Improvement of Liquid Penetration of Wood by Precompression method
Grant-in-Aid for Developmental Scientific Research (B).
|Research Institution||Kyoto Prefectural University|
IIDA Ikuho Agriculture, Kyoto Pref.Univ., Lecturer, 農学部, 講師 (40046503)
柏 直樹 フクビ化学工業KK, 開発本部, 研究員
中村 嘉明 奈良県林業試験場, 木材化学課, 総括研究員
IMAMURA Yuji Wood Research Institute, Kyoto Univ., Associate Professor, 木質科学研究所, 助教授 (70151686)
KASHIWA Naoki Research & development division, Fukuvi Chemical Industry Co, Ltd. Researcher
NAKAMURA Yoshiaki Nara Pref.Forest Exp.Stn.General Researcher
|Project Fiscal Year
1993 – 1994
Completed(Fiscal Year 1994)
|Budget Amount *help
¥4,000,000 (Direct Cost : ¥4,000,000)
Fiscal Year 1994 : ¥1,500,000 (Direct Cost : ¥1,500,000)
Fiscal Year 1993 : ¥2,500,000 (Direct Cost : ¥2,500,000)
|Keywords||Large deformation / Fractured pitting / liquid penetration / Refractory wood / Precompressive method / Recovery force / solution uptake / Plasticity / 横圧縮大変形 / 壁孔破壊 / 浸透促進 / 難注入性木材 / 圧縮法 / 変形回復力 / 注入量 / 可塑化|
A new system for enhancing the penetration of liquid into wood using a precompression treatment was designed, and the effects of the many factors on the liquid uptake were evaluated. Results obtained are as follows :
1) Precompression of up to 60% under appropriate moisture and heat conditions effectively increased the penetration of liquid into refractory wood samples of practical sizes without producing any strength reduction.
2) Set-recovered wood in which loading was released immediately after precompression, and preset-fixed wood which was dried under the influence of a decompression force. The amount of liquid takes up by set-recovered wood was 2-3 times that taken up by untreated wood. When preset-fixed wood was dipped in liquid and the deforming force was released, liquid penetration was more than 25 times that seen in untreated softwood heartwood. Liquid effectively penetrated even long samples when pressure impregnation was applied to precompressed and preset-fixed wood.
3) No s
ignificant reduction of strength was observed for treated wood. Fracture of pit membranes during compression with little damage to unpitted cell-walls and an elastic recovery process were believed to improve liquid penetration with negligible compression defects.
4) Precompression up to 50% deformation under the different condition of moisture content of specimen (dry or wet) and ambient temperature (room-temperature, 30ﾟC or 80ﾟC) effectively increased the liquid uptake differed within wood species even when the same level of compressive deformation was applied. The maximum amount of liquid uptake was recognized when precompressed under the wet condition at 30ﾟC for Douglus-fir (Beimatsu) and 80C for Japanese cedar (Sugi), but no significant difference was observed among the treatment condition for Japanese cypress (Hinoki) and Japanese larix (Karamatsu).
5) The liquid uptake increased in dye-solutions, which varied upon the precompression conditions of specimens and ambient temperature.
6) SEM observations visualized the opening of the enclosed bordered pits for softwood and the fracture of tyloses in the vessel for hardwood due to precompression treatment, as a result the liquid penetration was remarkably improved for refractory wood. Less
Research Output (19results)