Morphology, physical, and mechanical properties of particleboard made from rape straw and wood particles glued with urea-formaldehyde resin

Abstract

The morphology, physical, and mechanical properties were investigated for single-layer particleboard made with various proportional contents of wood and rape stalk particles glued with urea-formaldehyde resin. Fine crushed rape stalk particles were used for the experimental particleboards. The weight ratios of rape-to-wood particles were 0:100, 10:90, 30:70, 50:50, and 70:30. Mixed beech and spruce wood particles with percentages of 30% for beech wood and 70% for spruce wood were considered for the configuration. Urea-formaldehyde resin with a solid content of 66 ± 1% was added to the single-mat configuration at a level of 12%, based on the weight of the particles. Physical (density, water absorption, and thickness swelling) and mechanical (modulus of elasticity, bending strength, internal bond strength) investigations on the particleboards obtained in the laboratory conditions were conducted. The results were compared to the requirements of the EN 312 (2004) standard. In addition, morphological observation at macro- and micro-scale and vertical density profile analysis was conducted on particleboards in order to characterize the interaction between wood-rape particles and resin. Variations of the structure and density were observed relative to thickness, providing information concerning to the internal bond performance of the panels.

Review on the influencing factors towards improving properties of composite insulation panel made of natural waste fibers for building application

“…141 Last but not least, it should be noted that the higher compression effect is not only limited by the implementation of low-density fiber with bulky structure but according to a research work by Benthien et al 142 higher compression effect could also be achieved by increasing the compression resistance in the middle part of the composite panel. To achieve this condition, previous research suggested that a few parameters might be applied and implemented in composite panels, such as raising the fiber ratio of fine fiber particle, 143 utilizing a high density fiber, 131 increasing the amount of resin in fiber 144 and reducing the moisture content of fiber.…”