CN110726646A - Method for evaluating stability of cigarette axial density distribution - Google Patents
Method for evaluating stability of cigarette axial density distribution Download PDFInfo
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- CN110726646A CN110726646A CN201911021819.5A CN201911021819A CN110726646A CN 110726646 A CN110726646 A CN 110726646A CN 201911021819 A CN201911021819 A CN 201911021819A CN 110726646 A CN110726646 A CN 110726646A
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Abstract
A method for evaluating the stability of the axial density distribution of cigarettes is based on the axial point-by-point density distribution of the cigarettes, the point-by-point mean value, the standard deviation and the coefficient of variation are counted, and the stability of the axial density of the cigarettes is represented by establishing the average coefficient of variation, and comprises the following steps of: 1) sample pretreatment; 2) testing the axial density of the cigarette; 3) counting the mean value, standard deviation and variation coefficient of the axial density of the cigarettes point by point; 4) counting the average variation coefficient or the root-mean-square variation coefficient of the axial density of the cigarettes; 5) and (5) evaluating the stability of the axial density of different cigarette samples. The invention adopts the average variation coefficient and the root mean square variation coefficient of the cigarette dry basis density distribution to evaluate the stability of the cigarette density distribution, and can evaluate the stability of the tobacco density distribution among cigarette samples with different circumferences, different lengths, different formulas, different filter tips and different brands. The evaluation method has clear physical significance, simple and practical judgment indexes and important significance on the cigarette manufacturing stability.
Description
Technical Field
The invention belongs to the technical field of cigarette product quality detection, and particularly relates to an evaluation method for evaluating the stability of the axial density distribution of cigarette tobacco shreds.
Background
In the cigarette production process, on one hand, in order to prevent the tobacco falling of the cigarette end part and ensure the hardness of the cigarette, the density of the two ends of the tobacco shred area of the cigarette is higher than that of the middle part, so that fixed density distribution is formed; on the other hand, the axial density distribution of the filter tip is different due to the functional filter tip and the composite filter tip. The cigarette density distribution stability is one of important indexes influencing the cigarette quality, and not only influences the stability of physical indexes such as weight, hardness, suction resistance, cigarette end cut and the like of the cigarette, but also influences the release stability of harmful substances in cigarette smoke and the stability of sensory quality in the cigarette consumption process, thereby influencing the acceptance of consumers on the quality of cigarette products.
The Chinese invention patent (CN200720024015.7) provides a cigarette density microwave detection device which can detect the cigarette density without damage, but does not establish an evaluation method of the cigarette density distribution stability.
The Chinese patent of invention (CN104165822A) adopts the cigarette density variation coefficient to evaluate the uniformity of the cigarette density distribution, but the density data of the smoking dense end and the burning dense end of the cigarette are removed, and the characteristics of the cigarette tobacco density distribution can not be completely reflected.
The Chinese invention patent (CN107084995A) adopts the concept of average relative error, provides an eta evaluation index to evaluate the stability of the density distribution of tobacco shreds of cigarettes, but the method lacks clear physical meaning and is difficult to be widely applied in the actual production process.
Disclosure of Invention
The invention aims to provide a method for evaluating the stability of cigarette density distribution, aiming at the defects of the prior art. The invention comprises the following steps:
the method comprises the following steps: sample pretreatment
The cigarette sample is placed in a constant temperature and humidity environment with the temperature of 22 +/-2 ℃ and the relative humidity of 60 +/-5 percent for balancing for 48 hours.
Step two: testing cigarette axial density
And (3) measuring the axial density distribution of the N cigarettes by adopting a microwave density analyzer, wherein the measuring range is a tobacco section, and the density data of M positions of each cigarette are measured at equal intervals.
Step three: counting the mean value, standard deviation and coefficient of variation of the axial density point by point of the cigarette
According to the axial density data of N cigarettes to be tested, the point-by-point density mean value, the standard deviation and the coefficient of variation of M positions are calculated as follows
Where rhoi,jThe density of the jth position of the ith cigarette sample is shown.
Step four: counting the average variation coefficient or root mean square variation coefficient of the cigarette axial density
According to the point-by-point density variation coefficients of M positions of N cigarettes and the average value of the point-by-point density variation coefficients, the average variation coefficient or the root-mean-square variation coefficient of the axial density of the N cigarettes can be obtained, one of the two variation coefficients is selected, and the stability of the axial density of the cigarettes can be evaluated according to the size of the variation coefficient. The average coefficient of variation cva and the root mean square coefficient of variation cvs are calculated as follows.
Step five: stability of axial density of different cigarette samples in cigarette evaluation
And (3) respectively repeating the steps from one step to four for two groups or a plurality of groups of different cigarette samples, calculating the average variation coefficient or the root-mean-square variation coefficient of the axial density of the different cigarette samples, and comparing the average variation coefficient or the root-mean-square variation coefficient among the plurality of groups of cigarette samples, wherein the axial density distribution is more stable when the numerical value is smaller, and otherwise, the density distribution is more unstable.
The invention adopts the average variation coefficient and the root mean square variation coefficient of the cigarette dry basis density distribution to evaluate the stability of the cigarette density distribution, and can evaluate the stability of the tobacco density distribution among cigarette samples with different circumferences (such as common cigarettes, medium cigarettes, fine cigarettes and the like), different lengths, different formulas, different filter tips and different brands. The evaluation method has clear physical significance, simple and practical judgment indexes and important significance on the cigarette manufacturing stability.
The present invention differs from CN104165822A in that: CN104165822A is to evaluate a certain cigarette, but the method of the invention can evaluate a certain batch of sample cigarettes, and has more practical application value by averaging the axial density of a plurality of cigarettes at a certain position and then averaging the position. And the calculation formulas and methods of the two are substantially different.
Detailed Description
The invention will be further described with reference to the following examples of the operation and principles: the sample is a certain brand of cigarette in China.
The method comprises the following steps: sample pretreatment
10 cigarettes of 2 brands are respectively taken, and the cigarette samples are placed in a constant-temperature and constant-humidity environment with the temperature of 22 +/-2 ℃ and the relative humidity of 60 +/-5% for balancing for 48 hours.
Step two: testing cigarette axial density
The microwave moisture density analyzer is adopted to measure the axial density of the tobacco shreds of 2 groups of cigarettes, the tobacco shred sections are rolled in the measuring range, each 1mm of the tobacco shred sections is used for detecting density data, the first group of cigarettes has 54 cigarette data, and the second group of cigarettes has 59 cigarette data. As shown in table 1.
TABLE 1
Step three: counting the mean value, standard deviation and coefficient of variation of the axial density point by point of the cigarette
The point-by-point mean value, standard deviation and coefficient of variation were taken for the axial density data of 10 samples of each of 2 groups of cigarettes, respectively, and the obtained point-by-point mean values, standard deviations and coefficient of variation for 2 groups of cigarette samples are shown in table 2.
TABLE 2
Step four: counting the average variation coefficient of the cigarette axial density
Calculating the variation coefficient of the point-by-point density data of 2 groups of cigarette samples, and averaging the variation coefficients to obtain the average variation coefficient cv of the axial density distribution of 2 groups of cigarette samples10.055 and cv2＝0.080。
Step five: stability of axial density of different cigarette samples in cigarette evaluation
Comparing the average coefficient of variation of the axial density of the 2 groups of cigarette samples, the average coefficient of variation of the first group of cigarette samples is found to be 5.5%, and the average coefficient of variation of the second group of cigarette samples is found to be 8.0%, so that the axial density distribution of the first group of cigarette samples is more stable.
Claims (4)
1. A method for evaluating the stability of the distribution of the axial density of cigarettes is characterized by comprising the following steps: the method is based on the cigarette axial point-by-point density distribution, the point-by-point mean value, the standard deviation and the variation coefficient are counted, and the stability of the cigarette axial density is represented by establishing the average variation coefficient, and the method comprises the following specific steps:
the method comprises the following steps: sample pretreatment;
step two: testing cigarette axial density
Measuring the axial density distribution of N cigarettes by using a microwave density analyzer, wherein the measuring range is a tobacco section, and density data of M positions of each cigarette are measured at equal intervals;
step three: counting the mean value, standard deviation and coefficient of variation of the axial density point by point of the cigarette
According to the axial density data of N cigarettes to be tested, the point-by-point density mean value, the standard deviation and the coefficient of variation of M positions are calculated as follows
Where rhoi,jRepresenting the density of the jth position of the ith cigarette sample;
step four: counting the average variation coefficient or root mean square variation coefficient of the cigarette axial density
According to the point-by-point density variation coefficients of M positions of N cigarettes and the average value of the point-by-point density variation coefficients, the average variation coefficient or the root-mean-square variation coefficient of the axial density of the N cigarettes can be obtained, one of the two variation coefficients is selected, and the stability of the axial density of the cigarettes can be evaluated according to the size of the variation coefficient; the average coefficient of variation cva and the root mean square coefficient of variation cvs are calculated as follows.
Step five: stability of axial density of different cigarette samples in cigarette evaluation
And (3) respectively repeating the steps from one step to four for two groups or a plurality of groups of different cigarette samples, calculating the average variation coefficient or the root-mean-square variation coefficient of the axial density of the different cigarette samples, and comparing the average variation coefficient or the root-mean-square variation coefficient among the plurality of groups of cigarette samples, wherein the axial density distribution is more stable when the numerical value is smaller, and otherwise, the density distribution is more unstable.
2. The evaluation method according to claim 1, characterized in that: the pretreatment of the sample in the first step means that the cigarette sample is placed in a constant temperature and humidity environment with the temperature of 22 +/-2 ℃ and the relative humidity of 60 +/-5% for balancing for 48 hours.
3. The evaluation method according to claim 1, characterized in that: the method is suitable for testing and evaluating cigarettes with different sizes (such as circumference and length).
4. The evaluation method according to claim 1, characterized in that: the method can be used for evaluating the stability of the axial density distribution of a plurality of cigarettes.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112526077A (en) * | 2020-12-08 | 2021-03-19 | 福建中烟工业有限责任公司 | Tobacco blending uniformity evaluation method based on water content |
| CN112697644A (en) * | 2021-01-15 | 2021-04-23 | 江苏中烟工业有限责任公司 | Method for evaluating cigarette density measurement accuracy |
| CN113953209A (en) * | 2021-10-27 | 2022-01-21 | 云南中烟工业有限责任公司 | Cigarette nondestructive uniformity processing method |
| CN116148004A (en) * | 2022-11-29 | 2023-05-23 | 江苏中烟工业有限责任公司 | Method for evaluating consistency of axial distribution of formula tobacco shreds in cigarette and application |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104165822A (en) * | 2014-08-19 | 2014-11-26 | 云南中烟工业有限责任公司 | Method for quantitatively evaluating uniformity of cigarette density distribution |
| CN107084995A (en) * | 2017-05-18 | 2017-08-22 | 中国烟草总公司郑州烟草研究院 | A kind of quantitative evaluation method of density of tobacco rod distributing homogeneity |
| CN109146301A (en) * | 2018-08-30 | 2019-01-04 | 山东中烟工业有限责任公司 | A kind of segmented cigarette pipe tobacco distributing homogeneity evaluation method and system |
-
2019
- 2019-10-25 CN CN201911021819.5A patent/CN110726646A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104165822A (en) * | 2014-08-19 | 2014-11-26 | 云南中烟工业有限责任公司 | Method for quantitatively evaluating uniformity of cigarette density distribution |
| CN107084995A (en) * | 2017-05-18 | 2017-08-22 | 中国烟草总公司郑州烟草研究院 | A kind of quantitative evaluation method of density of tobacco rod distributing homogeneity |
| CN109146301A (en) * | 2018-08-30 | 2019-01-04 | 山东中烟工业有限责任公司 | A kind of segmented cigarette pipe tobacco distributing homogeneity evaluation method and system |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112526077A (en) * | 2020-12-08 | 2021-03-19 | 福建中烟工业有限责任公司 | Tobacco blending uniformity evaluation method based on water content |
| CN112697644A (en) * | 2021-01-15 | 2021-04-23 | 江苏中烟工业有限责任公司 | Method for evaluating cigarette density measurement accuracy |
| CN113953209A (en) * | 2021-10-27 | 2022-01-21 | 云南中烟工业有限责任公司 | Cigarette nondestructive uniformity processing method |
| CN116148004A (en) * | 2022-11-29 | 2023-05-23 | 江苏中烟工业有限责任公司 | Method for evaluating consistency of axial distribution of formula tobacco shreds in cigarette and application |
| CN116148004B (en) * | 2022-11-29 | 2024-03-26 | 江苏中烟工业有限责任公司 | Method for evaluating consistency of axial distribution of formula tobacco shreds in cigarette and application |
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