Evaluation method for peculiar smell of cigarette material and application of evaluation method

Abstract

The invention relates to a cigarette material peculiar smell evaluation method and application thereof.The evaluation method comprises the steps that a cigarette material normal sample free of peculiar smell is taken as a sample A, a sample to be detected is taken as a non-sample A, the sample A and the non-sample A are heated, then peculiar smell evaluation is conducted on the heated sample A and the heated non-sample A according to an A-non-A detection method, and the peculiar smell of the cigarette material is evaluated. And calculating a kappa value according to the test data, and carrying out peculiar smell judgment on the to-be-detected sample. On the basis of an A-non-A test method, whether the peculiar smell can be perceived by sense organs and is obviously higher than the random recognition level or not is judged by comparing the recognition capability of an evaluator on the smell of a control sample (sample A) and a to-be-detected sample (non-sample A) of the cigarette material and utilizing a Kappa value method to count, analyze and evaluate data, so that the peculiar smell of the cigarette material can be effectively judged; the method is stable and reliable in result, is more visual, and has extremely high operability and application value.

Description

Technical Field

[0001] The present invention relates to the technical field of sensory evaluation, and in particular to a method for evaluating the odor of tobacco materials and application thereof. Background Art

[0002] Off-flavor tobacco materials are characterized by an unpleasant, irritating, or even harmful odor after drying. Causes of off-flavor include residual ink, inherent odors, storage history, and packaging methods. Currently, YC / T 207-2014, "Determination of Residual Solvents in Cigarette Paper - Headspace Gas Chromatography," is generally used to determine residual solvents in tobacco paper. The total amount of residual solvents is used to determine compliance. Adhesive quality control is achieved through GBT 27934.3-2011, "Control and Test Methods for Laminating Printed Paper - Part 3: Water-Based Adhesives, i.e., Dry-Coating Lamination," and YQ 5-2019, "Safety and Hygiene Requirements for Tobacco Adhesives." However, some products may appear qualified according to the standard but actually contain an off-flavor. This can lead to significant deviations or omissions in tobacco material odor detection results, impacting the stability of cigarette quality.

[0003] However, current technology cannot accurately determine the odor of tobacco materials. Therefore, there is an urgent need to develop a universal and targeted method for evaluating the odor of tobacco materials. Summary of the Invention

[0004] To address the above technical issues, the present invention provides a method for evaluating the odor of tobacco materials and its application. By objectively statistically verifying sensory results, it provides a sensitive and reliable solution for detecting odor in tobacco materials, which is of great significance to tobacco companies in the quality control of cigarette production.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present invention provides a method for evaluating the odor of a smoking material, the method comprising:

[0007] Take a normal sample of tobacco material without odor as sample A, and take the sample to be tested as non-sample A. Heat the sample A and the non-sample A, and then evaluate the odor of the heated sample A and the non-sample A according to the A-non-A test method. Calculate the kappa value based on the test data and judge the odor of the sample to be tested.

[0008] The present invention amplifies the odor of tobacco materials through heat treatment, making them easier to analyze and identify. At the same time, based on the A-non-A test method, by comparing the evaluators' ability to identify the odor of a control sample (A sample) of tobacco materials and the sample to be tested (non-A sample), and using the kappa value method to statistically analyze and evaluate the data, it is determined whether the odor is perceptible by the senses and is significantly higher than the random recognition level. The sensory results are verified through objective statistics, providing a solution for the detection of odors in tobacco materials that is both sensitive and reliable, and is suitable for large-scale promotion and application.

[0009] Preferably, a sufficient number of normal samples with no odor and qualified quality are screened out from batches of materials with stable supply and continuous production, placed in a sample container, and stored in a sealed manner in the dark at a temperature of (23±1)°C and a humidity of (50±2)% as sample A.

[0010] Preferably, the normal samples should be replaced on schedule, and the validity period should not exceed half a year.

[0011] Preferably, for samples to be tested of the same specification and supplied by multiple manufacturers, only one sample A is established.

[0012] Preferably, the tobacco material comprises any one of a packaging box, wrapping paper, tipping paper, liner paper or adhesive, or a combination of at least two of them.

[0013] Preferably, when the tobacco material is box wrapping paper, the number of samples in each non-A sample is not less than 200 sheets; when the tobacco material is strip wrapping paper, the number of samples in each non-A sample is not less than 100 sheets; when the tobacco material is special-shaped packaging boxes, the number of samples in each non-A sample is not less than 100; when the tobacco material is tipping paper or lining paper, the sample in each non-A sample is a paper stack with a length of 350-450 mm and a thickness of not less than 5 mm; when the tobacco material is an adhesive, the mass of the sample in each non-A sample is not less than 1 kg.

[0014] Preferably, the corresponding samples after arrival are taken as the samples to be tested, placed in sample containers, and stored in a sealed manner in the dark at a temperature of (23±1)°C and a humidity of (50±2)%, as non-sample A.

[0015] Preferably, the heating treatment also includes a preliminary evaluation of sample A and non-sample A, and the preliminary evaluation includes: the evaluators smell sample A and non-sample A respectively. When the evaluators unanimously agree that there is no difference in the smell of sample A and non-sample A, or the smell of non-sample A is weaker than that of sample A, the sample to be tested is determined to have no odor. Otherwise, subsequent heating treatment and odor evaluation steps are carried out.

[0016] Preferably, the number of evaluators for the initial evaluation is 2 or more (for example, 2, 3, 4, 5, etc.).

[0017] Preferably, the heating treatment comprises: placing sample A and non-sample A in sealed containers respectively for heating treatment.

[0018] Preferably, the sealed container comprises a glass bottle and / or an aluminum foil bag.

[0019] Preferably, the sealed container should be clean, dry and odorless. The volume of the container is selected according to the sample to be tested. For example, a brown glass bottle with a volume of 250 mL and a diameter of 3 cm or a 26×35 cm thickened self-sealing aluminum foil bag can be selected.

[0020] Preferably, the operation requirements for moving each smoking material into the sealed container are as follows:

[0021] ① Box wrapping paper: Take 1-3 sheets of sample, roll them into a cylinder (with the printed side facing inward) and place them in the sample container;

[0022] ② Strips of wrapping paper: Take 1-3 samples, fold them in half lengthwise (with the printed side facing outward), roll them into a cylinder, and place them in the sample container;

[0023] ③ Tipping paper and lining paper: Cut the entire width and length to 40-60cm, loosen and place in the sample container;

[0024] ④ Special-shaped packaging box: Take a whole box, open it and place it in a self-sealing aluminum foil bag, then seal it immediately;

[0025] ⑤ Adhesive: Weigh 8-12g of sample and place it in a sample container.

[0026] Preferably, the temperature of the heating treatment is 35-45°C (for example, 35°C, 38°C, 40°C, 42°C, 45°C, etc.), and the time of the heating treatment is 1.5-4h (for example, 1.5h, 2h, 2.5h, 3h, 3.5h, 4h, etc.).

[0027] Preferably, the heating treatment comprises: mixing sample A and non-sample A with molecular sieve loaded with copper oxide respectively, and heating them together.

[0028] Preferably, the loading amount of copper oxide on the copper oxide-loaded molecular sieve is 10-20 mg / g (for example, 10 mg / g, 12 mg / g, 15 mg / g, 18 mg / g, 20 mg / g, etc.).

[0029] Preferably, the amount of the copper oxide-loaded molecular sieve is 2-5 g (eg, 2 g, 3 g, 4 g, 5 g, etc.).

[0030] The present invention can amplify the odor difference between A-like and non-A-like by introducing molecular sieve particles loaded with copper oxide, thereby further improving the accuracy of sensory detection.

[0031] Preferably, the odor evaluation includes:

[0032] (1) Sample A is provided to the evaluator, who sniffs it repeatedly until he or she can accurately identify it;

[0033] (2) Each time, a sample A or a non-sample A is randomly given, and the evaluator independently smells and identifies whether the sample is sample A or non-sample A, and obtains the test data.

[0034] Preferably, in step (2), 8-16 samples (for example, 8, 10, 12, 14, or 16) of equal number of A samples and non-A samples are prepared for each evaluator.

[0035] Preferably, the number of evaluators for the odor evaluation is 7-20 (for example, 7, 9, 12, 15, 20, etc.), preferably 7-9.

[0036] Preferably, the sniffing requirements include: when sniffing, the evaluator should shake the sample container, open the sample container, put the nose close to the sample container, at a distance of about 10-15 cm, and slowly inhale the gas 2-3 times for sniffing; after inhalation, the sample container should be sealed in time; if repeated evaluation is required, the interval time should be no less than 1 minute.

[0037] The calculation formula of the Kappa value is as follows:

[0038]

[0039] Where K is the Kappa value, P o To observe consistency, P e For expected consistency, n 11 is the total number of sample A correctly identified, n 22 is the total number of non-A samples correctly identified, n 12 is the total number of sample A identified as non-sample A, n 21 is the total number of non-A samples identified as A samples, and n is the total number of A samples and non-A samples.

[0040] Preferably, in the odor determination, the larger the Kappa value is, the greater the difference between the test sample and the normal sample is, and the greater the odor of the test sample is.

[0041] Preferably, the odor determination criteria are:

[0042] When K≤0.20, there is no difference between the test sample and the normal sample, and the test sample is judged to have no odor and qualified;

[0043] When 0.21≤K≤0.40, there is a slight difference between the sample to be tested and the normal sample, and the sample to be tested is judged to have a slight odor and is of qualified quality;

[0044] When 0.41≤K≤0.60, there is a certain difference between the sample to be tested and the normal sample, and the sample to be tested is judged to have a general odor and is unqualified;

[0045] When 0.61≤K≤0.80, there is an obvious difference between the sample to be tested and the normal sample, and the sample to be tested is judged to have a strong odor and is unqualified;

[0046] When 0.81≤K≤1.00, there is a very significant difference between the test sample and the normal sample, and the test sample is judged to have a serious odor and unqualified quality.

[0047] In a second aspect, the present invention provides an application of the method for evaluating the odor of smoking materials according to the first aspect in the production, transportation or storage of smoking materials.

[0048] Compared with the prior art, the present invention has at least the following beneficial effects:

[0049] The present invention adopts the A-non-A test method, which compares the evaluators' ability to identify the odor of the control sample (A sample) of tobacco materials and the sample to be tested (non-A sample), and uses the Kappa value method to statistically analyze the evaluation data to determine whether the odor can be perceived by the senses. This method has many advantages such as a double verification mechanism, strong anti-interference ability, interpretable results, high sensitivity, and risk stratification management through sensory-statistical collaborative design. It improves the robustness of the results while ensuring the sensitivity of the detection. It is especially suitable for scenarios such as tobacco materials with low odor thresholds and high quality requirements. Its technical advantages are not only reflected in scientific rigor, combining quality control and risk management, but also through its low cost and easy implementation, it has built a full-process odor control system for enterprises from laboratory to production line. DETAILED DESCRIPTION

[0050] For the convenience of understanding the present invention, the present invention is given below with examples. It should be understood by those skilled in the art that the examples are only for the purpose of helping to understand the present invention and should not be regarded as specific limitations of the present invention.

[0051] Example 1

[0052] This embodiment provides a method for evaluating the odor of tobacco materials, using tipping paper samples from two tobacco material manufacturers, A (normal) and B (problematic), as research objects, including the following steps:

[0053] (1) Establishment of control sample (Sample A): Based on the paper stack size requirements of 400 mm in length and not less than 5 mm in thickness, select the odorless and qualified tipping paper samples from Manufacturer A as the control sample, which is regarded as Sample A. The samples are placed in self-sealing aluminum foil bags and stored in a sealed manner at a temperature of (23 ± 1) °C and a humidity of (50 ± 2)% in the dark.

[0054] (2) Extraction of samples to be tested (non-sample A): Samples of the corresponding products received from manufacturer B were collected as samples to be tested and regarded as non-sample A. The samples were placed in self-sealing aluminum foil bags and stored in a sealed manner at a temperature of (23±1)°C and a humidity of (50±2)% in the dark.

[0055] (3) Sample preparation: Cut the sample into a full width and 50 cm in length. Transfer the sample from steps (1) and (2) and place it in a brown glass bottle. Seal it to obtain the sample.

[0056] (4) Preliminary evaluation: The sample prepared in step (3) is transferred and placed in the evaluation room without pretreatment. It is placed at 25℃ for 2 hours. When smelling, the evaluator should shake the sample container, open the sample container, put the nose close to the sample container at a distance of about 10 cm, and slowly inhale the gas twice to smell it; after inhalation, the sample container should be sealed in time; if repeated evaluation is required, the interval time should be no less than 1 minute, and the smell difference between sample A and non-sample A should be compared to determine whether there is an odor difference between sample A and non-sample A; after evaluation and judgment by two evaluators, it is unanimously agreed that the odor difference is obvious and re-evaluation is required;

[0057] (5) Heating treatment: Place the sample prepared in step (3) in an oven at 40°C for 2 h, then remove it and transfer it to an evaluation room for later use.

[0058] (6) Re-evaluation: Evaluate according to the A-non-A test method, and use the Kappa value method to statistically analyze the test data and make judgments;

[0059] Nine experienced olfactory experts were selected as re-evaluators. A sample of the control sample (Sample A) was provided to each evaluator, who then sniffed it repeatedly until they could accurately identify it. After the evaluators learned to identify the control sample A, a total of 70 samples of Sample A and non-Sample A were prepared (34 Sample A and 36 non-Sample A). These samples were assigned three-digit codes and randomly arranged to prevent the evaluators from knowing them.

[0060] After the test begins, a sample is randomly given in 10 rounds. The evaluators are required to independently identify the sample according to the sniffing requirements and indicate whether it is Sample A or Non-Sample A. The number of Sample A and Non-Sample A given to all evaluators is equal, and a record is kept (i.e., each evaluator is randomly given 5 Sample A and Non-Sample A);

[0061] The Kappa value method was used to perform statistical analysis on the test data, and the Kappa value (K) was calculated according to the following formula:

[0062]

[0063] Where K is the Kappa value, P o To observe consistency, P eFor expected consistency, n 11 is the total number of sample A correctly identified, n 22 is the total number of non-A samples correctly identified, n 12 is the total number of sample A identified as non-sample A, n 21 is the total number of non-A samples identified as A samples, and n is the total number of A samples and non-A samples;

[0064] Then the odor of the sample to be tested is judged based on the Kappa value (K), and the judgment criteria are as follows.

[0065]

[0066]

[0067] Example 2

[0068] This embodiment provides a method for evaluating the odor of tobacco materials. The only difference between this embodiment and embodiment 1 is that the temperature of the heating treatment in step (5) is 35° C. and the time is 4 hours. Other details refer to embodiment 1.

[0069] Example 3

[0070] This embodiment provides a method for evaluating the odor of tobacco materials. The only difference between this embodiment and embodiment 1 is that the temperature of the heating treatment in step (5) is 45° C. and the time is 1.5 h. For other matters, refer to embodiment 1.

[0071] Example 4

[0072] This embodiment provides a method for evaluating the odor of tobacco materials. The only difference between this method and Example 1 is that, in step (5), 3 g of molecular sieve particles loaded with trace copper oxide (Jiangxi Hanming Environmental Protection Technology Co., Ltd., model 5 mm, copper oxide loading 15 mg / g) are added to each brown glass bottle before the heat treatment. Other procedures are similar to those in Example 1.

[0073] Example 5

[0074] This embodiment provides a method for evaluating the odor of tobacco materials. The only difference between this method and Example 1 is that the brown glass bottle is replaced with a self-sealing aluminum foil bag in step (3). Other steps refer to Example 1.

[0075] Comparative Example 1

[0076] This comparative example provides a method for evaluating the odor of tobacco materials. The difference between this method and Example 1 is that the heating treatment in step (5) is not performed, and a re-evaluation is performed directly after the initial evaluation. For other matters, refer to Example 1.

[0077] The test was repeated three times according to the evaluation methods provided in Examples 1-5 and Comparative Example 1, and the calculated Kappa values ​​and odor determinations are shown in Table 1.

[0078] Table 1

[0079] Grouping K RSD (%) Judgment results Example 1 0.657 3.413 The sample to be tested has a strong odor and is of unqualified quality. Example 2 0.648 4.078 The sample to be tested has a strong odor and is of unqualified quality. Example 3 0.627 6.762 The sample to be tested has a strong odor and is of unqualified quality. Example 4 0.785 2.139 The sample to be tested has a strong odor and is of unqualified quality. Example 5 0.643 7.390 The sample to be tested has a strong odor and is of unqualified quality. Comparative Example 1 0.611 19.973 The sample to be tested has a strong odor and is of unqualified quality.

[0080] As can be seen from Examples 1-5, the present invention amplifies the odor of tobacco materials through heat treatment, making them easier to analyze and identify. Simultaneously, based on the A-non-A test method, objective statistical verification of sensory results achieves precise and accurate determination of the odor of tobacco materials. A comparison of Example 1 and Example 4 shows that the introduction of molecular sieve particles loaded with trace amounts of copper oxide during heat treatment further amplifies the odor of tobacco materials, improving the precision of sensory evaluation. A comparison of Example 1 and Example 5 shows that using a glass bottle as a sample container is superior to a self-sealing aluminum foil bag. This is presumably because the aluminum foil bag has a larger opening, which results in a loss of odor during sniffing, affecting the evaluator's judgment. A comparison of Example 1 and Comparative Example 1 shows that when no heat treatment is performed, the tobacco material has a smaller odor, making it difficult to determine, thereby reducing the precision of the sensory evaluation.

[0081] Example 6

[0082] This embodiment provides a method for evaluating the odor of tobacco materials. The only difference between this embodiment and embodiment 1 is that the tipping paper samples of two tobacco material production companies, A (normal) and C (suspected), are used as research objects. In step (2), the sample to be tested is extracted from sample C (suspected) and is considered to be non-sample A. Other procedures refer to embodiment 1.

[0083] Test results: K is 0.314, RSD is 3.097 (n=3), and the test sample is judged to have a slight odor and is of qualified quality, but needs improvement.

[0084] Example 7

[0085] This embodiment provides a method for evaluating the odor of tobacco materials. The difference between this embodiment and embodiment 1 is that only the tipping paper samples of tobacco material production enterprise A (normal) are used as the research objects. In step (2), the sample to be tested is extracted from A (normal) and is regarded as a non-A sample. The initial evaluation of step (4) is omitted. For other procedures, refer to embodiment 1.

[0086] Test results: K is 0.174, RSD is 3.035 (n=3), and the test sample is judged to have no odor and is of qualified quality.

[0087] Example 8

[0088] This embodiment provides a method for evaluating the odor of tobacco materials. The only difference between this embodiment and embodiment 1 is that the box packaging paper samples of two tobacco material production enterprises, D (normal) and E (problem), are used as research objects. In step (1), a control sample is screened from D (normal) and regarded as sample A. In step (2), a sample to be tested is extracted from E (problem) and regarded as non-sample A. In step (3), the sample is prepared as follows: two samples are taken, rolled into a cylindrical shape (with the printed surface facing inward), placed in a brown glass bottle, and sealed to obtain the sample. Other procedures refer to embodiment 1.

[0089] Test results: K is 0.571, RSD is 3.517 (n=3), and the test sample is judged to have a general odor and is of unqualified quality.

[0090] In summary, the evaluation method provided by the present invention can accurately determine the odors of various tobacco materials, and provides a solution for the detection of odors of tobacco materials that is both sensitive and reliable.

[0091] The applicant declares that the above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention fall within the scope of protection and disclosure of the present invention.

Claims

1. A method for evaluating the odor of a tobacco material, characterized in that: The evaluation method includes: Take a normal sample of tobacco material without odor as sample A, and take the sample to be tested as non-sample A. Heat the sample A and the non-sample A, and then evaluate the odor of the heated sample A and the non-sample A according to the A-non-A test method. Calculate the kappa value based on the test data and judge the odor of the sample to be tested.

2. The evaluation method according to claim 1, wherein: The tobacco material comprises any one of a packaging box, wrapping paper, tipping paper, lining paper or adhesive, or a combination of at least two of them.

3. The evaluation method according to claim 1 or 2, characterized in that Before the heating treatment, the sample A and the non-sample A are subjected to a preliminary evaluation, wherein the preliminary evaluation comprises: the evaluators smell the sample A and the non-sample A respectively. If the evaluators unanimously agree that there is no difference in the odor between the sample A and the non-sample A, or that the odor of the non-sample A is weaker than that of the sample A, the sample to be tested is determined to have no odor. Otherwise, the subsequent heating treatment and odor evaluation steps are performed; Preferably, the number of evaluators for the initial evaluation is 2 or more.

4. The evaluation method according to any one of claims 1 to 3, characterized in that: The heating treatment comprises: placing sample A and non-sample A in sealed containers for heating treatment; Preferably, the sealed container comprises a glass bottle and / or an aluminum foil bag; Preferably, the heating treatment comprises: mixing sample A and non-sample A with molecular sieve loaded with copper oxide, and heating them together; Preferably, the loading amount of copper oxide on the copper oxide-loaded molecular sieve is 10-20 mg / g; Preferably, the amount of the copper oxide-loaded molecular sieve used is 2-5 g.

5. The evaluation method according to any one of claims 1 to 4, characterized in that: The temperature of the heating treatment is 35-45° C., and the time of the heating treatment is 1.5-4 hours.

6. The evaluation method according to any one of claims 1 to 5, characterized in that: The odor evaluation includes: (1) Sample A is provided to the evaluator, who sniffs it repeatedly until he or she can accurately identify it; (2) Each time, a sample A or a non-sample A is randomly given, and the evaluator independently smells and identifies whether the sample is sample A or non-sample A, and obtains the test data; Preferably, the number of evaluators for the odor evaluation is 7-20, preferably 7-9.

7. The evaluation method according to claim 6, wherein: The calculation formula of the Kappa value is as follows: Where K is the Kappa value, P o To observe consistency, P e For expected consistency, n 11 is the total number of sample A correctly identified, n 22 is the total number of non-A samples correctly identified, n 12 is the total number of sample A identified as non-sample A, n 21 is the total number of non-A samples identified as A samples, and n is the total number of A samples and non-A samples.

8. The evaluation method according to any one of claims 1 to 7, characterized in that: In the odor determination, the larger the Kappa value, the greater the difference between the test sample and the normal sample, and the greater the odor of the test sample.

9. The evaluation method according to claim 8, characterized in that The criteria for judging the odor are: When K≤0.20, there is no difference between the test sample and the normal sample, and the test sample is judged to have no odor and qualified; When 0.21≤K≤0.40, there is a slight difference between the sample to be tested and the normal sample, and the sample to be tested is judged to have a slight odor and is of qualified quality; When 0.41≤K≤0.60, there is a certain difference between the sample to be tested and the normal sample, and the sample to be tested is judged to have a general odor and is unqualified; When 0.61≤K≤0.80, there is an obvious difference between the sample to be tested and the normal sample, and the sample to be tested is judged to have a strong odor and is unqualified; When 0.81≤K≤1.00, there is a very significant difference between the test sample and the normal sample, and the test sample is judged to have a serious odor and unqualified quality.

10. Use of the method for evaluating the odor of smoking materials according to any one of claims 1 to 9 in the production, transportation or storage of smoking materials.

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