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Improving the Properties of Fast-Growing Chinese Fir by Vacuum Hot Pressing Treatment

Lu Hong1, Biqing Shu1,2, Qian He1, Zehui Ju1, Haiyang Zhang1, Xiaoning Lu1,*

1 College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, 210037, China
2 College of Civil Engineering, Yangzhou Polytechnic Institute, Yangzhou, 225127, China
* Corresponding Author: Xiaoning Lu. Email:

Journal of Renewable Materials 2021, 9(1), 49-59.


Chinese fir was compressed by vacuum hot pressing and conventional hot pressing at different temperatures (180°C, 200°C and 220°C), respectively. The color parameters of the heat-compressed sample were measured, the relative mechanical properties of the material were tested and changes in the chemistry of fir were investigated using Fourier transform infrared spectroscopy (FTIR) and Xray photoelectron spectroscopy (XPS). The results indicated that the color difference between compressed and untreated wood increased gradually with the increase of temperature. Compared with the conventional hot pressing treatment, the color difference (ΔE*) of the Chinese fir treated by vacuum hot pressing decreased by 43.73%, 69.91%, and 77.17%, respectively. The mechanical properties (bending elastic modulus and bending strength) of Chinese fir treated by vacuum hot pressing were significantly improved. The 24-hour water absorption thickness expansion rate of fir treated by vacuum hot pressing is smaller than that of conventional hot pressing. It is implied that vacuum hot pressing treatment is an effective method to produce compressed wood, which can improve the mechanical properties and dimensional stability of wood, and reduce the influence of carbonization on wood color.


Cite This Article

Hong, L., Shu, B., He, Q., Ju, Z., Zhang, H. et al. (2021). Improving the Properties of Fast-Growing Chinese Fir by Vacuum Hot Pressing Treatment. Journal of Renewable Materials, 9(1), 49–59.


This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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