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A method for measuring the moisture content of tobacco and its tobacco products

A technology for tobacco products and determination methods, applied in the direction of weighing by removing certain components, to achieve the effects of ensuring accuracy, good repeatability, and shortening detection time

Active Publication Date: 2016-08-17
CHINA TOBACCO GUANGDONG IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved in the present invention is to overcome the technical deficiencies of the existing oven method for measuring the moisture content of tobacco and its tobacco products, and provide a method for measuring the moisture content of tobacco and its tobacco products

Method used

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  • A method for measuring the moisture content of tobacco and its tobacco products
  • A method for measuring the moisture content of tobacco and its tobacco products
  • A method for measuring the moisture content of tobacco and its tobacco products

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The thermogravimetric analyzer adopted in this embodiment is the Q500 thermogravimetric analyzer of American TA company (but not therefore

[0030] The model of the thermogravimetric analyzer is limited, and those skilled in the art can use other types of thermogravimetric analyzers (other types of thermogravimetric analyzers commonly used in this field can be used), and the total flow rate of high-purity nitrogen (99.99%) is 100mL / min.

[0031] Tobacco sample A18 is placed in the thermogravimetric analyzer for temperature programming, when the tested tobacco sample is heated

[0032] When losing moisture during the process, record the thermogravimetric curve, and calculate the moisture content in the tested tobacco sample according to the weight loss; The sample size was 16.1110 mg. The test results are attached figure 1 As shown, curve 1 is the weight loss curve, curve 2 is the temperature-time relationship curve, and curve 3 is obtained by deriving the percentage o...

Embodiment 2

[0034] Analytical instrument is with embodiment 1. The total flow of high-purity nitrogen (99.99%) is 100mL / min, the flow of divided samples is 90mL / min, and the balance is 10mL / min.

[0035] The present invention conducts continuous experiments on the same tobacco sample and a large number of different tobacco samples at different heating rates, and concludes that moisture detection of tobacco and its products can be established at a heating rate of 50°C / min to obtain more accurate results. And further increase the temperature from room temperature (25°C) to different temperatures at a heating rate of 50°C / min, set the temperature for 8 minutes, count, compare and analyze the experimental results, and confirm that the temperature can be increased to 110°C to obtain accurate detection results. The experimental process and results can not be repeated here one by one, the present embodiment is attached figure 2 The thermogravimetric curves of heating from room temperature (25°...

Embodiment 3

[0038]Analytical instrument is with embodiment 1. The total flow of high-purity nitrogen (99.99%) is 100mL / min, the flow of divided samples is 90mL / min, and the balance is 10mL / min.

[0039] For sample A18, the sample volume for each analysis is 20.6180mg; the temperature is raised from room temperature (25°C) to 110°C at 50°C / min; the constant temperature is 8min, and the running time is 9.8min. The results of the analysis are attached image 3 shown. attached by image 3 It can be seen that the moisture content of the A18 sample is 4.70%; the moisture content of the same batch of samples A18 tested by the oven method (YC / T 31-1996) is 4.74%, and the results are very close. However, the sample used for the oven method is 2-3g, which takes about 4 hours (it takes about 2 hours to bake the weighing dish).

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Abstract

The invention relates to the technical field of tobaccos, and discloses a measurement method for the content of moisture in a tobacco and a tobacco product. The measurement method comprises the following steps: performing programmed temperature rising by placing a tobacco sample in a thermogravimetric analyzer, recording a thermogravimetric curve when the measured tobacco sample loses the moisture in the scientifically designed heating process, and calculating the content of the moisture of the tobacco product according to weight loss, wherein the programmed temperature rising is carried out from room temperature to 110 DEG C at the speed of 50 DEG C / min, the constant temperature is kept for 8 minutes, the operating time lasts about 9.8 minutes, and moisture content results of the tobacco and the tobacco product can be acquired accurately. The moisture content detected by adopting the method disclosed by the invention is basically consistent with a result obtained by adopting a drying oven method stipulated by the conventional detection standard in the field. Compared with the drying oven method, for the measurement method disclosed by the invention, the sample amount of the method disclosed by the invention is small, the time consumption is low, and any pre-treatment is not required to be performed on the sample. The measurement method has the high repeatability and an important actual application popularization value.

Description

technical field [0001] The invention relates to the technical field of tobacco detection, in particular to a method for measuring the moisture content of tobacco and tobacco products. Background technique [0002] Moisture is an important factor affecting the quality of tobacco and tobacco products. In the processes of threshing and redrying, aging, silk making, wrapping, etc., moisture directly affects the processing consumption, physical properties and intrinsic sensory quality of tobacco and tobacco products. [0003] Existing moisture determination methods for tobacco and tobacco products include oven method (YC / T 31-1996), Karl Fischer method (GB / T23357-2009), gas chromatography (YC / T 345-2010), etc. The principle of the oven method to detect the moisture of tobacco and its products is to dry the tobacco or tobacco products at low temperature, grind them into a certain particle size of tobacco powder, dry the samples under certain conditions, and calculate the moisture...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N5/04
Inventor 王华李峰林云
Owner CHINA TOBACCO GUANGDONG IND
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