Preparation And Performance Study Of Cooling Non-woven Materials For Non-burning Cigarette Filter Rods

Heat rather than burn tobacco is a new type of tobacco product.By heating the tobacco under the temperature lower than the burning temperature,nicotine and flavor components in the tobacco are released into the flue gas,while the tobacco does not burn,effectively reducing the production of harmful substances.At present,a big problem of the product is that the user will feel the flue gas temperature is too high when he inhales with a large mouth,which affects the use experience.First of all,based on the principle of heat transfer,the heat transfer model of flue gas and filter tip is established.The factors that affect the temperature of flue gas are fiber diameter,material,whether the fiber has phase change or not,and the porosity of filter rod.Then,the spunlaced nonwovens with different mixing ratio of acetate fiber,temperature regulating fiber and stainless steel fiber were designed and prepared for the preparation of cigarette filter rod,and the preparation process of nonwovens was studied.In the end,a set of testing device for the cooling performance of the filter is designed and built,and the experiment is carried out by using the device.The influence rules of the filter filling rate,the fineness of acetate fiber,the temperature regulating fiber and stainless steel fiber on the flue gas cooling are analyzed.The experimental results are discussed in depth based on the theory,and the pressure drop of the prepared filter rod is tested.The cooling effect and pressure drop are combined for comprehensive evaluation The performance of the filter rod is evaluated.The conclusions are as follows:(1)The higher the filling rate of filter,the better the cooling effect.When the filling rate of filter rod is lower than that of nonwovens,the increase of filling rate will greatly improve the cooling performance of filter rod,while when the filling rate of filter rod is higher than that of nonwovens,the increase of the cooling effect of flue gas will decrease.With the increase of fiber filling rate,the pressure drop of filter rod is also significantly increased.Therefore,when considering the design of filter rod,it is necessary to control the pressure drop under the acceptable premise and moderately increase the fiber filling rate.(2)There is no significant difference between the cooling effect of 3.0D acetate fiber and 8.0D acetate fiber,and the difference between the average flue gas temperature of the two at a 6% filter rod filling rate is about 1.2%.The air temperature is slightly lower,but the pressure drop of the 8.0D acetate fiber filter rod is significantly smaller than that of the 3.0D acetate fiber.Therefore,the 8.0D acetate fiber is more suitable as a cooling filter rod material than the 3.0D acetate fiber.(3)The temperature-controlling fiber containing phase-change material has a significant cooling effect on flue gas.Compared with acetate fiber,100%temperature-controlling fiber has a temperature reduction range of 8% in the third port to the fifth port,and the filter rod The higher the proportion of the temperature-adjusting fiber,the better the cooling effect,the longer the effective cooling time,and the lower the pressure drop of the filter rod;the stainless steel fiber has no obvious cooling effect on the flue gas,and the proportion of 60% stainless steel fiber mass Compared to pure acetate fiber,the average flue gas temperature at a6% filter rod filling rate decreases by about 2%,and the pressure drop of the filter rod increases as the proportion of stainless steel fiber increases Gradually increased.Therefore,the temperature-lowering effect and pressure drop effect of the temperature-adjusting fiber are better than that of stainless steel fiber.