Liquid impregnation of dry wood using a roller-pressing method, 1: Effect of transverse compressive deformation on liquid impregnation
2003
Adachi, K. (Kyoto Univ., Uji (Japan). Wood Research Inst.) | Inoue, M. | Kanayama, K. | Kawai, S.
Liquid impregnation treatment into dry wood was studied using roller-pressing and platen-pressing methods. Four types of treating methods, i, e., 1) pre-platen pressing 2) in-liquid platen pressing 3) pre-roller pressing, and 4) in-liquid roller pressing were used, and the effects of transverse compressive deformation on liquid impregnation were compared. Sugi (Cryptomeria japonica D. Don) flat-sawn lumber of 12% moisture content with the dimensions of 300 (L) * 90 (R) * 4 mm (T) was soaked for three minutes under atmospheric pressure after 60% compression by the treating methods described above. As a result, the average moisture content increased to 59%, 63%, 106% and 109%, respectively. In-liquid pressing methods gave higher values of liquid impregnation. This is due to the recovery of elastic compressive deformation immediately after unloading and accelerated recovery of residual deformation by the penetration of water into the cell wall after soaking. During in-liquid pressing, cyclic compression of the specimens caused a suction force after unloading which increased the amount of liquid impregnation remarkably. The roller-press method, which produces unidirectional fluid flow in the lumen yielded higher values of the liquid impregnation than platen pressing.
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