The Possibility of Using Pine Bark Particles in the Chipboard Manufacturing Process

Area of Science:

• Materials Science
• Forestry
• Wood Science

Background:

• Sawmill operations generate significant by-products, primarily wood chips and bark.
• Currently, industrial applications for these by-products are limited, leading to potential waste.
• Bark possesses favorable properties and a rich chemical composition, making it a candidate for material development.

Purpose of the Study:

• To investigate the feasibility of utilizing sawmill by-products, specifically bark, in wood-based panel production.
• To evaluate the impact of varying wood chip to bark ratios on panel characteristics.
• To compare the properties of bark-containing panels against traditional wood chip and sawdust panels.

Main Methods:

• Wood-based panels were manufactured using different proportions of wood chips and bark (70:30, 60:40, 50:50).
• Reference panels were made from 100% wood chips and a mixture of wood chips and sawdust.
• Urea-formaldehyde adhesive with ammonium nitrate hardener was used as the binding agent.
• Panels were assessed for mechanical properties (modulus of elasticity, modulus of rupture, internal bonding), physical properties (density, thickness swelling, water absorption), and formaldehyde emission.

Main Results:

• Wood-based panels can be successfully produced from sawmill by-products without extensive pre-processing.
• Panels incorporating bark exhibited improved homogeneity, reduced formaldehyde emission, and lower water uptake compared to sawdust-containing panels.
• Specific mechanical and physical properties were evaluated across different wood chip-to-bark ratios.

Conclusions:

• Sawmill by-products, particularly bark, are viable raw materials for producing functional wood-based panels.
• Utilizing bark enhances panel quality, leading to better environmental performance (lower emissions, water absorption).
• This research supports sustainable practices by valorizing industrial wood waste into valuable wood products.