A method for comparing consistency of a comprehensive test platform for physical properties of cigarettes

Abstract

The application discloses a consistency comparison test method of a cigarette physical performance comprehensive test platform, and comprises the following steps: (1) obtaining standard cigarette samples for testing through uniformity test; (2) testing the comprehensive test platform with the standard cigarette samples one by one, and recording test results of each detection unit; (3) statistically calculating the test results by using a Z ratio score method; (4) judging the measurement results according to a Z ratio score judgment criterion; (5) calculating an index offset; (6) judging the measurement results according to an index offset judgment criterion; and (7) result application: comprehensively judging the consistency of the test comprehensive test platform according to the two-stage judgment results. The application provides an accurate and scientific method for evaluating the measurement performance consistency of the physical performance comprehensive test platform, avoids the influence of inconsistent measurement results between different comprehensive test platforms on the quality of cigarette products, and has practical significance for guiding cigarette production.

Description

Technical Field

[0001] This invention belongs to the field of tobacco manufacturing technology, specifically relating to a comparative testing method for a comprehensive testing platform for the physical properties of cigarettes (cigarette sticks or filter rods). Background Technology

[0002] In cigarette factories, comprehensive testing benches for the physical properties of cigarettes (cigarette sticks or filter rods) are key testing equipment used to detect physical quality indicators such as weight, circumference, length, draw resistance, and ventilation rate. Their measurement performance directly affects the quality of cigarette rolling. Currently, cigarette factories generally face the problem of numerous manufacturers and significant differences in equipment models for comprehensive testing benches, resulting in poor reliability and comparability of test data from different devices. Routine comparative testing of results from different comprehensive testing benches is a necessary means to ensure consistency of test results. Currently, the tobacco industry lacks scientific, unified, and standardized comparative testing methods and means.

[0003] Patent CN2022112012625 discloses a method for measuring the performance of a cigarette comprehensive testing platform, mainly used to test the stability of the testing performance of a single comprehensive testing platform. Patent CN202311668049X discloses a method for calculating the En value based on preset parameters and measurement data from a traceability rod, and then comprehensively evaluating the En value and error. However, the applicability of this evaluation method is limited by the influence of different equipment models. Patent CN2023100587062 discloses a composite standard rod for measuring cigarettes and filter rods, which can improve the efficiency of calibration and standardization, providing a measurement device for the daily calibration of factory comprehensive testing platforms.

[0004] The above invention patents provide some reference for the testing performance of integrated test benches, mainly focusing on providing measurement equipment and testing equipment to test performance stability, with less research on testing the consistency of test results.

[0005] This invention is proposed for this purpose. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a comparative testing method for a comprehensive cigarette physical performance testing platform. This method is used for comparing the consistency of test results across multiple comprehensive cigarette physical performance testing platforms in a cigarette factory. It plays a crucial role in ensuring the consistency of test results from different testing instruments in a factory, guaranteeing cigarette product quality, and guiding cigarette production.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A consistency comparison test method for a comprehensive testing platform for the physical properties of cigarettes includes the following steps:

[0009] (1) Under normal production conditions, cigarette samples are continuously taken from the machine. The sampling amount should meet the total sampling requirements of the comprehensive test bench for comparison testing. After removing obviously abnormal samples, a uniformity test is carried out on the cigarette samples. Cigarette samples that pass the uniformity test are used as standard cigarette samples for testing.

[0010] (2) Test each of the comprehensive test benches using standard cigarette samples. Test 20-30 standard cigarette samples on each bench and record the test results of each test unit, including weight, circumference, draw resistance, length, hardness, and total ventilation rate. Calculate the average value.

[0011] (3) The Z-score of each test unit of each integrated test bench is obtained by statistically calculating the test results using the Z-score method.

[0012] (4) Judgment of “Z-score” results: The performance of each test unit of each integrated test bench is judged; the judgment criteria are: the test unit with |Z| < 3.0 is satisfactory; the test unit with |Z| ≥ 3.0 is unsatisfactory or outlier and should be given a result warning.

[0013] (5) Based on the "Z ratio" method determination result in step (3), calculate the "index offset" for the detection unit with |Z|≥3.0;

[0014] (6) The results are judged based on the calculation results of the offset of each index. The judgment criteria are as follows: if the offset of the weight index is ≤0.005g, the offset of the circumference index is ≤0.02mm, the offset of the suction resistance index is ≤1.0% of the measured center value, the offset of the length index is ≤0.05mm, and the offset of the total ventilation rate index is ≤3.0%, it is judged as qualified; otherwise, it is unqualified.

[0015] (7) Application of results: Based on the two-level judgment conclusions of steps (4) and (6), the test unit that is qualified can be used normally; the test unit that is unqualified should be repaired and compared again; it can only be used normally after it is qualified.

[0016] Preferably, the method for the cigarette sample uniformity test in step (1) adopts the method specified in CNAS-GL003:2018 "Guideline for evaluating the uniformity and stability of proficiency testing samples".

[0017] Preferably, the Z-score calculation formula in step (3) is: Z-score = (test results of each test bench - median value) / standard interquartile range.

[0018] Preferably, the formula for calculating the index offset in step (5) is: Index offset = Index test value - Average value of test results of each integrated test bench detection unit with other |Z| < 3.0.

[0019] Preferably, the cigarette includes a cigarette stick and a filter rod.

[0020] Preferably, in step (1), the cigarette standard sample is a dedicated cigarette traceability stick.

[0021] Preferably, the median and standard interquartile range are calculated using the test results from all integrated test benches.

[0022] Preferably, the index test value is the test result of each test bench detection unit in step (3).

[0023] Compared with the prior art, the beneficial effects of this invention are as follows:

[0024] The consistency comparison test method for the comprehensive testing platform for the physical properties of cigarettes of this invention provides a scientific and accurate way to detect the consistency of comprehensive testing platforms for the physical properties of cigarettes in a factory. It avoids the impact on cigarette product quality caused by inconsistencies in measurement results between different comprehensive testing platforms, fills a gap in existing tobacco testing technology, and has practical guiding significance for the daily management of testing equipment in cigarette factories and for ensuring the quality of cigarette products.

[0025] The method for comparing the consistency of test results among multiple cigarette physical performance comprehensive testing benches established by this invention can also be used to conduct joint tests between different laboratories. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to embodiments. Those skilled in the art will understand that the following embodiments are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0027] The present invention provides a consistency comparison test method for a comprehensive testing platform for the physical properties of cigarettes, comprising the following steps:

[0028] (1) Under normal production conditions, cigarette samples shall be continuously taken from the machine, and the sampling quantity shall meet the total sampling quantity requirements of the comprehensive test bench for comparison testing; after removing obviously abnormal samples, a uniformity test shall be carried out on the cigarette samples, and the cigarette samples that pass the uniformity test shall be used as the standard cigarette samples for testing; the method for the uniformity test of cigarette samples shall be the method specified in CNAS-GL003:2018 "Guideline for Evaluation of Uniformity and Stability of Proficiency Testing Samples"; cigarettes include cigarette sticks and filter rods;

[0029] (2) Test each comprehensive test bench with standard cigarette samples, with 20-30 standard cigarette samples tested on each bench. Record the test results of each test unit, including weight, circumference, draw resistance, length, hardness, and total ventilation rate, and calculate the average value. The standard cigarette samples are preferably tested with a dedicated cigarette monitoring and traceability stick.

[0030] (3) The Z-score of each test unit of each integrated test bench is obtained by statistical calculation of the test results using the “Z-score” method. The Z-score is calculated as follows: Z-score = (test results of each test bench - median) / standard interquartile range. The median and standard interquartile range are calculated using the test results of all integrated test benches.

[0031] (4) Judgment of “Z-score” results: The performance of each test unit of each integrated test bench is judged; the judgment criteria are: the test unit with |Z| < 3.0 is satisfactory; the test unit with |Z| ≥ 3.0 is unsatisfactory or outlier and should be given a result warning.

[0032] (5) Based on the results of the “Z ratio” method in step (3), calculate the “index offset” for the detection unit with |Z| ≥ 3.0; the formula for calculating the index offset is: index offset = index test value - the average of the test results of each integrated test bench detection unit with |Z| < 3.0; the index test value is the test result of each test bench detection unit in step (3);

[0033] (6) The results are judged based on the calculation results of the offset of each index. The judgment criteria are as follows: if the offset of the weight index is ≤0.005g, the offset of the circumference index is ≤0.02mm, the offset of the suction resistance index is ≤1.0% of the measured center value, the offset of the length index is ≤0.05mm, and the offset of the total ventilation rate index is ≤3.0%, it is judged as qualified; otherwise, it is unqualified.

[0034] (7) Application of results: Based on the two-level judgment conclusions of steps (4) and (6), the test unit that is qualified can be used normally; the test unit that is unqualified should be repaired and compared again; it can only be used normally after it is qualified.

[0035] Example

[0036] According to the consistency comparison test method for the test results of the comprehensive cigarette physical performance test bench established in this invention, a consistency comparison test was conducted on 11 conventional cigarette comprehensive test benches used in production at a cigarette factory. The specific implementation steps are as follows:

[0037] a. Preparation of standard cigarette samples:

[0038] Under normal production conditions of the cigarette machine, approximately 2,000 cigarette samples of a specific brand are continuously taken from the machine. A uniformity test is conducted on the cigarette samples. Samples that pass the uniformity test are used as standard samples. Samples that fail the uniformity test cannot be used as standard samples and need to be resampled and tested. If the cigarette factory has cigarette monitoring and traceability rods, it is recommended to use the cigarette monitoring and traceability rods as standard cigarette samples.

[0039] b. Sample testing:

[0040] Eleven slim cigarette testing benches at a cigarette factory were tested using prepared standard cigarette samples. The details of the testing benches participating in the comparative test are shown in Table 1 below.

[0041] Table 1

[0042]

[0043] The testing units included: mass, circumference, suction resistance, length, and total ventilation rate. One set (20 standard samples) was tested per unit, and the test results were recorded. The statistical mean values ​​are shown in Table 2 below.

[0044] Table 2

[0045]

[0046] c. Calculation and evaluation using the "Z-ratio" method:

[0047] The test results of each integrated test bench detection unit are calculated according to the "Z-ratio" method used in this invention. Taking the "C1 integrated test bench - quality unit" as an example, the statistical calculation method is as follows:

[0048] In the table above, column 1 (quality) data shows that the median value of the quality test results for the 11 integrated test benches is 1.201, the standard interquartile range is 0.0006, and the Z-score for quality unit C1 is (1.1992 - 1.201) / 0.0006 = -2.5181. The calculation method for the Z-scores of each test unit on the other integrated test benches is the same as above. The calculation results for the Z-scores of each test unit on the 11 integrated test benches are shown in Table 3 below.

[0049] Table 3

[0050]

[0051] According to the "Z-ratio" method used in this invention, for all testing units of the above integrated test benches, C1-C5 and C8-C10, |Z| is less than 3.0, and all testing units are directly judged as qualified. For other testing units: C6 circumference, C7 total ventilation rate, and C11 mass, |Z| is ≥3.0, and the test results are initially judged to have problems, requiring secondary judgment using the "index offset" method in this invention.

[0052] d. Evaluation of "Indicator Offset":

[0053] The "index offset" is calculated based on the detection results of the detection units for C6 circumference, C7 total ventilation rate, and C11 quality according to the method in this invention.

[0054] Index offset = Index test value - Average of test results of each integrated test bench detection unit with |Z| < 3.0; According to the above formula, C6 circumference "index offset" = 16.979 - 16.969 = 0.010, C7 total ventilation rate "index offset" = 32.5% - 31.0% = 1.5%, C11 quality "index offset" = 1.2031 - 1.2004 = 0.0027;

[0055] The calculated offset results of the above three detection units all meet the offset judgment conditions: circumferential offset ≤ 0.02mm, total ventilation rate offset ≤ 3.0%, and mass offset ≤ 0.005g; the test results of the three detection units are deemed qualified.

[0056] e. Overall Judgment Conclusion:

[0057] Based on the above two levels of judgment, all test unit results of the 11 integrated test benches tested were qualified, the measurement performance of the factory integrated test benches was good, and the test results among the integrated test benches were consistent.

[0058] The specific embodiments of the above testing methods illustrate that the comparative testing method for a comprehensive cigarette testing platform provided by this invention is scientific, accurate, and easy to operate. It can be used for routine comparative analysis of measurement consistency on comprehensive testing platforms in cigarette factories; this is of significant importance for ensuring factory testing standards and product quality stability. The above embodiments are only used for consistency comparison on comprehensive cigarette testing platforms; this method can also be used for consistency comparison on comprehensive filter rod testing platforms.

[0059] The basic principles, main features, and advantages of this invention have been described above. This invention is not limited to the above embodiments; the embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A consistency comparison test method for a comprehensive testing platform for the physical properties of cigarettes, characterized in that, Includes the following steps: (1) Take cigarette samples continuously, remove obviously abnormal samples, and conduct a uniformity test on the cigarette samples. Cigarette samples that pass the uniformity test are used as standard cigarette samples for testing. (2) Test each of the comprehensive test benches using standard cigarette samples, with 20-30 standard cigarette samples tested on each bench. Record the test results of each test unit for weight, circumference, draw resistance, length, hardness and total ventilation rate, and calculate the average value. (3) The Z-score of each test unit of each integrated test bench is obtained by statistically calculating the test results using the Z-score method. (4) Judgment of "Z ratio score": The performance of each test unit of each integrated test bench is judged; the judgment criterion is: the test unit with |Z| < 3.0 is considered to have a satisfactory result; For detection units with |Z| ≥ 3.0, which represent unsatisfactory or outlier results, a result warning should be issued. (5) Based on the "Z ratio" method determination result in step (3), calculate the "index offset" for the detection unit with |Z| ≥ 3.0; (6) The results are judged based on the calculation results of the offset of each index. The judgment criteria are as follows: if the offset of the weight index is ≤0.005g, the offset of the circumference index is ≤0.02mm, the offset of the suction resistance index is ≤1.0% of the measured center value, the offset of the length index is ≤0.05mm, and the offset of the total ventilation rate index is ≤3.0%, it is judged as qualified; otherwise, it is unqualified. (7) Application of results: Based on the two-level judgment conclusions of steps (4) and (6), the test unit that is qualified can be used normally; the test unit that is unqualified should be repaired and compared again; it can only be used normally after it is qualified.

2. The consistency comparison test method according to claim 1, characterized in that, The method for the cigarette sample uniformity test in step (1) is the method specified in CNAS-GL003:2018 "Guideline for evaluating the uniformity and stability of proficiency testing samples".

3. The consistency comparison test method according to claim 1, characterized in that, The Z-score calculation formula for step (3) is: Z-score = (test results of each test bench - median value) / standard interquartile range.

4. The consistency comparison test method according to claim 1, characterized in that, The formula for calculating the index offset in step (5) is: Index offset = Index test value - Average of the test results of each integrated test bench detection unit with other |Z| < 3.

0.

5. The consistency comparison test method according to claim 1, characterized in that, Cigarettes consist of the cigarette stick and the filter.

6. The consistency comparison test method according to claim 1, characterized in that, In step (1), the standard sample of cigarettes is a special cigarette traceability stick.

7. The consistency comparison test method according to claim 3, characterized in that, The median and standard interquartile range were calculated using the test results from all integrated test benches.

8. The consistency comparison test method according to claim 4, characterized in that, The index test value is the test result of each test bench detection unit in step (3).

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