A research was conducted to discover the screw withdrawal resistance of moulded laminated veneer lumbers made from oil palm trunks (MLVOP). The MLVOPs were manufactured separately with three different veneer arrangements namely S100% (each ply came from the superior part), SS-CI (surface superior and core inferior) and S-I (alternate superior and inferior parts). The veneers were divided into two groups. One group of veneers was bonded with urea formaldehyde (UF) resin to MLVOPs and the other was bonded with phenol formaldehyde (PF). The veneers were pressed at a temperature of 110ºC for 20 min. The pressures applied to press the veneers to MLVOPs were 1500 psi, 2000 psi and 2500 psi. The study showed that the pressures and S-I veneer arrangement gave significant effects to the screw withdrawal resistance of UF-bonded and PF-bonded MLVOPs. MLVOPs with S-I veneer arrangement achieved the highest mean screw withdrawal resistance values when they were bonded with UF resin then pressed with 1500 psi and 2500 psi and bonded with PF resin and pressed with 1500 psi. The values were 848 N, 884 N and 496 N respectively. Overall, UF-bonded MLVOPs were better than those bonded with PF resin.
This research was undertaken to study the suitability of oil palm trunk to be utilized as a raw material for moulded laminated veneer oil palm (MLVOP). The trunks were converted into veneers by rotary peeling machine. The veneers were segregated into two veneer qualities namely superior (S) and inferior (I). The methods of segregating veneers quality were defined. The superior veneers were obtained by peeling the billets until their diameters left approximately 12 inches, meanwhile the inferior veneers were obtained by further peeling the same billets used for obtaining superior veneers until their diameters left 4 inches. The mean densities for superior veneer as well as inferior veneer were about 478.8 kg/m 3 and 385.1 kg/m 3 respectively. The mean moisture content of both superior and inferior veneers was approximately 11%. The veneers were arranged with 5 layers into three types of moulded shapes of furniture components namely i) 100% S ii) alternate S and I and iii) surface S & core I. The suitable pressure, temperature and time were set as important parameters. The arrangements of veneer quality were pressed using V-shape mould through hot press machine with three parameters pressure 1500 psi, 2000 psi and 2500 psi. Two types of adhesives namely UF and PF were used to produce MLVOP. The mechanical properties of the composites were tested with three bending types i.e. flat bending, type-V bending, and type-OV in accordance with BS EN 310:1993. The results showed that most of the samples bonded with UF-resin have better strengths (MOR and MOE) when tested with the three bending tests compared to the samples bonded with PF-resin. However, the results vary depends on the veneer arrangements.
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