【摘要】 为准确评价配方烟丝在掺配过程中的均匀性,采用热重分析法测算不同时间点所取配方烟丝的热失重反应转化率曲线的相似度,根据相似度间的变异系数建立了计算烟丝掺配均匀度的方法,并将该方法的测试结果与行业标准方法进行对比。结果表明:①热分析测试的优化条件为烟末过40目(粒径:380μm)筛,用量10 mg左右,热分析环境气体流速50 mL/min,升温速率30℃/min;②精密度测试的CV为0.68%～1.29%,重复性测试的CV为0.25%,符合定量分析要求;③该方法与行业标准方法相比,烟丝掺配均匀度的测定结果二者无显著差异,且测试结果的变异系数更小。该方法操作简单、无化学添加、精密度高、重复性较好,适用于烟丝掺配均匀度的准确测定。更多还原

【Abstract】 In order to accurately evaluate the uniformity of cut tobacco blending, the similarity of thermogravimetric reaction conversion rate curves of the blended cut tobacco sampled at different time points was calculated, and the blending uniformity of tobacco was calculated on the basis of the coefficient of variation(CV) of the calculated similarities. The proposed method was compared with the industrial standard method. The results showed that: 1) The optimized conditions of thermal analysis were: tobacco particle size380 μ m, sample volume about 10 mg, the flow rate of environmental gas 50 mL/min, and heating rate 30 ℃/min. 2) The CV of precision test was 0.68%-1.29% and the CV of reproducibility test was 0.25%, which met the requirements of quantitative analysis. 3) There was no significant difference between the results determined by the proposed method and the industrial standard method; moreover, the test results of the proposed method had smaller CV. This method features simple operation, no chemical reagents, high precision and good reproducibility, and is suitable for the accurate determination of cut tobacco blending uniformity.更多还原