烟粉粒径及其分布对稠浆法烟芯薄片性能的影响

Effect of Tobacco Powder Particle Size and Its Distribution on Properties of Slurry-type Reconstituted Tobacco Leaf

关键词:  粒径分布  稠浆法  烟芯薄片  抗张强度

Key Words:particle size distribution  slurry process  reconstituted tobacco leaf  tensile strength

摘要:利用5组不同粒径的烟粉配制稠浆并制备烟芯薄片，研究单一粒径烟粉、连续级配混合烟粉对稠浆特性及烟芯薄片性能的影响规律，分析烟粉粒径分布对薄片性能的影响作用，优选出适宜的烟粉级配方案。结果表明，随着烟粉粒径的减小，稠浆黏度降低，薄片紧度、抗张强度增加，采用小粒径烟粉制备的薄片强度好但紧度过高，80目至≥200目4种粒径烟粉以0.2的级配系数混合时，制备的薄片各项性能较优，对比具有同等平均粒径、不同粒径分布的烟粉，较宽的粒径分布更利于薄片的强度，综合考虑稠浆及薄片性能，较优的烟粉混合条件为80目至≥200目4种粒径烟粉分别占比32.2%、13.0%、12.8%及42.0%，此时薄片紧度0.72 g/cm³，抗张强度可达0.549 kN/m。

Abstract:Five groups of cigarette powder with different particle sizes were used to prepare slurry-type reconstituted tobacco leaf （RTL）. The impact characteristics cigarette powder with single mesh size and continuously graded mixed cigarette powder on the properties of slurry and RTL were revealed， the effects of particle size distribution on RTL properties were analyzed， to find out optimal particle size and grading scheme of cigarette powder. The results showed that， as the particle size of tobacco powder decreased， the viscosity of the slurry decreased， and the density and tensile strength of RTL increased. Using small particle size tobacco powder could prepare RTL with better strength but excessively high density. Mixed four particle sizes of tobacco powder from 80 mesh to ≥200 mesh with a grading coefficient of 0.2， the tensile strength and thickness of RTL were suitable. Comparing tobacco powder with the same average particle size but different size distribution， a wider particle size distribution was more conducive to the strength property of RTL. Taking into account the properties of slurry and RTL， the optimal mixing conditions for tobacco powder were as follows： the proportion of four particle sizes of tobacco powder from 80 to ≥200 mesh was 32.2%， 13.0%， 12.8%， and 42.0%， respectively， the density was 0.72 g/cm³， and the tensile strength was 0.549 kN/m.