Characterization of properties of oriented strand boards from beech and poplar

Akrami, Ali; Barbu, Marius Cătălin; Fruehwald, A.

doi:10.1007/s00107-014-0793-9

Cited by 26 publications

(22 citation statements)

References 5 publications

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“…However, according to other previous research, an increase in swelling should be expected with decrease in board density are anticipated (Maloney 1993). A decrease of TS and WA with increasing board density was observed also by Chen et al (2010) and by Akrami et al (2014a) in case of boards made of pure beech and those with core made of beech strands. This phenomenon is not common for all types of boards from the analysed groups.…”

Section: Dimensional Stabilitysupporting

confidence: 68%

“…Researchers have reported contradictory results concerning the TS relation with the board density. Normally, TS tends to increase with density (Wu and Piao 1999;Linville 2000;Wu and Lee 2002;Akrami 2014a). However, according to other previous research, an increase in swelling should be expected with decrease in board density are anticipated (Maloney 1993).…”

Section: Dimensional Stabilitymentioning

confidence: 91%

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

et al. 2014

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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.

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Section: Dimensional Stabilitysupporting

confidence: 68%

Section: Dimensional Stabilitymentioning

confidence: 91%

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

et al. 2014

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“…Different weight-saving techniques include using lightweight wood species such as poplar (Akrami et al 2014) or bamboo (Malanit et al 2010) or combining wood chips and agricultural fibers such as cotton (Güler et al 2001), sunflower stalks (Bektas et al 2005), kenaf (Kalaycıoğlu and Nemli 2006), and rice straw (Akyldiz et al 2015). Other options are increased resination (Monteiro et al 2016) and optimized board density profiles (Poppensieker and Thömen 2005;Lüdtke et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Improving Properties of Particleboards with Reduced Density

Lengyel¹,

Barbu

Câmpean

et al. 2018

BioResources

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The goal of this research was to examine factors affecting the feasibility of manufacturing particleboards at significantly lower density, while reducing the formaldehyde emissions. A further goal was to not significantly affect other important physical and mechanical properties of the boards, including swelling in thickness, surface absorption, bending strength, modulus of elasticity, internal bond, and surface soundness. By varying the raw material recipe (ratio between hardwood and softwood chips), it was found that increasing the amount of hardwood chips led to a significant decrease of the formaldehyde emissions, but also to a significant increase of the thickness swelling and surface absorption. The simple density reduction of particleboards was not a viable alternative because all properties were seriously affected. Therefore, the tests on particleboards with reduced density were repeated, but this time an isocyanate-based additive was added into the recipe at 0.25% and 0.4%. A noticeable improvement of all analyzed properties was achieved. Keywords: Particleboards with lower density and reduced formaldehyde emission; Influence on bending strength; Modulus of elasticity; Internal bondContact information: a:

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“…The surface strands are usually aligned in the length direction of the panel, thus giving the panel its primary strength along this axis (also referred to as the parallel direction or strong axis). However, the core layers are generally cross-aligned to the surface layer like plywood (Zhang et al 1998;Painter et al 2006;Akrami et al 2014). Zhou et al (1989) and Suzuki and Takeda (2000) reported that the mechanical performance of OSB determined in the parallel direction was higher than that of the values in other directions.…”

Section: Introductionmentioning

confidence: 99%

Stress-strain Constitutive Relation of OSB under Axial Loading: An Experimental Investigation

Chen¹,

He²

2017

BioResources

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The objective of this study was to establish the stress-strain empirical mode of oriented strand board (OSB) with random surfaces and oriented core 0° pattern (R/0°/R). The OSB specimens were loaded along the longitudinal (0°), diagonal (45°), and transverse (90°) directions of plates. The loading direction had a significant effect on the behavior of OSB. The OSB in compression exhibited high non-linear elastic behavior up to failure, while it expressed linear behavior when loaded in tension. Four types of failure modes under compression were included: end cracks between flakes, central cracks between flakes, diagonal shear failure, and surface folding. Most of the specimens in tension failed in tensile failure suddenly without plastic deformation. A refined empirical model was suggested and found to be in good agreement with the experimental data. The results provided useful information for modeling various structures containing OSB.

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Characterization of properties of oriented strand boards from beech and poplar

Cited by 26 publications

References 5 publications

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

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

Improving Properties of Particleboards with Reduced Density

Stress-strain Constitutive Relation of OSB under Axial Loading: An Experimental Investigation

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