Microwave Pretreatment of Logs for Saving Energy and Improving Paper Properties during Mechanical Pulping
The structure of wood is known to be an important parameter impacting the chemical diffusion process.Microwave pretreatment was found to increase the permeability of the wood by breaking the pit membranes and vessel cell ends.due to the steam pressure generated inside the wood.Breakage of pit membranes and vessel walls,due to microwave heating,substantially increased the accessibility of process chemicals to wood.As a result,the microwave pretreatment enabled us to pulp larger chips.Preliminary results showed that with this technology it is possible to pulp chips with 10mm thickness,compared with untreated chips of 6～8 mm thickness.In this study,chips were pre-treated at variety of power levels for various times,and microwave cooking of commercial poplar pulpwood chips were investigated as a pretreatment for Kraft pulping.CTMP of poplar pulpwood chips with microwave pretreatment was prepared too.The mechanical pulping trials resulted in significant energy saving,up to 15％ for the highest power level.In addition,there were improvements in hand sheet properties,including: +25％ burst index,+15％ tear index,and +13％ tensile index.
microwave Kraft pulping CTMP poplar chips pretreatment energy saving
LI DONG HAN QING WANG YA-JUAN ZHAN HUAI-YU
College of Papermaking Engineering,Shaanxi University of Science & Technology,Shaanxi,China,710021 State Key Laboratory of Pulp and Paper Engineering,South China University of Technology,Guangzhou,51
国际会议
第二届国际造纸与环境学术会议(The Second International Papermaking & Environment Conference)
天津
英文
346-349
2008-05-14（万方平台首次上网日期，不代表论文的发表时间）