広葉樹気乾材への液体浸透

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  • コウヨウジュ キカンザイ エ ノ エキタイ シントウ

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The flow paths of liquids into air-dried hardwoods were studied using penetrating water or a 0.5% aqueous solution of Direct Sky Blue 6B with the capillary rise method and the vacuum impregnation method. In the longitudinal penetration by the capillary rise method, penetration rates into the fifty hardwoods showed wide variations (Table 2). Sapwood was more permeable than heartwood, except ENJYU, POPLAR, SHIOJI and YACHIDAMO. Liquid flow into the wood tissue was so irregular that many cells remained without penetration. Types of preferential penetration in longitudinal direction were classified into six groups (Table 5). Penetration to the radial and tangential directions were far less than that to the longitudina direction (Table 3 and 4). Ray tissue, except that of TOCHINOKI, was not effective in facilitating the radial penetration. In the penetration method using vacuum evacuation and subsequent atmospheric pressure, volume of the impregnated solution in sapwood was entirely dependent on the specific gravity of wood except KIRI. In heartwood the volume of the impregnated solution had no correlation to the specific gravity of wood (Fig. 3). After the vacuum impregnation, penetration range in the wood tissue showed wide variations with species (Table 6). In many species, penetration into fiber bundles and multiseriate rays were very difficult.

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