The Influence of Speed and Press Factor on Oriented Strand Board Performance in Continuous Press

Abstract

a Three-layer cross-oriented strand boards, OSB type 3 of 10 mm thick, were industrially manufactured from a mixture of wood species including 50% softwoods, 25% beech, and 25% low hardwoods, using a continuous press line. The effects of line speed and press factor on physical and mechanical properties of OSB/3 (exterior grade) were evaluated, keeping nearly constant the face-core adhesive ratio. The manufactured boards were classified into five groups depending on the pressing parameters. The experimental results showed that all mechanical properties increased, with increasing press factor and decreasing line speed. The ratios of bending strength (MOR) and the modulus of elasticity (MOE) parallel to perpendicular were 1.73 to 1.89 and 2.18 to 2.24, respectively. No significant differences in thickness swell and water absorption were observed. The lowest density was achieved at higher speed, although there was no large variation in densities between groups. Thickness swelling and internal bond after boil test exceeded the EN 300 standard requirements for OSB/3 moisture resistance, excepting a few boards. The results revealed that a correlation between speed and press factor is necessary in order to improve mechanical properties and to keep the physical performance of boards within a limited range of values.

Effect of Bamboo Species and Resin Content on Properties of Oriented Strand Board Prepared from Steam-treated Bamboo Strands

“…Penetration of resin reduces the diameters of the capillaries or the total void age, which results in a reduced water uptake. Water uptakes in these OSBs were almost equivalent to those reported for OSBs from softwood and hardwood (Zhang et al 2007;Febrianto et al 2009;Gündüz et al 2011;Ciobanu et al 2014). The values of TS obtained in this experiment did not exceed the OSB minimum property requirement according to the CSA O437.0 (grade O-1) standard.…”

Some Physico-mechanical Characteristics of Uncoated OSB ECO-products Made from Scots Pine (Pinus sylvestris L.) and Bonded with pMDI Resin

“…3B). For OSB/3 bonded with pMDI, these results were in agreement with those from Hrázský and Král (2009) Also the present results are consistent with those of Ciobanu et al (2014), who found that the MOR ranged from 22.8 N/mm 2 to 26.8 N/mm 2 and from 12.1 N/mm 2 to 15.4 N/mm 2 parallel and perpendicular to the length axes, respectively, for the OSB/3 board made from a mixture of strands. For the same boards, the MOE ranged from 3934 N/mm 2 to 4769 N/mm 2 and from 1667 N/mm 2 to 2186 N/mm 2 parallel and perpendicular to the length axes, respectively.…”

“…2B). The lower values of the MOR and MOE were found in the perpendicular direction, which is the minor axis (Ciobanu et al 2014). The average MOE values of OSB/3 ranged from 4515.4 N/mm 2 to 4795.6 N/mm 2 (=, Fig.…”

“…However, in wet conditions, the IB values were 0.16 N/mm 2 and 0.24 N/mm 2 for the commercial and red maple OSBs, respectively, for boards with thicknesses of 0.025 inches, 0.035 inches, and 0.045 inches. The IB ranged from 0.39 N/mm 2 to 0.43 N/mm 2 and decreased to the range of 0.13 N/mm 2 to 0.18 N/mm 2 after the boil test for boards with 10 mm thick (Ciobanu et al 2014 (Mendes et al 2013). Also, the values of the IB, MOR (parallel), and MOE (parallel) were 0.495 MPa to 0.950 MPa, 69 MPa to 72 MPa, and 8135 MPa to 9050 MPa, respectively, for aspen/birch OSB-Ponderosa pine OSB bonded with PVA type I with thickness of 12 mm (Barbuta et al 2012).…”

“…The resin pMDI has been used extensively to manufacture OSB panels from aspen strands with a mixed PF and pMDI resin system (Brochmann et al 2004), rubberwood (Malanit and Laemsak 2007), red maple (Paredes et al 2008), a mixture of heartwood cypress (Cupressus sempervirens) and pine (Pinus sylvestris) (Makowski and Ohlmeyer 2005;Amusant et al 2009;Hrázský and Král 2009;Böhm et al 2011), bamboo strands (Sumardi and Suzuki 2014), and mixtures of strands (Ciobanu et al 2014).…”