IMPACT OF COOKING HOMOGENEITY ON PULP STRENGTH PROPERTIES

编号 zgly0000332844

文献类型 期刊论文

文献题名 IMPACT OF COOKING HOMOGENEITY ON PULP STRENGTH PROPERTIES

学科分类 220.5570;林产化学加工学

作者 BofengMao 

作者单位 StoraEnsoPulpCompetenceCentreBox909065009KarlstadSweden 

母体文献 天津科技大学学报 

年卷期 2004,19(A01)

页码 101-105

年份 2004 

分类号 TS74 

关键词 蒸煮  均匀性  牛皮纸浆  强度  浸渍  软木化学制浆 

文摘内容 Cooking homogeneity of kraft pulping can havesignificant impact on pulp strength properties. Wehave studied cooking homogeneity of two kraftdigesters within Stora Enso. One of the digesters is aone-vessel hydraulic continuous digester (digester A)and the other one is a two-vessel vapor/liquor phasecontinuous digester (digester B). They are located inthe same mill and use the same softwood chipquality. Due to the differences in chip pre-steamingand cooking facilities and conditions, significantdifferences in pulp strength properties, reject contentsand kappa variations have been found between thepulps produced in the two digesters. Digester A has amodem chip bin with efficient pre-heating and airremoval, whereas digester B has poor chippre-steaming conditions. Our strength deliverystudies show that although the two digesters producepulps with the same kappa number and viscosity, thepulp produced in digester A has about 20% higherstrength delivery, l%-unit (based on wood) lowerreject content and lower kappa variations based onFTIR spectra analysis on pulp sheet than the pulpproduced in digester B.Results of the studies indicate that morehomogeneous cooking,variation in the fibers,i.e., lower lignin/kappa leads to improved pulpstrength properties. Efficient chip pre-steaming isimportant/essential for achieving homogeneouscooking. Rebuilding the equipment for improvingchip pre-steaming conditions of digester B is to becarded out。