HXD在线膨胀工艺参数和膨胀率与卷烟质量的关系

Relationship between Technological Parameters of HXD, Expansion Rate of Cut Lamina and Cigarette Quality

为进一步提高叶丝的在线膨胀效果,对不同等级的烤烟型卷烟叶丝在HXD上的膨胀效果进行了试验。结果表明:①提高HXD进料含水率和工艺气流的干燥温度,可提高叶丝的膨胀率;②当叶丝的进料含水率为22%时,经HXD膨胀后叶丝的膨胀率以及卷烟的物理指标、烟气指标等与滚筒式烘丝机处理后的结果基本一致;③在试验范围内,提高喷射蒸气的流量,可提高叶丝的膨胀率;④提高进料含水率和工艺气流的热风温度,可使卷烟在吸阻和硬度不变的情况下降低单支重量;⑤随着进料含水率和工艺气流干燥温度的提高,卷烟烟气焦油呈下降趋势,而烟碱和CO下降趋势不明显;⑥高档卷烟配方不宜采用HXD进行膨胀干燥;采用HXD进行膨胀干燥时,中档卷烟和低档卷烟的进料含水率宜分别控制在24%和28%左右。

To further improve the expansion rate, cut rags of several brands of Virginia-type cigarettes were processed with HXD under different conditions. The results showed that: 1) the expansion rate of cut rag increased with the increase of input moisture content and air temperature; 2) when the input moisture content was 22%, the expansion rate of cut rag, the physical index and smoke index of cigarette were comparable with those dried by a cylinder dryer; 3) the expansion rate of cut rag was raised by increasing steam flow within the tested range; 4) the cigarette weight and tar delivery decreased with the increase of input moisture content of cut rag and air temperature, however, nicotine and carbon monoxide deliveries of the cigarette basically unchanged; 5) the input moisture content of cut rag suitable to medium and low price cigarettes was 24% and 28%, respectively. However, the cut rag for premium cigarettes was unfavorable to be dried with HXD.