WO2012128281A1 - Apparent density measuring method - Google Patents

Apparent density measuring method Download PDF

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WO2012128281A1
WO2012128281A1 PCT/JP2012/057170 JP2012057170W WO2012128281A1 WO 2012128281 A1 WO2012128281 A1 WO 2012128281A1 JP 2012057170 W JP2012057170 W JP 2012057170W WO 2012128281 A1 WO2012128281 A1 WO 2012128281A1
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apparent density
calibration curve
sample
measurement
measured
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PCT/JP2012/057170
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French (fr)
Japanese (ja)
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則男 勝山
弘 湯浅
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日本たばこ産業株式会社
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • 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
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N21/359—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using near infrared light
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • 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
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/4738—Diffuse reflection, e.g. also for testing fluids, fibrous materials
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • 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
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N21/3563—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing solids; Preparation of samples therefor

Definitions

  • the present invention relates to a method for measuring the apparent density of cigarettes, and more particularly to a method for measuring the apparent density of cigarettes using near infrared spectroscopy.
  • leaf tobacco When designing cigarettes (cigarettes), it is necessary to consider the various chemical and physical properties of leaf tobacco.
  • One of the physical characteristics of leaf tobacco is the apparent density of tobacco. Apparent density is used to estimate the airflow resistance and winding hardness of cigarettes. Therefore, the apparent density of tobacco is an indispensable element in product design.
  • near-infrared spectroscopy which irradiates a sample with near-infrared light and measures its transmission absorption spectrum, diffuse reflection spectrum, etc., is non-destructive and can be measured quickly, so it is widely used in various fields. ing.
  • JP 2001-17084 A Japanese Patent Publication “JP 2000-74828 A (published March 14, 2000)”
  • chopped leaf tobacco is conditioned by a measuring instrument after being conditioned for 2 days until it reaches equilibrium in a conditioned room strictly controlled at a constant temperature and humidity. Furthermore, in order to obtain an accurate measurement value, it is common to repeat measurement at least three times and to express the average. That is, the measurement of the apparent density so far takes a great deal of labor and time.
  • the conventional method for measuring the apparent density uses mercury, which is a poison. Therefore, there is a problem that measures for preventing exposure are required to measure the apparent density.
  • an object of the present invention is to provide a method capable of measuring the apparent density of tobacco without performing complicated operations.
  • the present inventors have found that the apparent density of tobacco can be measured using near-infrared spectroscopy, and have completed the present invention.
  • an apparent density measuring method includes a step of irradiating a powdered or engraved sample of a tobacco raw material with near infrared rays and measuring a transmission absorption spectrum or a diffuse reflection spectrum, and a measurement. And calculating an apparent density estimated value from a calibration curve prepared in advance using the transmitted absorption spectrum or diffuse reflection spectrum.
  • the apparent density of the tobacco can be measured quickly without performing complicated work and without using mercury as a poisonous substance.
  • the definition of the apparent density by the conventional measurement method is as follows.
  • the apparent density is a physical characteristic amount expressed in units of “g / cm 3 ”. Specifically, the apparent density is determined after harmonizing for 2 days until it reaches equilibrium in a conditioned room that is strictly controlled at a constant temperature (22 ⁇ 2.0 ° C) and a constant humidity (60 ⁇ 5.0% RH).
  • the definition of the apparent density by the conventional measurement method is as follows.
  • the method for measuring the apparent density includes a step of irradiating a sample of a tobacco raw material in powder form or engraved form with near infrared rays to measure a transmission absorption spectrum or diffuse reflection spectrum, and a measured transmission absorption spectrum or diffusion.
  • a method for measuring an apparent density of a tobacco raw material comprising a step of calculating an apparent density estimated value from a calibration curve prepared in advance using a reflection spectrum.
  • near infrared spectrum the transmission absorption spectrum and diffuse reflection spectrum by near infrared irradiation are referred to as “near infrared spectrum”.
  • the form of the tobacco raw material that can be used as a sample to which the measurement method of the present invention is applied is a cut form or a powder form, and preferably a powder form.
  • the measuring method of this invention can be used also about samples, such as a lamina form (deboned leaf part) and a sheet piece form.
  • the tobacco material sample may be in the same form as the tobacco material sample used when the calibration curve was created. From the viewpoint of improving the uniformity of the sample, it is preferable that the sample is in the form of a powder (powder) obtained by pulverizing tobacco with a pulverizer. The measurement accuracy can be further improved by increasing the uniformity of the sample.
  • measurement is usually performed using powder. Therefore, when the measurement sample is powder, the sample for content component analysis can be used as it is for the apparent density measurement. Alternatively, the sample used for the apparent density measurement can be used as it is in other content component analysis.
  • the near-infrared ray irradiated to the tobacco raw material sample when measuring the apparent density unknown sample is in the wavelength region of 800 nm to 2500 nm, and includes at least a specific wavelength used when calculating the apparent density from the calibration curve. Just do it.
  • a near-infrared spectrometer (NIR) generally used for near-infrared spectroscopy can be used.
  • wavelengths used for the actual apparent density measurement from the measured near-infrared spectrum differs depending on the tobacco raw material and raw material type or calibration curve. Which wavelength is used for the apparent density measurement can be determined by a calibration curve creation method described later. For example, when the apparent density is measured using the estimation formula A5 in Example 1 described later, at least wavelengths near 1160.0 nm, 1420.5 nm, 1495.0 nm, 1963.5 nm, and 2428.5 nm. It suffices if near infrared rays are irradiated. When the calibration curve is obtained by PLS (Partial Least Squares) regression analysis, all wavelengths used for PLS regression analysis are used for apparent density measurement by near infrared spectroscopy.
  • PLS Partial Least Squares
  • Measurement methods for other items using near infrared spectroscopy for example, nicotine measurement using near infrared spectroscopy, leaf chemical measurement using near infrared spectroscopy, etc. are known. If the wavelength used for the measurement is included, the other items can be measured simultaneously with the apparent density.
  • the calibration curve used to calculate the apparent density in the measurement method according to the present invention is created by multivariate analysis using near-infrared spectra of samples of a plurality of tobacco raw materials whose apparent density is known. Preferably there is. Therefore, when the calibration curve does not exist, in the measurement method according to the present invention, after measuring the near-infrared spectrum of a plurality of samples of tobacco raw materials whose apparent density is known, the calibration curve is obtained by multivariate analysis. It is preferable to further include a step of creating.
  • MLR multivariate analysis
  • PLS Partial Least (Squares) regression analysis
  • principal component regression analysis principal component regression analysis
  • Fourier transform analysis can be used, among which multiple regression analysis and PLS regression Analysis is preferred.
  • the number of samples of a plurality of tobacco raw materials with known apparent densities that are used to create a calibration curve is preferably 30 samples or more, and more preferably 70 samples or more. Since the accuracy of the calibration curve increases as the number of samples increases, the upper limit is not limited, and may be, for example, 2000 samples or less, but may be more.
  • a tobacco raw material whose apparent density is known refers to a tobacco raw material whose apparent density is measured by a conventional measuring method.
  • the conventional measurement method is to chop the leaf tobacco and harmonize it for 2 days until it becomes balanced in a conditioned room strictly adjusted to 22 ⁇ 2.0 ° C and 60 ⁇ 5.0% RH. In the same room, the apparent density is measured. In order to obtain an accurate measurement value, it is common to repeat measurement at least three times and obtain the average. In addition, about 30 minutes per sample are required for the measurement by the apparent density measuring device.
  • the measurement principle is as follows: 1) First, the pycnometer is fully filled with mercury and the weight (H) is measured.
  • the wavelength region of the near-infrared spectrum for creating the calibration curve may be appropriately selected, and is, for example, 800 nm to 2500 nm. However, it is not limited to this wavelength region, and may be a narrower wavelength region.
  • the near-infrared spectrum can be measured by scanning every arbitrary wavelength interval within the above wavelength range, for example, every 0.5 nm.
  • a near-infrared light that has been spectrally separated into monochromatic light with respect to a sample of a tobacco raw material having a known apparent density is distributed within a certain wavelength region (for example, 800 nm to 2500 nm) at regular intervals (for example, 0.5 nm intervals). ). Since near infrared transmission and / or diffuse reflection occurs in the sample, the intensity of monochromatic light not absorbed by the sample is measured by a detector. The spectrum of the absorption intensity at each wavelength in the sample is displayed from the difference from the reference intensity measured in advance, and the displayed spectrum information is acquired as data.
  • a certain wavelength region for example, 800 nm to 2500 nm
  • regular intervals for example, 0.5 nm intervals
  • the above-described processing is performed on a plurality of samples, preferably 30 samples or more, thereby acquiring a plurality of pieces of spectral information data.
  • About each data after measuring a transmission absorption spectrum or a diffuse reflection spectrum, these are converted into a secondary differential spectrum.
  • Principal component analysis is performed using the obtained secondary differential spectrum and the apparent density measured using the conventional measurement method, and the principal component (main wavelength) contributing to the objective variable (apparent density) is selected.
  • a calibration curve is created by performing multivariate analysis such as multiple regression analysis and PLS regression analysis.
  • this calibration curve can be used from the next measurement, and the step of creating a calibration curve is not necessary.
  • a transmission absorption spectrum is measured using a plurality of types of tobacco raw materials such as yellow, Burley, Orient, and native species, and a single calibration curve is created using them, different types are used.
  • the apparent density of a sample of tobacco material can be measured using a common calibration curve.
  • the processing is not complicated compared to the conventional measuring method, and the measurement can be completed in a short time (about 1/20). No need to use mercury, a poisonous substance. Moreover, the measurement result obtained has a high correlation with the result obtained by the conventional measurement method.
  • Example 1 Apparent density measurement of yellow species
  • the transmission absorption spectrum was measured at 0.5 nm intervals in the near infrared wavelength region of 800 to 2500 nm.
  • a calibration curve preparation sample is packed in a quartz vial (29 mm diameter), and after being compressed with a dedicated tool, a near-infrared spectrometer (model: XM-1100, manufactured by FOSS NIRSystems) is used.
  • the near-infrared ray was irradiated from the bottom of the vial, the near-infrared ray reflected for each wavelength was detected, and the transmission absorption spectrum was measured from the difference from the reference intensity.
  • the coefficient of determination (R 2 ) was 0.6274 to 0.8162, and the standard error was 0.0313 to 0.0441.
  • FIG. 1 shows the relationship between the apparent density obtained by the conventional measuring method and the apparent density estimated value obtained by the near-infrared spectroscopy using the estimation formula (A5) for each calibration curve preparation sample. ("CAL" in FIG. 1).
  • Example 2 Measurement of apparent density of Burley species
  • a calibration curve was created by multiple regression analysis in the same manner as in Example 1 except that the calibration curve creation sample was 92 samples of domestic and foreign tobacco burley species.
  • the following estimation formulas (B1) to (B5) could be obtained.
  • Y obtained by the following estimation formula is an estimated value of the apparent density.
  • K (1) to K (5) indicate the absorbances at wavelengths of 1455.0 nm, 1221.5 nm, 218.5 nm, 2315.0 nm, and 1266.0 nm, which were differentiated after the spectrum measurement, respectively.
  • the coefficient of determination (R 2 ) was 0.6217 to 0.8555, and the standard error was 0.0202 to 0.0319.
  • FIG. 2 shows the relationship between the apparent density obtained by the conventional measuring method and the apparent density estimated value obtained by the near-infrared spectroscopy using the estimation formula (B5) for each calibration curve preparation sample. ("CAL" in FIG. 2).
  • Example 3 Apparent density measurement of Orient species
  • a calibration curve was prepared by multiple regression analysis in the same manner as in Example 1 except that 71 samples of domestic and foreign tobacco orientation species were used as the calibration curve preparation sample.
  • the following estimation formulas (C1) to (C5) could be obtained.
  • Y obtained by the following estimation formula is an estimated value of the apparent density.
  • K (1) to K (5) indicate the absorbances at wavelengths of 2037.5 nm, 1492.5 nm, 1952.5 nm, 1721.0 nm, and 2159.0 nm, which were differentiated after the spectrum measurement, respectively.
  • the coefficient of determination (R 2 ) was 0.5769 to 0.6956, and the standard error was 0.0236 to 0.0270.
  • FIG. 3 shows the relationship between the apparent density obtained by the conventional measurement method and the apparent density estimated value obtained by the near-infrared spectroscopy using the estimation formula (C5) for each calibration curve preparation sample. ("CAL" in FIG. 3).
  • Example 4 Apparent density measurement of yellow, Burley and Orient species
  • a calibration curve was prepared by multiple regression analysis in the same manner as in Example 1 except that the calibration curve preparation sample was 187 samples of tobacco yellow species, 92 samples of Burley species and 71 samples of Orient species, for a total of 350 samples.
  • the following estimation formulas (D1) to (D5) could be obtained.
  • Y obtained by the following estimation formula is an estimated value of the apparent density.
  • K (1) to K (5) indicate absorbances at wavelengths of 1653.5 nm, 1730.0 nm, 1498.5 nm, 1910.0 nm, and 2319.5 nm, respectively, which were differentiated after the spectrum measurement.
  • the coefficient of determination (R 2 ) was 0.6867 to 0.8159, and the standard error was 0.0314 to 0.0407.
  • FIG. 4 shows the relationship between the apparent density obtained by the conventional measuring method and the apparent density estimated value obtained by the near infrared spectroscopy using the estimation formula (D5) for each calibration curve preparation sample. ("CAL" in FIG. 4).
  • the transmission absorption spectrum was measured, and the yellow species 59 samples were measured using the absorbance at the wavelengths 1498.5 nm, 1653.5 nm, 1730.0 nm, 1910.0 nm, and 2319.5 nm and the estimation formula (D5) that were differentiated after the spectrum measurement. Apparent density estimates were calculated for 26 samples of Burley species and 23 samples of Orient species.
  • the apparent density obtained by the conventional measurement method and the apparent density obtained by the near infrared spectroscopy are used. There was a high correlation with the density estimate. That is, even if the tobacco materials in the measurement sample are different, the apparent density of the tobacco can be accurately measured using a common calibration curve.
  • Example 5 Apparent density measurement of yellow, Burley, Orient and native species using PLS regression analysis
  • the calibration curve preparation samples were 307 samples of domestic and foreign tobacco yellow species 138 samples, Burley species 123 samples, Orient species 31 samples, and 15 native species 15 samples, respectively, and the transmission absorption spectrum was obtained in the same manner as in Example 1. Was measured.
  • the correlation between the measured transmission absorption spectrum and the apparent density measured by the conventional method was analyzed using PLS regression analysis. Specifically, using the statistical processing software built in the near-infrared spectrometer, each transmission absorption spectrum is spectrally converted by the second derivative method, and after performing principal component analysis, a calibration curve is obtained by PLS regression analysis. Created. As a result, a calibration curve having a practically sufficient correlation with a coefficient of determination (R 2 ) of 0.9055 was obtained.
  • FIG. 5 shows the relationship between the apparent density obtained by the conventional measurement method and the estimated value of the apparent density obtained by the near-infrared spectroscopy using the estimation formula for each calibration curve preparation sample (see FIG. 5). 5) "CAL").
  • Absorption spectrum is measured every 0.5 nm within a wavelength range of 800 nm to 2500 nm, and using the estimation formula obtained above, 50 samples of yellow species, 44 samples of Burley species, 11 samples of Orient species and 5 samples of conventional species The estimated value of the apparent density was calculated for a total of 110 samples.
  • Example 6 Apparent density measurement using yellow, Burley, Orient, and native seeds using PLS regression analysis
  • the calibration curve preparation samples were 644 samples of domestic and foreign tobacco yellow species 290 samples, Burley species 226 samples, Orient species 64 sumps and 64 native species 64 samples. Was measured. However, for the measurement, the tobacco itself was used instead of the powdered sample.
  • the correlation between the measured transmission absorption spectrum and the apparent density measured by the conventional method was analyzed by PLS regression analysis using the same method as in Example 5. As a result, a calibration curve having a practically sufficient correlation with a determination coefficient (R 2 ) of 0.7518 was obtained.
  • FIG. 6 shows the relationship between the apparent density value obtained by the conventional measurement method and the estimated value of the apparent density obtained by the near-infrared spectroscopy using the estimation formula for each calibration curve preparation sample ( “CAL” in FIG. 6).
  • CAL the estimation formula for each calibration curve preparation sample
  • An absorption spectrum is measured every 0.5 nm within a wavelength range of 800 to 2500 nm, and using the estimation formula obtained above, 95 yellow samples, 74 Burley species, 21 Orient species, and 21 native species are used. Apparent density estimated values were calculated for a total of 211 samples.
  • the present invention can be used for the design and manufacture of cigarettes.

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Abstract

In order to provide a method for measuring the apparent density of raw material tobacco without carrying out complicated operations, the present invention is characterised by comprising: a process in which near-infrared rays are irradiated on a sample of raw material tobacco which is in a powdered form or a shredded form and the transmission/absorption spectrum or the diffused reflection spectrum is measured; and a process in which the measured transmission/absorption spectrum or diffused reflection spectrum is used to calculate an estimated value for the apparent density from a pre-created calibration curve.

Description

見掛密度測定方法Apparent density measurement method
　本発明は、たばこ刻の見掛密度を測定する方法に関し、詳細には近赤外分光法を利用してたばこ刻の見掛密度を測定する方法に関する。 The present invention relates to a method for measuring the apparent density of cigarettes, and more particularly to a method for measuring the apparent density of cigarettes using near infrared spectroscopy.
　シガレット（紙巻きたばこ）の製品設計にあたっては、葉たばこの種々の化学特性および物理特性を考慮する必要がある。葉たばこの物理特性の一つとしてたばこ刻の見掛密度がある。見掛密度は紙巻きたばこにおける通気抵抗や巻き硬さを推定するために用いられる。したがって、たばこ刻の見掛密度は、製品設計上不可欠な要素である。 When designing cigarettes (cigarettes), it is necessary to consider the various chemical and physical properties of leaf tobacco. One of the physical characteristics of leaf tobacco is the apparent density of tobacco. Apparent density is used to estimate the airflow resistance and winding hardness of cigarettes. Therefore, the apparent density of tobacco is an indispensable element in product design.
　ところで、試料に近赤外線を照射し、その透過吸収スペクトルや拡散反射スペクトルなどを測定する近赤外分光法は、非破壊かつ迅速にその測定が可能であることから、様々な分野において広く利用されている。 By the way, near-infrared spectroscopy, which irradiates a sample with near-infrared light and measures its transmission absorption spectrum, diffuse reflection spectrum, etc., is non-destructive and can be measured quickly, so it is widely used in various fields. ing.
日本国公開特許公報「特開２００１－１７０８４号公報（２００１年１月２３日公開）」Japanese Patent Publication “JP 2001-17084 A” (published on January 23, 2001) 日本国公開特許公報「特開２０００－７４８２８号公報（２０００年３月１４日公開）」Japanese Patent Publication “JP 2000-74828 A (published March 14, 2000)”
　従来の見掛密度の測定方法では、刻状にした葉たばこを、一定温度および一定湿度に厳密に調節された調和室で平衡状態になるまで２日間調和した後に、測定器により測定している。さらに、正確な測定値を得るためには最低３回繰り返し測定し、その平均で表すのが一般的である。すなわち、これまでの見掛密度の測定では、非常に多くの手間および時間がかかってしまう。 In the conventional method of measuring apparent density, chopped leaf tobacco is conditioned by a measuring instrument after being conditioned for 2 days until it reaches equilibrium in a conditioned room strictly controlled at a constant temperature and humidity. Furthermore, in order to obtain an accurate measurement value, it is common to repeat measurement at least three times and to express the average. That is, the measurement of the apparent density so far takes a great deal of labor and time.
　また、従来の見掛密度の測定方法では、毒物である水銀を用いている。そのため、見掛密度を測定するために被爆防止対策が必要となるという問題がある。 In addition, the conventional method for measuring the apparent density uses mercury, which is a poison. Therefore, there is a problem that measures for preventing exposure are required to measure the apparent density.
　一方、葉たばこの特性の測定に近赤外分光法を利用している従来の技術は、たばこ刻または葉中の化学物質（灰分、全揮発性酸または塩基、ニコチン、全糖、全窒素、カリウム、塩素、還元糖、および有機物等）を測定するものである。葉たばこの物理特性の測定に利用する例は知られておらず、また葉たばこの物理特性の測定に利用できるか否かについて知られていない。 On the other hand, conventional techniques that use near-infrared spectroscopy to measure the properties of tobacco are chemicals in tobacco or leaves (ash, total volatile acids or bases, nicotine, total sugar, total nitrogen, potassium , Chlorine, reducing sugar, organic substances, etc.). There is no known example used for measuring the physical characteristics of leaf tobacco, and it is not known whether it can be used for measuring the physical characteristics of leaf tobacco.
　そこで、本発明は上記の問題点に鑑みてなされたものであり、その目的は、煩雑な作業を行うことなくたばこ刻の見掛密度を測定することができる方法を提供することにある。 Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a method capable of measuring the apparent density of tobacco without performing complicated operations.
　本発明者らは、上記課題に鑑み鋭意検討した結果、近赤外分光法を利用してたばこ刻の見掛密度を測定できることを見出し、本発明を完成するに至った。 As a result of intensive studies in view of the above problems, the present inventors have found that the apparent density of tobacco can be measured using near-infrared spectroscopy, and have completed the present invention.
　本発明に係る見掛密度測定方法は、上記課題を解決するために、たばこ原料の粉末形態または刻形態の試料に近赤外線を照射し、透過吸収スペクトルまたは拡散反射スペクトルを測定する工程と、測定された上記透過吸収スペクトルまたは上記拡散反射スペクトルを用いて、予め作成された検量線から見掛密度推定値を算出する工程とを含むことを特徴とする。 In order to solve the above problems, an apparent density measuring method according to the present invention includes a step of irradiating a powdered or engraved sample of a tobacco raw material with near infrared rays and measuring a transmission absorption spectrum or a diffuse reflection spectrum, and a measurement. And calculating an apparent density estimated value from a calibration curve prepared in advance using the transmitted absorption spectrum or diffuse reflection spectrum.
　本発明に係る見掛密度の測定方法によれば、煩雑な作業を行うことなく迅速に、かつ毒物である水銀を用いることなく、たばこ刻の見掛密度を測定することができる。 According to the method for measuring the apparent density according to the present invention, the apparent density of the tobacco can be measured quickly without performing complicated work and without using mercury as a poisonous substance.
重回帰分析を行い作成した検量線を用いて近赤外分光法により測定した見掛密度と、従来の測定方法により測定した見掛密度との相関を示す図である。It is a figure which shows the correlation with the apparent density measured by the near-infrared spectroscopy using the calibration curve created by performing multiple regression analysis, and the apparent density measured by the conventional measuring method. 重回帰分析を行い作成した検量線を用いて近赤外分光法により測定した見掛密度と、従来の測定方法により測定した見掛密度との相関を示す図である。It is a figure which shows the correlation with the apparent density measured by the near-infrared spectroscopy using the calibration curve created by performing multiple regression analysis, and the apparent density measured by the conventional measuring method. 重回帰分析を行い作成した検量線を用いて近赤外分光法により測定した見掛密度と、従来の測定方法により測定した見掛密度との相関を示す図である。It is a figure which shows the correlation with the apparent density measured by the near-infrared spectroscopy using the calibration curve created by performing multiple regression analysis, and the apparent density measured by the conventional measuring method. 重回帰分析を行い作成した検量線を用いて近赤外分光法により測定した見掛密度と、従来の測定方法により測定した見掛密度との相関を示す図である。It is a figure which shows the correlation with the apparent density measured by the near-infrared spectroscopy using the calibration curve created by performing multiple regression analysis, and the apparent density measured by the conventional measuring method. ＰＬＳ回帰分析を行い作成した検量線を用いて近赤外分光法により測定した見掛密度と、従来の測定方法により測定した見掛密度との相関を示す図である。It is a figure which shows the correlation of the apparent density measured by the near-infrared spectroscopy using the calibration curve created by performing PLS regression analysis, and the apparent density measured by the conventional measuring method. 刻形態の試料を用いてＰＬＳ回帰分析を行い作成した検量線を用いて近赤外分光法により測定した見掛密度と、従来の測定方法により測定した見掛密度との相関を示す図である。It is a figure which shows the correlation with the apparent density measured by the near-infrared spectroscopy using the calibration curve created by performing the PLS regression analysis using the sample of an engraving form, and the apparent density measured by the conventional measuring method. .
　従来の測定法による見掛密度の定義は以下の通りである。 The definition of the apparent density by the conventional measurement method is as follows.
　見掛密度は、「ｇ／ｃｍ３」の単位で表される物理特性量である。詳細には、見掛密度とは一定温度（２２±２．０℃）および一定湿度（６０±５．０％ＲＨ）に厳密に調節された調和室で平衡状態になるまで２日間調和した後、一定重量（ｇ）の刻に対する刻間空隙を除いた仮密度である（ｇ／ｃｍ３）である。従来の測定法による見掛密度の定義は以下の通りである。
見掛密度（ｇ／ｃｍ３）＝Ｗ×１３．５４／（Ｈ－Ｈｗ＋Ｗ）
Ｈ：ピクノメータと呼ばれる容器に水銀を満杯に充填したときの重量（ｇ）
Ｗ：測定試料の重量（ｇ）
Ｈｗ：試料が投入されたピクノメータに水銀を満杯に充填したときの重量（ｇ）。 The apparent density is a physical characteristic amount expressed in units of “g / cm 3 ”. Specifically, the apparent density is determined after harmonizing for 2 days until it reaches equilibrium in a conditioned room that is strictly controlled at a constant temperature (22 ± 2.0 ° C) and a constant humidity (60 ± 5.0% RH). The temporary density (g / cm 3 ) excluding the interstices for the constant weight (g). The definition of the apparent density by the conventional measurement method is as follows.
Apparent density (g / cm 3 ) = W × 13.54 / (H−Hw + W)
H: Weight when a container called a pycnometer is fully filled with mercury (g)
W: Weight of measurement sample (g)
Hw: Weight (g) when the pycnometer charged with the sample is fully filled with mercury.
　本発明に係る見掛密度の測定方法の一実施形態について説明すれば以下の通りである。 An embodiment of the apparent density measuring method according to the present invention will be described as follows.
　本発明に係る見掛密度の測定方法は、たばこ原料の粉末形態または刻形態の試料に近赤外線を照射し、透過吸収スペクトルまたは拡散反射スペクトルを測定する工程と、測定された透過吸収スペクトルまたは拡散反射スペクトルを用いて、予め作成された検量線から見掛密度推定値を算出する工程とを含むことを特徴とするたばこ原料の見掛密度測定方法である。 The method for measuring the apparent density according to the present invention includes a step of irradiating a sample of a tobacco raw material in powder form or engraved form with near infrared rays to measure a transmission absorption spectrum or diffuse reflection spectrum, and a measured transmission absorption spectrum or diffusion. A method for measuring an apparent density of a tobacco raw material, comprising a step of calculating an apparent density estimated value from a calibration curve prepared in advance using a reflection spectrum.
　以下、近赤外線照射による透過吸収スペクトルおよび拡散反射スペクトルのことを「近赤外スペクトル」と称する。 Hereinafter, the transmission absorption spectrum and diffuse reflection spectrum by near infrared irradiation are referred to as “near infrared spectrum”.
　本発明の測定方法が適用される試料として使用できるたばこ原料の形態は、刻形態または粉末形態であり、なかでも粉末形態であることが好ましい。なお、本発明の測定方法は、ラミナ形態（除骨葉部分）およびシート片形態等の試料についても使用することができる。 The form of the tobacco raw material that can be used as a sample to which the measurement method of the present invention is applied is a cut form or a powder form, and preferably a powder form. In addition, the measuring method of this invention can be used also about samples, such as a lamina form (deboned leaf part) and a sheet piece form.
　測定に用いられるたばこ原料および原料のタイプに制限はなく、黄色種、バーレー種、オリエント種または在来種等のたばこ刻、シートタバコおよび緩和刻（膨化処理した刻）等、従来紙巻きたばこに用いられている任意の原料および原料タイプについて測定することができる。 There are no restrictions on the raw materials used and the type of raw materials used in the measurement. Conventionally used for cigarettes such as cigarettes such as yellow, Burley, oriental, or native species, sheet cigarettes, and tempered (expanded) It can be measured for any raw material and raw material type that is being used.
　測定に用いる試料の水分調整は特に必要ではなく、６～１３％の水分含量であれば測定できる。そのため、本測定方法の使用にあたっては、後述する従来の測定方法のような厳密な水分調整を必要としない。 It is not particularly necessary to adjust the moisture content of the sample used for the measurement, and it can be measured if the moisture content is 6 to 13%. Therefore, the use of this measurement method does not require strict moisture adjustment unlike the conventional measurement method described later.
　本発明に係る測定方法において、たばこ原料の試料は、検量線を作成したときに用いられたたばこ原料の試料と同一形態であればよい。試料の均一性を高める観点からは、たばこ刻を粉砕機で粉状にした粉末形態の試料（粉体）であることが好ましい。試料の均一性を高くすることにより、測定の精度をより向上させることができる。なお、葉たばこの内容成分分析においては、通常、紛体を用いて測定を行っている。そのため、測定試料を粉体とする場合には、内容成分分析用の試料をそのまま見掛密度の測定に利用することができる。あるいは、見掛密度の測定に用いた試料をそのまま他の内容成分分析において利用することができる。 In the measurement method according to the present invention, the tobacco material sample may be in the same form as the tobacco material sample used when the calibration curve was created. From the viewpoint of improving the uniformity of the sample, it is preferable that the sample is in the form of a powder (powder) obtained by pulverizing tobacco with a pulverizer. The measurement accuracy can be further improved by increasing the uniformity of the sample. In the content analysis of leaf tobacco, measurement is usually performed using powder. Therefore, when the measurement sample is powder, the sample for content component analysis can be used as it is for the apparent density measurement. Alternatively, the sample used for the apparent density measurement can be used as it is in other content component analysis.
　見掛密度未知試料の測定に際してたばこ原料の試料に照射する近赤外線は、８００ｎｍ～２５００ｎｍの波長領域であり、少なくとも、検量線から見掛密度を算出する際に用いられる特定の波長が含まれていればよい。スペクトルの測定には、近赤外分光法に一般的に用いられている近赤外分光測定装置（ＮＩＲ）を用いることができる。 The near-infrared ray irradiated to the tobacco raw material sample when measuring the apparent density unknown sample is in the wavelength region of 800 nm to 2500 nm, and includes at least a specific wavelength used when calculating the apparent density from the calibration curve. Just do it. For the measurement of the spectrum, a near-infrared spectrometer (NIR) generally used for near-infrared spectroscopy can be used.
　測定された近赤外スペクトルからどの波長を実際の見掛密度測定に用いるかは、たばこ原料および原料タイプまたは検量線により異なるものである。どの波長を見掛密度の測定に用いるかは、後述する検量線の作成手法により決定することができる。例えば、後述する実施例１における推定式Ａ５を利用して、見掛密度を測定する場合には、少なくとも波長１１６０．０ｎｍ、１４２０．５ｎｍ、１４９５．０ｎｍ、１９６３．５ｎｍ、および２４２８．５ｎｍ付近の近赤外線が照射されていればよい。なお、検量線がＰＬＳ（Partial Least Squares）回帰分析により得られたものである場合には、ＰＬＳ回帰分析に利用したすべての波長を近赤外分光法による見掛密度の測定に利用する。 ∙ Which wavelength is used for the actual apparent density measurement from the measured near-infrared spectrum differs depending on the tobacco raw material and raw material type or calibration curve. Which wavelength is used for the apparent density measurement can be determined by a calibration curve creation method described later. For example, when the apparent density is measured using the estimation formula A5 in Example 1 described later, at least wavelengths near 1160.0 nm, 1420.5 nm, 1495.0 nm, 1963.5 nm, and 2428.5 nm. It suffices if near infrared rays are irradiated. When the calibration curve is obtained by PLS (Partial Least Squares) regression analysis, all wavelengths used for PLS regression analysis are used for apparent density measurement by near infrared spectroscopy.
　近赤外分光法を利用した他の項目の測定法（例えば、近赤外分光法を利用したニコチンの測定法、近赤外分光法を利用した葉中化学物質の測定法等）が知られている場合に、当該測定に用いられる波長を含めておくことにより、見掛密度の測定と同時に、当該他の項目の測定も行うことができる。 Measurement methods for other items using near infrared spectroscopy (for example, nicotine measurement using near infrared spectroscopy, leaf chemical measurement using near infrared spectroscopy, etc.) are known. If the wavelength used for the measurement is included, the other items can be measured simultaneously with the apparent density.
　本発明に係る測定方法において見掛密度の算出に用いられる検量線は、見掛密度が既知である複数のたばこ原料の試料の近赤外スペクトルを用いて、多変量解析によって作成されたものであることが好ましい。そのため、当該検量線が存在しない場合には、本発明に係る測定方法において、見掛密度が既知である複数のたばこ原料の試料の近赤外スペクトルを測定後、多変量解析によって上記検量線を作成する工程をさらに含むことが好ましい。 The calibration curve used to calculate the apparent density in the measurement method according to the present invention is created by multivariate analysis using near-infrared spectra of samples of a plurality of tobacco raw materials whose apparent density is known. Preferably there is. Therefore, when the calibration curve does not exist, in the measurement method according to the present invention, after measuring the near-infrared spectrum of a plurality of samples of tobacco raw materials whose apparent density is known, the calibration curve is obtained by multivariate analysis. It is preferable to further include a step of creating.
　多変量解析としては、重回帰分析（ＭＬＲ：Multiple Linear Regression）、ＰＬＳ（Partial Least Squares）回帰分析、主成分回帰分析、およびフーリエ変換解析を利用することができ、中でも、重回帰分析およびＰＬＳ回帰分析が好ましい。 For multivariate analysis, multiple regression analysis (MLR), PLS (Partial Least （Squares) regression analysis, principal component regression analysis, and Fourier transform analysis can be used, among which multiple regression analysis and PLS regression Analysis is preferred.
　検量線を作成するために用いられる、見掛密度が既知である複数のたばこ原料の試料の数としては、３０サンプル以上であることが好ましく、７０サンプル以上であることがより好ましい。サンプル数が多いほど検量線の精度が高まるため、上限に制限はなく、例えば、２０００サンプル以下であり得るが、それ以上であってもよい。 The number of samples of a plurality of tobacco raw materials with known apparent densities that are used to create a calibration curve is preferably 30 samples or more, and more preferably 70 samples or more. Since the accuracy of the calibration curve increases as the number of samples increases, the upper limit is not limited, and may be, for example, 2000 samples or less, but may be more.
　本明細書において、「見掛密度が既知であるたばこ原料」とは、従来の測定方法により見掛密度を測定したたばこ原料のことを指す。従来の測定方法は、葉たばこを裁刻し、刻状にしたたばこを、２２±２．０℃、６０±５．０％ＲＨに厳密に調節された調和室で平衡状態になるまで２日間調和し、同室内にて見掛密度測定装置により測定するものである。正確な測定値を得るために、最低３回繰り返し測定して、その平均を取得する方法が一般的である。なお、見掛密度測定装置による測定には、１サンプルあたり３０分程度要する。なお、測定原理としては、１）ピクノメータに先ず水銀を満杯に充填し、重量（Ｈ）を測定する。２）１～２ｇの測定試料を秤量（Ｗ）し、空のピクノメータに投入する。３）測定試料が投入されたピクノメータに水銀を満杯に充填し、重量（Ｈｗ）を測定する。４）以下の算出式により見掛密度を求める。
見掛密度（ｇ／ｃｍ３）＝Ｗ×１３．５４／（Ｈ－Ｈｗ＋Ｗ）
　検量線を作成するための近赤外スペクトルの波長領域は、適宜選択すればよく、例えば８００ｎｍ～２５００ｎｍである。しかしながらこの波長領域に限定されるものではなく、より狭い波長領域であってもよい。また、近赤外スペクトルは、上記波長範囲内で任意の一定波長間隔毎、例えば０．５ｎｍ毎に走査して測定することができる。 In the present specification, “a tobacco raw material whose apparent density is known” refers to a tobacco raw material whose apparent density is measured by a conventional measuring method. The conventional measurement method is to chop the leaf tobacco and harmonize it for 2 days until it becomes balanced in a conditioned room strictly adjusted to 22 ± 2.0 ° C and 60 ± 5.0% RH. In the same room, the apparent density is measured. In order to obtain an accurate measurement value, it is common to repeat measurement at least three times and obtain the average. In addition, about 30 minutes per sample are required for the measurement by the apparent density measuring device. The measurement principle is as follows: 1) First, the pycnometer is fully filled with mercury and the weight (H) is measured. 2) Weigh 1 to 2 g of the measurement sample (W) and put it into an empty pycnometer. 3) Fill the pycnometer filled with the sample to be filled with mercury and measure the weight (Hw). 4) Obtain the apparent density by the following formula.
Apparent density (g / cm 3 ) = W × 13.54 / (H−Hw + W)
The wavelength region of the near-infrared spectrum for creating the calibration curve may be appropriately selected, and is, for example, 800 nm to 2500 nm. However, it is not limited to this wavelength region, and may be a narrower wavelength region. The near-infrared spectrum can be measured by scanning every arbitrary wavelength interval within the above wavelength range, for example, every 0.5 nm.
　次に、検量線の具体的な作成方法について説明する。 Next, a specific method for creating a calibration curve will be described.
　まず、見掛密度が既知であるたばこ原料の試料に対して、分光されて単色光となった近赤外線を、ある波長領域内（例えば、８００ｎｍ～２５００ｎｍ）、一定間隔（例えば、０．５ｎｍ間隔）で照射する。試料において近赤外線の透過吸収および／または拡散反射が起こるため、試料に吸収されなかった単色光強度を検出器によって測定する。事前に測定したレファレンス強度との違いから試料における各波長の吸収強度のスペクトルを表示し、表示したスペクトル情報をデータとして取得する。複数の試料、好ましくは３０サンプル以上について上記の処理を行い、これにより、複数のスペクトル情報のデータを取得する。それぞれのデータについて、透過吸収スペクトルまたは拡散反射スペクトルを測定した後、これらを２次微分スペクトルに変換する。得られた２次微分スペクトルおよび従来の測定法を用いて測定された見掛密度を用いて主成分分析を行い、目的変数（見掛密度）に寄与する主成分（主波長）を選択する。次いで、重回帰分析およびＰＬＳ回帰分析などの多変量解析を行うことによって、検量線を作成する。 First, a near-infrared light that has been spectrally separated into monochromatic light with respect to a sample of a tobacco raw material having a known apparent density is distributed within a certain wavelength region (for example, 800 nm to 2500 nm) at regular intervals (for example, 0.5 nm intervals). ). Since near infrared transmission and / or diffuse reflection occurs in the sample, the intensity of monochromatic light not absorbed by the sample is measured by a detector. The spectrum of the absorption intensity at each wavelength in the sample is displayed from the difference from the reference intensity measured in advance, and the displayed spectrum information is acquired as data. The above-described processing is performed on a plurality of samples, preferably 30 samples or more, thereby acquiring a plurality of pieces of spectral information data. About each data, after measuring a transmission absorption spectrum or a diffuse reflection spectrum, these are converted into a secondary differential spectrum. Principal component analysis is performed using the obtained secondary differential spectrum and the apparent density measured using the conventional measurement method, and the principal component (main wavelength) contributing to the objective variable (apparent density) is selected. Next, a calibration curve is created by performing multivariate analysis such as multiple regression analysis and PLS regression analysis.
　なお検量線が作成されれば、その次の測定からはこの検量線を用いればよく、検量線を作成する工程は不要となる。 If a calibration curve is created, this calibration curve can be used from the next measurement, and the step of creating a calibration curve is not necessary.
　また、黄色種、バーレー種、オリエント種および在来種等、複数種のたばこ原料を用いて透過吸収スペクトルを測定し、それらを利用して一つの検量線を作成した場合には、相違する種類のたばこ原料の試料について、共通の検量線を用いて見掛密度を測定することができる。 In addition, when a transmission absorption spectrum is measured using a plurality of types of tobacco raw materials such as yellow, Burley, Orient, and native species, and a single calibration curve is created using them, different types are used. The apparent density of a sample of tobacco material can be measured using a common calibration curve.
　以上のように、本発明に係る見掛密度の測定方法によれば、従来の測定方法に比べ、処理が煩雑でなく、短時間（約１／２０）で測定を完了することができるとともに、毒物である水銀を使用しなくて済む。また、得られる測定結果は、従来の測定方法により得られる結果と高い相関がある。 As described above, according to the apparent density measuring method according to the present invention, the processing is not complicated compared to the conventional measuring method, and the measurement can be completed in a short time (about 1/20). No need to use mercury, a poisonous substance. Moreover, the measurement result obtained has a high correlation with the result obtained by the conventional measurement method.
　以下に実施例を示し、本発明の実施の形態についてさらに詳しく説明する。もちろん、本発明は以下の実施例に限定されるものではなく、細部については様々な態様が可能であることはいうまでもない。さらに、本発明は上述した実施形態に限定されるものではなく、請求項に示した範囲で種々の変更が可能であり、それぞれ開示された技術的手段を適宜組み合わせて得られる実施形態についても本発明の技術的範囲に含まれる。また、本明細書中に記載された文献の全てが参考として援用される。 Examples will be shown below, and the embodiments of the present invention will be described in more detail. Of course, the present invention is not limited to the following examples, and it goes without saying that various aspects are possible in detail. Further, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope shown in the claims, and the present invention is also applied to the embodiments obtained by appropriately combining the disclosed technical means. It is included in the technical scope of the invention. Moreover, all the literatures described in this specification are used as reference.
　〔実施例１：黄色種の見掛密度測定〕
　（検量線の作成）
　従来の見掛密度測定法を用いて見掛密度を測定した、国内外のたばこ黄色種のたばこ刻を、粉砕機で粉状にした。編み目約１ｍｍの粉砕機のふるいを通過した葉たばこ粉末を、検量線作成試料として用いた。検量線作成試料について、８００～２５００ｎｍの近赤外波長領域に関し、０．５ｎｍ間隔で透過吸収スペクトルを測定した。具体的には、石英製バイアル瓶（２９ｍｍ径）に検量線作成試料を１～２ｇ程度詰め、専用具で鎮圧した後、近赤外線分光測定装置（ＦＯＳＳ　ＮＩＲＳｙｓｔｅｍｓ社製、型式：ＸＭ－１１００）を用いて、バイアル瓶の底面から近赤外線を照射し、波長毎に反射する近赤外線を検出してレファレンス強度との違いから透過吸収スペクトルを測定した。 [Example 1: Apparent density measurement of yellow species]
(Create a calibration curve)
Cigarettes of domestic and foreign cigarettes, whose apparent density was measured using a conventional apparent density measurement method, were pulverized with a pulverizer. The leaf tobacco powder that passed through the screen of a grinder having a stitch of about 1 mm was used as a calibration curve preparation sample. For the calibration curve prepared sample, the transmission absorption spectrum was measured at 0.5 nm intervals in the near infrared wavelength region of 800 to 2500 nm. Specifically, about 1 to 2 g of a calibration curve preparation sample is packed in a quartz vial (29 mm diameter), and after being compressed with a dedicated tool, a near-infrared spectrometer (model: XM-1100, manufactured by FOSS NIRSystems) is used. The near-infrared ray was irradiated from the bottom of the vial, the near-infrared ray reflected for each wavelength was detected, and the transmission absorption spectrum was measured from the difference from the reference intensity.
　検量線作成試料１８７サンプルについて透過吸収スペクトルを測定した後、当該スペクトルと、従来の測定方法により得られていた見掛密度との相関を多変量解析手法を用いて解析して、検量線を作成した。詳細には、上記近赤外線分光測定装置に内蔵された汎用ＶＩＳＩＯＮソフト（ＦＯＳＳ　ＮＩＲＳｙｓｔｅｍｓ社製）を用いて、各透過吸収スペクトルを２次微分法でスペクトル変換し、目的変数を既知見掛密度、主成分を主波長として主成分分析を行った後に、重回帰分析によって検量線を作成した。その結果、以下の推定式（Ａ１）～（Ａ５）を得ることができた。下記推定式によって得られるＹが見掛密度の推定値である。Ｋ（１）～Ｋ（５）は、それぞれ、スペクトル測定後に微分処理された、波長２４２８．５ｎｍ、１４９５．０ｎｍ、１４２０．５ｎｍ、１９６３．５ｎｍ、および１１６０．０ｎｍにおける吸光度を示している。 Calibration curve preparation After measuring the transmission absorption spectrum of the sample 187 sample, the correlation between the spectrum and the apparent density obtained by the conventional measurement method is analyzed using a multivariate analysis method to create a calibration curve. did. Specifically, using the general-purpose VISION software (FOSS, manufactured by NIRSystems) built in the near-infrared spectrometer, each transmission absorption spectrum is spectrum-converted by the second-order differential method, and the objective variable is the known apparent density, the main variable. After performing principal component analysis with the component as the dominant wavelength, a calibration curve was created by multiple regression analysis. As a result, the following estimation formulas (A1) to (A5) could be obtained. Y obtained by the following estimation formula is an estimated value of the apparent density. K (1) to K (5) indicate the absorbances at wavelengths of 2428.5 nm, 1495.0 nm, 1420.5 nm, 1963.5 nm, and 1160.0 nm, which were differentiated after the spectrum measurement, respectively.
　これらの推定式は、決定係数（Ｒ２）が０．６２７４～０．８１６２であり、標準誤差が０．０３１３～０．０４４１であった。 In these estimation formulas, the coefficient of determination (R 2 ) was 0.6274 to 0.8162, and the standard error was 0.0313 to 0.0441.
Figure JPOXMLDOC01-appb-T000001
 　各検量線作成試料について、従来の測定法により得られた見掛密度と、推定式（Ａ５）を用いて近赤外分光法により得られた見掛密度推定値との関係を図１に示す（図１中、「CAL」）。
Figure JPOXMLDOC01-appb-T000001
 FIG. 1 shows the relationship between the apparent density obtained by the conventional measuring method and the apparent density estimated value obtained by the near-infrared spectroscopy using the estimation formula (A5) for each calibration curve preparation sample. ("CAL" in FIG. 1).
　（近赤外分光法による見掛密度の測定）
　見掛密度が未知である黄色種たばこ刻について、近赤外分光法によりスペクトル測定を行い、上記検量線を用いて見掛密度を推定した。まず、検量線作成試料の調製と同様にして、見掛密度が未知である黄色種たばこ刻を粉砕機で粉状にし、ふるいにかけて測定試料とした。透過吸収スペクトルを測定し、スペクトル測定後に微分処理した波長１１６０．０ｎｍ、１４２０．５ｎｍ、１４９５．０ｎｍ、１９６３．５ｎｍ、および２４２８．５ｎｍにおける吸光度および推定式（Ａ５）を用いて、測定試料５９サンプルについて見掛密度推定値を算出した。なお、１サンプルの測定に要する時間は、１分以下である。 (Measurement of apparent density by near infrared spectroscopy)
The spectrum of yellowish tobacco with an unknown apparent density was measured by near infrared spectroscopy, and the apparent density was estimated using the calibration curve. First, in the same manner as the preparation of the calibration curve preparation sample, yellow seed tobacco having an unknown apparent density was powdered with a pulverizer and sieved to obtain a measurement sample. 59 samples of the measurement sample were measured using the absorbance at the wavelength of 1160.0 nm, 1420.5 nm, 1495.0 nm, 1963.5 nm, and 2428.5 nm and the estimated expression (A5) measured after measuring the transmission absorption spectrum The apparent density estimate was calculated for. Note that the time required for measuring one sample is 1 minute or less.
　なお、各測定試料について近赤外分光法により見掛密度を推定した後、従来の測定法により同一試料の見掛密度を測定し、近赤外分光法により得られた見掛密度推定値と、従来の測定法により得られた見掛密度との相関関係を調べた。結果を図１に示す（図１中、「Vali」）。 In addition, after estimating the apparent density of each measurement sample by near infrared spectroscopy, the apparent density of the same sample was measured by a conventional measurement method, and the apparent density estimated value obtained by near infrared spectroscopy was The correlation with the apparent density obtained by the conventional measurement method was examined. The results are shown in FIG. 1 (“Vali” in FIG. 1).
　図１に示すとおり、従来の測定方法により得られた見掛密度と、近赤外分光法により得られた見掛密度の推定値との間には高い相関が見られた。すなわち、近赤外分光法を用いた本発明に係る見掛密度の測定方法により、精度よく、簡便に、たばこ刻の見掛密度を測定することができる。 As shown in FIG. 1, a high correlation was observed between the apparent density obtained by the conventional measuring method and the estimated value of the apparent density obtained by the near infrared spectroscopy. That is, the apparent density of tobacco can be accurately and easily measured by the apparent density measuring method according to the present invention using near infrared spectroscopy.
　〔実施例２：バーレー種の見掛密度測定〕
　（検量線の作成）
　検量線作成試料を、国内外のたばこバーレー種９２サンプルとした以外は、実施例１と同様にして、重回帰分析によって検量線を作成した。その結果、以下の推定式（Ｂ１）～（Ｂ５）を得ることができた。下記推定式によって得られるＹが見掛密度の推定値である。Ｋ（１）～Ｋ（５）は、それぞれ、スペクトル測定後に微分処理された、波長１４５５．０ｎｍ、１２２１．５ｎｍ、２１１８．５ｎｍ、２３１５．０ｎｍ、および１２６６．０ｎｍにおける吸光度を示している。 [Example 2: Measurement of apparent density of Burley species]
(Create a calibration curve)
A calibration curve was created by multiple regression analysis in the same manner as in Example 1 except that the calibration curve creation sample was 92 samples of domestic and foreign tobacco burley species. As a result, the following estimation formulas (B1) to (B5) could be obtained. Y obtained by the following estimation formula is an estimated value of the apparent density. K (1) to K (5) indicate the absorbances at wavelengths of 1455.0 nm, 1221.5 nm, 218.5 nm, 2315.0 nm, and 1266.0 nm, which were differentiated after the spectrum measurement, respectively.
　これらの推定式は、決定係数（Ｒ２）が０．６２１７～０．８５５５であり、標準誤差は０．０２０２～０．０３１９であった。 In these estimation formulas, the coefficient of determination (R 2 ) was 0.6217 to 0.8555, and the standard error was 0.0202 to 0.0319.
Figure JPOXMLDOC01-appb-T000002
 　各検量線作成試料について、従来の測定法により得られた見掛密度と、推定式（Ｂ５）を用いて近赤外分光法により得られた見掛密度推定値との関係を図２に示す（図２中、「CAL」）。
Figure JPOXMLDOC01-appb-T000002
 FIG. 2 shows the relationship between the apparent density obtained by the conventional measuring method and the apparent density estimated value obtained by the near-infrared spectroscopy using the estimation formula (B5) for each calibration curve preparation sample. ("CAL" in FIG. 2).
　（近赤外分光法による見掛密度の測定）
　見掛密度が未知であるバーレー種たばこ刻について、近赤外分光法によりスペクトル測定を行い、上記検量線を用いて見掛密度を推定した。まず、検量線作成試料の調製と同様にして、見掛密度が未知であるバーレー種たばこ刻を粉砕機で粉状にし、ふるいにかけて測定試料とした。透過吸収スペクトルを測定し、スペクトル測定後に微分処理した波長１２２１．５ｎｍ、１２６６．０ｎｍ、１４５５．０ｎｍ、２１１８．５ｎｍ、および２３１５．０ｎｍにおける吸光度および推定式（Ｂ５）を用いて、測定試料２６サンプルについて見掛密度推定値を算出した。 (Measurement of apparent density by near infrared spectroscopy)
For Burley tobacco with an apparent density unknown, the spectrum was measured by near infrared spectroscopy, and the apparent density was estimated using the calibration curve. First, in the same manner as the preparation of the calibration curve preparation sample, Burley seed tobacco having an unknown apparent density was powdered with a pulverizer and sieved to obtain a measurement sample. Using the absorbance at the wavelengths 1221.5 nm, 1266.0 nm, 1455.0 nm, 218.5 nm, and 2315.0 nm and the estimated formula (B5) obtained by measuring the transmission absorption spectrum and performing differential processing after the spectrum measurement, 26 samples for measurement The apparent density estimate was calculated for.
　なお、各測定試料について近赤外分光法により見掛密度を推定した後、従来の測定法により同一試料の見掛密度を測定し、近赤外分光法により得られた見掛密度推定値と、従来の測定法により得られた見掛密度との相関関係を調べた。結果を図２に示す（図２中、「Vali」）。 In addition, after estimating the apparent density of each measurement sample by near infrared spectroscopy, the apparent density of the same sample was measured by a conventional measurement method, and the apparent density estimated value obtained by near infrared spectroscopy was The correlation with the apparent density obtained by the conventional measurement method was examined. The results are shown in FIG. 2 (“Vali” in FIG. 2).
　図２に示すとおり、実施例１とは別のたばこ原料を用いた場合であっても、従来の測定方法により得られた見掛密度と、近赤外分光法により得られた見掛密度の推定値との間には高い相関が見られた。 As shown in FIG. 2, even when a tobacco raw material different from Example 1 is used, the apparent density obtained by the conventional measuring method and the apparent density obtained by the near infrared spectroscopy are A high correlation was found between the estimated values.
　〔実施例３：オリエント種の見掛密度測定〕
　（検量線の作成）
　検量線作成試料を、国内外のたばこオリエント種７１サンプルとした以外は、実施例１と同様にして、重回帰分析によって検量線を作成した。その結果、以下の推定式（Ｃ１）～（Ｃ５）を得ることができた。下記推定式によって得られるＹが見掛密度の推定値である。Ｋ（１）～Ｋ（５）は、それぞれ、スペクトル測定後に微分処理された、波長２０３７．５ｎｍ、１４９２．５ｎｍ、１９５２．５ｎｍ、１７２１．０ｎｍ、および２１５９．０ｎｍにおける吸光度を示している。 [Example 3: Apparent density measurement of Orient species]
(Create a calibration curve)
A calibration curve was prepared by multiple regression analysis in the same manner as in Example 1 except that 71 samples of domestic and foreign tobacco orientation species were used as the calibration curve preparation sample. As a result, the following estimation formulas (C1) to (C5) could be obtained. Y obtained by the following estimation formula is an estimated value of the apparent density. K (1) to K (5) indicate the absorbances at wavelengths of 2037.5 nm, 1492.5 nm, 1952.5 nm, 1721.0 nm, and 2159.0 nm, which were differentiated after the spectrum measurement, respectively.
　これらの推定式は、決定係数（Ｒ２）が０．５７６９～０．６９５６であり、標準誤差が０．０２３６～０．０２７０であった。 In these estimation formulas, the coefficient of determination (R 2 ) was 0.5769 to 0.6956, and the standard error was 0.0236 to 0.0270.
Figure JPOXMLDOC01-appb-T000003
 　各検量線作成試料について、従来の測定法により得られた見掛密度と、推定式（Ｃ５）を用いて近赤外分光法により得られた見掛密度推定値との関係を図３に示す（図３中、「CAL」）。
Figure JPOXMLDOC01-appb-T000003
 FIG. 3 shows the relationship between the apparent density obtained by the conventional measurement method and the apparent density estimated value obtained by the near-infrared spectroscopy using the estimation formula (C5) for each calibration curve preparation sample. ("CAL" in FIG. 3).
　（近赤外分光法による見掛密度の測定）
　見掛密度が未知であるオリエント種たばこ刻について、近赤外分光法によりスペクトル測定を行い、上記検量線を用いて見掛密度を推定した。まず、検量線作成試料の調製と同様にして、見掛密度が未知であるオリエント種たばこ刻を粉砕機で粉状にし、ふるいにかけて測定試料とした。透過吸収スペクトルを測定し、スペクトル測定後に微分処理した波長１４９２．５ｎｍ、１７２１．０ｎｍ、１９５２．５ｎｍ、２０３７．５ｎｍ、および２１５９．０ｎｍにおける吸光度および推定式（Ｃ５）を用いて、測定試料２３サンプルについて見掛密度推定値を算出した。 (Measurement of apparent density by near infrared spectroscopy)
For oriental tobacco with an unknown apparent density, the spectrum was measured by near infrared spectroscopy, and the apparent density was estimated using the calibration curve. First, in the same manner as the preparation of the calibration curve preparation sample, the Orient type tobacco having an unknown apparent density was powdered with a pulverizer and sieved to obtain a measurement sample. 23 samples of measurement sample were measured using the absorbance at the wavelengths 1492.5 nm, 1721.0 nm, 1952.5 nm, 2037.5 nm, and 2159.0 nm and the estimated equation (C5) obtained by measuring the transmission absorption spectrum and performing differential processing after the spectrum measurement. The apparent density estimate was calculated for.
　なお、各測定試料について近赤外分光法により見掛密度を推定した後、従来の測定法により同一試料の見掛密度を測定し、近赤外分光法により得られた見掛密度推定値と、従来の測定法により得られた見掛密度との相関関係を調べた。結果を図３に示す（図３中、「Vali」）。 In addition, after estimating the apparent density of each measurement sample by near infrared spectroscopy, the apparent density of the same sample was measured by a conventional measurement method, and the apparent density estimated value obtained by near infrared spectroscopy was The correlation with the apparent density obtained by the conventional measurement method was examined. The results are shown in FIG. 3 (“Vali” in FIG. 3).
　図３に示すとおり、上述の実施例とは別のたばこ原料を用いた場合であっても、従来の測定方法により得られた見掛密度と、近赤外分光法により得られた見掛密度の推定値との間には高い相関が見られた。 As shown in FIG. 3, the apparent density obtained by the conventional measurement method and the apparent density obtained by the near-infrared spectroscopy even when a tobacco raw material different from the above-described examples is used. There was a high correlation with the estimated value of.
　〔実施例４：黄色種、バーレー種およびオリエント種の見掛密度測定〕
　（検量線の作成）
　検量線作成試料をたばこ黄色種１８７サンプル、バーレー種９２サンプルおよびオリエント種７１サンプルの計３５０サンプルとした以外は、実施例１と同様にして、重回帰分析によって検量線を作成した。その結果、以下の推定式（Ｄ１）～（Ｄ５）を得ることができた。下記推定式によって得られるＹが見掛密度の推定値である。Ｋ（１）～Ｋ（５）は、それぞれ、スペクトル測定後に微分処理された、波長１６５３．５ｎｍ、１７３０．０ｎｍ、１４９８．５ｎｍ、１９１０．０ｎｍ、および２３１９．５ｎｍにおける吸光度を示している。 [Example 4: Apparent density measurement of yellow, Burley and Orient species]
(Create a calibration curve)
A calibration curve was prepared by multiple regression analysis in the same manner as in Example 1 except that the calibration curve preparation sample was 187 samples of tobacco yellow species, 92 samples of Burley species and 71 samples of Orient species, for a total of 350 samples. As a result, the following estimation formulas (D1) to (D5) could be obtained. Y obtained by the following estimation formula is an estimated value of the apparent density. K (1) to K (5) indicate absorbances at wavelengths of 1653.5 nm, 1730.0 nm, 1498.5 nm, 1910.0 nm, and 2319.5 nm, respectively, which were differentiated after the spectrum measurement.
　これらの推定式は、決定係数（Ｒ２）が０．６８６７～０．８１５９であり、標準誤差が０．０３１４～０．０４０７であった。 In these estimation formulas, the coefficient of determination (R 2 ) was 0.6867 to 0.8159, and the standard error was 0.0314 to 0.0407.
Figure JPOXMLDOC01-appb-T000004
 　各検量線作成試料について、従来の測定法により得られた見掛密度と、推定式（Ｄ５）を用いて近赤外分光法により得られた見掛密度推定値との関係を図４に示す（図４中、「CAL」）。
Figure JPOXMLDOC01-appb-T000004
 FIG. 4 shows the relationship between the apparent density obtained by the conventional measuring method and the apparent density estimated value obtained by the near infrared spectroscopy using the estimation formula (D5) for each calibration curve preparation sample. ("CAL" in FIG. 4).
　（近赤外分光法による見掛密度の測定）
　見掛密度が未知である黄色種、バーレー種およびオリエント種それぞれのたばこ刻について、近赤外分光法によりスペクトル測定を行い、上記検量線を用いて見掛密度を推定した。まず、検量線作成試料の調製と同様にして、見掛密度が未知である黄色種、バーレー種またはオリエント種のたばこ刻を粉砕機で粉状にし、ふるいにかけて測定試料とした。透過吸収スペクトルを測定し、スペクトル測定後に微分処理した波長１４９８．５ｎｍ、１６５３．５ｎｍ、１７３０．０ｎｍ、１９１０．０ｎｍ、および２３１９．５ｎｍにおける吸光度および推定式（Ｄ５）を用いて、黄色種５９サンプル、バーレー種２６サンプル、およびオリエント種２３サンプルについて見掛密度推定値を算出した。 (Measurement of apparent density by near infrared spectroscopy)
With respect to each of the yellow, Burley, and Orient cigarettes whose apparent density is unknown, spectrum measurement was performed by near-infrared spectroscopy, and the apparent density was estimated using the calibration curve. First, in the same manner as the preparation of the calibration curve preparation sample, the yellow, Burley or Orient cigarettes whose apparent density was unknown were powdered with a pulverizer and sieved to obtain a measurement sample. The transmission absorption spectrum was measured, and the yellow species 59 samples were measured using the absorbance at the wavelengths 1498.5 nm, 1653.5 nm, 1730.0 nm, 1910.0 nm, and 2319.5 nm and the estimation formula (D5) that were differentiated after the spectrum measurement. Apparent density estimates were calculated for 26 samples of Burley species and 23 samples of Orient species.
　なお、各測定試料について近赤外分光法により見掛密度を推定した後、従来の測定法により同一試料の見掛密度を測定し、近赤外分光法により得られた見掛密度推定値と、従来の測定法により得られた見掛密度との相関関係を調べた。結果を図４に示す（図４中、「Vali」）。 In addition, after estimating the apparent density of each measurement sample by near infrared spectroscopy, the apparent density of the same sample was measured by a conventional measurement method, and the apparent density estimated value obtained by near infrared spectroscopy was The correlation with the apparent density obtained by the conventional measurement method was examined. The results are shown in FIG. 4 (“Vali” in FIG. 4).
　図４に示すとおり、検量線が複数の異なるたばこ原料を用いて作成されてものであっても、従来の測定方法により得られた見掛密度と、近赤外分光法により得られた見掛密度の推定値との間には高い相関が見られた。すなわち、測定試料におけるたばこの原料が相違しても、共通の検量線を用いて、精度よくたばこ刻の見掛密度を測定することができる。 As shown in FIG. 4, even if the calibration curve is prepared using a plurality of different tobacco materials, the apparent density obtained by the conventional measurement method and the apparent density obtained by the near infrared spectroscopy are used. There was a high correlation with the density estimate. That is, even if the tobacco materials in the measurement sample are different, the apparent density of the tobacco can be accurately measured using a common calibration curve.
　〔実施例５：ＰＬＳ回帰分析を利用した、黄色種、バーレー種、オリエント種および在来種の見掛密度測定〕
　（検量線の作成）
　検量線作成試料を、国内外のたばこ黄色種１３８サンプル、バーレー種１２３サンプル、オリエント種３１サンプルおよび在来種１５サンプルの計３０７サンプルとして、それぞれについて、実施例１の同様の手法により透過吸収スペクトルを測定した。測定した透過吸収スペクトルと従来の手法により測定した見掛密度との相関をＰＬＳ回帰分析を用いて解析した。詳細には、上記近赤外線分光測定装置に内蔵された統計処理ソフトウェアを用いて、各透過吸収スペクトルを２次微分法でスペクトル変換し、主成分分析を行った後に、ＰＬＳ回帰分析によって検量線を作成した。その結果、決定係数（Ｒ２）が０．９０５５である実用上十分な相関が認められる検量線が得られた。 [Example 5: Apparent density measurement of yellow, Burley, Orient and native species using PLS regression analysis]
(Create a calibration curve)
The calibration curve preparation samples were 307 samples of domestic and foreign tobacco yellow species 138 samples, Burley species 123 samples, Orient species 31 samples, and 15 native species 15 samples, respectively, and the transmission absorption spectrum was obtained in the same manner as in Example 1. Was measured. The correlation between the measured transmission absorption spectrum and the apparent density measured by the conventional method was analyzed using PLS regression analysis. Specifically, using the statistical processing software built in the near-infrared spectrometer, each transmission absorption spectrum is spectrally converted by the second derivative method, and after performing principal component analysis, a calibration curve is obtained by PLS regression analysis. Created. As a result, a calibration curve having a practically sufficient correlation with a coefficient of determination (R 2 ) of 0.9055 was obtained.
　各検量線作成試料について、従来の測定法により得られた見掛密度と、推定式を用いて近赤外分光法により得られた見掛密度の推定値との関係を図５に示す（図５中、「CAL」）。 FIG. 5 shows the relationship between the apparent density obtained by the conventional measurement method and the estimated value of the apparent density obtained by the near-infrared spectroscopy using the estimation formula for each calibration curve preparation sample (see FIG. 5). 5) "CAL").
　（近赤外分光法による見掛密度の測定）
　見掛密度が未知である黄色種、バーレー種、オリエント種および在来種のたばこ刻について、近赤外分光法によりスペクトル測定を行い、上記検量線を用いて見掛密度を推定した。まず、検量線作成試料の調製と同様にして、見掛密度が未知である黄色種、バーレー種、オリエント種または在来種のたばこ刻を粉砕機で粉状にし、ふるいにかけて測定試料とした。波長８００ｎｍ～２５００ｎｍの領域内で、０．５ｎｍ毎に吸収スペクトルを測定し、上記で得た推定式を用いて、黄色種５０サンプル、バーレー種４４サンプル、オリエント種１１サンプルおよび在来種５サンプルの計１１０サンプルについて見掛密度の推定値を算出した。 (Measurement of apparent density by near infrared spectroscopy)
Spectral measurements of yellow, Burley, Orient and native tobacco with unknown apparent density were measured by near-infrared spectroscopy, and the apparent density was estimated using the calibration curve. First, in the same manner as in the preparation of the calibration curve preparation sample, the yellow, Burley, Orient, or conventional tobacco with unknown apparent density was powdered with a pulverizer and sieved to obtain a measurement sample. Absorption spectrum is measured every 0.5 nm within a wavelength range of 800 nm to 2500 nm, and using the estimation formula obtained above, 50 samples of yellow species, 44 samples of Burley species, 11 samples of Orient species and 5 samples of conventional species The estimated value of the apparent density was calculated for a total of 110 samples.
　なお、各測定試料について近赤外分光法により見掛密度を推定した後、従来の測定法により同一試料の見掛密度を測定し、近赤外分光法により得られた見掛密度の推定値と、従来の測定法により得られた見掛密度との相関関係を調べた。結果を図５に示す（図５中、「Vali」）。 In addition, after estimating the apparent density for each measurement sample by near infrared spectroscopy, the apparent density of the same sample was measured by a conventional measurement method, and the estimated value of the apparent density obtained by near infrared spectroscopy. And the apparent density obtained by the conventional measurement method were examined. The results are shown in FIG. 5 (“Vali” in FIG. 5).
　図５に示すとおり、多変量解析としてＰＬＳ回帰分析を行った場合であっても、従来の測定方法により得られた見掛密度と、近赤外分光法により得られた見掛密度の推定値との間には高い相関が見られた。また、ＰＬＳ回帰分析により検量線を作成した場合であっても、相違する種類のたばこ原料の見掛密度について、共通の検量線を用いて精度よく測定できることが示された。 As shown in FIG. 5, even when PLS regression analysis is performed as multivariate analysis, the apparent density obtained by the conventional measurement method and the estimated value of the apparent density obtained by the near infrared spectroscopy A high correlation was found between Moreover, even when a calibration curve was created by PLS regression analysis, it was shown that the apparent density of different types of tobacco raw materials can be accurately measured using a common calibration curve.
　〔実施例６：ＰＬＳ回帰分析を利用した、黄色種、バーレー種、オリエント種および在来種の刻試料を用いた見掛密度測定〕
（検量線の作成）
　検量線作成試料を、国内外のたばこ黄色種２９０サンプル、バーレー種２２６サンプル、オリエント種６４サンプおよび在来種６４サンプルの計６４４サンプルとして、それぞれについて、実施例１と同様の手法により透過吸収スペクトルを測定した。ただし、測定には、粉状にした試料ではなく、たばこ刻自体を用いた。測定した透過吸収スペクトルと従来の手法により測定した見掛密度との相関を、実施例５と同様の手法によりＰＬＳ回帰分析を用いて解析した。その結果、決定係数（Ｒ２）が０．７５１８である実用上十分な相関が認められる検量線が得られた。 [Example 6: Apparent density measurement using yellow, Burley, Orient, and native seeds using PLS regression analysis]
(Create a calibration curve)
The calibration curve preparation samples were 644 samples of domestic and foreign tobacco yellow species 290 samples, Burley species 226 samples, Orient species 64 sumps and 64 native species 64 samples. Was measured. However, for the measurement, the tobacco itself was used instead of the powdered sample. The correlation between the measured transmission absorption spectrum and the apparent density measured by the conventional method was analyzed by PLS regression analysis using the same method as in Example 5. As a result, a calibration curve having a practically sufficient correlation with a determination coefficient (R 2 ) of 0.7518 was obtained.
　各検量線作成試料について、従来の測定法により得られた見掛密度値と、推定式を用いて近赤外分光法により得られた見掛密度の推定値との関係を図６に示す（図６中、「CAL」）。
（近赤外分光法による見掛密度の測定）
　見掛密度値が未知である黄色種、バーレー種、オリエント種および在来種のたばこ刻について、近赤外分光法によりスペクトル測定を行い、上記検量線を用いて見掛密度を推定した。まず、検量線作成試料の調整と同様にして、見掛密度値が未知である黄色種、バーレー種、オリエント種および在来種のたばこ刻をそのまま測定試料とした。波長８００～２５００ｎｍの領域内で、０．５ｎｍ毎に吸収スペクトルを測定し、上記で得た推定式を用いて、黄色種９５サンプル、バーレー種７４サンプル、オリエント種２１サンプル、および在来種２１サンプルの計２１１サンプルについて見掛密度推定値を算出した。 FIG. 6 shows the relationship between the apparent density value obtained by the conventional measurement method and the estimated value of the apparent density obtained by the near-infrared spectroscopy using the estimation formula for each calibration curve preparation sample ( “CAL” in FIG. 6).
(Measurement of apparent density by near infrared spectroscopy)
For yellow, Burley, Orient, and native tobacco with unknown apparent density values, spectra were measured by near-infrared spectroscopy, and the apparent density was estimated using the calibration curve. First, in the same manner as the adjustment of the calibration curve preparation sample, the tobacco samples of yellow, Burley, Orient, and conventional species whose apparent density values are unknown were used as measurement samples. An absorption spectrum is measured every 0.5 nm within a wavelength range of 800 to 2500 nm, and using the estimation formula obtained above, 95 yellow samples, 74 Burley species, 21 Orient species, and 21 native species are used. Apparent density estimated values were calculated for a total of 211 samples.
　なお、各測定試料について近赤外分光法により見掛密度を推定した後、従来の測定法により同一試料の見掛密度を測定し、近赤外分光法により得られた見掛密度値との相関関係を調べた。結果を図６に示す（図６中、「Vali」）。 In addition, after estimating the apparent density for each measurement sample by near infrared spectroscopy, the apparent density of the same sample is measured by a conventional measurement method, and the apparent density value obtained by near infrared spectroscopy is calculated. The correlation was examined. The results are shown in FIG. 6 (“Vali” in FIG. 6).
　図６に示すとおり、検量線試料が刻形態のものであっても高い決定係数の検量線が得られ、粉状の試料と同様、近赤外分光法により見掛密度を推定できる。また、刻形態の場合であっても、相違する種類のたばこ原料の見掛密度について、共通の検量線を用いて精度よく測定できることが示された。 As shown in FIG. 6, even if the calibration curve sample is in the form of an indentation, a calibration curve with a high coefficient of determination is obtained, and the apparent density can be estimated by near infrared spectroscopy as in the case of the powdery sample. Further, it was shown that even in the case of the engraved form, the apparent density of different types of tobacco raw materials can be accurately measured using a common calibration curve.
　本発明は、紙巻きたばこの設計および製造に利用することができる。 The present invention can be used for the design and manufacture of cigarettes.

Claims (4)

  1. 　たばこ原料の粉末形態または刻形態の試料に近赤外線を照射し、透過吸収スペクトルまたは拡散反射スペクトルを測定する工程と、
    　測定された上記透過吸収スペクトルまたは上記拡散反射スペクトルを用いて、予め作成された検量線から見掛密度推定値を算出する工程とを含むことを特徴とするたばこ原料の見掛密度測定方法。     Irradiating a sample of tobacco raw material in powder form or engraved form with near infrared rays, and measuring a transmission absorption spectrum or diffuse reflection spectrum;
    A method for measuring an apparent density of a tobacco raw material, comprising a step of calculating an apparent density estimated value from a calibration curve prepared in advance using the measured transmission absorption spectrum or diffuse reflection spectrum.
  2. 　上記たばこ原料の上記試料が粉末形態であることを特徴とする請求項１に記載の見掛密度測定方法。 2. The apparent density measuring method according to claim 1, wherein the sample of the tobacco material is in a powder form.
  3. 　見掛密度が既知である複数のたばこ原料の試料の透過吸収スペクトルまたは拡散反射スペクトルを用いて、多変量解析によって上記検量線を作成する工程をさらに含むことを特徴とする請求項１または２に記載の見掛密度測定方法。 3. The method according to claim 1, further comprising the step of creating the calibration curve by multivariate analysis using transmission absorption spectra or diffuse reflection spectra of a plurality of samples of tobacco raw materials whose apparent density is known. The apparent density measurement method described.
  4. 　上記多変量解析は、重回帰分析またはＰＬＳ回帰分析であることを特徴とする請求項３に記載の見掛密度測定方法。 4. The apparent density measuring method according to claim 3, wherein the multivariate analysis is a multiple regression analysis or a PLS regression analysis.
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