Heating cigarette, low-interception hollow paper tube and preparation method of low-interception hollow paper tube

Abstract

The invention provides a low-interception hollow paper tube, and belongs to the technical field of tobacco heating. The low-interception hollow paper tube has a multi-layer structure and comprises at least one low-interception layer and at least one heat-resistant layer, wherein the innermost layer of the multi-layer structure is a low-interception layer, and the low-interception layer comprises paper and a smoothing agent coating formed on the inner surface of the paper. The invention further provides a preparation method of the low-interception hollow paper tube and a heated cigarette. According to the low-interception hollow paper tube, interception of aerosol on the inner wall of the paper tube can be reduced, meanwhile, heat can be prevented from being transmitted to the acetate fiber filter tip section, and the lip scalding problem is avoided.

Description

Technical Field

[0001] The present disclosure relates to the field of heated tobacco, and particularly to heated cigarettes, low-interception hollow paper tubes and methods for preparing the same. Background Art

[0002] Currently, there is a problem of relatively low aerosol smoke volume in heated cigarettes. Research shows that about 57% of the aerosol released from the tobacco section of a heated cigarette is intercepted in the hollow section, about 28% is intercepted in the acetate filter section, and only about 15% is released and inhaled by the human body. Therefore, there is a need for a heated cigarette that reduces aerosol interception. Summary of the Invention

[0003] 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-interception hollow paper tube and a method for preparing the same.

[0004] According to an embodiment of one aspect of the present disclosure, a low-interception hollow paper tube is provided, having a multi-layer structure, including: at least one low-interception layer and at least one heat-insulating layer; wherein, the innermost layer of the multi-layer structure is the low-interception layer, and the low-interception layer includes a paper and a smoothing agent coating formed on the inner surface of the paper.

[0005] According to an embodiment of another aspect of the present disclosure, a method for preparing a low-interception hollow paper tube is provided, including: forming a smoothing agent coating on the surface of a paper to obtain a low-interception layer; doping an aerogel powder material in the base paper pulp and papermaking to obtain a heat-insulating layer; rolling the low-interception layer and the heat-insulating layer, wherein the innermost layer is the low-interception layer.

[0006] According to an embodiment of still another aspect of the present disclosure, a heated cigarette is provided, including a low-interception hollow paper tube as a hollow cooling section.

[0007] According to the embodiment of the present disclosure, the low-interception 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 interception of the aerosol on the inner wall of the paper tube; the heat-insulating layer obtained by doping an aerogel powder material in the paper can prevent the loss of heat inside the hollow paper tube, prevent the aerosol from cooling and condensing and depositing on the inner wall of the hollow tube, further reduce the interception of the aerosol on the inner wall of the paper tube, and at the same time can also prevent heat from being transferred to the acetate filter section, avoiding the "lip burning" problem caused. Detailed Description of the Embodiments

[0008] In the following detailed description, for the sake of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present disclosure. However, obviously, one or more embodiments can also be implemented without these specific details. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present disclosure.

[0009] The terms used herein are merely for describing specific embodiments and are not intended to limit the present disclosure. The term "comprising" used herein indicates the presence of features, steps, operations, but does not exclude the presence or addition of one or more other features.

[0010] Currently, there is a common problem of low aerosol smoke volume in heated cigarettes, and most of the aerosol is intercepted in the hollow section. In realizing the inventive concept of the present disclosure, it is found that there may be two reasons. On the one hand, the aerosol cools down, condenses and deposits 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 during continuous movement and collision. Among them, the water in the aerosol is mainly deposited on the inner wall of the hollow section by heat diffusion and condensation; glycerol is mainly physically intercepted on the inner wall of the hollow section by the impact of air flow; nicotine is affected by both factors in a ratio of about 1:1. Therefore, the inventor proposes a low-interception hollow paper tube, which reduces the interception of the aerosol in the hollow section through the low-interception layer and the heat-insulating layer therein.

[0011] Specifically, according to an embodiment of one aspect of the present disclosure, there is provided a low-interception hollow paper tube having a multi-layer structure, including: at least one low-interception layer and at least one heat-insulating layer; wherein, the innermost layer of the multi-layer structure is the low-interception layer, and the low-interception layer includes a paper and a smoothing agent coating formed on the inner surface of the paper.

[0012] According to the embodiment of the present disclosure, the low-interception 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 effect of the aerosol, and reduce the interception of the aerosol on the inner wall of the paper tube; the heat-insulating layer outside the low-interception layer can prevent the heat dissipation inside the hollow paper tube, prevent the aerosol from cooling down, condensing and depositing on the inner wall of the hollow tube, further reducing the interception of the aerosol on the inner wall of the paper tube, and at the same time can also prevent the heat from being transferred to the acetate fiber filter tip section, avoiding the "lip-scalding" problem caused.

[0013] According to the embodiment of the present disclosure, the smoothing agent includes nanocellulose and / or carboxymethyl cellulose.

[0014] According to the embodiment of the present disclosure, nanocellulose and carboxymethyl cellulose are used to form a dense smooth layer (smoothing agent coating) on the paper surface, which has low cost, good water solubility, is convenient to use in production, and has high crystallinity and good mechanical properties, which can improve the strength of the paper and prevent the penetration of gas and liquid.

[0015] According to the embodiment of the present disclosure, the heat-insulating layer includes a paper containing an aerogel powder material.

[0016] According to embodiments of the present disclosure, the aerogel powder material may include silica aerogel powder, carbon aerogel powder, metal oxide aerogel powder, organic aerogel powder, etc. The addition of the aerogel powder material can improve the heat insulation performance of the paper, thereby reducing the condensation deposition of the aerosol in the hollow paper tube.

[0017] According to an embodiment of another aspect of the present disclosure, a method for preparing a low-retention hollow paper tube is provided, including: forming a sizing agent coating on the paper surface to obtain a low-retention layer; doping an aerogel powder material in the base paper pulp and papermaking to obtain a heat insulation layer; rolling the low-retention layer and the heat insulation layer, with the innermost layer being the low-retention layer.

[0018] According to embodiments of the present disclosure, in the above method, the sizing agent includes nanocellulose and / or carboxymethyl cellulose, and the coating amount thereof is 0.1~2 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 .

[0019] According to embodiments of the present disclosure, if the coating amount of the sizing agent is too low, it is not conducive to reducing the retention of the aerosol on the inner wall of the hollow paper tube; if the coating amount of the sizing agent is too high, it will affect the physical properties such as the hardness and resilience of the paper tube, and also increase the production cost.

[0020] According to embodiments of the present disclosure, in the above method, the mass ratio of the aerogel powder material in the pulp is 15~20%, for example, 16%, 17%, 18%, 19%.

[0021] According to embodiments of the present disclosure, if the mass ratio of the aerogel powder material in the pulp is too low, it is not conducive to improving the heat insulation performance of the heat insulation layer; if the mass ratio of the aerogel powder material in the pulp is too high, it will affect the physical properties such as the hardness and resilience of the paper tube, and also increase the production cost.

[0022] According to embodiments of the present disclosure, in the above method, the particle size of the aerogel powder material is 2~40 μm, for example, 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm and 25 μm.

[0023] According to embodiments of the present disclosure, if the particle size of the aerogel powder material is too large, the retention rate will be low during the process of preparing the paper, resulting in waste; if the particle size of the aerogel powder material is too small, it is not conducive to improving the heat insulation performance of the heat insulation layer.

[0024] According to an embodiment of the present disclosure, in the above method, forming a sizing agent coating on the paper surface to obtain a low interception layer includes: providing pulp, the pulp includes plant fibers, wet strength agent and retention aid, wherein the plant fibers include hardwood pulp and softwood pulp; after forming the pulp, forming a sizing agent coating on its surface, and then drying to obtain a low interception layer.

[0025] According to an embodiment of the present disclosure, in the above method, doping aerogel powder material into the base paper pulp and papermaking to obtain a heat insulation layer includes: providing pulp, the pulp includes plant fibers, basalt fibers, wet strength agent, retention aid and aerogel powder material, wherein the mass ratio of plant fibers to basalt fibers is about 10:1 to 2:1; forming and drying the pulp to obtain a heat insulation layer.

[0026] According to an embodiment of the present disclosure, the plant fibers may include hardwood pulp and softwood pulp with a mass ratio of 4:6 to 5:5.

[0027] According to an embodiment of the present disclosure, the wet strength agent includes polyamide epichlorohydrin resin, and the addition amount is 2-6% of the mass of the pulp.

[0028] According to an embodiment of the present disclosure, the retention aid includes cationic polyacrylamide, and the addition amount is 0.05-2% of the mass of the pulp.

[0029] According to an embodiment of the present disclosure, the pulp forming includes a fourdrinier papermaking process.

[0030] According to an embodiment of the present disclosure, after the paper is formed and pressed, it is dried and slit to obtain the base paper for paper tubes. Drying includes: drying with two groups of drying cylinders, wherein the pressure of the internal support rollers of the drying cylinders in the first group is 80-100 kg·cm -1 , the drying cylinder temperature is 110-130 °C, and the drying time is 10-20 min; the pressure of the internal support rollers of the drying cylinders in the second group is 40-60 kg·cm -1 , the drying cylinder temperature is 80-100 °C, and the drying time is 20-30 min.

[0031] According to an embodiment of another aspect of the present disclosure, there is provided a heated cigarette, including the above-mentioned low interception hollow paper tube as a hollow cooling section.

[0032] The present disclosure will be further described in detail below with reference to specific embodiments.

[0033] Example 1

[0034] Provide pulp, including plant fibers, which include softwood pulp and hardwood pulp with a mass ratio of 5:5; mix the slurries and beat them to make the beating degree of the slurries 50°SR; add polyamide epichlorohydrin resin (wet strength agent) with a mass of 2% of the plant fibers and cationic polyacrylamide (retention aid) with a mass of 1% of the plant fibers to obtain a composite slurry; provide an aqueous solution of carboxymethyl cellulose with a mass concentration of 1%, after the composite slurry is formed by Fourdrinier papermaking, coat the aqueous solution of the above carboxymethyl cellulose on its surface, and the coating amount is 2 g·cm -2 ; Use two groups of dryer cylinders to dry the above materials. Among them, the pressure of the internal supporting rollers of the dryer cylinders in the first group is 100 kg·cm -1 , the temperature of the dryer cylinders is 130 °C, and the drying time is 20 min. The pressure of the internal supporting rollers of the dryer cylinders in the second group is 60 kg·cm -1 , the temperature of the dryer cylinders is 100 °C, and the drying time is 30 min; after cutting the above materials, obtain the base paper of the low retention layer, and the grammage is 47 g·cm -3 .

[0035] Provide pulp, including plant fibers and basalt fibers with a mass ratio of 10:3, where the plant fibers include softwood pulp and hardwood pulp with a mass ratio of 5:5; mix the slurries and beat them to make the beating degree 50°SR; add aerogel powder with a mass of 20% of the fibers, polyamide epichlorohydrin (wet strength agent) with a mass of 2% of the fibers, and polyacrylamide (retention aid) with a mass of 1% of the fibers to obtain a composite slurry; after the composite slurry is formed into a sheet, use two groups of dryer cylinders to dry the above materials. Among them, the pressure of the internal supporting rollers of the dryer cylinders in the first group is 100 kg·cm -1 , the temperature of the dryer cylinders is 130 °C, and the drying time is 20 min. The pressure of the internal supporting rollers of the dryer cylinders in the second group is 60 kg·cm -1 , the temperature of the dryer cylinders is 100 °C, and the drying time is 30 min; after cutting the above materials, obtain the base paper of the heat insulation layer, and the grammage is 50 g·cm -3 .

[0036] Roll the above low retention layer and heat insulation layer through spiral forming to obtain a hollow paper tube, where the innermost layer is the low retention layer.

[0037] Example 2

[0038] The difference from Example 1 is that in the preparation of the low retention layer, the coating amount of the aqueous solution of carboxymethyl cellulose is 1.5 g·cm -2 , and the grammage of the base paper of the low retention layer is 45 g·cm -3 ; in the preparation of the heat insulation layer, the addition amount of aerogel powder is 25% of the fiber mass, and the grammage of the base paper of the heat insulation layer is 45 g·cm-3 。

[0039] Comparative Example 1

[0040] It is different from Example 2 in that in the preparation of the low-retention layer, the coating amount of the aqueous solution of carboxymethyl cellulose is 0.05 g·cm -2 ; in the preparation of the heat-insulating layer, the addition amount of the aerogel powder is 1% of the mass of the fiber.

[0041] Comparative Example 2

[0042] Pulps are provided, including plant fibers, which include softwood pulp and hardwood pulp with a mass ratio of 5:5; the pulps are mixed and beaten so that the beating degree of the pulp is 50°SR; 2% of polyamide epichlorohydrin resin (wet strength agent) by mass of the plant fibers and 1% of cationic polyacrylamide (retention aid) by mass of the plant fibers are added to obtain a composite pulp; after the composite pulp is formed by Fourdrinier papermaking, two groups of dryer cylinders are used to dry the above materials. Among them, the pressure of the internal supporting roller of the dryer cylinder in the first group is 100 kg·cm -1 , the dryer cylinder temperature is 130 °C, and the drying time is 20 min. The pressure of the internal supporting roller of the dryer cylinder in the second group is 60 kg·cm -1 , the dryer cylinder temperature is 100 °C, and the drying time is 30 min; after the above materials are cut, base paper is obtained, with a grammage of 64 g·cm -3 ; the base paper is spirally wound to obtain a hollow paper tube.

[0043] The hollow paper tubes prepared in the examples and comparative examples are rolled and joined into a heated cigarette with a circumference of 21 mm and a filter ventilation of 50%, and are sucked using a smoking machine. The main components nicotine, moisture, and glycerol intercepted in the hollow paper tubes are determined by gas chromatography according to the recommended method of CORESTA No. 84. The results are shown in Table 1.

[0044] Table 1

[0045]

[0046] According to Table 1, the interception amounts of moisture, glycerol, and nicotine in Comparative Example 2 are higher than those in Example 1, Example 2, and Comparative Example 1, which can prove that using a hollow paper tube including a low-retention layer and a heat-insulating layer with the low-retention layer in the innermost layer can significantly reduce the interception of aerosol on the inner wall of the paper tube; the interception amounts of moisture, glycerol, and nicotine in Comparative Example 1 are higher than those in Example 1 and Example 2, which can prove that within the range of the coating amount of the smoothing agent being 0.1~2 g·cm -2 , and the mass proportion of the aerogel powder material in the pulp being 15~25%, the interception amount of aerosol on the inner wall of the paper tube can be significantly reduced without causing waste.

[0047] The specific embodiments described above further elaborate on the objective, technical solutions, and beneficial effects of the present disclosure. It should be understood that the above are only specific embodiments of the present disclosure and are not used to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present disclosure shall be included within the protection scope of the present disclosure.

Claims

1. A low-retention hollow paper tube having a multi-layer structure, comprising: at least one low retention layer and at least one thermal barrier layer; The innermost layer of the multi-layer structure is a low retention layer, and the low retention layer includes paper and a smoothing agent coating formed on the inner surface of the paper.

2. The low-retention hollow paper tube according to claim 1, wherein: The smoothing agent includes nanocellulose and / or carboxymethyl cellulose.

3. The low-retention hollow paper tube according to claim 1, wherein: The heat-resistant layer includes paper containing aerogel powder material.

4. A method for preparing a low-retention hollow paper tube as claimed in any one of claims 1 to 3, comprising: Forming a smoothing agent coating on the paper surface to obtain a low retention layer; The base paper pulp is mixed with aerogel powder material and paper is made to obtain a heat-insulating layer; The low retention layer and the heat-resistant layer are rolled, wherein the innermost layer is the low retention layer.

5. The method according to claim 4, wherein: The smoothing agent includes nanocellulose and / or carboxymethyl cellulose, and the coating amount is 0.1-2 g·cm -2 .

6. The method according to claim 4, wherein: The mass proportion of the aerogel powder material in the pulp is 15-20%.

7. The method according to claim 4, wherein: The particle size of the aerogel powder material is 2-40 μm.

8. The method according to claim 4, wherein: Forming a smoothing agent coating on the surface of paper to obtain a low retention layer includes: providing pulp, the pulp comprising plant fibers, a wet strength agent and a retention aid, wherein the plant fibers comprise hardwood pulp and softwood pulp; forming a smoothing agent coating on the surface of the pulp after forming treatment, and then drying the pulp to obtain the low retention layer.

9. The method according to claim 4, wherein: The method of mixing aerogel powder material into base paper pulp and making paper to obtain a heat-resistant layer comprises: providing pulp, wherein the pulp comprises plant fiber, basalt fiber, a wet strength agent, a retention aid and aerogel powder material, wherein the mass ratio of the plant fiber to the basalt fiber is 10:1 to 2:1; and molding and drying the pulp to obtain the heat-resistant layer.

10. A heated cigarette, comprising the low-retention hollow paper tube according to any one of claims 1 to 3 as a hollow cooling section.

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