Penetration of liquid by passive impregnation method for Douglas-fir (Pseudotsuga menziesii Franco), sugi (Cryptomeria japonica D. Don) and Japanese larch (Larix leptolepis Gordon) were studied. Effects of initial moisture content of sugi (16, 43 and 70% moisture content) on liquid penetration by the method were also studied. Dried Douglas-fir and sugi, and green Japanese larch and sugi were treated by passive impregnation method for penetration analysis. It was observed that dried sugi had the highest amount of liquid penetration both in length (170 mm) and width (8 mm) for all measured sections following green sugi, green Japanese larch and dried Douglas-fir. In case of different initial moisture content, the highest absorption (624 kg/m3) and penetration (maximum 87 and 96% at cross and longitudinal surfaces, respectively) was observed for sugi having the lowest initial moisture content with the same passive impregnation conditions. Absorption and penetration decreased with the increase of initial moisture content for sugi. These results would help in designing incising pattern and density, and selecting the suitable initial moisture content for passive impregnation.

Download document (93 kb)
free for the members of IRG. Available if purchased.

Purchase this document