Effect of press conditions on physical and mechanical properties of hydro thermo- mechanical treated poplar wood | ||
| تحقیقات علوم چوب و کاغذ ایران | ||
| Article 6, Volume 36, Issue 3 - Serial Number 76, August 2021, Pages 218-230 PDF (612.44 K) | ||
| Document Type: Research Paper | ||
| DOI: 10.22092/ijwpr.2021.352727.1651 | ||
| Author | ||
| Reza Hajihassani* | ||
| PhD, Wood and forest products division, Research Institute of Forests and Rangelands, Agricultural Research Education and Extension Organization (AREEO), Tehran, Iran | ||
| Abstract | ||
| The aim of current research was to investigate the effect of hydro thermo-mechanical treatment and also press conditions on the physical and mechanical properties of poplar wood (Populus deltoides). The wood blocks were initially treated hydrothermally at temperatures of 100°C for holding time of 0, 60, 120 minutes. Afterwards, the densification process was carried out under a hot press at two phases 1- contact and 2- compression press, for temperature of 160, 180 and 200°C for 60 and 90 minutes. The wood compression set was adjusted for 40 percent based on the thickness (radial direction) of the blocks. The samples were physically and mechanically tested as density, springback after press, water absorption, thickness swelling, bending strength and modulus of elasticity. Afterward, the results were analyzed based on a complete randomized design (CRD) under a factorial experiment. Results revealed that physical and mechanical properties of samples were enhanced due to the combined hydro thermo-mechanical treatment. Results revealed that this process causes reduction of springback, water absorption and thickness (radial direction) swelling and also improvement of mechanical properties such as bending strength and modulus of elasticity. | ||
| Keywords | ||
| Poplar; Hydro Thermo-Mechanical Treatment; Compression; Physical and Mechanical Properties | ||
| References | ||
|
-American Society for Testing of Materials, ASTM D 143-09, 2014. Standard Methods of Testing Small Clear Specimens of Timber.
-Anshari, B., Guan, Z.W., Kitamori, A., Jung, K., Hassel, I., Komatsu, K., 2011. Mechanical and Moisture-Dependent Swelling Properties of Compressed Japanese Cedar, Construction and Building Materials, 25: 1718–1725.
-Bekhta, P., Hiziroglu, S., Shepelyuk, O., 2009. Properties of Plywood Manufactured from Compressed Veneer as Building Material, Materials and Design, 30: 947–953.
-Dioufa, P.N., Stevanovicb, T., Cloutierb, A., Fangb, C.H., Blanchetc, P., Koubaad, A., Mariottib, N., 2011. Effects of Thermo-Hygro-Mechanical Densification on the Surface Characteristics of Trembling Aspen and Hybrid Poplar Wood Veneers, Applied Surface Science, 257: 3558–3564.
-Gong, M., Lamason, C., Li, L., 2010. Interactive Effect of Surface Densification and Post-Heat- Treatment on Aspen Wood, Journal of Materials Processing Technology, 210: 293–296.
-Hajihassani, R., 2017. Evaluation of Physical and Mechanical Properties of Glulam Made from Treated Poplar Wood by Combined Hygro Thermo-Mechanical Modification. Dissertation thesis, Tarbiat Modares University.
-Hakkou, M., Pétrissans, M., Zoulalian, A., Gérardin, P., 2005. Investigation of Wood Wettability Changes During Heat Treatment on the Basis of Chemical Analysis, Polymer Degradation and Stability, 89: 1-5.
-Lam, P.S., Lam, P.Y., Sokhansanj, Sh., Bi, X.T., Lim, C.J., 2013. Mechanical and Compositional Characteristics of Steam-Treated Douglas Fir (Pseudotsuga menziesii L.) During Pelletization, Biomass and Bioenergy, 56: 116-126.
-Mohebby, B., Sharifnia-Dizboni, H., Kazemi-Najafi, S., 2009. Combined Hydro-Thermo-Mechanical Modification (CHTM) as an Innovation in Mechanical Wood Modification, In: Proceeding of 4th European Conference on Wood Modification (ECWM4), Stockholm, Sweden, 353-360.
-Saari, N., Hashim, R., Sulaiman, O., Hiziroglu, S., Sato, M., Sugimoto, T., 2014. Properties of Steam Treated Binderless Particleboard Made from Oil Palm Trunks, Composites: Part B, 56: 344–349.
-Welzbacher, C.R., Wehsener, J., Rapp, A.O., Haller, P., 2008. Thermo-Mechanical Densification Combined with Thermal Modification of Norway Spruce (Picea abies Karst) in Industrial Scale-Dimensional Stability and Durability Aspects, Holz Roh Werkst, 66: 39–49.
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