An improved tubular airflow unit with a spiral channel

Abstract

The present invention discloses an improved tubular airflow unit with a spiral channel, including a heat absorbing layer and a heat insulating layer arranged from the inside to the outside, and also including a support member: the support member is located between the heat absorbing layer and the heat insulating layer and is spirally wound on the heat absorbing layer to form a spiral channel; and / or the support member is located outside the heat insulating layer and is spirally wound to form a spiral channel. The present invention has multiple spiral channel structures that can effectively disperse the flow path of smoke, and the spiral structure can extend the airflow path, and ultimately effectively reduce the mainstream smoke temperature and the surface temperature of the filter rod through lateral heat transfer; the end face of the present invention is a multi-channel structure, which can effectively resist the aroma-producing material from being pushed out by the heating plate; the present invention can fill a large amount of functional materials in its airflow channel, which can effectively give cigarettes aroma components and special functions, and improve the smoking taste and quality of cigarettes.

Description

Technical Field

[0001] The invention relates to an improved tubular airflow unit with a spiral channel, belonging to the technical field of cigarette materials. Background Art

[0002] When non-combustion smoking products are burned, the tobacco-containing substrate is heated by an instrument but not burned. The heating temperature generally does not exceed 300°C. However, the aerosol produced by it needs to be filtered at a lower temperature to meet the consumer's requirements for satisfaction and strength, so the airflow temperature reaching the mouth can reach more than 100°C. In order to achieve the purpose of reducing the temperature of the smoke, a hollow tube made of multiple folded paper layers by spiral rolling has been widely used as a cooling section. Patents such as "Smoking products with ventilated mouth end cavity" with publication number CN106455681A and "Multi-component filter tip and smoking product for smoking products" with patent number CN 105495685 all mention the use of hollow tubes in filter rods. Although hollow tubes are currently widely used, due to the high smoke flow rate and the limitations of the mouth rod length and material, some problems will arise during use. For example, because the flue gas flows through a straight channel in the hollow tube, the flue gas temperature drops slowly and the range of decrease is small; due to the lateral heat transfer when the overheated flue gas passes through, consumers feel their lips are burning when they inhale; in addition, the hollow tube is generally placed near the end of the flavor-producing material in the filter rod. When the heating plate is inserted into the flavor-producing material, the hollow structure of the hollow tube cannot resist the flavor-producing material well, so part of the flavor-producing material is pushed out by the heating plate.

[0003] In addition, the hollow tubes of the prior art are of a single form, and the flavors and functional materials attached to the hollow tubes are limited, and the functional characteristics that can be brought to the cigarettes are not obvious. Therefore, in view of the problems that arise, it is desired to provide a filter rod material that can effectively reduce the smoke temperature of mainstream smoke, and at the same time can give the cigarettes special flavors and functions, thereby improving the smoking quality. Summary of the invention

[0004] The present invention provides an improved tubular airflow unit with a spiral channel to solve the shortcomings of the existing overheated smoke channel being a straight channel, the pipeline being unable to well support the fragrance-producing material so that part of the fragrance-producing material is pushed out by the heating plate, and the fragrance and functional materials attached to the hollow tube are limited.

[0005] The tubular airflow unit with the spiral channel has a large aroma substance loading capacity, can effectively reduce smoke temperature, and improve the sensory smoking quality of cigarettes.

[0006] The technical solution of the present invention is: an improved tubular airflow unit with a spiral channel, comprising a heat absorbing layer 11 and a heat insulating layer 12 arranged from the inside to the outside, and also comprising a support member 13: the support member 13 is located between the heat absorbing layer 11 and the heat insulating layer 12 and is spirally wound on the heat absorbing layer 11 to form a spiral channel; and / or the support member 13 is located outside the heat insulating layer 12 and is spirally wound to form a spiral channel.

[0007] The heat absorbing layer 11 and the heat insulating layer 12 are spirally rolled to form a tubular structure.

[0008] The heat absorbing layer 11 is made of heat absorbing material, and the heat absorbing material includes one or more of wood pulp fiber, polylactic acid, polypropylene, and polyethylene glycol.

[0009] The heat insulating layer 12 is made of heat insulating material, and the heat insulating material includes one or more of cotton fiber, hemp fiber, silicate, graphite, and cellulose paper.

[0010] Functional material 14 is added into the spiral channel and distributed in a spiral shape.

[0011] The number of spiral channels between the heat absorption layer 11 and the heat insulation layer 12 is one or more: the functional material 14 is adhered to the walls of the heat absorption layer 11 and the heat insulation layer 12 in the spiral channel; or the functional material 14 is filled in the spiral channel between the heat absorption layer 11 and the heat insulation layer 12 in a spiral winding manner; the support member 13 does not intersect with the functional material 14;

[0012] The number of spiral channels formed by spiral winding outside the thermal insulation layer 12 is one or more: the functional material 14 is bonded to the outside of the thermal insulation layer 12 in a spiral winding manner.

[0013] The functional material 14 is one or more of linear, strip, sheet or granular materials.

[0014] The functional material 14 is one or more of cotton thread, hemp thread, cellulose strip, tobacco flakes, starch particles, activated carbon particles, plant particles, and gel particles.

[0015] The vertical angle between the center line of the support member 13 and the longitudinal direction of the improved tubular airflow unit 10 with a spiral channel is greater than 0° and less than 90°.

[0016] The width of the support member 13 is at least 10% and less than 90% of the outer circumference of the tubular airflow unit 10 with a spiral channel, and the thickness is at least 1.5 times and less than 5 times the thickness of the heat absorption layer 11 .

[0017] The beneficial effects of the present invention are:

[0018] 1) The improved tubular airflow unit with spiral channels provided by the present invention has multiple spiral channel structures that can effectively disperse the smoke flow path, and the spiral structure can extend the airflow path, ultimately effectively reducing the mainstream smoke temperature and the filter rod surface temperature through lateral heat transfer.

[0019] 2) The improved tubular airflow unit with a spiral channel provided by the present invention has a multi-channel structure at its end surface, which can effectively resist the fragrance-producing material from being pushed out by the heating plate.

[0020] 3) The improved tubular airflow unit with a spiral channel provided by the present invention can be filled with a large amount of functional materials in its airflow channel, which can effectively give the cigarette aroma components and special functions, and improve the smoking taste and quality of the cigarette. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the structure of the tubular airflow unit with a spiral channel in Example 1 (without adding functional materials);

[0022] Figure 2 Schematic diagram of the cross section of the tubular airflow unit with a spiral channel in Example 1 (without adding functional material);

[0023] Figure 3 Schematic diagram of the structure of a tubular airflow unit with a spiral channel in Example 2 (adding functional materials);

[0024] Figure 4 Schematic diagram of the cross section of the tubular airflow unit with spiral channel in Example 2 (addition of functional materials);

[0025] Figure 5 This is a graph showing the content of particulate matter components in mainstream smoke in Example 2;

[0026] Figure 6 Schematic diagram of the structure of a tubular airflow unit with a spiral channel in Example 3 (without adding functional materials);

[0027] Figure 7 Schematic diagram of the cross section of the tubular airflow unit with a spiral channel taken along line AB in Example 3 (without adding functional material);

[0028] Figure 8 Schematic diagram of the structure of a tubular airflow unit with a spiral channel in Example 4 (addition of functional materials);

[0029] Fig. 9 Schematic diagram of the cross section of the tubular airflow unit with spiral channels across HN in Example 4 (addition of functional materials);

[0030] Fig.10 This is a graph showing the content of particulate matter components in mainstream smoke in Example 4;

[0031] Fig.11 Schematic diagram of the cross section of the tubular airflow unit with a spiral channel in Example 5 (without adding functional material);

[0032] Fig.12 Schematic diagram of the cross section of the tubular airflow unit with a spiral channel in Example 6 (addition of functional materials);

[0033] Fig.13 This is a graph showing the content of particulate matter in mainstream smoke in Example 6;

[0034] Fig.14 is a schematic cross-sectional view of a tubular airflow unit with a spiral channel (without adding functional materials);

[0035] Fig.15 A schematic cross-sectional view of a tubular airflow unit with a spiral channel (with functional materials added);

[0036] The numbers in the figure are: 10-improved tubular airflow unit with spiral channel, 11-heat absorbing layer, 12-heat insulating layer, 13-supporting member, 14-functional material. DETAILED DESCRIPTION

[0037] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but the content of the present invention is not limited to the scope of the embodiments.

[0038] Example 1: Figure 1 , Figure 2 As shown, an improved tubular airflow unit with a spiral channel (a tubular airflow unit with a spiral channel having a circumference of 22.0 mm) includes a heat absorbing layer 11 and a heat insulating layer 12 arranged from the inside to the outside, and also includes a support member 13: the support member 13 is located between the heat absorbing layer 11 and the heat insulating layer 12 and is spirally wound on the heat absorbing layer 11 to form a spiral channel. The heat absorbing layer 11 is 100 μm thick, the heat insulating layer 12 is 70 μm thick, the support member 13 is 400 μm thick, and the width is 2 mm. There is a distance of 400 μm between the two functional layers. Four support members 13 are between the heat absorbing layer 11 and the heat insulating layer 12. The angle between the center line of each support member 13 and the vertical line of the improved tubular airflow unit 10 with a spiral channel is 5°. It is spirally rolled, and there are 4 spiral channels between the heat absorbing layer 11 and the heat insulating layer.

[0039] A composite filter rod of 10mm diacetate fiber + 20mm spiral channel tubular airflow unit repeating unit was prepared, and the filter tip and the flavor-producing substrate were rolled together using a rolling device to obtain a cigarette product. The spiral channel tubular airflow unit was located at the end of the flavor-producing material. Ordinary hollow tube cigarette products of the same specifications were prepared as control samples. Smoking was simulated according to the cigarette smoking model specified in the national standard YC / T29-1996, and the temperature of the upstream and downstream ends of the spiral channel tubular airflow unit and the control sample was detected using a K-type thermocouple temperature detection instrument during cigarette smoking. The test results are shown in Table 1.

[0040] Table 1 Mainstream smoke temperature detection results

[0041]

[0042] The test data in Table 1 clearly show that after the flue gas flows through the spiral channel tubular airflow unit, the temperature is reduced by 62.2°C, which is 21.6°C lower than the temperature of the ordinary hollow tube under the same conditions.

[0043] Example 2: Figure 3 , Figure 4 As shown, in this embodiment, based on embodiment 1, functional materials 14 are randomly added into the four spiral channels. In this embodiment, functional materials are added into the four spiral channels (when there are multiple spiral channels, one spiral channel can be randomly selected to add the functional material, or a number less than the number of spiral channels can be selected to add the functional material, or all spiral channels can be selected to add the functional material). The added functional material is activated carbon particles with a particle size of 100 mesh, which are glued to the walls of the heat absorption layer 11 and the heat insulation layer 12 in the airflow channel with glue during online molding.

[0044] A composite filter rod with a structure of 10mm diacetate fiber + 20mm spiral channel tubular airflow unit repeating unit was prepared. The filter tip and tobacco shreds were rolled together using a rolling device, and the tubular airflow unit with a spiral channel was located at the end of the aroma-producing material. Example 1 was used as a control sample. Smoking was simulated according to the cigarette smoking model specified in the national standard YC / T29-1996, and Cambridge filters were collected for GC-MS analysis. The mainstream smoke particulate matter components of the two samples were compared, and the analysis results are shown in Figure 5 .

[0045] The data in the figure show that compared with the spiral channel airflow unit sample without added activated carbon, the spiral channel tubular airflow unit with added activated carbon particles has caused a significant change in the chemical composition of the mainstream smoke of tobacco products, with a significant reduction in total particulate matter, tar, CO, benzopyrene, tobacco-specific nitrosamines and phenolic substances.

[0046] Example 3: Figure 6 , Figure 7As shown, an improved tubular airflow unit with a spiral channel (a tubular airflow unit with a spiral channel with a circumference of 22.5 mm) includes a heat-absorbing layer 11 and a heat-insulating layer 12 arranged from the inside to the outside, and also includes a support member 13: the support member 13 is located outside the heat-insulating layer 12 and is spirally wound to form a spiral channel. The heat-absorbing layer 11 is 300 μm thick, the heat-insulating layer 12 is 180 μm thick, the support member 13 is 500 μm thick and 9 mm wide, the heat-absorbing layer 11 is close to the heat-insulating layer 12, and one support member 13 is spirally wound outside the heat-insulating layer 12. The angle between the center line of the support member 13 and the longitudinal vertical line of the improved tubular airflow unit 10 with a spiral channel is 45°. After being wrapped with molding paper, a spiral channel is formed between the heat-insulating layer 12 and the molding paper.

[0047] A composite filter rod of diacetate fiber 6mm + spiral channel tubular airflow unit 24mm + diacetate fiber 4mm repeating unit was prepared. The filter tip and the flavor-producing substrate were rolled together using a rolling device to obtain a cigarette product. The spiral channel tubular airflow unit was located in the middle of the filter rod. Ordinary hollow tube cigarette products of the same specifications were prepared as control samples. Smoking was simulated according to the cigarette smoking model specified in the national standard YC / T29-1996. The temperature of the upstream and downstream ends of the spiral channel tubular airflow unit and the control sample was detected using a K-type thermocouple temperature detection instrument during cigarette smoking. The test results are shown in Table 2.

[0048] Table 2 Mainstream smoke temperature detection results

[0049]

[0050] The test data in Table 2 clearly show that after the flue gas flows through the spiral channel tubular airflow unit, the temperature is reduced by 50.6°C, which is 21.2°C lower than the temperature of the ordinary hollow tube under the same conditions.

[0051] Example 4: Figure 8 , Fig. 9 As shown, in this embodiment, on the basis of embodiment 3, a functional material is added in a spiral channel formed between the heat insulation layer 12 and the forming paper. The functional material 14 is a cellulose strip with mint essence attached, which is bonded to the outside of the heat insulation layer in a spiral winding manner. The winding angle of the cellulose strip in the spiral channel is consistent with the winding angle of the support member 13, that is, the angle between the center line of the cellulose strip and the longitudinal vertical line of the improved tubular airflow unit 10 with a spiral channel is 45°.

[0052] A composite filter rod with a structure of 6mm diacetate fiber + 24mm improved tubular airflow unit with spiral channel + 4mm diacetate fiber repeating unit was prepared. The filter tip and the flavor-producing material were rolled together using a rolling device, and the tubular airflow unit with spiral channel was located in the middle of the filter rod. The spiral channel airflow unit of Example 3 was used as a control sample. Smoking was simulated according to the cigarette smoking model specified in the national standard YC / T29-1996, and Cambridge filters were collected for GC-MS analysis. The mainstream smoke particulate matter components of the two samples were compared. The analysis results are shown in Fig.10 .

[0053] The data in the figure show that compared with the spiral channel airflow unit sample without the addition of cellulose strips loaded with mint flavor, the spiral channel airflow unit with the addition of cellulose strips loaded with mint flavor causes a significant change in the chemical composition of the mainstream smoke of the tobacco product, with a significant increase in the menthol content and a significant decrease in phenolic substances.

[0054] Example 5: Fig.11 As shown, an improved tubular airflow unit with a spiral channel (a tubular airflow unit with a spiral channel with a circumference of 23.3 mm) includes a heat absorption layer 11 and a heat insulation layer 12 arranged from the inside to the outside, and also includes a support member 13: the support member 13 is located between the heat absorption layer 11 and the heat insulation layer 12 and is spirally wound on the heat absorption layer 11 to form a spiral channel; and the support member 13 is located outside the heat insulation layer 12 and is spirally wound to form a spiral channel. The thickness of the heat-absorbing layer 11 is 400 μm, the thickness of the heat-insulating layer 12 is 200 μm, the heat-absorbing layer 11, the support member 13 and the heat-insulating layer 12 are alternately distributed, wherein the thickness of the support member 13 between the heat-absorbing layer 11 and the heat-insulating layer 12 is 1000 μm, and the width is 1.5 mm, the thickness of the support member 13 outside the heat-insulating layer 12 is 800 μm, and the width is 2 mm, the angle between the support member 13 and the vertical longitudinal direction of the improved tubular airflow unit 10 with a spiral channel is 80°, there are 3 support members 13 between the heat-absorbing layer 11 and the heat-insulating layer 12, forming 3 spiral channels; there are 3 support members 13 outside the heat-insulating layer 12, and after being wrapped by the molding paper, 3 spiral channels are formed between the heat-insulating layer 12 and the molding paper.

[0055] A composite filter rod of 10mm diacetate fiber + 20mm spiral channel tubular airflow unit repeating unit was prepared, and the filter tip and the flavor-producing substrate were rolled together using a rolling device to obtain a cigarette product. The spiral channel tubular airflow unit was located at the end of the flavor-producing material. Ordinary hollow tube cigarette products of the same specifications were prepared as control samples. Smoking was simulated according to the cigarette smoking model specified in the national standard YC / T29-1996, and the temperature of the upstream and downstream ends of the spiral channel tubular airflow unit and the control sample was detected using a K-type thermocouple temperature detection instrument during cigarette smoking. The test results are shown in Table 3.

[0056] Table 3 Mainstream smoke temperature detection results

[0057]

[0058] The test data in Table 3 clearly show that after the flue gas flows through the spiral channel tubular airflow unit, the temperature is reduced by 71.0°C, which is 31.2°C lower than the temperature of the ordinary hollow tube under the same conditions.

[0059] Example 6: Fig.12 As shown, on the basis of Example 5, a functional material is randomly added into a spiral channel between the heat absorption layer 11 and the heat insulation layer 12. The functional material is a tobacco sheet strip with a thickness of 800 μm and a width of 5 mm. The functional material is filled into the air flow channel cavity between the heat absorption layer 11 and the heat insulation layer 12 in a spiral winding manner. The winding angle of the tobacco sheet in the spiral channel is consistent with the winding angle of the support 13, that is, the angle between the center line of the tobacco sheet and the longitudinal vertical line of the improved tubular air flow unit 10 with a spiral channel is 80°. At the same time, a functional material is randomly added into a spiral channel between the heat insulation layer 12 and the forming paper. The functional material is a Chinese herbal medicine particle with a particle size of 80 meshes.

[0060] Prepare a composite filter rod of 10mm diacetate fiber + 20mm spiral channel tubular airflow unit repeating unit. Use a rolling device to roll the filter tip and the flavor-producing substrate together to obtain a cigarette product. The spiral channel tubular airflow unit is located at the end of the flavor-producing material. Take the sample of Example 5 as the control sample. According to the cigarette smoking model specified in the national standard YC / T29-1996, simulate smoking, collect Cambridge filters for GC-MS analysis, and compare the mainstream smoke particulate matter components of the two samples. The analysis results are shown in Fig.13 .

[0061] The data in the figure show that compared with the spiral channel airflow unit sample without adding tobacco flakes and Chinese herbal particles, the airflow channel unit with added tobacco flakes and Chinese herbal particles has caused significant changes in the chemical composition of the mainstream smoke of tobacco products, and the contents of aldehydes, ketones, terpenes, heterocyclics, benzene rings and phenols have all increased significantly.

[0062] In addition to the above embodiments, a schematic diagram is also provided in which the number of spiral channels between the heat absorption layer 11 and the heat insulation layer 12 is one; the number of spiral channels between the heat absorption layer 11 and the heat insulation layer 12 is multiple, such as Fig.14 , 15 When there are multiple spiral channels, one spiral channel can be randomly selected to add the functional material, or a number less than the number of spiral channels can be selected to add the functional material, or all spiral channels can be selected to add the functional material.

[0063] The tubular airflow unit 10 with a spiral channel is prepared by a spiral rolling process. After the heat absorption layer 11 and the heat insulation layer 12 are spirally rolled, a tubular structure is formed due to the absence of gaps. The support member 13 is spirally wound between the heat absorption layer 11 and the heat insulation layer 12 or the outermost layer of the tubular airflow unit with a spiral channel to form a spiral channel. The functional material 14 is distributed in the formed spiral channel in a spiral shape. The functional material 14 is added during the online molding of the improved tubular airflow unit 10 with a spiral channel (that is, added when the heat absorption layer 11, the heat insulation layer 12, and the support member 13 are integrally molded).

[0064] In addition to the given figures, the present application can also arbitrarily combine the following materials according to the following requirements: the heat absorption layer 11 adopts a heat absorption material, and the heat absorption material includes one or more of wood pulp fiber, polylactic acid, polypropylene, and polyethylene glycol (the heat absorption material can efficiently absorb, store or transfer heat to achieve the purpose of absorbing the flue gas temperature in the first time). The heat insulation layer 12 adopts a heat insulation material, and the heat insulation material includes one or more of cotton fiber, hemp fiber, silicate, graphite, and cellulose paper. The functional material 14 is one or more of linear, strip, sheet or granular materials, and the heat insulation material can play a role in blocking temperature. The functional material 14 is one or more of cotton thread (thread), hemp thread (thread), cellulose strip (strip), tobacco flake (flake), starch granule (granule), activated carbon granule (granule), plant granule (granule), gel granule (granule) (cotton thread, hemp thread, cellulose strip are high adsorption materials, and can also be used to carry fragrance by spraying or dipping liquid fragrance on them; tobacco flake is a flake formed by papermaking, dry process or rolling process; starch granule and activated carbon granule are porous granules). Granular materials have good adsorption effects; plant particles such as Chinese herbal medicine particles and plant leaf particles have their own fragrance and can also be used to carry fragrance; gel particles are fragrance-carrying particles prepared with PEG as raw material, with a large fragrance-carrying capacity, and their phase change function can have a significant cooling effect. The functional material 14 is added to provide the tubular airflow unit 10 with a spiral channel with special functions such as fragrance carrying, adsorption or cooling to improve the smoking quality of the cigarette; the functional material 14 is fixed in the spiral channel with an adhesive such as glue). During the addition of the functional material 14, the functional material 14 does not intersect with the support member 13 (i.e., they do not overlap), thereby avoiding changes in the circumference of the improved tubular airflow unit 10 with a spiral channel or causing the improved tubular airflow unit 10 with a spiral channel to be out of roundness.

[0065] The parameters such as size can be arbitrarily selected according to the following requirements: the width of the support member 13 is at least 10% and less than 90% of the outer circumference of the tubular airflow unit 10 with a spiral channel (i.e., the outermost circumference of the tubular airflow unit 10 of the entire spiral channel), and the thickness is at least 1.5 times and less than 5 times the thickness of the heat absorption layer 11 (the support member 13 is composed of thicker wood pulp fibers, and the thickness of the heat absorption layer 11 is 70 to 430 μm, preferably 100 to 350 μm; the thickness of the heat insulation layer 12 is The thickness is 70-350 μm, preferably 100-300 μm; the thickness of the support member 13 is 105-2150 μm, preferably 300-2000 μm); the longitudinal vertical angle between the center line of the support member 13 and the improved tubular airflow unit 10 with a spiral channel is greater than 0° and less than 90° (excluding 0° and 90°, which can avoid the airflow path being shorter and closer to a straight channel when the spiral angle is close to 0°; and avoid the airflow path being longer when the spiral angle is close to 90°).

[0066] According to application requirements, the tubular airflow unit 10 with a spiral channel may also have an outer layer. The outer layer is for meeting the performance requirements (such as hardness) of the tubular airflow unit 10 with a spiral channel, and may also be for meeting the appearance requirements of the tubular airflow unit 10 with a spiral channel, giving the tubular airflow unit 10 with a spiral channel a special brand appearance.

[0067] The specific implementation modes of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above implementation modes, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. An improved tubular airflow unit with a spiral channel, characterized in that: The invention comprises a heat absorbing layer (11) and a heat insulating layer (12) arranged from the inside to the outside, and also comprises a support member (13): the support member (13) is located between the heat absorbing layer (11) and the heat insulating layer (12) and is spirally wound on the heat absorbing layer (11) to form a spiral channel; and / or the support member (13) is located outside the heat insulating layer (12) and is spirally wound to form a spiral channel; the heat absorbing layer (11) and the heat insulating layer (12) are spirally rolled to form a hollow tubular structure; the center line of the support member (13) is aligned with the longitudinal direction of the improved tubular airflow unit (10) having the spiral channel. The vertical angle is greater than 0° and less than 90°; the heat absorbing layer (11) is made of a heat absorbing material, and the heat absorbing material includes one or more of wood pulp fiber, polylactic acid, polypropylene, and polyethylene glycol; the heat insulating layer (12) is made of a heat insulating material, and the heat insulating material includes one or more of cotton fiber, hemp fiber, silicate, graphite, and cellulose paper; the width of the support member (13) is at least 10% and less than 90% of the outer circumference of the tubular airflow unit (10) with a spiral channel, and the thickness is at least 1.5 times and less than 5 times the thickness of the heat absorbing layer (11).

2. The improved tubular airflow unit with a spiral channel according to claim 1, characterized in that: Functional material (14) is added into the spiral channel and distributed in a spiral shape.

3. The improved tubular airflow unit with a spiral channel according to claim 1, characterized in that: The number of spiral channels between the heat absorption layer (11) and the heat insulation layer (12) is one or more: the functional material (14) is adhered to the walls of the heat absorption layer (11) and the heat insulation layer (12) in the spiral channel; or the functional material (14) is filled in the spiral channel between the heat absorption layer (11) and the heat insulation layer (12) in a spiral winding manner; the support member (13) and the functional material (14) do not intersect; The number of spiral channels formed by spiral winding outside the thermal insulation layer (12) is one or more: the functional material (14) is bonded to the outside of the thermal insulation layer (12) in a spiral winding manner.

4. The improved tubular airflow unit with a spiral channel according to claim 2, characterized in that: The functional material (14) is one or more of linear, strip, sheet or granular materials.

5. The improved tubular airflow unit with a spiral channel according to claim 2, characterized in that: The functional material (14) is one or more of cotton thread, hemp thread, cellulose strips, tobacco flakes, starch particles, activated carbon particles, plant particles, and gel particles.

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