Method for improving smoking stability of heated cigarette by using internal and external coupling heating method

Abstract

This invention relates to a method for improving the smoking stability of heated cigarettes using an internal and external coupling heating method, belonging to the field of heated cigarette technology. The method includes the following steps: heating the cigarette core using an internal and external coupling heating method. Initially, internal heating is the primary method. When the temperature of the heat source used for internal heating reaches the operating temperature, the temperature of the heat source used for internal heating and / or the temperature of the heat source used for external heating is adjusted to ensure that the volume of the portion of the cigarette core with a temperature greater than T / n increases uniformly. This method, by employing an internal and external coupling heating method and adjusting the temperature of the heat source used for internal heating and / or the temperature of the heat source used for external heating to achieve matching coupling of internal and external heating, aims to achieve a "slow release" of tobacco components in the cigarette core material, significantly improving the puff-by-puff release stability of the heated cigarette.

Description

Technical Field

[0001] This invention relates to a method for improving the smoking stability of heated cigarettes using an internal and external coupling heating method, and belongs to the field of heated cigarette technology. Background Technology

[0002] In recent years, heated cigarette products have developed rapidly. Heated cigarettes directly heat the cigarette core material through internal or external heating to generate an aerosol for consumers to inhale. Their advantages include better sensory quality of the atomized aerosol, closely resembling that of traditional cigarettes, and a more complete aroma. Currently, heated cigarettes all use either internal or external heating methods to heat the cigarette core material.

[0003] When heating cigarettes internally, the core material is heated from the inside out. Generally, the heat source used for internal heating rapidly raises the temperature to the initial maximum temperature (typically 250–380℃), quickly heating the core material and releasing tobacco components in a short time. This is then maintained at this temperature for a certain period to reach the operating temperature (typically 250–380℃). At the operating temperature, the heated area gradually expands, allowing for continuous release of tobacco components. With internal heating, a significant radial temperature gradient exists between the inside and outside of the core material, meaning the internal temperature is significantly higher than the external temperature. This results in insufficient release of tobacco components from the outer core material. While raising the internal temperature to increase the external temperature can improve the release of tobacco components from the outer core material, excessively high internal temperatures, exceeding the upper limit of the operating temperature, can increase the "burnt" taste of the core material. Therefore, under the internal heating method, the internal tobacco core material is heated to a higher temperature in the early stage of heating, resulting in a high release of tobacco components; in the later stage of heating, the tobacco components in the internal tobacco core material are almost completely released, while the external tobacco core material is heated to a lower temperature, resulting in a low release of tobacco components. This leads to the difference in the release of tobacco components before and after heating the cigarette under the internal heating method, causing the problem of unstable release of heated cigarette aerosol puff by puff.

[0004] When heated cigarettes are externally heated, the tobacco core material is heated from the outside in, with heat continuously transferred inwards, causing the tobacco components to be released continuously. Under external heating, due to the circumferential radiation characteristic of external heating, the heating of the inside and outside of the tobacco core material is basically the same, resulting in a relatively concentrated release of tobacco components from both the inside and outside of the tobacco core material. This leads to good tobacco component release in the early stages of heating. However, because the inside and outside of the tobacco core material are heated simultaneously, the slow-release effect of tobacco components deteriorates, resulting in insufficient release of tobacco components in the later stages of heating. This also leads to differences in the amount of tobacco components released before and after heating the cigarette under external heating, causing instability in the puff-by-puff release of heated cigarette aerosols.

[0005] The research results in the literature (Puff-by-puff release behavior of major components of heated tobacco smoke, Tobacco Science and Technology, 2019, 52(2):62-71) show that both internally heated tobacco products (IQOS) and externally heated tobacco products (GLO) exhibit significant puff-by-puff instability in terms of aerosol release, nicotine, glycerol, and flavor components, with the externally heated tobacco product showing more pronounced puff-by-puff instability. This indicates that it is difficult to achieve stable puff-by-puff aerosol release from heated tobacco products using a single heating method.

[0006] Improving the puff-by-puff release stability of heated cigarettes hinges on controlling the heating temperature, time, and area of ​​the cigarette core material to ensure dynamic heating and consistent tobacco component production before each puff. Chinese patent document CN208143515U discloses a cigarette electric heating device with replaceable heating elements. This device includes both an internal and an external heating element. The internal heating element is cylindrical, while the external heating element is annular. Because of the simultaneous use of internal and external heating elements, the heating method can be selected based on the specific situation when heating the cigarette. For example, a combined internal and external heating method, primarily using internal heating initially followed by external heating later, or simultaneously using both internal and external heating, can improve the user experience. While this patent document mentions the possibility of external and / or internal heating, it does not disclose how to effectively improve the puff-taking stability of heated cigarettes. Summary of the Invention

[0007] The purpose of this invention is to provide a method for improving the smoking stability of heated cigarettes by using an internal and external coupling heating method, which can solve the problem of poor stability of aerosol release during each puff of heated cigarettes.

[0008] To achieve the above objectives, the technical solution adopted by the present invention for improving the smoking stability of heated cigarettes using an internal and external coupling heating method is as follows:

[0009] A method for improving the smoking stability of heated cigarettes using an internal and external coupling heating method includes the following steps: heating the cigarette core using an internal and external coupling heating method; the internal and external coupling heating refers to a heating method in which internal heating is the main method in the early stage of heating, and external heating is the main method in the later stage of heating, or both internal heating and external heating are used simultaneously in the later stage of heating; in the early stage of heating, the temperature of the heat source used for internal heating is first raised to the highest starting temperature, then cooled to the initial value of the early working temperature, and then the temperature is raised to ensure that the volume of the part of the cigarette core with a temperature greater than T0 / n continues to increase. During the temperature rise, the temperature of the heat source used for internal heating is controlled within the range of the early working temperature. When it is no longer possible to continue raising the temperature of the heat source used for internal heating to ensure that the volume of the part of the cigarette core with a temperature greater than T0 / n continues to increase, the later stage of heating begins, and external heating is turned on or the temperature of the heat source used for external heating is raised to ensure that the volume of the part of the cigarette core with a temperature greater than T0 / n continues to increase. T0 is the initial value of the early working temperature of the heat source used for internal heating, and n is greater than 1.

[0010] The method for improving the smoking stability of heated cigarettes of the present invention adopts an internal and external coupling heating method, and achieves matching coupling of internal and external heating by adjusting the temperature of the heat source used for internal heating and / or the temperature of the heat source used for external heating. This ensures that the volume of the part of the heated cigarette core with a temperature greater than T0 / n continuously increases, and can control the dynamic and continuous increase of the heated area of ​​the heated cigarette. This allows the internal and external heating of the core material to cooperate with each other, achieving the purpose of "slow release" of tobacco components in the core material, and can significantly improve the puff release stability of heated cigarettes.

[0011] In this invention, "mainly using internal heating in the early stage of heating" means that only internal heating is used in the early stage of heating, or that both internal heating and external heating are used in the early stage of heating. When both internal heating and external heating are used in the early stage of heating, it is necessary to ensure that the temperature of the heat source used for internal heating is greater than the temperature of the heat source used for external heating.

[0012] In this invention, "external heating as the main method in the later stage of heating" means that only external heating is used in the later stage of heating, or that both external heating and internal heating are used in the later stage of heating. When both external heating and internal heating are used in the later stage of heating, it is necessary to ensure that the temperature of the heat source used for external heating is greater than the temperature of the heat source used for internal heating.

[0013] In this invention, "simultaneous use of internal and external heating in the later stages of heating" means that both external and internal heating methods are used simultaneously in the later stages of heating.

[0014] In this invention, the temperature changes of the heat source used for internal heating and the heat source used for external heating over time are as follows: Figure 1As shown, internal heating represents the temperature change of the heat source used for internal heating over time, while external heating represents the temperature change of the heat source used for external heating over time. In this invention, the temperature of the cigarette core decreases radially from the inside out, and the temperature in the middle of the cigarette core is higher than that at both ends. A schematic diagram of the temperature at different positions of the cigarette core at a certain point in time is shown below. Figure 2 As shown.

[0015] Preferably, the highest starting temperature of the heat source used for internal heating is 30 to 80°C higher than the initial value of the previous operating temperature of the heat source used for internal heating.

[0016] The maximum starting temperature of the heat source used for internal heating can be determined based on the additive content and density of the tobacco core material, or it can be determined through experiments. Preferably, the maximum starting temperature of the heat source used for internal heating is 230 to 380°C.

[0017] Preferably, the time required to raise the temperature of the heat source used for internal heating to the highest starting temperature is no more than 35 seconds.

[0018] Preferably, after the temperature of the heat source used for internal heating reaches the highest initial temperature, it is held at that temperature for 0.05 to 0.1 minutes. For example, after the temperature of the heat source used for internal heating reaches the highest initial temperature, it is held at that temperature for 5 to 6 seconds.

[0019] Preferably, the initial operating temperature of the heat source used for internal heating is 200–380°C. It can be understood that the minimum initial operating temperature of the heat source used for internal heating is 200°C, and the maximum initial operating temperature is 380°C.

[0020] In this invention, when it is no longer possible to continue increasing the temperature of the heat source used for internal heating to ensure that the volume of the portion of the cigarette core with a temperature greater than T0 / n continues to increase, it means that the temperature of the heat source used for internal heating exceeds the maximum value of the initial operating temperature of the heat source used for internal heating.

[0021] Preferably, during the initial heating phase, the temperature of the heat source used for external heating is within the initial operating temperature range, and the initial operating temperature of the heat source used for external heating is no greater than 200°C. It can be understood that the initial operating temperature of the heat source used for external heating is between room temperature and 200°C.

[0022] Preferably, during the later stages of heating, the temperature of the heat source used for internal heating is within the later operating temperature range, and the temperature of the heat source used for external heating is within the later operating temperature range; the later operating temperature of the heat source used for internal heating is 100–380°C, and the later operating temperature of the heat source used for external heating is 100–380°C.

[0023] Preferably, the continuous increase is a uniform increase.

[0024] In this invention, by adjusting the heating method at different heating stages, the heated cigarette is first heated mainly by internal heating to release tobacco components in the early stage, and then mainly by external heating to release tobacco components in the later stage. By using a coupled internal and external heating method to release tobacco components, the consistency of tobacco component release is achieved throughout the entire heating process.

[0025] Preferably, n is 2, 3, or 4.

[0026] Preferably, n is 2. After the temperature of the heat source used for internal heating drops to the initial value of the previous working temperature, the ratio of the volume of the portion of the cigarette core with a temperature greater than T0 / 2 to the total volume of the cigarette core is defined as f. V50％T Ensuring that the volume of the portion of the heated cigarette core with a temperature greater than T0 / n continuously increases means ensuring that f V50％T It increases at a constant rate.

[0027] Preferably, ensure f V50％T A uniform increase means ensuring that f V50％T The increment is a constant value at regular intervals, and the regular interval is no more than 30 seconds.

[0028] Preferably, the setpoint is 5% to 20%. It is understood that the setpoint of 5% to 20% refers to a value within the range of 5% to 20%, for example, 5%, 10%, or 20%.

[0029] Preferably, a cigarette heating device with internal and external heating elements is used to heat the cigarette core. When selecting a cigarette heating device with internal and external heating elements, existing cigarette heating devices can be used, such as the cigarette heating device disclosed in Chinese patent document CN208143515U.

[0030] The inner heating element is adjacent to or in contact with the interior of the cigarette core, and the outer heating element is also adjacent to or in contact with the cigarette core. Therefore, the surface temperature of the inner heating element is the same as the interior temperature of the cigarette core, and the surface temperature of the outer heating element is the same as the exterior temperature of the cigarette core. To obtain the surface temperatures of the inner and outer heating elements in real time, and thus control the temperature of the cigarette core during the heating process, preferably, the cigarette heating appliance includes a temperature measuring device for detecting the surface temperatures of the inner and outer heating elements.

[0031] In this invention, the temperature of the inner heating element surface refers to the temperature of a surface of the inner heating element that is adjacent to or in contact with the cigarette core, and the temperature of the outer heating element surface refers to the temperature of a surface of the outer heating element that is adjacent to or in contact with the cigarette core.

[0032] Preferably, the temperature measuring device is an ultrafine thermocouple.

[0033] Preferably, the diameter of the temperature measuring probe of the ultrafine thermocouple is less than 0.2 mm.

[0034] Preferably, the f V50％T The calculation method is as follows:

[0035] When T in >T out hour,

[0036] When T in <T out hour,

[0037] In the formula, T in T represents the surface temperature of the internal heating element. out T0 is the surface temperature of the external heating element, R is the initial operating temperature of the heat source used for internal heating, and r is the inner diameter of the external heating element.

[0038] In this invention, in specific implementation, according to f V50％T The calculation method, and the temperature T of the heat source used for internal heating at a certain time point. in and the temperature T of the heat source used for external heating out The temperature of the internal heating source and / or the external heating source for the next cycle can be calculated. The temperatures of the internal and / or external heating sources can then be adjusted according to the calculated values. In the early stages of heating, if the calculated temperature of the internal heating source at a certain point exceeds the maximum value of its initial operating temperature, it indicates that it is no longer possible to continue increasing the internal heating source temperature to ensure a sustained increase in the volume of the portion of the cigarette core with a temperature greater than T0 / n. In the later stages of heating, external heating is activated or the temperature of the external heating source is increased to ensure a sustained increase in the volume of the portion of the cigarette core with a temperature greater than T0 / n. Attached Figure Description

[0039] Figure 1 This is a schematic diagram showing the relationship between the surface temperature of the internal heating element and the external heating element over time in this invention;

[0040] Figure 2 This is a schematic diagram showing the temperature at different locations of the cigarette core being heated at a certain point in time in this invention.

[0041] Figure 3This is a schematic diagram of the cigarette heating device used in Embodiment 1 of the present invention; wherein, the reference numerals are as follows: 1-inner heating element; 2-base; 3-outer heating element; 4-ultra-fine thermocouple; 5-temperature spatiotemporal distribution control system; 6-power supply;

[0042] Figure 4 This is a schematic diagram of the nicotine release rate as a function of the order of puffs, obtained from the two heating methods tested in Experimental Example 1 of the present invention.

[0043] Figure 5 This is a schematic diagram showing the change in the release amount of aroma components with the order of inhalation obtained from the two heating methods tested in Experimental Example 1 of the present invention.

[0044] Figure 6 This is a schematic diagram of the nicotine release rate as a function of the order of puffs, obtained by heating using the method of Example 2 in Experimental Example 1 of the present invention.

[0045] Figure 7 This is a schematic diagram of the change in the amount of aroma components released as a function of the order of inhalation when heated using the method of Example 2 in Experimental Example 1 of the present invention.

[0046] Figure 8 This is a schematic diagram of the nicotine release rate as a function of the order of puffs, obtained by heating using the method of Example 3 in Experimental Example 1 of the present invention during the test.

[0047] Figure 9 This is a schematic diagram of the change curve of the release of aroma components with the order of inhalation when heated using the method of Example 3 in Experimental Example 1 of the present invention. Detailed Implementation

[0048] The technical solution of the present invention will be further described below with reference to specific embodiments.

[0049] Example 1

[0050] This embodiment employs an internal and external coupling heating method to improve the smoking stability of heated cigarettes, using methods such as... Figure 3 To illustrate more clearly the method of improving the smoking stability of heated cigarettes according to the present invention, the following steps are first performed on the cigarette heating device shown. Figure 3 A brief description of the cigarette heating device shown is provided below.

[0051] The cigarette heating device used in this embodiment includes an inner heating element 1, a base 2, an outer heating element 3, an ultrafine thermocouple 4, a temperature spatiotemporal distribution control system 5, and a power supply 6. The inner heating element 1 is located inside the cigarette heating device. Both the inner heating element 1 and the outer heating element 3 are vertically fixed on the base 2. The annular area between the inner heating element 1 and the outer heating element 3 is used for inserting heated cigarettes. Heating slurry circuits are provided inside both the inner heating element 1 and the outer heating element 3, and the heating slurry lead-out wires are connected to the temperature spatiotemporal distribution control system 5. Ultrafine thermocouples 4 (with a temperature probe diameter of less than 0.2 mm) are fixed to the surfaces of both the inner heating element 1 and the outer heating element 3. The ultra-fine thermocouple 4 (mm) is connected to the temperature spatiotemporal distribution control system 5. The inner heating element 1 and the outer heating element 3 serve as heat sources to achieve internal and external heating of the heated cigarette. Based on the real-time test temperatures of the surfaces of the inner heating element 1 and the outer heating element 3 (obtained by the ultra-fine thermocouple 4 located on the surfaces of the inner heating element 1 and the outer heating element 3), and combined with the dimensions of the heated cigarette and the inner heating element 1 and the outer heating element 3, the temperature spatiotemporal distribution control system 5 can directly calculate the real-time temperature spatial distribution of the inner core of the heated cigarette. On this basis, the temperature spatiotemporal distribution control system 5 adjusts the surface temperature T of the inner heating element based on the real-time temperature spatial distribution. in and the surface temperature T of the external heating element out Then, by controlling the input voltage of the inner heating element 1 and the outer heating element 3, the temperature of different positions of the cigarette core can be adjusted in real time.

[0052] The method for improving the smoking stability of heated cigarettes in this embodiment specifically includes the following steps: A commercially available heated cigarette product (some parameters of the heated cigarette product are as follows: moisture content 10%, glycerin content 15%, filling density 0.49 g / cm³) is used. 3 Place the inner heating element 1 into the annular area between the inner heating element 1 and the outer heating element 3 of the cigarette heating device, so that the inner heating element 1 is inserted into the cigarette core of the heated cigarette product. Then turn on the switch of the inner heating element 1 to heat the cigarette core of the heated cigarette by internal heating method. Start timing at this time.

[0053] The initial operating temperature of the heat source used for internal heating is defined as T0, and the ratio of the volume of the portion of the cigarette core with a temperature greater than T0 / 2 to the total volume of the cigarette core is defined as f. V50％T f V50％T The calculation method (f) V50％T The calculation process is implemented by the temperature spatiotemporal distribution control system 5, as follows:

[0054] When T in >T out hour,

[0055] When T in <T out hour,

[0056] In the formula, T in T represents the surface temperature of the internal heating element. out T0 is the surface temperature of the external heating element, R is the initial operating temperature of the heat source used for internal heating, and r is the inner diameter of the external heating element.

[0057] During the heating process, at the start of heating, the surface temperature of the internal heating element rapidly rises to the initial maximum temperature (310℃) within 30 seconds, then remains at that temperature for a certain period (5 seconds), before rapidly cooling down (at a rate of 9.3℃ / s) to the initial operating temperature T0 (280℃). Simultaneously, the temperature spatiotemporal distribution control system 5 adjusts the temperature of the heat source used for internal heating to ensure... V50％T The increment every 30 seconds is a constant (10%), and the temperature of the heat source used for internal heating is controlled within the initial operating temperature range (200–380°C); in specific implementation, according to f V50％T The temperature increment every 30 seconds is a constant (10%). Based on the initial operating temperature 30 seconds prior, the initial operating temperature 30 seconds later is calculated. Then, according to the calculated initial operating temperature 30 seconds later, the temperature of the heat source used for internal heating is uniformly increased to the initial operating temperature 30 seconds later, completing one 30-second temperature control interval. The same method is then used for the next 30-second temperature control interval. When at a certain time point t0, the temperature of the heat source used for internal heating reaches T1, and the calculated temperature 30 seconds later exceeds the maximum value of the initial operating temperature, it indicates that increasing the temperature of the heat source used for internal heating cannot guarantee the temperature of the target temperature. V50％T The increase is constant (10%) every 30 seconds. At this time, the external heating is turned on, so that the temperature of the heat source used for external heating rises at a constant rate (at t0+30s, the temperature of the heat source used for external heating is T). 10 >100℃), and the temperature of the heat source used for internal heating is cooled down at a uniform rate, reaching 100℃ at t0+30s, and remaining constant thereafter, with the temperature between t0+30s and t0... V50％T The increase value is 10%, and then the temperature of the heat source used for external heating is continuously adjusted to make f V50％T The increment is a constant value (10%) every 30 seconds until the heat from the cigarette core is completely released. Once the cigarette is heated, it is removed from the heat supply.

[0058] Example 2

[0059] This embodiment employs an internal and external coupling heating method to improve the smoking stability of heated cigarettes. It uses the cigarette heating device from Embodiment 1 and specifically includes the following steps: A commercially available heated cigarette product (some parameters of the heated cigarette product are as follows: moisture content 15%, glycerin content 18%, propylene glycol content 5%, filling density 0.62 g / cm³) is heated. 3 Place the inner heating element 1 into the annular area between the inner heating element 1 and the outer heating element 3 of the cigarette heating device, so that the inner heating element 1 is inserted into the cigarette core of the heated cigarette product. Then turn on the switch of the inner heating element 1 to heat the cigarette core of the heated cigarette by internal heating method. Start timing at this time.

[0060] During the heating process, at the start of heating, the surface temperature of the internal heating element rapidly rises (heating rate of 9.6℃ / s) to the highest initial temperature (320℃), then remains at that temperature for a certain period (6s), and then cools down (cooling rate of 9.3℃ / s) to the initial value T0 (280℃) of the previous operating temperature. Additionally, at the start of heating, the surface temperature of the external heating element rises to 45℃ at a rate of 10℃ / s, and then remains constant. When the surface temperature of the internal heating element cools down to the initial value T0 of the previous operating temperature, the temperature spatiotemporal distribution control system 5 adjusts the temperature of the heat source used for internal heating to ensure... V50％T (f V50％T The calculation method is the same as in Example 1. The increase every 30 seconds is a fixed value (5%). In specific implementation, it is based on f V50％T The increment every 30 seconds is a constant (5%). Based on the initial operating temperature of the internal heating element surface 30 seconds prior and the temperature of the external heating element surface, the initial operating temperature of the internal heating element surface 30 seconds later is calculated. Then, according to the calculated initial operating temperature of the internal heating element surface 30 seconds later, the temperature of the heat source used for internal heating is uniformly increased to the initial operating temperature 30 seconds later, completing one 30-second temperature control interval. The same method is then used for the next 30-second temperature control interval. When at a certain time point t0, the temperature of the heat source used for internal heating reaches T1, and the calculated temperature 30 seconds later exceeds the maximum value of the initial operating temperature, it indicates that increasing the temperature of the heat source used for internal heating cannot guarantee the temperature of the internal heating element. V50％T The increase is constant (5%) every 30 seconds. During this time, the temperature of the internal heating source is kept constant at T1, while the temperature of the external heating source increases uniformly (at t0+30 seconds, the temperature of the external heating source is T). 10 <T1), f between t0+30s and t0 V50％T The increase value is 5%, and then the temperature of the heat source used for external heating is continuously adjusted to make f V50％T The increment is a constant value (5%) every 30 seconds until the heat from the cigarette core is completely released. Once the cigarette is heated, it is removed from the heat supply.

[0061] Example 3

[0062] This embodiment employs an internal and external coupling heating method to improve the smoking stability of heated cigarettes. It uses the cigarette heating device from Embodiment 1 and specifically includes the following steps: A commercially available heated cigarette product (some parameters of the heated cigarette product are as follows: moisture content 8%, glycerin content 12%, propylene glycol content 8%, filling density 0.38 g / cm³) is heated. 3 Place the inner heating element 1 into the annular area between the inner heating element 1 and the outer heating element 3 of the cigarette heating device, so that the inner heating element 1 is inserted into the cigarette core of the heated cigarette product. Then turn on the switch of the inner heating element 1 to heat the cigarette core of the heated cigarette by internal heating method. Start timing at this time.

[0063] During the heating process, at the start of heating, the surface temperature of the internal heating element rises to the initial maximum temperature (290℃) at a rate of 8.6℃ / s, then remains at that temperature for a certain period (5s), and then rapidly cools down (at a rate of 9.3℃ / s) to the initial operating temperature T0 (240℃). Simultaneously, the temperature spatiotemporal distribution control system 5 adjusts the temperature of the heat source used for internal heating to ensure... V50％T The increment every 30 seconds is a constant (20%), and the temperature of the heat source used for internal heating is controlled within the initial operating temperature range (200–380°C); in specific implementation, according to f V50％T (f V50％T The calculation method is the same as in Example 1. The increment every 30 seconds is a constant (20%), and the initial working temperature 30 seconds prior is used to calculate the initial working temperature 30 seconds later. Then, based on the calculated initial working temperature 30 seconds later, the temperature of the heat source used for internal heating is uniformly increased to the initial working temperature 30 seconds later, completing the temperature control for one 30-second interval. The same method is then used for the next 30-second interval. When at a certain time point t0, the temperature of the heat source used for internal heating reaches T1, and the calculated temperature 30 seconds later exceeds the maximum value of the initial working temperature, it indicates that it is impossible to ensure the temperature is maintained by increasing the temperature of the heat source used for internal heating. V50％T The increase is constant (20%) every 30 seconds. At this time, the external heating is turned on, so that the temperature of the heat source used for external heating rises at a constant rate (at t0+30s, the temperature of the heat source used for external heating is T). 10 >150℃), and the temperature of the heat source used for internal heating is cooled down at a uniform rate, reaching 150℃ at t0+30s, and remaining constant thereafter, with the temperature between t0+30s and t0... V50％T The increase is 20%, and then the temperature of the heat source used for external heating is continuously adjusted to make f V50％T The increment is a constant value (20%) every 30 seconds until the heat from the cigarette core is completely released. Once the cigarette is heated, it is removed from the heat supply.

[0064] Experimental Example 1

[0065] To evaluate the effect of the method for improving the smoking stability of heated cigarettes in Example 1, the heated cigarette product (the same heated cigarette product as used in Example 1) was heated according to the method in Example 1. The release rates of nicotine and flavor components (expressed as peak areas of flavor components; in this example, flavor components included pineapple ketone, nerol acetate, 5-hydroxymethylfurfural, guaiacol, menthyl isovalerate, and all other flavor components detectable by GC-MS / MS) were then tested as a function of the puff sequence. Simultaneously, the same heated cigarette product as used in Example 1 was heated using a conventional internal heating method (i.e., only internal heating was used, and the external heating element 3 was not switched on during heating), and the release rates of nicotine and flavor components were tested as a function of the puff sequence. The release rates of nicotine and flavor components obtained from the two heating methods were plotted, and the results are shown below. Figure 4-5 As shown, Figure 4 In the diagram, "internal heating" represents the nicotine release curve as a function of puff order, obtained by testing the heating method without external heating (conventional internal heating method). "Internal and external coupling" represents the nicotine release curve as a function of puff order, obtained by testing according to the method in Example 1. Figure 5 In the diagram, "internal heating" represents the curve showing the change in the release amount of aroma components with the order of inhalation, obtained by testing the heating method (conventional internal heating method) without external heating. "Internal and external coupling" represents the curve showing the change in the release amount of aroma components with the order of inhalation, obtained by testing according to the method in Example 1.

[0066] Depend on Figure 4-5 It can be seen that when external heating is not used, the amount of nicotine and flavor components released in the aerosol of heated cigarettes in each puff shows a trend of first increasing and then decreasing. This is because when internal heating is used only, the tobacco material on the outside of the cigarette cannot be fully utilized. If the internal heating temperature is increased significantly, although the temperature on the outside of the cigarette can be increased accordingly, thereby increasing the release of tobacco material on the outside of the cigarette, the negative effect is that the internal heating temperature is too high, causing the tobacco material to overheat, producing a burnt taste, and affecting the sensory quality.

[0067] The use of internal and external coupling heating method can effectively solve the problem that the nicotine and flavor components in heated cigarette aerosol gradually decrease after a certain number of puffs, and can greatly improve the stability of the release of heated cigarette aerosol per puff.

[0068] In addition, the changes in nicotine and flavor component release during heating of the heated cigarette products in Examples 2 and 3 as a function of puff sequence were tested, and the results are as follows: Figure 6-7 and Figure 8-9 As shown in the figure. The test results show that, for cigarette products with different parameters, the method of this invention can achieve good smoking stability when heating cigarettes.

[0069] Experiment Example 2

[0070] To evaluate the effect of the initial maximum heating temperature on the experimental results, the same heated cigarettes were heated according to the method of Example 1, except that the initial maximum heating temperature in the method of Example 1 was adjusted from 310°C to 230°C. During the experiment, the nicotine release and aroma component release were tested at different puff sequences.

[0071] In addition, in order to evaluate f V50％T The effect of the increment value every 30 seconds on the experimental results was investigated by heating the same heated cigarettes according to the method in Example 1, the difference being that the value of f was controlled during the heating process. V50％T The increment every 30 seconds is adjusted to f. V50％T The increase was 3% or 25% every 30 seconds. During the experiment, the release of nicotine and flavor components was tested at different puff sequences.

[0072] The method of Example 1 is defined as Method 1, and the method of adjusting the initial maximum temperature at the beginning of heating to 230°C in the method of Example 1 is defined as Method 2. V50％T Method 3 is defined as the method that increases by 3% every 30 seconds, and f V50％T Method 4 is defined as an increase of 25% every 30 seconds. In Table 1, the unit for nicotine release is mg, and the release of aroma components is expressed as the peak area of ​​the aroma component multiplied by 10... 8 The product is represented as .

[0073] Table 1. Nicotine and flavor component release rates at different puff positions obtained by different methods.

[0074]

[0075]

[0076] Table 1 shows that when heating cigarettes using Method 1, the release of nicotine and flavor components increases rapidly from the first to the second puff, exhibiting good aerosol release efficiency, and showing good release stability from the second to the eighth puff. When heating cigarettes using Method 2, due to the reduced initial maximum temperature, the overall increase in the release of nicotine and flavor components is slow (from the first to the fourth puff), indicating lower aerosol release efficiency, and a continued slow increase from the fourth to the eighth puff, resulting in poor overall release stability. When heating cigarettes using method 3, the release of nicotine and flavor components stabilizes after the third and fourth puffs, then slowly decreases with increasing puff sequence. This results in significant variations in nicotine and flavor component release throughout the heating process, leading to poor vaping stability. Similarly, when heating cigarettes using method 4, the release of nicotine and flavor components reaches higher values ​​after the third and fourth puffs, then rapidly decreases with increasing puff sequence. This also results in significant variations in nicotine and flavor component release throughout the heating process. A comparison shows that when f V50％T When the increase in value every 30 seconds is less than 5% or greater than 20%, the release of nicotine and flavor components will vary significantly with the increase in the order of puffs, resulting in poor puffing stability.

Claims

1. A method for improving the smoking stability of heated cigarettes using an internal and external coupling heating method, characterized in that, Includes the following steps: The cigarette core is heated using an internal and external coupling heating method. This internal and external coupling heating refers to a heating method where internal heating is the primary method in the initial heating stage, and external heating is the primary method in the later stage, or both internal and external heating are used simultaneously in the later stage. In the initial heating stage, the temperature of the heat source used for internal heating is first raised to the highest starting temperature, then lowered to the initial value of the initial working temperature. The temperature is then raised again to ensure that the volume of the portion of the cigarette core with a temperature greater than T0 / 2 continues to increase. During the temperature rise, the temperature of the heat source used for internal heating is controlled within the range of the initial working temperature. When it is no longer possible to continue raising the temperature of the heat source used for internal heating to ensure that the volume of the portion of the cigarette core with a temperature greater than T0 / 2 continues to increase, the later stage of heating begins. In this stage, external heating is activated or the temperature of the heat source used for external heating is raised to ensure that the volume of the portion of the cigarette core with a temperature greater than T0 / 2 continues to increase. T0 is the initial value of the initial working temperature of the heat source used for internal heating. The ratio of the volume of the portion of the cigarette core with a temperature greater than T0 / 2 to the total volume of the cigarette core is defined as... , The calculation method is as follows: when > hour, ; when < hour, ; In the formula, The temperature of the surface of the internal heating element. R is the surface temperature of the external heating element, R is the inner diameter of the external heating element, and r is the outer diameter of the internal heating element. The continuous increase in volume refers to ensuring The increment is a fixed value at regular intervals, where the regular interval is no more than 30 seconds; the fixed value is 5-20%.

2. The method for improving the smoking stability of heated cigarettes using internal and external coupling heating as described in claim 1, characterized in that, The highest starting temperature of the heat source used for internal heating is 30-80°C higher than the initial value of the heat source used for internal heating during its initial operation.

3. The method for improving the smoking stability of heated cigarettes using internal and external coupling heating as described in claim 1, characterized in that, The maximum starting temperature of the heat source used for internal heating is 230~380℃.

4. The method for improving the smoking stability of heated cigarettes using internal and external coupling heating as described in any one of claims 1-3, characterized in that, The initial operating temperature of the heat source used for internal heating is 200~380℃.

5. The method for improving the smoking stability of heated cigarettes using internal and external coupling heating as described in any one of claims 1-3, characterized in that, During the initial heating phase, the temperature of the heat source used for external heating is within the initial operating temperature range, and the initial operating temperature of the heat source used for external heating is no greater than 200℃.

6. The method for improving the smoking stability of heated cigarettes using internal and external coupling heating as described in any one of claims 1-3, characterized in that, During the later stages of heating, the temperature of the heat source used for internal heating is within the later operating temperature range, and the temperature of the heat source used for external heating is also within the later operating temperature range. The later operating temperature of the heat source used for internal heating is 100~380℃, and the later operating temperature of the heat source used for external heating is 100~380℃.

7. The method for improving the smoking stability of heated cigarettes using internal and external coupling heating as described in any one of claims 1-3, characterized in that, Once the temperature of the heat source used for internal heating reaches the highest starting temperature, maintain that temperature for 0.05~0.1 min.

8. The method for improving the smoking stability of heated cigarettes using internal and external coupling heating as described in claim 7, characterized in that, Once the temperature of the heat source used for internal heating reaches the highest initial temperature, maintain that temperature for 5-6 seconds.

9. The method for improving the smoking stability of heated cigarettes using internal and external coupling heating as described in claim 1, characterized in that, The set value is 5-10%.

10. The method for improving the smoking stability of heated cigarettes using an internal and external coupling heating method as described in claim 1, characterized in that, The set value is 10-20%.

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