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Control of Discoloration of Cedar Wood (Cryptomeria japonica) by Heat and UV Treatment  

Yoon, Kyung-Jin (Forest Sciences, Research Institute for Agriculture and Life Sciences, Seoul National Univ.)
Eom, Chang-Deuk (Forest Sciences, Research Institute for Agriculture and Life Sciences, Seoul National Univ.)
Park, Jun-Ho (Forest Sciences, Research Institute for Agriculture and Life Sciences, Seoul National Univ.)
Lee, Yang-Woo (Forestry Association of Seogwipo)
Choi, In-Gyu (Forest Sciences, Research Institute for Agriculture and Life Sciences, Seoul National Univ.)
Lee, Jun-Jae (Forest Sciences, Research Institute for Agriculture and Life Sciences, Seoul National Univ.)
Yeo, Hwanmyeong (Forest Sciences, Research Institute for Agriculture and Life Sciences, Seoul National Univ.)
Publication Information
Journal of the Korean Wood Science and Technology / v.36, no.6, 2008 , pp. 33-40 More about this Journal
Abstract
Normally, cedar heartwood has a red color. However, it frequently changes black color (blackening phenomenon). It is reported that blackening phenomenon of cedar has been caused by oxidation of phenolics and norlignan extractives under weak alkaline conditions. In this study, heat treatment and UV irradiation were carried out to reduce the difference of color value between blackened wood and bright sap wood. Effects of temperature, moisture content, treatment time and light on decrease of color difference between blackened heartwood and sapwood were evaluated in each treatment. A decrement of different color value between blackened heartwood and bright sapwood by hot-water treatment was bigger than others. An effect of the vacuum drying was similar to that of the kiln drying. UV irradiation decreases the color difference between dried blackened heartwood and bright sapwood. It is suggested that UV irradiation could be used as final treatment to reduce the color difference on wood during drying process. Determination of optimum conditions and development of hybrid process for control of discoloration will be needed in a further study.
Keywords
cedar; heal treatment; UV irradiation; discoloration;
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