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The Improvement of the Permeability of Wood by Underwater Shock Wave
Itoh, Shigeru,Nagano, Shiro,Fujita, Masahiro,Takano, Tsutomu,Honda, Ryouzou,Ikeda, Motoyosi 대한금속재료학회(대한금속학회) 1998 METALS AND MATERIALS International Vol.4 No.4
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 traicheids closes faster near the heartwood in Sugi wand so that the internal moisture is not easily came out to the outside. At the mean time, it also makes very difficult ta saturate the rotten-proof chemicals into the dried Sugi wood to leave it become an additionally valuable wand. In this paper, we will develop an underwater shock wave technique to treat the pre-dried wood for the; improvement of the drying property as well as the permeability rind strength of Sugi wood by selectively fracturing the bordered pit membrane. The result indicates a very remarkable improvement c7n Che drying time. The. mechanism of the fracture of the bordered pit by underwater shock wave will be further studied ire the future.
Ozaki Yukiko,Alessandri Elena,Uenosono Satoshi,Takamiya Tsuguyuki,Shigeru Takano 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
We investigated the mechanism how the high green density can be provided during die lubricated warm compaction (WD). We observed and analyzed the densification processes of iron powders including different contents of an inner lubricant, and measured the lateral pressure at the die wall during WD in comparison with conventional compaction and warm compaction. As a result, the high density in WD was due to not only the particles-deformation enhanced by warming powders but also the particles-rearrangement promoted by reducing an amount of the inner lubricant rather than the die lubrication.