Study On The Relationship Between The Pore Structure Of Cigarette Paper And The Yield Of Carbon Monoxide In Mainstream Smoke

“Smoking and Health” has attracted increasing attention. Reducing the amount of harmful ingredients in mainsmoke can make cigarettes less harmful. Carbon monoxide is one of the highest levels of harmful components in mainstream smoke and is also one of the hardest substances to remove from cigarette smoke. Nowadays, the most commonly used methods of reducing carbon monoxide are changing the ingredient, dilution ventilation, adsorption and catalytic oxidation. Dilution ventilation is the most effective way to be used in industry. This method can effectively reduce carbon monoxide in mainstream smoke, but excessive used will cause negative sensory taste. Adsorption and catalytic oxidation are frequently used in basic research, but there are some technical problems applied in industrial production and the problem of high production cost. Based on not changing the cigarette flavour and not increasing the cost of production, reducing carbon monoxide emissions in mainsream smoke selectively is a new direction in the development of the tobacco industry.This study without changing the basis weight and permeability, developed a low CO release of cigarette paper, using the cigarette paper can improve the combustion process, increase the number of pores near the char line, promote the spread ability of CO in mainstream smoke, so as to achieve the purpose of reducing CO emission selectively. Studieshave shown that using the low CO release of cigarette paper under the premise of without changing the basis weight, can effectively reduce CO emission more than 10%, and without increasing production cost.The research content of this paper:1. By adjusting the proportion formula of cigarette paper, ciagartte papers with different pore structure were preparated and investigated the impact on the CO emission in mainstream smoke. The results show that increasing calcium carbonate content and particle size, increasing the K/Na of accelerant, increasing thickness and basis weight, using no rib cigarette paper, all can effectively decrease CO emission. Length and short fiber ratio, the type of combustion improver, guar gum content, degree of fiber longitudinal arrangement less affected the CO emission in mainstream. Added porogen to cigarette paper increased the content of CO in mainstream smoke.2. A varity of characterization methods was used to study the pore structure near the char line. The relationship between pore structure near the char line and the emission of carbon monoxide in mainstream smoke was studied. TGA results showed that cigarette paper at 250 oC weightlessness is obvious, so 250 oC baking was chose to simulate the state near the char line of cigarette paper. Test results of diffusion rate and air permeability showed that after baking air permeability and diffusion rates of cigarette paper increased significantly, thus contributing to thedilution and diffusion of CO in mainstream smoke. Nitrogen adsorption-desorption and mercury Characterization results showed that after baking the total pore volume increased, especially the larger pore volume and the larger increasing rate of pore volume pore size range from 0.1 μm to 8.0 μm, the amount of CO release in the mainstream smoke is lower. Scanning electron microscopy(SEM) characterization results showed that the more micropore near the char line, the smaller equivalent pore diameter, the pore size distribution more homogeneous, the amount of CO release in the mainstream smoke is lower.3. The developed low-CO releasing cigarette paper was used in different cigarette products cigarette A cigarette B cigarette C cigarette D cigarette D cigarette E cigarette E without changing the basic formula and other ciagarette auxiliary. The Cigarette A and Cigarette B results showed that CO delivery decreased by 1.31 mg/cig, the yield of tar decreased 0.60 mg/cig, cigarette hazard index H value decreased from 8.08 to 7.36, 8.57%lower. Cigarette sensory evaluation results show that the cigarette paper does not change the sensory quality of cigarettes, with promotion prospects.