不同工艺聚乳酸膜用于加热卷烟的降温性能研究

为探究不同工艺对聚乳酸膜(PLA)作为加热卷烟降温段材料的降温性能影响，采用吹塑、拉伸与流延等成型工艺制备了3种PLA膜并加工成相应的基棒，并考察了3种膜的热物性参数（热扩散系数与导热系数等）及降温段基棒对模拟热气流的降温效果。结果表明，拉伸膜在3种PLA基棒中的降温效果最优，3种基棒降温性能的优劣主要与其在成型过程中的热历史与受力史导致的分子链取向与结晶度差异有关。因此，通过调整PLA膜成型工艺可以调控其降温性能，能够为加热卷烟降温材料的设计与加工提供有益指导。

Cooling performance of polylactic acid films for heating cigarettes with different processing technologies

In order to explore the influence of different processes in the polylactic acid (PLA) film formation on the smoke cooling performance, three kinds of PLA films were prepared by blow molding, stretching and casting processes and further processed into corresponding filter rods. The heat transfer characteristics of the three PLA films were tested, including heat transfer coefficient, thermal conductivity, etc.. The cooling ability of the three PLA filter rods on the hot air flow was also investigated. The results showed that the PLA stretch film was in the best cooling effect. It could be concluded that the difference in molecular chain orientation and crystallization caused by the difference in thermal history and force history among three film forming processes was the main reason that affected the heat transfer efficiency of the three filter rods. Therefore, the cooling performance of the PLA film as a filter rod material can be controlled by adjusting the molding process of the PLA film, which will provide useful guidance for the design and processing of the heating cigarette cooling filter rod.