LI Wanzhao,CHEN Yuyu,MEI Changtong*.Exploration of water transport behavior among layers in plywood[J].Journal of Forestry Engineering,2019,4(05):29-33.[doi:10.13360/j.issn.2096-1359.2019.05.004]



木材科学与技术 执行主编:吴义强 梅长彤


Exploration of water transport behavior among layers in plywood
1.南京林业大学材料科学与工程学院,南京 210037; 2.常州纺织服装职业技术学院,江苏 常州 213164
LI Wanzhao1 CHEN Yuyu2 MEI Changtong1*
1.College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China; 2.Changzhou Vocational Institute of Textile and Garment, Changzhou 213164, Jiangsu, China
胶合板 胶层 结构变化 水分迁移 X射线断层扫描仪
plywood glue line structural change water transport X-ray computed tomography
As a panel raw material, wood has the advantages of low energy consumption and CO2 emission as well as high strength/weight ratio.Plywood is an important engineered wood product manufactured by bonding veneers together.The grain of alternate veneers is arranged to cross at right angles, minimizing the effect of strength anisotropy in the panel.These advantages contribute to a wide application of plywood in outdoor environment.Considering wood is prone to water sorption, water sorption can result in structural instability, strength decrease and decay risk of plywood.Increasing water resistance is crucial for enlarging the application fields and increasing service life of plywood.Glue line between veneers is a typical characteristic of plywood differentiated from solid wood, which has a great influence on water transport behavior in plywood.It is, therefore, necessary to explore the interaction between the water transport behavior and glue line changes.Water distribution and glue line changes in two types of plywood and poplar solid wood were continuously monitored using a gantry-based X-ray computed tomography scanner.Two types of plywood were glued with phenol formaldehyde(PF)and melamine modified urea-formaldehyde(MUF)resins, respectively.The results showed that the water transportation in poplar was mainly along the fiber direction and water could hardly transport along the other directions.Water penetrated glue line between veneers was consisted of four steps that could occur sequentially or simultaneously, which were that, resulted from water adsorption the wood swelled, gaps between veneers appeared in glue line, water accumulated in gaps, and water penetrated to the next layer.The water favored to transport in the regions with high density and structural ruptures of a veneer.These structural ruptures could be induced during peeling veneers.MUF glue line kept consecutive even after the 24 h water sorption.For PF resin, the glue line became non-consecutive after the 4 h water sorption.The different structural stabilities of the glue lines resulted in the different water resists.Specifically, the MUF glue was more water resist than the PF glue.The water distribution and structural deformation of the glue lines were dynamically visualized in this study.Finally, the mechanisms of water transportation between veneers were revealed.The results obtained from this study could be used in optimizing the processing technology and application approaches of wood-based panels.


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收稿日期:2019-01-09 修回日期:2019-03-07
基金项目:江苏省自然科学基金(BK20170923); 江苏省高等学校自然科学研究项目(17KJB220003)。
作者简介:李万兆,男,副教授,研究方向为木质复合材料。通信作者:梅长彤,男,教授。E-mail: mei@njfu.edu.cn
更新日期/Last Update: 2019-09-10