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Free drying shrinkage performance of Pinus sylvestris L. under different temperature and humidity conditions
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Free drying shrinkage performance of Pinus sylvestris L. under different temperature and humidity conditions
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Journal Article
Free drying shrinkage performance of Pinus sylvestris L. under different temperature and humidity conditions
2024
Overview
Efficient utilization of wood is inseparable from high-quality drying, and analysis of its free shrinkage performance is essential to optimize the drying process. This study took Pinus sylvestris L. sawn timber (500 mm×200 mm×50 mm) as the research object and adopted the image analysis method to analyze the influence rules of different temperatures and axial positions of the test material on the free dry shrinkage coefficient of each layer of specimens in the thickness direction. The free shrinkage coefficients of each layer in the thickness direction of the test material decreased from the maximum value of the first layer near the tangential direction (0.282%, 0.275%, 0.267%, at 60 °C, 80 °C, and 100 °C, respectively) to the minimum value of the ninth layer near the radial direction (0.248%, 0.249%, 0.227%); except for the near-radial layers, when temperature increased from 60 °C to 100 °C the free shrinkage coefficients of other representative layers decreased with increased temperature. The first layer’s free shrinkage coefficient decreased from 0.282% to 0.267%, and the fifth layer decreased from 0.264% to 0.243%. The difference of free shrinkage coefficients between corresponding layers at different axial positions of the test material was less than 0.017%, and the size stability of the corresponding layers at axial positions was high.
Publisher
North Carolina State University
