The problem of liquid penetration into wood, and measurement of this characteristic is important for the specialists who are interested in the technology of wood preservation and treatment by liquids (Kollmann and Cote, 1968; Siau, 1971; Marcok, 1988) One of the possibilities to increase the liquid penetration into wood is the use of ultrasound. It was shown in earlier experiments (Fairbanks, 1978), that ultrasound waves of high intensity (above 0.3-10* Win"3) can be used in the different processes of the flow of liquids into the porous materials.
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