CN111289444A - Method for determining cut stem content in cut tobacco based on color difference method - Google Patents
Method for determining cut stem content in cut tobacco based on color difference method Download PDFInfo
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention relates to a method for measuring the content of cut stems in cut tobacco in formula based on a color difference method, wherein mixed cut tobacco obtained by mixing cut stems and cut leaves is taken as cut tobacco to be measured; processing the tobacco shreds to be detected into powder to be detected with set specifications; separately determining the L of the powders to be measured*、a*、b*Value of wherein L*Is from black to white, and represents a lightness value, a*Is from green to red, represents the redness value, b*From blue to yellow, indicating the yellowness value; calculating the color difference of the tobacco shreds to be detected by using the standard brightness value, the standard redness value and the standard yellowness value of the standard sample; and calculating the content of the cut stems in the cut tobacco to be detected by utilizing a linear regression model of the content of the cut stems and the color difference of the cut tobacco to be detected. The method is simple and rapid to operate, low in cost, high in precision, good in repeatability and suitable for accurately measuring the cut stem content in the cut tobacco.
Description
Technical Field
The invention belongs to the technical field of cut tobacco detection, and particularly relates to a method for determining cut stem content in cut tobacco in a formula based on a color difference method.
Background
The cigarette formula cut tobacco generally comprises cut tobacco leaves, cut stems and reconstituted cut tobacco leaves, and the stability of the content of each component has great influence on the smoking quality of cigarette products. In recent years, cut stems play more and more important roles in reducing cigarette harmfulness, regulating and controlling cigarette smoke level, improving application efficiency of tobacco leaf raw materials and the like, and the use proportion of the cut stems in a formula and the blending uniformity of the cut stems in cigarette cigarettes are more and more emphasized. Therefore, the method for accurately measuring the cut stem content in the cut tobacco is a key for judging and evaluating the effective utilization rate and blending quality of the cut stems, and is also widely concerned by technical and quality detection personnel in the industry.
In the past, the actual proportion of cut stems in cut tobacco in a formula is usually obtained by adopting manual visual observation or selecting and weighing by means of a visual amplification system according to the difference of morphological characteristics and colors of the cut stems. Although the method is simple to operate, the method has the defects of long time consumption, large artificial influence, inapplicability to mass detection and the like.
With the continuous development of the cut stem manufacturing technology, the morphological characteristics of the produced cut stems and cut leaves have smaller and smaller differences, and the selection by artificial vision becomes increasingly difficult. In addition, the apparent densities of the cut tobacco leaves, the cut stems and the reconstituted tobacco cut tobacco are similar, so that the cut tobacco leaves, the cut stems and the reconstituted tobacco cut tobacco cannot be separated by utilizing the difference of the densities. Meanwhile, the problems of small sample discrimination and poor repeatability in the determination process caused by the problems of the test method such as the chemical component difference of the tobacco raw materials or the industrial analysis difference are not enough to achieve the purpose of accurately determining the cut stem content in the cut tobacco.
In order to solve the problem, related researchers respectively adopt a uniform design-PLS-NIR method and a thermal analysis technology to predict the cut stem content in the cut tobacco formula. However, both methods are highly demanding on instrumentation and data processing and modeling are relatively complex.
Disclosure of Invention
The invention aims to provide a method for determining the content of cut stems in cut tobacco based on a color difference method, so as to solve the problem that the content of the cut stems in the cut tobacco in the prior art is complex to determine accurately.
The invention is realized by the following technical scheme:
a method for measuring cut stem content in cut tobacco based on a color difference method comprises the following steps:
s1, selecting mixed cut tobacco mixed by cut stems and cut leaves as cut tobacco to be detected;
s2, processing the tobacco shreds to be tested into powder to be tested with set specifications;
s3, respectively measuring the L of the powder to be measured*、a*、b*Value of wherein L*Is from black to white, and represents a lightness value, a*Is from green to red, represents the redness value, b*From blue to yellow, indicating the yellowness value;
s4, calculating the color difference of the tobacco shreds to be detected by using the standard brightness value, the standard redness value and the standard yellowness value of the standard sample;
s5, calculating the cut stem content in the cut tobacco to be detected by using the linear regression model of the cut stem content and the color difference of the cut tobacco to be detected.
Further, before the step S2, a pretreatment of the tobacco shred to be tested is also included, specifically, the tobacco shred to be tested is dried in an oven at 45 ℃ for 2 hours.
Further, after the step S2, post-processing of the tobacco shred to be tested is also included, specifically, the powder to be tested is placed in a constant temperature and humidity chamber with a temperature of 22 ± 1 ℃ and a relative humidity of 60% ± 2% for balancing and setting time.
Further, the specific measurement method of step S3 includes the steps of:
1) placing a set amount of powder to be detected in a transparent container, pressing and flattening the powder to be detected to ensure that the powder to be detected does not loose and fall off after the transparent container is inverted, and then inverting the transparent container;
2) determination of the L of the powder to be measured at the bottom of the transparent container by means of a colorimeter*、a*、b*A value;
3) selecting N different positions at the bottom of the transparent container for determination, wherein N is a natural number, and automatically calculating an average value for 1 time every N continuous determinations, namely L for determination*、a*、b*The value is obtained.
Further, step S4 uses the standard lightness value L of the standard sample0Standard red value a0And a standard yellowness value b0Separately calculate △ L*、△a*And △ b*Wherein: l is*＝L*-L0，△a*＝a*-a0，△b*＝b*-b0；
The color difference deltae is calculated by means of a formula,
further, a linear regression model of the cut stem content and the color difference value of the cut tobacco to be detected is y ═ a △ E + b, wherein y is the cut stem content, △ E is the color difference, and a and b are constants.
The invention has the beneficial effects that:
according to the technical scheme, the tobacco stems and the tobacco leaves have great difference in appearance color due to great difference in content and proportion of internal chemical components such as plastid pigment and the like, and the difference can be accurately quantified and represented by using a color difference meter, so that a theoretical basis is laid for predicting the content of the cut stems in the cut tobacco in the formula by using a color difference method.
The method is simple and rapid to operate, low in cost, high in precision, good in repeatability and suitable for accurately measuring the cut stem content in the cut tobacco.
Detailed Description
The technical solutions of the present invention are described in detail below by examples, and the following examples are only exemplary and can be used only for explaining and illustrating the technical solutions of the present invention, but not for explaining the limitations of the technical solutions of the present invention.
The application provides a method for determining cut stem content in cut tobacco based on a color difference method, which comprises the following steps:
and selecting the mixed cut tobacco with specified sampling quantity as the cut tobacco to be detected according to the set sampling interval in one batch of production time. For example, the samples are sampled 1 time at intervals of 5min, 10min, 30min, etc., and each sample is 0.5kg, or other predetermined sample amounts are possible. Drying the sampled tobacco shreds to be tested in a baking oven at 45 ℃ for 2h, crushing the tobacco shreds by using a cyclone mill, sieving the tobacco shreds by using a sieve with the aperture of 250 mu m (60 meshes), and balancing the obtained sample powder in a constant temperature and humidity box with the temperature of 22 +/-1 ℃ and the relative humidity of 60 +/-2% for 48h to obtain the powder to be tested.
Placing about 10g of tobacco powder into a quartz cup, compacting and flattening the tobacco powder as much as possible by a specially-equipped sample presser to ensure that the quartz cup does not loose and fall off after inversion, slowly inverting the quartz cup, and measuring the L of the powder to be measured at the bottom of the quartz cup by using a DC-P3 type full-automatic color difference meter*、a*、b*Value (L)*Is from black to white, and represents a lightness value, a*Is from green to red, represents the redness value, b*From blue to yellow, indicating the yellowness value). Selecting 3 different positions for measuring the tobacco powder sample in each quartz cup, automatically calculating 1 average value by the colorimeter every 3 continuous measurements, and obtaining the average value L*、a*、b*The value is obtained.
Standard lightness value L using standard sample0Standard red value a0And a standard yellowness value b0Separately calculate △ L*、△a*And △ b*Wherein: l is*＝L*-L0，△a*＝a*-a0，△b*＝b*-b0；
The color difference deltae is calculated by means of a formula,
the method for obtaining the linear regression model of the stem content and the color difference value of the cut tobacco to be measured is explained in detail in a method for establishing a model for measuring the stem content in cut tobacco based on a color difference method, which is applied by the applicant on the same day.
According to the technical scheme, the tobacco stems and the tobacco leaves have great difference in appearance color due to great difference in content and proportion of internal chemical components such as plastid pigment and the like, and the difference can be accurately quantified and represented by using a color difference meter, so that a theoretical basis is laid for predicting the content of the cut stems in the cut tobacco in the formula by using a color difference method.
The method is simple and rapid to operate, low in cost, high in precision, good in repeatability and suitable for accurately measuring the cut stem content in the cut tobacco.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A method for measuring cut stem content in cut tobacco in formula based on a color difference method is characterized by comprising the following steps:
s1, selecting mixed cut tobacco mixed by cut stems and cut leaves as cut tobacco to be detected;
s2, processing the tobacco shreds to be tested into powder to be tested with set specifications;
s3, respectively measuring the L of the powder to be measured*、a*、b*Value of wherein L*Is from black to white, and represents a lightness value, a*Is from green to red, represents the redness value, b*From blue to yellow, indicating the yellowness value;
s4, calculating the color difference of the tobacco shreds to be detected by using the standard brightness value, the standard redness value and the standard yellowness value of the standard sample;
s5, calculating the cut stem content in the cut tobacco to be detected by using the linear regression model of the cut stem content and the color difference of the cut tobacco to be detected.
2. The method for determining the cut stem content in the cut tobacco formula based on the color difference method according to claim 1, wherein the step S2 is preceded by a pretreatment of the cut tobacco to be tested, specifically, the cut tobacco to be tested is dried in an oven at 45 ℃ for 2 hours.
3. The method for determining the cut stem content in the cut tobacco formula based on the color difference method according to claim 2, wherein the method further comprises a post-treatment of the cut tobacco to be tested after the step S2, specifically, the powder to be tested is placed in a constant temperature and humidity chamber with the temperature of 22 +/-1 ℃ and the relative humidity of 60% +/-2% for a balance setting time.
4. The method for determining the cut rolled stem content in the cut tobacco formula based on the color difference method according to claim 1, wherein the specific determination method in the step S3 comprises the following steps:
1) placing a set amount of powder to be detected in a transparent container, pressing and flattening the powder to be detected to ensure that the powder to be detected does not loose and fall off after the transparent container is inverted, and then inverting the transparent container;
2) determination of the L of the powder to be measured at the bottom of the transparent container by means of a colorimeter*、a*、b*A value;
3) selecting N different positions at the bottom of the transparent container for determination, wherein N is a natural number, and automatically calculating an average value for 1 time every N continuous determinations, namely L for determination*、a*、b*The value is obtained.
5. The method for determining cut rolled stem content in cut tobaccos based on color difference method according to claim 4, wherein step S4 is implemented by using standard lightness value L of standard sample0Standard red value a0And a standard yellowness value b0Separately calculate △ L*、△a*And △ b*Wherein: l is*＝L*-L0，△a*＝a*-a0，△b*＝b*-b0；
The color difference deltae is calculated by means of a formula,
6. the method for determining the cut stem content in the cut tobacco formula based on the color difference method according to claim 5, wherein a linear regression model of the cut stem content and the color difference value of the cut tobacco to be determined is y-a △ E + b, wherein y is the cut stem content, △ E is the color difference, and a and b are constants.
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