Method for selecting tobacco raw material detection sample

Abstract

The invention relates to a method for selecting a tobacco raw material detection sample, which comprises the following steps: selecting the tobacco raw material detection sample as a first-level sample, carrying out first quartering operation on the first-level sample to obtain four first-level sub-samples, numbering the four first-level sub-samples according to the sequence, namely 1, 2, 3 and 4 respectively, mixing the first-level sub-samples numbered as 1, 3 or 2 and 4, and carrying out second quartering operation on the first-level sample to obtain a second-level sub-sample; performing secondary quartering operation on any one of the secondary samples to obtain two secondary samples, performing secondary quartering operation on any one of the secondary samples to obtain four secondary sub-samples, performing analogy to obtain nth sub-samples, calculating uniformity U among the nth sub-samples, performing index detection by taking the tobacco raw material detection sample as a test sample when the uniformity U is greater than or equal to 60%, and performing index detection by taking the tobacco raw material detection sample as a test sample when the uniformity U is less than 60%. And after re-sampling, the quartering operation process is optimized until the uniformity U is greater than or equal to 60%.

Description

Technical Field

[0001] The invention relates to the field of tobacco quality index measurement, and more specifically to a method for selecting tobacco raw material testing samples. Background Art

[0002] The quartering method, also known as the artificial cone quartering method, is a method of sample reduction. It is an intermediate step in sample processing when the tobacco industry performs offline testing of tobacco raw material moisture content, filling value and other quality indicators. Through the quartering method, the large amount of tobacco raw material samples sampled is reduced by half. Through the use of the quartering method multiple times, the large amount of sampling is reduced to the amount required for testing without affecting the accuracy of the sample test results, thus achieving the feasibility and representativeness of tobacco raw material quality indicator measurement.

[0003] At present, due to the lack of standardized quartering instruments and uniformity calculation methods and evaluation systems, people often rely on experience to perform rough quartering by hand, rulers, etc., resulting in the sub-samples and grandson samples after quartering being obviously unrepresentative, and the results of precision instrument measurements are unreliable, resulting in poor measurement accuracy and a huge waste of manpower and material resources. Summary of the invention

[0004] In order to solve the above technical problems and fill the blank of the uniformity calculation method of tobacco raw material quartering method, the present invention discloses a method for selecting tobacco raw material test samples as a specific evaluation basis.

[0005] In order to achieve the above-mentioned object of the invention, the method for selecting tobacco raw material test samples of the present invention adopts the following technical scheme:

[0006] The present invention provides a method for selecting a tobacco raw material test sample. The method comprises the following steps: selecting a tobacco raw material sample of at least 4 times the mass of the tobacco raw material test sample, namely a first-level sample; performing a first quartering operation on the first-level sample to obtain four first-level sub-samples; numbering the four first-level sub-samples in order, which are 1, 2, 3 and 4 respectively; mixing the first-level sub-samples numbered 1, 3 or 2, 4 to obtain two second-level samples; performing a second quartering operation on any one of the second-level samples to obtain four second-level sub-samples; and so on and so forth; obtaining an n-level sample according to the above steps; performing an n-th quartering operation on the n-level sample to obtain four n-th level sub-samples; and stopping the above quartering operation when the mass of each n-th level sub-sample obtained is greater than 0.5 times the mass of the tobacco raw material test sample and less than 1 times the mass of the tobacco raw material test sample. The following steps are used to judge whether the tobacco raw material test sample meets the requirements:

[0007] (I) Calculate the uniformity U between the nth level sub-samples

[0008] U=[1-(α M×CV M +α D ×CV D +α F ×CV F )]×100% formula (1)

[0009] Among them, α M is the weight calibration factor,

[0010] CV M is the coefficient of variation of the quality of the nth level sub-sample, unit: %

[0011] The calculation formula is as follows:

[0012]

[0013] M1 is the mass of the nth level subsample numbered 1, in g;

[0014] M2 is the mass of the nth level subsample numbered 2, in g;

[0015] M3 is the mass of the nth level subsample numbered 3, in g;

[0016] M4 is the mass of the nth level subsample numbered 4, in g;

[0017] M0 is the mass of the remaining sample, i.e., the difference between the mass of the tobacco raw material test sample and the mass of the nth level sub-sample, in g;

[0018] M is the average mass of the nth level subsample, in g;

[0019]

[0020] Among them, α D is the calibration coefficient of the final content,

[0021] CV D is the coefficient of variation of the impurity content of the n-th level sub-sample, in %, and the calculation formula is as follows:

[0022]

[0023] D1 is the dust content of the nth level subsample numbered 1, in %;

[0024] D2 is the dust content of the nth level sub-sample No. 2, in %;

[0025] D3 is the dust content of the nth level subsample numbered 3, %;

[0026] D4 is the dust content of the nth level subsample numbered 4, in %;

[0027] D0 is the mean value of the impurity content of the remaining samples, i.e., the mean value of the impurity content of the tobacco raw material test samples excluding the nth level sub-samples, in %;

[0028] D is the average value of the impurity content of the n-th level sub-sample, in %;

[0029]

[0030] Among them, α F is the fill value calibration factor,

[0031] CV F is the coefficient of variation of the filling value of the nth level sub-sample, unit: %

[0032] The calculation formula is as follows:

[0033]

[0034] F1 is the filling value of the nth level sub-sample numbered 1, in cm 3 / g;

[0035] F2 is the filling value of the nth level sub-sample numbered 2, in cm 3 / g;

[0036] F3 is the filling value of the nth level sub-sample numbered 3, in cm 3 / g;

[0037] F4 is the filling value of the nth level sub-sample numbered 4, in cm 3 / g;

[0038] F0 is the mean filling value of the remaining samples, that is, the mean filling value of the tobacco raw material test samples excluding the nth level sub-sample, in cm 3 / g;

[0039] F is the average filling value of the nth sub-sample, in cm 3 / g

[0040]

[0041] (II) Judging the uniformity U

[0042] When the uniformity U is ≥ 60%, it indicates that the uniformity of the n-th sub-sample obtained in step (i) after quartering is good, and two n-th sub-samples No. 1 and No. 3 or No. 2 and No. 4 are fully mixed to obtain two tobacco raw material test samples, and one of the two tobacco raw material test samples is used as a test sample for index detection;

[0043] When the uniformity U is less than 60%, it indicates that the uniformity of the n-th subsample obtained in step (i) after quartering is insufficient, and it is necessary to resample and optimize the quartering process, and repeat step (i) until the uniformity U is greater than or equal to 60%.

[0044] The method for selecting tobacco raw material test samples of the present invention, wherein: the tobacco raw material test sample comprises: one of: redried tobacco strips, tobacco stems, tobacco flakes, stem shreds and tobacco shreds.

[0045] The method for selecting tobacco raw material test samples of the present invention, wherein: the four-division operation includes: the tobacco raw material four-division operation performed manually, and the tobacco raw material four-division operation performed using fully automatic, semi-automatic or manual tools.

[0046] The method for selecting tobacco raw material test samples of the present invention, wherein: the uniformity refers to the difference between the physical and chemical indicators between the nth level sub-samples, the smaller the difference, the higher the uniformity.

[0047] The method for selecting tobacco raw material test samples of the present invention, wherein: the n is an integer greater than or equal to 2.

[0048] The method for selecting tobacco raw material test samples of the present invention, wherein: the dust content is detected by a tobacco industry standard method.

[0049] The method for selecting tobacco raw material test samples of the present invention, wherein: the filling value is detected using a tobacco industry standard method.

[0050] The method for selecting tobacco raw material test samples of the present invention effectively solves the problem that the domestic and foreign tobacco industries currently lack a set of uniformity calculation methods for tobacco raw material sample quartering, and fills the gap in uniformity calculation methods for tobacco raw material quartering. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 are the four first-level subsamples obtained by the quartering method. DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The technical solutions of the present invention are further described below in conjunction with specific embodiments.

[0053] Figure 11 is the operating principle of the tobacco raw material quartering method shown in an embodiment of the present invention: the dotted line is the quartering line, and 1, 2, 3, and 4 are sub-sample 1, sub-sample 2, sub-sample 3, and sub-sample 4 respectively.

[0054] A method for selecting a tobacco raw material test sample of the present invention comprises selecting a tobacco raw material sample of at least 4 times the mass of the tobacco raw material test sample, namely, a first-level sample. For example, if 10 g of tobacco raw material test sample is to be selected, 45 g of tobacco raw material sample is taken, and the first-level sample is divided into four parts for the first time to obtain four first-level sub-samples. The four first-level sub-samples are numbered in order, and they are 1, 2, 3 and 4 respectively. The mass of the first-level sub-sample numbered 1 is 11.3 g, the mass of the first-level sub-sample numbered 2 is 11.6 g, the mass of the first-level sub-sample numbered 3 is 11.1 g, and the mass of the first-level sub-sample numbered 4 is 1 1g, the first-level sub-samples numbered 1, 3 or 2, 4 are mixed to obtain two secondary samples, and then the mass of 22.4g of the numbered 1, 3 in the above secondary samples is divided into four parts for the second time to obtain four second-level sub-samples, namely, 5.5g of the second sub-sample numbered 1, 5.7g of the second sub-sample numbered 2, 5.79g of the second sub-sample numbered 3 and 5.41g of the second sub-sample numbered 4. At this time, when the mass of the second-level sub-sample is greater than 0.5 times the mass of the tobacco raw material test sample and less than 1 times the mass of the tobacco raw material test sample, the above-mentioned quartering operation is stopped, wherein: the following steps are used to judge whether the tobacco raw material test sample meets the requirements:

[0055] (I) Calculate the uniformity U between the nth level sub-samples

[0056] 1. Weigh the mass of each sub-sample, which are M1 = 5.50g, M2 = 5.71g, M3 = 5.79g, M4 = 5.41g, and M0 = 22.59g;

[0057] The mass mean M = 5.60 g can be obtained, and two quarters were performed, that is, n = 2;

[0058] Get α M =0.9912, CV M =3.3%.

[0059] 2. Measure the dust content of each final sub-sample and the dust content of the remaining sample respectively, which are D1 = 0.62%, D2 = 0.65%, D3 = 0.73%, D4 = 0.58%, D0 = 0.61%,

[0060] The average value of the fineness content D = 0.64% can be obtained, and two quarters were performed, that is, n = 2;

[0061] Get α D =1.0574, CVD =15.78%.

[0062] 3. Measure the filling value of each final sub-sample and the filling value of the remaining samples respectively, which are F1 = 4.2 cm 3 / g, F2=4.3cm 3 / g, F3=4.2cm 3 / g, F4=4.4cm 3 / g, F0=4.2cm 3 / g;

[0063] The average filling value F = 4.27 cm 3 / g;

[0064] Get α F =1.0179, CV F =2.2%.

[0065] (II) Judging the uniformity U

[0066] The calculated uniformity U value is U = 1-(0.9912×3.3%+1.0474×15.78%+1.0179×2.2%) = 77.65%

[0067] When the uniformity U is ≥ 60%, it indicates that the uniformity of the n-th level subsample obtained in step (i) after quartering is good, and after the two n-th level subsamples No. 1 and No. 3 or No. 2 and No. 4 are fully mixed, a tobacco raw material test sample is selected from the two n-th level subsamples, and the tobacco raw material test sample is used as a test sample for index detection;

[0068] When the uniformity U is less than 60%, it indicates that the uniformity of the n-th subsample obtained in step (i) after quartering is insufficient, and it is necessary to resample and optimize the quartering process, and repeat step (i) until the uniformity U is greater than or equal to 60%.

[0069] The method for selecting tobacco raw material test samples of the present invention, wherein: the tobacco raw material test sample comprises: one of: redried tobacco strips, tobacco stems, tobacco flakes, stem shreds and tobacco shreds.

[0070] The four-division operation includes: the tobacco raw material four-division operation performed manually, and the tobacco raw material four-division operation performed using fully automatic, semi-automatic or manual tools. Uniformity refers to the difference between the physical and chemical indicators of the n-th level sub-samples. The smaller the difference, the higher the uniformity.

[0071] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A method for selecting a tobacco raw material test sample, wherein a tobacco raw material sample having a mass at least 4 times that of the tobacco raw material test sample is selected as a first-level sample, the first-level sample is subjected to a first quartering operation to obtain four first-level sub-samples, the four first-level sub-samples are numbered in order, and they are 1, 2, 3 and 4 respectively, the first-level sub-samples numbered 1, 3 or 2, 4 are mixed to obtain two second-level samples, and any one of the second-level samples is subjected to a second quartering operation to obtain four second-level sub-samples, and so on, according to the above steps, an n-level sample is obtained, the n-level sample is subjected to an n-th quartering operation to obtain four n-th-level sub-samples, and when the mass of each n-th-level sub-sample obtained is greater than 0.5 times the mass of the tobacco raw material test sample and less than 1 times the mass of the tobacco raw material test sample, the above-mentioned quartering operation is stopped, characterized in that: Use the following steps to determine whether the tobacco raw material test sample meets the requirements: (I) Calculate the uniformity U between the nth level sub-samples U = [1 - (α M × CV M + α D × CV D + α F × CV F )] × 100% Formula (1) Among them, α M is the weight calibration factor, CV M is the coefficient of variation of the quality of the nth level sub-sample, unit: % The calculation formula is as follows: M1 is the mass of the nth level subsample numbered 1, in g; M2 is the mass of the nth level subsample numbered 2, in g; M3 is the mass of the nth level subsample numbered 3, in g; M4 is the mass of the nth level subsample numbered 4, in g; M0 is the mass of the remaining sample, i.e., the difference between the mass of the tobacco raw material test sample and the mass of the nth level sub-sample, in g; M is the average mass of the nth level subsample, in g; Among them, α D is the calibration coefficient of the final content, CV D is the coefficient of variation of the impurity content of the n-th level sub-sample, in %, and the calculation formula is as follows: D1 is the dust content of the nth level subsample numbered 1, in %; D2 is the dust content of the nth level sub-sample No. 2, in %; D3 is the dust content of the nth level subsample numbered 3, %; D4 is the dust content of the nth level subsample numbered 4, in %; D0 is the mean value of the impurity content of the remaining samples, i.e., the mean value of the impurity content of the tobacco raw material test samples excluding the nth level sub-samples, in %; D is the average value of the impurity content of the n-th level sub-sample, in %; Among them, α F is the fill value calibration factor, CV F is the coefficient of variation of the filling value of the nth level sub-sample, unit: % The calculation formula is as follows: F1 is the filling value of the nth level sub-sample numbered 1, in cm 3 / g; F2 is the filling value of the nth level sub-sample numbered 2, in cm 3 / g; F3 is the filling value of the nth level sub-sample numbered 3, in cm 3 / g; F4 is the filling value of the nth level sub-sample numbered 4, in cm 3 / g; F0 is the mean filling value of the remaining samples, that is, the mean filling value of the tobacco raw material test samples excluding the nth level sub-sample, in cm 3 / g; F is the average filling value of the nth sub-sample, in cm 3 / g (II) Judging the uniformity U When the uniformity U is ≥ 60%, it indicates that the uniformity of the n-th sub-sample obtained in step (i) after quartering is good, and two n-th sub-samples No. 1 and No. 3 or No. 2 and No. 4 are fully mixed to obtain two tobacco raw material test samples, and one of the two tobacco raw material test samples is used as a test sample for index detection; When the uniformity U is less than 60%, it indicates that the uniformity of the n-th subsample obtained in step (i) after quartering is insufficient, and it is necessary to resample and optimize the quartering process, and repeat step (i) until the uniformity U is greater than or equal to 60%.

2. The method for selecting tobacco raw material test samples according to claim 1, characterized in that: The tobacco raw material test sample comprises: one of: redried tobacco strips, tobacco stems, tobacco flakes, stem shreds and tobacco shreds.

3. The method for selecting tobacco raw material test samples according to claim 2, characterized in that: The four-division operation includes: the tobacco raw material four-division operation performed manually, and the tobacco raw material four-division operation performed using fully automatic, semi-automatic or manual tools.

4. The method for selecting tobacco raw material test samples according to claim 3, characterized in that: The uniformity refers to the difference between the physical and chemical indicators of the n-th level sub-samples. The smaller the difference, the higher the uniformity.

5. The method for selecting tobacco raw material test samples according to claim 4, characterized in that: The n is an integer greater than or equal to 2.

6. The method for selecting tobacco raw material test samples according to claim 5, characterized in that: The dust content is determined using tobacco industry standard methods.

7. The method for selecting tobacco raw material test samples according to claim 6, characterized in that: The fill value is determined using tobacco industry standard methods.

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