating degree 50°SR), then the wet strength agent polyamide epoxy chloropropane resin (2% of the fiber mass) and the retention aid cationic polyacrylamide (1% of the fiber mass) are added to obtain a composite pulp; after long net papermaking and molding, drying (two groups of drying cylinders are used for drying, wherein the pressure of the drying cylinder 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 drying cylinder 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, the hollow paper tube support layer raw paper with a grammage of 50 g / cm is obtained 3 .

[0053] 5) Composite: the low retention layer, the thermal resistance layer and the support layer with the fragrance layer are spirally formed and rolled into a hollow tube.

[0054] Comparative Example 1

[0055] The plant fiber (conifer pulp, broadleaf pulp, mass ratio 5:5) is mixed and beaten (beating degree 50°SR), then the wet strength agent polyamide epoxy chloropropane resin (2% of the fiber mass) and the retention aid cationic polyacrylamide (1% of the fiber mass) are added to obtain a composite pulp; after long net papermaking and molding, drying (two groups of drying cylinders are used for drying, wherein the pressure of the drying cylinder 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 drying cylinder 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, the hollow paper tube raw paper with a grammage of 64 g / cm is obtained 3 , which is spirally formed and rolled into a hollow paper tube.

[0056] Table 1 Comparison of retention data of examples and comparative examples

[0057] Table 2 Example 1 aroma component release data per puff

[0058] Table 3 Example 2 aroma component release data per puff

[0059] Table 4 Comparative Example 1 aroma component release data per puff

[0060] Example 3

[0061] 1. Three-layer paper tube. Take the paper tube rod with a wall thickness of 2 mm for example to prepare a filter rod with a circumference of 20.8 mm, the paper width is between 6-8 mm; the composite structure of the thick-wall paper tube filter rod is as follows in Table 5.

[0062] Table 5 Thick-wall paper tube structure design

[0063] 2. The menthol, menthone essence and solvent ethanol are configured into a homogeneous phase coating liquid in a ratio of 2:2:1, and are uniformly coated on the middle aroma-carrying layer (1#, 2#, 3#) and the 4# inner layer non-woven paper, the coating amount (measured by the essence loading amount) is 1# 30 g / m 2 , 2# 18 g / m 2 , 3# 22 g / m 2 , 4# 6 g / m 2 . At the same time, all the substrates are cut into 7.5 mm wide paper strips for use. The three-layer or two-layer substrates are bonded into a composite material, and are rolled into a thick-wall paper tube with a circumference of 20.8 mm by means of a diagonal pull. Then the composite filter rod is dried and cut into the required specifications of the paper substrate rod.

[0064] 3. The menthol is compounded with acetate fiber into a filter for cigarettes, and the menthol content in the filter is detected, and the results are as follows:

[0065] Table 6 Filter menthol content detection results

[0066] The detection results show that the menthol content of the paper tube (three layers) containing a thick-wall aroma-carrying layer and a permeation-preventing layer is higher than that of the ordinary menthol paper tube rod (two layers), and the menthol retention time is longer.

[0067] 4. The above filter is rolled into a cigarette, and the total particulate matter content of the smoke is detected, and the results are as follows:

[0068] Table 7 Smoke total particulate matter detection results

[0069] The total particulate matter of the sample with a permeation-preventing layer increases by 29.4%.

[0070] Example 4

[0071] 1, Three-layer paper tube. Take paper tube with wall thickness of 2 mm as an example for preparing filter rod with a circumference of 20.8 mm, the width of paper is between 6-8 mm; the composite structure of thick-wall paper tube filter rod is as follows:

[0072] Table 8

[0073] 2, The blueberry flavor and glycerol and ethanol are configured into a homogeneous phase coating liquid, which is uniformly coated on the blank acrylic melt-blown fiber mesh cloth, and the coating amount is 30 g / m 2 At the same time, all the substrates are cut into 7.5 mm wide paper strips for standby. The three-layer substrate is bonded into a composite material, which is rolled into a thick-wall paper tube with a circumference of 20.8 mm by means of inclined pull. Then, through drying, cutting into paper base rod of required specification of composite filter rod, and compounding with acetate fiber into binary composite filter rod, and rolling into a cigarette, and compared with ordinary paper tube flavored cigarette, the blueberry characteristic aroma of the cigarette containing the diatomite fiber layer is full and lasting, and the uniformity of each puff is better than that of the control.

[0074] Example 5

[0075] 1, Four-layer paper tube. Take paper tube with wall thickness of 2 mm as an example for preparing filter rod with a circumference of 20.8 mm, the width of paper is between 6-8 mm; the composite structure of thick-wall paper tube filter rod is as follows:

[0076] Table 9 Thick-wall paper tube structure design

[0077] 2, The above paper tube is compounded with acetate fiber into a filter, and rolled into a cigarette, and the particulate matter content of each puff of smoke is detected, and the results are as follows:

[0078] Table 10 Results of particulate matter detection of each puff of smoke

[0079] The test results show that for the surrounding heating cigarette, the outermost layer is aluminum foil, which is in close contact with the inner wall of the smoking tool, can increase the heat conduction, and significantly improve the first puff smoke volume.

[0080] The specific implementation of the above-described disclosure does not constitute a limitation on the protection scope of the disclosure. Any various other corresponding changes and modifications made according to the technical concept of the disclosure shall be included in the protection scope of the claims of the disclosure.

Claims

1. A low-cut high-charge hollow tube for a heated cigarette, wherein, has a multi-layer structure; the multi-layer structure comprises at least one perfuming layer, at least one low-retention layer and at least one support layer, the support layer is located outside the low-retention layer; wherein the perfuming layer is located inside the low-retention layer, or between the low-retention layer and the support layer.

2. The low-cut high-charge hollow tube for a heated cigarette according to claim 1, wherein the perfuming layer is located inside the low-retention layer; the low-retention high-flavor-loading hollow tube for the heated cigarette further comprises a heat-blocking layer, the heat-blocking layer is located between the low-retention layer and the support layer.

3. The low-cut high-charge hollow tube for a heated cigarette according to claim 2, wherein the perfuming layer is composed of a flavor loaded on the surface of a polymer film material.

4. The low-retention high-flavor-loading hollow tube for the heated cigarette according to claim 3, wherein, the polymer film material is a polyethylene film or a polystyrene film; the thickness of the polymer film material is not more than 0.1 mm.

5. The low-cut high-charge hollow tube for a heated cigarette according to claim 3, wherein the flavor is loaded on the outside surface of the polymer film material, and the loading amount is 0.2 mg / mm to 0.6 mg / mm.

6. The low-cut high-charge hollow tube for a heated cigarette according to claim 3, wherein the low-retention layer is composed of paper doped with ceramic material or paper with a metal film on the surface.

7. The low-retention high-flavor-loading hollow tube for the heated cigarette according to claim 6, wherein, the ceramic material comprises alumina or / and silicon carbide, and the doping amount of the ceramic material in the paper is 20 wt% to 60 wt%; the metal film comprises aluminum foil, and the mass ratio of the metal film to the paper is 1:1 to 1:

2.

8. The low-retention high-flavor-loading hollow tube for the heated cigarette according to claim 6, wherein, when the low-retention layer is composed of paper doped with ceramic material, the inside surface thereof is subjected to calendering treatment; when the low-retention layer is composed of paper with a metal plating film on the surface, the inside surface thereof is a metal film.

9. The low-cut high-charge hollow tube for a heated cigarette according to claim 2, wherein the heat-blocking layer is composed of inorganic heat-insulating material doped in paper or paper with a phase change material coating on the surface.

10. The low-cut high-charge hollow tube for a heated cigarette according to claim 9, wherein the inorganic heat-insulating material comprises glass fiber or / and rock wool, and the doping amount of the inorganic heat-insulating material in the paper is 20 wt% to 40 wt%.

11. The low-cut high-charge hollow tube for a heated cigarette according to claim 2, wherein the support layer is composed of paper doped with basalt fiber.

12. The low-cut high-charge hollow tube for a heated cigarette according to claim 9, wherein the doping amount of the basalt fiber is 20 wt% to 40 wt%.

13. The low-cut high-charge hollow tube for a heated cigarette according to any one of claims 2 to 12, wherein has a four-layer structure, and from inside to outside, the layers are a perfuming layer, a low-retention layer, a heat-blocking layer and a support layer.

14. The low-cut high-charge hollow tube for a heating cigarette according to claim 1, wherein the perfuming layer is located between the low-retention layer and the support layer.

15. The low-cut high-charge hollow tube for a heated cigarette according to claim 14, wherein the support layer is composed of non-woven paper, grooved paper, cellulose paper or metal sheet.

16. The low-cut high-charge hollow tube for a heated cigarette according to claim 14, wherein the perfuming layer comprises a carrier material and a flavoring substance.

17. The low-retention high-flavor-loading hollow tube for the heated cigarette according to claim 16, wherein, the carrier material comprises at least one of natural fiber, synthetic fiber, porous particle and adsorption resin; the flavoring substance comprises low-boiling-point flavoring substance, and the low-boiling-point flavoring substance comprises at least one of menthol, menthone and low-carbon ester.

18. The low-retention high-flavor-loading hollow tube for the heated cigarette according to claim 16 or 17, wherein, The loading of the fragrance substance in the perfuming layer is 10 g / m 2 ~ 50 g / m 2 .

19. The low-retention high-flavor-loading hollow tube for the heated cigarette according to claim 14, wherein, the low-retention layer comprises paper coated with silica gel layer or aluminum-plated paper.

20. The low-cut high-charge hollow tube for a heated cigarette according to claim 19, wherein the low-retention layer is provided with a slit; the area of the slit accounts for less than or equal to 50% of the inner surface area of the low-retention layer.

21. The low-cut high-charge hollow tube for a heated cigarette according to any one of claims 14 to 17, 19, wherein, The pipe wall thickness of the low-retention high-fragrance hollow pipe for the heated cigarette is 1-5 mm.

22. The low-cut high-charge hollow tube for a heated cigarette according to any one of claims 14 to 17, 19, wherein, The outermost layer of the low-retention high-fragrance hollow pipe for the heated cigarette is a metal sheet.

23. Use of the low-rejection high-perfume loading hollow tube according to any one of claims 1 to 13 in a heated tobacco product, wherein, The hollow cooling section with the functions of fragrance enhancement and low retention is applied to the heated cigarette.

24. Use of the low retention high perfume loading hollow tube according to claim 23 in a heated cigarette, wherein, The hollow cooling section is butted with the acetate filter stick section to form a filter stick.

25. Use of a low-retention, high-fragrance hollow tube according to any one of claims 14 to 22, wherein, For low-tar cigarettes or heated non-combustion cigarettes.

26. Use of a low retention high perfume loading hollow tube according to claim 25, wherein, The low-retention high-fragrance hollow pipe is combined with the acetate filter stick to form a filter.

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