Particleboards from Recycled Wood

Abstract

The effective recovery of wood waste generated in wood processing and also at the end of wood product life is important from environmental and economic points of view. In a laboratory, 16 mm-thick three-layer urea–formaldehyde (UF)-bonded particleboards (PBs) were produced at 5.8 MPa and 240 °C and with an 8 s/mm pressing factor, using wood particles prepared from (1) fresh spruce wood (C), (2) a mixture of several recycled wood products (R1), and (3) recycled faulty PBs bonded with UF resin (R2). Particles from spruce wood were combined with particles from R1 or R2 recyclates in weight ratios of 100:0, 80:20, 50:50 and 0:100. In comparison to the control spruce PB, the PBs containing the R1 recyclate from old wood products were characterized by lower thickness swelling after 2 and 24 h (TS-2h and TS-24h), lower by 18 and 31%; water absorption after 2 and 24 h (WA-2h and WA-24h), lower by 33 and 28%; modulus of rupture in bending (MOR), lower by 28%; modulus of elasticity in bending (MOE), lower by 18%; internal bond (IB), lower by 33%; and resistance to decay determined by the mass loss under the action of the brown-rot fungus Coniophora puteana (Δm), lower by 32%. The PBs containing the R2 recyclate from faulty PBs were also characterized by a lower TS-2h and TS-24h, lower by 45% and 59%; WA-2h and WA-24h, lower by 61% and 51%; MOR, lower by 37%; MOE, lower by 17%; and IB, lower by 33%; however, their biological resistance to C. puteana was more effective, with a decreased Δm in the decay test, lower by 44%.

Eco-Friendly, High-Density Fiberboards Bonded with Urea-Formaldehyde and Ammonium Lignosulfonate

“…The growing need for sustainable products and the stringent legislative requirements related to the hazardous formaldehyde emissions from wood-based panels have boosted scientific and industrial interest in the production of eco-friendly, wood-based panels [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ] and optimal utilization of the available lignocellulosic materials [ 8 , 9 , 10 , 11 , 12 , 13 ].…”

Properties of High-Density Fiberboard Bonded with Urea–Formaldehyde Resin and Ammonium Lignosulfonate as a Bio-Based Additive

“…The production of medium-density fiberboard (MDF) and high-density fiberboard (HDF) panels, with a total global production of more than 105 million m 3 in 2019, is the second largest worldwide, preceded only by plywood manufacturing [ 3 ]. The transition to circular, low-carbon bioeconomy, growing environmental concerns, and strict legislation related to emission of harmful volatile organic compounds (VOCs), such as free formaldehyde from wood-based panels, have posed new requirements related to the development of environmentally friendly wood-based panels [ 4 , 5 , 6 , 7 , 8 , 9 ], optimization of lignocellulosic resources [ 10 , 11 , 12 , 13 ], and use of alternative raw materials [ 14 , 15 , 16 , 17 , 18 , 19 ].…”

Oversized Planer Shavings for the Core Layer of Lightweight Particleboard

“…Studies that included wood waste or residues for the production of particleboard have been carried out for more than three decades. Researchers investigated the properties of particleboards made from decayed wood and bark [ 26 ], pine needle litter [ 27 ], sunflower stalks [ 28 ], sunflower seed husks [ 29 ], almond shells [ 30 ], walnut and hazelnut shells [ 31 ], brewer’s spent grain [ 32 ], pruned branches [ 33 ] and wood chip wastes [ 34 , 35 ]. Rowell (2014) [ 6 , 24 ] analyzed the utilization of wood shavings waste ( Populus euroamericana and Eucalyptus grandis ) for the production of particleboards [ 1 ].…”