Leveraging Spruce Bark Particle Morphology for Enhanced Internal Bonding in Particleboard Production

Area of Science:

• Materials Science
• Forest Products
• Sustainable Materials

Background:

• Rising global demand for wood products necessitates exploring alternative resources like timber industry byproducts.
• Bark presents a promising, yet challenging, supplement for particleboard (PB) production due to its complex structure and properties.
• Current commercial-scale PB production faces limitations with bark integration.

Purpose of the Study:

• To investigate the potential of separately processing distinct bark constituents in a wet state for particleboard manufacturing.
• To evaluate the performance of particleboards made from mixtures of outer bark particles, bark fiber clumps, bark fibers, and wood particles.
• To determine the impact of tailored processing on bark material properties for optimized particleboard production.

Main Methods:

• Three bark-based raw materials (outer bark particles, bark fiber clumps, bark fibers) were processed separately in a wet state.
• Particleboards (PB) were produced using varying ratios of these bark materials and wood particles, with urea-formaldehyde adhesive.
• PB samples had a target density of 0.7 g/cm³ and thickness of 16 mm.

Main Results:

• Outer bark particles showed approximately 40% lower water absorption and thickness swelling compared to bark fibers.
• Bark fibers significantly improved internal bond strength by about 50% due to their morphology.
• Distinct properties of bark constituents were confirmed, highlighting potential for optimization via tailored processing.

Conclusions:

• Specialized wet processing of bark constituents offers a viable strategy for enhancing particleboard properties.
• Outer bark particles and bark fibers possess complementary characteristics beneficial for particleboard formulation.
• This approach paves the way for efficient utilization of bark as a sustainable resource in the wood products industry.