Abstract
This work aimed to investigate the feasibility of using and mixing Toona ciliata, Eucalyptus urophylla/grandis and Pinus oocarpa woods in OSB production. Three one- species and four mixed-species combinations were compared. Layer structure varied by positioning different wood species in the surface and core of the panels. Phenol- formaldehyde (PF) adhesive was applied at 9% for all OSB panels. Three-layer mats with mass proportion of 25/50/25% for surface/core/surface were produced. Pressing time was 8 min, under a 4 MPa pressure and temperature of 180°C. Physical and mechanical properties were evaluated and compared to EN (300) commercialization standard. Most OSB panels did not fully attain such requirements. OSB panels made with Eucalyptus urophylla/grandis and Pinus oocarpa woods have potential to be commercialized as OSB/1 and OSB/2 types, respectively. Among panels made with T. ciliata wood, those produced with this species in the surface and Eucalyptus urophylla/grandis wood in the core met the requirements established for OSB/1 commercialization. Eucalyptus wood has great potential to substitute Pinus wood in OSB production. The utilization of T. ciliata wood for OSB production decreased mechanical performance, but remarkably enhanced water resistance properties.
Highlights
Oriented strand board (OSB) was introduced into the construction market in the early 1980s
Materials Raw materials used to manufacture OSB in this study were: (1) 18-year-old Pinus oocarpa wood obtained from an experimental plantation located at Lavras, Minas Gerais, Brazil; (2) 7-year-old Eucalyptus grandis/ urophylla hybrid clone wood, obtained from the Companhia Mineira de Metais located at Vazantes, Minas Gerais, Brazil, and (3) residual slabs from the primary processing of 18-year-old Toona ciliata var. australis obtained from a commercial plantation located at Marechal Floriano, Espírito Santo, Brazil
Wood basic density is the most important property to be considered in OSB production; it should range from 300 to 500 kgm-3 in order to result in panels with a high Compression ratio (CR), which is the ratio given by the mean apparent board density divided by the mean wood basic density (Maloney 1993)
Summary
Oriented strand board (OSB) was introduced into the construction market in the early 1980s. The OSB industry posted rapid growth and is well established across North America and Europe (Barbuta et al 2011). Along with Medium Density Fiberboard (MDF), OSB is slowly replacing the use of sawn wood for furniture and moulding in developed countries. In South America, Chile and Brazil are the main producers, where OSB is currently replacing more expensive plywood (EFORWOOD 2013, Okino et al 2004). The use of small-diameter, low quality logs as raw material for OSB production is the main advantage of this woodbased product (Barbuta et al 2011). In Brazil, the OSB industrial plant is located at Ponta Grossa in Paraná state (south region) with a capacity of 350000 m3year -1. Main applications in Brazil include I-beams, wood frame and steel frame systems, coatings, roofs and walls
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