A method of measuring the draw resistance of a cigarette

Abstract

This invention relates to a method for measuring the draw resistance of cigarettes, comprising the following steps: Step S100: Connect a differential pressure gauge to the airflow pipeline of a draw resistance measuring instrument, and then measure a standard rod using the differential pressure gauge to obtain the measured draw resistance value of the standard rod. The accuracy of the draw resistance measuring instrument is obtained by calculating the measured draw resistance value and the actual draw resistance value of the standard rod, to determine whether the accuracy is within a set range; Step S200: When the accuracy value exceeds the set range, the draw resistance measuring instrument enters a maintenance process; Step S400: Remove the differential pressure gauge, use the draw resistance measuring instrument to measure the standard rod, and calibrate the draw resistance measuring instrument according to the actual draw resistance value; Step S500: Use the draw resistance measuring instrument to measure the finished cigarette. This method calibrates both the hardware and software control components of the draw resistance measuring instrument, improving the accuracy of the draw resistance measuring instrument in measuring cigarettes and enhancing quality control judgment during cigarette production.

Description

Technical Field

[0001] This invention relates to the field of cigarette manufacturing equipment technology, and in particular to a method for measuring the draw resistance of cigarettes. Background Technology

[0002] When a consumer smokes a cigarette, a certain negative pressure is generated between the inhalation end of the cigarette and the atmosphere. This pressure is the resistance to inhalation, or simply the draw resistance. The draw resistance value can be obtained by measuring the pressure at the inhalation end of the cigarette.

[0003] The draw resistance value directly affects how easy or difficult it is for consumers to smoke a cigarette, their experience, and their satisfaction. Therefore, from the perspective of cigarette production quality control, the draw resistance value of a cigarette is a very important testing item.

[0004] Currently, companies typically use resistance measuring instruments to measure the resistance of cigarettes. However, during use, certain factors, such as mechanical vibration, poor pipeline flow, and software control issues, can lead to low accuracy in measuring cigarette resistance (accuracy is calculated as: instrument's measured resistance value P1, actual resistance value of the measured object P2, (P1-P2)) / P2*100%). This affects quality control judgment during cigarette production, resulting in some substandard cigarettes entering the market. Summary of the Invention

[0005] The purpose of this invention is to provide a method for measuring the inhalation resistance of a cigarette, which is simple to operate and can improve the accuracy of cigarette inhalation resistance measurement.

[0006] To achieve this objective, the embodiments of the present invention adopt the following technical solutions:

[0007] A method for measuring the inhalation resistance of a cigarette is provided, comprising an inhalation resistance measuring instrument, a differential pressure gauge, and a standard rod, and including the following steps:

[0008] Step S100: Connect the differential pressure gauge to the airflow pipeline of the suction resistance measuring instrument, and then measure the standard rod through the differential pressure gauge to obtain the measured suction resistance value of the standard rod. Calculate the accuracy of the suction resistance measuring instrument by comparing the measured suction resistance value with the actual suction resistance value of the standard rod, and determine whether the accuracy is within the set range.

[0009] Step S200: When the accuracy value exceeds the set range, the suction resistance measuring instrument enters the maintenance process.

[0010] Step S300: After the suction resistance measuring instrument completes the maintenance process, the accuracy of the suction resistance measuring instrument is measured in the manner of step S100 until the accuracy is within the set range.

[0011] Step S400: Remove the differential pressure gauge, use the suction resistance measuring instrument to measure the standard rod, and calibrate the suction resistance measuring instrument according to the actual suction resistance value;

[0012] Step S500: Use the suction resistance measuring instrument to measure the finished cigarette.

[0013] As a preferred embodiment of a cigarette draw resistance measurement method, a further step S100' is set before step S100: within the draw resistance measurement range of the draw resistance measuring instrument, two standard rods with different actual draw resistance values ​​are selected. The draw resistance measuring instrument measures the two standard rods for preliminary testing and reads the displayed measurement value of the draw resistance measuring instrument. When the difference between at least one of the displayed measurement values ​​of the two standard rods and the actual draw resistance value is greater than the allowable tolerance, the process proceeds to step S100; when the difference between the displayed measurement values ​​of the two standard rods and the actual draw resistance value is less than the allowable tolerance, the process proceeds to step S500.

[0014] As a preferred embodiment of a cigarette draw resistance measurement method, the maintenance procedure includes the following steps:

[0015] Step S210: Remove the constant current source from the suction resistance measuring instrument;

[0016] Step S220: Clean the removed constant current source;

[0017] Step S230: Assemble the cleaned constant current source onto the suction resistance measuring instrument.

[0018] As a preferred embodiment of a cigarette draw resistance measurement method, step S220 involves immersing the constant current source in alcohol and cleaning it with ultrasonic waves.

[0019] As a preferred embodiment of a cigarette draw resistance measurement method, the outer surface of the constant current source is ensured to be free of scratches before the constant current source is assembled into the draw resistance measuring instrument.

[0020] In a preferred embodiment of a method for measuring the inhalation resistance of a cigarette, the alcohol concentration is 95%.

[0021] As a preferred method for measuring the inhalation resistance of a cigarette, the ultrasonic wave cleans the constant current source for 10-20 minutes.

[0022] As a preferred embodiment of a cigarette draw resistance measurement method, the draw resistance measuring instrument includes a base, a measuring head, and a sealing block. The measuring head is disposed on the base, and the sealing block is movably disposed on the base. The measuring head is provided with a detection cavity for placing the cigarette. The bottom of the measuring head is provided with a smoke exhaust port communicating with the detection cavity, and the sealing block can seal the smoke exhaust port.

[0023] The maintenance procedure includes adjusting the position between the sealing block and the exhaust port to ensure that the sealing block can seal the exhaust port.

[0024] As a preferred embodiment of a cigarette draw resistance measurement method, in step S100, within the measurement range of the differential pressure gauge, multiple standard rods with different actual draw resistance values ​​are selected, and the differential pressure gauge measures each of the standard rods one by one. When the accuracy of the differential pressure gauge in measuring all the standard rods is within the set range, the process proceeds to step S400.

[0025] As a preferred embodiment of a method for measuring the inhalation resistance of a cigarette, the inhalation resistance measuring instrument has a measurement range of 0-15000 Pa.

[0026] The beneficial effects of this invention are as follows: the method for measuring the draw resistance of a cigarette calibrates both the hardware and software control components of the draw resistance measuring instrument. Firstly, by directly connecting a differential pressure gauge to the airflow path of the draw resistance measuring instrument, the influence of the software control component on the measurement is eliminated. By directly testing the pressure value of the airflow path using the differential pressure gauge, the draw resistance value of the measured object can be measured more accurately. Then, by calculating the difference between the measured and actual suction resistance values, the accuracy of the suction resistance measuring instrument is determined. If the accuracy of the instrument exceeds the set range, it can be directly sent for maintenance. After maintenance, the instrument is tested again using a differential pressure gauge until the accuracy of the hardware is within the set range. Then, the differential pressure gauge is removed, and the suction resistance measuring instrument is used directly to measure a standard rod to obtain the displayed measurement value. The actual suction resistance value of the standard rod is then used to calibrate the instrument's displayed value, thus resolving the software control issue and obtaining a suction nozzle measuring instrument that meets accuracy requirements. This instrument is then used to measure finished cigarettes, demonstrating high accuracy and improving quality control during cigarette production, thereby reducing the number of defective cigarettes entering the market. Attached Figure Description

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0028] Figure 1 This is a flowchart of a cigarette draw resistance measurement method according to an embodiment of the present invention.

[0029] Figure 2 This is a flowchart of the maintenance process according to an embodiment of the present invention. Detailed Implementation

[0030] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] When a consumer smokes a cigarette, a certain negative pressure is generated between the inhalation end of the cigarette and the atmosphere. This pressure is the resistance to inhalation, or simply the draw resistance. The draw resistance value can be obtained by measuring the pressure at the inhalation end of the cigarette.

[0034] The draw resistance value directly affects how easy or difficult it is for consumers to smoke a cigarette, their experience, and their satisfaction. Therefore, from the perspective of cigarette production quality control, the draw resistance value of a cigarette is a very important testing item.

[0035] Currently, companies typically use a resistance meter to measure the resistance value of cigarettes. However, during use, certain factors, such as mechanical vibration or poor pipeline flow, can cause the resistance meter to have low accuracy in measuring cigarettes. This affects the quality control judgment during cigarette production, and consequently, some unqualified cigarettes enter the market.

[0036] To solve the above technical problems, such as Figure 1As shown, this invention discloses a method for measuring the inhalation resistance of a cigarette, providing an inhalation resistance measuring instrument, a differential pressure gauge, and a standard rod.

[0037] A suction resistance measurement instrument is an instrument that can simulate the action of a person smoking and continuously inhale a fixed flow of air to test the suction resistance value of a cigarette. It includes a base and a flow generation device. A measuring head is set on the base, and the measuring head is equipped with a detection chamber. The test piece can be placed in the detection chamber. The detection chamber is connected to the flow generation device through an airflow pipe. The flow generation device can draw gas into the detection chamber through the airflow pipe to form a pressure difference.

[0038] The method for measuring the draw resistance of a cigarette includes the following steps:

[0039] Step S100: Connect the differential pressure gauge to the airflow pipeline of the suction resistance measuring instrument, and then measure the standard rod through the differential pressure gauge to obtain the measured suction resistance value of the standard rod. Calculate the accuracy of the suction resistance measuring instrument by comparing the measured suction resistance value with the actual suction resistance value of the standard rod, and determine whether the accuracy is within the set range.

[0040] Step S200: When the accuracy value exceeds the set range, the suction resistance measuring instrument enters the maintenance process.

[0041] After the suction resistance measuring instrument completes the maintenance process in step S300, the accuracy of the suction resistance measuring instrument is measured in the manner described in step S100 until the accuracy is within the set range.

[0042] Step S400: Remove the differential pressure gauge, use the suction resistance measuring instrument to measure the standard rod, and calibrate the suction resistance measuring instrument according to the actual suction resistance value;

[0043] Step S500: Remove the differential pressure gauge and use a suction resistance measuring instrument to measure the finished cigarette.

[0044] In this invention, the method for measuring the draw resistance of a cigarette calibrates both the hardware and software control components of the draw resistance measuring instrument. Firstly, a differential pressure gauge is directly connected to the airflow path of the draw resistance measuring instrument. This step eliminates the influence of the software control component on the measurement, allowing for direct testing of the pressure value in the airflow path via the differential pressure gauge, thus enabling a more accurate measurement of the draw resistance of the tested substance. Then, by calculating the difference between the measured and actual resistance values, the accuracy of the resistance measuring instrument is determined. If the accuracy of the resistance measuring instrument exceeds the set range, it can be directly sent to the maintenance process. After maintenance, the resistance measuring instrument can be tested again using a differential pressure gauge until the accuracy of the hardware part of the resistance measuring instrument does not exceed the set range. Then, the differential pressure gauge is removed, and the resistance measuring instrument is used again to measure the standard rod to obtain the displayed measurement value of the resistance measuring instrument. The displayed measurement value of the resistance measuring instrument is calibrated using the actual resistance value of the standard rod, thereby solving the problem of the software control part of the resistance measuring instrument and obtaining a resistance measuring instrument that meets the accuracy requirements. Then, the resistance measuring instrument is used to measure the finished cigarettes. Its accuracy in measuring cigarettes is high, which improves the quality control judgment during the production of cigarettes and reduces the number of defective cigarettes entering the market. Understandably, step S400 primarily addresses the impact of the suction resistance measuring instrument's software control on accuracy. After measuring the standard bar, the instrument measures a value, which is then displayed. If the software control of the suction resistance measuring instrument malfunctions, the displayed value will differ significantly from the actual suction resistance value. In this case, the instrument needs to be calibrated. The instrument has a control board that can be used for adjustments to align the displayed suction resistance value with the actual vertical value, or to bring it within the tolerance range.

[0045] It should be noted that the accuracy calculation method is: the instrument's measured suction resistance value P1, the cigarette's actual suction resistance value P2, and (P1-P2) / P2*100%. Here, the instrument can refer to a differential pressure gauge or a suction resistance measuring instrument. In step S100, P1 represents the measured suction resistance value of the standard rod measured by the differential pressure gauge. The set range is ±1%, therefore, an accuracy within ±1% meets the accuracy requirements. The standard rod is a standardized calibration rod, each with a nominal suction resistance value, which is the actual suction resistance value. After the differential pressure gauge is connected to the airflow pipeline, the standard rod remains inside the measuring head for measurement. Simultaneously, the flow generator draws air, creating a negative pressure between the airflow pipeline and the atmosphere. The differential pressure gauge then directly measures the pressure value of the airflow pipeline, thus obtaining the measured suction resistance value of the standard rod.

[0046] In enterprises, there are many suction resistance measuring instruments. Connecting each instrument to a differential pressure gauge for testing would be inefficient. To improve efficiency, within the suction resistance measurement range of the measuring instrument, two standard rods with different actual suction resistance values ​​are selected. The measuring instrument measures both standard rods for preliminary testing, and the displayed measurement value is read. When the difference between at least one of the displayed measurement values ​​of the two standard rods and the actual suction resistance value is greater than the allowable tolerance, the process proceeds to step S100; when the differences between the displayed measurement values ​​of both standard rods and the actual suction resistance value are both less than the allowable tolerance, the process proceeds to step S500. This eliminates the need to connect a differential pressure gauge to the airflow line of the suction resistance measuring instrument for further testing, simplifying the complex operation of connecting the differential pressure gauge to the airflow line. It should be noted that the allowable tolerance refers to the permissible error range. The tolerance for each standard bar is different. In this embodiment, the tolerance range is ±1%. For example, when the actual absorption resistance of the standard bar is 500 Pa, the allowable error range is ±5 Pa; when the actual absorption resistance of the standard bar is 1000 Pa, the allowable error range is ±10 Pa.

[0047] Specifically, such as Figure 2 As shown, the maintenance process also includes the following steps;

[0048] Step S210: Remove the constant current source from the suction resistance measuring instrument;

[0049] Step S220: Clean the removed constant current source;

[0050] Step S230: Assemble the cleaned constant current source onto the absorption resistance measuring instrument;

[0051] A constant current source is positioned between the airflow pipeline and the flow generator to control the total airflow rate of the airflow pipeline at 17.5 mL / s. During maintenance, the constant current source is removed and cleaned to remove impurities and prevent blockage, thereby reducing its impact on the measurement data and improving the accuracy of the draw resistance meter in measuring cigarette draw resistance.

[0052] Further, in step S220: the constant current source is immersed in alcohol and then cleaned using ultrasound. Alcohol can dissolve grease and impurities adhering to the surface of the constant current source. While the constant current source is immersed in alcohol, it is cleaned using ultrasound. Ultrasound can clean the surface of the constant current source thoroughly, resulting in a good cleaning effect. Furthermore, after the constant current source is removed from the alcohol, the alcohol evaporates automatically and will not corrode the constant current source.

[0053] Furthermore, the alcohol concentration is 95%, also known as anhydrous alcohol, which has a good cleaning effect on instruments.

[0054] Optionally, the constant current source can be cleaned with ultrasound for 10-20 minutes to ensure that the ultrasound can effectively clean the constant current source.

[0055] In a preferred embodiment, the constant current source is placed in 95% alcohol and ultrasonically cleaned for 15 minutes to achieve a good cleaning effect. After cleaning, the constant current source is removed from the alcohol and allowed to evaporate before being reassembled onto the absorption resistance measuring instrument.

[0056] For example, several cleaning methods were used for the constant current source:

[0057] The first method involves repeatedly passing a thin, soft steel wire through the constant current source's orifice to clean and polish it. After cleaning using this method, the constant current source is reassembled into the absorption resistance measuring instrument. The accuracy of the absorption resistance measuring instrument is then measured to be 5.5%.

[0058] The second method: Place the constant current source in 95% alcohol and clean it with ultrasound for 15 minutes. After cleaning by this method, reassemble the constant current source into the absorption resistance measuring instrument, and then measure the accuracy of the absorption resistance measuring instrument. The accuracy is 0.05%.

[0059] The third method: Soak the constant current source in 5% acetone and use ultrasonic cleaning for 15 minutes. After cleaning by this method, the constant current source is reassembled into the absorption resistance measuring instrument, and then the accuracy of the absorption resistance measuring instrument is measured to be 3.6%.

[0060] It is evident that the first and second methods are ineffective in cleaning the constant current source. When the cleaned constant current source is assembled into the absorption resistance measuring instrument, the accuracy of the instrument does not meet the requirements. The second method, namely the invented solution, provides the best cleaning effect for the constant current source, and the accuracy of the absorption resistance measuring instrument after cleaning is within the set range.

[0061] Furthermore, before assembling the constant current source into the absorption resistance measuring instrument, ensure that the outer surface of the constant current source is free of scratches to prevent damage during cleaning. During inspection, specifically check for any damage to the appearance of the constant current source, whether its sealing ring is intact, and whether light can pass through the constant current source hole light source at the bottom. If all are in good condition, the constant current source can be considered undamaged.

[0062] In some embodiments, the suction resistance measuring instrument includes a base, a measuring head, and a sealing block. The measuring head is mounted on the base, and the sealing block is movably mounted on the base. The measuring head has a detection chamber for holding a cigarette. The bottom of the measuring head has a smoke exhaust port communicating with the detection chamber, and the sealing block can seal the smoke exhaust port. The maintenance procedure includes adjusting the position between the sealing block and the smoke exhaust port to ensure that the sealing block can seal the smoke exhaust port. It is understood that the sealing block is connected to a driving mechanism, which can drive the sealing block to seal inside the smoke exhaust port, thus sealing the detection chamber. When the differential pressure gauge indicates that the accuracy of the suction resistance measuring instrument exceeds the set range, the position of the sealing block and the smoke exhaust port can be adjusted to ensure that the sealing block can completely seal the smoke exhaust port.

[0063] Optionally, a rubber layer is provided on the sealing block. When the drive mechanism drives the sealing block to move toward the exhaust port, the rubber layer can make close contact with the periphery of the exhaust port to prevent gas leakage in the detection chamber.

[0064] In one embodiment, in step S100, within the absorption resistance measurement range of the absorption resistance measuring instrument, multiple standard bars with different actual absorption resistance values ​​are selected. The differential pressure gauge measures each of the standard bars one by one. When the accuracy of the differential pressure gauge in measuring all the standard bars is within the set range, the process proceeds to step S400. The differential pressure gauge improves the accuracy of the measurement by measuring multiple measurement points.

[0065] Optionally, the absorption resistance measuring instrument has a measurement range of 0-15000 Pa. This instrument can measure a wide range of absorption resistance values ​​and is applicable to a wide range of scenarios. Of course, in other embodiments, the maximum measurement value of the absorption resistance measuring instrument can also be 10000 Pa, 12000 Pa, or 18000 Pa, and is not limited to this embodiment.

[0066] Furthermore, a line graph is constructed based on the actual and measured draw resistance values. A broken line is fitted using the actual draw resistance value of each standard rod as the independent variable and the measured draw resistance value from each differential pressure gauge as the dependent variable. The accuracy of the draw resistance measuring instrument is judged based on the linearity of the broken line, making the judgment more intuitive and efficient. Standard rods with actual draw resistance values ​​of 1000 Pa, 2000 Pa, and 3000 Pa are selected, with an input point of 0 (no standard rod or cigarette placed in the detection chamber). The standard rod with an actual draw resistance value of 2000 Pa exhibits a large bend, indicating poor linearity. Therefore, a preliminary judgment can be made that the draw resistance measuring instrument does not meet the requirements. Further accuracy calculations are then used for a final judgment.

[0067] In the description herein, it should be understood that the terms "upper" and "lower," etc., refer to the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0068] In the description of this specification, references to terms such as "an embodiment" indicate that a specific feature, structure, material, or characteristic associated with that embodiment is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment.

[0069] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0070] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of the invention and should not be construed as limiting the scope of protection of the invention in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of the invention without inventive effort, and these embodiments will all fall within the scope of protection of the present invention.

Claims

1. A method for measuring the draw resistance of a cigarette, characterized in that, A suction resistance measuring instrument, a differential pressure gauge, and a standard rod are provided. The suction resistance measuring instrument includes a constant flow source disposed between the gas flow pipeline and the flow generation device. The constant flow source is used to control the total gas flow rate of the gas flow pipeline to a constant state of 17.5 mL / s. The method includes the following steps: Step S100: Connect the differential pressure gauge to the airflow pipeline of the suction resistance measuring instrument, and then measure the standard rod through the differential pressure gauge to obtain the measured suction resistance value of the standard rod. Calculate the accuracy of the suction resistance measuring instrument by comparing the measured suction resistance value with the actual suction resistance value of the standard rod, and determine whether the accuracy is within the set range. Step S200: When the accuracy value exceeds the set range, the suction resistance measuring instrument enters the maintenance process. The maintenance procedure includes the following steps: Step S210: Remove the constant current source from the suction resistance measuring instrument; Step S220: Clean the removed constant current source; Step S230: Assemble the cleaned constant current source onto the suction resistance measuring instrument; Step S300: After the suction resistance measuring instrument completes the maintenance process, the accuracy of the suction resistance measuring instrument is measured in the manner of step S100 until the accuracy is within the set range. Step S400: Remove the differential pressure gauge, use the suction resistance measuring instrument to measure the standard rod, and calibrate the suction resistance measuring instrument according to the actual suction resistance value; Step S500: Use the suction resistance measuring instrument to measure the finished cigarette.

2. The method for measuring the inhalation resistance of a cigarette according to claim 1, characterized in that, Before step S100, step S100' is set: within the absorption resistance measurement range of the absorption resistance measuring instrument, two standard bars with different actual absorption resistance values ​​are selected. The absorption resistance measuring instrument measures the two standard bars for preliminary testing and reads the displayed measurement value of the absorption resistance measuring instrument. When the difference between at least one of the displayed measurement values ​​of the two standard bars and the actual absorption resistance value is greater than the tolerance, the process proceeds to step S100; when the difference between the displayed measurement values ​​of the two standard bars and the actual absorption resistance value is less than the tolerance, the process proceeds to step S500.

3. The method for measuring the inhalation resistance of a cigarette according to claim 1, characterized in that, Step S220: Immerse the constant current source in alcohol and clean it with ultrasound.

4. The method for measuring the inhalation resistance of a cigarette according to claim 1, characterized in that, Before assembling the constant current source into the suction resistance measuring instrument, ensure that the outer surface of the constant current source is free from scratches.

5. The method for measuring the inhalation resistance of a cigarette according to claim 3, characterized in that, The alcohol concentration is 95%.

6. The method for measuring the inhalation resistance of a cigarette according to claim 3, characterized in that, The ultrasonic waves clean the constant current source for 10-20 minutes.

7. The method for measuring the inhalation resistance of a cigarette according to claim 1, characterized in that, The suction resistance measuring instrument includes a base, a measuring head, and a sealing block. The measuring head is disposed on the base, and the sealing block is movably disposed on the base. The measuring head is provided with a detection cavity for placing the cigarette stick. The bottom of the measuring head is provided with a smoke exhaust port communicating with the detection cavity, and the sealing block can seal the smoke exhaust port. The maintenance procedure includes adjusting the position between the sealing block and the exhaust port to ensure that the sealing block can seal the exhaust port.

8. A method for measuring the inhalation resistance of a cigarette according to any one of claims 1 to 7, characterized in that, In step S100, within the measurement range of the differential pressure gauge, multiple standard bars with different actual absorption resistance values ​​are selected. The differential pressure gauge measures each of the standard bars one by one. When the accuracy of the differential pressure gauge in measuring all the standard bars is within the set range, the process proceeds to step S400.

9. The method for measuring the draw resistance of a cigarette according to claim 8, characterized in that, The absorption resistance measuring instrument has a measurement range of 0-15000Pa.

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