ISO 12863卷烟引燃倾向标准评价方法的改进

Improvement on ISO 12863 cigarette ignition propensity assessment method

为解决ISO 12863标准方法测试成本高、测试效率低的问题,结合样品抽样方案设计和统计学算法建立了一种测试支数动态调节的卷烟引燃倾向评价方法,并通过全长燃烧百分比(P-FLB)的二项分布计算分析了该指标偏差较大的原因。结果表明:(1)本文方法与ISO标准方法的准确性和重复性基本一致。(2)P-FLB仅是测定结果置信区间中置信度最高的一点,但其置信度仍然较低,导致理论上可产生10%~20%的最大偏差。(3)当全燃支数较少时(0~4支),ISO方法更稳定,当全燃支数较多时(5~10支),本文方法更稳定,当全燃支数超过6支时,卷烟产品的防火安全性能存在潜在风险。(4)80个LIP样品测试结果显示,与ISO方法相比,本文方法的平均检测时间和专用滤纸使用量均下降了59.65%,取得了较好的节支效果,提高了检测效率。

In order to decrease test cost and increase test efficiency based on ISO 12863 standard method,a sample number-adjustable assessment method for ignition propensity evaluation was developed by combining a sampling scheme and a statistics algorithm.In addition,theoretical reasons for large deviations of the test result index were analyzed via binomial distribution analysis on the full-length burn percentage(P-FLB).The results showed that:1)The accuracy and repeatability of the improved method were consistent with the ISO standard method.2)P-FLB was the highest point in the confidence interval of the test results,however,its confidence was still low,thereby leading to a theoretical maximum deviation of around 10%-20%.3)When the number of full-length burn cigarettes was lower(between 0-4 cigarettes),the ISO method was more stable;when the number was higher(between 5-10 cigarettes),this new method was more stable.When the number was more than 6,there were theoretically potential risks in fire safety performance of the cigarettes based on this test principle.4)The test results of 80 cigarette samples with lower ignition propensity indicated that both the average test time and the Whatman filter paper consumption of this method were reduced by 59.65%comparing with the original ISO method.