Preparation And Properties Of Binderless Particleboard Made From Oil Palm Trunk And Acacia Mangium
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Date
2015-04
Authors
WAN NADHARI, WAN NOOR AIDAWATI
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Abstract
Binderless particleboard were made from oil palm trunk and Acacia mangium particles. Before making the binderless particleboard, drying properties of the oil palm trunk and Acacia mangium blocks were studied in a laboratory scale by controlled relative humidity chamber under isothermal condition. The drying experiment of oil palm trunk and Acacia mangium were done by using selected temperatures with constant relative humidity (RH). The experimental data were then fitted to the Wang-Singh, Henderson-Pabis, Newton, Page, Midilli-Kucuk and Logarithmic mathematical drying model including one new proposed model. Next, the manufacturing optimum parameters of binderless particleboard were determined by using a respond surface methodology procedure (RSM) in the scope of central composite design (CCD) computer program. The mechanical and physical properties of the boards were evaluated based on Japanese Industrial Standards (JIS). Then, the mechanical and physical properties of hybrid binderless particleboard panels manufactured from selected ratios of oil palm trunk and Acacia mangium particles were evaluated by using the optimum manufacturing conditions. The mass attenuation coefficient of oil palm trunk and Acacia mangium binderless particleboard were studied by using single-beam photon transmission with effective energies of 16.59 keV, 17.46 keV, 21.21 keV, 22.20 keV and 25.26 keV. In this study, the drying properties of oil palm trunk and Acacia mangium were evaluated and one new mathematical drying kinetic model, MR = a exp (-ktn) + b was developed based on simplifying general series solution of Fick’s second law. The
drying rate for oil palm trunk to dry at 25, 30, 35 and 40 ºC were 0.030, 0.033, 0.055 and 0.063 per hour, respectively while the drying rate for Acacia mangium to dry at 30, 35,40, and 45 ºC were found to be 0.0269, 0.0303, 0.0350 and 0.0417 per hour, respectively. The optimum conditions for making the binderless particleboard was found to be steamed for 42 min with temperature 115˚C before they were compressed using a pressure of 12 MPa, at a temperature 200 ˚C for 19 min. The internal bond (IB) strength, the modulus of rupture (MOR), thickness swelling and water absorption at optimum manufacturing conditions were 0.40 MPa, 9.15 MPa, 11.51% and 26.98% respectively. The addition by percentage of Acacia mangium particles into oil palm trunk slightly increased the binderless particleboard dimensional stabilities. As a potential application in radiation dosimetry, the mass attenuation coefficient of (OPT:AM 70:30) binderless particleboards were close to the calculated XCOM values in water and theoretical young Breast 1 value as phantom material.
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Keywords
Preparation And Properties Of Binderless Particleboard , Made From Oil Palm Trunk And Acacia Mangium