Study on vaporisation temperature of electronic cigarette
The vaporisation temperature of electronic cigarettes (e-cigarettes) affects the release and migration of harmful components in e-cigarettes greatly. Therefore a method for measuring the vaporisation temperature was established based on a thermocouple to investigate the influencing factors of the vaporisation temperature and their influence rules. The results showed that the vaporisation temperature of e-cigarettes was in the range of 160 °C - 250 °C, which correlated to the type, heating power, puff number and puff duration of e-cigarettes and the solvent composition of the electronic liquid (e-liquid) for e-cigarettes. During a single puff, the variation of vaporisation temperature could be divided into two stages, rapid rise stage and slow rise stage. In the whole smoking process of an e-cigarette, the vaporisation temperature of a disposable e-cigarette rose, while that of a refillable e-cigarette did not vary with the proceeding of smoking; which was probably due to the difference of e-liquid suction means between the two types of e-cigarettes. The higher ratio of glycerol/propylene glycol in e-liquid resulted in higher vaporisation temperature of e-cigarettes. Moreover, the vaporisation temperature rose with the increase of heating power of e-cigarette atomisers and the prolongation of puff duration. The results of this work provide a reference for the researches on pyrolytic harmful components in aerosol of e-cigarette and the migration of harmful ingredients in the material of the e-cigarette set.