Research on Measurement Methods of the Orderliness Rate of Tobacco Cut in Conventional Cigarettes Based on High-Resolution CT

The arrangement of filaments in cigarettes has an important impact on the combustion performance of cigarettes. In order to quantitatively characterize the spatial orientation of filaments, it is necessary to establish a measure of the main direction of filament arrangement, and then analyze the differences in the arrangement of different types of cigarettes. Due to the lack of non-destructive means of observing the morphology of the filaments inside the cigarette and the difficulty of analyzing the morphology due to the intertwining of the filaments, the industry currently lacks an effective means of measuring and analyzing the ordering rate of the filaments. In order to address this problem, the study uses high-resolution micro-CT scanning imaging technology to scan the cigarettes, three-dimensional reconstruction of two-dimensional cigarettes tomographic images obtained from scanning based on the filtered inverse projection method, and proposes a method for detecting the ordering rate of the tobacco filaments in the cigarettes based on the average normal vector of the point cloud. After the optimization of scanning resolution and sample penetration, the radial measurement accuracy of the investigated CT scanning imaging method is better than 0.06 mm with relative standard deviation RSD <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$&lt;1 \%$</tex>, and the axial measurement accuracy is better than 0.24 mm with RSD <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$&lt;1 \%$</tex>. Exploring the ordered rate of cigarette filaments of several specifications, it was found that the angle between the total filling direction of fine cigarette filaments and the axial line of the cigarette was about 43.9°, with an average ordered rate of 51.22 %, the angle between the total filling direction of medium cigarette filaments and the axial line of the cigarette was about 33.18°, with an average ordered rate of 63.14 %, and the angle between the total filling direction of regular cigarette filaments and the axial line of the cigarette was about 31.27°, with an average The ordering rate is 65.09 %, showing the distribution of high in the middle and low in the front and back, and the ordering rate of conventional cigarette is higher than that of medium cigarette, and the ordering rate of medium cigarette is higher than that of fine cigarette. This method provides a new means to analyze the physical distribution of tobacco inside the cigarette and to improve the filling process.