Method for evaluating falling tendency of cigarette combustion cone

Abstract

The invention discloses a method for evaluating the falling tendency of a cigarette combustion cone. According to the method, a manipulator simulation device is adopted to perform simulated smoking on the cigarette, the maximum deviation degree of the cigarette combustion cone is measured, then the over-deviation proportion of the cigarette combustion cone is calculated through the maximum deviation degree of the cigarette combustion cone, and then the head falling tendency of the cigarette combustion cone is evaluated through the over-deviation proportion. The brand new method for evaluating the falling tendency of the cigarette combustion cone is provided, and compared with an existing method for evaluating the falling tendency of the cigarette combustion cone through falling and non-falling state information of the cigarette combustion cone, the method can reflect the state of the cigarette combustion cone more accurately, directly and timely.

Description

Technical Field

[0001] The present invention belongs to the technical field of cigarette performance detection, and particularly relates to a method for evaluating the head-drop tendency of a cigarette burning cone. Background Art

[0002] With the continuous development of the tobacco industry, as a mass consumer product, the quality and safety of cigarettes have received increasing widespread attention. Among them, the head-drop tendency of a cigarette burning cone is one of the important indicators for evaluating the quality and safety of cigarettes. Therefore, in-depth research on the testing technology of the head-drop tendency of a cigarette burning cone is of great significance for improving cigarette quality, protecting consumers' rights and interests, and promoting the high-quality development of the industry.

[0003] The head-drop of a cigarette burning cone refers to the phenomenon that during the suction process, due to the flicking behavior of consumers, the burning cone of the cigarette falls off from the main part of the cigarette stick. This phenomenon will not only cause the suction to be interrupted, seriously affecting the cigarette consumption experience, but also may cause potential safety hazards such as fires.

[0004] In order to accurately evaluate the head-drop tendency of a cigarette burning cone, currently, usually according to the standard YC / T 558 "Test for Head-Drop Tendency of Cigarette Burning Cones", the head-drop tendency of the cigarette burning cone is tested. In this standard, the state information of "falling" and "not falling" of the cigarette burning cone is recorded during the simulated suction process to evaluate the head-drop tendency of the cigarette burning cone. During the test, m cigarette samples are randomly selected as the test materials for testing, the state information of "falling" and "not falling" of the cigarette burning cone during the simulated suction process is recorded, and then the head-drop tendency (CCFP) of the cigarette burning cone is calculated according to formula (1), and the result is accurate to 1%.

[0005] CCFP = n / m × 100% ……………… (1)

[0006] In the formula:

[0007] CCFP - the head-drop tendency of the burning cone, %;

[0008] n - the number of cigarette sticks with the burning cone dropping, unit: piece (cig);

[0009] m - the number of cigarette sticks tested, unit: piece (cig).

[0010] In existing detection methods, although it is possible to evaluate the tendency of the cigarette burning cone to drop its head (CCFP) by simulating the state information of the "falling" and "not falling" of the cigarette burning cone during the suction process, some difficult-to-define problems often occur during the actual operation. For example, when simulating the human cigarette suction action, we usually set a fixed suction frequency. Depending on different standards and suction modes, the interval time also varies, usually with a suction every 60s or 30s. During this process, we may encounter a situation where when the burning cone of the cigarette has not completely dropped but only deviated from its original position, due to the force of the next suction, this deviated burning cone will be sucked back into the cigarette, resulting in a re-ignition phenomenon. Although from a test perspective, the burning cone has not truly dropped in such a situation, when consumers actually smoke, in the face of such a scenario, they are very likely to think that the burning cone has dropped. Therefore, a phenomenon may occur: in the laboratory tests, no problem of the burning cone dropping its head was found for this batch of cigarettes, yet in the actual consumer feedback, some people reported that there was a phenomenon of the burning cone dropping. This difference directly affects the accurate assessment of the cigarette burning performance, causing a certain deviation between the test results and the actual consumer experience. In addition, the existing detection data quantification indicators are relatively single, only evaluating the cigarette burning performance by whether the burning cone drops, which leads to our inability to accurately evaluate the potential tendency of the product's burning cone to drop.

[0011] Therefore, to solve these problems, it is particularly necessary to deeply study the test technology for the tendency of the cigarette burning cone to drop its head and propose a new evaluation method for the tendency of the cigarette burning cone to drop its head.

[0012] To solve the above problems, the present invention is proposed. Summary of the Invention

[0013] The present invention aims to overcome the deficiency in the prior art of lacking an evaluation method for the tendency of the cigarette burning cone to drop its head, and proposes a new evaluation method for the tendency of the cigarette burning cone to drop its head.

[0014] The technical solution adopted by the present invention is:

[0015] The present application discloses a method for evaluating the tendency of the cigarette burning cone to drop its head, which uses a manipulator simulation device to perform the whole process of simulated human suction actions on the cigarette (the whole process of simulated human suction actions refers to: including typical consecutive suction actions such as the manipulator simulating lighting a cigarette, suction, swinging the arm and turning the wrist to flick the ash, holding the cigarette on the desk, discarding the cigarette butt and waiting, etc.), measures the maximum deviation degree of the cigarette burning cone, and then uses the maximum deviation degree of the cigarette burning cone to evaluate the tendency of the cigarette burning cone to drop its head;

[0016] The manipulator simulation device described above includes a control system, a manipulator, a camera system, a lighting system, and a cigarette lighting system;

[0017] The control system is respectively connected to the manipulator, the camera system, the lighting system and the cigarette lighting system, and is used to control the movement of the manipulator, as well as the operation of the camera system, the lighting system and the cigarette lighting system. It is also used to collect and process the pictures taken by the camera system to obtain the maximum deviation degree of the cigarette burning cone.

[0018] There are multiple cameras in the camera system.

[0019] The method for evaluating the head - dropping tendency of the cigarette burning cone includes the following steps:

[0020] Step (1), clamp the cigarette to be detected with the manipulator, and place the cigarette in the axial direction of the clamping position perpendicular to the cameras of the camera system and the light source of the lighting system; start the camera system and the lighting system through the control system.

[0021] Step (2), start the manipulator and the cigarette lighting system through the control system. The manipulator and the cigarette lighting system cooperate to simulate the human cigarette - lighting action. After lighting the cigarette to be detected, the manipulator starts to perform suction, swing the arm, turn the wrist, hold the cigarette on the table, and flick the ash actions according to the cigarette suction path of the human body. The camera system performs real - time image acquisition on the burning cone after the cigarette flicks the ash.

[0022] Step (3), when the cigarette burns to the position of the cigarette butt length, end the test.

[0023] Step (4), process all the burning cone images collected by the camera system to determine the maximum deviation degree of the cigarette burning cone in the cigarette burning cone deviation degree image.

[0024] Step (5), calculate the over - deviation ratio of the cigarette burning cone through the maximum deviation degree of the cigarette burning cone:

[0025] For regular cigarettes, the over - deviation ratio of the cigarette burning cone of this batch is: the number of cigarettes with the maximum deviation degree of the cigarette burning cone greater than 20 degrees / the total number of cigarettes in this batch;

[0026] For medium - sized cigarettes, the over - deviation ratio of the cigarette burning cone of this batch is: the number of cigarettes with the maximum deviation degree of the cigarette burning cone greater than 15 degrees / the total number of cigarettes in this batch;

[0027] For slender cigarettes, the over - deviation ratio of the cigarette burning cone of this batch is: the number of cigarettes with the maximum deviation degree of the cigarette burning cone greater than 20 degrees / the total number of cigarettes in this batch;

[0028] Step (6), according to the following criteria, evaluate the head - dropping tendency of the cigarette burning cone through the over - deviation ratio of the cigarette burning cone;

[0029] If the over - deviation ratio of the cigarette burning cone of this batch is greater than 10%, it is determined that: the head - dropping tendency of the cigarette burning cone of this batch is high, and the head - dropping quality of the cigarette burning cone of this batch is unqualified.

[0030] If the over - deviation ratio of the burning cone of this batch of cigarettes is less than or equal to 10%, it is determined that: the falling - head tendency of the burning cone of this batch of cigarettes is low, and the falling - head quality of the burning cone of this batch of cigarettes is qualified.

[0031] The calculation method of the maximum deviation degree of the cigarette burning cone is as follows: in the burning - cone image obtained in step (2), the intersection point of the carbon line of the burning cone and the cigarette axis is marked as point A, and the farthest - end point of the burning cone extending in the direction parallel to the cigarette axis is marked as the vertex of the burning cone, also marked as point P;

[0032] Then the included - angle degree between the straight line formed by connecting point A and point P and the cigarette axis is the deviation degree of the cigarette burning cone, as Figure 1 shown;

[0033] Among the several burning - cone images of the cigarette, the maximum value of the deviation degree of the cigarette burning cone is the maximum deviation degree of the cigarette burning cone of this cigarette.

[0034] The carbon line refers to the boundary line between the circumference of the unburned part of the cigarette and the burning cone.

[0035] Preferably, first compare and obtain the maximum deviation degree of the cigarette burning cone in the burning - cone images taken by different cameras at the same time;

[0036] Then compare the maximum deviation degree of the cigarette burning cone after each cigarette ash - flicking, and obtain the maximum deviation degree of the cigarette burning cone during the suction process of the whole cigarette.

[0037] Preferably, the manipulator is a 6R - type manipulator, and its coordinate system executes the standard coordinate system specified in GB / T 16977 - 2005.

[0038] Preferably, the cigarette to be detected is pretreated as a sample according to the standard of GB / T 16447 before measurement.

[0039] Preferably, when simulating the human - like cigarette - sucking action, the ISO, FTC, Massachusetts or Canadian deep - suction mode is adopted; among them, the ISO, FTC, Massachusetts or Canadian deep - suction frequencies are suction once every 60 s, 60 s, 30 s, 30 s respectively.

[0040] Preferably, there are 3 cameras, which are symmetrically arranged with the cigarette rod as the center; there are 3 light sources, which are symmetrically arranged with the cigarette rod as the center.

[0041] Preferably, the image acquisition system automatically acquires images for processing once every 2 s.

[0042] Preferably, the size of the photosensitive element of the camera ≥15 mm, and the pixel size ≥1.22 μm×1.22 μm; the color temperature of the light source ≥4500 K.

[0043] Preferably, during the process of collecting and processing the image of the cigarette in step (3), the uncertainty of the endpoint of the cigarette burning cone will directly lead to the uncertainty of the maximum deviation degree of the cigarette burning cone. Determining the endpoint of the cigarette burning cone is a difficult point in image processing. In this application, a method of scanning pixel by pixel is adopted to find the endpoint of the cigarette burning cone, which specifically includes the following steps:

[0044] (1) Collect the cigarette burning image. After binarizing the image, the gray values Gray of the cigarette and the background will be distinguished as 255 and 0;

[0045] (2) According to the position of the cigarette, use ROI to crop the image, and obtain the resolution of the cropped image as x·y;

[0046] (3) Starting from the upper right endpoint (x, 0) of the image, scan row by row and column by column from right to left and from top to bottom, and find the first pixel point (x i , y i ) with the gray value Gray = 255 from the background row and column pixels. The coordinates of this pixel point are the vertex coordinates of the cigarette burning cone. As Figure 1 shown.

[0047] Preferably, the conventional cigarette has a circumference of 22.50 mm to 26.00 mm, the medium cigarette has a circumference of 18.0 mm to 22.50 mm, and the slender cigarette has a circumference of 16.0 mm to 18.0 mm;

[0048] The above numerical ranges all include the minimum value and do not include the maximum value.

[0049] For example, the circumference of the conventional cigarette is equal to or greater than 22.50 mm and less than 26.00 mm.

[0050] The circumference of the medium cigarette is equal to or greater than 18.0 mm and less than 22.50 mm.

[0051] The circumference of the slender cigarette is equal to or greater than 16.0 mm and less than 18.0 mm.

[0052] In the present invention, for the robotic arm that simulates the cigarette suction process and suction environment and the method of collecting the cigarette burning image by the full-vision camera system, reference can be made to the series of patents on cigarette burning performance based on machine vision applied by the present applicant, with the application number: 2020103139473, and the title: A robotic arm for simulating the human cigarette suction process and suction environment and its simulation method; application number: 2020103234251, and the title: A smoking path simulation system based on a robotic hand; similarly, the test devices and test methods of the above patents are incorporated into this patent.

[0053] Compared with the prior art, the present invention has the following beneficial effects:

[0054] 1. The present invention uses a manipulator simulation device to simulate the puffing of cigarettes, and uses the proportional method to evaluate the head-drop tendency of the cigarette burning cone by using the super-deviation ratio of the cigarette burning cone. Therefore, the present application provides a brand-new method for evaluating the head-drop tendency of the cigarette burning cone. Compared with the existing method of evaluating the head-drop tendency of the cigarette burning cone through the state information of "falling" and "not falling" of the cigarette burning cone, the present invention can more accurately, directly and timely reflect the state of the cigarette burning cone.

[0055] In particular, the super-deviation ratio of the cigarette burning cone is statistically obtained by the maximum deviation angle value of the burning cone of cigarettes with a consumer-identified head-drop rate greater than 60%. And the maximum deviation angle value of the burning cone of cigarettes with a consumer-identified head-drop rate greater than 60% is related to the cigarette circumference. For regular cigarettes and slender cigarettes, the maximum deviation angle value of the burning cone of cigarettes with a consumer-identified head-drop rate greater than 60% is 20 degrees; for medium-sized cigarettes, the maximum deviation angle value of the burning cone of cigarettes with a consumer-identified head-drop rate greater than 60% is 15 degrees.

[0056] 2. The evaluation method of the present invention can more finely evaluate the head-drop tendency of the cigarette burning cone, rather than simply the two states of "falling" and "not falling".

[0057] 3. The method for evaluating the head-drop tendency of the cigarette burning cone of the present invention can more accurately evaluate the state of the cigarette burning cone, thereby more accurately evaluating the quality and safety of cigarettes, and providing more reliable products for consumers. At the same time, accurately evaluating the head-drop tendency of the cigarette burning cone helps to guide the improvement and optimization of the cigarette production process and improve the overall quality of cigarettes. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 It is a schematic diagram of the scanning of the burning cone endpoint.

[0059] Figure 2 It is a measured diagram of the deviation of the burning cone of a cigarette during the detection process and a schematic diagram of the deviation degree of the burning cone. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0060] The present invention will be further described below by way of examples, which are not limited to this embodiment. For the experimental methods without specific conditions indicated in the examples, they are usually carried out according to the conventional conditions and the conditions described in the manual, or according to the conditions recommended by the manufacturer. For general equipment, materials, reagents, etc., if not otherwise specified, they can all be obtained from commercial channels.

[0061] The specific steps of the method of the present invention are as follows:

[0062] 1. Preparation of samples

[0063] (1) For the inspection lot samples, sampling shall be carried out in accordance with the provisions of GB / T 5606.1 Cigarettes - Part 1: Sampling. Randomly select two packages of cigarette products from the inspection lot to form the laboratory samples. Draw 6 cigarettes from each box in units of strips. After mixing, a total of 120 cigarettes are used as the test samples, of which 60 are for testing and the remaining cigarettes are backup samples.

[0064] (2) For process experiment and small - sample test samples, cigarettes are produced under the same specifications and experimental conditions. When the test samples cannot meet the requirements of batch sampling, at least 6 boxes of cigarette samples shall be provided. After mixing the cigarette samples, a total of 120 cigarettes are used as the test samples, of which 60 are for testing and the remaining cigarettes are backup samples.

[0065] (3) Detection is carried out and the results are characterized according to 40 cigarettes per group.

[0066] (4) When the test sample groups are preferably prepared in accordance with the above requirements. When the number of samples is small and cannot meet the above requirements, the tests can also be prepared according to the actual quantity.

[0067] (5) Methods for conditioning the test specimens: ① To examine the random performance of the samples in the market, the samples are directly tested without conditioning. ② To examine the consistency of the samples, the test specimens are conditioned in accordance with the requirements of GB / T 16447 and then tested.

[0068] (6) In this embodiment, since it involves the comparative detection of two methods, therefore, when actually preparing samples, 2 - fold parallel sample preparation is carried out.

[0069] 2. Test process

[0070] The test cigarette samples are subjected to a complete suction detection and data recording according to the selected suction mode under the action conditions of the whole - process movement of the simulated human suction. The test of the samples is stopped when the cigarette butt position specified in GB / T 19609 Determination of total particulate matter and tar of cigarettes using a routine analytical smoking machine is reached.

[0071] 3. Test results and evaluation

[0072] The test results are derived according to the maximum value of the deviation degree of the cigarette combustion cone of each test sample cigarette. The statistics are shown in Table B. In the table, the commonly used head - dropping ratio evaluation method is compared with the over - deviation ratio evaluation method of this application. The commonly used head - dropping ratio evaluation method, also called the head - dropping evaluation method, is to judge whether it is qualified by the proportion of the number of cigarette heads dropped in the inspection lot, that is, the head - dropping ratio. Usually, the qualified rate of the head - dropping ratio of the test sample size is set to ≤5%.

[0073] Table A.1 Evaluation method for single - cigarette samples

[0074]

[0075] Table A.2 Evaluation Method for the Batch of Tested Cigarette Samples

[0076]

[0077] Table B Comparison between the Common Tip - off Evaluation Method and the Ratio Evaluation Method of the Present Application

[0078]

[0079] In the ratio method of the present application:

[0080] For regular cigarettes, the over - deviation ratio of the burning cone of this batch of cigarettes is: the number of cigarettes with the maximum deviation of the burning cone greater than 20 degrees / the total number of cigarettes in this batch;

[0081] For medium - sized cigarettes, the over - deviation ratio of the burning cone of this batch of cigarettes is: the number of cigarettes with the maximum deviation of the burning cone greater than 15 degrees / the total number of cigarettes in this batch;

[0082] For slender cigarettes, the over - deviation ratio of the burning cone of this batch of cigarettes is: the number of cigarettes with the maximum deviation of the burning cone greater than 20 degrees / the total number of cigarettes in this batch.

[0083] It can be seen from the above results:

[0084] (1) In the evaluation results of the present application, 60% of the samples judged by the crowd have the burning cone dropped, which is better for the comprehensiveness, objectivity and early warning of product quality judgment;

[0085] (2) From the evaluation results, there may be misjudgments in the common tip - off evaluation method. The main reason is that in the detection process, only the completely tip - off samples are counted, and the samples with serious cone deviation, which are judged by consumers as tip - off, are not counted. For example: for the test sample 3 - 3#, no tip - off occurred using the common tip - off evaluation method, but from the perspective of cone deviation, there are already a large number of samples with quality hidden dangers;

[0086] (3) It can be seen from the evaluation results that the ratio evaluation method of the present application has better recognition and discrimination.

[0087] Example 1: Regular - circumference Cigarettes

[0088] 1. Test Results

[0089] Under the ISO suction mode standard, the deviation degree of the cigarette burning cone of conventional round cigarettes (cigarette rod diameter: 7.7 mm, circumference: 24 mm) was tested. Two groups of parallel samples were tested at 40 cigarettes per group, and the test results are shown in Table 1.1. Table 1.1 also records the test results using the tapping mode in accordance with YC / T 558. Table 1.2 shows the typical test results and physical diagrams of the samples for detecting the maximum deviation degree of the burning cone of conventional round cigarettes. The method for detecting the maximum deviation degree of the cigarette burning cone is as shown in the specification of this application.

[0090] Table 1.1.1 Results of the YC / T 558 Detection Method for Conventional Round Cigarette Samples (Unit: degree)

[0091]

[0092] Table 1.1.2 Results of the Detection Method for the Maximum Deviation Degree of the Burning Cone of Conventional Round Cigarettes (Unit: degree)

[0093]

[0094]

[0095] Table 1.2 Typical Test Results and Physical Diagrams of the Samples for Detecting the Maximum Deviation Degree of the Burning Cone of Conventional Round Cigarettes (Unit: degree)

[0096]

[0097] 2. Evaluation and Analysis

[0098] The dropping rates of the cigarette burning cones and the samples with a maximum deviation degree of the burning cone greater than 20 degrees in the test sample groups 1 and 2 were statistically analyzed, as shown in Table 1.3.

[0099] Table 1.3

[0100]

[0101] Using the statistical values of the test samples, the dropping tendency of the burning cone of the test samples was evaluated according to the evaluation comparison interval in Table A.2.

[0102] Table 1.4 Evaluation Table for the Dropping Tendency of the Burning Cone of Conventional Cigarettes

[0103]

[0104] According to Tables 1.3 and 1.4, it can be concluded that when the ratio method of the present application is used to evaluate Sample Group 1 and Sample Group 2, both groups of samples are qualified. Calculated according to the YC / T 558 method (Tobacco Industry Standard of the People's Republic of China, Test for the Tendency of the Cigarette Burning Cone to Drop Head), the tendency of the cigarette burning cone of Sample Group 1 and Sample Group 2 is 0, indicating that the two methods are consistent to a certain extent. However, it can also be seen from Table 1.2 that some samples show a deviation of the burning cone during smoking, which may potentially affect the consumption experience.

[0105] Example 2: Medium-circumference cigarettes

[0106] 1. Test results

[0107] Under the standard of the deep-drawing suction mode in Canada, the deviation degree of the cigarette burning cone of medium-circumference cigarettes (cigarette rod diameter: 6.4 mm, circumference: 20 mm) is tested. The test is carried out according to 40 cigarettes per group, and the test results are shown in Table 2.1. Table 2.1 also records the test situation using the tapping mode according to YC / T 558. Table 2.2 shows the typical test results and physical pictures (unit: degree) of the samples for detecting the maximum deviation degree of the cigarette burning cone of medium-circumference cigarettes. The method for detecting the maximum deviation degree of the cigarette burning cone is as shown in the specification of the present application.

[0108] Table 2.1.1 Results of the YC / T 558 detection method for medium-circumference cigarette samples

[0109]

[0110]

[0111] Table 2.1.2 Results of the detection method for the deviation degree of the cigarette burning cone of medium-circumference cigarettes (unit: degree)

[0112]

[0113] Table 2.2 Typical test results and physical pictures of the samples for detecting the maximum deviation degree of the cigarette burning cone of medium-circumference cigarettes (unit: degree)

[0114]

[0115]

[0116] 2. Evaluation and analysis

[0117] The drop rate of the cigarette burning cone and the samples with a deviation angle of the cigarette burning cone greater than 15 degrees in the detected Sample Groups 1 and 2 are statistically analyzed, as shown in Table 2.3.

[0118] Table 2.3

[0119]

[0120] The statistical value of the test sample is adopted, and the burning cone dropping tendency of the test sample is evaluated according to the comparison interval in Table A.2.

[0121] Evaluation Table of the Burning Cone Dropping Tendency of Cigarettes in Table 2.4

[0122]

[0123] According to Tables 2.3 and 2.4, it can be obtained that the sample groups 1 and 2 are evaluated by YC / T 558 and the ratio method of this application, and both groups of samples are qualified. However, in the samples evaluated by the ratio method of this application, there are samples that consumers identify as the dropping of the cigarette burning cone, indicating that during the test, the evaluation of the dropping tendency of the cigarette burning cone by the ratio method of this application is closer to the actual consumption experience.

[0124] Example 3: Slim Circumference Cigarettes

[0125] 1. Slim Circumference Cigarettes

[0126] Under the ISO puffing mode standard, the deviation degree of the burning cone of slim circumference cigarettes (cigarette rod diameter: 5.4 mm, circumference: 17 mm) is tested. The test is carried out in groups of 40 cigarettes, and the test results are shown in Table 3.1. Table 3.1 also records the test situation using the tapping mode according to YC / T 558. The detection method of the maximum deviation degree of the cigarette burning cone is as shown in the specification of this application.

[0127] Table 2.1.1 Test Results of the Detection Method of Slim Circumference Cigarette Samples by YC / T 558

[0128]

[0129] Table 2.1.2 Test Results of the Detection Method of the Maximum Deviation Degree of the Burning Cone of Slim Circumference Cigarettes (Unit: degree)

[0130]

[0131]

[0132] Table 2.2 Typical Test Results and Physical Drawings of the Detection Samples of the Maximum Deviation Degree of the Burning Cone of Slim Circumference Cigarettes (Unit: degree)

[0133]

[0134] 2. Evaluation and Analysis

[0135] The dropping rates of the burning cones of the test sample groups 1 and 2 and the samples with the maximum deviation angle of the burning cone greater than 20 degrees are statistically counted, as shown in Table 3.3.

[0136] Table 3.3

[0137]

[0138] The statistical value of the test sample is adopted, and the burning cone dropping tendency of the test sample is evaluated according to the comparison interval in Table A.2.

[0139] Table 3.4 Evaluation Table for the Burning Cone Dropping Tendency of Slim Cigarettes

[0140]

[0141] According to Tables 3.3 and 3.4, it can be obtained that when using YC / T 558 to evaluate Sample Group 1 and Sample Group 2, Sample Group 1 is unqualified and Sample Group 2 is qualified. When using the ratio method of this application to evaluate the two groups of samples, both are unqualified. From the perspective of the deviation angle of the burning cones of the two groups of samples, the deviation angles of the test samples are relatively large, which affects the consumption experience. It can be seen that using the ratio method of this application to evaluate the burning cone dropping tendency of sample cigarettes can more accurately characterize the qualified degree of the samples during the consumption experience.

Claims

1. A method for evaluating the tendency of a cigarette burning cone to drop its head, characterized in that, Use a manipulator simulation device to simulate the puffing of cigarettes, measure the maximum deviation of the cigarette burning cone, and then evaluate the tipping tendency of the cigarette burning cone using the maximum deviation of the cigarette burning cone; The manipulator simulation device includes a control system, a manipulator, a camera system, a lighting system, and a cigarette lighting system; The control system is respectively connected to the manipulator, the camera system, the lighting system, and the cigarette lighting system, and is used to control the movement of the manipulator and the operation of the camera system, the lighting system, and the cigarette lighting system. It is also used to collect and process the pictures taken by the camera system to obtain the maximum deviation of the cigarette burning cone; there are multiple cameras in the camera system; The method for evaluating the tipping tendency of the cigarette burning cone includes the following steps: Step (1), clamp the cigarette to be tested with a manipulator, and make the axial direction of the cigarette at the clamping position perpendicular to the camera of the camera system and the light source of the lighting system; start the camera system and the lighting system through the control system. Step (2), start the manipulator and the cigarette lighting system through the control system. The manipulator and the cigarette lighting system cooperate to simulate the human cigarette lighting action. After lighting the cigarette to be tested, the manipulator starts to perform suction, swing the arm and turn the wrist, hold the cigarette on the desk, and flick the ash actions according to the cigarette puffing path of the human body simulation. The camera system performs real-time image acquisition on the burning cone after the cigarette flicks the ash. Step (3), when the cigarette burns to the position of the cigarette butt length, end the test; Step (4), process all the burning cone images collected by the camera system to determine the maximum deviation of the cigarette burning cone in the cigarette burning cone deviation image; Step (5), calculate the over-deviation ratio of the cigarette burning cone through the maximum deviation of the cigarette burning cone: For regular cigarettes, the over-deviation ratio of the cigarette burning cone of this batch of cigarettes is: the number of cigarettes with a maximum deviation of the cigarette burning cone greater than 20 degrees / the total number of cigarettes in this batch; For medium-sized cigarettes, the over-deviation ratio of the cigarette burning cone of this batch of cigarettes is: the number of cigarettes with a maximum deviation of the cigarette burning cone greater than 15 degrees / the total number of cigarettes in this batch; For slender cigarettes, the over-deviation ratio of the cigarette burning cone of this batch of cigarettes is: the number of cigarettes with a maximum deviation of the cigarette burning cone greater than 20 degrees / the total number of cigarettes in this batch; Step (6), evaluate the tipping tendency of the cigarette burning cone according to the following criteria through the over-deviation ratio of the cigarette burning cone; If the over-deviation ratio of the cigarette burning cone of this batch of cigarettes is greater than 10%, it is determined that: the tipping tendency of the cigarette burning cone of this batch of cigarettes is high, and the tipping quality of the cigarette burning cone of this batch of cigarettes is unqualified; If the over-deviation ratio of the cigarette burning cone of this batch of cigarettes is less than or equal to 10%, it is determined that: the tipping tendency of the cigarette burning cone of this batch of cigarettes is low, and the tipping quality of the cigarette burning cone of this batch of cigarettes is qualified.

2. The method for evaluating the tipping tendency of a cigarette burning cone according to claim 1, characterized in that, The calculation method of the maximum deviation of the cigarette burning cone is: in the burning cone image obtained in step (2), mark the intersection point of the carbon line of the burning cone and the cigarette axis as point A, and mark the farthest endpoint of the burning cone extending in the direction parallel to the cigarette axis as the vertex of the burning cone, also marked as point P; Then the included angle between the straight line formed by connecting point A and point P and the cigarette axis is the deviation of the cigarette burning cone; Among the several burning cone images of the cigarette, the maximum value of the deviation of the cigarette burning cone is the maximum deviation of the cigarette burning cone of this cigarette.

3. The method for evaluating the tendency of a cigarette burning cone to drop its head according to claim 1, characterized in that, First, compare and obtain the maximum deviation of the cigarette burning cone in the burning cone images captured by different cameras at the same time; Then, compare the maximum deviation of the cigarette burning cone after each cigarette butt tapping, and obtain the maximum deviation of the cigarette burning cone during the whole cigarette suction process.

4. The method for evaluating the tipping tendency of a cigarette combustion cone according to claim 1, wherein When simulating the human cigarette suction action, the ISO, FTC, Massachusetts or Canadian deep suction mode is adopted; among them, the ISO, FTC, Massachusetts or Canadian deep suction frequencies are to suck once every 60 s, 60 s, 30 s, 30 s respectively.

5. The method for evaluating the tipping tendency of a cigarette combustion cone according to claim 1, characterized in that, There are 3 cameras, which are symmetrically arranged centered on the cigarette; there are 3 light sources, which are symmetrically arranged centered on the cigarette.

6. The method for evaluating the tipping tendency of a cigarette combustion cone according to claim 1, characterized in that, The image acquisition system automatically acquires images for processing once every 2 s.

7. The method for evaluating the tipping tendency of a cigarette burning cone according to claim 1, wherein The size of the camera photosensitive element is ≥15 mm, and the pixel size is ≥1.22 μm × 1.22 μm; the color temperature of the light source is ≥4500 K.

8. The method for evaluating the tipping tendency of a cigarette burning cone according to claim 1, characterized in that, In the process of processing the cigarette acquisition image in step (3), the method of scanning pixel by pixel is adopted to find the vertex of the cigarette burning cone, which specifically includes the following steps: (1) Collect the cigarette burning image. After binarizing the image, the gray values Gray of the cigarette and the background will be divided into 255 and 0; (2) According to the position of the cigarette, use ROI to crop the image, and obtain the resolution of the cropped image as x·y; (3) Starting from the upper right endpoint (x, 0) of the image, scan row by row and column by column from right to left and from top to bottom, and find the first pixel point with a gray value Gray = 255 from the background row and column pixels (x i , y i ). The coordinates of this pixel point are the vertex coordinates of the cigarette burning cone.

9. The method for evaluating the tipping tendency of a cigarette combustion cone according to claim 1, characterized in that, The conventional cigarette has a circumference of 22.50 mm to 26.00 mm, the medium cigarette has a circumference of 18.0 mm to 22.50 mm, and the thin cigarette has a circumference of 16.0 mm to 18.0 mm; The above numerical ranges all include the minimum value and do not include the maximum value.

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