Free shrinkage characteristics of Eucalyptus urophylla × E. grandis wood prone to collapse
Source abstract
Abstract
Abstract Free shrinkage is a natural characteristic of wood during drying, occurring when the moisture content (MC) drops below the fiber saturation point (FSP). However, achieving complete free shrinkage in practical processes is challenging due to drying stresses from varying rates between the surface and core layers. Eucalyptus wood is particularly prone to collapse above the FSP, complicating the free shrinkage process. This study investigates the free shrinkage characteristics of 2-mm thick Eucalyptus urophylla × E. grandis specimens, both sliced along the fiber direction and split tangentially (layered). The findings are as follows: Layered specimens exhibited significant shrinkage ratios (5.7–6.7 %) and equilibrium moisture content (EMC) values (19.0–22.7 %), which can be attributed to the differing anatomical structures across layers. In contrast, sliced specimens did not display a MC gradient during drying, but their shrinkage was somewhat constrained by adjacent layers. Consequently, layered specimens had fewer radial and tangential restrictions, allowing more pronounced unrestricted shrinkage. Also, the slight collapse in smaller sliced specimens had a negligible impact on free shrinkage. To achieve free shrinkage without collapse, it is essential to use small-sized specimens in both fiber and radial directions while maintaining low temperatures and high relative humidity (RH) conditions.
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Research context
OpenAlex topics: Wood Treatment and Properties · Tree Root and Stability Studies · Forest ecology and management
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
College of Furnishings and Industrial Design , 74584 Nanjing Forestry University , Nanjing 210037 , China
Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources , Nanjing Forestry University , Nanjing 210037 , China
References (39)
Show source-provided references
1. Akbari, A., Hill, R.J., and van de Ven, T.G.M. (2015). An elastocapillary model of wood-fibre collapse. Proc. R. Soc. A. 471: 20150184.10.1098/rspa.2015.0184 ↗
2. Almeida, G., Huber, F., and Perré, P. (2014). Free shrinkage of wood determined at the cellular level using an environmental scanning electron microscope. Maderas. Cienc. Tecnol. 16: 187–198.10.4067/S0718-221X2014005000015 ↗
3. Ananías, R.A., Sepúlveda-Villarroel, V., Pérez-Peña, N., Leandro-Zuñiga, L., Salvo-Sepúlveda, L., Salinas-Lira, C., Cloutier, A., and Elustondo, D.M. (2014). Collapse of Eucalyptus nitens wood after drying depending on the radial location within the stem. Dry. Technol. 32: 1699–1705, https://doi.org/10.1080/07373937.2014.924132.10.1080/07373937.2014.924132 ↗
4. Bariska, M. (1992). Collapse phenomena in eucalypts. Wood Sci. Technol. 26: 165–179, https://doi.org/10.1007/bf00224290.10.1007/BF00224290 ↗
5. Blakemore, P. (2011). Internal checking during eucalypt processing. In: Delamination in wood, wood products and wood-based composites. Springer, Netherlands, Dordrecht, pp. 237–254.10.1007/978-90-481-9550-3_12 ↗
6. Cao, M., Zhang, X., Ren, W., Zhu, J., Wang, H., Xu, H., and Yu, Y. (2021). Effect of drying methods on the cell wall pore structure of Phyllostachys edulis. J. For. Eng. 6: 58–65.
7. Chafe, S. (1985). The distribution and interrelationship of collapse, volumetric shrinkage, moisture content and density in trees of Eucalyptus regnans F. Muell. Wood Sci. Technol. 19: 329–345, https://doi.org/10.1007/bf00350810.10.1007/BF00350810 ↗
8. Chávez, C.A., Moraga, N.O., Salinas, C.H., Cabrales, R.C., and Ananías, R.A. (2021). Modeling unsteady heat and mass transfer with prediction of mechanical stresses in wood drying. Int. Commun. Heat Mass 123: 105230, https://doi.org/10.1016/j.icheatmasstransfer.2021.105230.10.1016/j.icheatmasstransfer.2021.105230 ↗
9. Chen, T. (2004). Study on preheating and rheological behavior of Eucalyptus camaldulensis lumber drying, PhD thesis. Nanjing Forestry University, Nanjing.
10. Chen, T. and Gu, L. (2006). Development of elastic strain and mechano-sorptive strain during conditioning of Eucalyptus camaldulensis lumber in batch kiln. Maderas. Cienc. Tecnol. 8: 49–56, https://doi.org/10.4067/s0718-221x2006000100006.10.4067/S0718-221X2006000100006 ↗
11. Chen, Y. and Zhu, J. (2019). Study on bending chracteristics of fast growing eucalyptus bookcase shelves by using burgers model. Wood Res. 64: 137–144.
12. Clarke, C., Palmer, B., and Gounden, D. (2008). Understanding and adding value to Eucalyptus fibre. South. For. 70: 169–174, https://doi.org/10.2989/south.for.2008.70.2.12.540.10.2989/SOUTH.FOR.2008.70.2.12.540 ↗
13. Dawson, B.S.W., Pearson, H., Kimberley, M.O., Davy, B., and Dickson, A.R. (2020). Effect of supercritical CO2 treatment and kiln drying on collapse in Eucalyptus nitens wood. Eur. J. Wood Prod. 78: 209–217, https://doi.org/10.1007/s00107-020-01500-5.10.1007/s00107-020-01500-5 ↗
14. Dlouhá, J., Alméras, T., Beauchêne, J., Clair, B., and Fournier, M. (2018). Biophysical dependences among functional wood traits. Funct. Ecol. 32: 2652–2665, https://doi.org/10.1111/1365-2435.13209.10.1111/1365-2435.13209 ↗
15. Fu, Z., Weng, X., Gao, Y., and Zhou, Y. (2021). Full-field tracking and analysis of shrinkage strain during moisture content loss in wood. Holzforschung 75: 436–443, https://doi.org/10.1515/hf-2020-0086.10.1515/hf-2020-0086 ↗
16. Fu, Z., Chen, J., Zhang, Y., Xi, e F., and Lu, Y. (2023). Review on wood deformation and cracking during moisture loss. Polymers 15: 3295, https://doi.org/10.3390/polym15153295.10.3390/polym15153295 ↗
17. Gao, Y., Fu, Z., Zhou, Y., Gao, X., Zhou, F., and Gao, H. (2022a). Moisture-related shrinkage behavior of wood at macroscale and cellular level. Polymers 14: 5045, https://doi.org/10.3390/polym14225045.10.3390/polym14225045 ↗
18. Gao, Y., Zhou, Y., and Fu, Z. (2022b). Interdependence of shrinkage behavior between wood macroscopic and cellular level during moisture content loss. Dry. Technol. 40: 3241–3248, https://doi.org/10.1080/07373937.2021.2017300.10.1080/07373937.2021.2017300 ↗
19. Hem, J. and Liu, S. (2021). Characteristics of plantation wood and its application in civil engineering. China For. Prod. Ind. 58: 110–112.
20. Innes, T. (1996). Pre-drying of collapse prone wood free of surface and internal checking. Holz als Roh-und Werkstoff 54: 195–199, https://doi.org/10.1007/s001070050165.10.1007/s001070050165 ↗
21. Lei, W., Zhang, Y., Ge, L., and Yu, W. (2022). Study on suitability manufacture process of structure Eucalyptus scrimber. J. For. Eng. 7: 46–52.
22. Li, L., Li, J., and Guo, H. (2022). Analysis on spatiotemporal pattern of China’s timber market. For. Grassl. Resour. Res. 78–85.
23. Patera, A., Derome, D., Griffa, M., and Carmeliet, J. (2013). Hysteresis in swelling and in sorption of wood tissue. J. Struct. Biol. 182: 226–234, https://doi.org/10.1016/j.jsb.2013.03.003.10.1016/j.jsb.2013.03.003 ↗
24. Perré, P. and Huber, F. (2007). Measurement of free shrinkage at the tissue level using an optical microscope with an immersion objective: results obtained for Douglas fir (Pseudotsuga menziesii) and spruce (Picea abies). Ann. Forest. Sci. 64: 255–265.10.1051/forest:2007003 ↗
25. Redman, A.L., Bailleres, H., and Perré, P. (2011). Characterization of viscoelastic, shrinkage and transverse anatomy properties of four Australian hardwood species. Wood Mater. Sci. Eng. 6: 95–104.10.1080/17480272.2010.535014 ↗
26. Redman, A.L., Bailleres, H., Turner, I., and Perré, P. (2016). Characterisation of wood–water relationships and transverse anatomy and their relationship to drying degrade. Wood Sci. Technol. 50: 739–757, https://doi.org/10.1007/s00226-016-0818-0.10.1007/s00226-016-0818-0 ↗
27. Rittiphet, C., Dumyang, K., Settapong, P., and Matan, N. (2022). A simple method to eliminate drying collapse of liquid-filled porous palm wood. Dry. Technol. 41: 89–106, https://doi.org/10.1080/07373937.2022.2086565.10.1080/07373937.2022.2086565 ↗
28. Teng, T., Zhou, Y., Meng, J., Chen, S., and Piao, C. (1998). Study on water movement during drying process of fast-growing plantation wood. Chinese J. Wood Sci. Technol. 2–6.
29. Tu, D., Chen, C., Zhou, Q., Ou, R., and Wang, X. (2021). Research progress of thermo-mechanical compression techniques for wood products. J. For. Eng. 6: 13–20.
30. Xu, Y. and Hou, L. (2023). Development on polyacrylonitrile-based carbon fiber reinforced structural eucalyptus laminated veneer lumber. J. For. Eng. 8: 59–65.
31. Yang, L. (2021). Effect of temperature and pressure of supercritical CO2 on dewatering, shrinkage and stresses of Eucalyptus wood. Appl. Sci. Basel. 11: 8730, https://doi.org/10.3390/app11188730.10.3390/app11188730 ↗
32. Yang, L. and Liu, H. (2018). A review of Eucalyptus wood collapse and its control during drying. BioResources 13: 2171–2181, https://doi.org/10.15376/biores.13.1.yang.10.15376/biores.13.1.Yang ↗
33. Yang, L. and Liu, H. (2021). Study of the collapse and recovery of Eucalyptus urophydis during conventional kiln drying. Eur. J. Wood Prod. 79: 129–137, https://doi.org/10.1007/s00107-020-01614-w.10.1007/s00107-020-01614-w ↗
34. Yang, L., Liu, H., Cai, Y., and Wu, Z. (2019). A novel method of studying the collapsed cell of Eucalyptus wood using X-ray CT scanning. Dry. Technol. 37: 1597–1604, https://doi.org/10.1080/07373937.2018.1519572.10.1080/07373937.2018.1519572 ↗
35. Yang, L., Zheng, J., and Huang, N. (2022). The characteristics of moisture and shrinkage of Eucalyptus urophylla × E. grandis wood during conventional drying. Materials 15: 3386, https://doi.org/10.3390/ma15093386.10.3390/ma15093386 ↗
36. Yin, Q. and Liu, H. (2011). Drying stress and strain of wood: a review. Appl. Sci. 11: 5023, https://doi.org/10.3390/app11115023.10.3390/app11115023 ↗
37. Zhang, X., Wang, X., Zhao, M., and Liu, H. (2024). Study on free shrinkage and rheological characteristics of Eucalyptus urophylla × E. grandis during conventional drying. Wood Mater. Sci. Eng. 1–7, https://doi.org/10.1080/17480272.2024.2311827.10.1080/17480272.2024.2311827 ↗
38. Zheng, J., Xu, X., and Yang, L. (2024). Dewatering characteristics of Juglans mandshurica wood using supercritical carbon dioxide: a comparison with conventional drying. Dry. Technol. 42: 926–935, https://doi.org/10.1080/07373937.2024.2324931.10.1080/07373937.2024.2324931 ↗
39. Zhu, X., Zhao, J., Gao, W., Qian, C., Duan, Y., Niu, S., and Cai, Y. (2021). Laws governing free and actual drying shrinkage of 50 mm thick Mongolian Scotch pine timber. Forests 12: 1500, https://doi.org/10.3390/f12111500.10.3390/f12111500 ↗