OSB panels made with wood species from the Brazilian Northeast's caatinga

This research study aimed to evaluate the feasibility of OSB (Oriented Strand Board) production using wood species from the Brazilian Northeast's Caatinga: marmeleiro (Croton sonderianusMuell. Arg.), jurema-branca (Piptadenia stipulacea (Benth.) Ducke) and catanduva (PiptadeniamoniliformisBenth.) and castor-oil polyurethane bicomponent resin. The properties investigated were: density; thickness swelling and water absorption (2 hours and 24 hours); modulus of elasticity and bending strength in the parallel and perpendicular directions; internal bond and resistance to screw withdrawal from the face, according to EN standards. The results of the analysis of the physical and mechanical properties showed the possibility of manufacturing OSB with the cited species in the laboratory, according to the mean values and the variability of properties equivalent to those panels produced on industrial scale, and compared to EN standard requirements for OSB/3 and OSB/4. Variance analysis showed that OSB panels containing catanduva wood strands yielded the best results in terms of mechanical properties, as for the physical properties, the best performances were those of panels made with the marmeleiro and jurema-branca species.

本研究旨在评估采用巴西东北部卡廷加植被区的三种木材树种制备定向刨花板（Oriented Strand Board，OSB）的可行性，所用胶黏剂为蓖麻油基双组分聚氨酯树脂，涉及的树种包括：桑德巴豆（Croton sonderianus Muell. Arg.）、白朱雷马豆（Piptadenia stipulacea (Benth.) Ducke）与单轴腺合欢（Piptadenia moniliformis Benth.）。
本研究考察的性能指标包括：密度、厚度膨胀率与吸水率（分别测试2小时与24小时工况）、平行与垂直方向的弹性模量及静曲强度、内结合强度以及板面螺钉拔出力，所有测试均符合欧盟标准（EN standards）要求。
物理与力学性能分析结果表明，采用上述树种在实验室环境下制备OSB板材具备可行性，其性能均值与性能波动幅度均达到工业规模化生产板材的水平，且各项性能均满足OSB/3与OSB/4的欧盟标准要求。
方差分析结果显示，添加单轴腺合欢木束的OSB板材在力学性能方面表现最优；而就物理性能而言，以桑德巴豆与白朱雷马豆为原料制备的板材性能最佳。