Drvna industrija, Vol. 74 No. 4, 2023.
Original scientific paper
https://doi.org/10.5552/drvind.2023.0125
Thermal Modification Intensity of Heat-treated Poplar Wood Part 1: Characterization and Predication of Surface Layer
Yang Li
; Anhui Agricultural University (AAU), Hefei, China
Tao Yao
; Anhui Agricultural University (AAU), Hefei, China
Yong Zhu
; Anhui Agricultural University (AAU), Hefei, China
Zuju Shu
; Anhui Agricultural University (AAU), Hefei, China
Shengquan Liu
; Key Lab of State Forest and Grassland Administration on “Wood Quality Improvement & High Efficient Utilization”, School of Forestry & Landscape Architecture, Anhui Agricultural University, Hefei 230036,China., Hefei, China
Redžo Hasanagić
; University of Bihać, Bihać, Bosnia and Herzegovina
Fathi Leila
; Shahrekord Universit, Shahrekord, Iran
Demiao Chu
; Anhui Agricultural University (AAU), Hefei, China
Abstract
Wood heat treatment is an environmentally friendly method, and the heat-treated wood properties are closely related to thermal modification intensity. This study focuses on the 0-3 mm surface layer (SL) of poplar wood heat treated at 160~220 °C. The modification intensity, including surface color, hardness, chemical component and morphological changes of the SL, was evaluated. The findings of this research showed that the color difference of the poplar wood before and after heat treatment (ΔE*1) increased; the color difference between up-surface and down-surface of the SL (ΔE*2) also increased with the treatment temperature. Consequently, the surface hardness (HR) decreased with the increase of treatment intensity. When the treatment temperature was higher than 160 °C, the up-surface and down-surface of the SL were statistically different in color. Chemical component analysis revealed that the heat treatment degrades wood components, especially the hemicellulose, and correlation analysis showed a significant correlation between the change rate of hemicellulose and the ΔE*1 or HR value; the prediction functions have been established at a high confidence level of 0.99. Overall, the thermal modification intensity of the heat-treated surface layer (SL) of poplar wood varies, and the HR and ΔE*1 value could be used to characterize and predict the modification intensity and degree of thermal degradation of the surface layer of heat-treated poplar wood.
Keywords
heat treatment; modification intensity; hardness; color; poplar wood
Hrčak ID:
311421
URI
Publication date:
15.12.2023.
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