Evaluation method for heating state of heated cigarette

Abstract

The invention discloses a method for evaluating the heating state of a heated cigarette. The method comprises the following steps: (1) selecting a plurality of characteristic indexes at the heating temperature T; (2) quantizing the plurality of feature indexes to obtain a quantized index # imgabs0 #; (3) constructing a multi-dimensional matrix according to the plurality of quantized indexes; (4) establishing a dimension reduction matrix for characterizing the heating state of the heating cigarette; (5) calculating a heating state evaluation index HSI of the heated cigarette; and (6) evaluating the heating state of the heated cigarette according to the evaluation index HSI. According to the method, key characteristic indexes related to the heating state in different heating stages of the heated cigarette are selected, and a heating state multi-dimensional matrix evaluation system of the heated cigarette is constructed, so that the defect that the heating state of the existing heated cigarette can only be evaluated according to the heating temperature is overcome; an objective and scientific conclusion is provided for evaluation of the heating state of the heated cigarette, and the method is simple and easy to implement, convenient to popularize and good in application prospect.

Description

Technical Field

[0001] The present invention belongs to the field of heated cigarette tobacco products and relates to a method for evaluating the heating state of heated cigarettes. Specifically, a multidimensional matrix covering multiple characteristic indicators of the heating process of heated cigarettes is constructed and used for evaluating the heating state of heated cigarettes. Background Art

[0002] As an important component of new tobacco, heated cigarettes have the characteristics of "harm reduction" because the raw materials of the tobacco core do not burn during the heating process, which significantly reduces the release of harmful and potentially harmful components in the smoke aerosol. The generation of heated cigarette smoke is closely related to its heating state (a series of processes such as drying, distillation and pyrolysis reaction). How to determine whether a heated cigarette is only in a heating but not burning state, and scientifically define the "heated cigarette" product category based on the "heating but not burning" attribute, is a key issue that the industry and even global tobacco companies urgently need to clarify.

[0003] At present, multinational tobacco groups have established their own product heating-not-burning judgment rules based on their own products; the domestic tobacco industry's heated cigarette products are rich and diverse, and there are differences with foreign heated cigarette products, so it is not appropriate to directly apply the above evaluation rules for product design. Domestic tobacco companies only use heating temperature as a key factor to determine whether it is a heated cigarette product, and the heating temperature range is wide (220-350℃), so relying solely on heating temperature still cannot systematically evaluate the heating status of heated cigarettes.

[0004] Therefore, it is necessary to systematically study the heating state of heated cigarettes, scientifically sort out the relevant evaluation indicators for the characterization of the heating state, and comprehensively explain the quantitative characterization of the heating non-combustion state of "heated cigarettes", which will help to systematically evaluate the heating state of heated cigarettes, thereby promoting the high-quality development of heated cigarettes, enhancing international discourse power, and establishing relevant standards and specifications. Summary of the invention

[0005] The present invention selects key characteristic indicators related to the heating state of heated cigarettes at different heating stages, and proposes the correlation and law between the key characteristic indicators and the heating state of heated cigarettes by constructing a "multi-dimensional matrix" evaluation system for the heating state of heated cigarettes. On the one hand, the present invention clarifies the key indicators for determining the heating state of heated cigarettes, and on the other hand, uses these selected key indicators to construct a set of evaluation mechanisms suitable for quantifying the heating state of heated cigarette products, which is used to objectively and standardly evaluate the heating state of heated cigarettes.

[0006] The present invention proposes a method for evaluating the heating state of heated cigarettes, comprising the following steps: (1) selecting multiple characteristic indicators at a heating temperature T; (2) quantifying the multiple characteristic indicators to obtain a quantitative indicator X_I^T; (3) constructing a multidimensional matrix based on the multiple quantitative indicators; (4) establishing a dimensionality reduction matrix for characterizing the heating state of heated cigarettes; (5) obtaining a heating state evaluation index HSI of heated cigarettes; and (6) evaluating the heating state of heated cigarettes according to the evaluation index HSI.

[0007] The heating state of the heated cigarette of the invention refers to: the degree of heat received by the smoke-generating matrix of the heated cigarette during the heating process.

[0008] The technical solution of the present invention is as follows:

[0009] The present invention provides a method for evaluating the heating state of a heated cigarette, which comprises the following steps:

[0010] (1) Selecting multiple characteristic indicators at heating temperature T;

[0011] (2) Quantifying the plurality of characteristic indicators to obtain a plurality of corresponding quantitative indicators

[0012] (3) Constructing a multidimensional matrix based on multiple quantitative indicators Among them, I1-I m For different quantitative indicators, T1-T m For different heating temperatures;

[0013] (4) calculating the correlation of each quantitative index in the multidimensional matrix, and determining the key quantitative index in the multidimensional matrix at the heating temperature T according to the threshold value, and establishing a dimensionality reduction matrix representing the heating state of the heated cigarette;

[0014] (5) The key quantitative indicators in the reduced dimension matrix are summed up by the weighting method to obtain the heating state evaluation index HSI of the heated cigarette, and the calculation formula is: wherein Xj is the quantification result of the key quantitative indicator, and cj is the corresponding weight of the key quantitative indicator;

[0015] (6) Establish an evaluation standard and evaluate the heating status of heated cigarettes based on the evaluation index HSI.

[0016] Preferably, in step (1), the characteristic index includes material basis, element basis, atomization basis, release basis, consumption basis and toxic and harmful basis, etc. The construction basis of the characteristic index system includes but is not limited to the transformation of tobacco core raw materials, element transformation, aerosol component release and oxygen consumption during the heating process of the heated cigarette. Based on this, the characteristic indexes selected for evaluating the heating state of the heated cigarette include material basis, element basis, atomization basis, release basis, consumption basis and toxic and harmful basis.

[0017] Preferably, in step (2), the quantification method is: calculating the percentage of the characteristic index value at the heating temperature T and the corresponding characteristic index value in the fully heated state, that is, the quantitative index of the characteristic index at the heating temperature T. The fully heated state refers to the characteristic index expression presented when the smoking matrix of the heated cigarette is at the ignition point temperature.

[0018] In the present invention, the substance-based quantitative index refers to the degree of thermal conversion of the smoking substrate at the heating temperature, that is, the thermal conversion rate of the smoking substrate at the heating temperature. Thermal conversion rate under fully heated state The ratio is calculated as:

[0019] The above W0 is the initial mass of the smoking substrate / g, M0 is the initial moisture content of the smoking substrate / %, W0(1-M0) is the initial dry weight of the smoking substrate / g, W T M is the mass of the smoking substrate after heating at the temperature / g, T is the moisture content of the smoking matrix after heating / %, W T (1-M T ) is the dry weight of the smoking substrate after heating / g, is the conversion rate of the smoking substrate at the temperature, It is the conversion rate under the fully heated state, the same below.

[0020] The element-based quantitative index refers to the degree of conversion of the smoke matrix elements at the heating temperature, that is, the conversion rate of the smoke matrix elements at the heating temperature. The thermal conversion rate of the element under the fully heated state The ratio is calculated as: The element base includes but is not limited to C, H, O, N and other elements. T They are the element contents of the smoking matrix before and after heating, %.

[0021] The atomization-based quantitative index refers to the degree of thermal conversion of the key components in the smoke-generating matrix aerosol at the heating temperature, that is, the conversion rate of the key components in the smoke-generating matrix aerosol at the heating temperature. The conversion rate of components under complete heating The ratio is calculated as: The key components of the aerosol include but are not limited to nicotine, smoke generating agent, water, etc. ACM,0 , C ACM,T are the component contents in the aerosol before and after the smoking matrix is ​​heated, %.

[0022] The quantitative index of the release substance refers to the degree of thermal conversion of the target release substance at the heating temperature, that is, the conversion rate of the target release substance at the heating temperature. The thermal conversion rate of the element under the fully heated state The ratio is calculated as: The released substances include but are not limited to CO, CO2, NO, NO2, 1,3-butadiene and other characteristic components, C Re,0 , C Re,T They are the contents of released substances before and after heating, %.

[0023] The consumption base quantitative index refers to the degree of conversion of the smoking matrix to the consumption components at the heating temperature, that is, the conversion rate of the consumption components at the heating temperature. The conversion rate of the consumed components under the fully heated state The ratio is calculated as: The consumable components include but are not limited to nicotine, smoke generating agent, water, etc. ACM,0 , C ACM,T They are the component contents of the smoking matrix before and after heating, %.

[0024] The quantitative index of harmful or potentially harmful substances refers to the degree of thermal conversion of the target release at the heating temperature, that is, the conversion rate of the target release at the heating temperature. The thermal conversion rate of the element under the fully heated state The ratio is calculated as: The harmful or potentially harmful substances include but are not limited to 1,3-butadiene, isoprene, acrylonitrile, benzene, toluene and other characteristic components. HPHC,0 , C HPHC,T They are the contents of harmful or potentially harmful substances before and after heating, %.

[0025] Preferably, in step (4), the threshold setting range is not less than 0.7, and the quantitative indicators with correlations lower than the threshold are retained as key quantitative indicators.

[0026] Preferably, in step (5), the weight range of the substance-based index is 0.16-0.8, the weight range of the element-based index is 0.01-0.2, the weight range of the atomization-based index is 0.16-0.8, the weight range of the release-based index is 0.01-0.2, the weight range of the consumption-based index is 0.1-0.4, the weight range of the toxic and harmful base is 0.01-0.2, and the sum of the weights of all indicators is 1.

[0027] Preferably, the evaluation criteria in step (6) are:

[0028] HSI≤0.25, first-level heating state;

[0029] 0.25<HSI≤0.55, secondary heating state;

[0030] 0.55<HSI≤0.65, third-level heating state;

[0031] HSI>0.65, four-level heating state. As the heating progresses, the more sufficient the heating is, the higher the heating state level is. Among them, the first-level heating state is the initial heating state, the second-level heating state is the medium heating state, the third-level heating state is the relatively sufficient heating state, and the fourth-level heating state is the sufficient heating state.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. The present invention selects key characteristic indicators related to the heating state of heated cigarettes at different heating stages, and proposes the correlation and rules between key characteristic indicators and the heating state of heated cigarettes by constructing a "multi-dimensional matrix" evaluation system for the heating state of heated cigarettes. On the one hand, the present invention clarifies the key indicators for determining the heating state of heated cigarettes, and on the other hand, uses these selected key indicators to construct a set of evaluation mechanisms suitable for quantifying the heating state of heated cigarette products, which is used to objectively and standardly evaluate the heating state of heated cigarettes.

[0034] 2. The present invention makes up for the deficiency that the existing heated cigarettes can only evaluate the heating state based on the heating temperature, and provides an objective and scientific conclusion for the evaluation of the heating state of heated cigarettes. The method of the present invention is simple and easy to implement, easy to promote, and has a good application prospect. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0037] The heating state evaluation method of the heated cigarette in this embodiment is:

[0038] (1) Select six characteristic indicators at the heating temperature T: substance basis, element basis, atomization basis, release basis, consumption basis and toxic and harmful basis;

[0039] (2) quantifying the plurality of characteristic indices to obtain six corresponding quantitative indices;

[0040] The substance-based quantitative index refers to the degree of thermal conversion of the smoke-generating substrate at the heating temperature, that is, the thermal conversion rate of the smoke-generating substrate at the heating temperature. Thermal conversion rate under fully heated state The ratio is calculated as:

[0041] The above W0 is the initial mass of the smoking substrate / g, M0 is the initial moisture content of the smoking substrate / %, W0(1-M0) is the initial dry weight of the smoking substrate / g, W T M is the mass of the smoking substrate after heating at the temperature / g, T is the moisture content of the smoking matrix after heating / %, W T (1-M T ) is the dry weight of the smoking substrate after heating / g, is the conversion rate of the smoking substrate at the temperature, It is the conversion rate under the fully heated state, the same below.

[0042] The element-based quantitative index refers to the degree of conversion of the smoke matrix elements at the heating temperature, that is, the conversion rate of the smoke matrix elements at the heating temperature. The thermal conversion rate of the element under the fully heated state The ratio is calculated as: The element base includes but is not limited to C, H, O, N and other elements. T They are the element contents of the smoking matrix before and after heating, %.

[0043] The atomization-based quantitative index refers to the degree of thermal conversion of the key components in the smoke-generating matrix aerosol at the heating temperature, that is, the conversion rate of the key components in the smoke-generating matrix aerosol at the heating temperature. The conversion rate of components under complete heating The ratio is calculated as: The key components of the aerosol include but are not limited to nicotine, smoke generating agent, water, etc. ACM,0 , C ACM,T are the component contents in the aerosol before and after the smoking matrix is ​​heated, %.

[0044] The quantitative index of the release substance refers to the degree of thermal conversion of the target release substance at the heating temperature, that is, the conversion rate of the target release substance at the heating temperature. The thermal conversion rate of the element under the fully heated state The ratio is calculated as: The released substances include but are not limited to CO, CO2, NO, NO2, 1,3-butadiene and other characteristic components, C Re,0 , C Re,T They are the contents of released substances before and after heating, %.

[0045] The consumption base quantitative index refers to the degree of conversion of the smoking matrix to the consumption components at the heating temperature, that is, the conversion rate of the consumption components at the heating temperature. The conversion rate of the consumed components under the fully heated state The ratio is calculated as: The consumable components include but are not limited to nicotine, smoke generating agent, water, etc. ACM,0 , C ACM,T They are the component contents of the smoking matrix before and after heating, %.

[0046] The quantitative index of harmful or potentially harmful substances refers to the degree of thermal conversion of the target release at the heating temperature, that is, the conversion rate of the target release at the heating temperature. The thermal conversion rate of the element under the fully heated state The ratio is calculated as: The harmful or potentially harmful substances include but are not limited to 1,3-butadiene, isoprene, acrylonitrile, benzene, toluene and other characteristic components. HPHC,0 , C HPHC,T They are the contents of harmful or potentially harmful substances before and after heating, %.

[0047] (3) constructing a multidimensional matrix based on a plurality of the quantitative indicators;

[0048] The uniform heating state of the core material of 1# heated cigarette at 350℃ was marked as the fully heated state. The “multi-dimensional matrix” evaluation system of the heating state of heated cigarettes was constructed to obtain the thermal conversion degree of 20 evaluation indicators in six dimensions, including sample substance basis, element basis, atomization basis, release basis, consumption basis, and HPHC (toxic and harmful basis) at six temperatures. The specific results are shown in Table 1.

[0049] (4) calculating the correlation of each quantitative index in the multidimensional matrix, and determining the key quantitative index in the multidimensional matrix at the heating temperature T according to the threshold value of 0.8, and establishing a dimensionality reduction matrix representing the heating state of the heated cigarette;

[0050] The correlation analysis of each indicator is shown in Table 2. The correlation threshold is set to 0.8, that is, after correlation analysis, the key quantitative indicators of the heating state of the sample are selected as material basis, element basis (C element), and toxic and harmful basis (1,3-butadiene).

[0051] (5) The key quantitative indicators in the reduced dimension matrix are summed up by the weighting method to obtain the heating state evaluation index HSI of the heated cigarette, and the calculation formula is: wherein Xj is the quantification result of the key quantitative indicator, and cj is the corresponding weight of the key quantitative indicator;

[0052] The weights corresponding to the above-mentioned key quantitative indicators of substance base, element base (C element), and toxic and harmful base (1,3-butadiene) are 0.7, 0.15, and 0.15, respectively. Thus, the heating state evaluation index HSI of the sample at each heating temperature can be obtained. The results are shown in Table 3. The heated cigarettes at different heating temperatures are evaluated according to the evaluation index HSI.

[0053] (6) Establish an evaluation standard and evaluate the heating status of heated cigarettes based on the evaluation index HSI.

[0054] The evaluation criteria are:

[0055] HSI≤0.25, first-level heating state;

[0056] 0.25<HSI≤0.55, secondary heating state;

[0057] 0.55<HSI≤0.65, third-level heating state;

[0058] HSI>0.65, fourth-level heating state.

[0059] The heated cigarettes at different heating temperatures were evaluated according to the evaluation index HIS, see Table 3.

[0060] Table 1 (Part 1) Multidimensional matrix index values ​​of thermal conversion degree of samples at different heating temperatures

[0061]

[0062] Table 1 (Part II) Multidimensional matrix index values ​​of thermal conversion degree of samples at different heating temperatures

[0063]

[0064] Table 2 (Part I) Multidimensional matrix index numerical correlation analysis

[0065]

[0066] Table 2 (Part II) Multidimensional matrix index numerical correlation analysis

[0067]

[0068]

[0069] Table 3 Evaluation results of sample heating status

[0070]

Claims

1. A method for evaluating the heating state of a heated cigarette, characterized in that: It includes the following steps: (1) Selecting multiple characteristic indicators at heating temperature T; (2) Quantifying the plurality of characteristic indicators to obtain a plurality of corresponding quantitative indicators (3) Constructing a multidimensional matrix based on multiple quantitative indicators Among them, I1-I m For different quantitative indicators, T1-T m For different heating temperatures; (4) calculating the correlation of each quantitative index in the multidimensional matrix, and determining the key quantitative index in the multidimensional matrix at the heating temperature T according to the threshold value, and establishing a dimensionality reduction matrix representing the heating state of the heated cigarette; (5) The key quantitative indicators in the dimension reduction matrix are summed up by using the weighting method to obtain the heating state evaluation index HSI of the heated cigarette, which is calculated as follows: Where X j is the quantitative result of key quantitative indicators, c j Corresponding weights for key quantitative indicators; (6) Establish an evaluation standard and evaluate the heating status of heated cigarettes based on the evaluation index HSI.

2. The evaluation method according to claim 1, characterized in that: In step (1), the characteristic indicators include substance basis, element basis, atomization basis, release basis, consumption basis and toxic and harmful basis.

3. The evaluation method according to claim 1, characterized in that: In step (2), the quantification method is: calculate the percentage of the characteristic index value at the heating temperature T and the corresponding characteristic index value in the fully heated state, that is, the quantification index of the characteristic index at the heating temperature T.

4. The evaluation method according to claim 1, characterized in that: In step (4), the threshold setting range is not less than 0.7, and the quantitative indicators with correlations lower than the threshold are retained as key quantitative indicators.

5. The evaluation method according to claim 1, characterized in that: The weight range of the substance-based index in step (5) is 0.16-0.8, the weight range of the element-based index is 0.01-0.2, the weight range of the atomization-based index is 0.16-0.8, the weight range of the release-based index is 0.01-0.2, the weight range of the consumption-based index is 0.1-0.4, the weight range of the toxic and harmful base is 0.01-0.2, and the sum of the weights of all indicators is 1.

6. The evaluation method according to claim 1, characterized in that: The evaluation criteria in step (6) are: HSI≤0.25, first-level heating state; 0.25<HSI≤0.55, secondary heating state; 0.55<HSI≤0.65, third-level heating state; HSI>0.65, fourth-level heating state.

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