摘要: Cigarette paper plays a critical role in carbon monoxide (CO) diffusion during smoking process. Introducing bands with low air diffusion to comply with LIP (low ignition propensity) regulations reduces CO diffusion through these bands. However, there are no tests that measure CO diffusion through the bands and paper during the smoking process. SWM asked Arista Laboratories if a method can be developed using an on-line CO analyzer to measure CO diffusion through cigarette paper along the tobacco column during cigarette puffing and smoldering. An in situ technique was successfully developed that measures CO diffusion through the band and base paper as a test cigarette is smoked. In this study, nitrogen oxide during the smoking process was also measured using an existing Arista Laboratories method. Cigarettes from six brands were selected for the experiments. Band and base paper diffusivities were measured. Band paper diffusivity ranged from 0.034 to 0.100 cm/s and base paper diffusivity from 1.05 to 1.32 cm/s. The extent of CO diffusion was measured from the first and second band, in-between the bands and after the second band. CO diffusion through the base paper was 30% higher than CO diffusion through the bands. Nitrogen oxide (NO) diffusion through the base paper was about 24% higher than through the bands. A positive linear correlation was found between the band diffusion and the amount of CO diffused from the bands during cigarette smoking.