Xylanase on Bleaching of Chemical Pulp Poplar

Bleaching of poplar Kraft pulp with chlorine dioxide assisted by xylanase was investigated.The results are big effect on bleaching as to dioxide chlorine bleaching,xylanase treatment position.In the first D stage,xylanase treatment time of 40 minutes then adds dioxide chlorine has better effect on promoting synergism between them,however,xylanase treatment of 50 minutes then adds alkali in E stage is more preferable,and in the second D stage xylanase treatment of 30 minutes has better synergism promoting.