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基于近红外光谱法的卷烟包装材料色差分析
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摘要
为分析卷烟包装材料的色差,采集不同颜色油墨涂布白卡纸样品的近红外光谱,对光谱进行二阶微分、Karl Norris导数平滑及多元散射校正(MSC)预处理后,结合Gram-Schmidt正交化方法,建立包装材料色差分析模型。使用模型对待测样品进行相似度计算,并将样品的近红外法相似度计算结果与色差仪分析结果和视觉判别结果进行对比。结果表明:①当样品颜色浓度差低于5%或高于20%时,三者判断结果一致;②当样品颜色浓度差在5%~20%之间时,采用近红外法比色差仪法所得结果准确性更高;③采用近红外法对28个不同生产批次包装材料的色差情况进行判别,并通过主成分分析(PCA)和统计量Hotelling T~2判别进行验证,验证结果表明采用近红外法对不同生产批次包装材料进行色差分析是可行的。
In order to analyze the color difference of cigarette packaging material,the near-infrared spectrums of samples of white paperboard coated with inks of different colors were collected and pre-processed via second differential,Karl Norris derivative smoothing and multiplicative signal correction,then a color difference analysis model was established by incorporating Gram-Schmidt orthogonalization.The values of similarity between standard samples and tested samples were calculated by the model,and the calculated values were compared with the results distinguished by colorimeter and visual judgment.The results showed that:1) When the color density of sample was lower than 5%or higher than 20%,the three methods gave identical results.2)When the color density ranged from 5%to 20%,the results obtained by NIR were more accurate than those by colorimeter.3) The color differences of samples from 28 batches were distinguished by NIR,then verified via principal component analysis and Hotelling T~2 test,the results indicated that it was feasible to analyze the color difference of cigarette packaging material from different batches with NIR spectroscopy.
引文
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