PAPER making! g! FROM THE PUBLISHERS OF PAPER TECHNOLOGY INTERNATIONAL ® Volume 12, Number 1, 2026
secondary fibre types exhibited higher fines content, increased surface roughness, and elevated formaldehyde emissions relative to virgin fibres. FTIR spectroscopy and elemental nitrogen analysis, confirmed the presence of residual resin, which contributes to a higher pH and increased alkaline buffering capacity in secondary fibres. Dynamic vapour sorption (DVS) analysis revealed reduced water uptake and increased hysteresis in secondary fibres from steam treatment. Scanning electron microscopy (SEM) and inductively coupled plasma (ICP) analysis identified inorganic contaminants and elevated concentrations of elements— specifically sodium, aluminium, and lead, particularly in fibres from post-consumer fibreboard fractions. Finally, Fibre blends containing 15 % or 25 % (w/w) secondary fibres from fibreboard processing residues exhibited comparable properties to virgin fibre benchmarks. This study establishes a fundamental property baseline for secondary fibres, providing a framework for the formulation and optimization of future sustainable composites. “Material model of medium-density fibreboard for simulations of static and dynamic mechanical response”, Petr Zatloukal, Martin BrabecORCID Icon, Khaled Hassan, Hana Klímová & Jan Tippner, Wood Material Science & Engineering , Vol.21(1), 2026. Medium-density fibreboard (MDF) is one of many varieties of wood-based composites. The goal of this work was to build reliable, orthotropic elastic and elasto-plastic material models of MDF for finite element analysis (FEA). The models were validated by experimental modal analysis and three-point bending static testing. Four thicknesses of MDF were examined – 12, 18, 25 and 38 mm – and their vertical density profile (VDP) was measured to reveal their density distribution. Compression and shear tests were performed to determine elastic and plastic material parameters. The stereoscopic 3D-DIC method was used to determine the deformations during the static tests. The first bending frequency and damping were measured. The accuracy of the dynamic and static material models achieved 1.3–9.7% agreement with experimental modal analysis and 4.1–13.4% for the elasto-plastic response. The set of validated elasto-plastic material constants could be used for the further numerical study of MDF panels with thickness between 12 and 38mm. “Green multi-density fibreboards bound with mechanically processed wood nanofibers derived from industrial residues”, Yasser Amiri Moghaddam, Hossein Yousefi, Taghi Tabarsa, Mahdi Mashkour, Elmira Kaffashsaei & Armin Jamali, Wood Material Science & Engineering , published online 2026. The use of synthetic adhesives in wood composites such as fibreboard, poses health risks due to volatile organic compound emissions and creates waste challenges. This paper presents a sustainable alternative by valorizing industrial wood waste. Adhesive-free rejected wood particles (RWP) from a medium-density fibreboard production were mechanically processed into wood nanofiber (WNFs), which served as a natural binder. Panels at low (LDF), medium (MDF), and high (HDF) densities were manufactured with WNF additions of 2%, 5%, 10%, and 20% by weight. Characterisation of the WNFs confirmed it had an average diameter of 58 ± 15nm, but the crystallinity index was reduced and the chemical composition remained unchanged compared to RWP. LDF and MDF with 20% WNFs achieved a flexural strength of 18 and 36MPa, respectively. For HDF, optimal performance was achieved at 10% loading, yielding a bending strength of 47MPa, a modulus of elasticity of 2.65GPa, a hardness of 1.78kN, a water absorption of 20%, and a thickness swelling of 30%. Most of the panels complied the requirements described in the EN310 and EN317 standards. This method offers an eco- friendly pathway to reduce reliance on formaldehyde-based resins and repurpose industrial wood wastes. “Novel adaptive technology to process recycled wood for particleboard”, Sarah Ritter, Birger Bartuska, Ondrej Dvoracek, Stephan Frömel-Frybort, Boris Möseler &
Technical Abstracts
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