Journal
DRYING TECHNOLOGY
Volume 34, Issue 13, Pages 1613-1620Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/07373937.2016.1138964
Keywords
Drying; moisture gradient; near-infrared spectroscopy; red pine; shrinkage
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Funding
- Korea Forest Service [S111214L 100120]
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology [2014R1A6A3A01058852]
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This work focused on the shrinkage and drying stress of red pine (Pinus densiflora) wood during kiln drying and investigated transverse shrinkage and moisture changes in thin specimens using digital image analysis and near-infrared spectroscopy, respectively. The effect of specimen thickness, which ranged from 1 to 10mm on shrinkage, was analyzed under drying conditions with restrained stresses. The shrinkage due to moisture content was presented in the form of an exponential function and a linear function above and below the fiber saturation point, respectively. A shorter existence of the moisture gradient increased the transverse shrinkage. The tangential and radial shrinkage at the tissue level in 30-mu m (longitudinal) thick slices was measured and compared with the shrinkage of above specimens with difference thicknesses. The transverse shrinkage of 1-mm-thick specimen is similar to the shrinkage measured using 30-mu m-thick slice.
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