CN110595979A - Constant flow based dynamic filter tip ventilation rate detection method - Google Patents
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- 238000009423 ventilation Methods 0.000 title claims abstract description 86
- 238000001514 detection method Methods 0.000 title claims abstract description 66
- 235000019504 cigarettes Nutrition 0.000 claims abstract description 141
- 238000002485 combustion reaction Methods 0.000 claims abstract description 29
- 238000000605 extraction Methods 0.000 claims abstract description 11
- 230000007246 mechanism Effects 0.000 claims description 50
- 238000000034 method Methods 0.000 claims description 9
- 238000012937 correction Methods 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 3
- 230000000391 smoking effect Effects 0.000 abstract description 5
- 230000002349 favourable effect Effects 0.000 abstract description 4
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 241000208125 Nicotiana Species 0.000 description 2
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000004816 latex Substances 0.000 description 2
- 229920000126 latex Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- SNICXCGAKADSCV-JTQLQIEISA-N (-)-Nicotine Chemical compound CN1CCC[C@H]1C1=CC=CN=C1 SNICXCGAKADSCV-JTQLQIEISA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229960002715 nicotine Drugs 0.000 description 1
- SNICXCGAKADSCV-UHFFFAOYSA-N nicotine Natural products CN1CCCC1C1=CC=CN=C1 SNICXCGAKADSCV-UHFFFAOYSA-N 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/0806—Details, e.g. sample holders, mounting samples for testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
- G01N7/10—Analysing materials by measuring the pressure or volume of a gas or vapour by allowing diffusion of components through a porous wall and measuring a pressure or volume difference
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N2015/084—Testing filters
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- Cigarettes, Filters, And Manufacturing Of Filters (AREA)
Abstract
The invention discloses a constant flow based dynamic filter tip ventilation rate detection method, which comprises the following steps: fixing the cigarette to be tested on the sleeve, and enabling the filter tip of the cigarette to be tested to be completely positioned in the sleeve; igniting the cigarette to be tested; performing air extraction operation on the sleeve at a constant flow rate, and acquiring a distance d between a combustion line of the cigarette and one end, far away from the combustion line, of the filter tip; obtaining the ventilation Q of the cigarette filterd(ii) a Calculating the ventilation rate Q of the cigarette filter when the distance between the combustion line of the cigarette and the end of the filter far away from the combustion line is ddAnd/q. The dynamic filter tip ventilation rate detection method based on the constant flow obtains dynamic monitoring detection of the cigarette filter tip ventilation rate changing along with the burning line of the cigarette by sucking the cigarette and obtaining the distance d between the burning line of the cigarette and the end, far away from the burning line, of the filter tip, and is favorable for more accurately evaluating the real influence of the filter tip ventilation rate on smoking experience.
Description
Technical Field
The invention relates to the field of filter ventilation rate, in particular to a constant flow-based dynamic filter ventilation rate detection method.
Background
The filter tip ventilation technology is one of tar and harm reducing measures commonly adopted by cigarette enterprises at home and abroad. The ventilation rate of the cigarette filter is closely related to the sensory quality of cigarettes, and the release amount of main stream smoke such as tar, nicotine, carbon monoxide and the like is directly influenced.
The existing filter tip ventilation rate detection method is obtained by adopting a ventilation rate unit of a comprehensive test bench for the physical properties of cigarettes and filter sticks under the condition that the cigarettes are not ignited. However, in the burning process of the cigarette, complex high-temperature pyrolysis chemical reactions exist, and as the length of the cigarette burning is gradually shortened, the ventilation rate of the cigarette filter is influenced by the variable factors. The result obtained by the conventional filter tip ventilation rate detection method cannot reflect the dynamic change in the cigarette burning and smoking process, and the real influence of the filter tip ventilation rate on smoking experience cannot be accurately evaluated.
Therefore, how to provide a method capable of detecting the dynamic change of the ventilation rate of the cigarette filter becomes a technical problem which needs to be solved urgently in the field.
Disclosure of Invention
The invention aims to provide a novel technical scheme of a constant-flow-based dynamic filter ventilation rate detection method capable of detecting dynamic changes of cigarette filter ventilation rates.
According to a first aspect of the invention, a constant flow based dynamic filter ventilation rate detection method is provided.
The method for detecting the ventilation rate of the dynamic filter tip based on the constant flow comprises the following steps:
(1) fixing the cigarette to be tested on the sleeve, and enabling the filter tip of the cigarette to be tested to be completely positioned in the sleeve;
(2) igniting the cigarette to be tested;
(3) performing air extraction operation on the sleeve at a constant flow rate, and acquiring a distance d between a combustion line of the cigarette and one end, far away from the combustion line, of the filter tip;
(4) obtaining the ventilation Q of the cigarette filterd；
(5) Calculating the ventilation rate Q of the cigarette filter when the distance between the combustion line of the cigarette and the end of the filter far away from the combustion line is dd/q。
Optionally, the step (1) is specifically as follows:
(1-1) inserting the cigarette to be tested into the sleeve, so that the filter tip of the cigarette to be tested is completely positioned in the sleeve, and the combustion part of the cigarette to be tested is completely positioned outside the sleeve;
and (1-2) clamping the joint of the filter tip and the combustion part of the cigarette to be tested through a first flexible sleeve capable of being filled with air so as to fix the cigarette to be tested in the sleeve.
Optionally, the step (1) further includes:
and (1-3) sealing the gap between the cigarette to be tested and the suction side of the sleeve through a second flexible sleeve capable of being filled with air.
Optionally, the step (1) further includes:
and (1-4) performing air suction operation on the sleeve at a constant flow rate until the suction air flow is stable.
Optionally, the constant flow rate in the step (3) is 17.5 mL/s.
Optionally, the air flow direction during the air extraction operation in the step (3) is collinear with the central axis of the cigarette to be tested.
Optionally, the cigarette filter ventilation Q in the step (4)dBy flow rate test mounted on the sleeveAnd (6) obtaining by a measuring mechanism.
Optionally, the flow direction of the air flowing to the flow rate detection mechanism in the step (4) is perpendicular to the flow direction of the air during the air exhaust operation.
Optionally, the step (5) is specifically as follows:
calculating ventilation rate kQ of cigarette filter tip when distance between combustion line of cigarette and end of filter tip far from combustion line is ddAnd/q, wherein k is a ventilation rate correction coefficient, and k is 0.01-0.03.
Optionally, the ventilation rate correction factor in the step (5)Wherein P is atmospheric pressure, PdIs the difference between the pressure on the suction side of the sleeve and atmospheric pressure.
The dynamic filter tip ventilation rate detection method based on the constant flow obtains dynamic monitoring detection of the cigarette filter tip ventilation rate changing along with the burning line of the cigarette by sucking the cigarette and obtaining the distance d between the burning line of the cigarette and the end, far away from the burning line, of the filter tip, and is favorable for more accurately evaluating the real influence of the filter tip ventilation rate on smoking experience.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a flow chart of an embodiment of a constant flow based dynamic filter ventilation rate detection method of the present disclosure.
Fig. 2 is a schematic structural diagram of an apparatus for implementing the constant flow based dynamic filter ventilation rate detection method of the present disclosure.
The figures are labeled as follows:
the cigarette burning line detection device comprises a cigarette fixing mechanism-1, a first flexible sleeve-11, a sleeve-12, a cigarette socket-121, a flow detection port-122, a suction port-123, a second flexible sleeve-13, an air suction mechanism-2, a flow detection mechanism-3, a flow control mechanism-4, a cigarette burning line detection mechanism-5, a CCD camera-50, a filter-6, a differential pressure sensor-7, a two-position three-way valve-8, a first inlet-81, a second inlet-82, an outlet-83, a filter assembly-9, a switch valve-91, a filter pressure reducing valve-92 and a cigarette-01.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
As shown in fig. 1, the constant flow-based dynamic filter ventilation rate detection method of the present disclosure includes the steps of:
step (1): the cigarette to be measured is fixed on the sleeve, and the filter tip of the cigarette to be measured is completely positioned in the sleeve. The filter tip of cigarette that awaits measuring is located the sleeve completely and is favorable to improving the detection accuracy of filter tip ventilation rate.
Step (2): and igniting the cigarette to be tested. The ignition of the cigarette to be tested can be realized by the cigarette lighter.
And (3): air exhaust operation is carried out to the sleeve with constant flow to acquire the interval d that burning line one end was kept away from to the burning line of cigarette and filter tip. The above-mentioned air extraction operation can be realized by an air extraction mechanism connected with the sleeve. The burning line of above-mentioned cigarette is kept away from the interval d accessible cigarette burning line detection mechanism of burning line one end with the filter tip and is acquireed.
And (4): obtaining the ventilation Q of the cigarette filterd. The cigarette filter tip ventilation QdCan be obtained by a flow detection mechanism.
And (5): calculating the ventilation rate Q of the cigarette filter when the distance between the combustion line of the cigarette and the end of the filter far away from the combustion line is dd/q。
The dynamic filter tip ventilation rate detection method based on the constant flow obtains dynamic monitoring detection of the cigarette filter tip ventilation rate changing along with the burning line of the cigarette by sucking the cigarette and obtaining the distance d between the burning line of the cigarette and the end, far away from the burning line, of the filter tip, and is favorable for more accurately evaluating the real influence of the filter tip ventilation rate on smoking experience.
The constant flow-based dynamic filter ventilation rate detection method of the present disclosure may be implemented by a constant flow-based dynamic filter ventilation rate detection apparatus. As shown in fig. 2, the device for detecting the ventilation rate of dynamic filter based on constant flow rate may include a cigarette fixing mechanism 1, an air extracting mechanism 2, a flow rate detecting mechanism 3, a flow rate controlling mechanism 4 and a cigarette burning line detecting mechanism 5.
The suction mechanism 2 can be, for example, a suction pump or a vacuum pump or a negative pressure generator or the like. The flow rate detection mechanism 3 may be, for example, a flow rate sensor or a laminar flow meter. The flow control mechanism 4 may be, for example, a solenoid valve or a sonic nozzle. The cigarette burning line detection means 5 may be, for example, a means for acquiring the position of the burning line by taking a picture of the burning of the cigarette, a means for detecting the position of the burning line by a photoelectric sensor, or the like.
In order to ensure a normal and stable operation of the air extraction mechanism 2, the dynamic filter ventilation rate detection device based on a constant flow rate may further comprise a filter assembly 9. The filter assembly 9 includes an on-off valve 91 and a filter relief valve 92. The on-off valve 91 and the filtering and pressure reducing valve 92 are both disposed on a pipeline between the air inlet end of the air exhaust mechanism 2 and the atmosphere, and the on-off valve 91 is far away from the air inlet end of the air exhaust mechanism 2 than the filtering and pressure reducing valve 92. After the switch valve 91 is opened, the air exhaust mechanism 2 can normally work.
The cigarette retaining mechanism 1 includes a sleeve 12. The sleeve 12 is provided with a cigarette insertion opening 121, a flow detection opening 122 and a suction opening 123. The cigarette insertion opening 121 is used for inserting a cigarette 01 into the sleeve 12. The suction mechanism 2 sucks air from the sleeve 12 through the suction port 123. The flow rate detection mechanism 3 is connected to the flow rate detection port 122. The flow control mechanism 4 is used for controlling the flow rate of the air sucked by the air suction mechanism 2 to the sleeve 12 to be a constant flow rate, and the flow control mechanism 4 is arranged between the air suction mechanism 2 and the sleeve 12. The cigarette burning line detection mechanism 5 is used for detecting the position of the burning line of the cigarette 01. The cigarette burning line detecting mechanism 5 may include a CCD camera 50 for taking a burning photograph of the cigarette 01. In specific implementation, the cigarette burning line detection mechanism 5 may further include a processor for processing a picture taken by the CCD camera 50. The position of the combustion line of the cigarette 01 can be obtained by continuously shooting the cigarette 01 by the CCD camera 50.
When the dynamic filter tip ventilation rate detection device based on constant flow is used, a cigarette 01 is firstly inserted into the sleeve 12 from the cigarette inserting opening 121. The suction mechanism 2 then operates to draw air through the sleeve 12 via the suction opening 123, igniting the cigarette 01. Along with the burning of the cigarette 01, the cigarette burning line detection mechanism 5 can continuously obtain the position of the burning line of the cigarette 01, namely the distance d between the burning line of the cigarette 01 and the end part of the cigarette 01 can be obtained, and the flow detection mechanism 3 can detect the ventilation flow Q of the cigarette filterd. Therefore, the cigarette filter ventilation rate Q when the distance between the combustion line of the cigarette 01 and the end part of the cigarette 01 is d can be detected by the dynamic filter ventilation rate detection device based on the constant flowd/q。
In one embodiment of the constant flow based dynamic filter ventilation rate detection method of the present disclosure, in order to improve the accuracy of the dynamic filter ventilation rate detection, the step (1) is specifically as follows:
step (1-1): the cigarette to be tested is inserted into the sleeve, so that the filter tip of the cigarette to be tested is completely positioned in the sleeve, and the combustion part of the cigarette to be tested is completely positioned outside the sleeve. The combustion part is a part of the cigarette wrapped with tobacco shreds, and abuts against the end part of the filter tip part. The placing mode of the cigarette to be tested in the sleeve can effectively avoid the interference of the burning part of the cigarette on the ventilation rate of the filter tip.
Step (1-2): the first flexible sleeve capable of being inflated and exhausted clamps the joint of the filter tip and the burning part of the cigarette to be tested so as to fix the cigarette to be tested in the sleeve. The first flexible sleeve is also beneficial to closing the gap between the sleeve and the cigarette.
The first flexible sleeve 11 may be an integral part of the cigarette retaining mechanism 1 and the first flexible sleeve 11 may be, for example, a latex tube. The first flexible sleeve 11 is a flexible tube which can be inflated or evacuated to effect deformation of the first flexible sleeve 11 by inflation or evacuation to grip or release the cigarette 01 within the sleeve 12.
The air extraction mechanism 2 may be used to inflate and extract air from the first flexible sleeve 11. After the cigarette 01 is inserted into the sleeve 12, the air-extracting mechanism 2 can extract air to the first flexible sleeve 11, so that the first flexible sleeve 11 tightly grips the cigarette 01 and closes the gap between the sleeve 12 and the cigarette 01.
Further, in order to improve the accuracy of the dynamic filter ventilation rate detection, the step (1) further comprises:
step (1-3): and sealing the gap between the cigarette to be tested and the suction side of the sleeve by the second flexible sleeve capable of being filled with air.
The second flexible sleeve 13 may be an integral part of the cigarette retaining mechanism 1 and the second flexible sleeve 13 may be, for example, a latex tube. The second flexible sleeve 13 is a flexible tube that can be inflated or deflated to effect deformation of the second flexible sleeve 13 by inflation or deflation to seal the gap between the suction side of the sleeve 12 and the cigarette 01. The suction side of the sleeve 12 is the side of the sleeve 12 provided with the suction opening 123.
The air extraction mechanism 2 can be used to inflate and extract air from the second flexible sleeve 13. After the cigarette 01 is inserted into the sleeve 12, the air-extracting mechanism 2 can extract air from the second flexible sleeve 13, so that the second flexible sleeve 13 can tightly clamp the cigarette 01 and close the gap between the sleeve 12 and the cigarette 01.
In order to increase the efficiency of use of the first flexible sleeve 11 and the second flexible sleeve 13 for a dynamic filter ventilation rate detection device based on a constant flow rate, the detection device may further comprise a two-position three-way valve 8.
The first inlet 81 of the two-position three-way valve 8 is connected with a pipeline between the air inlet end of the air suction mechanism 2 and the flow control mechanism 4. The second inlet 82 of the two-position three-way valve 8 is connected with a pipeline between the air inlet end of the air exhaust mechanism 2 and the atmosphere. The first flexible sleeve 11 and the second flexible sleeve 13 are both connected to the outlet 83 of the two-position three-way valve 8.
Before the cigarette 01 is inserted into the sleeve 12, the first inlet 81 and the outlet 83 of the two-position three-way valve 8 are communicated, at the moment, the first flexible sleeve 11 and the second flexible sleeve 13 are not deformed or only slightly deformed, and the cigarette 01 can be easily inserted into the sleeve 12. When the cigarette 01 is inserted into the sleeve 12, the second inlet 82 of the two-position three-way valve 8 is communicated with the outlet 83, and at the same time, the first flexible sleeve 11 and the second flexible sleeve 13 are deformed, so that the cigarette 01 is clamped in the sleeve 12.
Furthermore, in order to avoid the problem of inaccurate filter ventilation rate detection caused by unstable extraction airflow, the step (1) further comprises the following steps:
step (1-4): the sleeve is pumped at a constant flow rate until the pumped air flow is stable.
In one embodiment of the constant flow based dynamic filter ventilation rate detection method of the present disclosure, the constant flow in step (3) is 17.5 mL/s. The constant flow is beneficial to more stable combustion of the cigarette, so that the ventilation rate of the dynamic filter tip can be more accurately and efficiently detected.
In one embodiment of the method for detecting the ventilation rate of the dynamic filter based on the constant flow rate, in order to improve the accuracy and the efficiency of detection of the ventilation rate of the dynamic filter, the flow direction of the air flow during the air extraction operation in the step (3) is collinear with the central axis of the cigarette to be detected.
Further, the ventilation Q of the cigarette filter in the step (4)dObtained by a flow detection mechanism arranged on the sleeve. The flow rate detection mechanism 3 may be connected to the flow rate detection port 122 of the sleeve 12.
Furthermore, in order to improve the accuracy of the detection of the ventilation rate of the dynamic filter, the flow direction of the air flowing to the flow rate detection mechanism in the step (4) is perpendicular to the flow direction of the air flowing during the air suction operation.
In one embodiment of the constant flow based dynamic filter ventilation rate detection method of the present disclosure, step (5) is specifically as follows:
calculating ventilation rate kQ of cigarette filter tip when distance between combustion line of cigarette and end of filter tip far from combustion line is ddAnd/q, wherein k is a ventilation rate correction coefficient, and k is 0.01-0.03. The ventilation rate correction factor is beneficial for correcting the filter ventilation rate.
Further, the ventilation rate correction coefficient in the step (5)Wherein P is atmospheric pressure, PdIs the difference between the pressure on the suction side of the sleeve and atmospheric pressure.
For a constant flow based dynamic filter ventilation rate detection device, the detection device may also include a filter 6 and a differential pressure sensor 7. The filter 6 is arranged between the flow control mechanism 4 and the cigarette fixing mechanism 1 to prevent impurities such as tobacco shreds and the like from blocking the flow control mechanism 4. The differential pressure sensor 7 is arranged between the cigarette fixing mechanism 1 and the filter 6, and the differential pressure sensor 7 is used for measuring the difference between the pressure of the pipeline between the cigarette fixing mechanism 1 and the filter 6 and the atmospheric pressure P.
The pressure difference sensor 7 can detect the pressure drop P of the pipeline between the cigarette fixing mechanism 1 and the filter 6d. By pressure drop PdThe filter ventilation rate can be corrected. Specifically, the filter ventilation rate is calculated by the following formula:
although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (10)
1. A method for detecting the ventilation rate of a dynamic filter tip based on constant flow is characterized by comprising the following steps:
(1) fixing the cigarette to be tested on the sleeve, and enabling the filter tip of the cigarette to be tested to be completely positioned in the sleeve;
(2) igniting the cigarette to be tested;
(3) performing air extraction operation on the sleeve at a constant flow rate, and acquiring a distance d between a combustion line of the cigarette and one end, far away from the combustion line, of the filter tip;
(4) obtaining the ventilation Q of the cigarette filterd；
(5) Calculating the ventilation rate Q of the cigarette filter when the distance between the combustion line of the cigarette and the end of the filter far away from the combustion line is dd/q。
2. The constant flow based dynamic filter ventilation rate detection method according to claim 1, wherein the step (1) is as follows:
(1-1) inserting the cigarette to be tested into the sleeve, so that the filter tip of the cigarette to be tested is completely positioned in the sleeve, and the combustion part of the cigarette to be tested is completely positioned outside the sleeve;
and (1-2) clamping the joint of the filter tip and the combustion part of the cigarette to be tested through a first flexible sleeve capable of being filled with air so as to fix the cigarette to be tested in the sleeve.
3. The constant flow based dynamic filter ventilation rate detection method according to claim 2, wherein the step (1) further comprises:
and (1-3) sealing the gap between the cigarette to be tested and the suction side of the sleeve through a second flexible sleeve capable of being filled with air.
4. The constant flow based dynamic filter ventilation rate detection method according to claim 3, wherein the step (1) further comprises:
and (1-4) performing air suction operation on the sleeve at a constant flow rate until the suction air flow is stable.
5. The constant flow based dynamic filter ventilation rate detection method according to claim 1, wherein the constant flow rate in step (3) is 17.5 mL/s.
6. The constant flow-based dynamic filter ventilation rate detection method according to claim 1, wherein the air flow direction during the air suction operation in the step (3) is collinear with the central axis of the cigarette to be tested.
7. The constant flow-based dynamic filter ventilation rate detection method according to claim 6, wherein the cigarette filter ventilation Q in step (4)dObtained by a flow detection mechanism arranged on the sleeve.
8. The constant flow-based dynamic filter ventilation rate detection method according to claim 7, wherein the flow direction of the air flowing to the flow rate detection mechanism in the step (4) is perpendicular to the flow direction of the air during the air suction operation.
9. Method for constant flow based dynamic filter ventilation rate detection according to any of the claims 1 to 8, characterized in that said step (5) is in particular as follows:
calculating ventilation rate kQ of cigarette filter tip when distance between combustion line of cigarette and end of filter tip far from combustion line is ddAnd/q, wherein k is a ventilation rate correction coefficient, and k is 0.01-0.03.
10. Constant flow dynamic filter ventilation rate detection method as claimed in claim 9, wherein the ventilation rate correction factor in step (5)Wherein P isAtmospheric pressure, PdIs the difference between the pressure on the suction side of the sleeve and atmospheric pressure.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112525790A (en) * | 2020-10-26 | 2021-03-19 | 河南中烟工业有限责任公司 | Cigarette filter ventilation hole detecting system |
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