CN102338725A - Method for measuring humidity maintaining performance of cigarettes and specific constant temperature and constant humidity determinator - Google Patents
Method for measuring humidity maintaining performance of cigarettes and specific constant temperature and constant humidity determinator Download PDFInfo
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- CN102338725A CN102338725A CN2010102353014A CN201010235301A CN102338725A CN 102338725 A CN102338725 A CN 102338725A CN 2010102353014 A CN2010102353014 A CN 2010102353014A CN 201010235301 A CN201010235301 A CN 201010235301A CN 102338725 A CN102338725 A CN 102338725A
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 235000019504 cigarettes Nutrition 0.000 title claims abstract description 28
- 238000012360 testing method Methods 0.000 claims abstract description 54
- 206010016807 Fluid retention Diseases 0.000 claims abstract description 18
- 238000005303 weighing Methods 0.000 claims abstract description 9
- 238000007789 sealing Methods 0.000 claims abstract description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 8
- 238000003556 assay Methods 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 3
- 238000000643 oven drying Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims description 2
- 229920003023 plastic Polymers 0.000 claims description 2
- 239000000523 sample Substances 0.000 description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 241000208125 Nicotiana Species 0.000 description 8
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 239000012153 distilled water Substances 0.000 description 6
- 238000011056 performance test Methods 0.000 description 5
- 238000011160 research Methods 0.000 description 5
- 238000010998 test method Methods 0.000 description 5
- 239000003906 humectant Substances 0.000 description 4
- 208000004350 Strabismus Diseases 0.000 description 3
- 230000018044 dehydration Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 238000010533 azeotropic distillation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000011005 laboratory method Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000010076 replication Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 235000011149 sulphuric acid Nutrition 0.000 description 1
- 239000001117 sulphuric acid Substances 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
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Abstract
Belonging to the technical field of cigarette tests, the invention discloses a method for measuring a humidity maintaining performance of cigarettes and a specific constant temperature and humidity determinator. The method for measuring the humidity maintaining performance of cigarettes adopts the constant temperature and humidity determinator. A sample and a weighing device are placed inside a constant temperature and humidity box, and are operated by sealed nested operation gloves, so that water-retention rates of the sample to be measured at different time periods and under different conditions can be obtained, and furthermore the humidity maintaining performance of cigarettes can be determined. In front of the determinator box, an air-tight door that can be opened and closed and has a see-through window is arranged; the air-tight door is provided with two cavities, and the ends of a pair of operation gloves extended into the box are connected to the cavities through sealing structures; the inside of the box is equipped with a meshed object stage, on which a built-in electronic balance is installed. With simple and rapid operation and stable working measuring equipment, the measuring method of the invention can generate authentic and reliable moisture content data.
Description
Technical field
The invention belongs to the cigarette test technical field, be specifically related to a kind of the assay method of cigarette humectation performance and specific constant temperature and humidity analyzer thereof.
Background technology
In the prior art, cigarette flavouring humectation performance has become further raising Chinese style cigarette interior quality, has strengthened the important breakthrough mouth and the gordian technique of Chinese style cigarette core competitiveness, is asserted the great special project of tobacco business science and technology by State Tobacco Monopoly Bureau.Each cigarette industry enterprise also pays close attention to more the cigarette humectation and payes attention to, and various fundamental researchs relevant with the cigarette humectation and applied research launch successively.But early-stage Study finds that in the research process of cigarette humectation, how accurately, easily the problem that at first faces is the test and evaluation that carries out the humectation performance.The humectation performance of tobacco humectant is meant the environment at low humidity or high humidity, and cigarette is at the regulating power that prevents moisture loss or inhibition moisture absorption.Estimating the good and bad of humectant humectation performance mainly judges with the variable quantity of certain hour inner wrap strip water percentage.Tobacco humectation performance test runs through whole research process, is the basis of cigarette humectation technical research, therefore sets up the rational tobacco humectation performance test methods of a cover and shows important and urgent especially.At present a lot of about the humectation performance test methods of humectant on tobacco, modal is conventional oven for drying method, is about to spray the sample that adds humectant and puts into climatic chamber, and sampling regularly, oven dry are estimated the humectation effect through the water percentage situation of change; Also have testing sample is put into sulphuric acid desiccator, and sampling regularly; Also have in addition through azeotropic distillation method and measure the pipe tobacco water percentage, these method ubiquities that test period is longer, and method of testing is loaded down with trivial details, and the result is not accurate enough, problems such as poor reproducibility.
1. GB: moisture analysis, the shortcoming of the method is a complicated operation, destroys sample, workload is big;
2. thermostatic box method, the method need open, close casing operates, constant temperature subenvironment that can the disturbance casing;
3. exsiccator method, as 2 identical, switch box is known from experience the subenvironment of disturbance casing, and after sulfuric acid solution absorbed moisture, concentration can change, and humidity also changes thereupon;
4. thermostatic box and exsiccator associated methods, the method still needs the switch casing, and disturbance exists equally;
5. constant temperature and humidity laboratory method, the method investment is huge, because personnel's turnover is the disturbance experiments room environmental, and the control difficulty is big, operating cost is huge.
Above method all can't obtain the true and reliable moisture of sample.
Summary of the invention
Above-mentioned deficiency to prior art; The technical matters that the present invention will solve provides a kind of method of cigarette humectation performance and specific constant temperature and humidity analyzer thereof measured; Set up a kind of humectation performance measurement method of science; Also create a kind of ribbon gymnastics simultaneously and make the constant temperature and humidity analyzer of gloves and built-in electronic balance, can obtain the true and reliable moisture of sample, for further raising Chinese style cigarette interior quality, enhancing Chinese style cigarette core competitiveness have been created basic condition.
Technical scheme of the present invention is: the constant temperature and humidity analyzer that the mensuration described in the method for mensuration cigarette humectation performance adopts specially designed ribbon gymnastics to make gloves and built-in electronic balance carries out; Described constant temperature and humidity analyzer is built in sample and meausring apparatus in the constant temperature and humidity casing, through the inner cased type operation gloves operation sample of sealing and the instrument of weighing; Described assay method carries out by following operation successively:
(1) set the humiture value of the Temperature and Humidity Control display (7) of analyzer, the start operation makes that humiture reaches setting value and constant in the analyzer;
(2) open airtight chamber door (2), testing sample is positioned on the built-in objective table (3), close airtight chamber door (2), and make that humiture remains on setting value in the analyzer;
(3) every at a distance from a setting-up time section, through operation gloves (6), testing sample is positioned over built-in electronic balance (4) goes up weighing, record weighing value;
(4) be calculated as follows the water retention (testing sample survey before quality adopt oven drying method to measure) of testing sample:
In the formula: W-water retention, %;
Quality before the survey of G-testing sample and sample box, the g of unit, quality adopted oven drying method to measure before testing sample was surveyed,
G
0-testing sample box quality, the g of unit,
The testing sample that recorded in Gn-n hour and the quality of sample box, the g of unit,
Obtain the water retention of testing sample under the different time sections different condition, according to the size of water retention and then judge the humectation performance of cigarette, the cigarette that water retention is higher, its humectation better performances, otherwise its humectation poor-performing then.
The constant temperature and humidity analyzer that ribbon gymnastics is made gloves and built-in electronic balance contains climatic chamber and control system thereof, and the casing of described climatic chamber seals, and the casing front is provided with the hermatic door that has perspective window of ability open-close; Hermatic door is provided with two cavities, and a pair of not end that stretches to the operation gloves in the casing is connected through hermetically-sealed construction with the cavity; Be provided with the objective table of band mesh in the casing, objective table is provided with the built-in electronic balance.
Described operator cover is provided with large, medium and small specification and model, and gloves are processed with rubber or plastics class gas impermeable material.Also be provided with built-in hygrometer in the described casing.Also be provided with the sulfuric acid solution drawer in the described casing.
The invention has the beneficial effects as follows; When measuring, the present invention need not open and close the moisture that casing (casing in humiture can keep constant) can working sample; Assay method is simple and efficient to handle, and it is stable to measure equipment, and the moisture data that obtain sample are true and reliable.
Description of drawings
Accompanying drawing 1 is a constant temperature and humidity analyzer structural representation of the present invention;
Relative humidity (RH) scatter diagram when accompanying drawing 2 is analyzer dry runs of the present invention;
Relative humidity (RH) scatter diagram when accompanying drawing 3 is common climatic chamber dry runs;
Accompanying drawing 4 is that analyzer of the present invention is at extraneous humidity 75 ± 5% o'clock relative temperature scatter diagram;
Accompanying drawing 6 is that analyzer of the present invention is at extraneous humidity 35 ± 5% o'clock relative temperature scatter diagram;
Accompanying drawing 8 is that common climatic chamber is measured repeatedly reproducible results figure of cigarette humectation performance;
Accompanying drawing 9 is that analyzer of the present invention is measured repeatedly reproducible results figure of cigarette humectation performance.
The accompanying drawing acceptance of the bid is kept the score and stated as follows: 1-has the hermatic door of perspective window; The 2-hermetically-sealed construction; 3-operates gloves; 4-sulfuric acid solution drawer; 5-built-in electronic balance; The built-in hygrometer of 6-; The 7-objective table; 8-Temperature and Humidity Control display; The 9-casing; The 10-cavity.
Embodiment
Be described in further detail below in conjunction with accompanying drawing specific embodiments of the invention and relevant technologies problem.The applicant tests each item performance of this analyzer; And with common climatic chamber done comparative tests; The moisture fluctuation scope was-4.1%～+ 4.4% when the result showed common climatic chamber dry run, and the moisture fluctuation scope was-1.7%～+ 1.8% when ribbon gymnastics of the present invention was done the constant temperature and humidity analyzer dry run of gloves and built-in electronic balance; The operation of the shutter door of common climatic chamber has strengthened the casing moisture fluctuation, and extraneous humidity squints on the casing humidity when being higher than the casing setting value, and extraneous humidity is lower than when offseting setting value, squints under the casing humidity.There is significant difference in the test result that adopts F check common climatic chamber of demonstration and ribbon gymnastics of the present invention to make the constant temperature and humidity analyzer of gloves and built-in electronic balance; The coefficient of variation of common climatic chamber is 1.01%, and the coefficient of variation that ribbon gymnastics of the present invention is made the constant temperature and humidity analyzer of gloves and built-in electronic balance is 0.39%.Therefore ribbon gymnastics of the present invention is made the test precision height of the constant temperature and humidity analyzer of gloves and built-in electronic balance, and the constant temperature and humidity analyzer that adopts method of the present invention and adopt ribbon gymnastics to make gloves and built-in electronic balance carries out the humectation performance test, and more science is reliable.
Be further described with regard to this equipment and method of testing below.
Relative humidity fluctuation contrast test when 1, ribbon gymnastics of the present invention is done the constant temperature and humidity analyzer dry run of gloves and built-in electronic balance
HygroPalm-AW1 relative humidity instrument probe is placed 22 ℃ of temperature, the relative humidity fluctuation when the common climatic chamber of relative humidity 60% and ribbon gymnastics of the present invention are done the constant temperature and humidity analyzer dry run of gloves and built-in electronic balance.Relative humidity reading of every 12h record, continuous recording 168h.Revision test has been carried out in relative humidity fluctuation in the casing 6 times during above-mentioned test climatic chamber dry run.
Every 12h measures the relative humidity of a casing during common climatic chamber dry run, continuous coverage 168h, and the result sees Fig. 2, Fig. 3.What loose the some expression among the figure is 6 humidity values in the repeated test, and what straight line was represented is the 60% casing relative humidity of setting.As can be seen from Figure 3, the ambient humidity of common climatic chamber control is not a definite value, but is centered around fluctuation up and down in the setting value certain limit.Setting relative humidity is 60% o'clock; The relative humidity fluctuation range that test records common climatic chamber is-4.1%～+ 4.4%, and Fig. 2 shows that it is-1.7%～+ 1.8% that ribbon gymnastics of the present invention is made the relative humidity fluctuation range of the constant temperature and humidity analyzer of gloves and built-in electronic balance.The relative humidity fluctuating range of common climatic chamber is about 2 times of constant temperature and humidity analyzer that ribbon gymnastics of the present invention is made gloves and built-in electronic balance.Ambient humidity is the principal element that influences the test specimen change of soil water content; It is big more that humidity departs from setting value; The test result that then obtains departs from true value more; It is less that ribbon gymnastics of the present invention is made the moisture fluctuation amplitude of constant temperature and humidity analyzer of gloves and built-in electronic balance, and the more common climatic chamber accuracy of test result is high.
Influence when 2, extraneous humiture is done constant temperature and humidity analyzer and the plain type climatic chamber running of gloves and built-in electronic balance to ribbon gymnastics of the present invention
Common climatic chamber needs to open and close chamber door in trial run; Different breadboard humitures is different to the influence of the humiture in the casing; In order to study the influence of external environment to casing relative humidity in the test; 1. this test and Selection tests 22 ± 1 ℃ of ambient temperatures under two kinds of external environments, humidity 75 ± 5% is 22 ± 1 ℃ of ambient temperatures 2., humidity 35 ± 5%; This breadboard temperature can be controlled at 22 ℃ by air-conditioning, and humidity is chosen under the specific overcast and rainy and dry weather natural conditions carries out.
The result sees Fig. 4, Fig. 5, the relative humidity fluctuation of climatic chamber in the expression trial run.What loose the some expression among Fig. 5,7 is the relative humidity in the common constant temperature and humidity box body; What loose the some expression among Fig. 4,6 is the interior relative humidity of constant temperature and humidity analyzer casing that ribbon gymnastics of the present invention is made gloves and built-in electronic balance, and what straight line was represented is relative humidity in 60% casing of setting.
Comparison diagram 4-Fig. 7 finds that external environment changes, and the relative humidity fluctuation tendency of constant temperature and humidity analyzer that ribbon gymnastics of the present invention is made gloves and built-in electronic balance is constant basically, and fluctuation range is respectively-1.4%～+ 1.8% and-1.4%～+ 1.9%.This is need not open and close chamber door in test because ribbon gymnastics of the present invention is made the constant temperature and humidity analyzer of gloves and built-in electronic balance, has avoided the disturbance of external environment.Common climatic chamber need open and close chamber door in test, and different external environments is different to the influence of casing humidity.When extraneous humidity was higher than casing humidity, the actual measurement high humidity of casing partly was in the top of setting value, and humidity is skew upwards, and when extraneous humidity was lower than casing humidity, casing actual measurement high humidity partly was in the setting value below, and humidity squints downwards.The fluctuation range of common climatic chamber is respectively-4.1%～+ 5.2% and-4.7%～+ 4.1% in the test, and fluctuating range increases during than dry run.This is all to cause the exchange of casing inner air and outer air owing to whenever open a chamber door; Cause the rapid rising or the reduction of humidity in the casing; Will start dehumidifying or humidification program detect the variation of humidity when the control system of climatic chamber after, the humidity in the casing is regulated.After regulating through vibration repeatedly, the humidity in the casing just can reach plateau.Therefore, it is more stable that ribbon gymnastics of the present invention is made the experimental enviroment of constant temperature and humidity analyzer of gloves and built-in electronic balance, and method of testing is more reliable.
3, the humectation performance test methods is to significance test when
Common climatic chamber method of testing: the ad-hoc location that HygroPalm-AW1 relative humidity instrument probe is placed climatic chamber; Set 22 ℃ of the temperature of climatic chamber, relative humidity 60%, treat that the relative humidity reading reaches steady state (SS) after; Accurately take by weighing 3 parts of 30g distilled water (parallel appearance) respectively in advance in the sample box that oven dry is weighed; It is moved near the relative humidity appearance in the common climatic chamber, and every the taking-up at a distance from 1h weighed once, and the door time of unpacking is controlled in the 30s; Continuous 12h, the moisture of test distilled water is situation of change in time.Unpack gate test sample preface picture recording to the hygronom reading, measure the relative humidity fluctuation of casing in trial run, be calculated as follows the water retention of sample.
In the formula: W-water retention, %;
The quality of G-distilled water and sample box, g
G
0-sample box quality, g
Gn-n hour distilled water and sample box quality, g
Ribbon gymnastics of the present invention is made the constant temperature and humidity analyzer method of testing of gloves and built-in electronic balance: electronic balance is placed in the glove-type climatic chamber of 22 ℃ of temperature, relative humidity 60%; The experimental procedure of setting by the present invention makes an experiment; When weighing sample, in casing, accomplish the door of not unpacking in the process of the test through the gloves hole.Test the relative humidity fluctuation of climatic chamber simultaneously.
Above test result is seen Fig. 8; Fig. 9 can find out from the single test curve, along with the prolongation of time; The distilled water water retention lowers gradually; The water retention curve that common climatic chamber records has tangible flex point, and the pipe tobacco dehydration curve of this point and bibliographical information is consistent, and fluctuation has by a relatively large margin appearred in the interpret sample moisture loss.It is comparatively level and smooth that ribbon gymnastics of the present invention is made the water retention curve that the constant temperature and humidity analyzer of gloves and built-in electronic balance records, and explained that the dehydration process of distilled water is very steady.This shows that the fluctuation of ambient humidity can exert an influence to sample dehydration trend.Can find out that from 6 revision test curves each curve point that records of common climatic chamber is more discrete, each curve point that the glove-type climatic chamber records is more concentrated, and the latter's test repetitiveness has been described.
Significance test: precision is meant under the same conditions the degree that n replication result is consistent each other; The size of precision has been reacted the repeatability of test, water retention The data during to terminal point 12h the F check judge the precision of the test result of common climatic chamber and glove-type climatic chamber.The result sees table 1
The water retention tables of data of each revision test 12h of table 1
Table:
The F check:
1. suppose H
0: σ
1 2=σ
2 2
2. compute statistics
3. given level of significance α=0.05, F tables look-up
0.95(5,5)=5.05
4. statistical inference
Because F=6.48＞5.05=F
0.95(5,5) so the population variance of two kinds of methods is inconsistent, that is to say that two kinds of methods have significant difference.Can know from table 1 and above Mathematical Statistics Analysis; The precision of common climatic chamber and the test of glove-type climatic chamber is inconsistent; The coefficient of variation of common climatic chamber is 1.01%, and the coefficient of variation of analyzer of the present invention is 0.39%, and the precision of analyzer of the present invention is apparently higher than the former.
Claims (5)
1. method of measuring cigarette humectation performance; It is characterized in that: the constant temperature and humidity analyzer that described mensuration adopts specially designed ribbon gymnastics to make gloves and built-in electronic balance carries out; Described constant temperature and humidity analyzer is built in sample and meausring apparatus in the constant temperature and humidity casing, through the inner cased type operation gloves operation sample of sealing and the instrument of weighing; Described assay method carries out by following operation successively:
(1) set the humiture value of the Temperature and Humidity Control display (7) of analyzer, the start operation makes that humiture reaches setting value and constant in the analyzer;
(2) open airtight chamber door (2), testing sample is positioned on the built-in objective table (3), close airtight chamber door (2), and make that humiture remains on setting value in the analyzer;
(3) every at a distance from a setting-up time section, through operation gloves (6), testing sample is positioned over built-in electronic balance (4) goes up weighing, record weighing value;
(4) be calculated as follows the water retention of testing sample:
In the formula: W-water retention, %;
Quality before the survey of G-testing sample and sample box, the g of unit, quality adopted oven drying method to measure before testing sample was surveyed,
G
0-testing sample box quality, the g of unit,
The testing sample that recorded in Gn-n hour and the quality of sample box, the g of unit,
Obtain the water retention of testing sample under the different time sections different condition, according to the size of water retention and then judge the humectation performance of cigarette, the cigarette that water retention is higher, its humectation better performances, otherwise its humectation poor-performing then.
2. a ribbon gymnastics is made the constant temperature and humidity analyzer of gloves and built-in electronic balance; Contain climatic chamber and control system thereof; It is characterized in that: the casing of described climatic chamber (9) seals, and casing (9) front is provided with the hermatic door that has perspective window (1) of ability open-close; Hermatic door (1) is provided with two cavities (10), and a pair of not end that stretches to the operation gloves (3) in the casing is connected through hermetically-sealed construction (2) with cavity (10); Be provided with the objective table (7) of band mesh in the casing (9), objective table (7) is provided with built-in electronic balance (5).
3. ribbon gymnastics according to claim 2 is made the constant temperature and humidity analyzer of gloves and built-in electronic balance, it is characterized in that: described operation gloves (3) are provided with large, medium and small all size and model, and gloves are processed with rubber or plastics class gas impermeable material.
4. ribbon gymnastics according to claim 2 is made the constant temperature and humidity analyzer of gloves and built-in electronic balance, it is characterized in that: also be provided with built-in hygrometer (6) in the described casing (9).
5. ribbon gymnastics according to claim 2 is made the constant temperature and humidity analyzer of gloves and built-in electronic balance, it is characterized in that: also be provided with sulfuric acid solution drawer (4) in the described casing (9).
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| CN2010102353014A CN102338725A (en) | 2010-07-20 | 2010-07-20 | Method for measuring humidity maintaining performance of cigarettes and specific constant temperature and constant humidity determinator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102353014A CN102338725A (en) | 2010-07-20 | 2010-07-20 | Method for measuring humidity maintaining performance of cigarettes and specific constant temperature and constant humidity determinator |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103776720A (en) * | 2014-02-14 | 2014-05-07 | 江苏中烟工业有限责任公司 | Evaluation method for moisture keeping performance of cigarette raw materials |
| CN103994908A (en) * | 2014-05-26 | 2014-08-20 | 中国矿业大学(北京) | Method for accurately preparing experiment test samples with different water contents |
| CN104089830A (en) * | 2014-07-04 | 2014-10-08 | 宁波信泰机械有限公司 | High/low-temperature durable double-door testing machine for measuring automotive water cut long-term compressive load |
| CN105921184A (en) * | 2016-06-20 | 2016-09-07 | 广东电网有限责任公司电力科学研究院 | Constant temperature and constant humidity test box for coating RTV |
| CN106706466A (en) * | 2017-01-20 | 2017-05-24 | 广西卓能新能源科技有限公司 | Testing device for solid content of lithium ion battery component |
| CN108225999A (en) * | 2016-12-22 | 2018-06-29 | 贵州中烟工业有限责任公司 | A kind of method for controlling the total ventilation rate of cigarette |
| CN109030153A (en) * | 2018-10-15 | 2018-12-18 | 中国烟草总公司郑州烟草研究院 | A kind of wind speed is controllably used to adjust the device and method of cigarette moisture content |
| CN110426263A (en) * | 2019-09-05 | 2019-11-08 | 中国烟草总公司郑州烟草研究院 | A kind of cigarette balance regulator and method |
| CN110509314A (en) * | 2019-08-16 | 2019-11-29 | 南京博森科技有限公司 | High-accuracy laboratory with constant temperature and constant humidity unit |
| CN112858081A (en) * | 2020-12-21 | 2021-05-28 | 西安航天化学动力有限公司 | Device and method for testing water absorbability of propellant raw materials |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103776720A (en) * | 2014-02-14 | 2014-05-07 | 江苏中烟工业有限责任公司 | Evaluation method for moisture keeping performance of cigarette raw materials |
| CN103994908A (en) * | 2014-05-26 | 2014-08-20 | 中国矿业大学(北京) | Method for accurately preparing experiment test samples with different water contents |
| CN104089830A (en) * | 2014-07-04 | 2014-10-08 | 宁波信泰机械有限公司 | High/low-temperature durable double-door testing machine for measuring automotive water cut long-term compressive load |
| CN105921184A (en) * | 2016-06-20 | 2016-09-07 | 广东电网有限责任公司电力科学研究院 | Constant temperature and constant humidity test box for coating RTV |
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| CN106706466A (en) * | 2017-01-20 | 2017-05-24 | 广西卓能新能源科技有限公司 | Testing device for solid content of lithium ion battery component |
| CN109030153A (en) * | 2018-10-15 | 2018-12-18 | 中国烟草总公司郑州烟草研究院 | A kind of wind speed is controllably used to adjust the device and method of cigarette moisture content |
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Application publication date: 20120201 |