加压热处理对表层压缩杨木变形回弹的影响
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摘要
以水热控制法对人工林毛白杨木材进行间歇式压缩,获得表层密度1.0 g/cm~3、芯部密度基本不变的表层压缩木;再在常压和0.3 MPa压力下,分别对表层压缩木材进行热处理,检测热处理后木材的变形回弹率。结果表明,随着热处理温度升高,表层压缩木材变形回弹率呈降低趋势;加压热处理比常压热处理,对表层压缩木材的变形固定效果更优。200℃、0.3 MPa加压热处理,能够使杨木压缩材的厚度变化率降低67.38%。
Poplar specimens(Populus tomentosa)from plantation grown trees were intermittently pressed by a hydro-thermal method to make surface compressed wood.The surface density of the wood was 1.0 g/cm~3 with unchanged inner density.The surface compressed wood was then treated with 0.3 MPa of pressurized steam and normal pressure steam, respectively.It showed that the spring ratio of compressive deformation of the wood decreased as treating temperature increased and that the wood treated with pressurized steam performed better than the wood treated with normal pressure steam as far as fixation of compressive deformation was concerned.The thickness change of the wood could be decreased by 67.38% by treatment under 200 ℃ and 0.3 MPa pressure.
Poplar specimens(Populus tomentosa)from plantation grown trees were intermittently pressed by a hydro-thermal method to make surface compressed wood.The surface density of the wood was 1.0 g/cm~3 with unchanged inner density.The surface compressed wood was then treated with 0.3 MPa of pressurized steam and normal pressure steam, respectively.It showed that the spring ratio of compressive deformation of the wood decreased as treating temperature increased and that the wood treated with pressurized steam performed better than the wood treated with normal pressure steam as far as fixation of compressive deformation was concerned.The thickness change of the wood could be decreased by 67.38% by treatment under 200 ℃ and 0.3 MPa pressure.
引文
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[14]沈德君,吴桂华.不同处理方法对杨树木材压缩变形回弹率的研究[J].吉林林业科技,2008,37(5):34-36.
[15]王洁瑛,赵广杰.木材变定的产生、回复及其永久固定[J].北京林业大学学报,1999,21(3):71-76.
[2]Jiabin Cai,Tao Ding,Liu Yang.Dimensional stability of poplar wood after densification combined with heat treatment[J].Applied Mechanics and Materials,2012,152-154:12-116.
[3]Cheng Zhou,Gregory D Smith,Chunping Dai.Characterizing hydro-thermal compression behavior of Aspen wood strands[J].Holzforschung,2009,63(5):1-9.
[4]夏捷,黄荣凤,吕建雄,等.水热预处理对毛白杨木材压缩层形成的影响[J].木材工业,2013,27(4):42-45.
[5]Rongfeng Huang,Yanwei Wang,Jianxiong Lu,et al.Sandwich compression of wood by hygro-thermal control[J].Mokuzai Gakkaishi,2012,58(2):84-89.
[6]Anjaneya Prasad Penneru,Krishnan Jayaramanand Debes Bhattacharyya.Viscoelastic behaviour of solid wood under compressive loading[J].Holzforschung,2006,60(3):294-298.
[7]黄荣凤,吕建雄,曹永健.热处理对毛白杨木材物理力学性能的影响[J].木材工业,2010,24(4):5-8.
[8]郭飞.高温热处理对马尾松蓝变材性能的影响及其聚类分析[D].北京:中国林业科学研究院,2015.
[9]王艳伟,黄荣凤,张耀明.水热控制下杨木的表层密实化及固定技术[J].木材工业,2012,26(2):18-21.
[10]江京辉,吕建雄,周永东,等.水蒸气热处理对人工林杉木性质的影响[J].木材工业,2015,29(2):13-16.
[11]Masafumi Inoue,Misato Norimoto,Mitsuhiko Tanahashi,et al.Steam or heat fixation of compressed wood[J].Wood and Fiber Science,1993,25(3):224-235.
[12]Zhiqiang Gao,Rongfeng Huang,Jianxiong Lu,et al.Sandwich compression of wood:Control of creating density gradient on lumber thickness and properties of compressed wood[J].Wood Science and Technology,2016,50(4):833-844.
[13]陈太安,蒋明,王昌命,等.后期热处理对压缩木尺寸稳定性的影响[J].西南林业大学学报,2011,31(4):54-57.
[14]沈德君,吴桂华.不同处理方法对杨树木材压缩变形回弹率的研究[J].吉林林业科技,2008,37(5):34-36.
[15]王洁瑛,赵广杰.木材变定的产生、回复及其永久固定[J].北京林业大学学报,1999,21(3):71-76.