聚乳酸膜材料在加热卷烟中的应用研究

  目的  研究聚乳酸（PLA）膜材料和聚乳酸膜纸复合材料在加热卷烟中的应用特性。  方法  利用自制温度数据采集系统、扫描电镜(SEM)、静态顶空-气相色谱质谱仪(SHS-GC/MS)和热重分析仪(TGA)对加热卷烟中2种PLA膜材料和1种PLA膜纸复合材料的物理性状、挥发性成分进行对比分析，研究这几种降温材料的降温效果及对加热卷烟烟雾量的影响。  结果  ① 当热重温度从50℃升到110℃，膜纸复合材料的失重率高于膜材料的失重率；②随着顶空处理温度的升高，PLA膜材料和PLA膜纸复合材料的释放物种类和释放量均显著增加；③对比110℃时每克材料中释放物的峰面积，PLA膜纸复合材料中的丙二醇和三醋酸甘油酯的释放量均高于PLA膜材料，L-丙交酯释放量仅为PLA膜材料的1/10；④降温材料类型及成棒工艺对烟支烟雾量有较大影响；⑤在高温烟气作用下，PLA膜材料发生了大面积的熔融粘连，孔道大量消失；PLA膜纸复合材料只是局部发生了熔融粘连，并且由于纸的骨架支撑作用保留了大量的孔道，有利于烟气流动。  结论  PLA膜材料和PLA膜纸复合材料的物理形态、成棒工艺对加热卷烟有显著影响。 

Study on application of polylactic acid membrane materials in heated cigarette

  Objective  This paper aims to study the application characteristics of polylactic acid (PLA) membrane material and PLA membrane paper composite material in heated cigarette.  Methods  The physical properties and volatile components of two PLA membrane materials and one PLA membrane paper composite material were analyzed by using self-made temperature data acquisition system, scanning electron microscopy (SEM), static headspace gas chromatography-mass spectrometer (SHS-GC/MS) and thermogravimetric analyzer (TGA). The cooling effect of these cooling materials as well as their effect on smoke quantities of heated cigarette were studied.  Results  Test dates showed that: (1)From 50℃ to 110℃, the weight loss ratio of PLA membrane paper composites was higher than that of PLA membrane materials. (2) With the increase of headspace treatment temperature, the species and quantities of volatile constituents released from PLA membrane materials and PLA membrane paper composite materials were increased significantly. (3) Through comparing the peak area of the volatile constituents per gram of these materials at 110℃, the release amounts of propylene glycol and glyceryl triacetate from PLA membrane paper composites were higher than those from PLA membrane materials, and the release amounts of L-lactide from PLA membrane paper composites were only 1/10 of those from PLA membrane paper composites. (4) The type of cooling material and rod forming process had great influence on smoke quantities of heated cigarette. (5) Under the high temperature smoke, a large area of fused adhesion of polylactic acid (PLA) membranes occurred, and a large number of pores disappeared. The PLA membrane paper composites were fused locally and a large number of pores were retained due to the skeleton support of paper, which were conducive to flue gas flow.  Conclusion  The physical morphology and rod forming process of PLA membrane materials and PLA membrane paper composite materials had a significant influence on heated cigarette.