Studies on Cigarette Paper during Thermal Decomposition Process

Abstract

In the second paper of this series was reported that the measurement of the pore structure and the surface area of heated papers at different temperatures by “Cigarette Paper Measuring System”.It was suggested there that the changes of the structure of cigarette paper under the thermal decomposition process were caused by deformation of fiber network and the shrinkage of single pulp fiber. And these changes are remarkable at temperature region between 270°C and 350°C where thermal decomposition of cigarette paper proceeds significantly.From above result, it is predictable that the changes of the structure of cigarette paper under the thermal decomposition lead to the shrinkage of cigarette paper, and the investigation of the shrinkage of cigarette paper under thermal decomposition process is important to the development of cigarette paper for commercial products.With these results in mind, this work is intended to investigate the shrinkage of cigarette paper under thermal decomposition process.For this purpose, Thermomechanical analysis (TMA) of cigarette papers were measured and the surface of thermally treated cigarette papers were observed by SEM. Those results were correlated with Thermogravimetry (TG) and Differential thermal analysis (DTA) curves.The results associated with the shrinkage of thermally treated cigarette papers are summarized as follows.The cigarette papers shrunk at temperature region between room temperature and 100t and extended over the temperature region between 200 and 300°C and remarkably shrunk again above 320°CThe starting temperature of shrinkage under the thermal decomposition process of cigarette papers decreased and the TMA curve changed looser with additional quantity of Sodium Citrate. And the cigarette papers shrinkage at temperature of 320t increased with additional quantity of Sodium Citrate region between 0 to 4.2% and decreased with at additional quantity 8.3%.At 320t thermal treated cigarette paper the change of micro-fibril and increase the void volume of fiber to fiber were observed. At 400°C thermal treated cigarette paper the width direction shrinkage of fiber, and remarkably increase of the void volume of fiber to fiber, and the change of micro-fibril and fiber surface were observed.