烟丝结构分布对细支卷烟燃烧锥落头的影响

Effects of cut tobacco structure on burning cone drop of slim cigarettes

为了研究细支卷烟烟丝结构分布与燃烧锥落头之间的相关性,采用包埋固定法对3种不同品牌的细支卷烟烟支及燃烧锥进行原位固定,获得烟支及燃烧锥的切片,并利用光学显微镜对其进行结构分析。结果表明:(1)细支卷烟烟支轴向烟丝密度分布极不均匀,据此将细支卷烟划分为4部分,即a段(距离点燃端0～6 mm)、b段(6～20 mm)、c段(20～50 mm)和d段(50～65 mm)。且烟支b段密度高点与c段密度低点之间的差值△ρ值越大,燃烧锥落头率越高;(2)烟丝配方中中短丝比例越高,细支卷烟的燃烧锥越短,其内部结构越均匀;(3)将标准平准盘更换为U型平准盘,品牌B细支卷烟的燃烧锥落头率从58%降低至28%;(4)烟丝配方中中短丝比例从10%增加至35%,品牌B细支卷烟的燃烧锥落头率从42%降低至20%。

In order to investigate the relationship between cut tobacco structure and the burning cone drop of slim cigarette,the samples of three slim cigarette brands were tested,the burning cigarette was in-situ fixed with embedding method to obtain the slices of the tobacco rod and its burning cone. The cut filler in the slices was analyzed through optical microscopy. The results showed that：1） The axial distribution of cut tobacco density varied widely,therefore the tobacco rod was divided into four sections：section a（0-6 mm from the lit end of cigarette）,section b（6-20 mm from the lit end）,section c（20-50 mm from the lit end）and section d （50-65 mm from the lit end）. The rate of burning cone drop increased with the rise of △ ρ,the difference between the maximum density in section b and the minimum density in section c. 2）The higher the proportion of medium and short shreds in cut filler was,the shorter the burning cone would be,and the higher of the structure evenness in the burning cone would be. 3）The drop rate of the burning cone of brand B decreased from 58% to 28% when the flat ecreteur disc was replaced by a U-shaped ecreteur disc. 4）When the proportion of medium and short shreds in cut filler increased from 10% to 35%,the drop rate of the burning cone of brand B reduced from 42% to 20%.