Utilization of Eucalyptus wood in short rotation period in MDF production.
2009
Habibi, Mas`ud Reza | Hossein Khani, Hossein | Mahdavi, Sa`id | Kargar Fard, Abu Al-Fazl | Reza Nezhad, A`li | A`rab Tabar, Habib Ol-Lah
In this study, MDF was produced from Eucalyptus camaldulensis. Trees were 5 year old. The influence of three production variables (steaming time, press time and resin content) on MDF properties was investigated. Variations of each variable were as follow: - steaming time (5, 10, 15 minutes) - press time (4, 5 minutes) - resin content (9%, 11%) Fiber length and fiber diameter of Eucalyptus wood were measured 850, 16.23 micron respectively. Also mean values for the oven dry and basic density were determined 0.704, 0.59 gram per cubic centimeter respectively. MOR, MOE, IB, TS2, TS24 were determined according to EN standard. Increasing steaming time decreased boards' internal bond, bending properties and thickness swelling after 2 and 24 hours. The maximum of these properties were obtained in 5 minutes steaming time. Minimum of boards thickness swelling were obtained at 15 minutes steaming time because of fiber hydrophilic properties were decreased. As expected, boards demonstrated better properties at higher resin consumption. The effect of press time on physical and mechanical properties of boards was not significant. Production conditions of boards with 5 minutes steaming time, 11% resin content and 4 minutes press time showed more than EN standard related to mechanical properties. Meanwhile this condition did not provide standard value of thickness swelling of boards due to lack of wax using.
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