Lightweight particleboards for the furniture industry made of agricultural residues Part 3: Mechanical and physical properties of the particleboards
Pages: 5 - 11
Anja van de Flierdt,
One- and three-layer particleboards with densities varying from 200 kg/m3 to 650 kg/m3 are produced from hemp shives (Cannabis sativa) and stalks of sunflower (Helianthus annuus), topinambur (Helianthus tuberosus), maize (Zea mays) and miscanthus (Miscanthus sinensis gigantheus). The mechanical and physical properties of these boards are presented. Particleboards made from hemp shives, stalks of sunflower and topinambur and of low densities (400 kg/m3 to 500 kg/m3) were able to fulfill the minimum requirements for internal bond strength according to the EN 312 but could not achieve the adequate values of bending strength. Three-layer particleboards were made of topinambur stalks in the core layer and spruce particles in the surface layer, both bonded with UF-resin (12 % solid resin content). With a thickness of 19 mm and a density of 475 kg/m3 these particleboards have even higher values of internal bond strength as a 22 mm industrial standard particleboard made of wood chips with a density of 500 kg/m3 or as the innovative lightweight boards made with expanded polystyrene in the core layer and a density between 430 kg/m3 to 460 kg/m3. The bending strength of
these three-layer boards produced in the laboratory matches those of lightweight standard industrial particleboards. For a comparison between boards produced in the laboratory and in the industry, the different conditions of production have to be considered.