PROLONGED WOOD STORAGE CAUSES MAINLY BRIGHTNESS PROBLEMS FOR TMP

摘要：

During summer-time storing wood loses moisture and brightness. Storing induced wood dryness may cause problems in mechanical pulp production. Norway spruce logs were stored in piles over summer and compared to fresh wood as a raw material for TMP. The reduced wood moisture content does not require changes in thermomechanical pulping as long as the moisture content remains above the fiber saturation point. The amount of colored substances in wood increases already during the storing, and further in the refining, resulting reduced pulp brightness. This brightness loss can be mostly recovered by peroxide bleaching. However, at high brightness levels of 75％~80％, the use of stored wood can increase the required peroxide charge by 8~12 kg/BDt. Combined washing and pressing treatment of the chips provides further brightness improvement.

关键词： thermomechanical pulp wood storage brightness bleaching chip pretreatment

作者: Jari Sirvi(o) Airi S(a)kilahti Tiina Liiti(a) Antti Fredrikson Lauri I. Salminen Ilkka Nurminen

作者单位: VTT Technical Research Centre of Finland,P.O. Box 1000,FI-02044 VTT, Finland

会议类型: 国际会议

会议名称: International Mechanical Pulping Conference 2011(2011国际机械浆学术会议)

会议地点: 西安

会议语种:英文

页码: 23-26

在线出版日期: 2011-06-26（万方平台首次上网日期，不代表论文的发表时间）