Murata Koji, Watanabe Yashuhiro, Nakano Takato
Division of Forest and Biomaterials Science, Graduate School of Agriculture, Kyoto University, Kitashirakawa oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan.
Canon Inc., Ota-ku, Tokyo 146-8501, Japan.
Materials (Basel). 2013 Jan 30;6(2):410-420. doi: 10.3390/ma6020410.
A large amount of poplar plywood is now being imported into Japan from China, and as a result, formaldehyde emitted from this plywood represents an undesirable chemical that must be controlled using a chemical catching agent. The aim of this study is to find an approach to reduce the formaldehyde emission of poplar plywood using thermal treatment without employing any chemicals. The experimental results obtained show that heating veneer sheets in the temperature range of 150 °C to 170 °C effectively reduced the formaldehyde emission of plywood, without diminishing the mechanical properties of the veneer. By applying Langmuir's theory and Hailwood-Horrobin theory to the adsorption isotherm obtained in this study, the relationship between the formaldehyde emission of plywood and the adsorption properties of veneer as a material is discussed. When veneer sheets were heated in the temperature range of 150 °C to 170 °C, the amount of hydrated water (monomolecular layer) decreased slightly and that of dissolved water (polymolecular layer) did not change. It is hypothesized that the formaldehyde emission of plywood is related to the condition of the adsorption site of the wood.
目前，大量杨木胶合板正从中国进口到日本，因此，这种胶合板释放的甲醛成为一种不良化学物质，必须使用化学捕捉剂加以控制。本研究的目的是找到一种不使用任何化学物质，通过热处理来降低杨木胶合板甲醛释放量的方法。所获得的实验结果表明，在150℃至170℃的温度范围内加热单板，能有效降低胶合板的甲醛释放量，且不会削弱单板的机械性能。通过将朗缪尔理论和海尔伍德 - 霍罗宾理论应用于本研究中获得的吸附等温线，探讨了胶合板甲醛释放量与作为材料的单板吸附性能之间的关系。当单板在150℃至170℃的温度范围内加热时，结合水（单分子层）的量略有减少，而溶解水（多分子层）的量没有变化。据推测，胶合板的甲醛释放量与木材吸附位点的状况有关。
