CORESTA Congress, Online, 2022, Smoke Science/Product Technology Groups, ST 77

Effect of filter ventilation hole characteristic on cigarette ventilation rate

DENG Nan(1,2); ZHANG Qi(2); YANG Zhongpan(3); LI Xiqiang(4); WANG Le(2)*; LI Hui(2); WU Lianlian(3); WANG Xiaofeng(5); WANG Bing(2); Li Bin(2)
(1) Instrumental Analysis Center, Xi'an Jiaotong University, Xi’an, Shaanxi, China; (2) Zhengzhou Tobacco Research Institute of CNTC, Zhengzhou, Henan, China; (3) China Tobacco Gansu Industrial Co., Ltd, Lanzhou, Gansu, China; (4) Hongta Liaoning Tobacco Co., Ltd., Shenyang, Liaoning China; (5) China Tobacco Anhui Industrial Co., Ltd, Hefei, Anhui, China

Laser perforation is an important method for online perforation of cigarette filters. The quality of the laser perforation is a key factor to ensure the stability of cigarette quality. Nowadays, the hole quality with different laser perforation parameters is evaluated using only high magnification microscopes to observe the circumference of the holes, without further research on the shape, size and depth of the hole. Therefore, to investigate the effect of laser perforation stability on filter ventilation, this study characterises the shape, size and depth of filter ventilation holes under different pulse durations (15 µs ~ 120 μs) by using a 3D focus variation optical microscope, measuring the filter ventilation of the cigarette samples and determining the relationship between them. The results show that the laser pulse duration has a strong effect on the hole characteristics: 1) With the increase of pulse duration, the diameter of the ventilation holes increases linearly, R2 = 0.986, and the variation coefficient was within 7 %. 2) Similarly, the filter ventilation increases, and the correlation between filter ventilation and pulse duration was in line with the logistic curve, R2 = 0.997. And the relative deviation between the simulated value and the test value was within 6 %. 3) The relationship between hole diameter and filter ventilation was also in line with the logistic curve, R2 = 0.998. 4) The reasons for the above two observations are that when the pulse duration is shorter, the depth of the ventilation holes is small, and there were ventilation holes that did not penetrate the paper. When the pulse duration is longer, the ovality of the holes gradually decreases, and the equivalent area of the elliptical holes is smaller than the area of the circular holes under the same laser perforation conditions.