| Project/Area Number |
05556028
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
林産学
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| Research Institution | Tokyo University of Agriculture and Technology |
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Principal Investigator |
HATTORI Nobuaki Tokyo Noko Univ., Fac.Agriculture, Assoc.Prof., 農学部, 助教授 (90115915)
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| Co-Investigator(Kenkyū-buntansha) |
NISHIO Jiro Eidai Co.Ltd., R & D Inst., Leader, 総合研究所, 主任研究員
IMAMURA Yuji Kyoto Univ., Wood Research Ins., Assoc.Prof., 木質科学研究所, 助教授 (70151686)
ANDO Keisuke Tokyo Noko Univ., Fac.Agriculture, Assist.Prof., 工学部, 助手 (70262227)
KITAYAMA Shigeru Tokyo Noko Univ., Fac.Agriculture, Prof., 工学部, 教授 (10026502)
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| Project Period (FY) |
1993 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥6,200,000 (Direct Cost: ¥6,200,000)
Fiscal Year 1995: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1994: ¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 1993: ¥2,800,000 (Direct Cost: ¥2,800,000)
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| Keywords | Laser Processing / Carbon-Dioxide Laser / Wood / Incising / Fire Retardance / High Durability / Wood-Resin Compound / Acetylated Wood / 穴あけ / 複合化処理 / 耐火性 / 無機質複合化木材 |
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| Research Abstract |
To improve permeability of fluid in wood, laser incising was applied to die penetration into 150mm diameter poles of sugi (Cryptomeria japonica D.Don) and douglas-fir (Pseudotsuga menziesii Franco), to preservative penetration into 90mm square lumber and 90 * 210mm dimension lumber of hinoki (Chamaecyparis obtusa Endl.), sugi, douglas-fir and hemlock (Tsuga heterophylla Sarg.), to inpregnation of phenolic resin into 2 * 4 boards of douglas-fir and spruce (Picea abies Karst.), to composition of wood-inorganic chemicals for 20 * 220mm boards of douglas-fir and to acetylation of 2 * 4 boards of spruce using 1.7kW CO_2 laser.
In the case of preservative penetration into 90mm spquare lumber of hinoki, sugi, hemlock and douglas-fir, the irradiating energy of a pulsed laser beam ranged from 204J (1200W * 0.17s) to 312J (1200W * 0.26s) to make a pinhole over 90mm depth. If it is desirable that the penetrated area of zinc naphthenate from the pinholes is more than 90% of the sectional area, the incision densities have to be over 5.0 * 10^3 holes/m^2,6.7 * 10^3 holes/m^2,44.4 * 10^3 holes/m^2 for the permeable species (sugi and hinoki), hemlock and douglas-fir, respectively though the percentages of penetrated area for the permeable species and douglas-fir without the incision were under 70% and 40%, respectively.
It becomes clear that the permeability of fluid in wood can be improved remarkably using the laser incising as a pretreatment method.
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