CN101336752A - Filter-tip capable of reducing hydrocyanic acid in cigarette flue gas - Google Patents
Filter-tip capable of reducing hydrocyanic acid in cigarette flue gas Download PDFInfo
- Publication number
- CN101336752A CN101336752A CNA2007100353018A CN200710035301A CN101336752A CN 101336752 A CN101336752 A CN 101336752A CN A2007100353018 A CNA2007100353018 A CN A2007100353018A CN 200710035301 A CN200710035301 A CN 200710035301A CN 101336752 A CN101336752 A CN 101336752A
- Authority
- CN
- China
- Prior art keywords
- cigarette
- filter
- hydrogen cyanide
- sodium
- carrier
- 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
Images
Landscapes
- Cigarettes, Filters, And Manufacturing Of Filters (AREA)
Abstract
A cigarette filter tip, particularly to the filter tip which can reduce the content of hydrocyanic acid in the cigarette flue gas, comprising a modifying agent added in fiber base material which includes one or more kinds of alkaline solid particles of 10-100-mesh, or a carrier adsorb with one or more kinds of alkaline substancesof 10-100-mesh. The additive amount is 10-60mg/each cigarette. The cigarette filter tip with the modifying agent greatly reduces the content of the hydrocyanic acid in cigarette flue gas, while maintaining the original smoking flavor.
Description
Technical field
The present invention relates to a kind of cigarette filter tip, particularly can reduce the cigarette filter of hydrogen cyanide in the cigarette smoke.
Background technology
Hydrogen cyanide is a kind of main harmful substance in the flue gas.In the smoke from cigarette, 92% is gas, and as carbon monoxide, nitrogen oxide, hydrogen cyanide and ammonia etc., wherein hydrogen cyanide content is about 30-300 μ g/ and props up.Hydrogen cyanide can bring out various disease conditions as cardiovascular and cerebrovascular disease, respiratory tract and disease of digestive tract etc.Its toxicity mainly is to cause high swage cytochrome oxidase inactivation, causes the oxygen therapy difficulty, finally causes the tissue anoxic to be poisoned.Improving security, the hydrogen cyanide in the reduction cigarette of sucking cigarette is the important directions that current tobacco science and technology is studied, and also is the important assurance of safeguarding smoker's health.
At present, the hydrogen cyanide of handling in the gas phase is relatively more difficult, and the method for employing generally has: methods such as physical absorption, chemical catalysis.The method of catalysis has the shortcoming of two maximums: the one, and the temperature of having relatively high expectations (as patent CN1416950A and CN1462652A, catalytic temperature requires 250-450 ℃), this is that individual having no idea is the technology that realizes to cigarette; The one, cost of manufacture too high (CN1583257 has adopted nm of gold as patent, and complex manufacturing process), this to cigarette enterprise be can't load-bearing cost burden.The maximum shortcoming of simple physics absorption is the local flavor of sucking that falls harmful DeGrain, has a strong impact on cigarette.
It is ZL02114042.1 that the applicant once disclosed China Patent No., and name is called the patent of " a kind of cigarette filter tip ".In this patent, the disclosed filter tip of the applicant is to add electrolyte in the filter fiber base material.These electrolytes are sodium carbonate, potash, natrium citricum, potassium citrate, aluminium polychloride, polyacrylamide complex salt, polyacrylamide, and one or more in Sodium Polyacrylate, chlorophyll copper sodium, the sodium iron chlorophyllin are composite.The applicant finds by add above-mentioned electrolyte by composite tip stick technology in base filter after, can reduce nicotine, tar in the Virginian-type cigarette main flume, content of harmful such as carbon monoxide do not have adverse effect to the flue-cured tobacco smoking quality again simultaneously.In this patent, do not have to disclose this filter tip to flue gas in a kind of influence of important harmful substance hydrogen cyanide.
The present invention is the further research of the above-mentioned patent of applicant.
Summary of the invention
The purpose of this invention is to provide a kind of filter tip that can significantly reduce hydrogen cyanide content in the cigarette smoke.
Technical scheme of the present invention is: the modifier that adds in fiber base material, described modifier are one or more alkali solid particles of 10~100 purposes, or are adsorbed with 10~100 purpose carriers of one or more alkaline matters; The addition of the carrier after above-mentioned alkali solid particle or the alkaline matter for processing is that 10~60mg/ props up cigarette.
Wherein preferred modifier is 30~60 orders; Preferred modifier addition is that 15~60mg/ props up cigarette.
Said alkali solid particle is selected from sodium carbonate, sodium acid carbonate, sodium thiosulfate, NaOH, dibastic sodium phosphate, sodium dihydrogen phosphate, vulcanized sodium and potash, saleratus, potassium thiosulfate, potassium hydroxide, potassium hydrogen phosphate, potassium dihydrogen phosphate, potassium sulfide.
The said carrier that is adsorbed with alkaline matter is selected from carrier and comprises active carbon, aluminium oxide, medical stone, shitosan.
The said alkaline matter that is adsorbed can be an organic base, comprising: triethanolamine, diethanol amine, diamine, hydrazine hydrate; Or inorganic base, comprising: sodium carbonate, sodium acid carbonate, sodium thiosulfate, NaOH, dibastic sodium phosphate, sodium dihydrogen phosphate, vulcanized sodium and potash, saleratus, potassium thiosulfate, potassium hydroxide, potassium hydrogen phosphate, potassium dihydrogen phosphate, potassium sulfide.
During preparation, choose the carrier after one or more alkali solids are handled or directly use alkali solid, after sieving, choose 10~100 purpose particles,, add in the acetate fiber by the technology of composite tip stick as carrier.
When adopting carrier, need earlier with alkaline matter with the appropriate solvent dissolving after, carrier is soaked wherein, then, filter, and the carrier after will handling removes and desolvates, wherein alkaline matter accounts for whole outer interpolation proportion of particles and is generally 5~50%.For organic base, it accounts for whole outer interpolation proportion of particles is 5~40%.Can be clamminess processing inconvenience under the concentration of too high organic base.
Further preferably carrier was toasted 3-5 hour in 150 ℃ of baking ovens.
Cigarette filter can be the two-part composite filter tip, adds the mouth end far away that particle is added on two-part mouth rod outward.Also can be the syllogic composite filter tip, add the middle cavity section that particle is added on syllogic mouth rod outward.
The filter tip that contains modifier provided by the invention has following advantage;
2, this patent can make cigarette keep its original local flavor of sucking;
3, this patent can reduce the content of hydrogen cyanide in the main flume in large quantities, and effect is obvious;
4, the manufacture craft of the described outer interpolation particle of this patent is simple, lower cost for material.
Description of drawings
Fig. 1 is each sample hydrogen cyanide absworption peak among the embodiment 1;
Fig. 2 is a standard sample standard curve map among the embodiment 1.
The specific embodiment
Embodiment 1
The inorganic alkaline particle of equal in quality different meshes reduces the effect of hydrogen cyanide
Sieve and handle the sodium carbonate solid, get 60~100 purpose particle 2000g, make the syllogic composite tip stick after adding in acetate fiber by composite tip stick technology, roll into cigarette then and get sample 2; Same processing procedure is got 10~30 purpose particle 2000g, and prepared thus cigarette is a sample 1; Any particle is not added in same technological process, and prepared thus cigarette is a blank sample 3, is listed as follows table 1.1:
Table 1.1---cigarette sample character
The outer particle total amount (mg/ props up cigarette) of adding | The outer granular size (order) of adding | Cigarette weight (g) | Cigarette props up resistance to suction (mm water column) | |
Blank 3 | 0 | / | 0.91 | 117 |
Sample 2 | 30~35 | 60~100 | 0.94 | 125 |
Sample 1 | 30~35 | 10~30 | 0.93 | 116 |
On smoking machine filtrona400, gather the cambridge filter of cigarette mainstream flue gas condensate and the absorption bottle of flue gas gas phase part, the method that detects hydrogen cyanide adopts document " Determination of HCN Content in MainstreamCigarette Smoke " CORESTA 2005 (England), the method for announcing among the SSPTPOST 24; Instrument is Continuous Flow Analysis instrument AA3; The results are shown in Figure 1.
Wherein: 1P is a signal peak, flue gas gas phase part hydrogen cyanide: 2C, 3C, 4C, 5C, 6C are standard sample, 7S, 8S, 9S are sample 2 (three parallel sample), and 10S, 11S, 12S are sample 1 (three parallel sample), and 13S, 14S, 15S are blank sample (three parallel sample); Smoke condensate part hydrogen cyanide: 16S, 17S, 18S are sample 2 (three parallel sample), and 19S, 20S, 21S are sample 1 (three parallel sample), and 22S, 23S, 24S are blank sample (three parallel sample).
Calculate the value of each sample with calibration curve method (seeing Fig. 1 .2), be exactly total flue gas gas phase part hydrogen cyanide add smoke condensate part hydrogen cyanogen main flume the content of hydrogen cyanide, the parallel sample of each sample is three, the results are shown in following table after average:
Table 1.2---the content of each sample hydrogen cyanide
Hydrogen cyanide content μ g/ props up cigarette | Reduce percentage % | |
Blank 3 | 191.04 | / |
Sample 1 | 139.79 | 26.8 |
Sample 2 | 89.71 | 53.1 |
Embodiment 2
Identical order is counted the effect of the inorganic alkaline particle reduction hydrogen cyanide of different quality.
Sieve behind the sodium carbonate solid, get 30~60 each 2000g of purpose particle, by composite tip stick technology, make the two-part composite tip stick after adding by Different Weight in acetate fiber, roll into cigarette then and get sample, it is 2.1 as follows that the sample situation sees Table:
Table 2.1---cigarette sample character
The outer particle total amount (mg/ props up cigarette) of adding | The outer granular size (order) of adding | Cigarette weight (g) | Cigarette props up resistance to suction (mm water column) | |
Blank | 0 | / | 0.91 | 117 |
Sample 1 | 15~20 | 30~60 | 0.92 | 116 |
Sample 2 | 35~40 | 30~60 | 0.93 | 117 |
Sample 3 | 55~60 | 30~60 | 0.94 | 119 |
The method that detects the processing of hydrogen cyanide and related data the results are shown in following table 2.2 with embodiment 1:
Table 2.2---the content of each sample hydrogen cyanide
Hydrogen cyanide content μ g/ props up cigarette | Reduce percentage % | |
Blank | 156.25 | / |
Sample 1 | 128.13 | 18.0% |
Sample 2 | 119.55 | 23.5% |
Sample 3 | 105.03 | 32.8% |
Embodiment 3
Inorganic alkali solution is handled the effect that different carrier gained particles reduces hydrogen cyanide.
Sieve behind the activated charcoal solid, get 30~60 purpose particle 2000g, sodium hydrate aqueous solution is sprayed onto on the active carbon, make the activated carbon granule that contains NaOH 20% after mixing, after 150 ℃ of baking ovens need toast 3-5 hour, add particle after the baking in the most excellent by composite tip stick technology, make the two-part composite tip stick, roll into cigarette then and get sample 1; Get 100 order aluminium oxide solid 2000g, sodium hydrate aqueous solution is sprayed onto on the aluminium oxide solid, make the alumina particle that contains NaOH 20% after mixing, after 150 ℃ of baking ovens need toast 3-5 hour, add particle after the baking in the most excellent by composite tip stick technology, make the two-part composite tip stick, roll into cigarette then and get sample 2.It is 3.1 as follows that the sample situation sees Table:
Table 3.1---cigarette sample character
The outer particle total amount (mg/ props up cigarette) of adding | The outer granular size (order) of adding | Cigarette weight (g) | Cigarette props up resistance to suction (mm water column) | |
Blank | 0 | / | 0.91 | 117 |
Sample 1 | 35~40 | 30~60 | 0.92 | 116 |
Sample 2 | 35~40 | 100 | 0.93 | 130 |
The method that detects the processing of hydrogen cyanide and related data the results are shown in following table 3.2 with embodiment 1:
Table 3.2---the content of each sample hydrogen cyanide
Hydrogen cyanide content μ g/ props up cigarette | Reduce percentage % | |
Blank | 174.25 | / |
Sample 1 | 104.75 | 39.9% |
Sample 2 | 86.75 | 50.2% |
Embodiment 4
Organic basic liquid handling same vehicle gained particle reduces the effect of hydrogen cyanide.
Get 100 order aluminium oxide solid 2000g, be sprayed onto the triethanolamine aqueous solution on the aluminium oxide solid and mix, after 150 ℃ of baking ovens need toast 4 hours, make the alumina particle that contains triethanolamine 20%, by composite tip stick technology the baking after particle add to the most excellent in, make the two-part composite tip stick, roll into cigarette then and get sample 1; Other gets 100 order aluminium oxide solid 2000g, directly be sprayed onto on the aluminium oxide solid and mix triethanolamine, after 150 ℃ of baking ovens need toast 4 hours, make the alumina particle that contains triethanolamine 20%, by composite tip stick technology the baking after particle add to the most excellent in, make the two-part composite tip stick, roll into cigarette then and get sample 2, it is 4.1 as follows that the sample situation sees Table:
Table 4.1---cigarette sample character
The outer particle total amount (mg/ props up cigarette) of adding | The outer granular size (order) of adding | Cigarette weight (g) | Cigarette props up resistance to suction (mm water column) | |
Blank | 0 | / | 0.91 | 115 |
Sample 1 | 35~40 | 100 | 0.93 | 130 |
Sample 2 | 35~40 | 100 | 0.93 | 131 |
The method that detects the processing of hydrogen cyanide and related data the results are shown in following table 4.2 with embodiment 1:
Table 4.2---the content of each sample hydrogen cyanide
Hydrogen cyanide content μ g/ props up cigarette | Reduce percentage % | |
Blank | 174.25 | / |
Sample 1 | 95.18 | 45.4% |
Sample 2 | 92.45 | 46.9% |
Claims (11)
1, a kind of cigarette filter that reduces hydrogen cyanide in the cigarette smoke, comprise fiber base material and the modifier that in fiber base material, adds, it is characterized in that described modifier is one or more alkali solid particles of 10~100 purposes, or be adsorbed with 10~100 purpose carriers of one or more alkaline matters; The addition of the carrier after above-mentioned alkali solid particle or the alkaline matter for processing is that 10~60mg/ props up cigarette.
2, a kind of cigarette filter that reduces hydrogen cyanide in the cigarette smoke according to claim 1 is characterized in that modifier is 30~60 orders.
3, a kind of cigarette filter that reduces hydrogen cyanide in the cigarette smoke according to claim 1 is characterized in that the modifier addition is that 15~60mg/ props up cigarette.
4,, it is characterized in that said alkali solid particle is selected from sodium carbonate, sodium acid carbonate, sodium thiosulfate, NaOH, dibastic sodium phosphate, sodium dihydrogen phosphate, vulcanized sodium and potash, saleratus, potassium thiosulfate, potassium hydroxide, potassium hydrogen phosphate, potassium dihydrogen phosphate, potassium sulfide according to the described a kind of cigarette filter that reduces hydrogen cyanide in the cigarette smoke of one of claim 1 to 3.
5,, it is characterized in that the said carrier that is adsorbed with alkaline matter is selected from carrier and comprises active carbon, aluminium oxide, medical stone, shitosan according to the described a kind of cigarette filter that reduces hydrogen cyanide in the cigarette smoke of one of claim 1 to 3.
6, according to the said a kind of cigarette filter that reduces hydrogen cyanide in the cigarette smoke of claim 5, it is characterized in that the said alkaline matter that is adsorbed can be an organic base, comprising: triethanolamine, diethanol amine, diamine, hydrazine hydrate; Or inorganic base, comprising: sodium carbonate, sodium acid carbonate, sodium thiosulfate, NaOH, dibastic sodium phosphate, sodium dihydrogen phosphate, vulcanized sodium and potash, saleratus, potassium thiosulfate, potassium hydroxide, potassium hydrogen phosphate, potassium dihydrogen phosphate, potassium sulfide.
7, a kind of cigarette filter that reduces hydrogen cyanide in the cigarette smoke according to claim 5, it is characterized in that the said carrier that is adsorbed with alkaline matter prepares as follows: after earlier alkaline matter being dissolved with appropriate solvent, carrier is soaked wherein, then, filter, and the carrier after will handling is except that desolvating.
8, a kind of cigarette filter that reduces hydrogen cyanide in the cigarette smoke according to claim 7 need toast carrier 3-5 hour at 150 ℃ of baking ovens after it is characterized in that removing by filter solvent again.
9, according to the described a kind of cigarette filter that reduces hydrogen cyanide in the cigarette smoke of one of claim 1 to 3, it is characterized in that said filter tip is the two-part composite filter tip, add the mouth end far away that particle is added on two-part mouth rod outward; Or filter tip is the syllogic composite filter tip, adds the middle cavity section that particle is added on syllogic mouth rod outward.
10,, it is characterized in that when adopting carrier alkaline matter accounts for the whole outer 5-50% that adds particle according to the described a kind of cigarette filter that reduces hydrogen cyanide in the cigarette smoke of one of claim 1 to 3.
11, the cigarette filter of hydrogen cyanide in the reduction cigarette smoke according to claim 10 is characterized in that when alkaline matter is organic base, and the organic basic material accounts for the whole outer 5-40% that adds particle.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CNA2007100353018A CN101336752A (en) | 2007-07-06 | 2007-07-06 | Filter-tip capable of reducing hydrocyanic acid in cigarette flue gas |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CNA2007100353018A CN101336752A (en) | 2007-07-06 | 2007-07-06 | Filter-tip capable of reducing hydrocyanic acid in cigarette flue gas |
Publications (1)
Publication Number | Publication Date |
---|---|
CN101336752A true CN101336752A (en) | 2009-01-07 |
Family
ID=40211038
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CNA2007100353018A Pending CN101336752A (en) | 2007-07-06 | 2007-07-06 | Filter-tip capable of reducing hydrocyanic acid in cigarette flue gas |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN101336752A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102018286A (en) * | 2010-11-30 | 2011-04-20 | 湖南中烟工业有限责任公司 | Cigarette filter additive for selectively reducing hydrocyanic acid in cigarette mainstream smoke, preparation and application |
CN102029146A (en) * | 2010-11-14 | 2011-04-27 | 中国烟草总公司郑州烟草研究院 | Water retaining material, preparation method thereof and application of water retaining material in filter rod |
CN102920020A (en) * | 2012-11-16 | 2013-02-13 | 湖南中烟工业有限责任公司 | Glucosamine loaded cigarette filter stick additive, as well as preparation and application methods thereof |
CN103393219A (en) * | 2013-08-14 | 2013-11-20 | 中国烟草总公司郑州烟草研究院 | Modified natural plant filter tip additive material capable of selectively reducing burst size of hydrogen cyanide in main stream smoke of cigarettes and preparation method of modified natural plant filter tip additive material |
CN104705788A (en) * | 2015-01-19 | 2015-06-17 | 云南中烟工业有限责任公司 | Preparing method for large-particle additive for cigarette filter |
CN105088869A (en) * | 2015-08-04 | 2015-11-25 | 浙江中烟工业有限责任公司 | Organic-inorganic nano-fiber composite paper and preparation method and application thereof |
CN105124754A (en) * | 2015-07-17 | 2015-12-09 | 云南中烟工业有限责任公司 | Non-polar spice carrying core for cigarettes and application of non-polar spice carrying core |
-
2007
- 2007-07-06 CN CNA2007100353018A patent/CN101336752A/en active Pending
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102029146A (en) * | 2010-11-14 | 2011-04-27 | 中国烟草总公司郑州烟草研究院 | Water retaining material, preparation method thereof and application of water retaining material in filter rod |
CN102029146B (en) * | 2010-11-14 | 2012-09-05 | 中国烟草总公司郑州烟草研究院 | Water retaining material, preparation method thereof and application of water retaining material in filter rod |
CN102018286A (en) * | 2010-11-30 | 2011-04-20 | 湖南中烟工业有限责任公司 | Cigarette filter additive for selectively reducing hydrocyanic acid in cigarette mainstream smoke, preparation and application |
CN102920020A (en) * | 2012-11-16 | 2013-02-13 | 湖南中烟工业有限责任公司 | Glucosamine loaded cigarette filter stick additive, as well as preparation and application methods thereof |
CN103393219A (en) * | 2013-08-14 | 2013-11-20 | 中国烟草总公司郑州烟草研究院 | Modified natural plant filter tip additive material capable of selectively reducing burst size of hydrogen cyanide in main stream smoke of cigarettes and preparation method of modified natural plant filter tip additive material |
CN103393219B (en) * | 2013-08-14 | 2014-09-24 | 中国烟草总公司郑州烟草研究院 | Modified natural plant filter tip additive material capable of selectively reducing burst size of hydrogen cyanide in main stream smoke of cigarettes and preparation method of modified natural plant filter tip additive material |
CN104705788A (en) * | 2015-01-19 | 2015-06-17 | 云南中烟工业有限责任公司 | Preparing method for large-particle additive for cigarette filter |
CN105124754A (en) * | 2015-07-17 | 2015-12-09 | 云南中烟工业有限责任公司 | Non-polar spice carrying core for cigarettes and application of non-polar spice carrying core |
CN105124754B (en) * | 2015-07-17 | 2019-06-04 | 云南中烟工业有限责任公司 | A kind of cigarette nonpolar fragrance load core and application |
CN105088869A (en) * | 2015-08-04 | 2015-11-25 | 浙江中烟工业有限责任公司 | Organic-inorganic nano-fiber composite paper and preparation method and application thereof |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN101336752A (en) | Filter-tip capable of reducing hydrocyanic acid in cigarette flue gas | |
EP2840911B1 (en) | Smoking articles | |
CN102029146B (en) | Water retaining material, preparation method thereof and application of water retaining material in filter rod | |
CN103393219B (en) | Modified natural plant filter tip additive material capable of selectively reducing burst size of hydrogen cyanide in main stream smoke of cigarettes and preparation method of modified natural plant filter tip additive material | |
CN102008125B (en) | Metal complexing material and preparation method thereof, and application of metal complexing material in cigarettes | |
CN102551203A (en) | Preparation method of adsorption-type base materials | |
CN107286275A (en) | HCN and the amino resins of crotonaldehyde release amount and its preparation method and application in selectivity reducing cigarette fume | |
CN102697182B (en) | Preparation method of filter nozzle additive for lowering ammonia in smoke of cigarette and application thereof | |
CN102987564B (en) | Cigarette filtering rod additive for reducing content of ammonia in mainstream smoke as well preparation method and application thereof | |
CN112107027B (en) | Functionalized geopolymer material for reducing hydrocyanic acid in cigarette smoke and application thereof | |
CN102972864B (en) | Preparation method of catalyst for selectively reducing released amount of hydrogen cyanide in mainstream smoke of cigarette | |
CN1080548C (en) | Biological tobacco tar reducing agent | |
JP4824568B2 (en) | Cigarette smoke filter | |
CN101992058B (en) | Mesoporous copper oxide-aluminum oxide adsorbing agent for reducing hydrogen cyanide content in main stream smoke of cigarette, and preparation and application | |
CN101194756A (en) | Application of chitosan complex for cigarette filter tip and preparation thereof | |
CN102551207B (en) | Chinese herbal additive for reducing hydrogen cyanide in main stream smoke of cigarette, preparation method and application thereof | |
CN101485494A (en) | Filtering agent for reducing content of coke tar in tobacco and preparation method thereof | |
CN214677540U (en) | Ternary composite filter tip capable of being added with harm reducing material | |
CN106758503B (en) | A kind of paper for cigarette filter tip and its preparation method and application with reduction ammonia of main stream smoke of cigarette content function | |
CN111317172B (en) | Cigarette filter stick additive capable of reducing ammonia release amount in main stream smoke of cigarette and preparation method and application thereof | |
CN103908953B (en) | A kind ofly reduce sorbing material of hydrocyanic acid release amount in flue gas and preparation method thereof | |
CN103859590B (en) | CO and the additive of cigarette filter stick of releasing content of coke tar and preparation method and application in main flume can be reduced simultaneously | |
CN102885401A (en) | Efficient cigarette filter containing nano bamboo charcoal material | |
CN102524960B (en) | A kind of preparation method of harm reduction cigarette filter | |
CN102599651B (en) | Preparation method for composite cigarette filter stick capable of reducing harmful components of cigarette |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
C06 | Publication | ||
PB01 | Publication | ||
C10 | Entry into substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20090107 |