Evaluation of Drying and Anatomical Characteristic of Mongolian Oak Lumber by Kiln Drying due to storage time after sawing

Evaluation of Drying and Anatomical Characteristic of Mongolian Oak Lumber by Kiln Drying due to storage time after sawing: Poster presentation

Chang, Yoon-Seong (National Institute of Forest Science)
Kim, Min-Ji (National Institute of Forest Science)
Shin, Hyun-Kyeong (National Institute of Forest Science)
Han, Yeonjung (National Institute of Forest Science)

2019-08-27

Based on the 2017 statistics of the Korea Forest Service, the amount of annual production of domestic roundwood was 4.5 million ㎥. Twenty eight percent of the production was hardwood roundwood. About 80% of the hardwood was Quercus species. The hardwood roundwoods were mainly used for wood chips (50%) and medium density fiberboard (MDF)(26%). Only 6% of the hardwood roundwoods were used for sawn timber. Most of oak forests in Korea were not managed well. Therefore, diameter of oak trees was relatively small with lots of flaws, such as inside decay, discoloration etc., since many of them were reproduced by sprout forest. Oak trees produced from unmanaged forests are prone to drying defects. To overcome this proneness, drying and anatomical characteristic of Mongolian Oak (Quercus mongolica) lumber (thickness 30 ㎜ x width 100 ㎜ x length 1,900 ㎜) were investigated in this study. Shrinkage and color difference (E) due to kiln dry was measured. In order to evaluate drying defects, the degree of surface check was investigated. Warp of lumber, such as cup, bow, crook, and twist, were also measured after drying process. Tylosis formation between one month and six months after sawing was observed microscopically. In order to develop value-added products from domestic oaks, the yield rate from standing tree to the flooring board were calculated. It is expected that efficient production plan for the value added products from domestic oak species would be proposed based on the results of this study, which are not being used as commercial sawn timber in Korea currently.

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