Author(s)

S. Itoh, S. Nagano & Z. Liu

Abstract

Sugi (Cryptomeria japonica D.Don) wood generally has the so-called black heartwood, which contains the extremely high moisture content. Although subjected to the drying process, it is difficult to be dried up completely so that Sugi wood does not have the sufficient strength for use. The reason is that during drying process, the bordered pit membrane on tracheids closes faster near the heartwood in Sugi wood so that the internal moisture is not easily come out to the outside. At the mean time, it also makes very dif- ficult to saturate the wood preservatives into the dried Sugi wood to have it become an additionally valuable wood. In this paper, we developed an underwater shock wave technique to treat the pre-dried wood for the im- provement of the

Keywords