关键词: 纳米纤维素, 再造烟叶, 松厚度, 抗张强度, 热解性能, 粒相物

Abstract: In order to improve the physical properties of the reconstituted tobacco, two kinds of nanocellulose （cellulose naonocrystals, CNC and cellulose nanofibril, CNF） were used to replace part of wood pulp fiber, respectively. The effects of nanocellulose on the bulk and tensile strength of reconstructed tobacco were compared, and the better effective cellulose fiber was selected to investigate the effects of nanocellulose with different additions on the bulk, tensile strength and pyrolytic properties of reconstructed tobacco. Then the effects of nanocellulose on particulate composition in the mainstream smoke of reconstructed tobacco were studied. The results showed that under the same wood pulp fiber supplemental amount, the effect of adding CNF on improving the tensile strength of reconstituted tobacco was stronger than that of CNC, and both additions had no significant effect on the bulk of reconstituted tobacco. Adding CNF to the tobacco slurry could effectively increase the tensile strength of the reconstituted tobacco substrate. With the increase of the amount of CNF, the tensile strength of the reconstituted tobacco increased. The thermal stability of the reconstituted tobacco increased with the increase of the amount of CNF, T_-5%, T_-50% and the final residue increased gradually, but the T_max did not change significantly. The addition of small CNF had no significant effect on the composition of the mainstream smoke particles in the reconstructed tobacco. The addition of CNF could effectively replace part of wood pulp fiber, thus reducing the amount of wood pulp fiber, improving the tensile strength of reconstituted tobacco, and also improving the thermal stability of reconstituted tobacco, which provided a new idea for the development of new reconstituted tobacco to meet the requirements of processing technology.

Key words: nanocellulose, reconstituted tobacco, bulk, tensile strength, pyrolytic property, particulate matter