Reinforced-Core Particleboard for Improved Screw-Holding Ability
Keywords:
Particleboard, OSB, strands, vertical density profile, mechanical properties, screw withdrawal resistanceAbstract
Applications of commodity particleboard are currently restricted by low screw-holding strength and low stiffness. Replacing the core particles with small strands that are used in the core of oriented strandboard (OSB) to produce a "particle-strand-particle" (PSP) hybrid can significantly improve particleboard strength properties. In this study, a set of particleboards was fabricated with standard core particles, randomly arranged OSB core strands, or aligned core strands to assess the effects of particle replacement with strands and their orientation in the core. PSP-random core board was similar to laboratory fabricated OSB with random core in properties such as density profiles, internal bond strength, and edge screw withdrawal resistance, but its strength properties were significantly improved compared with control particleboard. OSB and PSP boards had significantly higher thickness swelling typical of strand-based composites. Particleboard and PSP-oriented core had lower core density and higher surface density, whereas OSB and PSP-random core had higher core density and lower surface density. Core strand orientation methodology was problematic, but further optimization could potentially enhance the utility of M2- and M3-grade particleboard into more load-bearing applications.References
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