Aerosol generating product and preparation method therefor, and aerosol generating system

Abstract

The present invention discloses an aerosol generating article, including an aerosol generating substrate for generating an aerosol; a first lumen segment connected to a downstream end of the aerosol generating substrate, wherein the first lumen segment is provided with a first cavity passing axially therethrough; and a second lumen segment disposed at a downstream end of the first lumen segment, wherein the second lumen segment is provided with a second cavity passing axially therethrough, and the first cavity communicates with the second cavity; wherein the first cavity and the second cavity are radially isolated from the outside; and a volume of the second cavity is greater than a volume of the first cavity, and a wall thickness of the second cavity is less than a wall thickness of the first cavity. The aerosol generating article of the present invention can reduce the aerosol temperature without affecting the smoke taste, and improve the consumer experience, with a simple process and low cost. The present invention further provides a preparation method for an aerosol generating article, and also discloses an aerosol generating system.

Description

TECHNICAL FIELD

[0001] The present invention relates to the field of tobacco products, in particular to an aerosol generating article, a preparation method therefor, and an aerosol generating system.BACKGROUND

[0002] With the improvement of people's health awareness, low-hazard cigarettes have now become a trend in the future development of tobacco. A principle of atomized tobacco products is that an aerosol generating substrate (mainly a tobacco feedstock) absorbs external heat provided by a heater, raises its own temperature and releases an aerosol. By only heating the aerosol generating substrate rather than combustion, harmful components generated by high temperature combustion of tobacco are reduced and the amount of sidestream smoke and ambient smoke released is also significantly reduced. Compared with electronic cigarettes, the aerosol generating substrate of atomized tobacco products uses a tobacco material as a main raw material, and the aroma of the atomized tobacco products is closer to that of traditional cigarettes, and thus, the atomized tobacco products are widely favored by consumers.

[0003] Currently, the main problems of the atomized tobacco products include poor smoking effects, insufficient fullness, high aerosol inlet temperature, and the like. The problems such as poor smoking effects and bland smoke taste are mainly related to factors such as the structural design of the atomized tobacco products, a formula of an aerosol generating substrate, and flavoring. The high aerosol inlet temperature is mainly due to the relatively short aerosol passage of the atomized tobacco products, the aerosol filtration effect is low, and the moisture content of the aerosol is high, which make consumers feel higher temperature.

[0004] A Chinese patent document with a publication number of CN104010531B discloses an aerosol generating article with using an aerosol generating device, which relates to an aerosol generating article and a method of using the aerosol generating article. The aerosol generating article includes an aerosol forming substrate for generating an inhalable aerosol when heated by an internal heating element of an aerosol generating device. The aerosol generating article also includes a cooling element using an aggregated biodegradable polymeric material, such as aggregated polylactic acid flakes. However, due to the complex overall structure of the aerosol generating article, the complex manufacturing process and high cost, manufacturing such multi-element aerosol generating articles typically requires quite complex manufacturing machinery and process techniques.

[0005] A hollow tubular structure combined with a ventilation technology is one of the effective means of reducing the aerosol temperature of the atomized tobacco products. When a mixture of air and aerosol particles flowing through the atomized tobacco products reaches a ventilation zone, external air sucked into a hollow tubular segment via the ventilation zone is mixed with the aerosol, rapidly reducing the temperature of the aerosol mixture. The ventilation zone is arranged at a certain distance from an upstream end of a mouthpiece section of the aerosol generating article, and a cooling section is effectively arranged next to upstream of the mouthpiece, which is helpful for the nucleation and growth of the aerosol particles.

[0006] For example, a patent with a publication number of CN113163850A discloses an aerosol generating article for generating an inhalable aerosol when heated, wherein the aerosol generating article includes a rod of an aerosol generating substrate and a hollow tubular segment at a position between the rod and a mouthpiece segment. The hollow tubular segment is longitudinally aligned with the rod and the mouthpiece segment. Further, the hollow tubular segment defines a cavity extending all the way to an upstream end of the mouthpiece segment. The aerosol generating article further includes a ventilation zone at a location along the hollow tubular segment that is less than about 18 mm from an upstream end of the hollow tubular segment. A wall thickness of a peripheral wall of the hollow tubular segment is less than about 1.5 mm. The rod of the aerosol generating substrate includes at least an aerosol former, wherein the rod of the aerosol generating substrate has at least about 10% of the aerosol former in terms of dry weight. However, this hollow tubular cooling method using a ventilation method has the result of diluting smoke, affecting the consumer experience, and at the same time, increasing the cost of manufacturing equipment, increasing the process complexity, and reducing the production efficiency.SUMMARY

[0007] An object of the present invention is to solve the problems of the current way of reducing the aerosol temperature of atomized tobacco products that the smoke is diluted, affecting the consumer experience, and the process is complicated, increasing the production cost. The present invention provides an aerosol generating article capable of reducing the aerosol temperature without affecting the smoke taste, improving the consumer experience and having a simple process and low cost.

[0008] To solve the above technical problems, an embodiment of the present invention discloses an aerosol generating article, including: an aerosol generating substrate for generating an aerosol; a first lumen segment connected to a downstream end of the aerosol generating substrate, wherein the first lumen segment is provided with a first cavity passing axially therethrough; and a second lumen segment disposed at a downstream end of the first lumen segment, wherein the second lumen segment is provided with a second cavity passing axially therethrough, and the first cavity communicates with the second cavity; wherein the first cavity and the second cavity are radially isolated from the outside; and a volume of the second cavity is greater than a volume of the first cavity, and a wall thickness of the second cavity is less than a wall thickness of the first cavity.

[0009] By adopting the above technical solution, a combination of "small cavity structure + large cavity structure", i.e. a combination of the first lumen segment of a small volume and the second lumen segment of a large volume is used, and at the same time, the wall thickness of the second cavity is less than the wall thickness of the first cavity, so that the pressure of the aerosol generated after heating can be reduced when passing through the first cavity to the second cavity, and a sudden change in the flow field is beneficial to enhancing convective heat transfer on the inner wall surface of the second cavity, thereby promoting a decrease in aerosol temperature; and at the same time, the thinner the wall thickness, the smaller the thermal resistance of the heat transfer, so when the smoke flows through the second cavity, heat exchange between the walls of the lumens and the external environment can be sufficiently performed, further improving the cooling effect. On the other hand, the smoke temperature is associated with both the smoking effect and fullness, and the effective reduction of the smoke temperature can also promote condensation atomization of smoke components, increasing the smoking effect and fullness.

[0010] As one specific embodiment, the aerosol generating article further includes a filter segment connected to a downstream segment of the second lumen segment, wherein an aerosol generated after the aerosol generating substrate is heated is able to sequentially pass through the first lumen segment, the second lumen segment and the filter segment.

[0011] As one specific embodiment, the volume of the second cavity and the volume of the first cavity satisfy the following condition: 1.5 ≤ V 2 V 1 ≤ 5 wherein V 1 is the volume of the first cavity and V 2 is the volume of the second cavity.

[0012] As one specific embodiment, the wall thickness of the second cavity is less than or equal to 1.5 mm.

[0013] As one specific embodiment, a length of the second lumen segment and / or a length of the filter segment is less than or equal to a length of the first lumen segment.

[0014] As one specific embodiment, the length of the first lumen segment, the length of the second lumen segment and the length of the filter segment further satisfy the following condition: L 3 L 1 + L 2 ≤ 0.5 wherein L 1 is the length of the first lumen segment, L 2 is the length of the second lumen segment, and L 3 is the length of the filter segment.

[0015] As one specific embodiment, the length of the first lumen segment and the length of the second lumen segment further satisfy the following condition: L 2 L 1 ≥ 1.5 wherein L 1 is the length of the first lumen segment and L 2 is the length of the second lumen segment.

[0016] As one specific embodiment, the aerosol generating substrate includes an aerosol former, wherein the content of the aerosol former in the aerosol generating substrate is at least 10% in terms of dry weight.

[0017] As one specific embodiment, a material of the first lumen segment, a material of the second lumen segment and a material of the filter segment include at least one of: cellulose acetate tows, polypropylene fiber tows, polylactic acid tows, and paper.

[0018] Another embodiment of the present application further discloses a preparation method for an aerosol generating article, used for preparing the aerosol generating article described above, and including the following steps of: forming the first lumen segment, the second lumen segment, and the filter segment separately; compounding the first lumen segment, the second lumen segment, and the filter segment into a ternary composite filter rod by using plug wrap paper; and compounding the ternary composite filter rod with the aerosol generating substrate into an aerosol generating article; wherein forming of the first lumen segment and / or the second lumen segment includes the following steps of: opening tows, spraying glycerol triacetate to the tows for treatment, and introducing the treated tows into a filter rod forming smoke cavity by a high-pressure nozzle for forming.

[0019] Another embodiment of the present application further discloses an aerosol generating system, including: the aerosol generating article described above; and an aerosol generating device including a heating element for heating an aerosol generating substrate to generate an aerosol.BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG. 1 shows a schematic structural diagram of an aerosol generating article according to an embodiment of the present invention; in the drawing: 10-aerosol generating substrate, 20-first lumen segment, 21-first cavity, 30-second lumen segment, 31-second cavity, and 40-filter segment. DETAILED DESCRIPTION

[0021] Implementation modes of the present invention are illustrated below by specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present invention according to the content disclosed in the specification. Although the description of the present invention will be introduced in conjunction with preferred embodiments, this does not represent that the features of the present invention are only limited to the embodiments. On the contrary, the description of the present invention in conjunction with the implementation modes is intended to cover other alternatives or modifications that may be derived based on the claims of the present invention. In order to thoroughly understand the present invention, the following description will contain many specific details. The present invention may also be implemented without using these details. In addition, in order to avoid confusing or obscuring the key point of the present invention, some specific details are omitted in the description. It should be noted that the embodiments of the present invention and the features in the embodiments may be combined with each other without conflicts.

[0022] It should be noted that in this description, like reference numerals and letters denote like items in the following figures, and therefore, once an item is defined in one figure, it need not be further defined and explained in the following figures.

[0023] In the description of this embodiment, it should be noted that the terms "inner", "bottom" and the like indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is conventionally placed in use, and are merely for ease of description of the invention and simplification of the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, and be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention.

[0024] The terms "first," "second," and the like are used only to distinguish descriptions and are not to be construed as indicating or implying relative importance.

[0025] In the description of this embodiment, it should also to be noted that the terms "arranged", "connected" and "connection" should be broadly understood unless expressly specified and defined otherwise, for example, it can be fixed connection, detachable connection or integrated connection; it can be mechanical connection or electric connection; and it can be direct connection or indirect connection through an intermediate medium, and may be internal communication of two elements. For those of ordinary skill in the art, the specific meaning of the above terms in this embodiment may be understood according to specific situations.

[0026] In order to make the objective, the technical solutions and the advantages of the present invention clearer, the implementation modes of the present invention are further described in detail in combination with the accompanying drawings.

[0027] This embodiment provides an aerosol generating article, referring to FIG. 1, including an aerosol generating substrate 10, a first lumen segment 20, a second lumen segment 30 and a filter segment 40, with one end, away from a mouth end, of the aerosol generating article being an upstream end, and one end, close to the mouth end, of the aerosol generating article being a downstream end, wherein the aerosol generating substrate 10, the first lumen segment 20, the second lumen segment 30 and the filter segment 40 are arranged in sequence from the upstream end to the downstream end (i.e. arranged in sequence in the X-direction in FIG. 1). Wherein the aerosol generating substrate 10 is used to generate an aerosol to be smoked by consumers. The first lumen segment 20 is connected to a downstream end of the aerosol generating substrate 10, and the first lumen segment 20 is provided with a first cavity 21 passing axially therethrough. The second lumen segment 30 is connected to a downstream end of the first lumen segment 20, and the second lumen segment 30 is provided with a second cavity 31 passing axially therethrough. The first cavity 21 and the second cavity 31 form a smoke channel. After the aerosol generating substrate 10 is heated to produce smoke, the smoke sequentially passes through the first lumen segment 20, the second lumen segment 30, and the filter segment 40, and the filter segment 40 is of a non-hollow structure, and is used for filtering harmful substances in the smoke. In this embodiment, the first cavity 21 and the second cavity 31 are radially isolated from the outside, i.e., the first cavity 21 and the second cavity 31 do not have ventilation features; and a wall thickness of the second cavity 31 is less than a wall thickness of the first cavity 21, and a volume of the second cavity 31 is greater than a volume of the first cavity 21.

[0028] In another specific embodiment, the aerosol generating substrate 10, the first lumen segment 20, the filter segment 40 and the second lumen segment 30 are arranged in sequence along the upstream end to the downstream end of the aerosol generating article, i.e., after the aerosol generating substrate 10 is heated to produce smoke, the smoke passes through the first lumen segment 20, the filter segment 40 and the second lumen segment 30 in sequence.

[0029] In particular, a heat exchange path between an aerosol in the first cavity 21 and / or the second cavity 31 and the external environment mainly includes three parts of convective heat exchange on the inner wall surface of the cavity, heat conduction in the wall and convective heat exchange between the outer wall surface and the environment. By adopting the above technical solution, a combination of "small cavity structure+large cavity structure", i.e. a combination of the first lumen segment 20 of a small volume and the second lumen segment 30 of a large volume is used, and at the same time, the wall thickness of the second cavity 31 is less than the wall thickness of the first cavity 21, so that the pressure of the aerosol generated after heating can be reduced when passing through the first cavity 21 to the second cavity 31, and a sudden change in the flow field is beneficial to enhancing convective heat transfer on the inner wall surface of the second cavity 31, thereby promoting a decrease in aerosol temperature; and at the same time, the thinner the wall thickness, the smaller the thermal resistance of the heat transfer, so when the smoke flows through the second cavity 31, heat exchange between the walls of the lumens and the external environment can be sufficiently performed, further improving the cooling effect. On the other hand, the smoke temperature is associated with both the smoking effect and fullness, and the effective reduction of the smoke temperature can also promote condensation atomization of smoke components, increasing the smoking effect and fullness.

[0030] Additionally, as described above, efficient cooling of the smoke can be achieved with the combination "small cavity structure + large cavity structure", holes need not to be perforated in the first lumen segment 20 or the second lumen segment 30, i.e., the first cavity 21 and the second cavity 31 are radially isolated from the outside, compared with the current way of additionally perforating a lumen segment to achieve cooling, the solution of this embodiment can avoid the problem of smoke dilution due to the introduction of outside air through the holes, i.e., the technical solution of this embodiment can take into account both the reduction of the aerosol temperature and the assurance of the smoke taste. On the other hand, both the first lumen segment 20 and the second lumen segment 30 are of hollow structures, which has less interception of an aerosol passing therethrough and ensures that as much aerosol as possible passes therethrough and is delivered to the consumers.

[0031] In particular, an inner diameter of the first cavity 21 may be correspondingly arranged according to a diameter of a tobacco segment to prevent axial displacement within the aerosol generating substrate 10 due to an excessively large inner diameter of the first cavity 21 during insertion of a heating element into the aerosol generating substrate 10, even resulting in loosening of a tobacco substance in the aerosol generating substrate 10, which is not conducive to heat transfer between the tobacco substances.

[0032] Exemplarily, the cross-sectional shapes of the first cavity 21 and the second cavity 31 include, but are not limited to, a circular shape, an elliptical shape, and a star shape. The cross-sectional shapes of the first cavity 21 and the second cavity 31 may be the same or different, which is not limited.

[0033] Further, the volume of the second cavity 31 and the volume of the first cavity 21 satisfy the following condition: 1.5 ≤ V 2 V 1 ≤ 5, wherein V 1 is the volume of the first cavity 21 and V 2 is the volume of the second cavity 31. The range of a ratio of the volume of the second cavity 31 to the volume of the first cavity 21 is mainly achieved by adjusting the inner diameter of the second cavity 31 and the length of the first lumen segment 20 and / or the second lumen segment 30 in the axial direction. Exemplarily, the first cavity has an inner diameter of 2.5 mm to 4.5 mm and the second cavity has an inner diameter of 3.5 mm to 6 mm. The outer diameter of the first cavity and the outer diameter of the second cavity (i.e., the outer diameter of the aerosol generating article) are not limited.

[0034] Exemplarily, the length of the first lumen segment 20 and / or the second lumen segment 30 is not less than 5 mm to facilitate processing and to ensure length stability.

[0035] Exemplarily, if the wall thickness of the first cavity 21 is W 1 and the wall thickness of the second cavity 31 is W 2 , then W 1 >W 2 , and W 2 ≤1.5 mm. Preferably, W 2 ≤1.2 mm. Since the heat exchange path between the aerosol in the first cavity 21 and / or the second cavity 31 and the external environment mainly includes convective heat exchange on the inner wall surface of the cavity, heat conduction in the wall, and convective heat exchange between the outer wall surface and the environment, the convective heat exchange coefficients of the inner and outer walls of the first cavity 21 and / or the second cavity 31 have little difference when the smoking environment conditions are similar. A thin-walled material has lower thermal conductivity, so the cooling effect is mainly dominated by the wall thickness of the thin wall, the thinner the wall thickness, the smaller the thermal resistance of the heat transfer, and the more sufficient the heat exchange between the smoke in the cavity and the external environment, the better the cooling effect. Therefore, reducing the wall thickness of the second cavity 31, i.e., increasing the inner diameter of the second cavity 31, is beneficial for reducing the aerosol temperature.

[0036] At the same time, as described above, the wall of the first lumen segment 20 needs to have the function of supporting the aerosol generating substrate 10, and if the inner diameter of the first cavity 21 is too large, the aerosol generating substrate 10 is prone to axial displacement when heated, even resulting in loosening of a tobacco substance in the aerosol generating substrate 10, which is not conducive to heat transfer between the tobacco substances. Therefore, the inner diameter of the first cavity 21 should not be too large. However, if the inner diameter of the first cavity 21 is too small, it is easy to cause the generated aerosol to be intercepted too much on the wall of the first lumen segment 20, affecting the smoke taste. Therefore, the relative ratio of the first cavity 21 to the second cavity 31 needs to meet a certain range in order to both reduce the temperature of the smoke and ensure the smoke taste while preventing the displacement of the aerosol generating substrate 10.

[0037] In particular, the wall thickness of the second cavity 31 is the smallest distance measured between its outer wall and the inner cavity wall. In practice, a distance at a given location is measured along a direction substantially perpendicular to the outer wall and the inner cavity wall of the second cavity 31. For cavity elements having a substantially circular cross section, the distance is substantially measured along the radial direction of the second cavity 31.

[0038] Exemplarily, in this embodiment, the length of the first lumen segment 20, the length of the second lumen segment 30 and the length of the filter segment 40 also satisfy the following conditions: L 1 ≤L 2 , and L 3 ≤L 2 , i.e., the length of the second lumen segment 30 is greater than the length of the first lumen segment 20 and the length of the filter segment 40, respectively. L 3 L 1 + L 2 ≤ 0.5 is further satisfied, i.e., the sum of the length of the first lumen segment 20 and the length of the second lumen segment 30 is greater than twice the length of the filter segment 40. Preferably, L 2 L 1 ≥ 1.5.

[0039] Wherein the first lumen segment 20 has a length L 1 , the second lumen segment 30 has a length L 2 , and the filter segment 40 has a length L 3 .

[0040] With this arrangement, the length of the second lumen segment 30 is increased, thus increasing the heat exchange time of the smoke in the second lumen segment 30, and better cooling of the smoke can be achieved.

[0041] The comparison of the aerosol capture amount and the outlet smoke temperature under different parameters of the aerosol generating article according to the embodiment of the present application is described in detail below.Embodiment 1

[0042] A sample 1 includes an aerosol generating substrate 10, a first lumen segment 20, a second lumen segment 30 and a filter segment 40, and has a diameter of 7.8 mm. The aerosol generating substrate 10 has a length of 13.5 mm, and the first lumen segment 20 has a length L 1 of 10 mm and a wall thickness W 1 of 2.1 mm; the second lumen segment 30 has a length L 2 of 12 mm and a wall thickness W 2 of 1.2 mm; and the filter segment 40 has a length L 3 of 8 mm. A ratio V 2 / V 1 of the volume V 2 of the second cavity 31 of the second lumen segment 30 to the volume V 1 of the first cavity 21 of the first lumen segment 20 is 2.9.

[0043] A sample 2 includes an aerosol generating substrate 10, a first lumen segment 20, a second lumen segment 30 and a filter segment 40, and has a diameter of 7.8 mm. The aerosol generating substrate 10 has a length of 13.5 mm, and the first lumen segment 20 has a length L 1 of 10 mm and a wall thickness W 1 of 2.1 mm; the second lumen segment 30 has a length L 2 of 12 mm and a wall thickness W 2 of 0.85 mm; and the filter segment 40 has a length L 3 of 8 mm. A ratio V 2 / V 1 of the volume V 2 of the second cavity 31 of the second lumen segment 30 to the volume V 1 of the first cavity 21 of the first lumen segment 20 is 3.6.

[0044] The aerosol generating article was used in conjunction with a heating smoking set, and when comparing the effects of the aerosol generating article samples, in order to ensure the consistency of smoking conditions, a smoking machine was used and a test was performed under certain parameters. One of the smoking methods was listed below, specifically: the above-mentioned atomized tobacco products were put into the same heating smoking set for smoking, and the parameters of the smoking machine were set (e.g., the bell-wave smoking was used, the smoking protocol was the Health Canada Intensive Smoking Regime, and the smoking capacity was 55 mL). The button pressing time of the heating smoking set was 2.4s, after an interval of 14.6s, a first puff was started, each puff was performed for 2s, after an interval of 28s, a next puff was performed, after the 8th puff, capture was ended, and aerosols of 8 puffs were captured per cigarette. A heating mode for the heating smoking set includes, but is not limited to, the use of electric heating, electromagnetic heating and infrared heating.

[0045] To compare the atomization effect of the aerosol generating article and the amount of chemicals smoked by a smoker from the aerosol, a glass fiber filter smoke trap was used to collect the aerosol for determining the aerosol collected mas, and the captured aerosol was used to determine the content of nicotine and other chemicals by gas chromatography. Also in order to compare the temperature perception of a consumer when smoking the aerosol generating article, a thermocouple was fixed at a distance of 1mm from the center of a smoke outlet of the aerosol generating article by using a thermocouple temperature measurement method, and the thermocouple was connected to a temperature data acquisition system for measuring the temperature of smoke at an outlet of a mouth end of the aerosol generating article during smoking. Table 1 Aerosol collected mass and outlet smoke temperature for samples in Embodiment 1NameV 2 / V 1 Aerosol collected mass (mg)Outlet smoke temperature (°C)Sample 12.931.062.1Sample 23.632.959.2

[0046] As can be seen from Table 1, in Embodiment 1, under the condition that other parameters are consistent, the reduction of the wall thickness of the second cavity 31, that is, the increase of the value of V 2 / V 1 , is beneficial for reducing the thermal resistance of heat transfer in the second cavity 31, and the more sufficient the heat exchange between the smoke inside the second cavity 31 and the external environment, the better the cooling effect. At the same time, the enlargement of the second cavity 31 also reduces the smoke interception by the second lumen segment 30, and the aerosol collected mass also increases.Embodiment 2

[0047] A sample 3 includes an aerosol generating substrate 10, a first lumen segment 20, a second lumen segment 30 and a filter segment 40, and has a diameter of 7.8 mm. The aerosol generating substrate 10 has a length of 13.5 mm, and the first lumen segment 20 has a length L 1 of 12 mm and a wall thickness W 1 of 2.1 mm; the second lumen segment 30 has a length L 2 of 10 mm and a wall thickness W 2 of 1.2 mm; and the filter segment 40 has a length L 3 of 8 mm. A ratio V 2 / V 1 of the volume V 2 of the second cavity 31 of the second lumen segment 30 to the volume V 1 of the first cavity 21 of the first lumen segment 20 is 2.0. The sample 3 was compared with the sample 1. Table 2 Aerosol collected mass and outlet smoke temperature for a control sample in Embodiment 2NameV 2 / V 1 Aerosol collected mass (mg)Outlet smoke temperature (°C)Sample 12.931.062.1Sample 32.030.464.7

[0048] As can be seen from Table 2, in Embodiment 2, the comparison between the sample 1 and the sample 3 is to maintain the wall thickness of the first cavity 21 and the wall thickness of the second cavity 31 the same, while adjusting the relative lengths of the first lumen segment 20 and the second lumen segment 30 (with the total length unchanged) so that the ratio V 2 / V 1 also changes. It can be seen from the comparison result that increasing the ratio V 2 / V 1 by increasing the length of the second lumen segment 30 and decreasing the length of the first lumen segment 20 also helps to increase the aerosol collected mass and effectively reduces the outlet smoke temperature. It is indicated that under the condition that the wall thickness of the first cavity 21 and the wall thickness of the second cavity 31 remain unchanged, the length of the first lumen segment 20 is shortened, reducing the interception effect on the smoke; and the lengthening of the second lumen segment 30 enhances the heat exchange of the smoke in the second cavity 31 and improves the cooling effect on the smoke.

[0049] That is, under the condition that the total length and outer diameter of the first lumen segment 20 and the second lumen segment 30 are the same, the cavity volume of the first lumen segment 20 and the cavity volume of the second lumen segment 30 are adjusted such that the ratio V 2 / V 1 is controlled within a set range, which is helpful to effectively reduce the outlet smoke temperature.

[0050] Specifically, it is manifested as increasing the length of the second lumen segment 30 or decreasing the wall thickness of the second cavity 31. That is, while keeping the other factors unchanged, the equivalent wall thickness of the second lumen segment 30 is reduced to reduce the heat transfer resistance of the cavity wall of the second cavity 31, i.e., the value of V 2 / V 1 is increased, which can promote smoke cooling. Or, under the condition of keeping the total length of the first lumen segment 20 and the second lumen segment 30 unchanged, the length L 1 of the first lumen segment 20 is reduced, and the length L 2 of the second lumen segment 30 is increased, so that the value of V 2 / V 1 is increased, and the smoke cooling can also be promoted. On the other hand, increasing the volume of the second cavity 31 of the second lumen segment 30 also reduces the interception of smoke by the material of the second cavity 31, ensuring that the consumer inhales an adequate amount of smoke.

[0051] In summary, this embodiment employs a combination of the first cavity 21 of a small volume and the second cavity 31 of a large volume, and the wall thickness and strength of the first cavity 21 of the small volume can avoid axial displacement of the tobacco substance that may occur during insertion of the heating element into the aerosol generating substrate. And the pressure of the aerosol generated after the aerosol generating substrate is heated is decreased when passing through the first cavity 21 of the small volume to the second cavity 31 of the large volume, the sudden change in the flow field is beneficial to enhancing the convective heat exchange of the smoke inside the second cavity 31 to promote the decrease of the temperature of the aerosol, improving the smoking effect and fullness; and at the same time, increasing the volume of the second cavity 31 can also reduce the interception of smoke by the second cavity 31, ensuring the smoke taste, and improving the smoking experience.

[0052] In general, most consumers can accept the outlet smoke temperature lower than 65°C, while consumers generally cannot accept the outlet smoke temperature higher than 70°C. As shown in Embodiment 1 and Embodiment 2, the technical solution of the embodiment of the present application enables the outlet smoke temperature to be lower than 65°C, so that the smoke temperature can be reduced without perforating and diluting the smoke, and the reduction of the outlet smoke temperature to a temperature suitable for smoking and the maintenance of the smoke taste can be taken into account, achieving the effect of improving the smoking experience.

[0053] Further, an outer layer of the aerosol generating article further includes a wrapper for wrapping the outer surfaces of the aerosol generating substrate 10, the first lumen segment 20, the second lumen segment 30 and the filter segment 40 such that the four parts are combined to form a whole. Exemplarily, the wrapper includes paper, and the wrapping paper used is preferably an air-impermeable material. The interior of the aerosol generating article may be combined by various parts so that different lengths of wrapping paper are selected. In another embodiment, there may also be no wrapping paper.

[0054] Further, the aerosol generating substrate 10 includes, but is not limited to, a tobacco substance, an aerosol former and a flavoring substance, wherein the content of the aerosol former in the aerosol generating substrate 10 is at least about 10% in terms of dry weight to enhance the smoking effect.

[0055] The tobacco substance includes, but is not limited to, cut tobacco, tobacco sheet shreds, tobacco particles, and a combination thereof. Exemplarily, the aerosol generating substrate 10 may include, for example, one or more of: powder, granules, pellets, fragments, thin strips, strips or sheets, with a material containing herbaceous plant leaves, tobacco leaves, tobacco ribs, reconstituted tobacco, homogenized tobacco, extruded tobacco, deciduous tobacco and expanded tobacco. The aerosol generating substrate 10 may be in a loose form, or may be provided in a suitable container or cartridge. Optionally, the aerosol generating substrate 10 may contain additional tobacco or non-tobacco volatile flavor compounds which are released upon heating of the substrate. The aerosol generating substrate 10 may also contain one or more capsules that, for example, include additional tobacco or non-tobacco volatile flavor compounds, and such capsules may be melted during heating of the aerosol generating substrate 10.

[0056] In particular, the homogenized tobacco refers to a material formed by agglomerating particulate tobacco. The homogenized tobacco may be in the form of a sheet. The homogenized tobacco may be formed by agglomerating particulate tobacco, and the particulate tobacco is obtained by grinding or otherwise crushing one or both of tobacco leaves and tobacco leaf stalks. Alternatively, or in addition, sheets of the homogenized tobacco material may include one or more of tobacco dust, tobacco fines and other particulate tobacco by-products formed during, for example, tobacco processing, operation, and transportation. The sheets of the homogenized tobacco material may include one or more intrinsic binders that are tobacco endogenous binders, one or more extrinsic binders that are tobacco exogenous binders, or a combination thereof, to help agglomerate the particulate tobacco. Alternatively, or in addition, the sheets of the homogenized tobacco material may include other additives including, but not limited to, tobacco and non-tobacco fibre, an aerosol former, a humectant, a plasticiser, spices, a filler, aqueous and non-aqueous solvents and a combination thereof.

[0057] Suitable foreign binders for inclusion in the sheets of the homogenized tobacco material for use in the aerosol generating substrate include, but are not limited to, gums such as guar gum, synthetic biopolymer gum, gum arabic and locust bean gum; cellulose binders such as hydroxypropyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, methyl cellulose and ethyl cellulose; polysaccharides such as starch, organic acids such as alginic acid, conjugate base salts of organic acids such as sodium alginate, agar, pectin, and a combination thereof.

[0058] Optionally, the aerosol generating substrate 10 may be provided on or embedded in a thermally stable carrier. The carrier may be in the form of powder, particles, pellets, fragments, thin strips, strips or sheets. Alternatively, the carrier may be a tubular carrier having a thin layer of solid substrate deposited on its inner surface or on its outer surface or on both its inner and outer surfaces. This tubular carrier may be formed of, for example, a paper or paper-like material, a non-woven carbon fiber mat, a low-mass open-mesh metal mesh or a perforated metal foil, or any other thermally stable polymer matrixes.

[0059] The aerosol generating substrate 10 can also be deposited on a surface of the carrier in the form of, for example, a sheet, foam, gel or slurry. The aerosol generating substrate 10 may be deposited on the entire surface of the carrier or, alternatively, may be deposited in a certain pattern so as to provide non-uniform flavour delivery during use.

[0060] Further, the first lumen segment 20, the second lumen segment 30, and the filter segment 40 are collectively referred to as a filter tip portion. The filter tip portion functions primarily to reduce the release of harmful substances as well as to reduce the temperature of the aerosol. In particular, the first lumen segment 20 and the second lumen segment 30 may be two separate lumen segments or may be two portions with different inner diameters in one lumen segment.

[0061] Further, a material of the first lumen segment 20, a material of the second lumen segment 30, and a material of the filter segment 40 include at least one of cellulose acetate tows, polypropylene fiber tows, polylactic acid tows, paper, and a polymer. Both the first lumen segment 20 and the second lumen segment 30 are of hollow structures, and have less interception of the aerosol flowing through the first cavity 21 and the second cavity 31, so as to ensure that the aerosol can pass through and is delivered to consumers as much as possible. The filter segment 40 is of a solid structure, and on one hand, filters harmful substances in the aerosol, e.g., functions to effectively reduce the release of harmful substances such as NNK, crotonaldehyde, phenol, HCN, ammonia, and BaP. Further, the filter segment 40 employs tows with high single denier and low total denier. Exemplarily, the single denier of the tows of the filter segment 40 is greater than or equal to 10 denier. Further, the single denier of the tows of the filter segment 40 is 22 denier. The total denier of the tows of the filter segment 40 is 27,000 denier to 35,000 denier, and further, the total denier is 32,000 denier. The total denier of the tows, also known as the total linear density of the tows, is a product quality indicator expressed by the weight value of tows with a certain length. On the premise of ensuring the support strength, using tows with high single denier but relatively low total denier can increase a spacing between the tows of the filter segment 40, reducing the interception of smoke components. With the above arrangement, the filter tip portion can minimize the interception of flavoring substances, nicotine and other substances on the premise of reducing harmful substances, ensuring the effective release of flavoring substances, nicotine and other substances, and ensuring sufficient supply of smoke components to consumers.

[0062] An embodiment of the present application further discloses a preparation method for an aerosol generating article, used for preparing the aerosol generating article described above. Exemplarily, during preparation, first, the first lumen segment 20, the second lumen segment 30 and the filter segment 40 are each formed, then the first lumen segment 20, the second lumen segment 30 and the filter segment 40 are compounded into a ternary composite filter rod by using plug wrap paper, and finally the ternary composite filter rod is compounded with the aerosol generating substrate 10 into an aerosol generating article by using tipping paper. The order in which the aerosol generating substrate 10, the first lumen segment 20, the second lumen segment 30 and the filter segment 40 are combined during preparation is not limited. In another embodiment, first, the aerosol generating substrate 10 and the first lumen segment 20 are combined to form a first combination, the second lumen segment 30 and the filter segment 40 are combined to form a second combination, and the first combination and the second combination are connected to form the aerosol generating article.

[0063] Exemplarily, forming of the first lumen segment 20 and the second lumen segment 30 includes the following steps of: opening tows, spraying glycerol triacetate to the tows for treatment, and introducing the treated tows into a filter rod forming smoke cavity by a high-pressure nozzle to achieve the forming of the first lumen segment 20 and the second lumen segment 30 (i.e., a hollow filter rod) in the forming smoke cavity. Specifically, the filter rod forming smoke cavity is composed of two parts, which are a high-temperature vapor rapid solidification section and a low-temperature cooling strip rapid cooling setting section, respectively, and a core rod for cavity setting of the hollow filter rod is arranged inside the smoke cavity. The core rod has a hollow structure, and the hollow core rod is located at a central position of the filter rod. By changing the cross-sectional shape of the hollow core rod, the cavity structures of different special-shaped hollow filter rods can be achieved.

[0064] An embodiment of the present application further discloses an aerosol generating system, including the aerosol generating article described above, and an aerosol generating device including a heating element for insertion into the aerosol generating substrate 10 to heat the aerosol generating substrate 10 to generate an aerosol.

[0065] Although the present invention has been illustrated and described with reference to some preferred embodiments of the present invention, those of ordinary skill in the art should understand that the above content is a further detailed description of the present invention in conjunction with the specific embodiments, and it cannot be considered that the specific implementations of the present invention are limited only by these descriptions. Those skilled in the art may make various changes in forms and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present

Claims

1. An aerosol generating article, <b>characterized by comprising: an aerosol generating substrate for generating an aerosol; a first lumen segment connected to a downstream end of the aerosol generating substrate, wherein the first lumen segment is provided with a first cavity passing axially therethrough; and a second lumen segment disposed at a downstream end of the first lumen segment, wherein the second lumen segment is provided with a second cavity passing axially therethrough, and the first cavity communicates with the second cavity; wherein the first cavity and the second cavity are radially isolated from the outside; and a volume of the second cavity is greater than a volume of the first cavity, and a wall thickness of the second cavity is less than a wall thickness of the first cavity.

2. The aerosol generating article according to claim 1, characterized by further comprising a filter segment connected to a downstream segment of the second lumen segment, wherein an aerosol generated after the aerosol generating substrate is heated is able to sequentially pass through the first lumen segment, the second lumen segment and the filter segment.

3. The aerosol generating article according to claim 1, characterized in that the volume of the second cavity and the volume of the first cavity satisfy the following condition: 1.5 ≤ V 2 V 1 ≤ 5 wherein V1 is the volume of the first cavity and V2 is the volume of the second cavity.

4. The aerosol generating article according to claim 1, characterized in that the wall thickness of the second cavity is less than or equal to 1.5 mm.

5. The aerosol generating article according to claim 2, characterized in that a length of the second lumen segment and / or a length of the filter segment is less than or equal to a length of the first lumen segment.

6. The aerosol generating article according to claim 5, characterized in that the length of the first lumen segment, the length of the second lumen segment and the length of the filter segment further satisfy the following condition: L 3 L 1 + L 2 ≤ 0.5 wherein L1 is the length of the first lumen segment, L2 is the length of the second lumen segment, and L3 is the length of the filter segment.

7. The aerosol generating article according to claim 5 or 6, characterized in that the length of the first lumen segment and the length of the second lumen segment further satisfy the following condition: L 2 L 1 ≥ 1.5 wherein L1 is the length of the first lumen segment and L2 is the length of the second lumen segment.

8. The aerosol generating article according to claim 1, characterized in that the aerosol generating substrate comprises an aerosol former, wherein the content of the aerosol former in the aerosol generating substrate is at least 10% in terms of dry weight.

9. The aerosol generating article according to claim 2, characterized in that a material of the first lumen segment, a material of the second lumen segment and a material of the filter segment comprise at least one of: cellulose acetate tows, polypropylene fiber tows, polylactic acid tows, and paper.

10. A preparation method for an aerosol generating article, used for preparing the aerosol generating article according to any one of claims 2-9, <b>characterized by comprising the following steps of: forming the first lumen segment, the second lumen segment, and the filter segment separately; compounding the first lumen segment, the second lumen segment, and the filter segment into a ternary composite filter rod by using plug wrap paper; and compounding the ternary composite filter rod with the aerosol generating substrate into an aerosol generating article; wherein forming of the first lumen segment and / or the second lumen segment comprises the following steps of: opening tows, spraying glycerol triacetate to the tows for treatment, and introducing the treated tows into a filter rod forming smoke cavity by a high-pressure nozzle for forming.

11. An aerosol generating system, <b>characterized by comprising: the aerosol generating article according to any one of claims 1-9; and an aerosol generating device comprising a heating element for heating the aerosol generating substrate to generate an aerosol.

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