Many of conifers including Beimatsu (Pseudotsuga menziesii Franco; Dougras fir, Oregon pine), Akamatsu (Pinus densiflora Sieb. et Zucc.; Japanese red pine), Dafurica Karamatsu (Larix gmelinii Gordon; Dahurica larch) and Karamatsu (Larix leptolepis GORDON; Japanese larch) generally contains the high moisture content. Although subjected to the drying process, it is difficult to be dried up completely so that a long time is necessary for conifers to be used as an architectural material. The bordered pit membrane on tracheids closes in the heartwood of conifers. For this reason, internal moisture is not able to go outside easily. And it makes difficult to saturate the wood preservatives to purpose of production of high value-added wood. In this paper, we developed an underwater shock wave technique to treat the pre-dried wood for the improvement the penetration of wood as well as be drying property by selectively fracturing the bordered pit membrane. The result indicates a very remarkable improvement on the penetration.

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