CN111387543A - Heating cigarette using Venturi type hollow filter stick - Google Patents
Heating cigarette using Venturi type hollow filter stick Download PDFInfo
- Publication number
- CN111387543A CN111387543A CN202010313314.2A CN202010313314A CN111387543A CN 111387543 A CN111387543 A CN 111387543A CN 202010313314 A CN202010313314 A CN 202010313314A CN 111387543 A CN111387543 A CN 111387543A
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- CN
- China
- Prior art keywords
- hollow filter
- venturi
- hollow
- filter stick
- heated cigarette
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 235000019504 cigarettes Nutrition 0.000 title claims abstract description 51
- 238000010438 heat treatment Methods 0.000 title abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 15
- 241000208125 Nicotiana Species 0.000 claims abstract description 14
- 235000002637 Nicotiana tabacum Nutrition 0.000 claims abstract description 14
- 239000000126 substance Substances 0.000 claims abstract description 4
- 229920000747 poly(lactic acid) Polymers 0.000 claims description 6
- 239000004626 polylactic acid Substances 0.000 claims description 6
- 230000003247 decreasing effect Effects 0.000 claims description 5
- 239000004014 plasticizer Substances 0.000 claims description 5
- 229920001747 Cellulose diacetate Polymers 0.000 claims description 4
- 239000004743 Polypropylene Substances 0.000 claims description 4
- 229920000642 polymer Polymers 0.000 claims description 4
- -1 polypropylene Polymers 0.000 claims description 4
- 229920001155 polypropylene Polymers 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 229910010293 ceramic material Inorganic materials 0.000 claims description 2
- 229920005594 polymer fiber Polymers 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 239000011230 binding agent Substances 0.000 claims 1
- 239000000779 smoke Substances 0.000 abstract description 28
- 239000000443 aerosol Substances 0.000 abstract description 14
- 230000000391 smoking effect Effects 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 7
- 230000008859 change Effects 0.000 abstract description 5
- 238000001816 cooling Methods 0.000 abstract description 5
- 239000012530 fluid Substances 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 239000011218 binary composite Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 210000000214 mouth Anatomy 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000011206 ternary composite Substances 0.000 description 2
- SNICXCGAKADSCV-JTQLQIEISA-N (-)-Nicotine Chemical compound CN1CCC[C@H]1C1=CC=CN=C1 SNICXCGAKADSCV-JTQLQIEISA-N 0.000 description 1
- 206010006784 Burning sensation Diseases 0.000 description 1
- 206010022998 Irritability Diseases 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 229920006239 diacetate fiber Polymers 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000007788 liquid 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
- 238000002360 preparation method Methods 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 235000019505 tobacco product Nutrition 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
- A24D1/00—Cigars; Cigarettes
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
- A24D1/00—Cigars; Cigarettes
- A24D1/04—Cigars; Cigarettes with mouthpieces or filter-tips
- A24D1/045—Cigars; Cigarettes with mouthpieces or filter-tips with smoke filter means
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
- A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
- A24D3/04—Tobacco smoke filters characterised by their shape or structure
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
- A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
- A24D3/06—Use of materials for tobacco smoke filters
- A24D3/08—Use of materials for tobacco smoke filters of organic materials as carrier or major constituent
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
- A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
- A24D3/06—Use of materials for tobacco smoke filters
- A24D3/08—Use of materials for tobacco smoke filters of organic materials as carrier or major constituent
- A24D3/10—Use of materials for tobacco smoke filters of organic materials as carrier or major constituent of cellulose or cellulose derivatives
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Cigarettes, Filters, And Manufacturing Of Filters (AREA)
Abstract
The invention relates to a heated cigarette using a Venturi type hollow filter stick, which consists of tobacco substances and a hollow filter stick with a Venturi structure, wherein the structure of the hollow cavity is periodically and continuously changed along the axial direction of the hollow filter stick, so that a series combination of a group of thick cavities and thin cavities which are connected in series is formed. When smoke generated by high-temperature heating of tobacco materials passes through the cavity, the flow speed of smoke fluid is changed due to the change of the cavity structure, the fluid state is forcibly changed from laminar flow to turbulent flow, the heat conduction efficiency is improved, and the heat conduction cooling effect is better; meanwhile, when the smoke aerosol passes through the Venturi type hollow filter stick, the aerosol is collided, condensed and released heat due to the fact that the diameter of the inner cavity part is changed in a continuous and alternate mode, and the cooling effect is further enhanced. The cigarette heated by the Venturi type hollow filter stick has the advantages of sufficient smoke amount, moderate inlet temperature, good smoking experience, simple processing technology and small product control difficulty in terms of actual production.
Description
Technical Field
The invention belongs to the technical field of tobacco, and particularly relates to a heating cigarette using a Venturi type hollow filter stick.
Background
The smoke of the heated cigarette is in an aerosol state in the filter stick, aerosol particles are tiny liquid drops, and the smoke temperature has direct influence on the particle size and the components of the aerosol, so that the quantity of harmful components in the smoke and the sensory quality of the cigarette are influenced. The tobacco material in a heated cigarette is typically heated in a heating device at 250-350 ℃ under conditions that provide for sufficient release of nicotine and a portion of the aromatic material. But the cigarette length of heating cigarette is short, and the cigarette props up and is in the utensil high temperature and surrounds, and heat exchange efficiency is poor, and entry end flue gas temperature is too high, and burning sensation and irritability obviously rise, and consumer's smoking experience is relatively poor. The reduction of flue gas temperature is the technological direction of continuous improvement of such products.
For heated cigarettes, the amount of smoke produced during smoking is directly related to the resistance of the filter rod to draw and the efficiency of the filter. By combining the product characteristics of the heated cigarette, when the smoking resistance is large and the filtering efficiency is high, the smoke aerosol is absorbed by the filter stick more, the smoke amount is small, and the experience and satisfaction of a smoker are poor; on the contrary, when the suction resistance is small and the filtering efficiency is low, the smoke amount is large, and the experience and satisfaction of the smoker are good. Reducing the draw resistance is also a continuing improvement in the art of heating cigarette products.
In addition, the heating cigarette usually adopts a four-section or five-section composite structure, the production process is complex, and the product quality is difficult to control.
Disclosure of Invention
The invention aims to provide a heated cigarette using a Venturi type hollow filter stick, and aims to solve the problems of complex production process, high product control difficulty, high temperature at the inlet end of main stream smoke, small smoke amount, poor smoking experience and the like of the heated cigarette.
The invention is realized by the following technical scheme:
a heating cigarette using a Venturi type hollow filter stick is composed of a tobacco substance and a hollow filter stick with a Venturi tube structure, and the two parts are twisted and jointed into an integral structure through tipping paper.
The length of the heated cigarette is 40-60 mm.
The length of the hollow filter stick is 25-45 mm.
The outer part of the hollow filter stick is of a smooth cylindrical structure, and an axial hollow cavity is arranged in the hollow filter stick;
the diameters of the hollow cavities are not completely the same in the axial direction of the hollow filter stick, and the structures of the hollow cavities show that the diameters of the cavities are periodically and continuously changed, so that a group of series-connected thick cavities and series-connected thin cavities are formed.
The material of the hollow filter stick is a polymer or a ceramic material, wherein the polymer comprises but is not limited to a compact material made of polylactic acid or polypropylene, or a loose porous or compact material made of polymer fibers comprising but not limited to one or more of polylactic acid tows, cellulose diacetate tows or polypropylene tows and a plasticizer or an adhesive.
Preferably, the hollow filter stick is prepared from diacetate fiber tows or polylactic acid tows and a plasticizer or an adhesive.
The hardness of the hollow filter stick is more than 60% of that of a solid filter stick made of the same material and having the same outer diameter.
The hollow cavity is an axial through hollow cavity or an axial non-through hollow cavity.
The hollow cavity is a straight-through cavity structure similar to a Venturi shape, the hollow cavity is formed by connecting a cylindrical pipe and a curved pipe, and the curved pipe is composed of a curved pipe with gradually increased diameter and a curved pipe with gradually decreased diameter; the curved line pipe that the diameter gradually increased and the curved line pipe that the diameter gradually reduced are arc pipe or conical tube.
The invention has the beneficial effects that:
the heating cigarette using the Venturi type hollow filter stick adopts a binary or ternary composite structure, and has the advantages of simple structure, simple production process and small product control difficulty. When smoke generated after the tobacco material is heated at high temperature passes through the cavity, the flow rate of the smoke is changed due to the change of the cavity structure, the fluid state of the smoke is forcibly changed from laminar flow to turbulent flow, the heat conduction efficiency is improved, and the heat conduction cooling effect is better; meanwhile, when the aerosol in the smoke flows through the Venturi type hollow filter stick, the aerosol in the smoke undergoes accelerated expansion in the fine cavity due to the fact that the diameter of the inner cavity part is continuously and alternately changed, the aerosol is decelerated and pressurized in the coarse cavity, the aerosol is collided and condensed in the pressurizing stage, phase change heat release occurs, and the cooling effect is further enhanced; because the middle of the filter stick is of a straight-through structure, the filter stick also has lower suction resistance. The cigarette heated by the Venturi type hollow filter stick has moderate inlet temperature, sufficient smoke amount and good smoking experience.
The invention has reasonable design, simple and unique structure and obvious smoke cooling effect, and the binary or ternary composite heating cigarette can be formed by using the Venturi type hollow filter stick. The cigarette is heated by using the Venturi type hollow filter stick, so that the smoke temperature is reduced, the smoke quantity of the cigarette can be ensured, and the experience of a smoker is met; provides a new solution for improving the quality of cigarettes and developing novel tobacco products.
Drawings
FIG. 1 is a longitudinal cross-sectional view of a heated cigarette of the present invention;
FIG. 2 is a longitudinal cross-sectional view of a heated cigarette of the present invention without a hollow through cavity;
FIG. 3 is a longitudinal cross-sectional view of another embodiment of a heated cigarette of the present invention;
figure 4 is a schematic longitudinal cross-sectional view of a venturi-type hollow filter stick of the present invention;
description of the reference numerals
The cigarette comprises a tobacco part 1, a hollow filter stick 2, a hollow cavity 3, a cylindrical tube 31, an arc tube 32 with gradually increased diameter, an arc tube 33 with gradually decreased diameter, tipping paper 4 and a non-through hollow cavity 5.
Detailed Description
The technical solutions of the present invention are described in detail below by examples, and the following examples are only exemplary and can be used only for explaining and explaining the technical solutions of the present invention, but not construed as limiting the technical solutions of the present invention.
As shown in fig. 1, in the heated cigarette using the venturi tube type hollow filter rod of the present invention, the tobacco portion 1 made of a tobacco material is included, and in the technical means of the present application, the material of the tobacco portion does not fall within the scope of the present application, and therefore, all of the tobacco materials that can be applied to the preparation of the heated cigarette can be applied to the tobacco portion of the present application, and a detailed description thereof will not be given.
The hollow filter stick 2 with the Venturi tube structure is a hollow filter stick prepared by a specific technology, the filter stick is designed through a hollow cavity 3, high-temperature smoke of a heated cigarette is cooled to a proper temperature in an accelerated manner through the change of a gas state, the tobacco part and the hollow filter stick are twisted and connected into an integrated structure through tipping paper, and the complete heated cigarette is prepared. Typically, the heated cigarette has a length of 40-60mm, with the hollow filter rod having a length of 25-45 mm.
In the longitudinal cross-sectional view of the heated cigarette shown in fig. 2, the difference from fig. 1 is only that the hollow cavity is different, specifically, fig. 2, wherein the hollow cavity is a longitudinal non-through hollow cavity 5 structure, when the structure is adopted, the hollow filter stick is made of loose porous substances, and the design of the structure ensures that the hollow cavity is not directly communicated with the oral cavity, reduces the direct impact of mainstream smoke on the oral cavity, and improves the smoking comfort.
Fig. 3 is a schematic longitudinal sectional view of another embodiment of a heated cigarette, which can be understood from the figure and is different from fig. 1 in the structure of a hollow cavity.
As shown in figure 4, the longitudinal section view of the hollow filter stick is a schematic diagram, wherein the enlarged and contracted part of the cavity is in an arc-shaped symmetrical structure, L1 is not less than L2 and not more than 60mm, the outside of the cavity is a hollow filter stick body formed by curing cellulose diacetate tows through a plasticizer, the middle blank part is a Venturi-shaped hollow cavity, the hollow cavity is a straight-through cavity structure similar to the Venturi shape, the hollow cavity is formed by connecting a cylindrical pipe 31 and a curved pipe, the curved pipe is composed of an arc pipe 32 with gradually increased diameter and an arc pipe 33 with gradually decreased diameter, when smoke passes through the middle cavity, the flow speed of smoke fluid is changed due to the change of the cavity structure, the fluid state is forced to be changed from laminar flow to turbulent flow, the heat conduction efficiency is improved, the good heat transfer and temperature reduction effects are achieved, when the smoke aerosol passes through the Venturi type hollow filter stick, the aerosol in the inner cavity is subjected to acceleration expansion in the fine cavity, the pressure is increased in the coarse cavity, the condensation stage of the aerosol is collided and the heat release effect is further strengthened, and the smoke aerosol is used for ensuring that the cigarette is sucked and the cigarette, and the cigarette is low in the straight-through filter stick, and the cigarette smoking experience is also can be ensured.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A heated cigarette using a Venturi-type hollow filter stick is characterized in that the heated cigarette is composed of a tobacco substance and a hollow filter stick with a Venturi structure, and the two parts are twisted and jointed into an integral structure through a tipping paper.
2. A heated cigarette using a venturi-type hollow filter rod according to claim 1 wherein the heated cigarette has a length of 40mm to 60 mm.
3. The heated cigarette using a venturi-type hollow filter rod according to claim 1, wherein the length of the hollow filter rod is 25mm to 45 mm.
4. The heated cigarette using a venturi-type hollow filter rod according to claim 1, wherein the hollow filter rod is of a smooth cylindrical structure on the outside and is provided with an axially hollow cavity on the inside; the diameters of the hollow cavities are not completely the same in the axial direction of the hollow filter stick, and the structures of the hollow cavities show that the diameters of the cavities are periodically and continuously changed, so that a group of series-connected thick cavities and series-connected thin cavities are formed.
5. The heated cigarette using a venturi-type hollow filter rod according to claim 1, wherein the material of the hollow filter rod is a polymer or ceramic material, wherein the polymer includes but is not limited to a dense material made of polylactic acid or polypropylene, or a loose porous or dense material made of polymer fibers including but not limited to one or more combinations of polylactic acid tow, cellulose diacetate tow or polypropylene tow, and a plasticizer or a binder.
6. The heated cigarette using a venturi-type hollow filter rod according to claim 5, wherein the hollow filter rod is prepared from cellulose diacetate tow or polylactic acid tow with a plasticizer or an adhesive.
7. The heated cigarette using a venturi-type hollow filter according to claim 1, wherein the hardness of the hollow filter is 60% or more of the hardness of a solid filter of the same material and the same outer diameter.
8. The heated cigarette using a venturi-type hollow filter rod according to claim 1, wherein the hollow cavities are axially through hollow cavities or axially non-through hollow cavities.
9. The heated cigarette using a venturi-type hollow filter rod according to claim 1, wherein the hollow cavity is a straight-through cavity structure having a venturi-like shape, the hollow cavity is formed by connecting a cylindrical tube and a curved tube, and the curved tube is formed by a curved tube having a gradually increasing diameter and a curved tube having a gradually decreasing diameter; the curve pipe with the diameter gradually increasing and the curve pipe with the diameter gradually decreasing are both arc pipes or conical pipes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010313314.2A CN111387543A (en) | 2020-04-20 | 2020-04-20 | Heating cigarette using Venturi type hollow filter stick |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010313314.2A CN111387543A (en) | 2020-04-20 | 2020-04-20 | Heating cigarette using Venturi type hollow filter stick |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111387543A true CN111387543A (en) | 2020-07-10 |
Family
ID=71412041
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010313314.2A Pending CN111387543A (en) | 2020-04-20 | 2020-04-20 | Heating cigarette using Venturi type hollow filter stick |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111387543A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111772232A (en) * | 2020-07-24 | 2020-10-16 | 昆明吉科科技有限公司 | Degradable hollow composite polylactic acid tow cigarette filter stick capable of reducing smoke temperature |
| CN114847517A (en) * | 2022-06-02 | 2022-08-05 | 云南中烟工业有限责任公司 | Device capable of controlling intensity of filtered flue gas |
| JP2023502304A (en) * | 2020-10-19 | 2023-01-24 | ケーティー アンド ジー コーポレイション | Aerosol-generating article and aerosol-generating system including same |
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| CN104921296A (en) * | 2015-06-25 | 2015-09-23 | 云南中烟工业有限责任公司 | Composite filter tip for heating type non-combustion cigarette |
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| CN108185517A (en) * | 2017-12-18 | 2018-06-22 | 云南中烟工业有限责任公司 | A kind of new cigarette for the cigarette that do not burn for heating |
| CN108851217A (en) * | 2018-05-12 | 2018-11-23 | 浙江大学 | A kind of filter and its application based on doughnut heat-absorbing material |
| CN109090705A (en) * | 2018-06-27 | 2018-12-28 | 当阳鸥翼德电子科技有限公司 | The novel low resistance to suction furrowfilter rod of one kind and preparation method |
| CN109645552A (en) * | 2018-12-25 | 2019-04-19 | 河南中烟工业有限责任公司 | It is a kind of not burn cigarette with hollow and groove structure heating |
| WO2019109926A1 (en) * | 2017-12-07 | 2019-06-13 | 共青城道乐投资管理合伙企业（有限合伙） | Heat-not-burn cigarette filter, heat-not-burn tobacco product, and use method thereof |
| CN212994378U (en) * | 2020-04-20 | 2021-04-20 | 河南中烟工业有限责任公司 | Heating cigarette using Venturi type hollow filter stick |
-
2020
- 2020-04-20 CN CN202010313314.2A patent/CN111387543A/en active Pending
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| CN104921296A (en) * | 2015-06-25 | 2015-09-23 | 云南中烟工业有限责任公司 | Composite filter tip for heating type non-combustion cigarette |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111772232A (en) * | 2020-07-24 | 2020-10-16 | 昆明吉科科技有限公司 | Degradable hollow composite polylactic acid tow cigarette filter stick capable of reducing smoke temperature |
| JP2023502304A (en) * | 2020-10-19 | 2023-01-24 | ケーティー アンド ジー コーポレイション | Aerosol-generating article and aerosol-generating system including same |
| JP7372005B2 (en) | 2020-10-19 | 2023-10-31 | ケーティー アンド ジー コーポレイション | Aerosol generation article and aerosol generation system including the same |
| CN114847517A (en) * | 2022-06-02 | 2022-08-05 | 云南中烟工业有限责任公司 | Device capable of controlling intensity of filtered flue gas |
| CN114847517B (en) * | 2022-06-02 | 2023-08-08 | 云南中烟工业有限责任公司 | Device capable of controlling strength of filtered flue gas |
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