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Effects of Heat Treatment on dimension stability of Larch Pallet Decks

Journal of Harbin Institute of Technology(New Series) 2013年第3期20卷 75-80页

作者： Xue-Chun Yang Bing Wang Jin-Zhuo Wu Xiao-Qi Xing Shi-Jun Yang College of Engineering and Technology Northeast Forestry University

The useful life of wooden pallets is lower because of the defects in lumbers. The quality of lumber can be significantly enhanced by heat treatment. In this paper,the larch pallet decks samples were heat-treated under the conditions of different time and temperatures. The quantity of water uptake has reduced 16. 8% under the condition of 250 ℃ for 150 min. The resistance of water absorption efficiency increases 165. 34% under the condition of 175 ℃ for 90 min. The anti-shrink efficiency increases 72. 08% under the condition of 250 ℃ for 90min. The results showed that the dimension stability of larch panels can be improved by heat treatment. The condition of 250 ℃ for 180 min is the best heat treating condition to improve the dimension stability.

关键词： larch pallet heat treatment resistance of water absorption efficiency anti-shrink efficiency dimension stability

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Heat-treated wood and its development in Europe

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Journal of Forestry Research 2002年第3期13卷 224-230,252页

作者：谢延军刘一星孙耀星东北林业大学材料与工程学院哈尔滨150040

Efficient use of timber is a vital concern problem, especially in these regions where the forestry coverage ratio is decreasing. Studies on physical modification of wood have been taken more attention due to the increasing attentions on environmental protection. Thermal modification is emphasized and developed quickly in developing countries, especially in European countries. A large number of researches have been conducted and some industrial production plants have been built. This paper reviewed the history of heat treatment, exemplifies the industrial developments in several European countries, summarized the basic principle of heat treatment and describes the environmental characteristics. The properties of heat-treated wood and its usage are also summed up.

关键词： Heat-treated wood Durability dimension stability Mechanical characteristics Industrial production

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EFFECT OF TIME AND ENVIRONMENT ON THE dimension PRECISION AND MASS OF LOM PROTOTYPES

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Transactions of Tianjin University 2001年第3期7卷 214-216页

作者：张连洪李华友天津大学机械工程学院天津300072 中信戴卡轮毂制造有限公司产品开发部秦皇岛066003

The effect of time and environment on the dimension precision and mass of LOM prototypes was experimentally *** is to identify the stability of the dimension of LOM prototypes after *** results show that the dimension and the mass tendency to grow,which is mainly caused by elastic recovery and moisture absorption and is characterized principally by the growth of Z *** restraint can be a significant factor to influence Z growth of LOM prototypes.

关键词： laminated object manufacturing (LOM) time effect dimension stability rapid prototyping

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