Improving physical and mechanical properties in particleboard by recycled polyethylene and canola residues
2016
Rangavar, H. | Taghiyari, H. R. | Ghofrani, M. | Khojaste-Khosro, S.
Improving effects of recycled polyethylene on dimensional stability, mechanical properties, and reduction in adhesive consumption of particleboard made from canola residues were studied here. Canola residues were consumed at 0, 30, and 50 % consumption levels, based on the dry weight of wood particles. Recycled low-density polyethylene was also consumed at two levels of 20 and 30 %. Urea–formaldehyde resin was used for all treatments at three levels (6, 8, and 10 %). Results showed that polyethylene had significant improving effects on all the physical and mechanical properties. Increase in canola content, however, increased modulus of rupture and modulus of elasticity due to the more slenderness ratio of canola residue, but it decreased the internal bond and physical properties because of the higher specific surface area of canola particles. Properties of the panels made from 30 % canola residues, 30 % polyethylene, and 8 % urea– formaldehyde resin were in compliance with the EN 312-2 standards. It can be concluded that the improving effects of recycled polyethylene can compensate for part of the urea– formaldehyde resin, and therefore, lower urea–formaldehyde content can be used, lowering the production costs due to high-value urea–formaldehyde resin. At the same time, the potentiality of formaldehyde emission into the atmosphere would also be decreased.
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