| In the recent four decades,the application of powder technology has greatly promote the development of the industry,the progress of industrials and improve the people’s living standard.But in the tobacco industry,study of the physical and chemical characteristics of tobacco superfine powder has not been reported in the paper.Therefore,this thesis makes a preliminary study on the tobacco powder particle granularity,moisture holding capacity and chemical composition.1.600 mesh,800 mesh and 1000 mesh of tobacco stem and leaf ultrafine powder were prepared by the air slide disintegrating mill.The particle granularity distribution characteristics of tobacco stem and leaf ultrafine powder was analyzed.The results showed that,the smaller the particle granularity of each sample,the better the dispersion and uniformity,besides,the dispersion and uniformity of cut-stem tobacco ultrafine powder is better than leaf ultrafine powder.The relationship between the granularity of powder and particle granularity distribution of characteristic parameters of D10,D50,D90 were analyzed by principal component regression,the regression equation is:Y=800.00-163.56X1-170.34X2168.60X3,R2 is 0.933;the results of correlation analysis between the granularity and the main characteristics of grain granularity distribution parameters D10,D50,D90 showed that,the granularity and D10,D50,D90 were positively correlated,the smaller the value of D50,D10,and D90,the smaller the granularity.2.The effect of granularity on moisture holding capacity of ultra-fine powder was studied,the results showed that,1)the moisture absorption rate was the greatest if glycerol was added into the ultra-fine powder of the same granularity.24 hours later the increment of moisture absorption rate was at its maximum.The slightly smaller increment of moisture absorption rate was confirmed in the sample which was added with propylene glycol humectant.Tobacco stem ultra-fine powder with smaller granularity has the higher moisture absorption rate and moisture soakage.The moisture loss rate of the same granularity of the tobacco stem ultrafine powder added glycerol is the slowest,the moisture loss rate of the blank sample is the fastest.Tobacco stem ultrafine powder with smaller granularity has the lower moisture volatilization.2)The controller has the greatest moisture absorption rate with the same granularity.24 hours later the increment of moisture absorption rate was at its maximum.Moisture absorption rate and moisture soakage was suffocated after the humectant was added.Tobacco stem ultra-fine powder with smaller granularity has the higher moisture absorption rate,it leaded to higher increment of moisture absorption rate finally.The moisture loss rate was not appeared to be much different between different granular tobaccos.The effect of granularity on moisture loss situation was inconspicuous.The moisture holding capacity of tobacco stem ultra-fine powder is superior to the tobacco leaf ultra-fine powder with the same granularity.3.The complex permittivity of the tobacco stem ultra-fine powder and tobacco leaf ultra-fine powder was detected,and how the granularity impacted on permittivity and dielectric loss of the ultra-fine powder was analyzed properly.The results showed that the smaller the granularity,the smaller the dielectric constant.Permittivity and dielectric loss of the tobacco stem ultra-fine powder were higher than the same granular powder of tobacco leaf.4.The six conventional chemical components of ultra-fine powder of tobacco stem and tobacco leaf was detected by near infrared scanner,the results show that the potassium and chlorine content of tobacco stem ultra-fine powder was significantly higher than tobacco leaf ultra-fine powder.Yet,total sugar,reducing sugar,nicotine content was lower than tobacco leaf ultra-fine powder.The content of total nitrogen was not appeared to be much different between them.The general chemical component content would be reduced with the decrease of the granularity. |
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