Abstract:

In this paper, the 25 mm thick poplar（Populus tremula）, birch（Betula platyphylla） and the oak（Quercus mongolica） by microwave treated as the object, were treated with the different microwave radiation intensities, treating time or moisture content(MC) before microwave treating, then vacuum and pressure impregnation in the treatment tank. It is discussed that the relationship between the conditions of microwave treating process and the permeability of dyed wood evaluated by the water absorption ratio(WAR) and the dye uptake. The result showed that the WAR and the dye uptake，the maximum at 30%（MC），increase with the decreasing of moisture content or increasing of microwave radiation intensities, treating time.

Key words: microwave treating, wood dyeing, water absorption ratio(WAR), dye uptake