Research On Application Of Near-infrared Spectroscopy Technology For Quality Stability Of Cut Tobacco Blending During The Production Process Of Cigarette

Blending uniformity of cut tobacco is very important for quality control during the process of cigarette production,a fast,real-time monitoring technology tool was lacking over the years.The structure determination of current cigarette cut tobacco(YC/T289-2009)was detected according to the size,which can distinguish between stem and cut tobacco,but it is difficult to distinguish between various cut tobacco,and the mentioned method was very time consuming.The near infrared spectroscopy has the advantage of simple and rapid analysis.The application of near infrared spectroscopy technology in blending uniformity of cut tobacco is rarely reported.The cut tobacco production of Yinghuang cigarette was selected as the research object in this study,and blending uniformity of cut tobacco was studied using near infrared spectroscopy combined with chemometrics methods during the cigarette production process,to provide technical support for the evaluation of the quality stability of Yinghuang cigarette.The main conclusions are as follows:(1)4 sampling points with sampling safety and representative production process were selected,namely A sampling point,on the conveyor belt after the blending cabinet,B sampling point,on the conveyor belt after outlet of perfuming machine,C sampling point,on the conveyor belt after outlet of the blending cabinet;D sampling point,on the feeding wheel of feeding machine.The sample spectra was preprocessed using multiple scattering correction,first derivative and S-G smoothing method.The quality change of cut tobacco from the same batch during the process of cigarette production was studied using principal component Mahalanobis distance analysis.The scores of Principal component analysis showed the discrete degree of samples at A sampling point,and principal component of samples spectra gradually gathered in a certain range with the increase of the processing procedure,the samples spectra at C,D sampling points gradually gathered.The variation coefficients of samples at the A,B,C and D sampling points were 33.6%,32.3%,30.1% and 27.2%,respectively,which indicated the discrete degree of samples decreased gradually with the production process.The variation coefficient of samples at the D sampling point was minimum,which showed the blending uniformity of cut tobacco at the D sampling point was best.(2)The quality stability of cut tobacco at D sampling point from three batches was studied using the principal component analysis,the scores showed the cut tobacco at D sampling point and finished cigarette were in the same principal component space,and the position was overlap.The prediction models of chlorine,potassium,nicotine,reducing sugar,total nitrogen and total sugar of tobacco were established by using partial least squares method,and the correlation coefficients of prediction models were 0.9549,0.9575,0.9308,0.9607,0.9020 and 0.9521,respectively.The average relative errors of the predicted values of prediction model and the reference values were 4.31%,3.92%,2.39%,2.85%,2.89% and 2.17%,respectively.The levels of 6 main chemical components in samples at D sampling point from three batches were predicted by using tobacco prediction models,the results indicated that the average content and standard deviation of 6 main chemical components are relatively close,which indicated near infrared spectroscopy can be used to monitor the quality stability of cigarette product from different batches.