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- W2067954330 abstract "ABSTRACT A large diameter roundwood is an important element of Korean traditional buildings, Hanok, and is hard to be dried without surface cracks. Four different pretreatments, such as pre-cracking, oil heating, kerf-ing-oil heating and PEG impregnation, were investigated for reducing the surface cracks of large-diameter roundwood specimens during heat treatment. The roundwood specimens of pre-cracking, oil heating and kerfing-oil heating showed surface cracks during pretreatment, but that of PEG impregnation did not. It was confirmed that kerfing reduced the total crack width. Among the four pretreatments and control only the PEG impregnation roundwood specimen had no crack on both outer and inner surfaces after heat treatment. The PEG impregnation specimen shrank only 1.6% in the tangential direction while the pre-cracking did 8.0%. Keywords : Core-hollowed roundwood, pretreatment, heat treatment, oil heating, PEG impregnation, Kerfing, Tsuga heterophylla 1. INTRODUCTION Korean traditional buildings, Hanok, are most-ly constructed with large dimension lumbers and roundwoods. They are hardly kiln-dried without severe defects, thus usually air-dried from some months to an year. It was found that heat treat-ment above 160°C made the surface cracks of large diameter roundwoods closed (Kang, 2010).A heat-treatment apparatus was recently made in Korea and was used to develop color-change technology for domestic species, such as Korean red pine, Korean pine, and Larch (Kang, 2008). It was found that the device can be used for rapid drying large dimension timbers.Heat treatment reduces the growing stress of wood, increases the crystallinity of cellulose, decreases equilibrium moisture content, and im-proves the dimensional stability (Tejada et al., 1997). It has been reported that the crystallinity of wood heat-treated at high moisture content was increased as twice as that at oven-dry con" @default.
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- W2067954330 date "2012-09-25" @default.
- W2067954330 modified "2023-10-18" @default.
- W2067954330 title "Effect of Pretreatments on Reducing Surface Cracks of Heat-treated Western Hemlock Roundwoods" @default.
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- W2067954330 doi "https://doi.org/10.5658/wood.2012.40.5.343" @default.
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