Improvement of Liquid Penetration of Wood by Precompression method

设计了一种利用预压处理提高木材吸液率的新系统，并对影响吸液率的各种因素进行了研究。得到的结果如下：1）在适当的水分和热量条件下，高达60%的预压缩有效地增加了液体渗透到耐火木材样品的实际尺寸，而不产生任何强度降低。2）集恢复木材中的负载后立即释放预压缩，和预固定木材的减压力的影响下干燥。固化回收材的吸液量是未处理材的2-3倍。当预先固定的木材浸渍在液体中，并释放变形力时，液体渗透是未处理的软木心材的25倍以上。当压力浸渍应用于预压缩和预固定的木材时，液体甚至可以有效地渗透长样品。 ...更多信息 观察到处理过的木材强度显著降低。压缩过程中孔膜的破裂对孔壁的损伤很小，而孔膜的弹性恢复过程对孔壁的损伤很小，从而提高了孔膜的渗透性，而压缩缺陷可以忽略不计（干或湿）和环境温度（室温，30 ℃或80 ℃）有效地增加了液体吸收不同的木材品种，即使在相同水平的压缩变形施加。在30 ℃湿态条件下预压缩时，花旗松的吸液量最大日本杉在80 ℃、北松在80 ℃处理条件下的光合速率差异不显著，而日本扁柏和日本落叶松在80 ℃、北松在80 ℃处理条件下的光合速率差异不显著（Karamatsu）。5）在染料溶液中液体吸收增加，其随样品的预压条件和环境温度而变化。6）SEM观察可视化了由于预压处理，软木的封闭边界凹坑的打开和硬木的容器中的纤维素的断裂，结果，耐火木材的液体渗透性显著提高。少

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 … More 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