Study on Refining Performances in Chemi-mechanical Pulping of Mixed Poplar and Eucalypt Woodchips  

作　　者：Yu Shi Qun Li Yujia Zhang 

机构地区：[1]Sinolight(Jinjiang)Hygiene Products Research Co.,Ltd,Jinjiang,Fujian Province,362200,China [2]Tianjin Key Lab of Pulp and Paper,Tianjin University of Science and Technology,Tianjin,300457,China [3]KTH Royal Institute of Technology,Stockholm,SE-10044,Sweden

出　　处：《Paper And Biomaterials》2019年第4期51-56,共6页造纸与生物质材料（英文）

摘　　要：The refining performances of mixed poplar and eucalyptwoodchips(mixture ratio 6:4)were investigated at medium and highpulp consistency via chemi-mechanical pulping(CMP).The specificrefining energy consumption(SEC),fiber fraction proportion,andCanadian standard freeness(CSF)were determined to evaluate the effectsof pulp consistency and NaOH dosage on the refining performancesof mixed poplar and eucalypt woodchips.While the dosage of NaOHfor impregnation was maintained constant,the SEC and shive contentincreased with increasing pulp consistency.Different fractions obtainedfrom the Bauer-McNett classifier showed that higher pulp consistencycould be expected to yield more long fibers and shive in the stock.Upon increasing the NaOH dosage,the shive content and SEC reducedsignificantly.When the NaOH dosage was increased to 6%,the resultsindicated that it was difficult to reduce the shive content to less than 1%athigh pulp consistencies(25%~35%),whereas 0.18%shive fraction couldbe achieved at a medium pulp consistency(15%).The refining performances of mixed poplar and eucalypt woodchips(mixture ratio 6:4) were investigated at medium and high pulp consistency via chemi-mechanical pulping(CMP). The specific refining energy consumption(SEC), fiber fraction proportion, and Canadian standard freeness(CSF) were determined to evaluate the effects of pulp consistency and Na OH dosage on the refining performances of mixed poplar and eucalypt woodchips. While the dosage of Na OH for impregnation was maintained constant, the SEC and shive content increased with increasing pulp consistency. Different fractions obtained from the Bauer-Mc Nett classifier showed that higher pulp consistency could be expected to yield more long fibers and shive in the stock. Upon increasing the Na OH dosage, the shive content and SEC reduced significantly. When the Na OH dosage was increased to 6%, the results indicated that it was difficult to reduce the shive content to less than 1% at high pulp consistencies(25%～35%), whereas 0.18% shive fraction could be achieved at a medium pulp consistency(15%).

关 键 词：mixed woodchips chemi-mechanical PULPING specific refiningenergy consumption PULP consistency fiber characteristics 

分 类 号：TS7[轻工技术与工程—制浆造纸工程]