Chemical Composition Analysis of Tobacco Stems and Research on Their Pulping and Papermaking Properties
This study prepared tobacco stem pulp fibers through hydrothermal pretreatment and mechanical pulping,and preliminarily produced paper by blending with bleached sulfate hardwood pulp.The chemical analysis of tobacco stems showed that the raw materials had relatively low lignin and holocellulose contents(lignin 5％～8％,holocellulose 29％～35％)and high contents of extractives and ash(extractives＞50％,ash～15％),making them suitable for producing mechanical pulp fibers.This research investigated the effects of hydrothermal pretreatment conditions,H2O2 bleaching process parameters,and blending conditions on the properties of tobacco stem pulp fibers and paper.Under the conditions of hydrothermal pretreatment at 80 ℃ for 90 min and bleaching with H2O2 dogage of 3％for 60 min,tobacco stem pulp fibers with a length of 0.395 mm,width of 32.3 μm,twist angle of 98°,and curl index of 15.3％were obtained.With the mass prepared tobacco stem fibers blended with hardwood pulp in a mass ratio of tobacoo stem pulp and bleached sulfate hardwood pulp was 3∶7,paper with a bulk thickness of 1.68 cm3/g,a brightness of 62.1％,opacity of 94.6％,tear index of 5.92 mN'm2/g,and tensile index of 33.8 N·m/g was produced.
tobacco stem raw materialbleached sulfate hardwood pulpfiber morphologyphysical properties
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