慈竹蒸煮过程木质素溶出和纤维形态变化研究OA

This study used Neosinocalamus affinis as the raw material to investigate the effect of pulping conditions on lignin dissolution and fiber morphological evolution.During the process of sulfate pulping,with the increase of alkali dosage,maximum cooking temper-ature,and time at the maximum temperature as well as sulfidity effect of Neosinocalamus affinis was improved,the remove effect of lig-nin was enhanced,and the fiber morphology was optimized.Under the condition of alkali dosage of 18%(based on NaOH measure-ment),maximum cooking temperature of 160℃,time at the maximum temperature of 120 min,and sulfidity of 25%,with the resulting bamboo pulp exhibited a yield of 49.2%,Kappa value of 17.7,fiber length and width of 1.620 mm and 20.60 µm,respectively,with a content of fine fibers of 2.6%,curling index of 5.7%,and the crystallinity index of 66.4%.In addition,the increase in alkali dosage decreased the Kappa value by 1.10/%,the increase in the maximum cooking temperature decreased the Kappa value by 0.35/℃,the increase in the time at the maximum temperature decreased the Kappa value by 0.11/min,and the increase in sulfidity decreased the Kappa value by 0.41/%,the Kappa value was relatively sensitive to the alkali dosage,but relatively insensitive to the time at the maxi-mum temperature.The removal effect of lignin could be enhanced by increasing the alkli dosase and reducing the time at the maxi-mum temperature.Under strengthened cooking condition,the fi-ber length and width decreased slightly,whereas the fiber curl in-dex increased.