CN114112789A - Device and method for detecting oxygen content of tobacco section in sealed heating cigarette - Google Patents
Device and method for detecting oxygen content of tobacco section in sealed heating cigarette Download PDFInfo
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- CN114112789A CN114112789A CN202010901973.8A CN202010901973A CN114112789A CN 114112789 A CN114112789 A CN 114112789A CN 202010901973 A CN202010901973 A CN 202010901973A CN 114112789 A CN114112789 A CN 114112789A
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- 241000208125 Nicotiana Species 0.000 title claims abstract description 84
- 235000002637 Nicotiana tabacum Nutrition 0.000 title claims abstract description 84
- 235000019504 cigarettes Nutrition 0.000 title claims abstract description 76
- 238000010438 heat treatment Methods 0.000 title claims abstract description 70
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 239000001301 oxygen Substances 0.000 title claims abstract description 44
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000007789 sealing Methods 0.000 claims abstract description 70
- 239000007789 gas Substances 0.000 claims abstract description 45
- 230000000391 smoking effect Effects 0.000 claims abstract description 42
- 238000012545 processing Methods 0.000 claims abstract description 17
- 238000003780 insertion Methods 0.000 claims description 18
- 230000037431 insertion Effects 0.000 claims description 18
- 238000001514 detection method Methods 0.000 claims description 15
- 238000012360 testing method Methods 0.000 claims description 8
- 238000005259 measurement Methods 0.000 claims description 7
- 238000005086 pumping Methods 0.000 claims description 7
- 239000000779 smoke Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 239000004696 Poly ether ether ketone Substances 0.000 claims description 4
- 239000004743 Polypropylene Substances 0.000 claims description 4
- 229920002530 polyetherether ketone Polymers 0.000 claims description 4
- 229920001155 polypropylene Polymers 0.000 claims description 4
- 229920002725 thermoplastic elastomer Polymers 0.000 claims description 4
- 229920002943 EPDM rubber Polymers 0.000 claims description 3
- 239000004593 Epoxy Substances 0.000 claims description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 3
- 229920006311 Urethane elastomer Polymers 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229920001084 poly(chloroprene) Polymers 0.000 claims description 3
- -1 polypropylene Polymers 0.000 claims description 3
- 229920001296 polysiloxane Polymers 0.000 claims description 3
- 239000004800 polyvinyl chloride Substances 0.000 claims description 3
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 3
- 239000000344 soap Substances 0.000 claims description 3
- 230000000977 initiatory effect Effects 0.000 claims description 2
- 238000004891 communication Methods 0.000 claims 2
- 238000007689 inspection Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 235000019505 tobacco product Nutrition 0.000 description 5
- 238000013461 design Methods 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
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- 239000000126 substance 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
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
- G01N7/14—Analysing materials by measuring the pressure or volume of a gas or vapour by allowing the material to emit a gas or vapour, e.g. water vapour, and measuring a pressure or volume difference
- G01N7/16—Analysing materials by measuring the pressure or volume of a gas or vapour by allowing the material to emit a gas or vapour, e.g. water vapour, and measuring a pressure or volume difference by heating the material
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- Pathology (AREA)
- Manufacturing Of Cigar And Cigarette Tobacco (AREA)
Abstract
The invention provides a device and a method for detecting the oxygen content of a tobacco section in a sealed and heated cigarette, wherein the device comprises a heating cavity, a sealing cavity, a first sealing part, a second sealing part, a flow detector, a smoking machine and a processing system, wherein the first sealing part is simultaneously arranged on two end faces of the heating cavity and the sealing cavity which are adjacent to each other, and the first sealing part and the second sealing part are respectively arranged on two opposite end faces of the sealing cavity; the cigarette passes through the first and second sealing components to seal the tobacco segment within the heating cavity and to seal a portion of the hollow segment within the sealed cavity; the end part of the filter tip section is inserted into a smoking machine; the flow detector is connected to the tail end of a gas pipeline communicated with the inside of the sealed cavity; and the processing system is connected to the flow detector to receive the volume of gas entering the gas pipeline detected by the flow detector and obtain the oxygen content of the tobacco section. The device has simple structure, easy operation and fast analysis speed.
Description
Technical Field
The invention relates to the field of tobacco product detection, in particular to a device and a method for detecting the oxygen content of a tobacco section in a sealed and heated cigarette.
Background
The cigarette can produce thousands of chemical substances in the burning and smoking process, wherein part of smoke components have great harm to human health and can cause various diseases. The diversification development of the tobacco products provides a great opportunity for heating novel tobacco products which do not burn. The heating temperature applied to heat the cigarette without burning is generally low, so that the types and the release amount of harmful ingredients are obviously reduced. On one hand, the harm of the cigarettes to human bodies is reduced, and on the other hand, the requirements of smoking people on the cigarettes are met, so that the cigarettes are attracted by consumers and the attention of enterprises. At present, the research and development force on novel cigarette smoking sets is increased, but in order to ensure that tobacco does not burn, the applied heating temperature is generally lower and does not exceed 300 ℃, so that the defects that the tobacco products which are not burnt by heating generally have low smoke satisfaction and the like are caused.
The Chinese patent application (application No. 201911174480.2) proposes a closed type heating non-combustion cigarette, which adopts a closed type smoking set, and makes tobacco thermally decompose more smoke components by reducing the content of oxygen in cigarettes and properly increasing the heating temperature of the smoking set, thereby improving the situation of poor satisfaction of heating cigarettes. However, in such a closed smoking set, the specific trend of change in the oxygen content and the specific numerical value of the oxygen content in the tobacco section of the cigarette during smoking of the heated cigarette are unknown, and thus the specific effects of such a closed smoking set cannot be confirmed. Furthermore, although the heating temperature of the smoking set can be increased appropriately, it is not certain how the heating temperature program of the heating chamber is set to control the oxygen concentration of the tobacco segment.
Disclosure of Invention
In order to solve the above problems, the present invention provides a device and a method for detecting the oxygen content of a tobacco segment in a sealed heated cigarette, wherein the device has a simple structure, is easy to operate and has a fast analysis speed, and a designer can adjust a heating program according to the change process of the oxygen content, so as to optimize the heating effect of the tobacco segment and optimize the smoking experience of a user.
According to one aspect of the present invention, there is provided an apparatus for detecting the oxygen content of a tobacco segment in a sealed heated cigarette comprising a heating chamber, a sealed chamber, a first sealing member, a second sealing member, a flow detector, a smoking machine and a processing system, the cigarette comprising a tobacco segment, a hollow segment and a filter segment which are contiguous in sequence, wherein:
the first sealing part is detachably arranged on two end faces of the heating cavity and the sealing cavity which are adjacent to each other, and the first sealing part and the second sealing part are detachably arranged on two opposite end faces of the sealing cavity respectively during detection;
the heating cavity and the sealed cavity both have hollow structures, and the cigarette passes through the first sealing part and the second sealing part during detection so as to seal the tobacco section in the heating cavity and seal a part of the hollow section in the sealed cavity;
the end part of the filter tip section is inserted into a smoking machine;
the flow detector is connected to the tail end of a gas pipeline communicated with the inside of the sealed cavity; and
the processing system is connected to the flow detector for receiving the volume of gas entering the gas line detected by the flow detector and obtaining the oxygen content of the tobacco segment by processing said volume.
According to one embodiment, the heating chamber comprises tobacco segment insertion holes formed on an end face adjacent to the sealed chamber for inserting the first sealing member, and the sealed chamber comprises first and second hollow segment insertion holes formed on opposite end faces, respectively, wherein the first hollow segment insertion holes are for inserting the first sealing member and the second hollow segment insertion holes are for inserting the second sealing member.
Alternatively, the first sealing member may be a pipe having a sealing ring in each of the two ends.
Further alternatively, each of the first and second seal members may be a seal ring.
Further, the sealing ring may have a thickness of between 0.5mm-10 mm.
Preferably, the sealing ring may have a width of between 1mm-10 mm.
According to an alternative embodiment, the first and second sealing members may be made of epoxy, polyvinyl chloride, ethylene propylene diene monomer, silicone, thermoplastic elastomer, neoprene, or urethane rubber.
According to another embodiment, the hollow section has a central cavity that extends through the hollow section in the axial direction of the cigarette, and the side wall of the hollow section is formed with at least one side wall through hole that communicates with the central cavity, the at least one side wall through hole being located within the sealed cavity during inspection.
Further, the cigarette can also comprise an external wrapping piece wrapped on the outer sides of the tobacco section, the hollow section and the filter section, and coaxial wrapping piece through holes are formed in the external wrapping piece at positions corresponding to the at least one side wall through hole.
Preferably, the aperture of the through hole of the wrapping piece is not smaller than that of the through hole of the side wall.
According to another alternative embodiment, the internal cavity of the heating chamber has the same shape and dimensions as the tobacco segment, so that there is no gap between the tobacco segment and the internal wall of the heating chamber.
Further, the gas line and the sealed housing may be integrally formed.
Alternatively, the gas line may be connected to the sealed housing in a split manner.
According to yet another alternative embodiment, each of the heating chamber and the sealed chamber has a cylindrical shape.
Alternatively, the heating chamber may be made of ceramic, glass or metal.
Alternatively, the sealed housing may be made of polypropylene, polyetheretherketone, or a high temperature resistant flexible material.
In addition, the flow detector can be one or more of a laminar flow sensor flowmeter, a soap bubble flowmeter and a gas mass flowmeter.
Preferably, the measurement accuracy of the flow detector may be 0.01 mL.
According to another aspect of the present invention, there is provided a method for detecting the oxygen content of a tobacco segment of a cigarette using the apparatus described above, comprising the steps of:
inserting the cigarette to be tested into the heating cavity and the sealed cavity through the first sealing part and the second sealing part, so that the tobacco section is sealed in the heating cavity and a part of the hollow section is sealed in the sealed cavity;
inserting the end of the filter segment into a smoking machine and checking the sealing status of the device;
selecting a smoking mode of the smoking machine and starting smoking;
detecting and recording the nth port suction through a flow detector and sending the detected volume of gas entering the gas pipeline to a processing system; and
calculating, by the processing system, an oxygen content of the tobacco segment of the cigarette according to the following formula:
wherein:
Xn: oxygen content in the tobacco segment at the nth puff;
v: the volume of gas drawn by each mouth of the smoking machine;
Vn: when the nth port is used for pumping, the gas enters the gas volume of the hollow section through the gas pipeline;
r: the radius of the tobacco section;
i: length of tobacco section:
epsilon: porosity of the tobacco section;
Xn-1: oxygen content in the tobacco segment during the (n-1) th puff; and
oxygen content X in tobacco segments without starting to smoke0＝21％。
According to one embodiment, the hollow section has a central cavity extending through the hollow section in the axial direction of the cigarette, and the side wall of the hollow section is formed with at least one side wall through hole communicating with the central cavity, the at least one side wall through hole being located within the sealed cavity during inspection, such that gas enters the hollow section via the at least one side wall through hole.
Further, before being detected, the cigarettes can be balanced for 48 hours in an environment with the temperature of 22 +/-2 ℃ and the relative humidity of 60 +/-5%, and the cigarettes with the average mass difference within the range of 5mg are selected for detection.
Alternatively, the pumping mode may include an ISO pumping mode or an HCl pumping mode.
Drawings
The above and other aspects and features of the present invention will become apparent from the following description of the embodiments with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of the structure of an apparatus for detecting the oxygen content of a tobacco segment in a sealed, heated cigarette according to an embodiment of the present invention;
fig. 2 is a sectional view showing the structure of a cigarette to be tested according to an exemplary embodiment of the present invention.
Detailed Description
The apparatus and method for detecting the oxygen content of a tobacco segment in a sealed, heated cigarette according to the present invention will now be described in detail with reference to the accompanying drawings, which illustrate illustrative, non-limiting embodiments of the invention.
The detection device according to the present invention is used for detecting the oxygen content of a tobacco segment in a sealed and heated cigarette, and comprises a heating cavity 1, a sealed cavity 2, a first sealing part 3, a second sealing part 4, a flow detector 5, a smoking machine 6 and a processing system (not shown in the figure), as shown in fig. 1. The cigarette 7 to be tested generally comprises, in succession, a tobacco section 71, a hollow section 72 and a filter section 73. For example, the heating chamber 1 may adopt one or more of circumferential heating, central heating, end heating and electromagnetic heating.
Specifically, the heating cavity 1 and the sealing cavity 2 are adjacently arranged and both have a hollow structure. For example, each of the heating chamber 1 and the sealed chamber 2 may have a cylindrical shape. The first sealing member 3 is detachably provided on both end faces of the heating chamber 1 and the sealing chamber 2 adjacent to each other, as shown in fig. 1. In addition, the first seal member 3 and the second seal member 4 are detachably located on the opposite end faces of the sealed housing 2, respectively, during the inspection. This structure is such that when a cigarette passes through the first sealing member 3 and the second sealing member 4 during inspection, the tobacco section 71 is sealed within the heating chamber 1 so as to be heated, and a part of the hollow section 72 is sealed within the sealed chamber 2 so as to achieve sealing between the tobacco section 71 and the heating chamber 1 and sealing between the hollow section 72 and the sealed chamber 2, thereby constituting a hermetic inspection structure. The end of the filter segment 73 is inserted into the smoking machine 6 to produce smoke upon smoking by the smoking machine.
The flow rate detector 5 is connected to the end of a gas pipe 21 communicating with the inside of the sealed chamber 2. Referring to fig. 1, one end of a gas line 21 communicates with the inside of the sealed chamber 2, and the other end is connected to a flow rate detector 5. According to one example, the gas line 21 may be integrally formed with the sealed housing 2. Alternatively, the gas line may also be connected to the sealed housing in a separate manner. The processing system is connected to the flow detector 5 for receiving the volume of gas entering the gas line 21 detected by the flow detector 5 and obtaining the oxygen content of the tobacco segment by processing said volume. According to an alternative embodiment, the flow detector may be one or more of a laminar flow sensor flow meter, a soap bubble flow meter, and a gas mass flow meter. Preferably, the measurement accuracy of the flow detector may be 0.01 mL.
The detection device has simple structure, easy operation and high analysis speed. In addition, the detection device can detect the oxygen content of the tobacco section of the sealed and heated cigarette in the smoking process, and the detection result of the oxygen content provides design reference for parameters such as the porosity of the tobacco section of the cigarette, the length of the tobacco section, the number of through holes in the side wall of the hollow section, the diameter and the like. The measurement of the oxygen content may also provide a reference for the control of the heating temperature of the tobacco segment, so that the designer may adjust the heating program according to the variation process of the oxygen content, thereby optimizing the heating effect of the tobacco segment and optimizing the smoking experience of the user.
According to one embodiment of the invention, the heating chamber 1 may comprise a tobacco segment insertion hole 11 formed on an end face adjacent to the sealed chamber 2 for inserting the first sealing member 3. The seal housing 2 may include a first hollow section insertion hole 22 for inserting the first seal member 3 and a second hollow section insertion hole 23 for inserting the second seal member 4, which are formed on opposite end surfaces, respectively.
According to another example, the first sealing member may be a tube having a sealing ring in each of the two ends to communicate between the tobacco segment insertion hole 11 and the first hollow segment insertion hole 22. The first and second seal members may have the same or different structures. Preferably, each of the first and second seal members 3 and 4 may be a seal ring. For example, the sealing ring may have a thickness of between 0.5mm-10 mm. In addition, the sealing ring may, for example, have a width of between 1mm and 10 mm. According to yet another example, the first sealing member 3 and the second sealing member 4 may be selected independently of each other from epoxy, polyvinyl chloride, ethylene propylene diene monomer, silicone, thermoplastic elastomer (TPE), neoprene, urethane rubber, or other organic polymer rubber. Because the first sealing part and the second sealing part can be made of the flexible material, the cigarette packaging box can have the best sealing effect on cigarettes within a certain diameter range, and is suitable for novel tobacco products with various specifications.
According to an exemplary embodiment of the invention, the hollow section 72 of the cigarette may have a central cavity 721 extending through said hollow section in the axial direction of said cigarette, and the side wall of the hollow section 72 may be formed with at least one side wall through hole 722 communicating with the central cavity 721, said at least one side wall through hole being located completely within the sealed cavity 2 during inspection, as shown in fig. 2. The contact part of the cigarette 7 to be tested and the tobacco section insertion hole 11 and the first hollow section insertion hole 22 is sealed by the first sealing part 3, and the contact part of the cigarette 7 to be tested and the second hollow section insertion hole 23 is sealed by the second sealing part 4. Therefore, according to the exemplary embodiment, the external air can only enter the hollow section 72 through the flow detector 5 via the air pipe 21 and the side wall through hole 722, and the tobacco section 71 is sealed in the heating chamber 1 independently. For example, the ends of the tobacco section 71 may or may not be sealed.
Further preferably, the cigarette to be tested may further comprise an outer wrapper 74 wrapped outside the tobacco section 71, the hollow section 72 and the filter section 73, the outer wrapper being formed with coaxial wrapper through holes 741 at positions corresponding to the sidewall through holes 722 to allow gas to enter the hollow section. Preferably, the aperture of the through hole of the packing member is not smaller than that of the through hole 722 of the sidewall. In addition, the cigarette that awaits measuring can also set up other parts between tobacco section and cavity section, or cavity section and filter tip section, as long as guarantee during the measurement that other parts are by independent confined pipeline parcel can.
According to another embodiment, the internal cavity of the heating cavity and the tobacco segment 71 may have the same shape and dimensions so that there is no gap between the tobacco segment and the inner wall of the heating cavity. The heating chamber 1 may have a separate heating element disposed therein, or the heating chamber 1 itself may be used as the heating element. For example, the heating chamber 1 may have a heating plate on the outer wall of the end face opposite to the tobacco segment insertion hole 11, said heating plate being externally connected to a power source.
For example, the heating chamber 1 may be made of ceramic, glass, metal, or the like. Alternatively, the sealed housing 2 may be made of polypropylene (PP), Polyetheretherketone (PEEK) or a high temperature resistant flexible material. When the sealed cavity is made of a high-temperature-resistant flexible material, for example, the sealed cavity may be made of a high-temperature-resistant rubber, a high-temperature-resistant silicone rubber, or the like. The high-temperature-resistant flexible material is not deformed under the atmospheric pressure and the temperature of 250 ℃ without external force.
The method for detecting the oxygen content of the tobacco section in the sealed and heated cigarette according to the invention is described below, and the method uses the detection device to detect the oxygen content of the tobacco section in the cigarette during smoking. Specifically, the detection method according to the present invention may include the steps of:
inserting the cigarette 7 to be tested into the heating cavity 1 and the sealed cavity 2 through the first sealing part 3 and the second sealing part 4, so that the tobacco section 71 is sealed in the heating cavity 1 and part of the hollow section 72 is sealed in the sealed cavity 2;
inserting the end of the filter segment 73 into the smoking machine 6 and checking the sealing state of the detection means;
selecting a puff mode for the smoking machine 6 and initiating a puff, for example, the puff mode may comprise a standard puff mode (ISO puff mode), a canadian deep puff mode (HCl puff mode), or any one of the puff modes commonly used in the art;
detecting and recording the nth port suction by the flow detector 5 and sending the detected volume of gas entering the gas line 21 to the processing system; and
calculating, by the processing system, an oxygen content of the tobacco segment of the cigarette according to the following formula:
wherein:
Xn: oxygen content in the tobacco segment 71 at the nth puff;
v: the volume of gas drawn by the smoking machine 6 per puff;
Vn: the volume of gas entering the hollow section 72 through the gas line 21 at the nth port suction;
r: the radius of the tobacco section 71;
i: the length of the tobacco section 71;
epsilon: the porosity of the tobacco section 71;
Xn-1: oxygen content in the tobacco segment 71 during the (n-1) th puff; and
oxygen content X in the tobacco segment without starting to smoke, i.e. with n being 00＝21％。
According to one embodiment, when the hollow section 72 has an axial central cavity 721 and at least one sidewall through hole 722, gas enters the hollow section 72 via the sidewall through hole 722.
When the cigarette is detected, the cigarette sample to be detected can be balanced for 48 hours in an environment with the temperature of 22 +/-2 ℃ and the relative humidity of 60 +/-5% before being detected, and the cigarette with the average mass difference within the range of 5mg is selected for detection.
Next, an exemplary embodiment according to the present invention will be described, in which measurement is performed using the detection apparatus according to the present invention and the cigarette 7 to be measured. Specifically, the method comprises the following steps:
1. preparing and selecting a sample of the cigarette which is not burned by heating: preparing 20 cigarettes 7 to be tested, balancing the cigarette samples for 48 hours in an environment with the temperature of 22 +/-2 ℃ and the relative humidity of 60 +/-5%, selecting 5 cigarettes as test cigarette samples, and controlling the average mass within the range of 5 mg;
2. connecting the test cigarette sample with the detection device according to the figure 1; and
3. the smoking machine 6 is started to perform the ISO standard mode smoking,the smoking flow of each mouth is set to be 35mL, each 2s, the smoking machine 6 detects and records the smoking volume of each mouth, the flow detector 5 detects the gas flow entering the gas pipeline 21 in real time and records the volume V of the gas entering the cigarette during each mouth smokingn(n is the number of puffs), the data obtained and processed to obtain the oxygen content of the tobacco segment, as shown in table 1 as the average of the data for 5 test cigarette samples.
The physical parameters of the test cigarette samples were as follows: r is 3.65mm, I is 15mm, and ε is 80%.
TABLE 1 variation of oxygen content in tobacco segments of a cigarette under ISO suction mode
As can be seen from Table 1, the oxygen content of the tobacco segment after the second puff is substantially close to 0. This demonstrates that the cigarette construction is effective in reducing the oxygen concentration in the tobacco segment.
The measurement of oxygen content also provides a reference for the control of the heating temperature of the tobacco segment. When the cigarette is smoked, a designer can design the heating program to be lower temperature when the first mouth and the second mouth are smoked, and the heating temperature is increased to be higher temperature after the second mouth is smoked without worrying about the burning of the cigarette. This may optimise the heating effect of the tobacco section, optimising the user smoking experience.
Although exemplary embodiments of the present invention have been described, it will be apparent to those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.
Claims (22)
1. The utility model provides a device for detecting tobacco section oxygen content in sealed heating cigarette, includes heating cavity, seal chamber, first seal part, second seal part, flow detector, smoking machine and processing system, the cigarette includes tobacco section, cavity section and the filter segment that adjoins in proper order, wherein:
the first sealing part is detachably arranged on two end faces of the heating cavity and the sealing cavity which are adjacent to each other, and the first sealing part and the second sealing part are detachably arranged on two opposite end faces of the sealing cavity during detection respectively;
the heating cavity and the sealed cavity both have a hollow structure, the cigarette passing through the first and second sealing components during testing to seal the tobacco segment within the heating cavity and a portion of the hollow segment within the sealed cavity;
the end of the filter segment is inserted into the smoking machine;
the flow detector is connected to the end of a gas pipeline communicated with the inside of the sealed cavity; and
the processing system is connected to the flow detector for receiving the volume of gas entering the gas line detected by the flow detector and obtaining the oxygen content of the tobacco segment by processing the volume.
2. The apparatus of claim 1, wherein:
the heating cavity comprises a tobacco segment insertion hole formed on an end face adjacent to the sealed cavity for inserting the first sealing component; and
the seal cavity comprises a first hollow section insertion hole and a second hollow section insertion hole which are formed on two opposite end faces respectively, wherein the first hollow section insertion hole is used for inserting the first seal component, and the second hollow section insertion hole is used for inserting the second seal component.
3. The device of claim 1, wherein the first sealing member is a pipe having a sealing ring in each of two ends.
4. The device of claim 1, wherein each of the first and second sealing members is a sealing ring.
5. The device of claim 4, wherein the sealing ring has a thickness between 0.5mm-10 mm.
6. The device of claim 4, wherein the sealing ring has a width of between 1mm-10 mm.
7. The device of claim 1, wherein the first and second sealing members are made of epoxy, polyvinyl chloride, ethylene propylene diene monomer, silicone, thermoplastic elastomer, neoprene, or urethane rubber.
8. The apparatus of claim 1, wherein the hollow section has a central cavity therethrough in an axial direction of the cigarette, and the side wall of the hollow section is formed with at least one side wall through hole in communication with the central cavity, the at least one side wall through hole being located within the sealed cavity during testing.
9. The apparatus of claim 8, wherein the cigarette further comprises an outer wrap wrapped around the tobacco section, the hollow section and the filter section, the outer wrap being formed with coaxial wrap through holes at locations corresponding to the at least one sidewall through hole.
10. The apparatus of claim 9, wherein the diameter of the wrap through hole is not smaller than the diameter of the sidewall through hole.
11. The apparatus of claim 1, wherein the internal cavity of the heating cavity is the same shape and size as the tobacco section such that there is no gap between the tobacco section and the inner wall of the heating cavity.
12. The apparatus of claim 1, wherein the gas line is integrally formed with the sealed housing.
13. The apparatus of claim 1, wherein the gas line is connected to the sealed housing in a split manner.
14. The apparatus of claim 1, wherein each of the heating chamber and the sealed chamber has a cylindrical shape.
15. The apparatus of claim 1, wherein the heating chamber is made of ceramic, glass, or metal.
16. The device of claim 1, wherein the sealed housing is made of polypropylene, polyetheretherketone, or a high temperature resistant flexible material.
17. The device of claim 1, wherein the flow detector is one or more of a laminar flow sensor flow meter, a soap bubble flow meter, and a gas mass flow meter.
18. The apparatus of claim 1, wherein the flow detector has a measurement accuracy of 0.01 mL.
19. A method of detecting the oxygen content of a tobacco segment of a cigarette using the apparatus of claim 1, comprising the steps of:
inserting a cigarette to be tested into the heating cavity and the sealed cavity via the first sealing member and the second sealing member such that the tobacco section is sealed within the heating cavity and a portion of the hollow section is sealed within the sealed cavity;
inserting the end of the filter segment into the smoking machine and checking the sealing status of the device;
selecting a smoking mode of the smoking machine and initiating smoking;
detecting and recording the nth port puff through the flow detector and sending the detected volume of gas entering the gas line to the processing system; and
calculating, by the processing system, an oxygen content of the tobacco segment of the cigarette according to the following formula:
wherein:
Xn: oxygen content in the tobacco segment at the nth puff;
v: the volume of gas drawn by each mouth of the smoking machine;
Vn: the volume of gas entering the hollow section through the gas line during the suction of the nth port;
r: a radius of the tobacco segment;
i: a length of the tobacco segment;
epsilon: a porosity of the tobacco section;
Xn-1: oxygen content in the tobacco segment upon puff at mouth (n-1); and
oxygen content X in the tobacco segment without starting to smoke0＝21％。
20. The method of claim 19, wherein the hollow section has a central cavity extending through the hollow section in an axial direction of the cigarette, and the side wall of the hollow section is formed with at least one side wall through hole in communication with the central cavity, the at least one side wall through hole being located within the sealed cavity during testing such that gas enters the hollow section via the at least one side wall through hole.
21. The method according to claim 19, wherein the cigarettes are equilibrated for 48 hours at a temperature of 22 ± 2 ℃ and a relative humidity of 60 ± 5% before being tested, and cigarettes having an average mass difference within 5mg are selected for testing.
22. The method of claim 19, wherein the pumping mode comprises an ISO pumping mode or an HCl pumping mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010901973.8A CN114112789A (en) | 2020-08-31 | 2020-08-31 | Device and method for detecting oxygen content of tobacco section in sealed heating cigarette |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010901973.8A CN114112789A (en) | 2020-08-31 | 2020-08-31 | Device and method for detecting oxygen content of tobacco section in sealed heating cigarette |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114112789A true CN114112789A (en) | 2022-03-01 |
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