抄録
Conventionally the cigarette paper evaluation is conducted based on the cigarette paper properties at room temperature. However, for practical purpose, the change of cigarette paper properties under thermal decomposition process is important associated with the evaluation of burning cigarette characteristic.
With this situation in mind, this series of work is intended to investigate the change of cigarette paper properties under thermal decomposition process. For this purpose, “Cigarette Paper Measuring System” was constructed by the author. This system consists of three parts : (1) determining the thermal treatment temperature of samples, and (2) thermally treating the cigarette paper strip by new apparatus, and (3) investigating the physical properties and pore structure of thermally treated cigarette papers. The treatment temperature was determined by the temperature distribution of static burning cigarette and the result of cigarette paper thermal analysis. The temperature distribution of static burning cigarette and the thermal analysis show that the cigarette paper pyrolysis and oxidation progressed with burning at the back (beside) of charline. The charline temperature ranged from 350 to 450°C and this temperature region is consistent with the temperatures that provide drastic changes in the Thermo-Gravimetry (TG) curves and also with the Differential Scanning Calorimeter (DSC) peak temperature.
From the above result, the treatment temperature was set as : 150, 200, 250, 270, 300, 320, 350, and 400°C.
The physical properties of thermally treated cigarette papers are summarized as follows. The relationship between the thermal treatment temperature and the weight loss or the dimension changes (i.e., shrinkage, thickness, density) have a similar tendency to TG curves. These properties showed remarkable change at DSC peaks. The optical properties including chromaticness index and the permeability change appeared at temperature lower than the characteristic temperature of TG curves. The change in permeability characteristics (i.e., “n” value) depends upon the beating degree of pulp. It was also shown that dynamic Young's modulus of heated paper slightly increased at temperature region between 150 and 250°C and decreased remarkably over 300°C.
