Wood Processing

Wood processing encompasses the sequence of operations by which raw timber is transformed into finished products for construction, furniture, composites and energy. It begins with the primary breakdown of standing stems into logs and sawn sections using band- and circular-saw technologies guided by formal grading rules that maximise value yield. Seasoning follows, reducing moisture to levels that match environmental conditions and thereby minimising distortion, surface checking and biological decay. Preservation treatments further protect timber against fungi, insects and fire. In parallel, the industry has advanced wood–polymer composites and bio-based adhesives, in which chemical modification of lignin, tannin or polysaccharides yields binders that meet mechanical standards while lowering volatile-organic emissions. Digitally enabled quality-control technologies have emerged across sawmills and panel plants, leveraging imaging, spectroscopy and machine learning for species identification, defect detection and process optimisation. Friction-based welding methods exploit thermomechanical softening of lignocellulosic polymers to join solid wood without adhesives, reducing chemical load and waste. Sustainability imperatives have instigated circular-economy approaches at every stage, from harnessing forestry residues in biorefineries to developing closed-loop adhesive systems and recyclable composites. This multidisciplinary evolution combines traditional craftsmanship, process engineering and digital innovation to fulfil environmental targets and performance demands at industrial scale.

Research from Nature Portfolio

Recent studies have demonstrated the direct use of uncondensed lignins isolated from lignocellulosic biomass as waterborne adhesives for plywood manufacture. Panels bonded with such lignin suspensions match the strength of phenol-formaldehyde resins across a broad temperature range, with mechanistic work showing that water plasticises lignin to enable vessel filling and in situ crosslinking with cell-wall phenolics. Foundational research on soybean-meal adhesives enhanced by catechol-inspired co-crosslinkers has further shown that natural polyphenol–protein networks can attain wet-bond strengths compliant with interior-grade plywood standards, highlighting the promise of biomimetic chemistry to replace synthetic binders under humid conditions.

Research from all publishers

An innovative visible-light-catalysed polyacrylic acid adhesive platform has been developed that integrates hydrogen bonding, electrostatic interactions and mechanical interlocking to achieve bond strengths above 20 MPa on wood and bamboo. The system remains stable from –196 °C to 200 °C, endures prolonged storage, and is fully recyclable through water-mediated dissociation. Separately, a self-adhesive plywood has been produced by delignifying and epoxidising rubber-tree bark veneer, then densifying to yield panels without added resin, combining hydrophobicity, wear resistance and low thermal conductivity. Advances in non-isocyanate polyurethane technology have employed lignin and tannin feedstocks to produce crosslinked resins that cure at low temperatures, shorten pressing times and eliminate toxic isocyanates, offering a sustainable route to high-performance wood adhesives.

Wood Processing publication trend

The graph below shows the total number of articles in wood processing across all publications each year (not limited to Nature Index journals).

Technical terms

Lignin: An abundant aromatic polymer in plant cell walls, used as a renewable phenolic source for adhesives.

Crosslinking: Covalent bonding between polymer chains that enhances cohesion and mechanical stability.

Catechol moiety: A dihydroxybenzene unit mimicking mussel adhesion, employed to improve wet-bond strength in bio-adhesives.

Polyacrylic acid: A water-soluble polymer whose carboxyl groups enable multiple noncovalent interactions and light-activated curing in adhesives.

Non-isocyanate polyurethane: A polyurethane analogue synthesised without toxic isocyanates, using cyclic carbonates or amines to react with polyols.

References

1. Bonding wood with uncondensed lignins as adhesives. Nature (2023).
2. The synergy between natural polyphenol-inspired catechol moieties and plant protein-derived bio-adhesive enhances the wet bonding strength. Scientific Reports (2017).
3. Light‐Driven PAA Adhesive: A Green Bonding Platform Integrating High‐Performance, Environmental Resilience, and Closed‐Loop Recyclability. Advanced Science (2025).
4. A self‐adhesive bark veneer for all‐natural plywood. EcoMat (2023).
5. Recent Developments in Lignin- and Tannin-Based Non-Isocyanate Polyurethane Resins for Wood Adhesives—A Review. Applied Sciences (2021).
6. Adhesiveless bonding of wood – A review with a focus on wood welding. BioResources (2021).
7. Introduction to Wood Technology and Basic Processes.