Low-interception hollow tube for heating cigarettes and application of low-interception hollow tube

Abstract

The invention discloses a low-interception hollow pipe for heating cigarettes and application of the low-interception hollow pipe, and belongs to the technical field of heating cigarette production. The low-interception hollow tube for heating the cigarettes is of a multi-layer structure and comprises at least one low-interception layer, at least one heat resisting layer and at least one supporting layer, the innermost layer is the low-interception layer, the low-interception layer serves as a hollow cooling section to be used for heating the cigarettes, condensation deposition and interception of aerosol in the hollow tube can be reduced, and the cigarette quality is improved. Meanwhile, it can be guaranteed that the temperature of the outer wall of the hollow pipe is low, and the risk of lip scalding is reduced.

Description

Technical Field

[0001] The invention relates to a hollow tube, in particular to a low-entrapment hollow tube for heated cigarettes, and also to the application of the hollow tube as a hollow cooling section in heated cigarettes, belonging to the field of heated tobacco. Background Art

[0002] As people pay more attention to safety and health, the sales of heated cigarettes in foreign markets are growing. At present, heated cigarettes have the problem of low aerosol smoke volume. According to research, the aerosol released by the heated tobacco segment of heated cigarettes is intercepted in the hollow segment by about 57%, and the acetate filter segment is intercepted by about 28%, and only about 15% is released and inhaled by the human body. There are two main reasons for the interception of aerosols through the hollow segment during the inhalation process: 1) condensation deposition: the aerosol cools down and condenses and deposits on the inner wall of the hollow tube; 2) the aerosol is physically intercepted and adsorbed by the inner wall of the hollow tube during the continuous movement and collision. There are differences in the proportion of the main components of the aerosol intercepted in the hollow segment due to the two reasons. For example, the water intercepted in the hollow segment is mainly deposited on the inner wall of the tube due to heat diffusion and condensation; for example, the glycerol intercepted in the hollow segment is mainly physically intercepted on the inner wall of the tube due to the impact of airflow; for example, the nicotine intercepted in the hollow segment is about 1:1 due to the two factors. Summary of the invention

[0003] In view of the technical problem of high interception of the hollow cooling section in existing heated cigarette products, the first object of the present invention is to provide a low-interception hollow tube, which can ensure that the temperature of the side wall of the filter section is reduced on the basis of effectively reducing the aerosol interception amount of the hollow tube, thereby reducing the risk of "burning lips".

[0004] The second object of the present invention is to provide an application of a low-interception hollow tube in heated cigarettes, which is used as a filter rod segment with cooling and low-interception functions in heated cigarettes. While reducing the interception amount of the hollow tube, it can also reduce the risk of "burning lips" by heat-blocking.

[0005] In order to achieve the above technical objectives, the present invention provides a low retention hollow tube for heated cigarettes, which has a multi-layer structure; the multi-layer structure includes at least one low retention layer, at least one heat-resistant layer and at least one support layer, and the innermost layer is the low retention layer.

[0006] The key to the hollow tube of the present invention is to design it into a composite structure with multiple functions. The innermost layer is a low retention layer with a smooth inner wall. It has a weak adhesion ability to aerosols and a strong thermal conductivity, which can reduce the condensation and deposition of aerosols on the inner wall, thereby achieving the purpose of reducing aerosol retention; the heat-resistant layer can prevent heat transfer, reduce the temperature of the side wall of the filter section, and reduce the risk of "burned lips". At the same time, the heat-resistant layer can prevent heat from being transmitted outward, and can ensure that the temperature inside the hollow tube is high, which can further reduce the condensation and deposition of aerosols on the inner wall; and the support layer can shape the hollow tube and maintain a certain hardness and elasticity.

[0007] As a preferred solution, the low retention layer is composed of paper doped with ceramic material or paper with a metal film on the surface. As a more preferred solution, the ceramic material includes aluminum oxide and / or silicon carbide, and the doping amount of the ceramic material in the paper is 20-60wt%. As a more preferred solution, the metal film includes 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 composed of paper doped with ceramic material, its inner surface is calendered; when the low retention layer is composed of paper with a metal coating on the surface, its inner surface is a metal film. The inner wall of the low retention layer is smooth and not easy to adhere to aerosols. At the same time, it has strong thermal conductivity and can use the heat of the flue gas to reduce the condensation and deposition of aerosols on the inner wall. The mass proportion of the ceramic material in the paper is not less than 20%. If its proportion is too low, it will lead to a low thermal conductivity, which will cause the aerogel to condense on its surface. The mass proportion of the ceramic material in the paper is preferably not more than 60%. If its mass proportion is too high, it will affect the forming of the paper. The paper of the low retention layer is calendered or the inner surface is a smooth metal film layer to make the inner surface smooth, which can reduce the retention of aerosols. The total gram weight of the low retention layer is not less than 40 g / cm 3 .

[0008] As a preferred solution, the heat-resistant layer is composed of inorganic heat-insulating materials mixed in paper or paper with a phase change material coating on the surface. As a more preferred solution, the inorganic heat-insulating material includes glass fiber and / or rock wool; the amount of the inorganic heat-insulating material mixed in the paper is 20~40wt%. The coating thickness of the phase change material on the surface of the paper is 0.1mm~0.3mm. The heat-resistant layer gives it the function of preventing heat transfer, thereby reducing the temperature of the side wall of the filter segment and reducing the risk of "burned lips". At the same time, it can prevent the loss of heat in the hollow tube, maintain the high temperature in the tube, and then reduce the condensation and deposition of aerosols on the inner wall of the tube. The glass fiber and / or rock wool have a good heat-insulating effect, and the phase change material can quickly absorb heat through phase change, such as polylactic acid. The total gram weight of the paper of the heat-resistant layer is not less than 40 g / cm 3 .

[0009] As a preferred solution, the support layer is composed of paper doped with basalt fibers. As a more preferred solution, the doping amount of the basalt fibers is 20-40wt%. The introduction of the basalt fibers can give the hollow tube a shape, maintain a high hardness and have a certain elasticity. At the same time, the basalt fibers have 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 gram weight of the paper of the support layer is not less than 40 g / cm 3 .

[0010] As a more preferred solution, the low-retention hollow tube for heating cigarettes has a three-layer structure, which includes a low-retention layer, a heat-resistant layer and a support layer from the inside to the outside.

[0011] The three-layer structure of the hollow tube of the present invention is an ideal design, and from the inside to the outside, it is a low retention layer, a heat-resistant 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 sufficient heat to reduce the interception effect on aerosols. At the same time, the inner side of the low retention layer is smooth, which can reduce the interception effect on aerosols. The heat-resistant layer has a heat-insulating effect. It is designed in the middle layer to prevent heat from being conducted to the outside, ensuring that the smoke temperature of the inner wall of the hollow tube is high, while the temperature of the outer wall is low, thereby reducing the risk of "burned lips". In the outermost support layer, inorganic fibers are introduced to improve the hardness and elasticity of the hollow tube, which plays a mechanical support role. At the same time, its inorganic fibers also further play a heat-insulating role.

[0012] The present invention also provides an application of a low-interception hollow tube in a heated cigarette, which is applied to a heated cigarette as a hollow cooling section with a low-interception function. The low-interception hollow tube replaces a conventional hollow tube for heating cigarettes, which can ensure that the side wall temperature of the filter section is reduced on the basis of effectively reducing the aerosol interception amount of the hollow tube, thereby reducing the risk of "burning lips".

[0013] As a preferred solution, the hollow cooling section is butt-jointed with the acetate filter rod section to form a filter rod.

[0014] Compared with the prior art, the technical solution of the present invention has the following beneficial technical effects: The hollow tube in the prior art mainly plays a cooling role, so its interception amount of aerosol is relatively large. The design of the low interception hollow tube of the present invention has the following advantages: 1) It can reduce the condensation and deposition of aerosol on the inner wall of the tube and the physical interception and adsorption effect of the hollow tube on the wall; 2) It can ensure the normal cooling function and reduce the risk of "burned lips". In summary, the hollow tube of the present invention can not only reduce the interception amount of aerosol by the hollow tube, but also reduce the risk of "burned lips" by heat insulation. DETAILED DESCRIPTION

[0015] The following specific embodiments are intended to further illustrate the content of the present invention in detail, rather than to limit the protection scope of the claims of the present invention.

[0016] The prepared hollow tubes were tested in the following aspects: 1. Test the hardness of the hollow paper tube according to the method of GB / T22838 "Determination of physical properties of cigarettes and filter rods"; 2. The prepared hollow tube is compounded with the acetate filter segment and then rolled with the tobacco segment to form a heated cigarette (cigarette information: total length of the cigarette is 71mm, length of the acetate filter segment is 13mm, length of the hollow tube is 28mm, length of the tobacco segment is 30mm, circumference is 21mm, and ventilation of the filter is 50%). The main components retained by the hollow tube, including nicotine, moisture, and glycerin, are determined by gas chromatography after smoking using a smoking machine. Determination method: in accordance with CORESTA recommended method No. 84.

[0017] Example 1 1) Low retention layer: After plant fibers (coniferous wood pulp and hardwood wood pulp, mass ratio of 5:5) are mixed and beaten (beating degree 50°SR), wet strength agent polyamide epichlorohydrin resin (2% of fiber mass) and retention agent cationic polyacrylamide (1% of fiber mass) are added to obtain composite pulp; after long-net papermaking and forming, it is dried (two groups of drying cylinders are used for drying, among which the pressure of the rollers in the first group of drying cylinders is 100kg / cm, the drying cylinder temperature is 130℃, and the drying time is 20min; the pressure of the rollers in the second group of drying cylinders is 60kg / cm, the drying cylinder temperature is 100℃, and the drying time is 30min) and cut to obtain hollow paper tube base paper. Aluminum foil is transferred to the surface of the base paper by transfer, and the base paper weight is 37 g / cm 3 , total weight after compounding: 74 g / cm 3 .

[0018] 2) Heat-resistant layer: After the plant fiber (coniferous wood pulp and hardwood wood pulp, the mass ratio is 5:5) and the glass fiber (accounting for 30% of the plant fiber) are mixed and beaten (beating degree 50°SR), the wet strength agent polyamide epichlorohydrin resin (2% of the fiber mass) and the retention agent cationic polyacrylamide (1% of the fiber mass) are added to obtain the composite pulp; after the long-net paper is formed and dried (two groups of drying cylinders are used for drying, among which the pressure of the roller in the drying cylinder of the first group of drying cylinders is 100kg / cm, the drying cylinder temperature is 130℃, and the drying time is 20min; the pressure of the roller in the drying cylinder of the second group of drying cylinders is 60kg / cm, the drying cylinder temperature is 100℃, and the drying time is 30min) and cut, the hollow paper tube heat-resistant layer base paper is obtained, with a gram weight of 50 g / cm 3 .

[0019] 3) Support layer: After the plant fiber (coniferous wood pulp and hardwood wood pulp, the mass ratio is 5:5) and basalt fiber (accounting for 30% of the plant fiber) are mixed and beaten (beating degree 50°SR), wet strength agent polyamide epichlorohydrin resin (2% of the fiber mass) and retention agent cationic polyacrylamide (1% of the fiber mass) are added to obtain a composite pulp; after forming by long-net copying, drying (two groups of drying cylinders are used for drying, among which the pressure of the roller in the drying cylinder of the first group of drying cylinders is 100kg / cm, the drying cylinder temperature is 130℃, and the drying time is 20min; the pressure of the roller in the drying cylinder of the second group of drying cylinders is 60kg / cm, the drying cylinder temperature is 100℃, and the drying time is 30min) and cutting, the base paper of the hollow paper tube support layer is obtained, with a gram weight of 50 g / cm 3 .

[0020] 3) Composite: The low retention layer, the heat-resistant layer and the support layer are spirally formed and rolled into a hollow tube.

[0021] Example 2 1) Low retention layer: After plant fibers (coniferous wood pulp and hardwood wood pulp, mass ratio of 5:5) are mixed and beaten (beating degree 50°SR), wet strength agent polyamide epichlorohydrin resin (2% of fiber mass), retention agent cationic polyacrylamide (1% of fiber mass) and alumina powder (25% of fiber mass) are added to obtain composite pulp; after long-net papermaking and forming, it is dried (two groups of drying cylinders are used for drying, among which the pressure of the rollers in the first group of drying cylinders is 100kg / cm, the drying cylinder temperature is 130℃, and the drying time is 20min; the pressure of the rollers in the second group of drying cylinders is 60kg / cm, the drying cylinder temperature is 100℃, and the drying time is 30min) and cut to obtain hollow paper tube base paper. The base paper is calendered to ensure the smoothness of the surface, with a total gram weight of 64 g / cm 3 .

[0022] 2) Heat-insulating layer: After the plant fiber (coniferous wood pulp and hardwood wood pulp, the mass ratio is 5:5) and rock wool (accounting for 25% of the plant fiber) are mixed and pulped (beating degree 50°SR), wet strength agent polyamide epichlorohydrin resin (2% of the fiber mass) and retention agent cationic polyacrylamide (1% of the fiber mass) are added to obtain a composite pulp; after the long-web paper is formed and dried (two groups of drying cylinders are used for drying, among which the pressure of the rollers in the first group of drying cylinders is 100kg / cm, the drying cylinder temperature is 130℃, and the drying time is 20min; the pressure of the rollers in the second group of drying cylinders is 60kg / cm, the drying cylinder temperature is 100℃, and the drying time is 30min) and cut, the hollow paper tube heat-insulating layer base paper is obtained, with a gram weight of 50 g / cm 3 .

[0023] 3) Support layer: After the plant fiber (coniferous wood pulp and hardwood wood pulp, the mass ratio is 5:5) and basalt fiber (accounting for 30% of the plant fiber) are mixed and beaten (beating degree 50°SR), wet strength agent polyamide epichlorohydrin resin (2% of the fiber mass) and retention agent cationic polyacrylamide (1% of the fiber mass) are added to obtain a composite pulp; after forming by long-net copying, drying (two groups of drying cylinders are used for drying, among which the pressure of the roller in the drying cylinder of the first group of drying cylinders is 100kg / cm, the drying cylinder temperature is 130℃, and the drying time is 20min; the pressure of the roller in the drying cylinder of the second group of drying cylinders is 60kg / cm, the drying cylinder temperature is 100℃, and the drying time is 30min) and cutting, the base paper of the hollow paper tube support layer is obtained, with a gram weight of 50 g / cm 3 .

[0024] 4) Composite: The low retention layer, the heat-resistant layer and the support layer are spirally formed and rolled into a hollow tube.

[0025] Comparative Example 1 The plant fibers (coniferous wood pulp and hardwood wood pulp, mass ratio of 5:5) were mixed and beaten (beating degree 50°SR), and wet strength agent polyamide epichlorohydrin resin (2% of fiber mass) and retention agent cationic polyacrylamide (1% of fiber mass) were added to obtain composite pulp; after forming by long-wire copying, drying (two groups of drying cylinders were used for drying, wherein the pressure of the rollers in the drying cylinders of the first group of drying cylinders was 100kg / cm, the drying cylinder temperature was 130℃, and the drying time was 20min; the pressure of the rollers in the drying cylinders of the second group of drying cylinders was 60kg / cm, the drying cylinder temperature was 100℃, and the drying time was 30min) and slitting, the hollow paper tube base paper with a gram weight of 64 g / cm 3 , and is rolled into a hollow paper tube through spiral forming.

[0026]

Claims

1. A low-retention hollow tube for heated cigarettes, characterized in that: The multi-layer structure comprises at least one low retention layer, at least one heat-resistant layer and at least one support layer, and the innermost layer is the low retention layer.

2. The low-retention hollow tube for heated cigarettes according to claim 1, characterized in that: The low retention layer is made of paper doped with ceramic material or made of paper with a metal film on the surface.

3. The low-retention hollow tube for heated cigarettes according to claim 2, characterized in that: The ceramic material includes aluminum oxide and / or silicon carbide, and the doping amount of the ceramic material in the paper is 20-60wt%; The metal film comprises aluminum foil, and the mass ratio of the metal film to paper is 1:1 to 1:

2.

4. The low-retention hollow tube for heated cigarettes according to claim 2, characterized in that: When the low retention layer is composed of paper doped with ceramic material, its inner surface is calendered; when the low retention layer is composed of paper with a metal coating on the surface, its inner surface is a metal film.

5. The low-retention hollow tube for heated cigarettes according to claim 1, characterized in that: The heat-resistant layer is formed by mixing inorganic heat-insulating materials into paper or by paper with a phase-change material coating on the surface.

6. The low-retention hollow tube for heated cigarettes according to claim 5, characterized in that: The inorganic heat-insulating material comprises glass fiber and / or rock wool; the doping amount of the inorganic heat-insulating material in the paper is 20-40wt%; The phase change material includes polylactic acid; The coating thickness of the phase change material on the paper surface is 0.1 mm to 0.3 mm.

7. The low-retention hollow tube for heated cigarettes according to claim 1, characterized in that: The support layer is made of paper doped with basalt fibers.

8. The low-retention hollow tube for heated cigarettes according to claim 7, characterized in that: The doping amount of the basalt fiber is 20-40wt%.

9. A low-retention hollow tube for heated cigarettes according to any one of claims 1 to 8, characterized in that: It has a three-layer structure, which includes a low retention layer, a heat-resistant layer and a support layer from the inside to the outside.

10. Use of a low-retention hollow tube according to any one of claims 1 to 9 in heated cigarettes, characterized in that: It is used as a hollow cooling section with low interception function for heating cigarettes.

11. The use of a low-retention hollow tube in a heated cigarette according to claim 10, characterized in that: The hollow cooling section and the acetate filter rod section are butt-jointed and composited to form a filter rod.

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