Development of Property Enhanced Wood by Laser Incising

为了提高木材中流体的渗透性，采用激光切割技术对直径150mm的杉木（Cryptomeria japonica D.Don）和道格拉斯杉木（Pseudotsuga menziesii Franco）的杆材进行模具渗透，对90mm方形木材和90 * 210mm尺寸的杉木（Chamaecyparis obtusa Endl.）、杉木、道格拉斯杉木和铁杉（Tsuga heterophylla Sarg.）木材进行防腐渗透，对道格拉斯杉木和云杉（Picea abies Karst.）的2 * 4板进行树脂浸渍。到20 * 220mm道格拉斯冷杉板的木材无机化学品的合成，以及使用1.7kW CO_2激光对2 * 4云杉板进行乙酰化。在将防腐剂渗透到90mm的红木、杉木、铁杉和道格拉斯冷杉等木材中，脉冲激光束的照射能量在204J （1200W * 0.17s）到312J （1200W * 0.26s）之间，形成一个超过90mm深度的针孔。如果希望针孔穿透环烷酸锌的面积大于截面积的90%，则可穿透树种（杉木和杉木）、铁杉和道格拉斯冷杉的切口密度必须分别大于5.0 * 10^3孔/m^2、6.7 * 10^3孔/m^2、44.4 * 10^3孔/m^2，而不进行切口的可穿透树种和道格拉斯冷杉的穿透面积百分比分别小于70%和40%。结果表明，采用激光切割作为预处理方法可以显著提高木材中流体的渗透率。

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.