Improvement of Liquid Penetration of Wood by Precompression method

设计了一种利用预压缩处理来提高液体在木材中的渗透性的新系统，并评价了多种因素对液体吸收的影响。得到的结果如下：1)在适当的湿热条件下进行高达60%的预压缩，有效地增加了液体在实际尺寸的耐火木材样品中的渗透率，而不会产生任何强度降低。2)预压后立即释放载荷的固结回收木材，以及在减压力影响下干燥的预置固定木材。固定回收木材的吸液量是未经处理木材的2-3倍。当预先固定的木材浸泡在液体中并释放变形力时，液体渗透率是未经处理的软木心材的25倍以上。当对预压缩和预固定的木材进行压力浸渍时，液体甚至可以有效地渗透到较长的试件中。3)不是S…观察到经处理的木材的强度降低更显著。压缩过程中凹坑膜的破裂对无孔细胞壁的损害很小，弹性恢复过程被认为可以提高液体渗透率，而压缩缺陷可以忽略不计。4)在不同的样品含水率(干或湿)和不同的环境温度(室温，30ﾟC或80ﾟC)下，预压缩至50%的变形有效地增加了木材物种间的液体吸收率，即使在施加相同水平的压缩变形时也是如此。在30ﾟC和80℃湿压缩条件下，豆杉(北松)和日本雪松(Sugi)的吸液量最大，而日本柏木(Hinoki)和日本落叶松(Karamatsu)的处理条件没有显著差异。5)染料溶液中的吸液量增加，这与试件的预压条件和环境温度有关。6)扫描电子显微镜观察到，由于预压处理，软木的封闭边缘凹坑的打开和硬木容器中的板条断裂，导致耐火木材的液体渗透率显著提高。较少

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